49results about How to "Small change in angle" patented technology

An objective lens for an endoscope, including a negative front lens group and a positive rear lens group arranged such that an aperture stop is positioned therebetween, wherein the front lens group has at least a front-side negative lens and a front-side positive lens arranged in this order from an object side, and the rear lens group has at least a rear-side positive lens and a cemented lens arranged in this order from the object side, the cemented lens being configured by cementing together negative and positive lenses. The objective lens satisfies following conditions: −4.5≦f_F/f≦−2.0 and 1.5≦f_RP/f≦2.5, where f_F (unit: mm) represent of the front lens group, f (unit: mm) represents a total focal length of the front lens group and the rear lens group, and f_RP (unit: mm) represents a focal length of the rear-side positive lens.

The invention relates to an aircraft and provides an unmanned aerial vehicle based on coaxial multi-rotor-wing posture adjustment so as to solve the problems that an existing single-propeller aircraft is poor in reliability and large in power loss, a multi-axis aircraft is large in weight and poor in carrying capacity, and a coaxial double-rotor-wing aircraft is large in weight and poor in maneuvering performance. The unmanned aerial vehicle based on coaxial multi-rotor-wing posture adjustment comprises a vehicle core, an aircraft frame and a deflection adjusting mechanism; the vehicle core comprises a double-output driving mechanism, a frame and a coaxial multi-rotor-wing mechanism; and the double-output driving mechanism is mounted on the frame, the coaxial multi-rotor-wing mechanism is connected to the two output ends of the double-output driving mechanism, counter rotating propellers are arranged on the coaxial multi-rotor-wing mechanism, a deflection manipulating rod is connected to the bottom of the frame, and the deflection adjusting mechanism is mounted on the aircraft frame and can control the deflection manipulating rod to swing. The unmanned aerial vehicle based on coaxial multi-rotor-wing posture adjustment can be used for aerial photography, agricultural spraying and unmanned probe.

The invention discloses a path generation method and device. The method comprises the following steps: a trajectory initial edge and a trajectory stop point are obtained; a trajectory is searched fromthe trajectory initial edge to determine multiple trajectory paths from the trajectory initial edge and the trajectory stop point; multiple trajectory edges needing to be passed through are inquiredin each trajectory path; trajectory tangential quantities between every two adjacent trajectory edges in the multiple trajectory paths are calculated to determine the trajectory path with the lowest change value of the trajectory tangential quantities; and the trajectory path is determined as a target trajectory path. The method solves the technical problem of shortening of the equipment service life due to sudden change of equipment joint changes caused by no consideration of turning angles of all the trajectory edges in the trajectory paths during generating of the trajectories by a robot inrelated technologies.

An idle stroke non-interference trajectory planning method for multi-spindle-head machining comprises the following steps of establishing a kinematic model of a multi-spindle-head machine tool, subjecting a workpiece to blocking treatment, and subjecting a tool to point centralization treatment; generating a cutter location point track of the planning cutter based on an edge intersection point method, and taking relative position parameters of the planning cutter and the workpiece at the head and tail end points of the track and the edge intersection point as adjusting parameters of a cutterlocation point path; describing the tracks of the two rotating shafts and the tail end track along any coordinate axis in the joint space by adopting a quintic spline curve, and describing unknown quantities in a description equation by using parameters related to edge intersection points and position parameters at beginning and tail end points; establishing a multi-target fitness function about the idle stroke by using a weighting coefficient method, detecting interference by using a two-stage intersection detection algorithm, and if the interference exists, determining that the fitness valueis 0; and performing iterative optimization by adopting a genetic algorithm. According to the method provided by the invention, a flexible idle stroke track which is free of interference, relativelyshort in motion time, relatively small in rotating shaft angle variation and shortest in tail end track can be planned.

The invention discloses a plastic bracket structure of a motor with a replaceable carbon brush, belonging to the technical field of motor parts and comprising two fully symmetrical external small cavities, wherein a plastic column, a brush box, a carbon brush spring, a carbon brush assembly and a terminal assembly are arranged in the small cavities; the carbon brush spring is located on the plastic column; the carbon brush assembly comprises a carbon brush, a brush cord and an insertion spring, and the tail part of the brush cord is fixedly connected with the insertion spring; the terminal assembly comprises a brush box bottom board, a plug terminal, a plug terminal connection hole and a lead, and the insertion spring of the carbon brush assembly is in splicing connection with the plug terminal of the terminal assembly; the terminal assembly is linked with the plastic bracket by a riveted way; the carbon brush spring is a constantforce spring, the contact part of the carbon spring andthe bottom of the carbon brush is in an arc shape; and the lead is in pressure welding connection with the plug terminal connection hole. The invention has the advantages that the carbon brush assembly can be rapidly replaced through inserting and pulling the insertion spring; the constantforce spring has stable effective force and no angle change after abrasion, can reduce the commutation spark and prolong the service life of the motor; the lead is in pressure welding connection with the plug terminal, thereby ensuring the connection intensity and keeping favorable conductivity.

The invention discloses a sheet torsion rod spring structure, vehicle suspension and a manufacturing method of the sheet torsion rod spring structure. The torsion rod spring structure comprises two sheet type plate springs and a torsion rod, one end of either of the two sheet type plate springs is fixedly connected with one end of the torsion rod, the other end of either of the two sheet type plate springs is fixedly connected with a spherical hinge lining, the two spherical hinge linings are coaxial, and the central lines of the two spherical hinge linings are parallel with the central line of the torsion rod. The suspension makes up-down translational motion when a vehicle axle jumps, the angular change of a transmission shaft is small, and thus the smooth-going property of a vehicle isimproved. Meanwhile, because a transverse stabilizing rod and a lower longitudinal thrust rod are manufactured into a whole , the sheet torsion rod spring air suspension is simpler and more compact instructure, the suspension is low in weight, and the production cost is low.

A string arrangement device includes: a character string arrangement data acquisition unit for acquiring character string arrangement data for arranging a character string along a road; a control point sequence creation unit for creating a control point sequence from a road node sequence included in the character string arrangement data acquired by the character string arrangement data acquisition unit; a curve approximation unit for creating a node sequence obtained by approximating with a straight line a curve from the control point sequence created by the control point sequence creation unit; a curve approximation node sequence storage unit for storing the node sequence created by the curve approximation unit as a curve approximation node sequence; and a character string arrangement processing unit for performing arrangement processing of the character string based on the curve approximation node sequence stored in the curve approximation node sequence storage unit.

The present invention provides a polymerizable compound with a structure of general formula I, which exhibits none or few of the problems existing in the prior art. A polymerizable liquid crystal composition comprising the polymerizable compound has good stability and higher reliability, and is embodied by having a smaller pretilt angle change and higher voltage holding ratio. Also, there is little or no image sticking effect in a liquid crystal display device comprising the polymerizable liquid crystal composition. The present invention also provides a method of synthesizing a polymerizable compound with a structure of general formula I. The present invention further provides a polymerizable liquid crystal composition comprising the polymerizable compound and a liquid crystal display device comprising the polymerizable liquid crystal composition.

The invention discloses a stage style alloy female die core. The stage style alloy female die core comprises a first ladder (1), a second ladder (2) and a third ladder (3). The stage style alloy female die core is characterized in that the first ladder (1), the second ladder (2) and the third ladder (3) constitute the female die core, the middle of the female die core is provided with a mold cavity (4), the outer diameters of the first ladder (1), the second ladder (2) and the third ladder (3) are increased in sequence, the mold cavity (4) is a straight hole, a sunk angle hole or a stepped hole, and the female die core is prepared from alloy. The stage style alloy female die core is precise, reliable, efficient, durable, simple in structure and convenient to use, and is suitable for the popularization and application of molding of head and rod portions during heading of cold heading and warm heading.

The invention discloses a self-service nose swab intelligent collector for new coronavirus nucleic acid. The self-service nose swab intelligent collector comprises a collection unit, the collecting unit comprises a robot arm, an adjusting joint is arranged at the end of the robot arm and comprises a base, the upper end of the base is slidably connected with a driving block, the driving block is driven to slide back and forth along the base, the front section of the driving block is connected with a plurality of joint blocks, the first joint block is rotationally connected with the driving block, and the second joint block is rotationally connected with the driving block. The first joint block is hinged to the base through a connecting rod, and the other joint blocks are rotationally connected with the adjacent joint blocks and hinged to a second structure spaced by the joint blocks through connecting rods. The multiple joint blocks which are connected in series are driven by the sliding connecting rod mechanism to conduct angle adjustment, the angle change amplitude of the joint block close to the tail end is large, the angle change amplitude of the joint block away from the tail end is small, and therefore in the insertion preparation stage, the optimal insertion angle of the nose swab can be adjusted only through the change amplitude of the different joint blocks.

The invention discloses a pitching arm with an operation chamber and a material taking machine. The pitching arm (1) comprises a first supporting table (3), the operation chamber (2), a fixed supporting beam (8) and a walking stairway (7), wherein a supporting rod (5) and a telescopic cylinder (6) stretch upwards on the first supporting table (3); a bottom plate of the operation chamber (2) is hinged to the supporting rod (5) and the telescopic cylinder (6); the upper end of the walking stairway (7) is hinged to the operation chamber (2); a slide is formed inside the walking stairway (7); the fixed supporting beam (8) is provided with a roller; and the roller slides along the slide during the leveling process of the operation chamber (2). According to the pitching arm, the connection manner of the walking stairway and the fixed supporting beam is designed as that the fixed supporting beam slides on the walking stairway, so that the angle change of the walking stairway during pivotal leveling of the operation chamber can be reduced, the steep degree of the walking stairway is reduced, an operator walks on the walking stairway more conveniently, and the safety is improved.

A wheelless horizontal landing device comprises a skid structure (1), a skid buffer (2), and a foot pad (3). The upper end of the skid structural member (1) is mounted on the aircraft body structure through a pin shaft, and the bottom end is connected with the foot pad (3) through the pin shaft; One end of the skid buffer (2) is connected with the skid structure (1) and the other end is connectedwith the landing gear of the aircraft; At that time of lan, the skid structure (1) is inclined, the skid buff (2) is cushioned, and braking is realized by relative friction between the foot pad (3) and the runway.

The invention discloses a vortex type radiator. The vortex type radiator comprises a heat dissipation channel. A heat dissipation fin shell and a heat dissipation fan shell which are coaxial are sequentially connected to the front side and the rear side of the central axis of the heat dissipation channel. The heat dissipation channel, the heat dissipation fin shell and the heat dissipation fan shell are circular shells with the same diameter. A heat dissipation fan with the wind direction facing the heat dissipation fin shell is installed in the heat dissipation fan shell. A fixing disc is arranged at the center of a channel of the heat dissipation fin shell and fixed to the inner wall of the heat dissipation fin shell through a connecting rod. A transverse connecting column is fixed to the end, facing the heat dissipation fan, of the fixing disc. A plurality of sets of channel assemblies are wound on an outer ring of the connecting column, and the vortex lines of the channel assemblies spread and amplify outwards by taking the central axis of the connecting column as a circle center. The channel walls of the channel assemblies are embedded in one another in sequence, and the distances between the adjacent channel walls are equal. The gaps between the adjacent inner walls of the multiple sets of channel assemblies and the gaps between the channel assemblies and the heat dissipation fin shell are filled with heat dissipation fins. The radiator is high in heat dissipation and air utilization efficiency and good in heat dissipation effect.