2677 results about "Gear tooth" patented technology

The invention relates to an electric operating device for a manual valve. The electric operating device comprises a small diesel generating set used for providing a power source, a motor, a planetary gear transmission module, an adjustable fixing disc and a control device, wherein the small diesel generating set supplies power to the motor so as to provide operating power; an adjustable base is arranged at the bottom of the motor, an output shaft of the motor is connected with a sun gear of the planetary gear transmission module, a gear ring of the planetary gear transmission module is meshed with a first planet gear and fixed to the adjustable base, and a first planet carrier of the planetary gear transmission module is connected with an adjustable fixing disc. The adjustable fixing disc is detachably installed on a manual operation door wheel of the valve and used for operating a valve switch. The control device is used for starting and stopping the small diesel generator set and the motor, the problem of energy dependence can be solved, and the first-aid repair efficiency is greatly improved. And meanwhile, the problem that a motor is burnt or gear teeth are broken due to rusting and jamming of a field valve is solved.

The invention discloses a design method of a complex shape modifying and finishing wheel and a honing wheel for internal meshing powerful gear honing, and relates to the technical field of machine manufacturing. The method comprises the following steps: establishing a trimming wheel tooth surface numerical model, and judging whether the modification amount of the trimming wheel tooth surface numerical model meets the modification requirement or not; if yes, establishing a space coordinate conversion relation and a conjugate meshing equation of the dressing wheel and the honing wheel, and establishing a honing wheel tooth surface numerical model in combination with the dressing wheel tooth surface numerical model; according to the space coordinate conversion relation between the workpiece gear and the honing wheel and the honing wheel tooth surface numerical model, a complex modification workpiece gear tooth surface numerical model is established, and whether the modification amount of the complex modification workpiece gear tooth surface numerical model meets the modification requirement or not is judged; and if yes, a dressing wheel three-dimensional solid model and a honing wheel three-dimensional solid model are established according to the dressing wheel tooth surface numerical model and the honing wheel tooth surface numerical model respectively. According to the method, precise design and verification of the complex shape modifying and finishing wheel and the honing wheel for powerful gear honing can be achieved.

The invention discloses a face gear planetary transmission system dynamic uniform load test platform and test method, and belongs to the field of gear transmission, and the test platform comprises a rack, a drive motor, a step-up gear box, a face gear planetary transmission system, a magnetic powder brake, a torque sensor, a slip ring, a stress strain test system and the like. The face gear planetary transmission system comprises an input face gear, a planet wheel, a planet carrier, a fixed face gear and the like. According to the dynamic uniform load test, stress values at the tooth root of the face gear and the tooth root of the planetary gear are measured mainly through strain gauges, and the corresponding relation between the tooth root stress and the meshing force at the gear meshing point is obtained through finite element simulation. And calculating the dynamic uniform load coefficient according to the dynamic meshing force root-mean-square values and the average values obtained at the tooth roots of the face gear and the planetary gear. By testing and analyzing the dynamic uniform load coefficient, the load distribution characteristic of the face gear planetary transmission system can be accurately revealed, a scientific basis is provided for structural parameter optimization, meshing performance improvement and reliability design of the face gear planetary transmission system, and then accurate and high-performance design of the transmission system is achieved.

The invention provides a tool applied to the field of petroleum drilling, and particularly relates to an underground non-circular gear intelligent impact tool which comprises a power module, an axial impact module and a circumferential impact module, the power module enables drilling fluid to impact a turbine in a directional mode through a drainage disc, hydraulic energy is converted into mechanical energy, and the mechanical energy is transmitted to the axial impact module. The power is transmitted to the axial impact module and the circumferential impact module, the axial impact module lifts a rack punch hammer to compress a spring through meshing of an incomplete gear and the rack punch hammer, and when the incomplete gear is disengaged from the rack punch hammer, the spring releases energy to generate axial impact downwards. The circumferential impact module is composed of two groups of incomplete gears and racks which are arranged in an up-down 90-degree staggered mode, the rack punch hammer compresses a spring through meshing of the incomplete gears and the rack punch hammer, and the spring is released to generate circumferential impact when the incomplete gears and the rack punch hammer are disengaged. Periodic impact can be achieved, the mechanical rock breaking efficiency is effectively improved, and the stick-slip phenomenon at the drill bit is reduced.

The invention provides an abrasive flow polishing device and method for gear tooth surface homogenization. According to the method, tooth-shaped drainage pieces with the same shape as the gear are installed at the two ends of the upper portion and the lower portion of the gear, drainage section design is introduced, an abrasive flow medium path runner model is constructed, main parameters influencing an experiment are sampled and grouped through a Latin hypercube sampling method, abrasive flow polishing simulation is conducted in a grouped mode, and a Gaussian regression process is utilized to obtain an abrasive flow polishing simulation result. Selecting the minimum root-mean-square error of each group of PiVi data, determining the group of experimental parameters, obtaining a group of abrasive flow machining process parameters of optimal inlet pressure, back pressure and drainage section length, and finally guiding the experiment; according to the method, the influence of the inlet effect is relieved, the abrasive flow medium path runner model is constructed, a set of optimal abrasive flow machining process parameter combination is obtained, and the method is suitable for spur gears and bevel gears and high in universality.

The invention provides a gear peeling time-varying meshing stiffness prediction method and system based on a back propagation neural network, and the method comprises the steps: considering a tooth surface peeling fault based on a gear tooth bearing contact analysis method, and constructing a helical gear pair time-varying meshing stiffness calculation model; a real irregular tooth surface peeling area is fitted by adopting a least square ellipse fitting method to obtain an ellipse appearance representation, any peeling position is completely described through six key geometric parameters, the geometric parameters of the ellipse appearance are systematically traversed and fitted, and diversified peeling appearance samples are generated. Introducing a tooth profile deviation matrix corresponding to the peeling morphology sample into a tooth surface bearing contact analysis model, and constructing a training data set; and constructing a back propagation neural network model of multiple hidden layers, and performing end-to-end training by using the training data set, so that the back propagation neural network model learns a nonlinear mapping relationship from geometric parameters to a time-varying meshing stiffness curve, thereby predicting the time-varying meshing stiffness under any peeling morphology.

The invention relates to the technical field of workpiece pose monitoring, in particular to a tooth cutting machining workpiece pose error monitoring system, which comprises a visual acquisition module, an industrial camera coordinate system and a workpiece coordinate system, wherein the visual acquisition module is used for establishing a machine tool coordinate system, an industrial camera coordinate system and a workpiece coordinate system; the coordinate system calibration module is used for associating a machine tool coordinate system, an industrial camera coordinate system and a workpiece coordinate system to obtain coordinate system conversion parameters; the image processing and pose calculation module is used for acquiring actual pose information of a workpiece relative to a cutter spindle; the error analysis and feedback module generates pose error information; and the motion control module is used for performing translation error compensation and rotation error compensation on the workpiece and adjusting the pose of the workpiece. According to the invention, the high-precision quantitative analysis of the workpiece pose error is realized by collecting the image and establishing the multi-coordinate system association. The pose error monitoring efficiency is greatly improved, errors caused by subjective judgment are avoided, and the tooth pitch accumulated error, the tooth direction inclination error and the tooth profile inclination error are effectively reduced.

The invention provides a gear tooth surface precision detection method based on a deep learning network, a medium and equipment, and mainly solves the problem of insufficient model generalization ability caused by scarcity of real labeled data and domain difference in an existing method. The method comprises the following steps: collecting a plane workpiece image marked with a roughness level as a source domain data set, and pre-training an intelligent detection model; based on a gear shaping machining meshing motion relation, establishing a tooth surface morphology geometric simulation model, and generating virtual gear tooth surface images of different roughness grades; extracting a real gear tooth surface area image as a target domain sample; a domain adaptation method based on clustering optimal transmission is adopted, the feature distribution difference between a source domain and a target domain is calculated and minimized, model parameters are optimized, and self-adaptive migration of a feature space from a plane image to a gear tooth surface is achieved. According to the method, virtual sample generation and a domain adaptation technology are combined, so that the data acquisition cost is effectively reduced, and the detection precision and the model generalization ability under the small sample condition are remarkably improved.

The invention provides an underground centralizing device and method for a casing deformation well, and relates to the technical field of oil exploitation equipment, and the underground centralizing device comprises a coiled tubing, at least two sleeves, a connecting rod mechanism and a contact area increasing mechanism. A convex ring is arranged on the outer wall of the coiled tubing, the sleeve is slidably sleeved on the coiled tubing, and the convex ring is located in the sleeve to form a pressure cavity. The connecting rod mechanism is connected to the sleeve and used for expanding outwards when the sleeve moves relatively. The sleeves are close to each other by pressing the coiled tubing, and the connecting rod mechanism is driven to expand towards the well wall to achieve righting. The contact area increasing mechanism increases the contact area with the well wall through linkage cooperation of a gear, a rack and a top plate, and the connecting rod is prevented from sinking into the well wall. A mechanical connecting rod structure is adopted to replace a traditional air bag type centralizer, the influence of the gravity effect on the centralizing effect is effectively avoided, and it is ensured that the coiled tubing is accurately kept in the center position of a shaft.

The invention discloses a low-noise stable planetary gear speed reducer, and relates to the technical field of speed reducer equipment. Comprising a main body mechanism, the main body mechanism comprises a main body bin, a front cover is fixedly buckled on one side of the main body bin, and a rear cover is fixedly buckled on the other side of the main body bin; a gear ring is fixedly connected to the middle of the inner wall of the body bin. A discharging assembly is arranged on the lower wall of the body bin. A tailstock mechanism is arranged on one side of the main body mechanism; an oil conveying mechanism is arranged on the other side of the main body mechanism; an oil injection assembly is arranged between the main body mechanism and the tailstock mechanism, the oil injection assembly comprises an oil tank mechanism, and nozzle mechanisms inserted into the main body bin are uniformly communicated with the oil tank mechanism at equal intervals; the oil tank mechanism comprises an oil tank, a tank cover is fixedly buckled to one side of the oil tank, the tank cover is fixedly connected with a rear cover, an input assembly is arranged on one side of the upper wall of the oil tank, impurities hidden in tooth seams can be flushed out and flow out along with leaked oil, and the impurity removing performance is improved.

The invention relates to photoelectric integrated COB packaging equipment, and relates to the technical field of semiconductor packaging, and the photoelectric integrated COB packaging equipment comprises a chip mounting module used for grabbing and mounting a chip, a substrate conveying module used for conveying a substrate, and a photoelectric synchronous packaging module used for realizing interconnection packaging of the chip and the substrate. By arranging the vacuum adsorption adjusting mechanism, when chips of different specifications need to be adapted, the motor drives the rotating disc to rotate, and the rotating disc is meshed with a gear ring structure on the outer layer of the annular disc through gear teeth to drive the annular disc to rotate; a conical tooth structure on the inner side of the annular disc is meshed with a plurality of groups of bevel gears to drive the bevel gears to synchronously rotate so as to drive a threaded column fixed with the bevel gears to rotate; when the threaded column rotates, the movable plate in threaded connection moves in the axial direction of the threaded column, and the distance between the suction nozzles is adjusted. And meanwhile, the vacuum generator independently provides negative pressure for each group of suction nozzles through the air pipe, so that on-off of the negative pressure can be independently controlled to adapt to adsorption and release of chips with different sizes.

The invention discloses a high-performance and long-service-life gearbox assembly which comprises a gearbox body, a gear shaft and a gear. The gear shaft is installed in a bearing sleeve through a first rolling bearing. A fan assembly is mounted on the right end shaft section of the gear shaft; the centrifugal fan is characterized in that the fan assembly comprises a shell, a first impeller, a second impeller and a second rolling bearing, the first side wall of the shell is fixedly connected with an end flange of the bearing sleeve, and the first impeller and the second impeller are installed on the right end shaft section and installed in an impeller cavity defined by the shell; the inner peripheral wall of the second impeller is connected with the right end shaft section through a second rolling bearing; the gear shaft can drive the first impeller to rotate in a torque transmission mode, and at the moment, the second impeller passively rotates under the acting force of suction airflow of the first impeller. The suction performance, flow and efficiency of the fan assembly can be improved, so that the heat dissipation effect on the bearing is improved, the heat exchange efficiency of airflow in the gearbox is improved, the operation performance of the gearbox is improved, and the service life of the gearbox is prolonged.

This application provides a rotating shaft and an electronic device. Where the rotating shaft comprises a mounting shaft, a rotating member, a first cam, and a second cam, the rotating member, the rotating member comprise a first mating gear tooth and a second mating gear tooth. A first gear tooth is disposed on the first cam, the first gear tooth includes a first damping part, and a first included angle exists between the first damping part and a radial direction of the mounting shaft. A second gear tooth is disposed on the second cam, the second gear tooth includes a hovering part, a second included angle exists between the hovering part and the radial direction of the mounting shaft, and the second included angle is greater than the first included angle.

The present application belongs to the technical field of gear machining, and discloses a forming milling machining method of spherical gear. The method uses a disc-shaped milling cutter to machine the spherical gear, and the steps are as follows: firstly, the parameters of the spherical gear are given, the tooth surface equation of the spherical gear is derived, and the tooth surface normal vector is calculated; secondly, the forming milling machining coordinate system of the spherical gear is established, and the homogeneous transformation matrix between the coordinate systems is derived, and then the contact line equation between the spherical gear and the disc-shaped milling cutter is derived; then, the cross-sectional profile of the disc-shaped milling cutter is calculated, and then the rotary surface of the disc-shaped milling cutter is obtained; finally, the spherical gear is formed and milled by using the calculated disc-shaped milling cutter, and after machining an annular gear slot, the disc-shaped milling cutter is rotated by a certain angle to continue machining the next gear slot. The forming milling machining method of the spherical gear proposed by the present application can realize the machining of the spherical gear without relying on special gear machining machine tools, and the disc-shaped milling cutter used has a simple structure and is easy to manufacture.

The invention relates to the technical field of rubber processing, in particular to a rotary positioning, weighing and stacking device for cold-cut rubber sheets, which comprises a movable base frame comprising a base body, a frame bottom plate and an electric telescopic rod, the base body and the frame bottom plate are in sliding connection, the electric telescopic rod drives the base body to move horizontally, and a mechanical arm is fixedly arranged on the base body; the pallet base component group comprises a top plate, a bottom plate and a bottom plate; the top of the top plate is provided with a bearing pallet; and the wagon balance assembly is used for weighing the load of the top plate. Through a pure mechanical linkage mechanism formed by a lower gear piece, a vertical lead screw piece and the like, switching and resetting of a top plate support between a weighing assembly and a bearing assembly are automatically achieved through rotation action, continuous and stable supporting is guaranteed accurately and synchronously through a gear, a rack and the like, meanwhile, an electric telescopic rod of a movable base frame drives a mechanical arm to avoid, and the mechanical arm is fixed. And the space interference with the rotary pallet is solved.

The invention discloses a noise reduction ratchet wheel and pawl structure which is composed of a noise reduction spring and a pawl body, the noise reduction spring is arranged on the surface of one side of the pawl body, and the noise reduction spring and the pawl body are of an integrated structure. The silencing spring on the pawl body is firstly in spring collision with gear teeth of the ratchet wheel body; when the pawl body continues to rotate, a gap between the pawl body and the noise reduction spring is eliminated, the pawl body elastically collides with the noise reduction spring, and therefore noise generated by collision is reduced.

The invention discloses a modeling method for a thermally induced tooth surface error of a spiral bevel gear. The modeling method comprises the following steps: S1, establishing a motion coordinate system of a cradle type gear milling machine; s2, according to the motion coordinate system of the cradle type gear milling machine and the gear meshing equation, a tooth surface equation machined through a generating method is constructed; s3, performing grid discretization on the tooth surface of the gear to be machined, and solving the tooth surface equation by adopting a rotary projection method and a genetic algorithm to obtain three-dimensional coordinates of discrete points of the tooth surface of the gear to be machined; s4, establishing a motion coordinate system of the numerical control gear milling machine; carrying out equivalent conversion on the motion coordinate systems of the cradle type gear milling machine and the numerical control gear milling machine to obtain a mapping relation between each motion axis coordinate of the numerical control gear milling machine and the tooth surface discrete points of the gear to be machined; and S5, a thermally induced tooth surface error model is constructed, a tooth surface rotation calibration method is adopted to enable the midpoint of the theoretical tooth surface to coincide with the midpoint of the error tooth surface so as to correct the tooth surface error of the gear to be machined, and an error vector is projected in the normal direction so as to obtain the tooth surface error value of each discrete point.

The utility model relates to a gear and rack meshing type steel ladle plug rod driving device. The device comprises a rack which is arranged on a plug rod sliding rod in the axial direction, and the rack can float in the radial direction of the plug rod sliding rod and / or swing along the axis of the plug rod sliding rod; the driving mechanism comprises a displacement driving mechanism and a gear transmission mechanism, and the gear transmission mechanism is arranged on the radial side of the plug rod sliding rod; the gear transmission mechanism can be driven by the displacement driving mechanism to move in the direction close to the rack, so that a gear in the gear transmission mechanism is meshed with the rack, and the piston rod sliding rod is driven by the gear transmission mechanism to ascend and descend. Through the gear and rack meshing mode, vertical movement of the plug rod sliding rod can be accurately controlled in combination with the displacement driving mechanism, so that opening and closing of the molten steel outlet are accurately controlled, and stability and accuracy of the molten steel pouring amount are guaranteed.

The invention provides a combined flexible gear, a harmonic reducer and a robot, the combined flexible gear comprises a gear ring and a connecting flange, the gear ring comprises a flexible gear cylinder and flexible gear teeth formed on the cylinder wall of the outer side of the flexible gear cylinder, the connecting flange comprises a flange ring and a connecting cylinder located on the end face of one side of the flange ring, and the connecting cylinder is located on the end face of the other side of the flange ring. A first port of the connecting cylinder is in coaxial butt joint with a first port of the flexible gear cylinder, the gear ring and the connecting flange are made of different materials, and the connecting flange is made of high-toughness aluminum alloy materials. Fatigue tearing at the corner position of the connecting flange is avoided, so that the service life of the flexible gear is remarkably prolonged; the gear ring does not have a limiting obstacle of a connecting flange, cutters and clamps with general specifications can be selected in the machining process, and the cost of machining the cutters and the clamps is reduced; as the gear ring and the connecting flange are separately machined, the machining efficiency of the flexible gear can be improved, and the machining difficulty is reduced.

The utility model relates to the technical field of punch forming equipment, and discloses a support punch forming device which comprises a punching table, supporting columns and foot columns are fixedly connected to the top face of the punching table, a lower die base is connected to the tops of the foot columns through bolts, a top plate is fixedly connected to the top ends of the supporting columns, and a connecting plate is fixedly connected to the lower surface of the top plate. The bottom end of the connecting plate is connected with a T-shaped rack through a bolt, the T-shaped rack is connected with a gear in an engaged mode, and a shaft rod is fixedly connected into the gear. A plate is placed on the lower die, the hydraulic cylinder is started to drive the upper die base to move downwards to achieve die assembly stamping, meanwhile, the upper die base moves downwards to drive the fixing block, the shaft rod and the gear to move, under meshing of the T-shaped rack, the gear rotates to drive the shaft rod and the stop rod to rotate, the stop rod sweeps the area between the upper die and the lower die when rotating, and once a hand is located in the dangerous area, die assembly stamping is achieved. And when the operator moves, the operator can be touched by the stop lever made of the flexible plastic material, so that the operator is timely reminded to move away hands, and safety accidents are effectively avoided.

The invention relates to the technical field of computer part machining, in particular to computer part machining equipment which comprises a fixing frame used for bearing a base plate, a machining machine head used for machining the base plate and a machining base used for installing the fixing frame and the machining machine head. A first driving gear ring used for driving clamping in the width direction and a second driving gear ring used for driving clamping in the length direction are arranged at the bottom of a top plate of the fixed frame, the outer wall of the first driving gear ring is meshed with a first clamping plate sliding transversely, and the outer wall of the second driving gear ring is meshed with a second clamping plate sliding longitudinally. And teeth are arranged on the inner sides of the first driving gear ring and the second driving gear ring. The equipment for computer part machining is high in self-adaptive clamping and compatibility, computer substrates of different sizes can be automatically adapted through linkage of the first driving gear ring, the second driving gear ring and the clamping plate, four-side clamping can be completed without manual adjustment, and the adaptation range is wide.

The invention discloses a method for inhibiting fluttering of a thin-wall workpiece based on a follow-up supporting device, which comprises the following steps of: installing the follow-up supporting device, establishing initial normal contact between a rolling wheel in the follow-up supporting device and the back surface of the thin-wall workpiece and applying pre-tightening force to finish initial calibration of a contact state between the follow-up supporting device and the thin-wall workpiece; based on the contact state, a force sensor and a displacement sensor in the rolling wheel are used for collecting normal contact force and displacement signals; the control unit calculates a modal participation coefficient and a dynamic correction function according to the real-time signal to form a time-varying model of equivalent stiffness and damping of the thin-wall part, and a stepping motor in the follow-up supporting device drives a gear-rack mechanism to finely adjust the position of a rolling wheel, so that self-adaptive adjustment of the supporting force is realized; data recording and feedback optimization; and finishing processing and outputting parameters. The device has the advantages of real-time sensing, self-adaptive adjustment, measurable parameters, compact structure and the like, and the machining precision and the surface quality of the thin-walled workpiece are remarkably improved.

In one embodiment, an oral irrigator including a reservoir, a tip fluidly connected to the reservoir, a motor having a drive shaft, and a pump. The pump includes a pump body including a pump inlet fluidly connected to the reservoir and a pump outlet fluidly connected to the tip, a spiral pinion gear including a plurality of pinion gear teeth that curve along their length, and a spiral driven gear including a plurality of driven gear teeth that mesh with the pinion gear teeth. The pump also may include a connecting rod eccentrically connected to the driven gear and a piston and received within the pump body. Movement of the drive shaft causes the pinion gear to rotate, causing the driven gear to rotate, translating the connecting rod and moving the piston laterally within the pump body to pull fluid from the reservoir and push the fluid to the tip.

The invention relates to the technical field of gear tooth measurement, and discloses a gear tooth size rapid measurement device, which comprises a frame, and is characterized in that the top of the frame is provided with a support frame; the servo motor is installed outside the supporting frame, a power output shaft of the servo motor is fixedly connected with a rotating rod, and the outer edge of the rotating rod is slidably connected with a first connecting disc; when a servo motor is driven to drive a rotating rod to rotate, a driving wheel can be matched with a transmission belt to transmit rotating force to a driven wheel, so that a rotating shaft and a cleaning roller can be synchronously driven to rotate, synchronous rotation of a detected gear and the cleaning roller can be further realized, and teeth at different positions of the detected gear can be conveniently detected; the cleaning roller can conveniently clean different positions of the gear to be detected, the air pump is driven to work to convey external air into the rotating shaft through the air pipe, air is blown to the gear to be detected through the air holes, dust on the surface of the gear to be detected can be further blown away, and thorough cleaning is achieved.

The invention discloses a bionic manipulator tail end assembly with a replaceable grabbing part, and relates to the technical field of bionic robots, the bionic manipulator tail end assembly comprises an arm sleeve body, the grabbing part and a convenient-to-replace mechanism; the convenient-to-replace mechanism comprises a limiting assembly, a slot and a plug, the slot is formed in the arm sleeve body, the plug is fixed to the grabbing part, and a limiting hole is formed in the plug; the limiting assembly comprises a support, a guide cavity, a round cavity, a guide rod, a rack, an L-shaped limiting head, a gear motor and a gear, the support is provided with the guide cavity and the round cavity, the guide rod penetrates through the guide cavity, the rack is slidably connected with the guide rod, the L-shaped limiting head fixes the rack and is matched with the limiting hole, the gear motor fixes the support, and the output shaft extends into the round cavity and is provided with the gear meshed with the rack. During working, the gear motor drives the gear rack to drive the L-shaped limiting head to extend into / retreat from the limiting hole, so that the grabbing part is locked / unlocked, and accurate mounting is realized by matching with the positioning convex strip and the groove. The mechanical arm is convenient to replace, reliable in limiting, accurate in positioning, excellent in wear-resisting buffering performance and suitable for the scene where the grabbing part needs to be frequently replaced.

Disclosed is a rack and pinion drive apparatus (100). The rack and pinion drive apparatus (100) includes a pinion (102) provided with a number of pinion teeth (108) such that each pinion teeth of the plurality of pinion teeth (108) comprises a top land (202) and a bottom land (204). A rack (104) provided with a number of rack teeth (106) such that a set of rack teeth of the plurality of rack teeth (106) includes a rack chamfered edge (112). The top land (202) of each pinion teeth of the number of teeth (108) includes a pinion chamfered edge (202A) such that the pinion chamfered edge (202A) is configured to engage with the rack chamfered edge (112) of the set of rack teeth of the number of rack teeth (106) to facilitate meshing of the plurality of pinion teeth (108) with the number of rack teeth (106).

The application discloses a multi-axis linkage automatic fiber placement system and relates to the technical field of carbon fiber automatic fiber placement machines. The second driving part and the third driving part drive the second body rotation and the fiber placement head body rotation through two groups of anti-backlash structures, the anti-backlash structures comprise servo motors, first gears, second gears and third gears, the first gears and the second gears are respectively installed on the output shafts of a pair of servo motors, one side of the first gear teeth is engaged with the third gear, and the other side of the second gear teeth is engaged with the third gear. The application is characterized in that two driving pinions and one driven gear are engaged, one pinion is engaged with the front side of a gear of the driven gear, the other pinion is engaged with the back side of the gear of the driven gear, the servo motors are provided with a start time difference, the gap generated in the process of gear engagement is eliminated, the rotation is stable, and the rotation torque is increased.

The present disclosure relates to a multi-material gear assembly including a first gear including a first material, the first gear defining a plurality of first gear teeth, and a gear shaft configured to support the first gear, the gear shaft being formed of a second material that is different from the first material, and the second material has a higher damping coefficient than the first material.

The invention relates to the technical field of pipeline grinding and welding, in particular to a pipeline groove grinding and welding device which comprises a supporting assembly, an adjusting ring frame, a buckling ring frame, a telescopic assembly, a machining assembly, a grinding assembly and a welding assembly. The adjusting ring frame is in transmission connection with one side of the supporting assembly through a gear and gear ring structure, one end of the adjusting ring frame is hinged to a buckling ring frame, a gear ring is arranged in the middle of the adjusting ring frame, a matching ring is arranged in the middle of the buckling ring frame, and the machining assembly is movably matched with the gear ring or the matching ring to move and provided with a grinding assembly and a welding assembly. Telescopic assemblies are arranged on the two sides of the gear ring and the matching ring correspondingly, and jacking pieces are arranged on the telescopic assemblies in the radial direction of the outer side of the pipeline. By means of the device, pipeline groove grinding and welding procedures can be continuously carried out, meanwhile, alignment work of large-diameter pipelines can be conveniently achieved, the construction procedures are simplified, and the construction efficiency is improved.

The invention provides a rigid gear and a harmonic reducer, and relates to the technical field of harmonic transmission. The rigid gear comprises a rigid gear body and rigid gear teeth; rigid gear teeth are formed on the inner ring face of the rigid gear body. Cooling flow channels used for circulation of cooling media are formed in the rigid gear body and distributed in the circumferential direction of the rigid gear teeth. According to the rigid wheel, the hollow cooling flow channels are formed in the rigid wheel body, the cooling flow channels are directly formed in the rigid wheel and distributed in the circumferential direction of the rigid wheel teeth, the rigid wheel has the advantages of being extremely short in heat transfer path and small in heat resistance, heat can be rapidly taken away from the source, and the service life of the rigid wheel is prolonged. In other words, the heat emitting position can be directly and efficiently cooled from the inside through flowing of the cooling medium, the heat dissipation performance of the harmonic reducer is remarkably improved, and the problem of how to improve the heat dissipation performance of the harmonic reducer in the prior art is solved.