38 results about "Tooth wear" patented technology

The invention discloses a cutting pick wear detection method and system for a heading machine, and relates to the technical field of mining machinery state monitoring, and the method comprises the steps: obtaining a cutting pick tool seat and a tool bit, fixing the tool bit on the tool seat through a plurality of rotating shafts, and arranging a plurality of high-bandwidth acoustic emission sensors on the rotating shafts; identifying a rotation detection signal by using a high-bandwidth acoustic emission sensor, and extracting characteristics such as acoustic emission pulse starting time and peak amplitude; constructing a sound source space positioning model to obtain a sound source positioning result; and mapping a sound source positioning result to the rotating shaft three-dimensional model to identify hidden wear, and outputting a risk level. The technical problems that the traditional detection means is difficult to accurately identify the hidden wear of the heading machine cutting tooth rotating shaft and cannot comprehensively and accurately acquire wear information to meet the accurate evaluation requirement are solved, and the accurate identification and risk grade evaluation of the hidden wear of the heading machine cutting tooth rotating shaft are achieved; and the accuracy and comprehensiveness of cutting pick wear detection are improved.

An apparatus for treating bruxism comprising a main body element, a knob element, and a treatment arm. The main body roughly resembles a flattened golf club head and may have a recess on top, and is connected via the treatment arm to the knob element. The exterior of the apparatus has a smooth construction, with rounded edges lacking sharp corners or points, to assist with placement and comfort. When in use, the main body is placed in the cheek pocket and the treatment arm hooks behind the back molar, where it produces discomfort when fully biting down, thereby discouraging tooth-grinding during slumber.

This invention belongs to the field of oil and gas drilling technology, specifically relating to a PDC drill bit with automatically updating composite cutting discs. It aims to solve the problem of existing drill bits requiring tripping and bit replacement when drilling speed decreases due to tooth wear, thus affecting drilling efficiency. The PDC drill bit with automatically updating composite cutting discs includes a drill bit body, a mounting groove on the drill bit body, and multiple cutting discs arranged side-by-side in the mounting groove. Below the mounting groove is a longitudinally extending output channel communicating with the mounting groove, and adjacent cutting discs are connected in the output channel by a tenon and mortise structure. It also includes a drive device located at the bottom of the drill bit body. During normal drill bit operation, the drive device is pressurized and stores power; when the drill bit is lifted, the drive device applies a downward pulling force to the cutting discs to move them downwards. This PDC drill bit can automatically update the cutting discs during drilling, to a certain extent avoiding tripping due to drill bit wear and improving production efficiency.

The utility model discloses an excavator bucket tooth abrasion testing device which comprises a bottom plate, two conveying frame bodies are fixedly connected to the bottom plate, two second fixing frames are fixedly connected to the bottom plate, third driving motors are fixedly installed on the second fixing frames, and third rotating shafts are connected to output shafts of the third driving motors. The third rotating shaft is rotationally connected with the conveying frame body, a first conveying wheel is rotationally connected to the conveying frame body, the first conveying wheel is connected with the third rotating shaft, a second conveying wheel is rotationally connected to the conveying frame body, and a conveying belt is connected between the first conveying wheel and the second conveying wheel. A third driving motor is controlled to drive a third rotating shaft, a first conveying wheel, a second conveying wheel and conveying belts to rotate, a worker takes down bucket teeth on a first fixing frame for observation, then qualified products and unqualified products are placed on the two conveying belts respectively, the conveying belts can convey the different bucket teeth, and the working efficiency is improved. Therefore, the tested bucket teeth are classified, and the testing efficiency is improved.

The invention relates to a sprocket made of a plastic with at least one sensor for monitoring its wear. The sprocket is particularly characterized by the fact that its wear can be monitored during operation. For this purpose, the sprocket has at least one layer of an electrically conductive plastic, which is incorporated into and / or applied to at least one tooth of the sprocket. The layer(s) is or are connected to a measuring device and / or an electrical voltage source and / or an electrical current source, whereby the layer is or are components of an electrical circuit. The layer is or are arranged such that, at a certain level of tooth wear, the electrical properties of the layer, or at least one of the layers in the electrical circuit, change.The measuring instrument is a component of a data processing system or is connected to a data processing system. Furthermore, the data processing system is connected to at least one data output device.

The invention provides a digital twin tooth surface wear degradation morphology prediction method, which is applied to the field of gear transmission systems, and comprises the following steps: constructing a physical information neural network wear depth prediction model constrained by a gear transient wear model, obtaining a model for predicting a new tooth profile after the gear is worn and a rough morphology model for predicting tooth surface evolution after the gear is worn; a gear wear time-varying meshing stiffness calculation model is constructed, and the corrected wear gear time-varying meshing stiffness is obtained; in combination with a lumped parameter method, a gear system dynamic model is constructed, and a gear wear degradation transmission system simulation dynamic response is obtained; according to the method, the gear bearing supporting rigidity and damping are calibrated, the tooth surface dynamic meshing force is corrected, and finally the corrected tooth surface abrasion depth and the corrected tooth profile and tooth surface morphology are obtained. And interaction of actually measured vibration signals and tooth surface morphology virtual detection in gear box wear degradation is realized.

A manufacturing method of a horizontal rotary edge single chain scraper conveyor interval tooth wear-resistant sprocket, comprising the following steps: designing and calculating various important parameters of the sprocket; machining the sprocket body according to the obtained various important parameters of the sprocket; machining the movable lining plate; assembling and fixing the machined sprocket body and the movable lining plate through bolts; and finishing and heat treating the assembled sprocket assembly. The interval tooth wear-resistant sprocket manufactured by the method has a pitch at the sprocket chain nest which is 3 times the pitch of the round link chain, the interval tooth sprocket can be matched with the conventional round link chain, a variable pitch chain does not need to be designed separately, and the universality of the interval tooth sprocket is improved; the sprocket can provide a larger space to avoid interference with the guide scraper; the upper and lower tooth chain nests of the interval tooth sprocket and the upper surface of the lower tooth are subjected to local induction quenching treatment, and the movable lining plate is arranged on the upper surface of the lower tooth to enhance the wear resistance. The application also provides a horizontal rotary edge single chain scraper conveyor interval tooth wear-resistant sprocket.

The utility model discloses a stirring tooth structure of a granulator, which comprises a stirring tooth seat and stirring teeth, the bottom of the stirring tooth seat is cylindrical, the middle of the stirring tooth seat is in frustum transition, the upper part of the stirring tooth seat is cylindrical, the diameter of the upper cylinder is smaller than that of the lower cylinder, the upper cylinder is processed into internal threads, the stirring teeth are processed by cylinders, and the half-length surface of each stirring tooth is processed into threads. And two sides of the top part are symmetrically processed into slope surfaces with certain angles. The stirring tooth is simple in structure and easy to manufacture, the improved design is carried out on the basis of summarizing the abrasion rule of the stirring teeth, the easily-abraded points of the stirring teeth are effectively avoided on the premise that the stirring and rubbing functions are not affected, the service life of the stirring teeth is prolonged, the replacement and maintenance frequency of the stirring teeth is reduced, and the production efficiency is improved; and the pointed-end stirring teeth are beneficial to generating higher shearing strength, so that the power consumption is lower on the premise of generating the same shearing force.

This invention provides a curable composition for dental restorations that can produce cured products with an excellent balance of flexural strength, fracture toughness, water resistance, polishability, and opposing tooth wear characteristics. [Solution] A curable dental restorative composition comprising a terminally (meth)acryloyl-modified conjugated diene polymer (A), a (meth)acrylic acid ester compound (B) having two or more (meth)acryloyloxy groups (excluding the terminally (meth)acryloyl-modified conjugated diene polymer (A)), an inorganic filler (C), and a polymerization initiator (D), wherein (A) is, for example, one of the following compounds. JPEG2026122851000018.jpg2874 (In general formula (I), R 1 R is a hydrogen atom or a methyl group, 2 is a single bond or an ethylene group, a is 1 or 2, A 1 A is a polymer of a conjugated diene compound or a hydrogenated product thereof, 1 At least one of the ends of the molecular structure is R 2 They combine.

The utility model relates to a dental floss box with an orthodontic dental floss, which solves the technical problem of how to improve the cleaning effect of the dental floss and improve the use convenience and flexibility aiming at teeth wearing a dental appliance, and comprises a box body assembly, a top cover, a blade and a cored orthodontic dental floss coil, the box body assembly comprises a front box body and a rear box body which are connected through a fixing column and a pin, the top cover and the top of the rear box body are integrally formed through an injection molding process, a folding part is arranged at the joint between the top cover and the top of the rear box body, a threading through hole is formed in the top of the rear box body, the blade is connected with the top of the rear box body, and the cored orthodontic dental floss roll comprises orthodontic dental floss and a cylindrical core. The orthodontic dental floss is wound on the cylindrical core to form a roll shape, the cylindrical core is sleeved on the dental floss roll fixing conical column on the inner side of the rear box body, and the orthodontic dental floss is led out from the threading through hole. The toothbrush is widely used for cleaning teeth.

An apparatus for treating bruxism comprising a main body element, a knob element, and a treatment arm. The main body roughly resembles a flattened golf club head and may have a recess on top, and is connected via the treatment arm to the knob element. The exterior of the apparatus has a smooth construction, with rounded edges lacking sharp corners or points, to assist with placement and comfort. When in use, the main body is placed in the cheek pocket and the treatment arm hooks behind the back molar, where it produces discomfort when fully biting down, thereby discouraging tooth-grinding during slumber.

The invention relates to a natural tooth secondary immediate restoration system, which comprises a restoration method, a zirconium oxide restoration body and a digital processing technology thereof, belongs to the field of tooth restoration, and aims to solve the problems of periodontitis and aesthetics incoordination caused by long period and biological width invasion of traditional secondary restoration. According to the technical scheme, the method is characterized in that a symmetric bone margin curve is rapidly established through biological modification in an operation preparation stage and is perpendicular to a prepared tooth body, alveolar bone and gingiva data are obtained through digital scanning, and design, cutting, sintering and neck high polishing treatment (without decorative porcelain) of a zirconium oxide restoration are completed within 12 hours in a technician room. Immediate tooth wearing is realized by using a self-curing bonding material, and indexes are monitored in combination with postoperative reexamination; the dental implant is mainly used for immediate repair of natural teeth, remarkably shortens the treatment cycle, and reduces the chair-side time and the number of times of revival.

The invention discloses a production method and application of toothpaste-grade calcium pyrophosphate, the production method comprises the following steps: mixing calcium hydrophosphate with a magnesium source, heating to 750-830 DEG C at a rate of 4-6 DEG C / min, calcining for 2-4 hours, then carrying out three-gradient cooling on the calcined product, and finally crushing to obtain the toothpaste-grade calcium pyrophosphate, wherein the three-gradient cooling comprises the steps of heating and slowly cooling to 500 DEG C at the speed of 10-15 DEG C / min, then naturally cooling to 100-150 DEG C, and finally cooling to below 50 DEG C at the speed of 3-5 DEG C / min. The prepared toothpaste-grade calcium pyrophosphate is high in beta-phase conversion rate, small in tooth abrasion value, uniform in particle size distribution, excellent in performance when applied to toothpaste grinding materials and wide in application prospect.

The application discloses an excavator track control method and system and an excavator in the technical field of engineering machinery control, and aims to solve the problem that the prior art cannot efficiently, timely and accurately complete the identification and detection of tooth wear, causing the deviation of excavator track control. It comprises the following steps: collecting the posture signals of the boom, dipper arm and bucket of the excavator in real time; obtaining the predicted length of each tooth, collecting the image and point cloud data of each tooth in real time, and calculating the actual coordinates of each tooth in the image; and obtaining the actual length of each tooth according to the actual coordinates of each tooth in the image and the predicted length of each tooth. Even if the camera and laser radar data fail, the tooth wear prediction model still plays a key role in identification and judgment. Through multi-source sensor fusion, comprehensive and accurate data are obtained, and in combination with innovative algorithms, the wear condition of the tooth can be grasped in real time and accurately, and high-precision control of the excavation track is realized.

This invention relates to the field of metal cutting tool technology, and discloses a trapezoidal thread cutting tool with both finishing and compensation functions. The tool includes a tool body and at least one cutting unit disposed on the tool body. The cutting unit includes: a forming tooth with a cutting edge for machining a complete thread shape, the cutting edge including a guide surface bottom arc; and an auxiliary tooth located on one side of the bearing surface of the forming tooth and participating in cutting along with the forming tooth. The auxiliary tooth is spaced from the forming tooth by a full pitch along the tool feed direction, and the auxiliary tooth has a guide surface bottom arc identical in shape and size to the forming tooth. When the forming tooth wears, the auxiliary tooth compensates for and corrects the bottom arc of the thread guide surface during machining. This invention achieves a dual breakthrough in the lifespan and machining quality of a single-tooth trapezoidal thread cutting tool with extremely low additional cost.

The present application relates to surveying instrument calibration technical field, and disclose a kind of high-precision repeated positioning's automatic tightening and loosening prism equipment and method, device includes observation pier, sliding assembly, installation cover, intelligent prism, drive assembly, insertion assembly and auxiliary force component, trapezoidal screw rod of insertion assembly is switched with optical pole section by thread section, so that positioning bolt is in hole before edge transfer side alignment, only circumferential rotation after entering hole, without additional axial thrust;Auxiliary force component is cooperated by electromagnet and tension spring, provides flexible auxiliary force in tooth stage, automatically disengaged after tooth, drive assembly drives trapezoidal screw rod rotation, elastic simply supported beam and strain sensor detect pre-tightening force, sliding assembly realizes accurate limit, the equipment realizes prism automation tightening and loosening, avoids pre-tightening force detection distortion and tooth wear, improves repeated positioning accuracy, stability and operation efficiency, adapts high-precision surveying and mapping and instrument calibration demand.

The rock bucket tooth is of an up-down and left-right symmetrical structure, the rock bucket tooth comprises a tooth plate and a tooth holder which are integrally formed, the tooth holder is arranged at the rear end of the tooth plate, and rib plates connected with the tooth holder are arranged on the upper end face and the lower end face of the tooth plate. A connecting groove is formed in the end face, away from the toothed plate, of the tooth holder, pin holes are formed in the two side walls of the connecting groove of the tooth holder, and side reinforcing bosses are arranged at the positions, where the pin holes are formed, of the outer wall of the tooth holder. The rock bucket tooth disclosed by the utility model is good in wear resistance, high in hardness and good in toughness, so that the bucket tooth of the excavator can work for a long time in a mine rock environment.

This invention relates to the field of geotechnical engineering and foundation construction technology, and discloses an actively adjustable reaming drill bit, drilling tool, and construction method. The reaming drill bit includes a drill bit body, a reaming wing, an inclination adjustment mechanism, and a locking mechanism. The reaming wing is hinged to the drill bit body via a hinge shaft. The inclination adjustment mechanism drives the reaming wing to rotate to adjust the inclination angle of the cutting teeth, and the locking mechanism locks the reaming wing at a preset inclination angle position. This invention solves the problems of low drilling efficiency and rapid tooth wear caused by fixed-angle cutting teeth being unable to adapt to complex and variable strata. It also integrates drilling, wall protection, reaming, and pile driving functions into one unit, resulting in high overall construction efficiency and guaranteed pile quality.

A computer-implemented method for detecting tooth wear on a virtual 3D model (101) of a tooth condition is disclosed. The method comprises: receiving, by a processor, a virtual 3D model of a tooth condition (101); a segmented 3D model is obtained by segmenting the virtual 3D model (101) into a plurality of individual teeth and gums, where the segmented 3D model comprises teeth (102) characterized by age parameters. Furthermore, the method comprises: encoding the teeth (102) from the segmented 3D model into a potential space (302) of the trained neural network (300) to obtain an encoded tooth representation; wherein a potential space (302) of the trained neural network (300) is continuous and comprises a cluster of a plurality of encoded reference tooth representations, where the encoded reference tooth representations are clustered according to their corresponding reference tooth age parameters. Further, the method comprises obtaining an estimated age parameter of the tooth (102) by identifying a cluster of encoded reference tooth representations comprising the encoded tooth representations from the plurality of clusters of encoded reference tooth representations; comparing the estimated age parameter of the tooth (102) with an age parameter of the tooth (102); and detecting the presence of tooth wear on the tooth (102) based on the comparing step. The virtual 3D model is displayed along with the detected tooth wear presence on the tooth (102).

The invention discloses a precision manufacturing method for an integrated structure of a harmonic reducer, and particularly relates to the technical field of harmonic reducer manufacturing, comprising the following steps: S1, process decision and optimization; s2, preparing a gradient material of the flexible gear ring; s3, establishing a reference; s4, rigid wheel cooperative running-in; s5, carrying out collaborative processing by a wave generator; s6, assembly integration and in-place fine adjustment are carried out; s7, pre-tightening solidification and healthy fingerprint implantation; and S8, collecting and associating initial health information. According to the method, random errors caused by part tolerance accumulation are fundamentally eliminated through'digital twinborn model reverse optimization 'and'collaborative running-in based on unified reference', so that key performance indexes of products not only reach a tip level in absolute value, but also are highly consistent in batches, and the product quality is improved. And the contradiction between wear resistance of the tooth part and fatigue resistance of the root part is broken from the material level, and fatigue crack initiation can be obviously delayed, so that the service life of the whole machine stably breaks through and exceeds that of imported same-grade products.

This utility model discloses a mold-closing device for double-fastening utility pole molds, belonging to the technical field of utility pole processing. It addresses the problem that existing technologies require using a utility pole mold for mold closure before pouring cement into the mold. However, current utility pole molds suffer from tooth wear, which reduces the fixing effect of the bolts on the two molds. When there are errors in the placement of the upper and lower molds, the shape of the produced utility poles becomes significantly inaccurate, reducing the working efficiency of the mold-closing device. The device includes a worktable, the lower end of which is fixedly connected to four vertical plates. The outer walls of every two vertical plates are rotatably connected to a housing via bearings. The dimensions of two grooves match the corresponding protrusions. Two insert rods movably pass through through holes on the surface of the worktable and are inserted into their corresponding grooves.

The invention discloses an excavator bucket tooth wear real-time monitoring and residual life prediction method and system, a storage medium and equipment. The excavator bucket tooth wear real-time monitoring and residual life prediction method comprises working load data, vibration signal data and outline image data of an excavator bucket tooth; synchronously transmitting the working load data, the vibration signal data and the outline image data to a cloud processing platform for data preprocessing; generating an image wear score; generating a vibration abnormity score and a load overrun score; and carrying out weighted fusion on the image wear score, the vibration anomaly score and the load overrun score, and calculating the comprehensive wear index of the bucket tooth. And predicting the residual service life of the bucket tooth based on the obtained comprehensive wear index of the bucket tooth. The model accurately predicts the residual life of the current bucket tooth by learning the relationship between the wear index and the final failure in historical data. And maintenance personnel are notified in advance before the bucket tooth is completely invalid, so that secondary damages such as prolonged downtime and bucket foundation part damage caused by breakage of the bucket tooth are avoided.

The utility model discloses ore crushing mechanical equipment, which comprises a crusher main body, a static jaw plate and a movable jaw plate, the static jaw plate and the movable jaw plate are arranged on the inner wall of the crusher main body, a cleaning mechanism is arranged between the static jaw plate and the movable jaw plate, and the cleaning mechanism comprises a first toothed plate and a second toothed plate, a monitoring mechanism is arranged between the first toothed plate and the second toothed plate, the monitoring mechanism comprises an electric telescopic column and a pressure sensor arranged at one end of the electric telescopic column, and the first toothed plate and the second toothed plate are fixedly connected with the pressure sensor through first spring assemblies. According to the ore crushing mechanical equipment, impurities in the jaw teeth are cleaned, meanwhile, the abrasion degree of the jaw teeth is monitored, the jaw plates are convenient to replace regularly, normal use of the static jaw plate and the movable jaw plate is guaranteed, and the high crushing efficiency of a crusher is kept for a long time.

The utility model relates to boot technology field, concretely is waterproof and cold -proof boots, including boot cylinder, bottom plate, heating body and heat -preserving cover, is set up restraint band on boot cylinder, the bottom integrative connection sole of boot cylinder is set up recess on sole, bottom plate sets up antiskid tooth on the bottom of bottom plate, heating body sets up in recess, and aluminium foil pad is set up in recess in the bottom of heating body, and insole is set up on sole in the inside of boot cylinder, heat -preserving cover sets up on the outer wall of boot cylinder, and energy storage battery for supplying power to heating body is set up in heat -preserving cover, and the magnetic attraction flip cover for closing its opening is set up on heat -preserving cover, the utility model discloses that the energy storage and control structure are externally hung on boot cylinder, will not influence walking, and through setting up detachable bottom plate structure, it is convenient for replacing in time when antiskid tooth wears out, and simple operation, and the utility model discloses that heating and heat -preserving structure are additionally increased in sole inside, and it is convenient for foot cold -proof.

The invention provides a high-end terminal connecting piece locking force evaluation method, which comprises the following steps of: acquiring a press-in depth and a contact area during crimping, a terminal deformation quantity and a locking force attenuation amplitude, and establishing a crimping operation record; according to the tooth-shaped side wall stress deviation value and the locking force attenuation amplitude, identifying the tooth-shaped spacing expansion amplitude, recording the tooth-shaped tip end grinding width and the tooth-shaped spacing expansion amplitude under different crimping times, and establishing a tooth-shaped wear record table; the contact area, the terminal deformation quantity, the tooth-shaped tip grinding width and the side wall stress deviation value are integrated, a wear characteristic threshold value is determined, and the tool wear level is determined according to the wear characteristic threshold value; and obtaining real-time crimping frequency records in the crimping equipment, calculating the remaining service life of the remaining tool by combining the tool wear level and the locking effect degradation rate, and generating a tool replacement demand prompt according to the remaining service life of the tool.

The invention relates to the technical field of harvester threshing toothed bars, in particular to a novel harvester threshing toothed bar which comprises a connecting plate, a toothed bar body is arranged on the side face of the connecting plate, a mounting assembly is arranged on the surface of the toothed bar body, an abrasion display assembly is arranged on the left side of the mounting assembly, and an abrasion prompt assembly is arranged on the surface of the mounting assembly. And the abrasion prompting assembly comprises a bottom end connecting ring piece, a screw rod, a threaded sleeve, a nut, a limiting rectangular plate, a limiting ring piece and a rectangular hollow groove, the bottom end connecting ring piece is fixedly connected to the top of the locking nut, and the threaded sleeve is in threaded connection to the surface of the screw rod. According to the novel harvester threshing toothed bar, when the novel harvester threshing toothed bar is used, a limiting ring piece can be set to a certain height by arranging the abrasion prompting assembly, a threaded rod is held for screwing, a threaded sleeve moves up and down along the surface of the threaded rod, and therefore the height of the limiting ring piece is adjusted, and when teeth are abraded to the top of the limiting ring piece, the teeth are limited to further work; and users are forced to replace.

The utility model relates to an implant dental crown part bonding tooth wearing assistor, which comprises a gingival part and a dental crown part, an implant is arranged in the gingival part, a base station is arranged at the top of the implant, screw channels are arranged in the implant and the base station, a through hole is reserved in the dental crown part, and the through hole is communicated with the implant. The dental crown part is installed outside the abutment through a through hole, a space is reserved at the top of the dental crown part and used for being filled with fluid resin, the dental implant further comprises a tooth wearing assistor, the tooth wearing assistor comprises an assistor rubber ring and a connecting part arranged at the bottom of the assistor rubber ring, and a tooth filling material is installed at the bottom of the connecting part. The tooth wearing assistor is used for being inserted into the screw channel and enabling the tooth filling material to be automatically disconnected, the tooth wearing step can be simplified, and the sealing efficiency is improved.

The utility model relates to a cored orthodontic dental floss roll, which solves the technical problem of how to improve the cleaning effect of dental floss, the convenience of use and the flexibility aiming at teeth wearing a dental appliance, and comprises an orthodontic dental floss and a cylindrical core, the orthodontic dental floss is wound on the cylindrical core to form a roll shape, the cylindrical core is made of plastic, and the cylindrical core is made of plastic. The orthodontic dental floss comprises a plurality of cleaning sections, an interval traction section is arranged between every two adjacent cleaning sections, the foremost end of the orthodontic dental floss wound on the cylinder core is a first traction section, the orthodontic dental floss is made of a plurality of strands of nylon long silk threads, the first traction section is formed by encapsulating, the interval traction sections are formed by encapsulating, the diameter of the first traction section is 0.25-0.75 mm, and the diameter of the second traction section is 0.25-0.75 mm. The diameter of the interval traction section ranges from 0.25 mm to 0.75 mm. The toothbrush is widely used for cleaning teeth.

The utility model relates to a dental floss for cleaning teeth, which solves the technical problem of how to improve the cleaning effect of the dental floss and improve the use convenience and flexibility aiming at the teeth worn with tooth correctors, is made of a plurality of strands of nylon long silk threads, and comprises a head traction section, a middle cleaning section and a rear cleaning section, the middle cleaning section is located between the head traction section and the rear cleaning section, the head traction section is provided with a coating glue layer, and the rear cleaning section is provided with a coating guar gum layer. The toothbrush is widely used for cleaning teeth.

The application provides a self-centering honing tool, which comprises a positioning disc, the positioning disc is concentrically arranged on a working base, a clamping device is symmetrically arranged on each side of the positioning disc, each clamping device is provided with an anti-rotation tooth clamping plate and a pressing plate, the clamping surface of the anti-rotation tooth clamping plate is provided with a tooth shape, the tooth shape is engaged with the tooth shape of a gear workpiece, and the pressing plate is arranged above the anti-rotation tooth clamping plate. When the anti-rotation tooth clamping plate clamps the gear workpiece, a gap is formed between the lower end surface of the pressing plate and the upper end surface of the gear workpiece. The application has a reasonable structure design, utilizes the principle of gear engagement, can position the gear workpiece from both sides of the workpiece in the radial direction, effectively positions the center of the gear workpiece, avoids the radial rotation of the workpiece, and reduces the possibility of tooth wear during clamping and machining. Meanwhile, an adjustable floating gap is arranged between the pressing plate and the upper end surface of the gear, and the workpiece can float up and down during machining.