220 results about "Torsional strength" patented technology

The invention provides an optical fiber force-shape sensing device and method through a natural orifice, and relates to the technical field of optical fiber sensing, the device comprises an operation arm mechanism, and specifically comprises a front end connecting joint, a plurality of movable joints and a tail end connecting joint which are sequentially and rotatably connected through a ball head and a ball socket, at least one limiting bulge is distributed on the circumferential surface of the ball head, and the limiting bulge is connected with the front end connecting joint; limiting grooves in one-to-one correspondence with the limiting protrusions are formed in the ball socket, and the limiting protrusions are in sliding fit with the limiting grooves so as to limit in-situ torsion between the adjacent joints. Through mutual cooperation of the limiting grooves and the limiting protrusions, in-situ torsion is reduced, torsional strength is improved, a shape-following embedded optical fiber sensor integration method is provided, shape reconstruction errors caused by movement dislocation are reduced, and protection of optical fibers is achieved. A first driving wire, four second driving wires, two optical fiber shape sensing modules and four optical fiber force sensing modules are embedded in the operation arm mechanism, and real-time accurate measurement of interaction force and the bending shape of the operation arm mechanism can be achieved.

The invention discloses a cable mechanical property testing device and method, and relates to the technical field of cable detection.The cable mechanical property testing device comprises a clamping mechanism, a tension applying mechanism, a torsion applying mechanism and a bending mechanism, the pulling force applying mechanism comprises two force applying moving frames and a pulling force driving assembly; the torsion applying mechanism comprises two torsion driving assemblies installed on the two swing seats correspondingly, and the two torsion driving assemblies are used for driving the two clamps to rotate correspondingly. The bending mechanism comprises a bending abutting assembly located between the two clamps and a bending driving assembly in transmission connection with the bending abutting assembly. The tensile property test, the distortion resistance test and the bending resistance test can be continuously completed through one-time clamping of the cable, different actual installation and use scenes of the cable can be simulated, and the accuracy of tensile property, distortion resistance and bending resistance test results of the cable is improved.

The utility model relates to the technical field of forklift fork frame strength detection, in particular to a forklift fork frame strength detection device which comprises a bottom plate and a fork frame, and the top of the bottom plate is fixedly provided with a door-shaped frame and a mounting seat; two testing mechanisms used for carrying out downward pressing, lateral pushing and torsional strength detection on the fork frame are symmetrically arranged in the door-shaped frame, and control mechanisms used for controlling the door-shaped frame to move longitudinally are arranged at the positions, corresponding to the two testing mechanisms, of the top of the door-shaped frame; by arranging the testing mechanism, the effects of simulating a vertical pressure test during cargo bearing, simulating a lateral force test during cargo roll or vehicle body turning and simulating a torsional load test caused by uneven ground or cargo gravity center shift during cargo insertion can be achieved; the performance of the fork frame under various actual working conditions can be comprehensively evaluated, and it is ensured that the fork frame can work safely and reliably in a complex working environment.

The invention provides an air spring upper supporting structure, an air spring and a vehicle, and belongs to the technical field of suspension systems. The scheme that the top rubber, the blocking cover and the check ring are arranged on the upper supporting body is achieved through the arrangement of the installation groove, the reliability of matching with the piston rod can be guaranteed, and the compactness of the upper supporting structure of the air spring can be improved. The threaded sleeve is arranged in the mounting hole, so that structural damage to the area where the mounting hole is located can be effectively avoided, and the service life of the upper supporting structure of the air spring is prolonged. By arranging the heat insulation pad, the problem that the whole air spring is seriously heated due to the fact that the upper supporting body absorbs excessive heat is solved, and the service life of a rubber part in the air spring is shortened. The arc-shaped flow guide faces are arranged at the corners of the first air channel and the second air channel, so that vortexes are avoided, friction is reduced, and the problem of abnormal sound generated by air flowing is solved. Double connection of the threads and the positioning pins is adopted between the mounting hole and the threaded sleeve, so that the anti-loosening strength and the torsional strength of the threaded sleeve are enhanced, and the threaded sleeve is prevented from loosening.

The utility model discloses a main shaft of a photovoltaic tracking support and the photovoltaic tracking support. The cross section of the main shaft is a compact cross section. The cross section of the main shaft comprises four plane sections and four arc sections, and the four plane sections and the four arc sections are sequentially and alternately arranged in the circumferential direction to form a square tubular structure; the widths of the four plane sections are equal, and the radians of the four arc sections are also equal, so that a square tubular structure formed by the four plane sections and the four arc sections is a centrosymmetric graph relative to the axis of the main shaft. The ratio of the width x'of the plane section to the wall thickness t of the main shaft, namely the width-to-thickness ratio x ' / t is between 20 and 25, and the torsion strength and the bending strength can be balanced and considered, so that better stability is achieved.

The invention relates to the technical field of cable strength testing, in particular to a line vibration fatigue damage detection device which is characterized in that a supporting frame is arranged on the upper end face of a workbench, positioning cylinders are rotationally connected to the two sides of the supporting frame, clamping rods are arranged on the side walls of the positioning cylinders, threads are formed in the outer sides of the clamping rods, and the positioning cylinders are rotationally connected with the supporting frame. The clamping rod is in threaded connection with the positioning cylinder, a clamping protrusion is arranged at the top of the clamping rod, a positioning plate is arranged above the workbench, a tensile machine is arranged on the upper end face of the positioning plate, a drag hook is arranged at the output end of the tensile machine, and a conveying mechanism for driving the positioning plate to move is arranged on the workbench. And a driving part for driving the positioning cylinder to rotate is arranged on the supporting frame. Compared with the prior art, the tensile strength and the torsional strength of the cable can be detected respectively, the torsional strength can be detected while the tensile strength of the cable is detected, equipment does not need to be replaced, and the detection efficiency is improved.

A body-worn device for flexibly supporting a body part such as the head in a hunched over position such as when a surgeon performs surgery. The device can include a head harness connected to a torso harness by a specialized oblong variable stiffness beam that extends upwardly along the back of the spine of the wearer. The beam can include a variable stiffness member having a complex tapered geometry. The member can be made from a unitary piece of fiber composite material wherein the orientations of the fibers are varied to provide both bending and torsional strength and stiffness that varies along the length of the member. The beam and harnesses can include a plurality of interconnected mechanisms to provide greater adjustability.

The utility model relates to the technical field of bolt workpiece detection tools, in particular to a bolt torsional strength detection device, which is characterized in that two racks are symmetrically arranged front and back, the racks are fixedly arranged on the right side wall of a base on the left side, two supporting shafts are symmetrically arranged front and back, and the two supporting shafts are respectively screwed on the racks on the front side and the rear side through bearings; the number of the clamping claws is two, the two clamping claws are fixedly arranged on the supporting shafts on the front side and the rear side respectively, the supporting arms are fixedly arranged on the supporting shafts, and the front supporting arm and the rear supporting arm are symmetrically arranged up and down. By designing clamping and fixing structures with symmetrical front and back brightness and arranging a u Andong driving structure, the rotation directions of front and back transmission structures are opposite, and the transmission structures are provided with variable-speed transmission structures, so that the stress application rates of the front and back clamping structures are adjusted, different curve models for measuring the torque change of a workpiece are realized, and the measurement precision of the workpiece is improved. And the comprehensive coverage of the torsional strength measurement data of the bolt workpiece is realized.

The invention relates to the technical field of geological exploration, and discloses a stratified sampling drilling device and a connecting piece and a drilling cylinder thereof, which are arranged at the top end of the device and used for providing rotation driving force. The multi-section drill pipe comprises a low pipe, a middle pipe and a deep pipe which are connected in sequence. According to the stratified sampling drilling device and the connecting piece thereof, the connecting piece adopts a circumferential positioning and radial limiting structure of an annular groove II and an annular positioning plate, and is matched with the axial locking design of a threaded rod and a nut, so that the coaxiality and the connection strength of adjacent drilling pipes are kept in the drilling process, and the impact of stratum stress is effectively resisted; the annular positioning plate is embedded into the second annular groove to achieve + / -0.05 mm-level coaxiality calibration, the pre-tightening force of the threaded rod can reach 50 kN, compared with traditional threaded connection, the torsional strength is improved by three times, the disassembly time is shortened to 5 minutes from 30 minutes, the detachable connection mode supports rapid assembly and disassembly, the number of drill pipe sections can be flexibly increased or decreased according to the drilling depth, and the drilling efficiency is improved. Meanwhile, the equipment maintenance and sample cylinder replacement processes after sampling are simplified, and the working efficiency is improved.

The utility model discloses a slide rail with a support frame, which comprises a first rail, a first support frame arranged on one side of the first rail and a second support frame, the first support frame comprises a first side wall, two ends of the first side wall are respectively bent and extended to form a transverse wall, the tail ends of the two transverse walls are respectively bent and extended towards the opposite inner sides to form longitudinal sections, and the longitudinal sections are respectively bent and extended towards the opposite inner sides of the first side wall and the second side wall. The second supporting frame comprises a second side wall, the two ends of the second side wall are bent and extend towards the two longitudinal sections to form first parts respectively, the tail ends of the two first parts are bent reversely to form bent parts abutting against the two longitudinal sections respectively, and the tail ends of the two bent parts extend towards the first side wall to form second parts supported on the two transverse walls respectively. The two second parts abut against the sides, adjacent to the two transverse walls, of the two first parts, and therefore the torsional strength for avoiding deformation when the second supporting frame is pulled by the first rail is improved.

The utility model relates to the technical field of battery cover plates, and discloses a connecting structure of a rubber coating ring and a top cover plate, which comprises the top cover plate, a pole hole for a pole to pass through is arranged in the top cover plate, and the pole is provided with a middle section arranged in the pole hole in a penetrating manner; the periphery of the middle section is wrapped with a rubber coating ring, and a notch groove is formed in the periphery of the rubber coating ring. An upper plastic part is embedded in the pole hole, the periphery of the rubber coating ring is wrapped by the upper plastic part, the notch groove is embedded, and the pole, the top cover plate, the rubber coating ring and the upper plastic part are fixedly combined into a whole; the notch groove is formed in the periphery of the rubber coating ring, the upper plastic part can be embedded in the notch groove in the process of forming the upper plastic part through injection molding, and the upper plastic part and the top cover piece are combined into a whole, so that the torsion value is increased, the upper plastic part cannot fall off after being subjected to a fatigue test, the service life of the upper plastic part is prolonged, and the anti-rotation capability of the pole is improved.

This invention discloses a composite testing device for the interface connection strength of a gas meter housing, relating to the field of gas meter manufacturing and testing technology. In existing technologies, after the gas meter housing is manufactured, it needs to be transferred to specific equipment for interface pull-out and torsion testing, both typically performed on separate equipment, resulting in low efficiency. The composite testing device provided by this invention is integrally mounted on the fixed pressure plate of a stamping and riveting equipment, comprising: a clamping structure including a clamping cylinder and a clamping linkage assembly, the clamping linkage assembly including a wedge-shaped push block and two clamping parts, the clamping parts having arc-shaped clamping portions for clamping and fixing the interface; a pull-out testing structure applying a straight load at the interface for pull-out strength testing; and a torsion testing structure applying a torsional load to the clamping structure for torsional strength testing. This invention enables direct strength testing after stamping and riveting, eliminating the step of disassembly and reinstallation, improving production testing efficiency, and reducing production costs.

The utility model discloses an antenna support and an unmanned off-highway dumper. The antenna support comprises a mounting plate, two pairs of mounting seats, a pair of front inclined supporting rods, a pair of rear inclined supporting rods and a pair of rear supporting rods. The pair of front inclined supporting rods, the pair of rear inclined supporting rods and the pair of rear supporting rods are in one-to-one correspondence and are splayed, the front inclined supporting rods and the rear inclined supporting rods incline forwards, the large opening ends of the pair of front inclined supporting rods are connected with the two ends, close to the length direction, of the bottom of the mounting plate respectively, and the small opening ends of the pair of front inclined supporting rods are connected with the pair of mounting bases close to the mounting plate respectively; the small opening ends of the pair of rear supporting rods are connected with the two sides of the middle of the bottom of the mounting plate respectively, the large opening ends of the pair of rear supporting rods are connected with the other pair of mounting bases respectively, the top ends of the rear inclined supporting rods are connected with the positions, close to the tops, of the corresponding front inclined supporting rods, and the bottom ends of the rear inclined supporting rods are connected with the lower portions of the corresponding rear supporting rods. Compared with a bending steel plate in the prior art, the bending steel plate has the advantages of being light in weight, high in overall torsional strength, not prone to breakage and good in reliability.

The utility model discloses a steering wheel rim torsion test fixture which comprises a support frame and at least two clamping structures, the clamping structures are arranged in a central symmetry mode, one end of each clamping structure is detachably installed on the support frame, and the other end of each clamping structure can abut against a steering wheel rim and is used for clamping and fixing the steering wheel rim. The connecting structure is mounted on one of the clamping structures and is used for being connected with an external force application device so as to test the torsional strength of the steering wheel rim; through the clamping structure, the steering wheel rim is efficiently and stably clamped and fixed, the overall universality and adaptability of the clamp are improved, the working efficiency is high, the adaptability is high, and the connecting structure provides a stable and reliable torque transmission path for the torsional strength test of the steering wheel rim; the accuracy and consistency of torque application in the test process are ensured, and the accuracy and repeatability of test data can be improved.

The application discloses a hollow commercial vehicle front axle and a manufacturing method thereof. The front axle is composed of an axle body and a steel plate spring seat. The axle body is a hollow structure obtained by reducing and upsetting an end portion of a seamless steel pipe, bending and pressing forming. The crossbeam and the bent neck of the axle body are thin-walled rectangular pipes with equal wall thickness and variable cross section. The fist part is a thick-walled rectangular cylinder with constant height and gradually narrowing width from the inside to the end portion. A strip-shaped hole is arranged on the outer end curved surface of the fist part and is welded and solidified by a welding plug. A concave limiting groove is arranged on the front side surface. The steel plate spring seat is composed of an upper cover and a lower support. The upper cover is clamped on the upper portion of the crossbeam, and the lower support is clamped on the middle portion of the crossbeam and covers the lower portion of the crossbeam. The hollow commercial vehicle front axle provided by the application can replace the existing forged, combined welded and punched and welded front axle, has light product weight, high bending and torsional strength, and is easy to match with the existing suspension system for vehicle mounting. The axle body has good forming quality, no defects such as folding and outer side cracks in the fist part inner cavity, and high shear performance.

The utility model relates to the technical field of buildings, and discloses an anti-corrosion building steel member which comprises a frame body, the frame body comprises lower channel steel, the upper end of the lower channel steel is attached to the lower end of upper channel steel through a connecting shell, a groove is formed in the connecting position of the lower channel steel and the upper channel steel, and transverse channel steel is installed on one side of the connecting shell. One end of the transverse steel channel penetrates through one side of the connecting shell till being attached to the inner surface of the groove, supporting structures are installed at one end of the lower steel channel and one end of the upper steel channel, one side of the transverse steel channel is attached to one side of the fixing structure, and the other side of the fixing structure is attached to one side of the connecting shell. The lower channel steel, the upper channel steel, the connecting shell and the transverse channel steel can be quickly disassembled and assembled through the fixing structures, the operation time is greatly saved, the torsional strength and rigidity can be improved through the supporting structures installed on one sides of the lower channel steel and the upper channel steel, the safety performance is improved, and the service life is prolonged.

The utility model relates to a wire harness fixing device which comprises a wire harness, a fixed part and a rotating part, the rotating part can rotate around a rotating axis relative to the fixed part, the fixed part is provided with a fixed block, the fixed block is located on the left side or the right side of the rotating part, the wire harness comprises a fixed end and a moving end, and the fixed end is connected to the fixed block; the moving end is connected to the rotating part, and an included angle is formed between the axis of the moving end and the rotating axis. According to the scheme, when the rotating part rotates, the wire harness is bent and twisted between the fixed end and the moving end, the wire harness fixing device can be applied to a narrow space by utilizing the breaking strength and the torsional strength of the wire harness, and the breaking strength and the torsional strength required by the wire harness fixing device are lower than those required by utilizing the single performance of the wire harness, so that the wire harness is prevented from being twisted off or broken off, and the service life of the wire harness fixing device is prolonged. And the wire harness is stable and durable in the use process.

The utility model relates to the technical field of engines, and provides a high-efficiency large-torque rotor engine. One of a plurality of turbine blades, slope blades and cambered surface blades is arranged in a rotor combustion chamber, the tangential stress area of a rotor is increased, dispersed and efficient combustion is achieved through an ignition channel, thrust in the rotating direction of the rotor is greatly increased, a crankshaft obtains larger torque, the overall acting power is also increased, and the service life of the rotor is prolonged. And the thrust-weight ratio of the rotor engine is improved. The crankshaft is matched with the rotor inner ring gear and the stator gear, so that power transmission of rotor acting is completed. The rotor inner ring gear and the rotor can adopt an integrated or split structure, and are connected through a polygonal embedded structure when being split, so that the torque resistance of the rotor is improved, the shear strength of a connecting bolt can be reduced, and the rotor is suitable for a high-power rotor engine structure. By improving the rotor structure, optimizing the blade design, adopting the polyhedral assembly structure and the like, the working efficiency, the torque and the overall performance of the engine are improved.

The utility model relates to the technical field of gliders, in particular to a carbon beam composite material wing structure. The airfoil comprises an airfoil main beam and foam layers located at the two ends of the airfoil main beam, the airfoil is of a structure which is thick in the middle and thin at the two ends on the whole, the airfoil main beam and the foam layers are wrapped with a layer of airfoil skin, and the airfoil main beam and the airfoil handle are connected in an inserted mode and fastened through a binder and a bolt; a weight reduction structure is designed in a non-bearing area of the wing handle, so that the overall weight of the structure is reduced; the modulus of the high-modulus carbon fiber main beam can reach 200Gpa, so that the deformation in a bearing state is effectively controlled, and the structural modal of the airfoil is improved; the high-modulus carbon beams and the wing handles are connected in an inserted mode, bonded through epoxy glue and connected in a fastened mode through bolts, and the bearing force of the wing surfaces is effectively transmitted to wing handle connecting points; the outer skin of the airfoil is made of high-strength carbon fiber one-way material, the laying direction and number of fibers are designed according to calculated stress, the 0-degree fiber direction, the 90-degree fiber direction and the + / -45-degree fiber direction are configured, and the torsional strength of the airfoil is improved on the premise that the bearing requirement is met.

The utility model discloses a kind of fixed rotary buckle type anti-slip structure, comprising: main component, the main component includes first associated piece and second associated piece.The utility model is provided with bevel, clamping block, clamping groove and ring, and the contact of second associated piece rotation connection process with bevel and press will make clamping block automatically move out and facilitate installation, clamping block enters the clamping groove and can be implemented anti-removal limiting reinforcement, two clamping blocks are opened by ring and can be conveniently disassembled by single hand moving out;The step can be implemented connection limiting reinforcement, convenient to use, improve the structural stability;Based on the above beneficial effect, it is provided with connecting rod, connecting slot, positioning rod and positioning slot, connecting rod enters connecting slot and can be implemented directional reinforcement between first associated piece and second associated piece, positioning rod is respectively inserted with two positioning slots and can be implemented positioning of positioning rod and facilitate device disassembly;The step, improved torsional strength, connection is stable, and anti-slip effect is better.

The invention discloses an underwater electronic module anti-vibration structure which comprises a base plate and a center column, the center column is arranged on the base plate, a first fixing plate and a second fixing plate are connected to the center column, and an electronic module is arranged between the first fixing plate and the second fixing plate. The first fixing plate is connected with the chassis through a supporting column; and a clamping block is arranged on the central column and is clamped with the electronic module through a hoop so as to fix the electronic module. According to the anti-vibration structure of the underwater electronic module, the center column and the supporting column are arranged on the chassis, the first fixing plate and the second fixing plate are fixedly connected to the center column, the electronic module is fixed, and the bending strength and the torsional strength of the structure are improved by adding the design of the supporting column, flange embedding and the like; by adding the anti-vibration pad, the clamping block and the hoop, resonance between the vibration isolation system and the electrical system is avoided. On the basis of relieving the system coupling vibration effect, the operation stability of the electronic equipment is improved.

The invention discloses a flange plate and shaft tube integrated composite material transmission shaft and a design method. The transmission shaft comprises a main body shaft tube, two flange plates arranged at the two ends of the main body shaft tube correspondingly and an outer stacking type reinforced connecting structure used for connecting the main body shaft tube and the flange plates. All the parts are integrally formed through an integral winding and laying process to form a continuous composite material structure. According to the method, in combination with installation space and design indexes, simulation models with different emphasis points are established for different structural areas of the flange plate and shaft tube integrated composite transmission shaft, and dynamic iteration is conducted on the layering proportion and the layering decline scheme through simulation calculation, so that collaborative optimization of the critical rotating speed and the torsional strength is achieved.

A 13-gear large-torque mechanical transmission comprises a first shaft and a first shaft gear which are coaxially connected, and further comprises a second shaft coaxial with the first shaft, a plurality of gear position gears are coaxially arranged on the second shaft, and gear position synchronizers corresponding to the gear position gears are further coaxially arranged on the second shaft, and the 13-gear large-torque mechanical transmission is characterized in that second shaft spline pads are coaxially arranged between the gear position gears and the second shaft; a plurality of grooves are evenly distributed in the inner circumference of each two-shaft spline pad, limiting grooves are formed in the peripheries of the two shafts corresponding to the grooves, hexagonal keys parallel to the axes of the two shafts are arranged in the spaces between the grooves and the corresponding limiting grooves, top gaps are reserved between the hexagonal keys and the top faces of the grooves, and side gaps are reserved between the hexagonal keys and the opposite side faces of the grooves. Through reasonable arrangement of component structures, the fatigue life and static torsional strength of the 13-gear transmission are integrally improved, the matching requirement of a large-torque engine is met, and the requirements of vast customers for transportation efficiency and fuel economy are met; meanwhile, the device can be applied to 13-gear same-series products, and the purpose of reducing the market failure rate of the same-series products is achieved.

The utility model relates to the technical field of building materials, in particular to a high-strength torsion-resistant steel column which comprises a column top plate, a column body and a column bottom plate which are sequentially connected from top to bottom, the column body comprises a first vertical plate and a second vertical plate which are parallel to each other, and the first vertical plate and the second vertical plate are connected through a third vertical plate. Supporting ribs opposite in position are arranged on the opposite faces of the first vertical plate and the second vertical plate, the supporting ribs arranged on the first vertical plate and the supporting ribs arranged on the second vertical plate are connected through a plurality of position-adjustable inclined supporting pull strips, inclined supporting plates are arranged between the supporting ribs and the third vertical plate, long-strip-shaped grooves are formed in the supporting ribs, and the long-strip-shaped grooves are connected with the inclined supporting pull strips. The inclined strut brace is connected with the long-strip-shaped groove through a bolt and makes contact with the first vertical plate and the second vertical plate. The arrangement density of the diagonal bracing braces can be adjusted according to the torsional strength requirement, and a plurality of stable triangular structures are formed between the diagonal bracing plates and the column body, so that the bearing capacity and the torsional rigidity of the steel column are remarkably improved, and the high requirement of a building for structural safety and stability is met.

The utility model relates to the technical field of stud strength detection, and provides a stud strength detection device which comprises a bottom plate, a plurality of stand columns and a platform, the stand columns are fixed on the surface of the bottom plate, the platform is arranged at the tops of the stand columns, an installation switching assembly is arranged on the platform, a detection assembly is arranged at the bottom of the platform, and the detection assembly comprises a lifting motor. The lifting motor is arranged on the surface of the platform, the bottom of the platform is rotationally connected with a lifting screw, the lifting screw is connected with the output end of the lifting motor, and a pair of round rods is arranged at the bottom of the platform and located on the two opposite sides of the lifting screw. According to the technical scheme, the problems that certain pressure needs to be applied to the other end of the bolt, the bolt is not axially positioned, the bolt is easy to axially move in the detection process, the detection accuracy of the torsional strength of the bolt is influenced, the coherence is poor, the time for assembly and disassembly is much, and the detection precision is high in the prior art are solved. And the efficiency is low.

The utility model discloses a coal mine sampling device, which relates to the technical field of sampling devices, and comprises a sampling barrel, a sampling pipe, a sampling pipe and a sampling pipe, the spiral shaft is rotationally mounted in the sampling barrel, and a gap is reserved between the spiral shaft and the inner wall of the sampling barrel; the discharge hole is formed in one end, far away from the sampling hole, of the sampling barrel; the power source is mounted at one end of the sampling barrel and is in transmission connection with the spiral shaft; the at least one reinforcing rib is fixed to the edge position of the spiral shaft in the axial direction, and the reinforcing rib extends into the gap in the rotating direction of the spiral shaft; by means of the reinforcing ribs fixed to the edge of the spiral shaft in the axial direction, the overall rigidity and torsional strength of the spiral shaft are improved, the spiral shaft is effectively prevented from deforming or being subjected to torsional fatigue due to the action of torque and bending moment in the long-distance conveying process, and therefore the service life of the spiral shaft is remarkably prolonged.

To provide a motor pump that can ensure the torsional strength of the mounting section of the main shaft to which the impeller is attached, while suppressing the generation of fluid vortices and backflow downstream of the main shaft. [Solution] The motor pump comprises a first impeller, a main shaft to which the first impeller is fixed, a motor for rotating the first impeller, and a casing that houses the first impeller and the main shaft and has a fluid passage through which fluid flows. The downstream end of the main shaft is positioned in the fluid passage, and the main shaft has a mounting portion to which the first impeller is attached, and a smaller diameter portion positioned downstream of the mounting portion and having a smaller diameter than the mounting portion.

According to the testing device, a to-be-tested battery pack is installed on a second support, a first support restrains the second end of the second support, and the second end of the second support has the freedom degree of rotating around the long axis of the second support. During testing, the first bracket applies two load forces in opposite directions to the second bracket, so that the second end rotates around the long axis of the second bracket, and the to-be-tested battery pack mounted on the second bracket is subjected to a torsion force along with the rotation of the second bracket, thereby performing a torsion test on the to-be-tested battery pack. The working condition of the to-be-tested battery pack on the non-paving road is accurately reproduced, whether the torsional strength of the to-be-tested battery pack can meet the working condition requirement or not is evaluated, and then the reliability of the strength safety design of the to-be-tested battery pack can be accurately evaluated.

According to the computerized embroidery machine disclosed by the invention, vibration caused by rotation of the eccentric cam is inhibited through the first balance structure, so that the operation stability of the computerized embroidery machine is improved, and the precision of the computerized embroidery machine is ensured. The auxiliary shaft is located outside the machine shell and located above or below the machine shell, so that the auxiliary shaft and the first balance structure are not affected by the distance between the two adjacent machine heads, installation is convenient, and therefore the assembling efficiency of the computerized embroidery machine is improved. Vibration caused by movement of the presser foot driver and the needle bar driver is restrained through the balance block, so that the operation stability of the computerized embroidery machine is improved, and the precision of the computerized embroidery machine is guaranteed. The diameter of the auxiliary shaft is larger than or equal to that of the upper shaft, the bending strength and the torsional strength of the auxiliary shaft can be improved by increasing the diameter of the auxiliary shaft, and therefore the auxiliary shaft can bear larger loads when bearing torque and vibration generated by the eccentric cam, and deformation caused by the loads is reduced.

The invention discloses an internal insulation steel pipe special cable and a four-groove roller reducing mill thereof, and relates to the technical field of cables, the cable comprises a steel pipe layer and convex ribs integrally processed on the outer surface of the steel pipe layer; the reducing mill comprises a fixing ring; the rolling assembly is rotationally installed in the fixing ring, the rolling assembly comprises a rotating ring and four rollers distributed in the rotating ring in a surrounding mode, and a gap used for extruding a steel pipe layer of the cable to form a convex rib is formed between every two adjacent rollers; and the driving assembly is used for driving the rolling assembly to rotate in the fixing ring so as to form a convex rib which extends in the axial direction and is of a linear structure or a spiral structure on the surface of the cable. According to the invention, through the relation between the revolution speed of the roller and the advancing speed of the cable, the convex ribs with axial linear structures or the convex ribs with different leads and spiral structures can be flexibly processed, the torsional strength, the heat dissipation efficiency and the installation guidance quality of the special cable in different laying environments are improved, and the customization requirements of high-end markets are met.