916 results about "Tooth part" patented technology

The utility model discloses a rotary compressor and refrigeration equipment, and relates to the technical field of compressors, the rotary compressor comprises a motor, the motor comprises a stator and a rotor, the stator comprises a stator iron core and a stator winding, the stator iron core comprises an annular yoke part and a plurality of tooth parts arranged in the yoke part, the plurality of tooth parts are spaced along the circumferential direction of the yoke part, and the stator winding is arranged in the yoke part; a stator groove is formed between every two adjacent tooth parts, the stator winding is wound in the stator grooves, and the rotor comprises a rotor iron core; the pump body part comprises a crankshaft, an upper bearing and a cylinder; the number of the stator grooves is Q, the number of poles of the rotor is P, the maximum outer circle contour radius of the rotor core is R1, the maximum outer circle contour outer diameter is D1, D1 = 2 * R1, the outer diameter of the part, matched with the upper bearing, of the crankshaft is D2, GCD (Q, P) is the largest common divisor of Q and P, and GCD (Q, P) is larger than or equal to # imgabs0 # 5 and smaller than or equal to 6. The rotary compressor disclosed by the utility model is beneficial to improving the energy efficiency of the rotary compressor and reducing the electric energy consumption during operation.

The invention discloses a manufacturing method of a frameless torque motor stator core, the stator core comprises a stator yoke part, a stator tooth part and a stator coil, the stator yoke part is in a circular ring shape, the stator tooth part is in a sun tooth type structure, the stator tooth part comprises a circular ring part, a tooth boot part and a tooth body part, the stator tooth part is embedded in the stator yoke part, and the tooth body part is in a sun tooth type structure. The plurality of tooth body parts are uniformly distributed, high-temperature-resistant insulating films are prepared on the surfaces of the stator yoke part and the stator tooth parts, and the stator coils are arranged on the peripheral sides of the tooth body parts in a sleeving manner; the manufacturing method comprises the following steps: S100, manufacturing the stator yoke part and the stator tooth part, and carrying out coating treatment; s200, winding to form a stator coil; s300, assembling a stator iron core; s400, welding a wire pin; s500, pouring glue and drying; s600, boring and shaping: boring the inner side of the circular ring part and the solidified potting glue, and boring off the circular ring part, so that two adjacent tooth shoe parts are completely isolated, and the closed slot of the stator core is bored to form an open slot; and S700, carrying out performance detection.

The invention discloses a stator assembly, a compressor and refrigeration equipment, and relates to the technical field of motors. The stator assembly comprises a stator core formed by stacking a plurality of amorphous alloy sheets, the stator core comprises a yoke part, a tooth part and a shoe part, and the stator core is formed by stacking a plurality of amorphous alloy sheets, so that the iron loss of the stator assembly can be reduced. For a motor, the area of a stator slot is expected to be as large as possible to increase the winding wire diameter so as to reduce copper loss, and the smaller the minimum width of a tooth part is, the better is, but the smaller the width of the tooth part is, the more likely to cause magnetic field saturation. In order to reasonably design the minimum tooth width of the tooth part so as to reduce the problem of magnetic voltage drop increase caused by magnetic field saturation, the minimum tooth width Wt of the tooth part is set in a range of 2piD / 9Q to 2piD / 3Q, so that the area of the stator slot can be effectively increased, the problem of magnetic voltage drop increase caused by magnetic field saturation can be improved, the magnitude of current can be reduced, and the service life of the stator slot can be prolonged. The working efficiency of the motor is improved.

The invention discloses a formed milling cutter tool system for machining a jaw and a machining method. The formed milling cutter tool system comprises a formed milling cutter. The forming milling cutter comprises a milling cutter disc body, a cutter shaft mounting hole formed in the position of the central axis of the milling cutter disc body, a plurality of composite-shape cutting teeth arranged on the outer circle of the milling cutter disc body and arranged at intervals in the circumferential direction, and tooth grooves formed between every two adjacent composite-shape cutting teeth in the circumferential direction. The composite-shaped cutting teeth are provided with shovel rear angles in the circumferential direction. Each composite-shape cutting tooth comprises a main cutting tooth part, a transition cutting tooth part and an auxiliary cutting tooth part which are adjacently connected in the axial direction, and each main cutting tooth part comprises a section of sawtooth-shaped dense teeth, a section of sawtooth-shaped comb teeth and a section of linear teeth which are adjacently connected in sequence in the axial direction; a special milling cutter for dense tooth part machining and a dense tooth part on-line strong cold abrasion monitor are further arranged in a matched mode. The invention provides a systematic solution integrating a special cutter, online wear monitoring and auxiliary forced cooling.

The invention discloses a rapid punch forming process and die based on multiple stations. The die comprises a workbench, an upper die, a lower die, a driving assembly and a combined driving mechanism. The air cylinder drives the lower die to ascend and descend and suck blanks in a vacuum mode, the motor drives the upper die to conduct stamping, the dies are locked during stamping and accurately rotate by 90 degrees to switch stations during resetting by means of differential meshing of a groove and a plane of a tooth part, and finished products fall into a collecting box after being demolded through gravity. The problems of insufficient station switching precision, action interference and low automation degree of a traditional multi-station mold are solved, full-process automatic linkage of adsorption, punching, rotation and demolding is achieved through cooperation of pneumatic and magnetic attraction assemblies, and manual intervention is avoided. The four-station continuous punching machine has the characteristics of four-station continuous machining, motion interlocking interference prevention, accurate positioning, high efficiency and stability, the mass production efficiency and the finished product percent of pass are remarkably improved, and the four-station continuous punching machine is suitable for high-speed punching forming in the fields of automobile parts, electronic elements and the like.

The invention provides an invisible orthodontic appliance assembly and a mounting method and application thereof, the invisible orthodontic appliance assembly is used for treating twisted teeth, and the invisible orthodontic appliance assembly comprises an invisible orthodontic tooth socket at least comprising a twisted tooth part, a first adjacent tooth part and a second adjacent tooth part; a local grinding area is arranged at the torsion tooth part, and the surface of the torsion tooth is exposed; the torsion tooth correction assembly comprises a self-ligating bracket, a first arch tube, a second arch tube and an arch wire, wherein the self-ligating bracket is fixed on the surface of a torsion tooth; the first arch tube is arranged on the surface of the first adjacent tooth part, and the second arch tube is arranged on the surface of the second adjacent tooth part; the arch wire comprises a fixed end and a free end, the fixed end is fixed in the first arch tube, and the free end is accommodated in the second arch tube; the middle part of the arch wire is fixed in the self-ligating bracket to form a locking state, and the resilience force generated by the deformed arch wire is used for correcting the twisted teeth. Through the synergistic effect of the invisible orthodontic tooth socket, the self-ligating bracket, the arch tube and the arch wire, efficient orthodontic of twisted teeth is realized.

The utility model relates to a disc type axial motor, comprising a rotor which comprises a rotor iron core and magnets which are respectively arranged on the front side surface and the rear side surface of the rotor iron core and are arranged along the circumferential direction of the rotor iron core; the stator comprises a stator iron core, a tooth part which is arranged on one side surface of the stator iron core and is arranged along the circumferential direction of the chassis, and a coil which is arranged on the tooth part; the two stators are arranged on the front side and the rear side of the rotor respectively, and the tooth parts face the rotor. According to the disc type axial motor provided by the utility model, through the stator-rotor-stator design, the magnetic field of the motor is optimized, the energy density is high, and the rated torque can reach 2.3 Nm in a motor with the diameter of 90mm. And the effects of reducing the size and increasing the energy density are achieved, and the market requirement of the robot is met.

The utility model relates to a cleaning equipment brush head, cleaning equipment and a cleaning system. The cleaning equipment brush head comprises a main body part; the rolling brush is arranged on the main body part and can rotate relative to the main body part; the comb teeth are installed on the main body part, each comb tooth comprises a plurality of tooth parts arranged in the first direction, and a first acute angle is formed between the extending direction of at least part of the tooth parts and the first direction; wherein the first direction is the axis direction of the rolling brush. The brush head of the cleaning equipment has better anti-winding capability.

The invention relates to the technical field of precision transmission and robot joints, and particularly discloses a sensor integrated intelligent harmonic reducer and a flexible robot joint system.The sensor integrated intelligent harmonic reducer comprises a rotating shaft, a wave generator, a flexible wheel assembly, a steel wheel assembly, a bearing pack and an integrated sensor module; the rotating shaft is used for being connected with a motor output shaft; the wave generator comprises a cam part and a mounting part; the flexible wheel assembly comprises a flexible wheel and a mounting disc, the flexible wheel is provided with a thin-wall tooth part, a thick-wall tooth part and a rigid connecting part, and the thick-wall tooth part and the rigid connecting part are in transition connection to the two sides of the thin-wall tooth part respectively; the steel wheel assembly comprises a rigid wheel, an inner gear and a flange plate. The bearing pack comprises a first flexible bearing, a second flexible bearing and a rigid bearing which are arranged in the axial direction of the rotating shaft, and the rigid bearing is located between the first flexible bearing and the second flexible bearing; and the integrated sensor module is arranged on the thick-wall tooth part or the rigid connecting part of the flexible gear assembly.

The invention provides a permanent magnet journal sticking axle generator, which mainly comprises a stator and a shaftless rotor, and is characterized in that the stator mainly comprises a stator iron core and a winding; the shaftless rotor mainly comprises a rotor iron core, magnetic steel and a rotor support, the stator iron core is composed of a plurality of stator tooth iron core modules which are connected end to end, and stator tooth windings are wound on the stator tooth iron core modules; the rotor core is composed of a plurality of rotor core modules which are mutually connected end to end, magnetic steel is arranged in each rotor core module, the rotor support is of a split structure, and the rotor core is arranged on the outer circumferential surface of the rotor support. According to the invention, each tooth of a stator core is made into an independent stator tooth core module, and each stator tooth core module is wound with a stator tooth winding; and the rotor iron core is also manufactured into a modular structure in which each tooth part is on a rotor iron core module, so that convenience is provided for assembling, disassembling and hoisting the generator in a narrow space.

The invention discloses a stator core, a stator, a motor and a vehicle, the stator core is provided with a stator yoke part and a plurality of stator tooth parts, the plurality of stator tooth parts are connected with the stator yoke part and are distributed along the circumferential direction of the stator yoke part, the end face of the stator yoke part is provided with a plurality of first oil injection holes and a plurality of second oil injection holes, and the first oil injection holes and the second oil injection holes are distributed along the circumferential direction of the stator yoke part. The plurality of first oil injection holes are distributed along the circumferential direction, the plurality of second oil injection holes are distributed along the circumferential direction, the plurality of second oil injection holes are arranged around the periphery of the plurality of first oil injection holes, and the oil injection directions of the plurality of first oil injection holes and the plurality of second oil injection holes are inclined towards the stator tooth part. According to the stator iron core provided by the embodiment of the invention, the plurality of first oil injection holes are matched with the plurality of second oil injection holes, so that the cooling oil can be directly injected to the winding, the oil is injected to different positions of the winding, the contact area between the cooling oil and the winding is increased, and the heat dissipation effect on the winding is improved.

A method of making a teeth-only, gingiva-free dental restoration device for a full-arch dental replacement of a replacement arch of a patient may include using a computing device for: receiving a model of a replacement arch of a patient having post-extraction tooth sockets defined by a substantially original interdental and interradicular ridge of the patient; generating a model of a teeth-only, gingiva-free dental restoration device having individual replacement teeth portions each having a tooth axis extending between a gingival section and an incisal / occlusal section; designating individual replacement teeth portions to include abutment holes based on a location in the model of the replacement arch of straight implants secured within corresponding post-extraction tooth sockets; modifying at least one of a location, shape, and size of one or more of the teeth portions; and outputting information regarding the model for fabricating a teeth-only, gingiva-free dental restoration device.

A door opening and closing device according to one embodiment comprises: a driving unit; and a link gear rotating forward or backward with respect to a rotation center in accordance with an operation of the driving unit. A tooth part connected to the driving unit is provided on one side of the link gear with respect to the rotation center, and a coupling unit coupled to a link pushing a door is provided on the other side of the link gear with respect to the rotation center. A first distance between the rotation center and the coupling unit is greater than a second distance between the rotation center and the tooth part.

The utility model relates to the technical field of daily hardware fittings, in particular to a single-tooth hinge. The single-tooth hinge comprises a first auxiliary rod, a second auxiliary rod, a supporting rod and a base. The supporting rod is rotationally connected with the first auxiliary rod and the second auxiliary rod. The second auxiliary rod is provided with a second rotating shaft, and the first auxiliary rod is provided with a first rotating shaft; a single-tooth structure is further arranged between the end of the first auxiliary rod and the base and comprises a single-tooth part arranged on the first auxiliary rod and a protruding part arranged on the base and clamped into the single-tooth part. Due to the fact that only one single-tooth part and one protruding part are arranged, compared with a structure with multiple tooth parts, the damage probability is greatly reduced, the use frequency is improved, long-term stable push-pull operation is ensured, and due to the fact that the single-tooth structure is relatively simple, maintenance and repair are relatively easy.

The invention discloses a workpiece disc feeding device and a feeding method applying the workpiece disc feeding device, and the feeding device achieves automatic and continuous feeding through a rack integrated lifting mechanism, a double-layer conveying unit and a gear connection mechanism. The lifting mechanism carries a plurality of sets of independently-driven storage conveying units, the feeding conveying unit is arranged in front and driven by a single power piece, and the operation arm carries a connection gear which can be selectively meshed with a storage unit driving shaft or a feeding unit driving shaft. When the connection gear is meshed with the first tooth part of the material storage unit, a power transmission link is formed, so that the material storage workpiece disc is forwards conveyed to the feeding unit; and after disconnection, the lifting mechanism can switch the material storage layer position, and meanwhile, the transferring mechanism transfers the workpiece to the next station. According to the device, a gear connection structure is innovatively adopted to achieve power reuse, full-process linkage of storage switching, workpiece conveying and station transferring can be completed only through a single power source, the feeding efficiency is remarkably improved, and the equipment cost is reduced.

The invention provides an anastomat body and an anastomat. The anastomat body comprises a first gear, a rotating head, a second gear and a power assembly. The first gear includes a first tooth portion. The second gear includes a second tooth portion engaged with the first tooth portion. The rotating head is connected with the nail bin assembly. The staple cartridge assembly comprises a jaw and a cutting knife. The power assembly drives the first gear to rotate, and the first gear drives the second gear to rotate. The rotating head defines a containing space, and at least part of the second gear is located in the containing space and connected with the rotating head so as to drive the rotating head to rotate. The rotating head drives the nail bin assembly to circumferentially rotate around the center shaft of the nail bin assembly. Circumferential rotation of the nail bin assembly is controlled in an electric mode, operation is convenient, and the operation precision and efficiency of an operation are improved.

The utility model relates to the technical field of universal joint connection, and discloses a light-weight end tooth structure universal joint easy to align teeth, which comprises a rotation axis of the universal joint and an end tooth disc rotating around the rotation axis of the universal joint, a plurality of tooth parts are arranged on the end tooth disc along the rotation axis in a central symmetry manner, and the tooth parts are arranged on the end tooth disc. The tooth part comprises a tooth bottom arranged on the end-toothed disc, a tooth top is arranged at the top of the tooth bottom, symmetrical first tooth surfaces are arranged at the two opposite side ends of the tooth bottom, and symmetrical second tooth surfaces are arranged at the two opposite side ends of the tooth top. The second angle formed by the two second tooth surfaces on the tooth top is configured to be larger than the first angle formed by the two first tooth surfaces on the tooth bottom, the meshing tolerance range between the tooth parts is enlarged through the design, larger tooth alignment tolerance is allowed in the assembling process, and therefore the axial alignment operation of the gear and a matched piece is simplified, and the assembling efficiency is improved. And the adjustment frequency during assembly is reduced.

The invention relates to the technical field of display screen detection, in particular to a visual detection device for brightness uniformity of a display screen. Comprising a rack, a transmission system installed on the rack and a rotating frame rotating intermittently, a feeding and discharging station, a vibration detection station, a shaking detection station and a pressing detection station are arranged on the rack in the clockwise direction, and four screen clamping systems are arranged on the rotating frame. The screen clamping system comprises a cradle, a transmission wheel rotationally connected to the rotating frame, a vibration detection frame slidably connected to the rotating frame and a rack plate installed on the vibration detection frame, three sector tooth sections and three empty tooth parts are alternately arranged on the transmission wheel, the three sector tooth sections are alternately meshed with the rack plate, and the central angles of the sector tooth sections are different from one another. The device has the beneficial effects that aiming at the problem that a traditional detection device cannot simulate composite working conditions of vibration, swing and pressing and causes missing detection of hidden defects, a collaborative link of defect pre-excitation, full-dimensional capture and dynamic verification is constructed through a three-station linkage design of vibration detection, shaking detection and pressing.

The utility model discloses a permanent magnet synchronous motor which comprises a rotor, a stator and a rotating shaft, the rotating shaft is arranged at the circle center of the rotor in a penetrating mode, the rotor is embedded in the stator, the middle section of a tooth portion of the stator is arranged in an arc shape, the two ends of the tooth portion of the stator are arranged in a flat cutting mode, and air gaps of the stator and the rotor are arranged in an uneven mode. The permanent magnet synchronous motor comprises a rotor and a stator, the outer circle of the rotor is of a two-section chamfering structure, permanent magnets of a V-shaped structure are arranged in the rotor, and the permanent magnets are distributed at intervals in the circumferential direction of the rotor, according to the permanent magnet synchronous motor, the pole-arc coefficient and the effective air gap length of the motor are adjusted through the outer circle shape of the rotor and the tooth tip shape of the stator, and therefore the motor efficiency is improved. Therefore, the air gap flux density harmonic amplitude is reduced, and the cogging torque and the torque ripple of the motor are reduced.

The invention provides a process tank device and semiconductor process equipment, the device comprises a process tank body with a top opening and a tank cover assembly, the tank cover assembly comprises a tank cover main body for opening and closing the top opening and a comb tooth structure arranged on the tank cover main body, the comb tooth structure is provided with a plurality of tooth parts arranged in the first direction and tooth grooves located between every two adjacent tooth parts. Under the condition that the groove cover main body covers the top opening, each tooth groove is used for correspondingly accommodating the top of each wafer in the process groove body; moreover, the tooth parts and the tooth grooves are used for guiding bubbles in liquid contained in the process tank body to the two sides of the comb tooth structure in the second direction, and the first direction and the second direction are perpendicular to each other and are both parallel to the horizontal plane.

The utility model relates to an anti-backlash damping planetary gear transmission device in the technical field of planetary gear transmission, which comprises a sun gear, a planet carrier, a plurality of planetary gears and an inner gear ring, the plurality of planetary gears are arranged on the planet carrier in a staggered way, so that the front side surfaces of the tooth parts of part of the planetary gears are in contact with the tooth parts of the inner gear ring in the transmission process; the reverse side surfaces of the tooth parts of the other part of planetary gears are contacted with the tooth parts of the inner gear ring; when the sun gear is driven in the forward direction or the reverse direction, at least part of the planetary gears are meshed with the sun gear and the corresponding front face or the corresponding reverse face of the inner gear ring all the time, and therefore the purposes of eliminating backlash of a gear set, restraining vibration and reducing noise are achieved.

The utility model discloses a linear motor, which comprises a stator and a rotor, and the stator or the rotor comprises an iron core, a coil winding and a cooling pipe. The iron core comprises a yoke part and a plurality of tooth parts arranged on the yoke part. The coil winding comprises a plurality of coil units which are wound on the tooth parts respectively, and each coil unit comprises at least two layers of sub-coil units which are arranged at intervals in the extending direction of the tooth parts from the yoke part. The cooling pipe comprises a cooling section wound around the tooth part, and the cooling section is located between the two adjacent layers of sub-coil units of each coil unit and makes heat conduction contact with the two adjacent layers of sub-coil units. At least one of the opposing surfaces of the sub-coil unit and the cooling section is configured to have a planar extension. The enameled wire and the cooling pipe of the coil winding adopt a flat design, so that the heat exchange area of the enameled wire and the cooling pipe is increased, and the heat dissipation efficiency of the linear motor is improved.

The utility model discloses a strain clamp with stable connection, which comprises a clamp body, two inner sides of the clamp body are provided with clamping pieces, the clamping pieces are provided with pushing blocks, the pushing blocks are fixedly connected with the clamp body through screws, the clamping pieces are provided with threading holes for accommodating wire groups, and the threading holes are connected with the clamping pieces through screws. The wire clamp body is provided with a plurality of wire penetrating holes, the wire penetrating holes are provided with a plurality of clamping plates at equal intervals from left to right, the inner walls of the clamping plates are provided with a plurality of tooth parts protruding at equal intervals, and springs are arranged in the clamping pieces and act on the two ends of the clamping plates so that the clamping plates can move towards the middle of the wire clamp body. The tooth part is embedded into the outer wall of the wire group, so that the friction force is enhanced; the clamping force of the clamping plate is dynamically adjusted by pushing the clamping plate through the spring according to the real-time change of the diameter of the wire set, so that the tooth part is always kept in close contact with the outer wall of the wire set, the phenomena of connection loosening and loosening are effectively prevented, and the connection stability of the wire clamp body and the clamping plate is further improved through the screw.

The invention discloses an electric driving system and a vehicle, and the system comprises a driving motor which comprises a motor body and a motor shaft, and the output end of the motor shaft is provided with a motor shaft gear; the duplex gear shaft comprises a duplex gear shaft first tooth part and a duplex gear shaft second tooth part which are arranged at an interval; a duplicate gear, a synchronizer, an output gear and output shaft teeth are sequentially arranged on the output shaft at intervals, the duplicate gear and the output gear are both arranged on the output shaft in an empty sleeving mode, a duplicate gear first tooth part of the duplicate gear is meshed with the motor shaft gear, and a duplicate gear second tooth part of the duplicate gear is meshed with a duplicate gear shaft first tooth part; the output gear is meshed with the second tooth part of the duplicate gear shaft, and the synchronizer is arranged between the second tooth part of the duplicate gear and the output gear in a sliding mode and selectively combined with the second tooth part of the duplicate gear and the output gear when driven; and the differential mechanism is meshed with the output shaft teeth through the main reduction gear. Through the double-path transmission mechanism, the flexibility of speed ratio design is realized, and the double-path transmission mechanism has the advantages of compact structure and light weight.

This invention discloses an automated anterior tooth feature parameter extraction method and evaluation system based on computer vision, comprising: acquiring and visualizing a full-mouth scan image of a patient to be processed; cropping the corresponding tooth portion image; using Gaussian blur to eliminate specular reflection; using color segmentation to set thresholds for the H, S, and V channels respectively; separating the teeth and gingiva in each tooth portion image and performing morphological processing on each; extracting the tooth and gingiva portion contours using contour extraction methods; further refining the segmentation accuracy using the Chan-Vese active contour model algorithm and the energy function within the tooth portion contour; extracting corner points using the Shi-Tomasi corner detection method and then clustering them; extracting other important evaluation feature points through curve fitting and extreme value finding methods; and finally calculating relevant objective indicators for tooth evaluation and automatically generating the corresponding tooth score, thus completing the automated anterior tooth evaluation.

The invention provides a roller, a driving device and a preparation method thereof.The roller comprises a threaded section, a first tooth part and a second tooth part, the threaded section is located between the first tooth part and the second tooth part, the first tooth part comprises first teeth, the first tooth part is provided with first tooth grooves in the circumferential direction of the roller, and the second tooth part is provided with second teeth in the circumferential direction of the roller; the first tooth part comprises a first tooth, the first tooth part comprises a first tooth and a second tooth, the first tooth groove is located between two adjacent first teeth, the second tooth part comprises a second tooth, the second tooth part is provided with a second tooth groove in the circumferential direction of the roller, and the second tooth groove is located between two adjacent second teeth; the first teeth and the second teeth are arranged in a staggered mode in the axial direction of the pin roller. The requirement on machining precision is reduced; the driving device comprises a shell, a driving assembly and an output assembly, at least part of the driving assembly is located in the shell, the driving assembly is connected with the output assembly, the output assembly comprises a sleeve, a pin roller and a lead screw, the sleeve is in threaded fit with the pin roller, the pin roller is in threaded fit with the lead screw, and the pin roller is in threaded fit with the lead screw. And according to the preparation method, a mold is adopted, forming, demolding and other processes are carried out, the pin roller is formed, demolding is convenient, and the machining precision requirement is lowered.

A thread rolling plate for producing self-tapping and self-locking screws comprises a main thread plate and an auxiliary thread plate. Working faces are arranged on the main tooth plate and the auxiliary tooth plate, and each working face is provided with a collecting part and a shaping part. The shaping part is provided with a high thread groove, a low thread groove, an upper square tooth groove and a lower square tooth groove. Thread rolling edges are arranged between the high thread grooves, the upper square tooth groove comprises a first tooth groove and a second tooth groove, and the lower square tooth groove comprises a third tooth groove and a fourth tooth groove. The high thread grooves and the low thread grooves are formed in the working face, two kinds of threads with different heights are formed at a time, and the self-locking performance of the screw is enhanced. The upper square tooth groove and the lower square tooth groove form a first self-locking block, a second self-locking block, a third self-locking block and a fourth self-locking block in the tooth rolling process, and the self-locking performance is improved. The sharp tooth groove and the flower tooth part are arranged on the main tooth plate, so that the cutting and chip removal performance of the screw is improved. The thread rolling plate can be used for machining screws with threads of various functions and specifications under one-time thread rolling, and the machining efficiency is greatly improved.

The application discloses a machining method for a large-length-diameter-ratio shaft tooth part, which comprises the following steps: removing excess material from a forging blank; performing heat treatment and quenching and tempering to obtain a quenched and tempered blank; straightening the quenched and tempered blank; performing annealing stress relief treatment on the straightened blank to obtain an annealed blank; performing rough grinding on the outer circle of the annealed blank to obtain a ground blank; clamping and fixing the ground blank on a clamping mechanism to perform rough turning to obtain a rough blank; pre-grinding the rough blank to a target size; clamping and fixing the rough blank on the clamping mechanism to perform finish turning, and thus the large-length-diameter-ratio shaft tooth part is obtained. The machining method reduces the deflection of the large-length-diameter-ratio shaft tooth part to the maximum extent, effectively solves the technical problems of low qualified rate, high production cost and machining precision failing to meet product requirements in the machining of the large-length-diameter-ratio shaft tooth part, effectively enhances the rigidity of the large-length-diameter-ratio shaft tooth part, and effectively reduces the research and development cost of enterprises.

The utility model relates to a massage mechanism which comprises a massage execution unit, the massage execution unit comprises a transmission shaft and a left / right massage plate, the left / right massage plate is connected to the transmission shaft, the massage mechanism further comprises an adjusting unit used for adjusting the distance between the left / right massage plate, and the massage mechanism comprises a shell, an adjusting driving component, a transmission component and a left / right external member. The transmission part is provided with a main transmission part, a left transmission tooth part and a right transmission tooth part; the main transmission part is in transmission fit with an output shaft of the adjusting driving part; the transmission shaft is sleeved with the left / right sleeve piece, the left / right sleeve piece is provided with a left / right sleeve piece gear and a left / right sleeve body, the left / right sleeve piece gear is meshed with the left / right transmission tooth part, the left / right sleeve body is matched with the shell through a left / right hand thread, and the left / right sleeve body is connected with the left / right massage plate. The distance between the left massage plate and the right massage plate can be adjusted, massage comfort is improved, the structure is simple and compact, and adjustment is convenient.