7 results about "Shaft length" patented technology

This invention discloses a wide-range speed-regulating permanent magnet synchronous motor with unequal stator and rotor lengths, relating to the field of motor technology. It includes a stator, a rotor, and a dynamic effective stacking height switching mechanism. The stator and rotor are unequal in axial length. The dynamic effective stacking height switching mechanism drives the rotor to move axially and dynamically changes the effective stacking height between the stator and rotor. The effective stacking height is the axial overlap length between the stator and rotor, and the initial value of the effective stacking height between the rotor and the stator is less than the axial length of the stator. By employing a staggered arrangement of the rotor and stator with unequal axial lengths, and by dynamically changing the effective stacking height between the stator and rotor, the motor can switch and increase speed between high-speed low-torque and low-speed high-torque operating conditions without relying on field weakening control, thereby improving the stability and reliability of the motor.

The application discloses a bridge pier column outer wrapping reinforcing structure, a plurality of cylinder bodies are sequentially and fixedly connected in the front and the back, and the plurality of cylinder bodies are wrapped on the peripheral surface of a pier column body; a plurality of fixed flanges are arranged at one end of the cylinder body; a plurality of rotating flanges are arranged at the other end of the cylinder body, the plurality of rotating flanges are fixedly connected with adjacent fixed flanges; one end of an annular blade foot is arranged at the bottom of the cylinder body located at the bottom of the pier column body, and the other end of the annular blade foot extends downward along the axial length direction of the cylinder body; and a stiffening steel hoop is arranged at the peripheral part of the fixed flange. The steel casing body is arranged as a structure in which a plurality of cylinder bodies are sequentially and fixedly connected, so that the steel casing can be synchronously installed with a formwork in a pier column pouring stage, and subsequent secondary positioning and hoisting are avoided; the connection of the fixed flange and the rotating flange simplifies the splicing process of adjacent cylinder bodies, and prevents the pier column surface from being damaged due to mispositioning in the installation process; and the connection of the stiffening steel hoop and the fixed flange improves the structural strength of the fixed flange and the cylinder body, and prevents the splicing part from being deformed or separated due to external force.

A secondary rotation output borrowed shaft comprises a short slender shaft, a long slender shaft, and a middle coarse shaft, forming a first-order fixed shaft that is thick in the middle and thin at both ends. Bearings are fixed at both ends of the moving shaft cavity, positioned at the two perpendicular interfaces of the coarse and thin sections of the fixed shaft. The moving shaft is fixed to the outer surface of the coarse section of the fixed shaft via the bearings. A pulley is fixed to the left end of the moving shaft's outer surface, and a sprocket is fixed to the right end. The sprocket is connected to the output sprocket on the right end of the power output shaft via a chain, forming the primary power output structure. The pulley is connected to the pulley of the stubble shredder's moving shaft via a belt, forming the secondary power output structure. This secondary rotation output borrowed shaft constitutes the power output intermediary structure between the gearbox power output shaft and the stubble shredder's moving shaft, changing the power transmission structure. This secondary rotation output borrowed shaft has a novel design, reasonable structure, and flexible transmission. The power output shaft drives the stubble shredder's moving shaft to rotate via the secondary rotation output borrowed shaft, completing the stubble shredding operation more efficiently.

A system, cone crusher and its main shaft that includes an interference fit section for supporting a crusher head. The interference fit section has a nominal interference fit diameter Dif; a bottom shaft section extending between a bottom end of the main shaft and the interference fit section, and having a bottom part and a neck part. The bottom part has a bottom part length Lbp and a bottom part diameter Dbp that is constant below the neck part on at least 50% of the bottom part length Lbp. The neck part has a neck part diameter growing towards the interference fit section. The main shaft has a main shaft length Lms. Lms1.3 / Dif is at most 40 mm1.3. Dbp1.421 / Dif is at most 9.0 mm0.421.

The application relates to a rotating device for an anti-emulsification experiment cup, which comprises an upper cover, a rotating disc, a mounting bracket, a limiting bearing seat, a driving motor, a rotating shaft and a limiting nut. The upper cover is in a plate-shaped structure, is arranged on a rotating machine box, and the plate surface of the upper cover is provided with a rotating mounting hole. The rotating disc is matched with the rotating mounting hole and is rotatably arranged on the rotating mounting hole. The mounting bracket is arranged on the top of the upper cover and extends to the upper side of the rotating disc. The limiting bearing seat is in a hollow annular structure and is arranged on the mounting bracket. The driving motor is arranged on the limiting bearing seat and is located at the middle position of the rotating mounting hole. The rotating shaft is connected with the output end of the driving motor and is vertically arranged in the length direction. The limiting nut is externally threadedly connected with the rotating shaft and is located in the interior of the limiting bearing seat and abuts against the bearing inner ring of the limiting bearing seat. The cooperation of the limiting bearing seat and the limiting nut effectively limits the axial movement of the rotating shaft, guarantees the stability of the rotating disc and improves the accuracy of the anti-emulsification experiment result.

A CNC gantry machine tool Z-axis long-stroke double-drive head saddle structure includes a slide, a machining spindle and a driving unit, the front side of the slide is recessed with a combination groove, the inner bottom surface of the combination groove is respectively formed with a first assembly surface and a second assembly surface, the first assembly surface and the second assembly surface respectively extend to the opening direction of the combination groove to form a third assembly surface and a fourth assembly surface, each assembly surface is respectively provided with at least one track groove, the two sides of the machining spindle are respectively provided with a linear rail corresponding to each track groove position, each linear rail is arranged in each track groove, thus, in the utility model, each linear rail is arranged on the two sides of the machining spindle, instead of being arranged on the rear side of the spindle as in the prior art, so that the center distance between each linear rail and the machining spindle is close, and the slide is wrapped around the machining spindle on four sides, so that the load capacity and stability of the machining spindle are improved.

A water resistance assembly for a rowing machine includes a water tank, a rotating shaft assembly, a paddle part, at least two blades, and a blade adjustment mechanism. The water tank includes a first shell and a second shell sealed with the first shell. The rotating shaft assembly with a rotating shaft length direction passes through the first shell and the second shell. The paddle part has at least two rod portions each with a rod length direction. The rotating shaft assembly passes through the paddle part. The rod portions are arranged around the rotating shaft assembly. The blade is arranged at an end of the rod portion. The blade adjustment mechanism is connected to the blade. The blade adjustment mechanism is suitable for moving the blade to a relative position on the corresponding rod portion along the corresponding rod length direction.