18results about How to "Stable preload" patented technology

The high-precision piston rod connecting structure comprises a piston rod, the upper end of the piston rod is connected with a piston body, the lower end of the piston rod is connected with a crosshead, the upper end of the crosshead is connected with a positioning flange with a center hole, and the lower end of the piston rod is a reducing end transited through a conical surface section. The reducing end penetrates through the center hole of the positioning flange and is stretched and locked by a first fastening structure; the upper section of the center hole of the positioning flange is a taper hole matched with the conical surface section of the piston rod; the upper end of the piston rod penetrates into a center hole of the piston body, is stretched and locked by a second fastening structure and is provided with an anti-rotation structure. Automatic centering is achieved through conical surface matching, stable pre-tightening force is provided in cooperation with a double-fastening structure, the problems that a traditional connecting structure is insufficient in precision and poor in locking reliability are effectively solved, the operation precision and stability of a compressor are greatly improved, and meanwhile the compressor connecting structure has the advantages of being convenient to install and maintain and long in service life.

The utility model discloses a high-temperature and high-pressure hard sealing three-eccentric center butterfly valve, and relates to the field of butterfly valves. In petrochemical engineering, electric power and other high-temperature and high-pressure industrial scenes, a traditional butterfly valve has the problems of sealing failure, large friction torque, influence of thermal expansion on pre-tightening force and the like. The three-eccentric butterfly valve comprises a valve body, a valve rod, a valve plate, a valve seat and a bottom end cover, the axis of the valve plate, the axis of the valve rod and the sealing face of the valve seat form a three-eccentric structure, the valve plate comprises a plate body, a metal winding gasket, an elastic sealing ring and a pressing ring, and the outer circumferential face of the elastic sealing ring and the inner circumferential face of the valve seat serve as sealing faces for closing the butterfly valve. Zero-friction contact type sealing is achieved in the closing process of the valve through the three-eccentric structure, the sealing life is greatly prolonged, the opening and closing torque is reduced, the leakage problem caused by uneven sealing and machining errors of a traditional butterfly valve is solved through the double-sealing combination of the metal winding gasket and the elastic sealing ring, and the sealing performance of the butterfly valve is improved. The sealing stability and reliability are effectively improved, and the service life is prolonged.

The utility model discloses a zero-return-difference zoom compensation lens group driving device with stable pre-tightening force, which belongs to the technical field of cam transmission and comprises a zoom lens group, a compensation lens group, a linear guide rail pair, a cam shaft and a U-shaped spring assembly. The zoom lens group and the compensating lens group are mounted on the linear guide rail pair, and the linear guide rail pair limits the zoom lens group and the compensating lens group to only move along a straight line; driving force is applied to the zoom lens group and the compensating lens group through the cam shaft, and the cam shaft drives the zoom lens group and the compensating lens group to move back and forth along the linear guide rail pair when rotating forwards or backwards; the stable pre-tightening force is applied to the zoom lens group and the compensation lens group through the U-shaped spring assembly, so that the zoom lens group and the compensation lens group are always in contact with the same groove surface of the respective cam groove. The utility model is mainly applied to the design and manufacture of zoom optical lenses, and has the characteristics of compact structure, easy processing, and simple installation and adjustment.

This utility model relates to the field of battery technology and discloses an adjustable steel strip mechanism, a battery module, and a battery pack, comprising: a steel strip body; a rotating structure rotatably configured, the steel strip body being wound around the rotating structure; and an adjusting structure pulsatorically connected to the rotating structure, the adjusting structure being adapted to rotate the rotating structure to drive the steel strip body to extend or retract from the rotating structure. This utility model allows for the adjustment of the extension length of the steel strip body according to the size of the battery module, improving compatibility with the battery module, simplifying the process flow, and reducing material consumption. Furthermore, when the battery cells expand or contract, the preload on the battery pack can be adjusted by regulating the extension length of the steel strip body, ensuring that the steel strip body provides a stable preload to the battery pack, thereby ensuring the stability and accuracy of the position of each battery cell.

The utility model discloses a material compacting device of loader, including compaction device, the bottom surface fixed connection of compaction device has the connecting disc, the bottom surface fixed mounting of connecting disc has the mounting disc, the bottom surface fixed connection of mounting disc middle has the thread bush, the inside thread connection of connecting sleeve has the compaction board, still include: the both sides surface symmetrical of thread bush is provided with the fixed assembly that penetrates, wherein, the fixed assembly that penetrates includes the connecting sleeve fixed connection with thread bush, wherein, the inside fixed assembly that penetrates is connected with the thread penetration rod, the both sides surface sleeve of thread penetration rod is equipped with rubber ring, one side surface of rubber ring is fixedly connected with connecting sleeve, through setting up the fixed assembly that penetrates, when can be more convenient to the compaction board replacement, can make to the compaction board replacement speed to a certain extent to improve to can, thereby reduce the downtime and the increase of time cost.

The application belongs to a pressure reducing valve structure, aiming at the problems of large volume and weight, large output pressure fluctuation and easy leakage or failure under complex space environment of the existing pressure reducing valve in the satellite electric propulsion system, a micro pressure reducing valve for the satellite electric propulsion system and a satellite electric propulsion system are provided, the primary throttling pressure reduction, the secondary throttling pressure reduction and the diaphragm feedback pressure regulating structure are integrated in the same shell, the high-pressure propellant is gradually reduced in pressure and then stably output, and the pressure fluctuation caused by single-stage large pressure difference pressure reduction is reduced. The diaphragm links the secondary valve core assembly through the top rod, the secondary valve port opening degree is adaptively adjusted according to the pressure change of the low-pressure cavity, the gas supply pressure precision and the thruster working stability are improved. The pressure regulating spring and the adjusting piece can set the output pressure, and the adaptability is improved; the pre-tightening elastic piece and the reset spring help to ensure the opening and closing response and the sealing reliability. The application has compact structure, can reduce the leakage points, and meets the requirements of miniaturization, light weight and high reliability of the satellite electric propulsion system.

This invention discloses an automated crop planting device for cuttings, relating to the field of agricultural machinery. It includes a planting cylinder and a lifting platform. The upper part of the planting cylinder has a seedling delivery component within a seedling separation chamber. Its trumpet-shaped support plate, with its wide opening facing upwards, accommodates seedlings. A concentric seedling separation plate at the bottom is driven to rotate by an independent motor. Mechanical single-plant separation is achieved through seedling holes and notches. Seedlings fall under gravity through the delivery tube into the lower cutting chamber. The rotation speed of the seedling separation plate is linked to the walking speed and the cutting frequency to ensure proper spacing between plants. The cutting chamber is equipped with an adaptive cutting component. Seedlings fall between a pair of synchronously rotating inward-facing conveying gears, and are elastically clamped by a tension spring to adapt to irregular shapes and avoid damage. Simultaneously, the V-shaped clamp of the vertical cutting component moves downwards to correct tilting, achieving precise vertical insertion of seedlings into the soil. This device realizes mechanical single-plant separation, elastic adaptive clamping, and vertical cutting, improving operational efficiency and survival rate.

The invention discloses stainless steel wire straightening, calendering and automatic winding equipment which comprises a rack and further comprises a steel wire coil pay-off mechanism, a first tension guide wheel mechanism, a stress straightening mechanism, a calendering mechanism, a second tension guide wheel mechanism, a wire arranging wheel mechanism and a flat wire winding mechanism which are arranged on the rack. The steel wire coil pay-off mechanism is used for outputting a whole coil of stainless steel wires; the tension guide wheel mechanism I is used for adjusting tension and guiding the steel wire to be conveyed to the stress straightening mechanism; the stress straightening mechanism is used for circumferentially twisting the conveyed steel wire so as to release the multi-dimensional stress of the steel wire; the calendaring mechanism is used for calendaring the steel wire subjected to stress straightening into a flat shape; the second tension guide wheel mechanism is used for adjusting tension and guiding the rolled flat steel wire to be conveyed to the wire arranging wheel mechanism. The wire arranging wheel mechanism is used for guiding the steel wire to be wound neatly and tightly in the winding process. And the flat wire winding mechanism is used for winding the calendered flat steel wire.

The utility model discloses a kind of for C purlin reinforcing structure, relate to purlin technical field.The purlin for roof reinforcement, including purlin and lap joint component, the inside of purlin is provided with inner lining C type steel one and inner lining C type steel two;Lap joint component is set on inner lining C type steel one and inner lining C type steel two, and lap joint component includes hexagonal mounting hole, screw rod, connecting column, limit plate and nut, and six groups of hexagonal mounting hole are set on inner lining C type steel one and inner lining C type steel two and linear distribution, and screw rod is set in the inside of hexagonal mounting hole, and the bottom of screw rod is fixedly installed with connecting column, and the bottom of connecting column is fixedly installed with limit plate.The position of inner lining C type steel is adjusted by nut rotation through the setting of inner lining C type steel one, inner lining C type steel two and lap joint component, can accurately control reinforcing effect, and the process of adjustment is simple and fast, avoids complex welding or reinforcing work, greatly reduces construction difficulty.

This invention discloses a cold-deformation-based threaded fastener, comprising component one and components four, three, and two sequentially mounted on the screw of component one. Component four is a collar structure with a variable diameter section and a deformation section; component three is a compression collar structure; component two is a nut structure; the outer edge of the contact end face of component three and component two has a stepped ring with a stepped groove structure, and the contact end face has a raised ring formed by a protrusion. In the combined state, the raised ring of component two and the stepped ring of component three are in clearance fit. In this invention, component three presses component four into the external thread of component one. The entire structure provides a stable preload force, unaffected by external factors, solving the problem of large preload fluctuations in traditional threaded fasteners. The combination structure of components two and three solves the problem of overly complex installation processes caused by too many components in engineering applications. During installation, component three does not rotate with component two, resulting in a more stable and reliable anti-loosening effect.

The application discloses a marine low-speed diesel engine propulsion system safety monitoring instrument, and relates to the technical field of ship safety monitoring. The lower side of the outer wall of the base is provided with a positioning block one, the side of the diesel engine body close to the base is provided with a groove one, the groove one is matched with the positioning block one, the lower side of the outer wall of the positioning block one is provided with a mounting groove, the inside of the mounting groove is provided with a pressure sensor, the middle part of the outer wall of the base is provided with a mounting hole, the inside of the mounting hole is provided with a pre-tightening bolt, the inner wall of the base is provided with a shearing groove in the radial direction, and the inside of the shearing groove is provided with a buffer block in interference. The positioning block one, the groove one, the pre-tightening bolt, the pressure sensor, the acceleration sensor and the temperature sensor are installed, the function of stable information collection is realized, the base installation pre-tightening force can be maintained in the vibration working condition through the self-locking of the positioning block one and the groove one, and the equipment information collection accuracy and stability are improved.

This invention discloses a screw fracture prevention method based on vibration testing of wall-mounted products, comprising: selecting screws that meet predetermined standards; using an accelerometer to monitor the vibration value at the installation point of the wall-mounted equipment in real time; adjusting the input control of the test bench; conducting a pre-test before the formal test, and then tightening the screws a second time after the pre-test; during the formal test, monitoring the root mean square value of acceleration or the peak value of the time-domain signal at the equipment installation point in real time, judging the screw fracture risk based on the root mean square value of acceleration or the peak value of the time-domain signal, and terminating the test when a fracture risk is detected. By adjusting the input control of the test bench, the vibration input level is controlled to prevent overtesting, reducing the risk of screw fracture due to vibration overload from the source. Pre-testing and secondary tightening eliminate preload loss, reduce the risk of stress concentration, and improve the uniformity and stability of preload. This achieves early warning of fracture risk, gaining time for downtime and loss mitigation.

The utility model relates to the technical field of roof communication towers, in particular to a ballasting type roof communication tower which comprises a tower body, a fixing flange is fixedly connected to the tower body and connected with a tower base, a fixing screw is arranged in the tower base in a penetrating mode, one end of the fixing screw penetrates through the fixing flange and is in threaded connection with a fixing nut, and the other end of the fixing screw is in threaded connection with the tower base. An installation flange is fixedly connected to the tower body, an installation frame used for installing an antenna is fixedly connected to the installation flange, a lightning rod is installed on the installation frame, foot blocks are connected to the side wall of the tower footing, the number of the foot blocks is at least three, installation screws are arranged in the foot blocks in a penetrating mode, and one ends of the installation screws extend out of the foot blocks and are in threaded connection with installation nuts. The mounting nuts abut against the foot blocks, the cross section of each foot block is in a T shape, a pressing block is jointly connected between the two foot blocks in an abutting mode, and the effects that damage to the building structure is reduced, and the communication tower is convenient to move are achieved.

The utility model discloses an expansion bolt capable of adjusting pretightening force, which relates to the technical field of bolts and comprises a threaded rod, the middle of the threaded rod is in threaded connection with an adjusting nut, the bottom of the threaded rod is sleeved with an expansion pipe, the top of the expansion pipe is sleeved with a limiting ring, one side of the limiting ring is provided with a scale plate, and the other side of the limiting ring is provided with a screw rod. An arc-shaped positioning plate is fixedly arranged on one side of the threaded rod, a limiting assembly for limiting the adjusting nut is arranged at the top of the threaded rod, a conical head is fixedly arranged at the bottom end of the threaded rod, and the maximum outer diameter of the conical head is larger than the inner diameter of the expansion pipe; the utility model has the beneficial effects that the expansion amount of the expansion pipe can be accurately controlled by observing the moving distance of the arc-shaped positioning plate on the surface of the threaded rod and combining with the arranged scale plate, so that the pretightening force is adjusted, the condition of insufficient or interference pretightening force is avoided, and the use of a user is facilitated.

The utility model discloses a modular building unit structure, including left connecting piece, right connecting piece and middle connecting piece, left and right connecting piece is L type, and the short side of L type is equipped with threaded hole, and the long side of L type is equipped with first via hole and steel wire via hole, the middle connecting piece is U type, and the surface is equipped with corresponding through -hole. Two building unit structures are 180 degrees overturning and central symmetry, and are primarily connected through the bolt, and then are enhanced in structure through the mode that steel wire rope passes through steel wire via hole, and there is height difference among adjacent steel wire via holes. The locking structure in the cavity of middle connecting piece contains spin nut, compensation spring and clamping device, and the clamping device is semicircular metal ring with external thread and pointed end spur. When installing, after bolt connection, steel wire rope is fixed through locking structure, and compensation spring is compressed to make steel wire rope inclined pull, provide pre -tightening force, improve overall strength and impact resistance.

The utility model relates to fire fighting equipment detection technical field discloses a kind of fire door anti-spraying water impact tester, including fire hose, the inside left side of fire hose is fixedly connected with round, the inside fixedly connected with cylinder in round, the outside sliding connection of cylinder has slip ring, the outside right side of slip ring is fixedly connected with spring a.In the utility model, first, slip ring is pushed back under the action of water flow pressure and is slid on cylinder to round inside, let water flow pass smoothly, when water flow appears backflow trend, slip ring will be quickly reset under the action of spring a elasticity, form tight seal, to block reverse water flow, simultaneously, when rotating handle on top layer moves down, water flow resistance increases by thread transmission to drive pressing plate to move down, inside flow cross-sectional area reduces at this time, water flow resistance increases;Conversely, the extrusion force of water decreases, water pressure reduces, it is convenient to adjust and change hose pass diameter, promote the progress of experiment.

The invention relates to the technical field of display detection, and discloses a detection device for a display of an all-in-one computer, which comprises a working table, and further comprises a base arranged at the bottom of the working table and used for supporting the working table; the plurality of brackets are mounted above the workbench to form a frame structure and form a detection cavity; the baffles are installed on the frame of the support, and a camera is installed on the support and used for shooting the displayer. The clamping action and the cleaning function are linked through a gear and rack mechanism, when an air cylinder drives a clamping plate assembly to move to clamp a displayer, a brush cylinder is automatically driven to rotate to clean a screen through meshing of a rack and a gear, and synchronous cleaning is achieved in the clamping operation process; the positioning, fixing and cleaning processes which are originally required to be performed step by step are integrated into a coherent automatic process, so that the cycle time of single detection is greatly shortened, and the detection efficiency of the display on the production line is remarkably improved.

A pre-stretching screw rod relates to the technical field of screw rod pre-stretching, which comprises a ball screw rod, a fixed end assembly rotatably connected to the fixed end, a pre-stretching end assembly rotatably connected to the pre-stretching end, a bearing seat, a bearing installed in the bearing seat, a bearing sleeve sleeved on the pre-stretching end to lock the ball screw rod in the bearing seat, a rear spacer ring installed in the bearing seat, the rear spacer ring sleeved on the pre-stretching end to press the bearing to lock the bearing in the bearing seat, the rear spacer ring pressing the bearing to lock the position, a first locking nut sleeved on the outer end of the pre-stretching end, the first locking nut being in threaded connection with the pre-stretching end, an adjusting nut installed in the bearing seat and sleeved on the rear spacer ring, the adjusting nut being clamped between the first locking nut and the bearing, one end of the adjusting nut pressing the bearing, the other end of the adjusting nut pressing the first locking nut, the adjusting nut providing dynamic pre-tightening force adjustment, the first locking nut and a second locking nut being fixed through threaded locking, and the pre-tightening force being ensured to be stable for a long time.