63results about How to "Eliminate radial force" patented technology

A system and method are disclosed for collapsing medical devices, such as self-expanding, drug-eluting stents for loading into delivery catheters. The collapsing apparatus may be used for crimping expandable stents and other devices onto a balloon catheter. The medical device is cooled below the austenitic phase transformation temperature of the material forming the device, such as stainless steel or nitinol, and may be cooled until the material has fully transformed to the martenstitic state. For coated medical devices, the device is warmed to a temperature just below the beginning of austenite phase transformation prior to collapsing. An apparatus having a plurality of offset blades, linear bearings, radial bearings and an actuator mechanism is provided for collapsing the medical device. The system is configured with a mandrel subassembly to push the medical device into a catheter sheath, and with a nozzle subassembly to direct cold gas to the medical device.

The invention discloses a multivariant linear arc-shaped motor, comprising a rotary motion linear arc-shaped motor, a rectilinear motion linear arc-shaped motor, a motion shaft and the like. Bridge arc-shaped stators of the rotary motion linear arc-shaped motor and the rectilinear motion linear arc-shaped motor are integrated into a whole by fasteners and step-shaped structures, stator core laminations are distributed in space in an orthogonal manner, stator windings are arranged in an orthogonal and zoning manner, a cylindrical rotor is shared by the two motors, and stator core zone areas and structural parameters thereof can be respectively selected for the two linear arc-shaped motors according to performance indexes. By adopting the scheme in the invention, a load can be directly driven to do linear, rotary or spiral motion, and the multivariant linear arc-shaped motor has the advantages of simple and compact structure, concise transmission mechanism, small bearing wear, easy control and the like.

The invention discloses a lumbar traction bed, which comprises a bed body, a traction device and a lumbar curvature adjustment device. The adjustment device is fixed at the bottom of the bed frame. The lumbar curvature adjustment device includes a lifting mechanism, a translation mechanism, a telescopic mechanism and a grid-shaped adjustment bow. The grid strips can pass through the grid gap of the bed board grid; one end of the adjustment bow is connected with the translation mechanism, and the other end is connected with the telescopic mechanism. The lumbar traction bed can effectively avoid the radial force on the diseased lumbar spine during traction, make up for the shortcomings of existing lumbar traction equipment, and improve the therapeutic effect of traction.

The invention relates to cutter and cutter bar tool equipment for machining a hole, in particular to an adjustable floating reamer integrating universal adjusting, rough machining and finish machining. The adjustable floating reamer comprises a universal adjusting cutter bar, a rough machining reamer and a floating reamer, wherein the universal adjusting cutter bar comprises a cutter bar handle, a universal joint and a cutter bar sleeve, and the cutter bar handle and the cutter bar sleeve are respectively in pin connection with two ends of the universal joint; one cutter bar end of the rough machining reamer is connected to the cutter bar sleeve in an inserting manner, one cutting edge end of the rough machining reamer is provided with a limiting groove; the floating reamer is contained in the limiting groove and can float in the limiting groove, and the rough machining reamer is used for limiting the floating reamer while being used for processing the hole through the cutting edge. According to the adjustable floating reamer disclosed by the invention, various error such as the cutter bar manufacturing error and the deformation error in a machine tool equipment system can be removed, the hole machining accuracy is increased, and thus the quality problems that due to the low equipment accuracy and special hole position, a machine tool main shaft cannot get close to the hole, the cutter bar stretches too long, and the reamed hole machining accuracy is low are completely solved; the rough machining and the finish machining are integrated, and the production efficiency of hole machining is greatly increased.

The invention discloses a prestressed concrete variable-cross-section box girder bridge with an internal tilted-leg rigid frame. The prestressed concrete variable-cross-section box girder bridge with the internal tilted-leg rigid frame comprises a bottom plate and web plates which form a box girder, a tilted-leg rigid frame structure is arranged in a variable-cross-section box girder bridge box and comprises an internal longitudinal beam and an internal tilted leg, the internal longitudinal beam tilts upwards or is bent along the longitudinal direction of the box girder from the midspan to a pier direction, the internal longitudinal beam and the bottom plate are integrated in a segment from the midspan to the 3L/8 section, the rest portions are separated from one another, a midspan positive-bending-moment bottom plate cable is bent along the internal longitudinal beam, jagged blocks are arranged at bottom plate cable tensioning and anchoring positions of the internal longitudinal beam, the bottom plate cable tensioning and anchoring ends are bent in the box from the jagged block positions, and the bottom plate cable is symmetrically tensioned and anchored on the jagged blocks by the two tensioning and anchoring ends. Down-warping deformation of a girder caused by second-phase dead load is eliminated or reduced by the aid of upward radial force of the bottom plate cable, and the box girder is reasonable in structural bearing. The invention further provides a construction method of the prestressed concrete variable-cross-section box girder bridge with the internal tilted-leg rigid frame.

The invention provides a high-speed high-temperature friction and wear test bed adopting symmetrical loading, and belongs to the field of high-speed high-temperature friction and wear tests. The high-speed high-temperature friction and wear test bed comprises a base, a driving module, a test module, a heating module and a measurement monitoring module, wherein power and a high-temperature environment are provided for the test module through the driving module and the heating module respectively; a high-speed electric spindle of the driving module is fixed at one end of a bottom plate through aclamping mechanism, and an output shaft of the high-speed electric spindle is connected with the test module through a flexible coupling; the test module comprises a mechanical shaft, a bearing seatand loading devices; two ends of the mechanical shaft are supported and mounted at the other end of the bottom plate through the bearing and the bearing seat respectively; a test ring is coaxially mounted in the middle of the mechanical shaft through a modular test ring mounting seat and driven by the high-speed electric spindle to rotate synchronously; the two loading devices are symmetrical about the central axis of the mechanical shaft and fixed on the bottom plate; and the highest test rotating speed can reach 30,000 r/min, the highest linear speed of a contact point of the test ring and atest block can reach 400m/s, and the test is stable to complete the measurement function.

Example aspects of the present invention comprise two concentric rings, the rings movable relative to each other and defining a clearance between them for receiving at least one ball. The first ring is a coupling member, the second ring is a tubular slipper with a friction surface on the far side of the clearance, and the ball contacts the coupling member to the tubular slipper. At least one ring has a first recess with side walls for receiving the least one ball, and the friction surface is configured to displace in a radial direction when the at least one ball is axially aligned with the first recess and forced to run up the side walls by rotating the rings relative to one another. In an example embodiment of the invention, the first recess is a calotte.

A local fan for coal mines with a transmission box, which is composed of a current collector, a primary main body, a secondary main body and an outlet joint, and bolts are used to connect each part, and it is characterized in that: the primary main body, The secondary main body is composed of an impeller, a main engine casing, a transmission group, and a motor casing. The transmission group is composed of a transmission box, a coupling, and a motor. The motor shaft and the main shaft of the transmission box are connected by a coupling; the transmission box It consists of a main shaft, an outer small cover, an outer bearing, an end cover, an inner small cover of an outer bearing, an outer small cover of an inner bearing, an inner bearing, a support plate, an inner small cover of an inner bearing, and a box; the beneficial effect is that the lubricating performance is significantly improved, The added coupling eliminates the axial force, radial force and unbalanced force when the impeller rotates, avoiding the occurrence of bearing burnout and bearing cage loosening; compared with ordinary direct-coupled fans, its service life The extension is doubled, which effectively guarantees the need for continuous ventilation underground.

The invention discloses a pressure controllable type limiting anti-loose fine adjusting clamp, and belongs to the field of clamps. The clamp comprises a clamp seat, a left fixing block, a large screw rod, a left clamping block, a right clamping block, a guide rod, a fine adjusting screw rod, a right fixing block, limiting anti-loose devices and dials. A dovetail groove is formed in the clamp seat, the left fixing block and the right fixing block are arranged at the two ends of the dovetail groove, threads are arranged at the two ends of the fine adjusting screw rod, one end of the fine adjusting screw rod is assembled in a threaded hole of the guide rod, the other end of the fine adjusting screw rod is meshed with threads of the right fixing block, the turning directions of the threads at the two ends of the fine adjusting screw rod are the same, the limiting anti-loose devices are arranged on the fine turning screw rod and the large screw rod respectively, and the dials are arranged on the large screw rod and the fine adjusting screw rod respectively. The problems that an existing clamp is hard to adjust finely, low in locating precision and prone to being loosened, and clamping force is hard to control are solved, and the clamp has the advantages of being simple in structure, reasonable in design and easy to manufacture.

This invention discloses a turret positioning device of a numerical control turret. The turret positioning device comprises a mounting block, an air cylinder and a positioning pin, wherein the mounting block is provided with a cavity body with two ends communicated, the positioning pin is arranged in the cavity body, and the air cylinder is mounted at one end of the cavity body of the mounting block; the air cylinder is connected with the positioning pin and can drive the positioning pin to move in the extension direction of the cavity body; a connecting joint is mounted between the air cylinder and the positioning pin, and one end of the connecting joint is fixed to the air cylinder through threads, and a T-shaped notch is formed in the other end of the connecting joint; a T-shaped connecting joint is arranged at the tail end of the positioning pin in a matched mode; a guiding key parallel to the connecting joint is mounted below the connecting joint to eliminate the radial force of a air cylinder shaft; an oil nozzle is mounted on the mounting block, and an annular notch and an oil passing hole are processed in a turning mode in the corresponding positions of the inner wall and the outer wall of a pin sleeve, and lubricating oil can be periodically added between the pin sleeve and the positioning pin, component damaging caused by friction is reduced, meanwhile the fact that the positioning pin is out of action caused by locking due to heat expansion of the positioning pin and the pin sleeve due to overheating friction is prevented.

The invention discloses a winding-free end-part spiral-motion induction motor which comprises a shell. The shell is internally provided with stator winding straight-line part stator iron cores and stator winding end part stator iron cores; the stator winding straight-line part stator iron cores and the stator winding end part stator iron cores are provided with stator windings; a rotating shaft is provided with a rotor of the motor; the surface of the rotor of the motor is provided with a conducting layer of the rotor; and the rotating shaft is movably connected with the shell through a sliding bearing. The winding-free end-part spiral-motion induction motor adopts a set of stator windings, the straight line parts of the stator windings can generate a rotating-motion magnetic field, two end parts of the stator windings can generate a linear-motion magnetic field, and the two magnetic fields jointly act on the rotor of the motor to directly drive a load to do spiral motion. The invention omits the end parts of the traditional motor, two end parts of the stator winding, which can generate linear motion magnetic field, are completely symmetric to stator iron cores on two ends of the motor in space, the radial force can be eliminated, and the wear of the bearing can be reduced. The invention is simple in structure, low in manufacturing cost and small in volume, is easy to implement and is convenient to use.

The invention discloses a limiting and looseness-preventing type overload protective clamp, and belongs to the field of clamps. The limiting and looseness-preventing type overload protective clamp comprises a clamp base, a left fixing block, a left threaded rod, a left clamping block, a right clamping block, a right threaded rod and a right fixing block, wherein a dovetail groove is formed in the clamp base, and the left fixing block and the right fixing block are arranged at the two ends of the dovetail groove respectively. The limiting and looseness-preventing type overload protective clamp further comprises a safety clutch mechanism, a fixed base, an adjusting rod, an outer ring, screws, springs, steel balls, a square handle and limiting and looseness-preventing devices, wherein the limiting and looseness-preventing devices are arranged on the adjusting rod and the left threaded rod respectively, the adjusting rod is assembled in a threaded hole of the fixed base, the square handle is connected with the adjusting rod, the screws are assembled in threaded holes of the outer ring, the steel balls are pressed on the surface of the square handle, and each spring is arranged between the corresponding screw and the corresponding steel ball. The limiting and looseness-preventing type overload protective clamp solves the problems that according to an existing clamp, clamping force cannot be easily controlled, and looseness can be easily caused, and has the advantages of being simple in structure, reasonable in design and easy to manufacture.