35results about How to "Increase radius of gyration" patented technology

A method and device for testing the magnetized viscosity of a magnetic liquid, using a permanent magnetic ring as a magnetic source, the confinement magnetic field is continuously adjustable from weak to strong, and is formed by a permanent magnetic ring surrounded by an inner magnetically conductive stator, an outer magnetically conductive stator, and a magnetically conductive rotor The cavity moves up and down, so that two radially adjustable gaps are formed between the upper pole shoe ring, the magnetically permeable rotor and the inner magnetically permeable stator, forming a magnetizing circuit and a magnetic flux leakage circuit, and then adjusting the force applied to the magnetic liquid material. Magnetic field strength, after starting the speed regulating motor, the magnetic liquid material is sheared through the rotation of the magnetically conductive rotor, and the viscosity characteristic is converted into shear force and measured by the torque testing device in the form of torque M; the magnetic flux is measured by the magnetic flux measuring device, and finally press The formula calculates the magnetization viscosity and flux density. The weak magnetic field of the present invention can be adjusted to a level close to zero, and the rotor that shears the magnetic liquid has a small inertia, a large radius of gyration, and is easy to adjust, and is more suitable for the viscosity-temperature curve of the magnetic liquid under low temperature and weak magnetic field and Measurement of magnetic viscosity curve.

The invention provides a position and attitude detection device and a position and attitude detection method for an omnidirectional mobile platform, including an omnidirectional wheel, a transmission shaft, an encoder, a bearing, a coupling, an omnidirectional wheel seat, a connecting rod, a pin shaft, and a steering rod , top plate, lead screw, linear guide, slider, hand grip, stepper motor, main control board, steering rod, connecting rod and omnidirectional wheel seat form a two-degree-of-freedom suspension system, and the omnidirectional wheel seat can wrap around the connecting rod Free rotation, the connection between the connecting rod and the omnidirectional wheel seat is a tight fit, the connecting rod is equipped with a bearing, the connecting rod can freely rotate around the steering rod, and the connection between the connecting rod and the steering rod is a tight fit, ensuring that the connecting rod and the steering rod have no shaft There is a bearing in the connecting rod to ensure the relative smooth sliding of the connecting rod and the omnidirectional wheel base. When the uneven ground causes the support reference plane of the mobile platform to be inconsistent with the support reference plane of the omnidirectional wheel of the pose detection device , Through the adjustment of the two-degree-of-freedom suspension mechanism, the full and non-slip contact between the omnidirectional wheel and the ground can be ensured.

The invention discloses an aircraft supercharging device, and belongs to the technical field of aircrafts. The device comprises an upper cover, an impeller, a machine base and an air storage pipe; theupper cover and the machine base are fixedly connected to form an axisymmetric annular space, the impeller is positioned between the upper cover and the machine base, the blades of the impeller are positioned in the annular space, and the annular space which is larger than the maximum radius of the blades forms an air collecting cavity. Four hollow pipes with oval section are fixedly connected with the machine base and communicate with the air collecting cavity to form the air storage pipe. When the impeller rotates at a high speed, airflow is sucked from the central part of the impeller, andis accelerated by the blades and then enters the air collecting cavity and continues to flow along the circumference, under the action of a side guide plate and a rear guide plate, the air flow enters the air storage pipe to be subjected to speed reduction and supercharging. The supercharging device adopts an impeller with axially symmetric blades, an air flue with gradually reduced cross sectional area and the annular air collecting cavity, and is characterized by low airflow loss, high working efficiency; and the air flow can be automatically distributed according to the working load of theair storage pipe, and the requirement for the attitude control of the combined wing aircraft is met.

The invention discloses an anti-buckling support with circumferential prestressing, a method and application. The anti-buckling support comprises a support core material, an inner sleeve and an outer sleeve, wherein a steel pipe is used as the core material; the inner sleeve is used for supplying circumferential prestressing to the core material and is arranged in the support core material; the outer sleeve is used for improving the local stable bearing capacity and overall stable bearing capacity of the support core material and is arranged outside the support core material; and a friction reducing layer is respectively arranged between the support core material and the inner sleeve as well as between the support core material and the outer sleeve so as to reduce the limit of the inner and outer sleeves to axial deformation of the core material. According to the anti-buckling support, the self weight of the support is small, and although the cross section of the structure is composed of three layers of steel pipes, the combined section is still a hollow section; compared with a solid section, the component weight is greatly reduced, and the hysteretic behavior is good; the support core material, the outer sleeve and the inner sleeve are made of uniform steel products, so that the strength is high, the durability is good, and the hysteretic behavior is good; and the circumferential prestressing is applied to the core material so as to reduce the axial bearing capacity of the core material, so that the core material is easier and faster to yield, the shock resistance is improved, and the energy consumption is reduced.

The embodiment of the invention discloses a multi-stage hydraulic multiplying pulley vertical lifting platform fire truck, which belongs to the technical field of fire fighting and rescue equipment, and includes a car chassis, the tail of the car chassis is hingedly equipped with a telescopic arm, and the top end of the telescopic arm is A slewing platform is provided, and a working arm is installed on the slewing platform, and a working bucket is installed on a section of the working arm; Front hydraulic outriggers are installed on the left and right sides, and rear hydraulic outriggers are installed on the left and right sides of the telescopic arm away from the cab of the car. The chassis of the car is provided with an auxiliary support oil cylinder. Each is equipped with a transitional hydraulic cylinder. The invention solves the technical problems that the maximum rescue radius of the existing high-altitude fire truck is small, and the maximum rescue height is greatly limited by the transmission form of the hydraulic oil cylinder, and is widely used in high-altitude fire fighting or rescue.

The invention relates to a buckling-restrained brace arranged in a cross mode, a building with the buckling-restrained brace and application. The buckling-restrained brace arranged in the cross mode mainly comprises a first stress component and a second stress component. The first stress component and the second stress component are each provided with a stress main pipe. The middle section of each stress main pipe is provided with a protruding part. The inner side of the protruding part of each stress main pipe is fixedly connected with an inner restraining casing pipe, and the outer side of the protruding part of each stress main pipe is fixedly connected with an outer restraining casing pipe. The protruding parts of the two stress main pipes are fixedly connected to form an X-shaped structure. According to the buckling-restrained brace arranged in the cross mode, the building with the buckling-restrained brace and the application, the cross-sectional area and the length of the protruding parts of the stress main pipes can be adjusted, the ratio of the strength to the stiffness of the bracing components is changed conveniently, and structure optimization is achieved.

The invention provides a ballast cleaning machine, which comprises a ballast cleaning machine body, wherein a rotating and conveying mechanism as well as a tensioning and elevating mechanism are arranged on the ballast cleaning machine body; the tensioning and elevating mechanism is used for tensioning and elevating the rotating and conveying; one end of the tensioning and elevating mechanism is connected with the ballast cleaning machine body; and the other end of the tensioning and elevating mechanism is connected with the rotating and conveying. The ballast cleaning machine provided by the invention has the advantages as follows: through the adoption of the tensioning and elevating mechanism, the lengthened rotating and conveying mechanism can obtain stability during rotating and unloading contaminated soil, so that the rotation radius of the rotating and conveying mechanism can be increased by using a method for lengthening the rotating and conveying mechanism so as to increase the throwing distance and throwing range of the contaminated soil and increase the discharging efficiency of the contaminated soil.