102results about How to "High transmission precision" patented technology

The utility model discloses a material conveying mechanism for laser welding. The material conveying mechanism comprises an adjusting clamp set, a driving motor and a conveying assembly. The adjusting clamp set comprises a fixed seat, a guide seat, a first clamping flap and a second clamping flap, and the guide seat is in sliding connection with the clamping flaps through guide pins and used for driving the clamping flaps to be opened and closed and adjusting the clamping distance; the driving motor comprises a driving motor body and a lead screw, the lead screw is sleeved with the guide base through a screw hole, and automatic adjustment of the clamping structure is achieved; the conveying assembly comprises peristaltic petals installed at the ends of the clamping petals and eccentric wheels, the eccentric wheels are driven by the output shaft sleeve to rotate, and materials are clamped and conveyed in a peristaltic mode. The mechanism can realize self-adaptive clamping and stable propelling of welding materials with different specifications, has the advantages of compact structure, stable transmission, high universality and the like, and is suitable for material precision conveying requirements in automatic laser welding equipment.

The invention discloses a hinge assembly, a mechanical joint and a robot. A plurality of structural members of the hinge assembly comprise a first structural member, a second structural member and a third structural member. The plurality of bearings of the hinge assembly includes a first bearing and a second bearing. In the axial direction, the bearing seat of the second structural part is located between the bearing seat of the first structural part and the third structural part, the first bearing ring is located between the first bearing and the second bearing, and the two end faces of the first bearing ring abut against the inner ring of the first bearing and the inner ring of the second bearing correspondingly. The second bearing ring is located between the second bearing and the third structural part, and the two end faces of the second bearing ring abut against the inner ring of the second bearing and the third structural part correspondingly. The hinge assembly further comprises a fastening assembly, and the fastening assembly fastens the inner ring of the first bearing, the first bearing ring, the inner ring of the second bearing, the second bearing ring and the third structural part together in the axial direction. Therefore, linkage of the third structural part, the inner ring of the first bearing and the inner ring of the second bearing can be achieved.

The utility model discloses a kind of two-stage planetary reduction module suitable for frameless motor, belong to robot movement field, to solve the problem of poor integration when existing frameless motor adapts reduction module, insufficient reduction capacity.The module includes motor, two-stage planetary reduction mechanism, motor shell, shell end cover and output flange;Motor contains coaxially arranged stator winding and motor rotor, and motor rotor is ladder shaft structure;Two-stage planetary reduction mechanism is composed of primary reduction unit and secondary reduction unit, primary sun gear is connected with motor rotor by first sun shaft, secondary sun gear is connected with primary planetary gear by first planet carrier, and output flange is connected with second planet shaft, and first gear ring is arranged on the inner wall of motor shell.The utility model does not need transition component, and integration is high, two-stage reduction can realize high transmission ratio, and transmission precision is high, support is stable, effectively improve equipment load capacity and operating reliability.

The utility model discloses an edge grinding device for processing a protective air-tight door, which comprises a working table, a first supporting piece is arranged on one side of the upper surface of the working table, the first supporting piece is rotatably connected with two groups of first belt wheels, one end of a shaft rod of one group of first belt wheels is connected with a driving assembly, and the two groups of first belt wheels are in transmission connection with an abrasive belt. The abrasive belt can be tensioned through the tensioning assembly, a limiting roller is arranged on the inner side of the abrasive belt, and the limiting roller can move in the horizontal direction through the moving assembly and can also be matched with the lifting assembly to push the abrasive belt to move downwards to make contact with the air-tight door. The limiting rollers can flexibly move in the horizontal direction and the vertical direction, so that accurate polishing of different positions and shapes of the air-tight door is achieved, the flexibility greatly improves the efficiency and accuracy of polishing operation, and due to the fact that the limiting rollers can freely move in the horizontal direction and the vertical direction, the polishing efficiency is greatly improved. Therefore, the device can meet the polishing requirements of the air-tight doors of different sizes and shapes.

The application relates to a gear expansion sleeve structure for coaxially fastening a gear on a connecting shaft, which comprises an inner pressure expansion sleeve, an outer pressure expansion sleeve and adjusting screws, the inner pressure expansion sleeve is axially symmetrically sleeved on the outer surface of the connecting shaft, the inner surface of the inner pressure expansion sleeve is gradually abutted against the outer surface of the connecting shaft; the outer pressure expansion sleeve is axially symmetrically sleeved on the inner diameter of the gear, and the end portion is abutted against the end surface of the gear, the outer surface of the outer pressure expansion sleeve is gradually abutted against the inner surface of the inner pressure expansion sleeve; the adjusting screws are provided with a plurality of end portions penetrating through the inner pressure expansion sleeve and the outer pressure expansion sleeve, and the inner pressure expansion sleeve is axially moved by being extruded through the axial movement of the adjusting screws, and is abutted against the inner surface of the outer pressure expansion sleeve and the outer surface of the connecting shaft, and the outer surface of the outer pressure expansion sleeve is extruded to the inner surface of the gear. The application realizes the stability between the gear and the connecting shaft, makes the component combination force more reasonable, and ensures the stability of the overall structure.

The utility model relates to the technical field of speed reducer drive structure, and disclose a gear drive structure for speed reducer, including sun gear, gear ring and buffer shock component, the sun gear middle part is equipped with the taper mounting hole, with the taper mounting head of drive link is connected through buffer shock component, and buffer shock component contains the first installation platform of taper mounting hole inner wall, the second installation platform of taper mounting head outer periphery, the disc spring between both and the rubber sleeve of disc spring outer periphery, the inner periphery of gear ring is engaged with planetary gear, and the planetary gear is engaged with sun gear, and the oil cavity is equipped in the planetary gear, and the oil supply groove of outer periphery annular array, the oil supply groove is equipped with oil storage groove in the tooth surface of second wheel tooth two sides, and the oil supply groove is connected with oil storage groove. The utility model can buffer impact, strengthen engagement lubrication, reduce the wear and tear of wheel tooth, promote transmission stability and efficiency, prolong the service life of speed reducer, and be applicable to the speed reducer of industrial, engineering machinery and other fields.

This invention provides a QPQ surface strengthening method for flexible and rigid wheels in harmonic reducers, comprising the following steps: after machining the flexible or rigid wheel, it is sequentially degreased, cleaned, dried, and preheated; the preheated flexible or rigid wheel is nitrided to form a nitrided layer on its surface; the surface of the flexible or rigid wheel is treated mechanically or by tumbling; the polished flexible or rigid wheel is placed in molten oxide salt for oxidation treatment to form an oxide layer on the surface of the nitrided layer; after the oxidized flexible or rigid wheel is air-cooled, it is immediately rinsed with clean water and dried with hot air, and then coated with anti-rust oil. Compared with the prior art, this invention uses low-temperature salt bath nitriding and oxidation treatment, the QPQ process is short, has fewer process steps and is easy to control, and the salt bath can be recycled. The surface hardness of the workpiece reaches 800-850 HV, and the wear rate is reduced by more than 70% compared with the traditional tempering process, significantly extending the service life of the workpiece.

The utility model discloses a feeding reciprocating synchronizing device of a flaking machine, and belongs to the technical field of disc type flaking machines. The device mainly comprises a base assembly, the base assembly is movably connected with a long material conveyor and a material pressing device which can move in a reciprocating mode, the material pressing device is fixedly arranged at one end of the long material conveyor, and the conveying direction of the long material conveyor is perpendicular to the moving direction of the long material conveyor and the moving direction of the material pressing device. The base assembly is rotationally connected with a reciprocating transmission mechanism used for driving the material pressing device and the long material conveyor to move synchronously. The reciprocating transmission mechanism comprises at least one transmission shaft, gear mechanisms are fixedly connected to the transmission shafts located at the two ends of the reciprocating transmission mechanism respectively, and rack mechanisms meshed with the gear mechanisms are fixedly connected to the material pressing device and the long material conveyor respectively. Synchronous reciprocating feeding of the long wood conveyor and the material pressing device is achieved, the stability of long wood in the planing process is guaranteed, and the machining precision is improved.

The utility model provides a rotary jig which comprises a shell, an input shaft and a plurality of output shafts. The input shaft extends into the shell from the bottom; the multiple output shafts are arranged in a left-right distribution mode and are vertically and rotationally connected into the shell through two first bearings correspondingly. The device is characterized by further comprising a plurality of transmission assemblies and adjusting assemblies. A driving gear is mounted in the middle of the input shaft; a driven gear is mounted in the middle of the output shaft; the transmission assemblies are installed in the shell and distributed between the input shaft and the output shaft at intervals. The two transmission assemblies located on the two sides of the output shaft are distributed on the two sides of the output shaft in a diagonal mode. The transmission assembly comprises a rotating shaft, a transmission gear and two second bearings; the upper end and the lower end of the rotating shaft are rotationally connected into the shell through second bearings. The transmission gear is mounted in the middle of the rotating shaft; the number of the adjusting assemblies is the same as that of the transmission assemblies. The adjusting assemblies are installed on the front side and the rear side of the shell and exert pressure in the inner side direction of the shell to abut against the transmission assembly.

The utility model provides a bevel gear structure and belongs to the technical field of machinery. The problem that an existing bevel gear is poor in transmission precision is solved. The bevel gear structure comprises a bevel gear and a gear shaft which are coaxially arranged, a connecting column is integrally formed on the bottom wall of the bevel gear, a conical hole with the hole diameter gradually increasing from top to bottom is formed in the bottom wall of the connecting column, and the connecting column, the conical hole and the bevel gear are coaxially arranged; a circular-truncated-cone-shaped connecting part matched with the conical hole is integrally formed at the top of the gear shaft, and the connecting part is inserted into the conical hole; an annular groove coaxial with the bevel gear is formed among the connecting part, the bottom wall of the connecting column and the top wall of the gear shaft, and the annular groove is filled with welding fluid so that the connecting column and the gear shaft can form a whole. The bevel gear structure is high in transmission precision.

The utility model discloses a six-degree-of-freedom parallel robot driven by a lead screw nut pair, and relates to the technical field of mechanisms and robots. The six-degree-of-freedom parallel robot is characterized by comprising a machine frame, a movable platform and six movement branch chains connected between the machine frame and the movable platform in parallel; each motion branch chain comprises a motor, a guide rail, a lead screw, a nut, a sliding block, a connecting rod and a connecting plate; the motor is fixedly installed on the connecting plate, an output shaft of the motor is connected with the lead screw, the pair of guide rails are arranged on the two sides of the lead screw in parallel respectively, the nut is in threaded connection with the lead screw and is in sliding fit with the two guide rails, and the top end of the connecting rod is fixedly connected to the nut. The motor drives the lead screw and drives the connecting rod to move through the nut so as to change the posture of the movable platform. The movable platform of the parallel robot should have a large rotation range, can adapt to different machining paths and posture requirements, and is more compact in structure and good in structural rigidity.

The utility model provides a split type gear shaft of improved structure belongs to mechanical technical field, it has solved the problem of inconvenient maintenance of existing gear shaft. The split type gear shaft of improved structure includes the shaft body and two ring gears of respectively sleeveing in the both ends of shaft body, two ring gears all are connected with the shaft body through the flat key or the spline, the middle part of shaft body is equipped with and has the locating sleeve, the both ends of locating sleeve respectively extend into two ring gears, the both ends of locating sleeve outside surface all have a section taper surface one, two taper surfaces one along the center symmetry of locating sleeve are arranged, and the diameter of taper surface is gradually increased from the corresponding locating sleeve end to the middle part direction of locating sleeve, two ring gears inner wall all have taper surface two, two taper surfaces two are respectively pasted on two taper surfaces one, the both ends of shaft body still are equipped with and can detachably fixed annular limiting piece, two limiting pieces are respectively pressed on the end face of two ring gears opposite to each other. The split type gear shaft of improved structure is convenient to maintain.

The utility model relates to the technical field of microscope, especially a kind of objective lens switching device, including chassis, objective lens mounting disc, bar motor drive group and objective lens adjusting assembly;Objective lens mounting disc is slidably arranged in chassis along first horizontal direction, bar motor drive group is arranged in the side of chassis along first horizontal direction, bar motor drive group is transmissionally connected with objective lens mounting disc, to take objective lens mounting disc and move along first horizontal direction, objective lens adjusting assembly is arranged in the other side of chassis;Objective lens mounting disc is provided with several objective lens mounting holes, objective lens mounting seat is movably arranged in objective lens mounting hole, objective lens adjusting assembly has adjusting piece moving along second horizontal direction, adjusting piece can be butted with objective lens mounting seat, to take objective lens mounting seat and move along second horizontal direction;The movement of objective lens mounting disc is driven by bar motor, reduces installation debugging difficulty, improves transmission accuracy, and objective lens position is adjusted by objective lens adjusting assembly, improves the consistency of objective lens.

The utility model belongs to mechanical drive technical field provides a kind of double input transmission device, including input shaft, first gear is set on the input shaft and input shaft two ends are connected power source respectively;Synchronizer is set on the input shaft, the synchronizer side is provided with the yoke of pushing the synchronizer and first gear power connection;Output shaft is connected with the first gear transmission. By the above technical solution, the input shaft of the utility model is connected with two power sources simultaneously, the structure is compact, double power source is efficiently compatible, improves system redundancy;The yoke can quickly interrupt power, enhances the flexibility of transmission device.

This utility model relates to the field of busbar profile feeding technology, and provides a gantry-type profile feeding and storage system, including a gantry frame, a crossbeam slidably mounted on the gantry frame, the crossbeam and the gantry frame connected by a translation component, a lifting component mounted on the crossbeam, the lifting component connected to a gripping component, a feeding rack mounted on the ground below the gantry frame, the length direction of the feeding rack and the length direction of the gripping component being parallel to the length direction of the crossbeam, limiting rails and a material storage bin are respectively mounted on both sides of the length direction of the feeding rack, a feeding trolley is mounted within the limiting rails and can move out of the limiting rails, at least two feeding trolleys are provided, and several retaining posts are movably mounted on the material storage bin, the distance between the retaining posts being adjustable, for placing profiles of different widths. This utility model can automatically feed and store busbar profiles, improving production efficiency, effectively utilizing the difference in production cycle time between upstream and downstream processes for profile storage, and has good practicality.

A brake handle with a dynamically variable rotation center in the braking process comprises a brake shell, a piston assembly, a push rod assembly, a brake handle, a multi-fulcrum linkage component and a rotation switching mechanism. The shell is provided with a piston cavity. The handle drives the piston to move through the push rod. The linkage component is provided with two rotating fulcrums, and the switching mechanism can switch two working states. When the front section of the handle is pinched, the handle rotates around the first fulcrum, idle stroke is eliminated, and operation is labor-saving. When the rear section is pinched, the second fulcrum is switched to rotate, and the lever ratio is increased to improve braking force. By means of automatic switching of double fulcrums, labor-saving control and large braking force output are both considered, and the problem that a traditional hydraulic brake handle is poor in performance is solved; the modular structure is easy to adapt to mass production, and switching nodes are accurate and controllable; a locking and failure protection structure is arranged, so that the operation is stable and safe; meanwhile, eccentric wear of parts is eliminated, the service life of sealing pieces is prolonged, and braking efficiency and use safety are improved.

The utility model discloses a flexible positioning rotation hair picking device for bird's nest, which comprises a rotating workbench, a bottom center of the rotating workbench is connected with an external air source through a rotating joint, a top center of the rotating workbench is provided with a conical table for bearing the bird's nest, a flexible positioning assembly, a hair picking needle, and a gantry. The utility model adopts the structure of the pressure-equalizing air bag array cooperating with the radial push rod, so that all the push rods work under constant pressure, can adaptively adhere to the irregular surface of the bird's nest with different strokes, and provide uniform radial clamping force. The utility model solves the technical problem that the traditional rigid clamp is easy to bruise and crush the bird's nest, greatly reduces the raw material loss rate, and ensures the integrity and economic value of the bird's nest.

The utility model discloses a wireless self-stop type line finding structure, which belongs to the technical field of line finding of an inlaying machine and is characterized by comprising a conveying mechanism, a line finding mechanism is fixedly connected to the inner side of the conveying mechanism, and a PLC (programmable logic controller) is mounted on the surface of the right side of the conveying mechanism. A servo motor in the conveying mechanism drives a conveying belt through a connecting rotating shaft connected through a flat key, high transmission precision is ensured, slipping is avoided, stable conveying of wires is achieved, and the machining precision of the head embedding machine is improved. Two sets of correlation type photoelectric sensors of the wire finding mechanism are located on the front side and the rear side of a supporting shell correspondingly, and double-position detection points are formed; the position and the conveying state of the wire can be accurately judged, missing detection or misjudgment possibly caused by single-line detection is avoided, the central axis of the transmitting end and the central axis of the receiving end of the photoelectric sensor are collinear, it is ensured that the light propagation path is shortest and stable, and the detection sensitivity is improved; and the servo motor is triggered to stop automatically through a wireless signal.

The application discloses a harmonic reducer and belongs to the technical field of reducers. The harmonic reducer comprises a flexible gear, a bearing outer ring, a rigid gear and a wave generator. The flexible gear comprises a flexible deformation part which is engaged with the inner side of the rigid gear, a driving part which is located on the outer side of the rigid gear and a connecting part which connects the flexible deformation part and the driving part. The bearing outer ring is located on the outer side of the rigid gear and is fixedly connected with the driving part. The driving part and the bearing outer ring are rotationally matched with the outer side of the rigid gear. The wave generator extends into the flexible deformation part. The harmonic reducer is simple in structure, reduces the number of parts and manufacturing cost, reduces the overall size and weight of the reducer, guarantees high transmission precision and is suitable for robots used in household, public service, scientific research and education and other scenes which pursue low cost and high practicability.

The invention discloses a vehicle-mounted shelter telescopic hoisting device which comprises a fixed arm, a movable arm, a sliding trolley, an electric capstan, a movable arm movement driving mechanism, a movable arm movement guiding mechanism, a sliding trolley synchronous movement mechanism and a sliding trolley movement guiding mechanism. The movable arm driving mechanism is located in the inner shrinkage notch and the upper-layer cavity of the movable arm, the upper portion of the sliding trolley is located in the lower-layer cavity of the movable arm, and the lower portion of the sliding trolley is hinged to the upper end of the electric capstan; the movable arm moving guide mechanism is arranged between the movable arm and the fixed arm, the two ends of the sliding trolley are connected with the movable arm and the fixed arm through the sliding trolley synchronous moving mechanism, and the two sides of the sliding trolley are supported on a lower-layer bottom plate of the movable arm through the sliding trolley moving guide mechanism respectively. The device is compact in structure, convenient to use, large in bearing capacity, high in transmission precision, small in occupied space, good in stability, high in reliability and wide in application range.

This application relates to the technical field of motor rust prevention, and in particular to a coal mining machine motor with an anti-rust stop. It includes a load cavity and a motor body, the motor body being disposed inside the load cavity. A motor flange is provided at one end of the motor body. The load cavity has a load stop that mates with the motor flange. The motor flange has a body stop that mates with the load stop. A sealing groove is formed on the surface of the body stop, and a sealing device is provided within the sealing groove. The sealing device is used to seal the gap between the body stop and the load cavity. Compared to existing technologies, this application has stronger sealing protection capabilities, effectively preventing moisture from entering between the motor body and the load cavity, thereby solving the problems of rust prevention and easy disassembly of motors in extremely harsh environments.

The utility model discloses a kind of milling devices of automobile mould knife edge profile, it is related to milling device technical field.The utility model includes milling machine, the milling machine top is provided with working plate, the milling machine top is fixedly connected with drive box;The drive box bottom is provided with replacement assembly, and replacement assembly includes the drive head of fixed connection in the drive box bottom.By the drive head of replacement assembly, mounting sleeve and disassembly plate collaborative work, tool can be quickly disassembled and installed, the efficiency of tool replacement is significantly improved, limiting component is positioned through the cooperation of limiting sleeve, first spring and inclined block, ensure that tool can be accurately positioned and firmly fixed during installation process, avoid the problem of machining accuracy decline caused by tool loosening or deviation, not only simplify operation process, also greatly reduce downtime, improve production efficiency, while ensuring the stability and consistency of machining quality.

The utility model relates to iron lithium battery recycling and dismantling technical field, and disclose a kind of clamping structure for iron lithium battery disassembly, it include: base, the top of base is fixedly connected with support foot, the top of support foot is fixedly connected with support frame;Working mechanism, working mechanism includes rotating assembly, moving assembly and clamping assembly, moving assembly is located in the inner chamber of support frame and is used for the movement of working assembly, rotating assembly is located in the inner chamber of moving assembly and is used for the movement of clamping assembly, clamping assembly is located in the top of moving assembly and is used for clamping battery.The utility model realizes the opening and closing action of clamping plate by the meshing transmission of gear and rack, transmission precision is high and force is uniform, can ensure to form stable clamping to iron lithium battery;Meanwhile, the sliding block of moving block both sides and the sliding slot of moving workbench inner chamber constitute limiting component, further limit the linear motion track of moving block, avoid the deviation or slack in clamping process.

The invention relates to the field of servo structures, and discloses a double-shaft positioning rotary table which comprises an azimuth harmonic reducer, an azimuth main graduated scale, an azimuth vernier scale, a pitching harmonic reducer, a pitching main graduated scale and a pitching vernier scale. The azimuth assembly adopts an azimuth harmonic reducer as an azimuth rotating shaft system, correspondingly, the pitching assembly adopts a pitching harmonic reducer as a pitching rotating shaft system, the transmission precision of the harmonic reducer is high, the backlash angle of the double-shaft positioning rotary table can be effectively reduced, and the harmonic reducer is compact in structure, small in size and light in weight. On the premise of ensuring normal measurement, the structure of the double-shaft positioning rotary table can be simplified, the quality of the double-shaft positioning rotary table is reduced, and the adaptability of the double-shaft positioning rotary table is improved. According to the invention, the azimuth assembly realizes azimuth angle reading by using the azimuth vernier scale and the azimuth main graduated scale, and the pitching assembly realizes pitching angle reading by using the pitching vernier scale and the pitching main graduated scale, so that the reading accuracy is improved.

The invention discloses a large-span wing drilling device, which belongs to the technical field of robot drilling, and comprises double AGV (automatic guided vehicle) moving frames which are symmetrically arranged, a tail end posture adjusting device, a differential feeding device, an automatic feeding drill gun, a winding arrangement and an aircraft wing fixing truss, a double-AGV moving frame drives the whole mechanism to move and position, a plurality of cables which are arranged in a winding mode transmit power, a tail end posture adjusting device achieves multi-dimensional posture adjustment of a drill gun through traction of the cables, the drill gun is parallel to a normal vector of a hole site of a drill plate, a differential feeding device of a conical winding drum drives the drill gun to conduct accurate feeding, and the drill gun is driven to conduct drilling. The variable-diameter locking mechanism of the drill gun can prevent drilling vibration from influencing the precision. According to the device, large-range drilling of the large-span wing is achieved, the drilling precision and efficiency are high, the flexibility degree is good, the device is suitable for multi-model production, and the labor intensity of workers is greatly reduced.

The utility model discloses a multi-directional climbing device for a transmission tower, which comprises a multi-directional climbing module and a base. The multi-directional climbing module includes a clamping mechanism, a climbing mechanism and a steering mechanism. Among them, the clamping mechanism and the climbing mechanism are connected through the steering mechanism. The clamping mechanism is used to clamp or loosen the tower during climbing; the climbing mechanism adopts a screw drive mechanism, and transmits the power of the rotating motor to the ball screw through a synchronous pulley assembly, so as to drive the ball screw platform to complete longitudinal movement; the steering mechanism is used to cooperate with the movement of the clamping mechanism during climbing, so that the device can smoothly turn when reaching the cross arm of the tower. The device of the utility model can climb and cross obstacles, is applicable to transmission towers of different structural types including main material angle steel and cross arms, has a strong load capacity, and can carry maintenance equipment to complete maintenance tasks.

The application discloses a high-lifting oil cylinder base boring machining equipment, which comprises a positioning structure unit and a boring machining unit. The positioning structure unit comprises a positioning base, a positioning driving assembly, a moving seat, a positioning plate, a longitudinal fixing assembly and a transverse fixing assembly. The moving seat is installed on the positioning base through the positioning driving assembly. The positioning plate is installed on the moving seat. A plurality of parallel long-slot clamping grooves are formed in the positioning plate. The longitudinal fixing assembly is installed at one end of the positioning plate. The transverse fixing assembly is detachably installed at the other end of the positioning plate. Through the cooperation of the positioning structure unit and the boring machining unit, the high-lifting oil cylinder base can be accurately positioned, fixed in multiple dimensions and adaptively bored.

The invention discloses a traction machine with a duplex gear planetary assembly, and relates to the technical field of traction machines, the traction machine comprises a rack, a motor, a planetary speed reducing mechanism and a traction wheel, a support frame is arranged on one side of the rack, the traction wheel and the motor are respectively arranged on two sides of the rack, the planetary speed reducing mechanism is detachably arranged at the center of the traction wheel, and the motor is arranged on the support frame. One end of the planetary reducing mechanism is rotationally arranged on the support frame, and the other end is connected with the motor and is driven by the motor; according to the scheme, the first-stage planet wheel and the second-stage planet wheel are integrally machined and formed, and a connecting gap of a traditional split type planet wheel is avoided, so that the transmission precision is improved, and vibration noise is reduced; by means of the tooth number difference of the first-stage planet wheel and the second-stage planet wheel, large-speed-ratio transmission can be achieved through single-time meshing; by means of the double-meshing structure that the first-stage planet gear is meshed with the sun gear and the second-stage planet gear is meshed with the gear ring, single-tooth stress is dispersed, the bearing capacity of the gear is improved, and the service life is prolonged.

The utility model discloses a bicycle hub drum aluminum tower base relates to the aluminum tower base field, to solve the recess for placing the pawl in the tower base integral type setting of prior art, when the recess appears damage when the tower base long -time use, cannot independently replace, need to replace the tower base integrally, the problem of poor economy. Aluminum tower base front end is connected with the fixed ring, the fixed ring front end is connected with the fixed pipe, is provided with the connecting ring on the fixed pipe, three pawl recesses are arranged on the connecting ring outer wall annular array, three pawl recesses are provided with the pawl, the connecting ring outside is connected with the blocking ring, when the pawl or pawl recess appears abrasion, only need to disassemble the second countersunk screw of connecting ring rear end can replace the whole connecting ring, or disassemble the first countersunk screw of blocking ring and replace the pawl alone, avoided the problem that traditional integral type tower base needs to replace integrally when partial damage.

The invention relates to the technical field of transportation equipment, in particular to a closed rail power and free chain system which comprises a profile rail, a plurality of trolleys, a plurality of power and free devices and a chain, the trolleys are arranged along the extension path of the profile rail and slidably arranged on the profile rail, the power and free devices are correspondingly arranged on the trolleys, and the chain is arranged on the profile rail. The chain is arranged in the section bar track. The short bushings are arranged, and the short bushings are configured to rotate by the preset angle in the circumferential direction relative to the chain link units every time the chain link units corresponding to the short bushings move to the preset positions of the profile rails, so that the circumferential stress positions of the short bushings are changed compared with the previous stress positions, and the situation that the local circumferential positions of the short bushings are stressed for a long time, so that the service life of the short bushings is prolonged is avoided. And therefore, the problem of circumferential eccentric wear of the short bushing is prevented, and the transmission precision and the transmission stability of the chain are ensured.