82 results about "Archimedean spiral" patented technology

The invention discloses a cylindrical battery design method based on an Archimedes spiral formula, which comprises the following steps of: calculating the number of winding turns of a positive electrode, a negative electrode and two layers of diaphragms at one time through the Archimedes spiral formula; and establishing a relation curve of the number of winding turns, the winding radiuses and the winding curves xy of the four groups of assemblies on the battery simulation diagram, obtaining xy coordinate values of the corresponding winding curves of the four groups of assemblies, and completing the winding design of the cylindrical battery. After the positive electrode, the negative electrode and the diaphragm are wound, the diameter of the winding core is certainly and completely consistent with the preset diameter, and the situation that the winding core cannot enter a shell is avoided. Moreover, the method can directly simulate the cross section condition of the wound roll core in an excl table, can more visually judge the diameter of the wound roll core, the wrapping condition of a negative electrode to a positive electrode and other information, and provides great convenience for the design of the roll core.

According to the centrifugal pump with the double-spiral blades and the double-roller type granulator using the centrifugal pump, the double-spiral blades are adopted, and the first blade and the second blade influence and balance each other; the contour line of the working surface of the first blade is an Archimedes spiral, and the contour line of the back surface of the second blade is a logarithmic spiral; the contour line of the back face of the first blade comprises a part of a first equal-pitch spiral line close to the inlet side and a part of a first variable-pitch spiral line away from the inlet side, and the contour line of the working face of the second blade comprises a part of a second variable-pitch spiral line close to the inlet side and a part of a second equal-pitch spiral line away from the inlet side. According to the spiral vane pump, the instability of fluid in the spiral vane pump can be optimized, vibration and noise are reduced, the second vane is equivalent to supplement of the first vane, cavitation and cavitation are effectively reduced, and the hydraulic efficiency and the stable performance of the centrifugal pump are improved to a certain degree.

The present invention discloses an annular spiral acoustic black hole vibration damping structure, which relates to the technical field of vibration damping and noise reduction. The structure includes a central ring made of a high-temperature resistant material, a plurality of Archimedean spiral acoustic black holes, and an annular belt. The central ring is sleeved on the surface of the tubular structure to be vibration-damped. Each Archimedean spiral acoustic black hole is formed by curling the end of a one-dimensional acoustic black hole in the form of an Archimedean spiral around the tubular structure to be vibration-damped. The first ends of the one-dimensional acoustic black holes are all fixed on the surface of the tubular structure to be vibration-damped through the central ring, and the first ends of the one-dimensional acoustic black holes are evenly arranged in the circumferential direction of the tubular structure to be vibration-damped in the central ring. The thickness of the one-dimensional acoustic black hole decreases exponentially from the first end of the one-dimensional acoustic black hole to the end of the one-dimensional acoustic black hole. The damping annular belt adheres to the outermost contour of the Archimedean spiral acoustic black hole, and each annular belt together constitutes the outermost contour of the vibration damping structure. The present invention is applicable to the vibration damping and noise reduction of tubular structures, and is lightweight and high-temperature resistant.

The invention discloses a sound absorber based on an Archimedes spiral curled acoustic metamaterial and a preparation method, the sound absorber comprises a sound absorption metamaterial cell element, a sound absorption channel is formed in the sound absorption metamaterial cell element, the sound absorption channel vertically penetrates through the sound absorption metamaterial cell element in the z-axis direction, the sound absorption channel is a spiral channel on the xy two-dimensional section, and the spiral channel is a spiral channel. One end of the spiral channel is opened in the side face of the sound absorption metamaterial cell element, the other end of the spiral channel is a blind end located in the center of the sound absorption metamaterial cell element, and the spiral channel is composed of two Archimedes spiral curves. According to the invention, a brand new sound absorption mechanism is adopted, the problems of strong dispersion and narrow bandwidth which are difficult to solve by a conventional resonance type structure are solved, and effective sound absorption (more than 0.5) of a broadband frequency band (2000Hz) can be realized in a range of 0-6000Hz.

The invention relates to the technical field of aero-engine state monitoring, and discloses an aero-engine blade tip gap measuring probe and system based on an eddy current method.The aero-engine blade tip gap measuring probe adopts a coplanar Archimedes spiral double-coil array, and in the measuring process, the blade tip gap can be measured by applying anti-phase excitation; the common-mode noise suppression in the blade tip clearance measurement process is realized by combining a differential amplification circuit; signal extraction and temperature drift compensation are realized through a phase-locked amplification technology and an impedance-resistance orthogonal decoupling architecture, and finally micron-order gap analysis is realized. The aero-engine blade tip clearance measurement system provided by the invention can still keep excellent reliability under extreme working conditions of high temperature, high rotating speed and the like of a turbine, and meanwhile, the measurement precision of the blade tip clearance can be remarkably improved.

The present invention discloses an automated cutting device for plate production, which relates to the technical field of plate production, and comprises an inner frame, wherein the front and rear ends of the inner frame are respectively fixed with a front frame and a rear frame; a roller conveyor is fixedly installed in the rear frame; a shearing mechanism for shearing is provided in the front frame; a walking structure for enabling the shearing mechanism to move linearly therein is provided in the front frame; and rotating holes are provided on both sides of the rear frame above the roller conveyor. The disc provided in the present invention enables the shearing mechanism to move back and forth linearly. The disc is designed based on an Archimedean spiral. During the process of the disc pushing the shearing mechanism, there is a distance that is consistent with the direction of plate conveying and at the same speed. The shearing mechanism completes the cutting work in the uniform speed section, then resets, and reciprocates in sequence, thereby realizing continuous cutting motion, ensuring that the feeding process does not stop, so that feeding and shearing work are carried out simultaneously, thereby improving production efficiency.

The application discloses a kind of based on Archimedes spiral measurement roll bending tool of rotation angle, including base, multiple roll bending units and rotation correction unit;Rotation correction unit includes fixed seat, rotating wheel, measuring block and guide pin;The fixed seat and base fixed connection, rotating wheel is rotatably connected with fixed seat, measuring block is fixedly connected on rotating wheel, and measuring block is equipped with spiral groove, and Archimedes spiral coincides with the spiral groove path and the rotation axis of the same point and rotating wheel coincides;The application is according to Archimedes spiral principle, only needs to be converted into the rotation angle of rotating wheel by digital display range finder instrument determination guide pin displacement distance, and this angle is also the rotation angle of workpiece roll bending by the roll bending unit fixedly connected with rotating wheel, clever structure, without additional use specific mechanical measurement rotation angle after adjusting angle each time, greatly improve work efficiency, and measurement precision is high, guarantee the adjustment accuracy, effectively improve product quality.

The invention discloses a robot speed control method and device based on single-target planning, and relates to the technical field of robot control. Robot motion control basic parameters are obtained, and the constant advancing speed of the first robot serves as a decision variable; wherein the robot motion control basic parameters comprise structural parameters, path geometric features, kinematics parameters and a speed safety threshold value of the robot, the robot path adopts an Archimedes spiral, and the U-turn path is planned into two sections of tangent arcs; constructing a target function by taking maximization of the decision variable as a target; setting constraint conditions based on robot motion control basic parameters; constructing a single-target constraint optimization model by combining the target function, the constraint condition and a robot speed calculation model; the single-target constraint optimization model is solved, and the maximum speed of the robot in the U-turn area is calculated through simulation. The problem of how to control the performance speed of the robot and guarantee the safety of the performance process of the robot is solved.

The invention belongs to the technical field of static mixers, and provides an Archimedes spiral-based static mixer jet structure and a working method thereof, the Archimedes spiral-based static mixer jet structure comprises a shell, and a spiral jet branch pipe and a mixing element arranged in the shell; each spiral injection branch pipe comprises an air inlet pipe, a spiral pipe connected with the air inlet pipe and a plurality of air outlet pipes arranged on the spiral pipe; the spiral pipe is of an Archimedes spiral structure, the air inlet pipe penetrates through the shell, the spiral pipe is located in the shell, and an air outlet of the air outlet pipe faces the mixing element. The multi-path hydrogen nozzles arranged in the Archimedes spiral are combined with the mixing element, so that the hydrogen can be uniformly dispersed and sprayed in a three-dimensional space, the mixing uniformity of the hydrogen and natural gas is effectively improved, the hydrogen is prevented from being enriched along the pipe wall due to density difference or the local concentration is prevented from being too high, and the material degradation and leakage risk caused by hydrogen embrittlement is remarkably reduced.

The invention provides a measuring device for alloy fluidity in a concentric three-spiral-line thin-wall casting, a using method and a predicting method, and belongs to the field of liquid metal fluidity testing. The method is used for solving the problems that in the prior art, the flowing property and the mold filling property of liquid metal in the thin-wall casting pouring process cannot be accurately measured, and the actual mold filling condition of the thin-wall casting cannot be synchronized through flowing property testing. The device comprises a concentric triple-helix pattern, a sprue pattern, an outer sprue pattern, a lower sand box, an upper sand box and an outer sprue sand box, the upper sand box is mounted on the lower sand box, the concentric triple-helix pattern is mounted in the lower sand box, the outer sprue sand box is mounted on the upper sand box, the sprue pattern is mounted in the upper sand box, and the outer sprue pattern is mounted in the outer sprue sand box. The outer sprue pattern is mounted in the outer sprue sand box, the sprue pattern is connected with the outer sprue pattern, and the concentric triple-helix pattern is expanded in the radial direction of the sprue pattern in the Archimedes spiral direction. The device is mainly used for testing liquid metal fluidity.

The invention discloses self-dispersing anti-blocking single-shaft compression equipment which comprises a machine shell, a compression roller, an extrusion plate and a driving device, and the compression roller is rotationally installed in the machine shell and comprises a first rotating shaft and a plurality of compression cutter tooth discs fixedly installed on the first rotating shaft at intervals; a plurality of cutter teeth are annularly arranged on the periphery of each compression cutter fluted disc at equal intervals, the compression cutter fluted discs are distributed into two symmetrical groups, and the corresponding cutter teeth on each compression cutter fluted disc in each group are distributed along an Archimedes spiral; the extrusion plate is rotationally installed in the machine shell and obliquely arranged on one side of the compression roller, the driving device is in transmission connection with the compression roller and the extrusion plate, and the driving device is used for driving the compression roller to rotate so as to be matched with the extrusion plate to compress the hollow bottle body and is also used for driving the extrusion plate to do reciprocating swing motion relative to the compression roller. According to the self-dispersing device, the occlusal force and the grabbing force on the bottle bodies can be improved, self-dispersing of the fed bottle bodies is achieved, accumulation and material blocking are avoided, and the self-dispersing device can be matched with compression treatment of large-size bottle bodies.

The invention provides a laser welding method and laser welding equipment for plates. The method comprises the steps that a welding unit is controlled to conduct laser welding along a first track; the first track is roughly in an Archimedes spiral shape; the starting point of the first track deviates from the center of the first track; the curvature radius of the starting point of the first track is larger than the spot radius of the laser. The laser welding method and the laser welding equipment for the plate can reduce the continuous staying time of the laser in the center position of the first track, and reduce the risk that the plate is welded through.

Torsional damper (10) for an agricultural machine, comprising an input element (12), an output element (14), an elastic element (16), a hydraulic damping device (18), wherein the elastic element (16) is received in a receptacle (50) with a guide contour and / or a window (46) with a guide contour of input element (12) and output element (14), wherein the elastic element (16) comprises a helical spring (30) and two spring plates (32) which are arranged at the axial ends of the helical spring (30), wherein the guide contour of receptacle and / or window is designed as a superimposed guide contour or wherein the guide contour of receptacle and / or window is designed in the form of an Archimedean spiral. Furthermore, an agricultural machine equipped with such a torsional damper is described.

The invention relates to a hobbing cutter grinding wheel diameter calculation method based on the Archimedes spiral relation. According to the method, the space relation between the rear tool faces of front-row tool teeth of the hobbing cutter and a grinding wheel is inversely calculated by establishing a hobbing cutter spiral three-dimensional model and combining an Archimedes spiral, and therefore it is guaranteed that when the tail ends of the front-row tool teeth are machined, the grinding wheel cannot interfere with rear-row tool teeth of the hobbing cutter. The method comprises the following specific steps: generating a spiral line of the hobbing cutter and a three-dimensional model of the spiral line according to geometric parameters of the hobbing cutter; a rear row cutter tooth tip space curve and a front row cutter tooth tip space curve of the hobbing cutter are obtained, the Archimedes spiral cluster of the rear cutter face of the hobbing cutter is calculated, and the maximum diameter of a grinding wheel is determined by calculating the normal vector of the position, prone to interference, of the rear cutter face of the front row cutter tooth. According to the method, the calculation precision of the diameter of the grinding wheel is effectively improved, the interference problem in the hobbing cutter machining process is avoided, and the machining quality and efficiency are ensured.

The invention discloses a mobile robot motion planning method using an Archimedes spiral. The motion planning method comprises the steps that a robot kinematics model under a polar coordinate system with a target position as a pole and a target posture as a polar axis is established; under the condition that obstacles are not considered, robot path planning is conducted through the Archimedes spiral; an improved probability route map path planning algorithm of the Archimedes spiral is combined, and an optimized robot collision-free smooth path is obtained; and based on the Archimedes spiral curvature and a speed planning algorithm meeting robot motion capability constraints, the optimized expected speed of the robot is obtained, and finally motion planning of the robot is achieved. According to the method, the optimal path planning can be quickly realized in a complex environment, the generated path meets kinematics constraints and is smooth and visual, the planning speed considers the influence of curvature on motion stability, and the motion capability constraints of the robot are considered, so that the robot can quickly and stably reach the target pose.

The invention discloses a torque measuring device and method based on Archimedes spiral corner displacement conversion. The device comprises an elastic shaft, a first displacement sensor and a second displacement sensor, and a first measuring gear and a second measuring gear which are of an integrated structure with the elastic shaft are arranged on the outer side of the elastic shaft. The two displacement sensors are respectively arranged right below the two measuring gears; carrying out a calibration experiment on the relation between the angular displacement at each measurement gear and the output quantity of the corresponding displacement sensor; calibration experiment results are processed to obtain proportionality coefficients of the two measuring gears and extreme values of output quantities of the two displacement sensors; the output quantities of the two displacement sensors in the torque loading process are collected in real time; actual measurement data is processed to obtain angular displacement variation before and after torque loading at the two measuring gears, the difference value of the two angular displacement variation is the relative torsion angle of the two ends of the elastic shaft, and the torque of the rotating shaft to be measured is calculated. The method is suitable for dynamic torque monitoring of a rotating mechanical system.

This invention discloses a valve positioner motion conversion mechanism and an intelligent valve positioner. The valve positioner motion conversion mechanism includes a valve stem that drives the valve to open and close via up-and-down movement. A lever is disposed on the side of the valve stem, and the lever has a bearing fixed to an input shaft. A curved groove is provided in the lever, in which a lever can move. The shape of the curved groove is determined by a constant-velocity Archimedean spiral, the polar equation of which is: r = a + bθ, where: r represents the polar radius; a represents the distance from the starting point of the spiral to the center of rotation; θ represents the polar angle; and b is the increase in distance of r after each certain angle θ. The intelligent valve positioner includes a positioner housing, a potentiometer and a potentiometer gear extending from the potentiometer, an input gear, and an input shaft. It also includes a valve positioner motion conversion mechanism connecting the lever to the input shaft of the valve positioner. The structure is simple and the operation is stable.

The application discloses a cylindrical battery design method based on an Archimedes spiral formula, which completes the calculation of the winding number of the positive electrode, the negative electrode and two layers of the separator by the Archimedes spiral equation, then carries out winding simulation on the four groups of components respectively, establishes the relationship curve of the winding number, the winding radius and the winding curve xy of the four groups of components on the battery simulation diagram, obtains the xy coordinate values of the corresponding winding curve of the four groups of components, and completes the winding design of the cylindrical battery. The application guarantees that the diameter of the winding core is completely consistent with the preset diameter after the winding of the positive electrode, the negative electrode and the separator is completed, and the winding core cannot enter the shell. Moreover, the method can simulate the cross-section condition of the winding core after winding in the execl table directly, can more intuitively judge the diameter of the winding core, the wrapping condition of the negative electrode to the positive electrode and other information, and provides great convenience for the design of the winding core.

The variable stiffness compliant gripping device based on the Archimedean spiral principle belongs to the field of mechanical structure design. Existing flexible grippers are unable to grip heavy objects, while flexible grippers with control technology have low operating efficiency and are sensitive to the working environment. A DC motor drives the top-level clamping jaw assembly located on the clamping jaw base to open or close through a driving mechanism; after each upper swing arm is buckled with a lower swing arm, each is connected to a spring mounting frame through a spring to form a swing arm assembly. The lower swing arms in the two swing arm assemblies always remain parallel and are installed in opposite directions. The head ends of the two lower swing arms are rotatably connected to the surface of the drive disk, and the two spring mounting frames are both fixed to the surface of the drive disk; the transmission rocker is a T-bar, and the two ends of the horizontal bar of the T-bar are connected to a slider, each slider slides in the grooves in the upper and lower swing arms, and the vertical bar of the T-bar extends out of the drive disk and is fixedly connected to the top left clamping jaw arm. The present invention is used for compliant gripping of objects.

The present invention relates to the field of flange technology, and proposes a flange that is easy to install and an installation method, wherein the flange that is easy to install includes a flange plate body, a rotating plate and an adjusting plate. An annular groove is provided on one side of the flange plate body, and the adjusting plate is installed in the annular groove through a detachable structure, and an Archimedean spiral groove is provided on its end face. A plurality of radially sliding positioning claws are provided in the circular through hole, and the positioning claws are engaged with the spiral groove to achieve synchronous movement through teeth. During installation, the rotating adjusting plate drives the positioning claws to press against the inner wall of the pipe, and the flange is welded and fixed after self-centering. The rotating plate cooperates with the annular groove through a guide block to adjust the angle of the bolt hole. The present invention solves the problems of inaccurate installation alignment, cumbersome centering steps, strong dependence on the experience of construction personnel, poor sealing and low efficiency of traditional flanges through multi-claw synchronous positioning, dynamic sealing compensation and modular design, and significantly improves the installation accuracy, anti-leakage performance and construction efficiency.

A component 2 for containing fluid fuel which is to be shocked by a shockwave incident on the component. The component includes a first part 4 and a second part 6 which define a chamber 8 configured to contain the fluid fuel. The first part and the second part are connected at a joint 10, at least a portion of which follows a non-linear path, which may be an Archimedean spiral path. The joint may be configured to allow the fluid fuel to be supplied to the chamber. The component may be rotationally symmetric about a central axis.

The present invention relates to an elastic element of a robotic series elastic actuator, specifically a bidirectional multi-branch planar scroll torsion spring, which is installed by stacking two torsion spring elastic bodies with opposite helix directions; each torsion spring elastic body has a plurality of elastic body branches with the same helix direction, in the shape of an Archimedean spiral, and deformable. The elastic body branches are evenly arranged circumferentially clockwise or counterclockwise around the rotation center of the torsion spring. There is a gap as the deformation space of the torsion spring elastic body between adjacent two elastic body branches in the no-load state; a single elastic body has the problem of insufficient load-bearing capacity in both positive and negative directions under the action of torque. The method of pre-tightening and installing two torsion spring elastic bodies with different helix directions can enable the torsion spring to have a large load-bearing capacity in both positive and negative directions. The structure of the present invention is compact and has good mechanical properties. It can be used as an elastic element of a robotic flexible joint, and is particularly suitable as an elastic element of a rotary series elastic actuator.

A numerically controlled coil winding machine for large-diameter Archimedean spiral lines, comprising a continuous bending device and a material receiving rack. The material receiving rack includes a support frame. The continuous bending device is located on one side of the support frame and is close to the support frame. A sliding bracket is slidably arranged on the upper part of the support frame, and the sliding bracket is arranged to move back and forth along a horizontal straight line direction towards the continuous bending device. Horizontally arranged supporting rollers are circumferentially distributed around the middle of the sliding bracket; strip-shaped chutes are arranged on both sides of the continuous bending device adjacent to the material receiving rack. The strip-shaped chutes are horizontally arranged and located outside the continuous bending device. The outer ends of the two supporting rollers are respectively located on both sides of the continuous bending device and are respectively in sliding fit with the strip-shaped chutes. By providing a material receiving rack that can move to receive materials, as the bending diameter increases, the position of the coil is adaptively moved, thereby avoiding the bending springback of the pipeline, ensuring that the distance between the pipes in the flat coil remains unchanged, and further ensuring the effect of the coil.

The utility model relates to a kind of corrosion resistant pump, belong to centrifugal pump technical field.The corrosion resistant pump includes front part pressurizing volute and rear volute, front part pressurizing volute includes pressure line, throat pipe, diffusion pipe and discharge pipe connected in turn, pressure line is vertically arranged, throat pipe and diffusion pipe jointly constitute Archimedes spiral line pipe, discharge pipe includes elbow and horizontal straight pipe, discharge pipe is communicated with the inlet of rear volute, the inside of pressure line is provided with nozzle, nozzle is communicated with the outlet of rear volute by reflux pipe, corrosion resistant pump further includes impeller, pump cover and suspension, pump cover and rear volute form a complete cavity, impeller is installed in cavity, and impeller is connected with the pump shaft of suspension.The corrosion resistant pump is small in pump body volume, saves space, can promote impeller inlet pressure, prevent medium from vaporizing in the process of suction due to pump inlet pressure being negative pressure, cause pump to produce cavitation, reduce the service life of pump.

The invention relates to the technical field of variable-diameter pipe spinning composite processes, and particularly discloses a variable-diameter pipe bending die hole dynamic online adjusting method based on a spinning composite process, which is used for realizing online regulation and control on the size of the hole diameter of a bending die under the existing process technology. Reducer pipe spinning forming is achieved through the composite technology of pipe spinning and bent pipe forming, track amplitude definition is conducted on a necking spinning roller through the Archimedes spiral equation, and size collection is conducted on a pipe through a laser diameter measuring sensor after spinning forming is conducted. And establishing a mapping relation model between the diameter Dvar of the reducer pipe and the radius R2 of the point on the top / bottom elliptical plane corresponding to the contact point of the two rollers, deducing and solving a relational expression between the radius R of the point on the ellipse and the rotation angle theta according to the mapping relation model in the above steps, and rapidly obtaining the rotation angle theta of the elliptical roller. And the rotating angle theta of the bending die is controlled, and online regulation and control of the aperture size of the bending die are achieved. By means of the variable-diameter pipe bending device, variable-diameter pipe bending forming within a certain pipe diameter range is achieved, and the die does not need to be replaced according to different pipe diameters.

An elastic pressing type full-automatic tension compensator for an electrified railway mainly comprises an anchor column stay wire, an anchor column, a wheel carrier, a pawl, a spiral multifunctional wheel, a steel wire rope, an insulator, an upper end connector, an actuating rod, a wire, a nut, a hoop, a spring outer cylinder, an outer spring, an inner spring, a spring inner cylinder, an inner spring pulling plate, an outer spring pulling plate, a spring cylinder lug and a mounting base. The relation between deformation of an elastic object and acting force, the Archimedes spiral principle, the force arm equality principle and the linear principle that a direct load spring is within the elastic range are used. And the energy conversion acting actuating rod moves to carry out full-automatic tension compensation on the overhead line system cable. The tension compensation device has the advantages of being simple, practical, reliable in performance, constant in compensation tension, complete in function, small in occupied space, convenient to use and the like, and can meet full-automatic tension compensation of electrified railway overhead line system cables.

The utility model relates to the technical field of wind driven generators, in particular to a horizontal shaft type breeze wind turbine which comprises a support, a rotating shaft, rose-shaped fan blades and lifting force type blades, the rotating shaft is horizontally arranged on the support, the two ends of the rotating shaft are rotationally connected with the support, and each rose-shaped fan blade comprises a shaft sleeve and an arc-shaped fan blade. The arc-shaped fan blades are wound on the shaft sleeve according to the Archimedes spiral line, the lift force type blades are fixed to the rose-shaped fan blades, the downwind rotation directions of the rose-shaped fan blades and the lift force type blades are the same, and the rose-shaped fan blades are resistance type blades, are not high in rotation speed but large in output torque and can be rapidly started under the condition of low wind speed. And a higher blade tip rate ratio can be obtained by being matched with a lift type blade for use. The rose-shaped fan blade is provided with three arc-shaped fan blades, the lift-type fan blade is provided with three sets of supporting rods and wing-shaped fan blades, the supporting rods play a role in supporting and fixing the arc-shaped fan blades, and the wing-shaped fan blades can obtain a higher blade tip rate ratio.

The present invention relates to a method for calculating the diameter of a gear hobbing cutter grinding wheel based on an Archimedean spiral relationship. The method establishes a three-dimensional model of a gear hobbing cutter spiral and combines the Archimedean spiral to reversely calculate the spatial relationship between the back face of the front row of gear hobbing cutter teeth and the grinding wheel, thereby ensuring that the grinding wheel will not interfere with the back row of gear hobbing cutter teeth when processing to the end of the front row of gear hobbing cutter teeth. The specific steps include: generating the helix of the gear hobbing cutter and its three-dimensional model according to the geometric parameters of the gear hobbing cutter; obtaining the spatial curve of the tip of the back row of gear hobbing cutter teeth and the spatial curve of the tip of the front row of gear hobbing cutter teeth, calculating the Archimedean spiral cluster of the back face of the gear hobbing cutter, and determining the maximum diameter of the grinding wheel by calculating the normal vector of the interference-prone position of the back face of the front row of gear hobbing teeth. The method effectively improves the calculation accuracy of the grinding wheel diameter, avoids the interference problem in the gear hobbing cutter processing process, and ensures the processing quality and efficiency.

The invention relates to a special fixture device for outer circle grinding of a backing bearing outer ring, and relates to the technical field of bearing grinding. Comprising a mandrel, an expansion sleeve, a positioning pin, an outer ring, a steel ball limiting sleeve, an expansion steel ball, a positioning block and a clamping block, the expansion sleeve is fastened to the mandrel, and an Archimedes spiral track is arranged on the outer ring of the expansion sleeve and used for supporting and driving the expansion steel ball so as to conduct radial positioning on the outer ring of the backing bearing; a pin hole is formed in the middle of the expansion sleeve; the positioning pin axially positions the outer ring through the annular groove; the tensioning steel ball is positioned in the steel ball limiting sleeve in a clearance fit manner, and the steel ball limiting sleeve is embedded in a hole of the outer ring to play a role of a retainer of the deep groove ball bearing; the positioning block is positioned on the right end face of the outer ring through a second screw, and the clamping block is installed on the left end face of the outer ring through a first screw. The expansion sleeve moves on the Archimedes spiral track through the expansion steel ball, radial positioning of an inner hole of the outer ring of the backing bearing is achieved, and precise grinding of the outer ring of the backing bearing is achieved under the action of the positioning block and the clamping block.

The invention relates to the technical field of valves, and particularly discloses a micro flow adjusting structure applied to particle-containing working conditions, which comprises a valve body, a valve seat, a valve rod and a valve core, the valve core is in close fit with the top of the valve seat, the valve rod drives the valve core to move relative to the valve seat, the sectional area of a flow channel between the valve core and the valve seat is controlled, and flow adjustment is realized; a throttling device is arranged at the bottom of the valve body and comprises a throttling part, a cleaning part and a connecting part which are sequentially connected from top to bottom, and the throttling part is in close fit with the bottom of the valve seat; the connecting part is movably inserted into the bottom of the valve body, the connecting part moves relative to the valve body to drive the throttling part to move relative to the valve seat, the sectional area of a flow channel between the throttling part and the valve seat is controlled, and flow adjustment is achieved. A reverse Archimedes spiral groove is formed in the outer wall of the cleaning part. By means of the technical scheme, the technical problems that in the prior art, dynamic sealing and self-cleaning capacity is insufficient, and micro-flow precision and particle resistance cannot be considered at the same time can be solved.