66 results about "Structure tooth" patented technology

Provided is a herringbone planetary gear transmission device with a constant meshing characteristics constructed tooth pair, which relates to the technical field of gear transmission. The transmission device includes a sun gear with a constructed tooth pair, a planetary gear with a constructed tooth pair and an internal gear with a constructed tooth pair based on conjugate curves. Normal tooth profiles of the gears with a constructed tooth pair in the present disclosure are all the same combined curve and can be machined by using the same cutter. A common normal at an inflection point or a tangent point of the curve passes through a pitch point of a meshing gear pair, and a sliding ratio of the meshing gear pair is adjusted according to an adjusted position of the inflection point or the tangent point. A contact ratio of the meshing gear pair is designed as an integer.

The invention provides a swing gas transmission mechanism based on a metal tube spring. The swing gas transmission mechanism comprises the metal tube spring, a tooth-shaped supporting structure and a tooth comb support. A plurality of supporting columns of the tooth comb bracket are arranged along the circumferential direction; tooth-shaped supporting structures protruding outwards in the radial direction are distributed on a supporting column of the tooth comb support in the axial direction. Gaps exist between the tooth-shaped supporting structures in the axial direction, and the metal tube spring penetrates through the gaps and is supported. The metal tube spring is of a hollow structure and is provided with an inlet and an outlet. The metal pipe spring is provided with a spiral pipeline part, and the spiral pipeline part is arranged on the outer side of the tooth comb support in a surrounding mode through the gap. The invention provides a structural combination of a single metal spiral pipeline and a comb-shaped support, and the process difficulty of multi-pipe binding and winding is reduced.

Provided is an external meshing cylindrical gear pair with a constant meshing characteristics constructed tooth pair. The external meshing cylindrical gear pair with a constructed tooth pair includes a cylindrical gear I with a constructed tooth pair and a cylindrical gear II with a constructed tooth pair based on conjugate curves. In the present disclosure, normal tooth profile curves of the cylindrical gear I with a constructed tooth pair and the cylindrical gear II with a constructed tooth pair are continuous combined curves with the same curve shape, which facilitates machining by the same cutter. A common normal at an inflection point or a tangent point of the continuous combined curve passes through a pitch point of the gear pair, and a position of the inflection point or the tangent point can be adjusted according to an actual demand. A contact ratio is designed as an integer.

The invention provides a pressing block type oscillating tooth chain wheel assembly. A plurality of tooth grooves are evenly formed in the middle of a chain wheel shaft in the circumferential direction, and a plurality of first fixing holes are formed in the groove bottoms of the tooth grooves; a plurality of second fixing holes are uniformly formed in the chain wheel shaft at the two ends of the tooth grooves; the top of each tooth row is of a chain nest structure, the tooth rows correspond to the tooth grooves in a one-to-one mode, a plurality of third fixing holes are formed in the tooth rows, the tooth rows are arranged in the corresponding tooth grooves in an inserted mode, the two ends of each tooth row extend out of the corresponding tooth grooves, the pressing blocks are arranged between the adjacent tooth rows respectively, fourth fixing holes are formed in the pressing blocks, and the side walls of the pressing blocks abut against the side walls of the adjacent tooth rows. According to the chain wheel assembly, by arranging the tooth grooves and the tooth rows, the tooth rows are detachably connected, when the chain wheel assembly needs to be maintained, only the damaged tooth rows need to be replaced, the maintenance and repair time of the chain wheel assembly is greatly shortened, meanwhile, by arranging the pressing blocks, the tooth rows can be fixed to the chain wheel shaft more firmly, and the service life of the chain wheel assembly is prolonged. And the overall strength of the chain wheel assembly is greatly improved.

The heat exchange tube comprises a tube body, a plurality of tooth structures spirally extending in the length direction of the tube body are arranged on the inner circumferential wall of the tube body, the tooth structures are arranged in the circumferential direction of the tube body at intervals, the ratio of the tooth number of the tooth structures to the tooth height of the tooth structures is 1000-2590.7, and the outer diameter of the tube body is 6.8-7.5 mm. According to the heat exchange tube, the tooth structures spirally extending in the length direction of the tube body are arranged on the inner circumferential wall of the tube body, the multiple tooth structures are arranged in the circumferential direction of the tube body at intervals, and for the heat exchange tube with the outer diameter of the tube body being 6.8 mm-7. 5 mm, the ratio of the tooth number of the tooth structures to the tooth height of the tooth structures is 1000-2590.7; the pressure drop of the heat exchange tube can be reduced, the flow path can be simplified under the condition that the heat exchange performance is not changed, and the complexity of the manufacturing process is reduced.

The present invention discloses a method for processing a slider groove of a synchronizer gear sleeve, wherein the inner wall of the synchronizer gear sleeve is provided with a plurality of normal teeth and parallel teeth, and the method for processing the slider groove of the synchronizer gear sleeve comprises the following steps: obtaining the position of the parallel teeth; selecting the normal teeth beside the parallel teeth as the target teeth according to the position of the parallel teeth; taking the target teeth as the starting cutting position, cutting the inner wall surface of the synchronizer gear sleeve with preset cutting parameters to form a slider groove; wherein the preset cutting parameters include preset tool running trajectory parameters. The processing method provided by the present invention can realize continuous cutting processing of the slider groove of a gear sleeve with complex structure, and has high processing efficiency and high processing precision, and meets the processing technology requirements.

The application discloses a manufacturing method of a multi-material combined gear and the combined gear, and the manufacturing method of the multi-material combined gear comprises the following steps: preparing a base body; manufacturing the base body by using a first material, and the base body is provided with a mounting part; preparing a tooth part; manufacturing the tooth part by using a second material, the hardness of the second material is greater than that of the first material, the tooth part is provided with a matching part, and the outer periphery of the tooth part is provided with a tooth; and assembling and fixing; after the base body and the tooth part are prepared, the matching part is sleeved on the mounting part and is in interference fit with the mounting part, so as to fix the tooth part and the base body. The gear is divided into two parts of the tooth part and the base body and is manufactured by using different materials, the problem that a multi-step structure gear is difficult to form is solved, and the mechanical properties of each part of the gear are optimized, the combined design not only realizes the demand of the complex structure design of the gear, improves the hardness and wear resistance of the tooth part, and enhances the stability and reliability of the overall structure.

The utility model belongs to the technical field of gear columns, and particularly relates to a driven gear column which comprises a mandrel. The tooth-shaped structure is movably arranged on the outer side wall face of the core shaft, the tooth-shaped structure can be replaced and maintained after the tooth-shaped structure is abraded, the core shaft is reserved for continuous use, and therefore the use cost can be reduced.

The present invention provides a wet cutting head or cutting drum assembly with a detachable tooth seat, which belongs to the technical field of accessories for cutting devices of coal mining machinery, and includes a conical cutting tooth, a conical tooth seat, a dust reduction connection seat, a fixed block and a cutting head or cutting drum; the conical cutting tooth includes a shank, a tooth shoulder, a tooth rod and a conical part; the shank and the tooth rod are both cylindrical structures; the tooth shoulder is a truncated cone structure, the bottom surface is connected to the shank, and the top surface is connected to the tooth rod through an annular transition surface; the conical part is located on the tooth rod, and a hard alloy is brazed on the top, and a plurality of oval anti-bending beams are evenly arranged on the circumferential surface; a mounting hole is arranged on the conical tooth seat, and a quick-insertion tenon is arranged at the bottom; the dust reduction connection seat is provided with an insertion slot, a water distribution interface is arranged on the bottom surface, a dust reduction nozzle is arranged at the rear, and a built-in water channel is arranged inside; the fixed block is used to close the insertion port of the insertion slot. The above-mentioned wet cutting head or cutting drum assembly can increase the anti-bending ability of the cutting tooth, and realize the detachable connection between the tooth seat and the cutting head or cutting drum.

The utility model relates to the technical field of transmission structures, in particular to a gear and gear ring structure. The gear comprises an outer gear ring and a connecting disc, the connecting disc is used for being connected with the driving shaft, an annular flange is arranged on the inner circumferential side of the outer gear ring, and the connecting disc is connected with the annular flange through a first fastener and a second fastener; the first fastener is hollow, a cavity and the peripheral side of the first fastener are provided with an internal thread and an external thread respectively, the first fastener is connected with the second fastener through the external thread, and the second fastener is connected with the internal thread of the first fastener, so that the annular flange and the connecting disc are locked and fixed. The gear is changed from an integral type to a split type, so that when the teeth of the gear are abraded, only the part with the teeth is replaced, the replacement cost is reduced, specifically, the through hole is formed in the middle of the outer gear ring, so that the outer gear ring is used as a consumable part, only the outer gear ring needs to be replaced during replacement, and the maintenance cost is greatly reduced.

The invention relates to an accurate reset stopping mechanism for a gear twisted tooth structure of a plastic mold, which comprises a motor, a gear transmission structure connected with the motor and a tooth core extending structure connected with the gear transmission structure, the gear transmission structure comprises a first gear transmission assembly and a second gear transmission assembly, and the second gear assembly at least comprises a second gear. A second gear limiting structure is arranged on the periphery of the second gear, and the tooth core extending structure comprises a tooth core sleeve and a third gear arranged on the side wall of the tooth core sleeve. By means of the device, the problems that when a servo motor controls the extending and retracting distance of the tooth core, precise control over the extending and retracting distance of the tooth core cannot be achieved due to the influence of gear transmission matching precision, and cost is high are solved. Moreover, the second gear stop block is limited through the second gear limiting structure, the rotation angle of the second gear is controlled, the extending and retracting distance of the tooth core is further controlled, and therefore the tooth core is only parallel to one end of the ejector rod head of the ejector rod assembly when extending out, and the situation that the product is damaged due to protruding is avoided.

The utility model relates to the technical field of fishing gears, and discloses a force unloading sounding alarm device of a fishing reel, which comprises a helical fluted disc, sounding teeth and a trigger ring, a plurality of tooth-shaped structures are arranged on the inner ring of the sounding teeth, the tooth-shaped structures are integrally acute triangles, one surface, close to the center of the sounding teeth, of each tooth-shaped structure is an inclined surface, and the slope of each inclined surface is slow. The triggering ring is sleeved with the oblique fluted disc, a sound production assembly is arranged in the triggering ring, a springback groove is formed in the outer wall of the sound production assembly, a spring is movably sleeved with the springback groove, an ejector pin is slidably inserted into the springback groove, one end of the ejector pin is of an inclined face structure, and the inclined face of one end of the ejector pin is matched with the inclined face of the tooth-shaped structure and makes a sound. The inclined plane at one end of the ejector pin is matched with the inclined plane of the tooth-shaped structure and makes a sound, so that the ejector pin can move along the inclined plane of the tooth-shaped structure when the ejector pin transversely deflects, the ejection pressure of the ejector pin on the tooth-shaped structure is reduced, the abrasion of the tooth-shaped structure is reduced, and the service life of the device is prolonged.

The utility model provides a pressing block type oscillating tooth chain wheel assembly, a plurality of tooth grooves are evenly formed in the middle of a chain wheel shaft in the circumferential direction, and a plurality of first fixing holes are formed in the groove bottoms of the tooth grooves; a plurality of second fixing holes are uniformly formed in the chain wheel shaft at the two ends of the tooth grooves; the top of each tooth row is of a chain nest structure, the tooth rows correspond to the tooth grooves in a one-to-one mode, a plurality of third fixing holes are formed in the tooth rows, the tooth rows are arranged in the corresponding tooth grooves in an inserted mode, the two ends of each tooth row extend out of the corresponding tooth grooves, the pressing blocks are arranged between the adjacent tooth rows respectively, fourth fixing holes are formed in the pressing blocks, and the side walls of the pressing blocks abut against the side walls of the adjacent tooth rows. According to the chain wheel assembly, the tooth grooves and the tooth rows are arranged, the tooth rows are detachably connected, when the chain wheel assembly needs to be maintained, only the damaged tooth rows need to be replaced, the maintenance and repair time of the chain wheel assembly is greatly shortened, meanwhile, the tooth rows can be fixed to the chain wheel shaft more firmly through the pressing blocks, and the service life of the chain wheel assembly is prolonged. And the overall strength of the chain wheel assembly is greatly improved.

The utility model relates to the technical field of computerized flat knitting machines, in particular to a looping integrated insertion piece and an installation structure thereof, which comprise an insertion piece part and a tooth opening part, the insertion piece part and the tooth opening part are of an integrally formed structure, the tooth opening part is arranged at the lower edge of one end of the insertion piece part, and the end part of the tooth opening part is of a trapezoidal structure. The insertion piece part and the tooth opening part are both of a long-strip-shaped structure, the missed stitch phenomenon during looping and knocking-over is effectively controlled, the trapezoidal structure of the end of the tooth opening part extends to the outer side of the needle plate, the tensile force of a roller is dispersed to the tail end base according to the mechanical traction principle, the insertion piece part and the tooth opening part are integrally and evenly stressed and do not swing, and no matter the insertion piece part and the tooth opening part are stressed up, down, left and right during knitting, the knitting effect is good. And the angle and the looping distance are not changed, so that the quality and the effectiveness of the woolen sweater piece manufacturing are effectively improved.

According to the engine arc end-toothed disc tooth surface topology modification method and system provided by the invention, an arc end tooth difference surface is constructed through a convex tooth and concave tooth meshing model of an arc end-toothed disc and a preset tooth surface error, the geometric parameters of the tooth surface are correspondingly obtained, the mismatch amount between discrete points of the tooth surface is calculated according to the geometric parameters, and the tooth surface topology modification method is realized. The tooth surface topology and tooth surface theoretical machining parameters after topology modification are correspondingly obtained; the theoretical machining parameters are adjusted to enable the tooth surface topology to approach the preset tooth surface error, the tooth surface theoretical machining parameters are reversely adjusted to compensate the tooth surface error, actual machining parameters are obtained according to a preset optimization algorithm, and then tooth surface topology modification is achieved. The method and the system can effectively solve the problems of edge contact and stress concentration of the tooth surface of the arc end-toothed disc structure of the aero-engine, and improve the machining efficiency of the tooth surface of the arc end-toothed disc of the engine.

The present invention provides a detachable cutting tool assembly with a dust reduction function, which belongs to the technical field of accessories for cutting devices of coal mining machinery, and includes a conical pick, a conical tooth seat, a dust reduction connection seat and a fixed block; the conical pick includes a shank, a tooth shoulder, a tooth rod and a conical part; the shank and the tooth rod are both cylindrical structures; the tooth shoulder is a truncated cone structure, the bottom surface is connected to the shank, and the top surface is connected to the tooth rod through an annular transition surface; the conical part is located on the tooth rod, and a hard alloy is brazed on the top, and a plurality of oval anti-bending beams are evenly arranged on the circumferential surface; a mounting hole is arranged on the conical tooth seat, and a quick-insert tenon is arranged at the bottom; the dust reduction connection seat is provided with an insertion slot, a water distribution interface is arranged on the bottom surface, a dust reduction nozzle is arranged at the rear, and a built-in water channel is arranged inside; the fixed block is used to close the insertion port of the insertion slot. The above-mentioned detachable cutting tool assembly with a dust reduction function can increase the anti-bending ability of the pick, and at the same time realize the detachable connection between the tooth seat and the cutting head or cutting drum.

The invention relates to a cylindrical surface gas film sealing structure of a tooth-shaped pressurizing groove. The cylindrical surface air film sealing structure of the tooth-shaped pressurization groove comprises a rear end cover and a front end cover which are arranged on a floating ring and a movable ring in a sleeving mode. The tooth-shaped pressurizing grooves are circumferentially arrayed in the peripheral surface of the movable ring at equal intervals, and each tooth-shaped pressurizing groove comprises a tooth-free feature groove area a and a tooth-shaped feature groove area b. Compared with a traditional linear groove design, the tooth-shaped pressurizing grooves are formed in the peripheral surface of the movable ring at equal intervals in the circumferential array mode, tooth-shaped feature groove areas b of the tooth-shaped pressurizing grooves are provided with tooth-shaped structures protruding towards the interiors of the grooves, and the tooth-shaped structures form contraction type channels in the gas flowing direction; when gas flows into the tooth-shaped characteristic groove area b through the tooth-shaped characteristic groove area a, the sectional area of a flowing channel of the tooth-shaped characteristic groove area b is reduced in the gas flowing direction, so that the hydrodynamic effect is enhanced, the buoyancy force of a gas film is improved, the supporting effect on a floating ring is improved, the stability of the gas film is enhanced, the leakage rate is reduced, and the sealing performance is improved.

The utility model provides a trimming lens and an optical lens having the same, the trimming lens comprises a first surface, a second surface and an outer ring surface, the outer ring surface is provided with at least one trimming surface, the trimming surface comprises a first diagonal plane and a second diagonal plane, the surface of the first diagonal plane and the surface of the second diagonal plane are both provided with tooth space structures, and the tooth space structures are arranged in the first diagonal plane and the second diagonal plane. The distance between the tooth crest and the central axis of the trimming lens is the largest, the distance between the tooth valley and the central axis of the trimming lens is the smallest, and the included angle r1 between the first diagonal plane and the central axis of the trimming lens and the included angle r2 between the second diagonal plane and the central axis of the trimming lens meet the formula of 1.3 lt; r1 / r2lt; 2.7, 2.7; the tooth crest distance a, the distance b between the tooth crest and the tooth valley and the included angle theta between the tooth valley of every two adjacent tooth groove structures meet the condition that 0.05 mm < = (a-b) * tan theta < lt >; and the thickness is 0.18 mm. The utility model solves the problem that the small size and stray light improvement of the optical lens in the prior art are difficult to consider at the same time.

The invention provides a split type acetabulum filling cushion block driving-in tool, and belongs to the technical field of medical instruments. Performing main body mold testing; the tooth structure is fixedly connected to one side end of the main body test mold; the notch is formed in the lower end of the main body test mold; the acetabular cup prosthesis test mold is positioned in the notch; the striking head is positioned in the acetabular cup prosthesis test mold; the main body test mold adopts an L-shaped design and is preliminarily fixed through the sliding nail holes, so that fine adjustment can be performed in an operation to reach an optimal position, and accurate placement of the acetabulum filling cushion block is ensured. Due to the design that the tooth peak of the tooth structure is gradually thinned from the root to the head, the tooth structure can be embedded into the acetabular fossa of the host bone more smoothly, the operation difficulty is reduced, and the stability is improved.

The utility model discloses a heat exchange tube, heat exchanger and air conditioner, the heat exchange tube includes: tube body, the inner circumferential wall of tube body is provided with tooth structure along the length direction of tube body spiral extension, the tooth structure is provided with a plurality of at intervals along the circumferential direction of tube body, the ratio of tooth number of tooth structure to tooth height of tooth structure is 909-2100, the outer diameter of the pipe body ranges from 8.8 mm to 9.8 mm. According to the heat exchange tube, the tooth structures spirally extending in the length direction of the tube body are arranged on the inner circumferential wall of the tube body, the tooth structures are arranged at intervals in the circumferential direction of the tube body, and the ratio of the tooth number of the tooth structures to the tooth height of the tooth structures is 909-2100 for the heat exchange tube with the outer diameter of the tube body being 8.8 mm-9. 8 mm. The pressure drop of the heat exchange tube can be reduced, the flow path can be simplified under the condition that the heat exchange performance is not changed, and the complexity of the manufacturing process is reduced.

The present invention provides a method and system for modifying the tooth surface topology of an engine arc-end gear disc. Using a meshing model of the convex and concave teeth of the arc-end gear disc and a preset tooth surface error, the method constructs an arc-end tooth difference surface, obtains corresponding tooth surface geometric parameters, calculates the mismatch between discrete points on the tooth surface based on these geometric parameters, and obtains the tooth surface topology and theoretical processing parameters of the tooth surface after topological modification. The method and system then adjusts these theoretical processing parameters so that the tooth surface topology approaches the preset tooth surface error, reversely adjusts the theoretical processing parameters to compensate for the tooth surface error, and obtains actual processing parameters based on a preset optimization algorithm, thereby achieving tooth surface topological modification. This method and system can effectively address the edge contact and stress concentration issues that exist on the tooth surfaces of aircraft engine arc-end gear disc structures, thereby improving the processing efficiency of engine arc-end gear disc tooth surfaces.

The invention discloses a manufacturing method of a multi-material combined type gear and a combined gear, and the manufacturing method of the multi-material combined type gear comprises the steps that a base body is manufactured, specifically, the base body is manufactured through a first material, and the base body is provided with a mounting part; the tooth part is manufactured through a second material, the hardness of the second material is larger than that of the first material, the tooth part is provided with a matching part, and teeth are arranged on the periphery of the tooth part; and assembling and fixing: after the base body and the tooth part are prepared, the matching part sleeves the mounting part and is in interference fit with the mounting part so as to fix the tooth part and the base body. The gear is divided into the tooth part and the base body and is made of different materials, the problem that a gear of a multi-step structure is difficult to form is solved, meanwhile, the mechanical performance of all the parts of the gear is optimized, the requirement for complex structural design of the gear is met through the combined design, the hardness and abrasion resistance of the tooth part are improved, and the service life of the gear is prolonged. And the stability and the reliability of the whole structure are enhanced.

The utility model relates to the technical field of bone conduction product testing, in particular to a bone conduction product detection device which comprises a base, the base is of a concave structure, and a detachable upper cover is installed on the top face of the base. A bone position structure is arranged on the inner bottom surface of the base, and a bone conduction signal collector is mounted in the bone position structure; a balance weight mechanism is arranged in the base and comprises a balance weight cantilever, a tooth-shaped protruding structure is arranged at the position, over the bone position structure, of the bottom of the balance weight cantilever and used for climbing and pulling an elastic rubber band, and a height adjusting assembly vertically and fixedly installed on the inner bottom face of the base is hinged to one end of the balance weight cantilever. A limiting base is fixedly arranged at the end, away from the height adjusting assembly, of the top face of the balance weight cantilever, and a balance weight is installed in the limiting base. According to the utility model, the transmission path of sound leakage can be structurally blocked through the matching arrangement of the upper cover and the base, and the sound leakage problem during the testing of bone conduction hearing-aid products is fundamentally solved.

The utility model provides an internal rib plate structure of an excavator bucket rod, which belongs to the technical field of engineering mechanical structures and comprises a fixed shell, an inclined rib plate fixedly mounted on one side of the fixed shell, a front rib plate fixedly mounted on the other side of the fixed shell, a connecting component arranged on the surface of the fixed shell and a supporting component arranged in an inner cavity of the fixed shell. Through the collaborative design of the connecting assembly and the multi-layer composite supporting assembly, the overall performance of the bucket rod is improved, the service life of the bucket rod is prolonged, the connecting assembly adopts the welding plate tooth structure, the tooth plate splicing design and the inserting groove and splicing plate combined design, rapid installation and multiple fixing are achieved, and the service life of the bucket rod is prolonged. The assembling efficiency is improved, the reliability of the connecting part is ensured, and the problems that a traditional rib plate is not firm in welding and complex in installation are effectively solved; the supporting assembly forms an optimized stress transfer path and a three-dimensional supporting system through gradient material layout of the connecting layer, the supporting layer, the reinforcing layer, the fixing layer and the filling layer in cooperation with a longitudinal penetrating rib structure.

The invention relates to the technical field of wind power mixed towers, in particular to a duct piece structure capable of improving the deficiency of structural adhesive in a horizontal seam of a wind power mixed tower, the top and the bottom of a duct piece are provided with tooth-shaped structures in the thickness direction of the duct piece, and tooth grooves of the tooth-shaped structures are used for being filled with the structural adhesive; the tooth-shaped structures at the bottoms of the segments on the upper layer are matched with the tooth-shaped structures at the tops of the segments on the lower layer and are fixedly connected through structural adhesives. According to the invention, the filling structural adhesive can be compactly filled in the horizontal seam, and the void phenomenon is reduced.

The present invention provides a dry-type cutting head or cutting drum assembly with a detachable tooth seat, which belongs to the technical field of accessories for cutting devices of coal mining machinery, and includes a conical cutting tooth, a conical tooth seat, a connecting seat, a fixing block, and a cutting head or cutting drum; the conical cutting tooth includes a shank, a tooth shoulder, a tooth rod, and a conical portion; the shank and the tooth rod are both cylindrical structures; the tooth shoulder is a truncated cone structure, the bottom surface is connected to the shank, and the top surface is connected to the tooth rod through an annular transition surface; the conical portion is located on the tooth rod, and a cemented carbide is brazed on the top, and a plurality of oval anti-bending beams are evenly arranged on the circumferential surface; a mounting hole is arranged on the conical tooth seat, and a quick-insert tenon is arranged at the bottom; the connecting seat is welded on the cutting head or cutting drum, and is provided with an insertion groove that cooperates with the quick-insert tenon; the fixing block is used to close the insertion port of the insertion groove. The dry-type cutting head or cutting drum assembly with a detachable tooth seat can increase the anti-bending ability of the cutting tooth, and at the same time realize the detachable connection between the tooth seat and the cutting head or cutting drum.

The utility model relates to the technical field of bridges, in particular to a bridge expansion joint structure capable of damping and reducing noise, which comprises a bridge plate, and a support is welded on the surface of the bridge plate. Through the cooperation of the elastic piece, the damping plate, the damping spring, the damper, the fixing pin shaft, the guide groove and the fixing plate, the damping plate, the elastic sealing strip and the elastic piece which are of the special design structure are utilized, when dust and other sundries fall into the expansion joint, the sundries can be extruded out of the expansion joint through external force, and the expansion joint is prevented from being damaged. The damage of sundries to the function of the expansion joint can be avoided, the service life of the expansion joint is prolonged, through the cooperation of a groove, a compression spring, a positioning block, a positioning groove, a toothed plate and teeth, the expansion joint structure adopts a damping noise reduction technology, such as the positioning block or the teeth of a comb tooth structure in a special shape, so that noise generated when a vehicle passes is reduced, and the service life of the expansion joint is prolonged. Through the design, noise can be effectively absorbed and dispersed, and the driving comfort is improved.

A comb 10 for a heated airflow hair care appliance, comprising an air inlet 12 and air outlets (16, 17, fig.1A), a first tooth structure (48, fig.4A) with a row of teeth 26 and base portion 47 moveabl

A stator assembly (400) of a linear motor, a linear motor, a suspension apparatus (500), and a vehicle. The stator assembly (400) comprises multiple layers of stator cores (200), the multiple layers of stator cores (200) being sequentially stacked along the axial direction of the stator assembly (400); each stator core (200) comprises a stator body (204) and tooth crown structures (30), wherein the tooth crown structures (30) are disposed on the outer peripheral wall of the stator body (204), and the tooth crown structures (30) and the stator body (204) jointly define a recess structure (206) used for mounting a winding coil (300).