133results about How to "Guaranteed preload" patented technology

The invention discloses a combined hydraulic pre-tightening locking device and a hard alloy compound roller which is assembled by using the device. The device comprises a pre-tightening nut, a T-shaped backing ring, a pre-tightening combined gasket formed by a pair of semicircles, a plurality of force-transferring pillars, a hydraulic flange, an annular backing ring, an annular piston and a sealing ring, wherein the pre-tightening nut is provided with an external screw thread and a plurality of uniformly distributed axial through holes; the force-transferring pillars are matched with the axial through holes and can move axially; the hydraulic flange is matched with the external screw thread of the pre-tightening nut; an external cylindrical side of the hydraulic flange is provided with anoil hole communicated with the annular piston; the annular piston is positioned in a cylinder in the hydraulic flange and the end face of the annular piston is contacted with the lower end face of the annular backing ring; and the sealing ring is arranged between the annular piston and the cylinder of the hydraulic flange. The device can be used for reliably pre-tightening parts on a shaft as well as replacing a hydraulic nut. The device is free from working under a pressure, is free from the long-term influences of working ambient temperature, oil, steam, and the like, has long service life,and is simple in structure and low in cost.

The invention discloses an electric folding device for an automobile outside rearview mirror. The device comprises a shell (6), a substrate (3), a base (2), a pin shaft (7), an electric driving unit used for driving the shell (6) to rotate relative to the base (2) around the axis of the pin shaft (7), a spring arranged on the pin shaft (7) in a sleeving mode, and a connecting piece (4) which makes the shell (6) manually rotate relative to the substrate (3), and a cam assembly is arranged among the connecting piece (4), the substrate (3) and the base (2). In the electric folding process, the cam assembly is driven by the electric driving unit and enables the substrate (3) to lift up and rotate along the pin shaft (7) through relative sliding of the cam assembly and the electric driving unit and elastic force of the spring (5). The electric folding device is compact in structure, the anti-shaking performance of the rearview mirror is better, the electric folding process is smoother, and the phenomenon of folding failure is not likely to happen.

The invention provides a three-directional friction adjustable strong-impact-resisting vibration isolator comprising a base, an upper cover, a vibration isolation spring component, a damping buffering component and a shock insulation component, wherein the damping buffering component comprises a friction sheet and a friction ring and the inner surface of the friction ring contacts with the outer surface of the friction sheet. The shock insulation component comprises a rubber block, a metal ring and a gasket, wherein the friction ring is arranged on the metal ring in a sleeved mode. The rubber block is clamped between the metal ring and the gasket, wherein the gasket contacts with the base or the upper cover. The three-directional friction adjustable strong-impact-resisting vibration isolator is strong in shock insulation performance and particularly suitable for a vibration isolation system in military electronic equipment. Besides, the three-directional friction adjustable strong-impact-resisting vibration isolator further has the advantages of bringing convenience to the spacial three-directional friction damping regulation, being anti-abrasive, being corrosion resisting and the like.

The invention relates to a clamping and positioning device of a K-shaped linear ultrasonic motor based on the continuous amplitude transformer principle, belonging to the technical field of ultrasonic motors. The clamping and positioning device comprises an opening outline border (6) and a supporter. On one hand, the device ensures that a stator can not move on the motion direction of a motor guide rail and can not rotate on three directions, thus improving the stability of motor structure, ensuring the stability of stator movement and improving load capacity and operation efficiency; and on the other hand, the device can adjust prestress between the stator and a rotor, which is convenient to measure the prestress and ensures that prestress applied in the installation process satisfies design requirements.

A fastening connection structure comprises a main body, an auxiliary body and a fastening connection assembly. The fastening connection assembly comprises a screw and a rotation stop sleeve. A taking-out device used for taking out the rotation stop sleeve is arranged on the hole wall of a first rotation stop hole and / or the rotation stop sleeve. The screw penetrates through the auxiliary body to be mounted on the main body. The rotation stop sleeve is mounted outside a rotation stop butting part of the screw and inside the first rotation stop hole and is limited in the axial direction. A first rotation stop part on the outer circumference of the rotation stop butting part of the screw is matched with a second rotation stop part on the hole wall of a rotation stop through hole of the rotation stop sleeve to restrain rotation, relative to the rotation stop sleeve, of the screw. A third rotation stop part on the outer circumference of the rotation stop sleeve is matched with a fourth rotation stop part on the hole wall of the first rotation stop hole to restrain rotation, relative to the auxiliary body, of the rotation stop sleeve. The screw, the auxiliary body and the main body are mounted together in a non-rotatable mode. The fastening connection structure has the advantages that the situation that the screw rotates reversely and consequentially is loosened is prevented, and the rotation stop sleeve can be taken out of the first rotation stop hole conveniently, rapidly and reliably.

The invention relates to a back-to-back mounting method and a pre-fastening structure of angular contact ball bearings for a reducer, and the pre-fastening structure can provide a pre-fastening force for the back-to-back assembled angular contact ball bearings. When the back-to-back mounting method is adopted to mount the bearings, a pre-fastening force F0 required by the bearings is determined according to the models of the bearings, then the deformation quantity delta required by the bearings is calculated according to the pre-fastening force F0 required by the bearings, and finally, the thickness d of gaskets required to be cushioned is determined according the dimensional matching relationship between all adaptive parts during installation of the bearings. After the finally selected gaskets, bearings and other parts are assembled in place according to the designed positions, the pre-fastening force of the bearings can be equal to the designed value F0.

The invention relates to an annular array energy transducer for pipeline axial residual stress detection based on a critically refracted longitudinal wave method. A critically refracted longitudinal wave method is utilized to realize axial residual stress detection of a circumferential array of an annular pipeline; and a plurality of organic glass wedges are uniformly assembled and distributed at an inner ring of a fixed flexible sleeve. When the annular array energy transducer works, the fixed flexible sleeve is wound the circumference of the annular pipeline and is fastened; and a certain pretightening force is added according to the radius of the pipeline. Besides, a plurality of pairs of piezoelectric transducers are assembled in each of the organic glass wedge, so that an axial mode of one sending and one receiving is formed, wherein the mode has a property of equipartition with 360 degrees; and moreover, a first critical angle is formed between each of the energy transducer and a contact tangent plane of each of the organic glass wedge. According to the invention, on-line detection on annular pipelines with different radiuses is realized; and the annular array energy transducer has characteristics of high sensitivity and convenience for using and the like; besides, the annular array energy transducer is especially suitable for detection on some large petroleum transmission pipelines.

The invention discloses an external-adjustable constant-pressure pre-tightening device for a motorized spindle. The external-adjustable constant-pressure pre-tightening device comprises a shell, a bearing support system and a pre-tightening adjustment system, wherein the bearing support system is consist of a bearing, an inner space ring, an outer space ring, a bearing block, a linear bearing, a fastening bolt and the like; the pre-tightening adjustment system is composed of a spring baffle plate, a bolt, a connecting plate and an adjusting bolt; the spring baffle plate is mounted in the shell, and the ear part of the spring baffle plate is connected to the connecting plate through the bolt; the adjusting bolt extends out of a rear cover of the motorized spindle through a center hole of the connecting plate. During working, the pre-tightening force applied to the bearing can be adjusted in real time by rotating the adjusting bolt. As an external-adjustable constant-pressure pre-tightening force mechanism is arranged between the shell of the motorized spindle and the bearing block, the axial preload of the bearing of the motorized spindle can be adjusted in real time according to different rotating speeds and different loads, the motorized spindle can be always in an optimal working condition, the internal heating phenomenon of the bearing is reduced, and the service life is prolonged. The external pre-tightening force is adjustable, so that the operation is convenient, and meanwhile an external complex device needed by the way that the pre-tightening force is adjusted through electromagnetism or hydraulic pressure is avoided.

The invention discloses an air tightness detection clamp, which relates to the machining field of the mechanical tool. The air tightness detection clamp comprises an air inlet pipe connector (5), wherein the air inlet pipe connector (5) is hinged with a clamping part (2); the clamping part (2) is provided with a protruded claw part (2-1) at the front part of a hinged position, and is provided with a handle part (2-2) at the rear part of the hinged position; and a shaft pin (2-3) is arranged between the hinged position and the handle part (2-2), the shaft pin (2-3) is movably plugged into a groove arranged on the air inlet pipe connector (5), and a spring (4) is arranged between the shaft pin (2-3) and the groove. Compared with the prior art, the problems of the existing air tightness detection tool that the efficiency is low and the labor intensity is large can be solved.

The invention relates to the technical field of saline-alkali soil nursery stock protection, and provides a saline-alkali soil tree protecting device which comprises a supporting frame and a mulching film. The supporting frame comprises at least three clamp hoops, a clamp hoop ribbon which is adjusted and fixed through a ribbon locking device is connected between every two adjacent clamp hoops, and a supporting rod is hinged to a hinging part of a clamp hoop hinging lifting lug on each clamp hoop. Each supporting rod comprises an inner supporting rod body and an outer supporting rod body connected with the inner supporting rod body in a sleeving mode, wherein a directional locking device is arranged at the upper end of the outer supporting rod body, a supporting rod base is hinged to the lower end of the outer supporting rod body, a water injecting pipe penetrates through the supporting rod base, and the output end of the water injecting pipe communicates with a water seepage and ventilation pipe network. Each base table is sleeved with a mulching film tightening clamp hoop, and a tree base is sleeved with a mulching film binding band. The supporting height and surrounding diameter of the saline-alkali soil tree protecting device can be automatically adjusted along with growth of a tree, the tree is effectively supported and protected, the breathing requirement of the root is met, watering and fertilizer and pesticide applying can be conveniently conducted on the tree, and the mulching film can be effectively protected.

The invention discloses a camera assembly and electronic equipment. The camera assembly comprises a shell, a movable part and a first magnetic assembly, and a light through hole is formed in one sideof the shell; the movable part is located in the shell, the movable part comprises a camera module and a movable support, the movable support is arranged on the side, away from the light through hole,of the camera module, and the movable support is rotatably matched with the shell; and the first magnetic assembly comprises a first magnetic piece and a second magnetic piece, the first magnetic piece is arranged on the movable support, the second magnetic piece is arranged on the side wall of the side, opposite to the light through hole, of the shell, and the first magnetic piece and the secondmagnetic piece are magnetically attracted to ensure rotatable connection between the movable support and the shell. The camera assembly has the advantage of being stable in shooting.

The invention discloses a high-performance tripod head. The high-performance tripod head comprises a tripod head motor, a tripod head support connected with one end of the tripod head motor, and a camera connected with the other end of the tripod head motor. The tripod head motor comprises a motor shell, a stator assembly arranged in the motor shell, a rotor assembly and shafting parts. The rotor assembly and the stator assembly are arranged coaxially. The shafting parts penetrate through the centers of the stator assembly and the rotor assembly from one end of the motor shell. The motor shell comprises a front cover and an outer housing connected with the front cover. The rotor assembly is annular and comprises an outer magnet attached to the inner wall of the outer housing, an inner magnet arranged in an inner ring of the outer magnet, and an inner magnet yoke arranged in an inner ring of the inner magnet. The outer magnet is of a sheet structure. The outer magnet and the inner magnet are arranged correspondingly, so that magnetomotive force forms a series connection form. The number of magnetic pole pairs of the outer magnet and the inner magnet is at least one. The stator assembly is arranged between the outer magnet and the inner magnet. The problems that torque ripple of a traditional tripod head motor is large, shake cannot be eliminated effectively, and the tripod head imaging effect is influenced are solved.

The invention relates to a device for grinding and cleaning the end face of a pipeline socket, and aims to provide a device for grinding the pipeline socket, wherein the device is low in labor intensity and high in grinding quality. The device comprises a grinding machine, a motor (1), a trolley (2), rails (3) and a driving device. The grinding machine comprises a grinding head (4), a transmission shaft (5) and a bottom plate (6). The grinding head is fixed to the transmission shaft, and a belt pulley (7) is fixed to the other end of the transmission shaft. The transmission shaft is arranged on the bottom plate through a bearing pedestal (8). An output shaft of the motor is connected with the belt pulley through a belt (9). The bottom plate and the motor are both fixed to the trolley. Idler wheels are arranged at the lower end of the trolley and located on the rails. The extending direction of the rails is perpendicular to the axis of the transmission shaft. The driving device is used for driving the trolley to move on the rails.

The invention relates to an aeroengine blade vibration test device, and belonging to the technical field of engine blade test devices. The aeroengine blade vibration test device comprises a device main body arranged on a shaking table, wherein a rotating disc for inserting blades is arranged outside the device main body; a rear cover for driving the rotating disc to rotate is arranged inside the device main body; a rotating disc is arranged on one side of the rear cover, and a clamping disc is arranged on the other side of the rear cover; a rear cover chamber passing through a pressing block is arranged along the height direction of the rear cover; and the rotating disc is provided with a rotating disc chamber communicating with the rear cover chamber and a mortise groove for inserting blades. The aeroengine blade vibration test device is suitable for testing blades of various structures, can realize vibration tests of the blades at any angle, and has high test accuracy and accuracy.

The invention discloses a thread core-pulling rivet and a riveting method using the same. The thread core-pulling rivet comprises a rivet rod with a limiting cap, a driving ring mounted on the rivet rod in a threaded mode and a rivet sleeve arranged on the rivet rod in a sleeving mode and located between the limiting cap and the driving ring. A blocking head matched with the limiting cap in an abutting mode is arranged at one end of the rivet sleeve, and the other end of the rivet sleeve and the driving ring are matched circumferentially in a positioned mode. In riveting, the rivet rod rotatesrelative to the rivet sleeve, the driving ring and the limiting cap apply force to the rivet sleeve oppositely to enable the rivet sleeve to be deformed, and after riveting, a deformed part of the rivet sleeve and the blocking head abut against the two sides of a riveting part. The thread core-pulling rivet has high pre-tightening force, tensile strength and fatigue strength after being mounted and is easy to assemble, so that the manufacturing difficulty and cost are reduced.

The invention relates to a ball pin assembly, which comprises a ball cup, a ball bowl, a ball pin and a dustproof cover, wherein the ball bowl is positioned inside the ball cup; the ball pin is provided with a ball part and a pin rod part, wherein the ball pin is positioned in the ball bowl inside the ball cup; and the dustproof cover covers an opening of the ball cup, and the pin rod part extends out of the dustproof cover, wherein the inner surface of the ball cup is provided with holes, and elastic devices are respectively arranged in the holes and used for extruding the ball bowl to the ball part. According to the ball pin assembly disclosed by the invention, the service life of the ball pin can be prolonged, and phenomena, such as looseness, abnormal sound, non-constant sway moment between the ball and the ball bowl are eliminated.

The invention relates to a test system for determining a fastening construction scheme. The system comprises two flanges, a to-be-tested fastener, a fastening tool and a pressure sensor; a detection head of the pressure sensor is arranged between the two flanges; and a bolt in the to-be-tested fastener runs through the holes of the flanges and a hole of the pressure sensor. The system further comprises a fixed counter-force arm gasket and a fixed counter-force arm sleeve; the fixed counter-force arm gasket is arranged on the bolt in a sleeving mode and is located below a nut on one side; and the upper side of the fixed counter-force arm sleeve is connected with one end of the fastening tool. According to the test system disclosed by the invention, by simulating a construction site, a pre-tightening force of the bolt with a load can be accurately measured, and a working state of the fastening tool can be accurately recorded; and the fastening operation is performed on the basis of the measured pre-tightening force and working state of the fastening tool during construction, so that the pre-tightening force, meeting the construction requirement, of the fastener can be guaranteed, andthe leakage of equipment due to unfirm connection and sealing failure caused by a deviation of the pre-tightening force is prevented.

The invention relates to a speed reduction mechanism, in particular to a helical tooth planet gear speed reduction mechanism. The helical tooth planet gear speed reduction mechanism comprises a hub reduction gear shell, a tooth ring, a planet gear support, planet gears, planet gear axles and a sun gear. The planet gears and the sun gear are all helical gears. The sun gear is installed on a half axle. The sun gear is engage with the planet gears. The planet gears are arranged on the planet gear axles in a sleeving manner. The planet gear axles are installed between the hub reduction gear shell and the planet gear support. The planet gears are also engaged with the tooth ring, the tooth ring is connected with a tooth ring support, and the tooth ring support is connected and fastened to an axle pipe. Thrust bearings are attached to the two ends of the sun gear and the two ends of the planet gears respectively, and the thrust bearings are installed on the hub reduction gear shell and the planet gear support respectively. Belleville springs are arranged on the other sides of the thrust bearings. The helical tooth planet gear speed reduction mechanism has the characteristics of being low in noise and large in torque, and the needs for comfort and durability of low floor passenger cars can be met; and meanwhile the problem that the rate of faults such as gear colliding and heating is high can be solved, and the helical tooth planet gear speed reduction mechanism is simple in structure, small in occupied space and easy to use and popularize.

The invention belongs to the technical field of aircraft brake system design, and relates to a pressure regulator of an aircraft hydraulic brake system. The pressure regulator comprises a shell (1), abush A (2), a pressure reducing and flow splitting valve (3), a spring B (16), a first sleeve (17), a fixing seat (20), a spring assembly, a piston assembly, a flow splitting control valve (32), a guide sleeve B (44), a piston rod (43) and a second sleeve (38). According to the pressure regulator, the control pressure comes from the outlet pressure, a main valve core is of an open type, a main valve is operated through the oil inlet pressure, the outlet pressure is introduced into a lower cavity of the main valve and then enters an upper cavity of the main valve through damping holes in the main valve core, the liquid discharging pressure of the main valve core and the operating force of an upper piston are balanced by the spring force, the operating force is applied to a pilot valve, oilliquid in an oil inlet enters an upper cavity of a piston of the main valve core and changes the pressure of the upper cavity of the piston of the main valve core, so that the outlet pressure is adjusted.

The invention relates to a three-way frictional damping force adjustable vibration isolator for a ship, which comprises a base, an upper cover, a vibration isolation spring component and a damping buffer component, wherein the damping buffer component comprises a friction ring, friction pieces and a support plate; a cylindrical bulge is arranged at the middle part of the support plate; the friction pieces are axially and fixedly arranged on the cylindrical bulge in a sleeving manner; and outer ring faces of the friction pieces are contacted with the internal surface of the friction ring. The vibration isolator has the advantages of higher abrasion resistance, higher corrosion resistance and the like, and solves the problems that the available rubber vibration isolator is easy to age and the metal vibration isolator is easy to abrade. In addition, the three-way frictional damping force adjustable vibration isolator for the ship has higher spacial three-way vibration isolation buffer and shock resistances, and the adjustment of a three-way frictional damping force is very convenient.

The invention discloses a connection method and structure for an inner battery box and an outer battery box. In the invention, the inner battery box (1) is connected with the outer battery box (2) in a drawer manner; an elastic limited seat generates pre-pressure to the inner battery box (1) between the front end of the inner battery box (1) and the outer battery box (2); and a bolt (4) on the inner battery box (1) is connected with a keyhole (5) in the outer battery box (2) in an inserting manner, so as to ensure no displacement of the relative positions of the inner battery box (1) and the outer battery box (2). The connection method and structure can improve the connection reliability between the inner battery box and the outer battery box, and avoid sudden breakaway and electric discharge to result in connector burning to affect the normal operation of a vehicle due to relative movement and friction between the inner battery box and the outer battery box.

The invention relates to a page display method and apparatus, an electronic device and a storage medium, relates to the field of computers, and is used for solving the problem of low page loading efficiency at present. The method comprises the steps that after an access request for a hypertext markup language page is received, a cascading style sheet file of the hypertext markup language page is collected from a content distribution network; obtaining a resource file of each static resource from a content distribution network according to the address information of each static resource in thestatic resource set corresponding to the hypertext markup language page; according to the address information corresponding to each resource file, selecting the resource file which is the same as theaddress information of the static resources needing to be displayed in the cascading style sheet file; and displaying the hypertext markup language page based on the resource file of the static resource to be displayed and the cascading style sheet file. Due to the fact that the static resources are preloaded, the static resources in the page are directly obtained from the local cache when being displayed, and the page display efficiency can be effectively improved.

The invention provides a connecting device for a rear shock absorber of an automobile, and belongs to the technical field of machinery. The connecting device solves the technical problems that the conventional connecting device for the rear shock absorber is easy to generate noise, the threaded connection is easy to cause loosening and falling off and the like. The connecting device for the rear shock absorber of the automobile is arranged on a connecting part of the rear shock absorber and a wall body of the automobile body, and comprises a bolt of which one end is fixedly connected with a shell of the rear shock absorber and the other end passes through the automobile body and extends to the upper part of the wall body of the automobile body; a part of the bolt positioned on the upper part of the wall body of the automobile body is orderly sleeved with an elastic upper support, an upper pressure plate and a nut; a part of the bolt positioned between the wall body of the automobile body and the shell of the rear shock absorber is sleeved with an elastic lower support; and a positioning structure ensuring rigid connection of the nut with the pressure plate is arranged between the bolt and the upper and lower supports. The device improves the connecting safety, and cannot generate noise when the automobile runs.

Proposed is a linear guide device (1) which has a support body (6) and at least one guide rail (7) fastened to the support body (6) by being pressed in. The guide rail (7) has a fastening portion (37) which is pressed into a fastening groove (35) of the support body (6). The fastening groove (35) is delimited by a first groove flank (35a) which is formed by a rigid counterbearing portion (28) of the support body (6). Furthermore, the fastening groove (35) is delimited by a second groove flank (35b) which is formed on a clamping leg (32) which is arranged so as to be bendable in the manner of a bending beam with respect to the support body (6). During the pressing of the fastening portion (37) into the fastening groove (35), the clamping leg (32) is bent in a resiliently elastic manner and thereby builds up a clamping force which fixedly holds the fastening portion (37).

The invention discloses a drawn wire pre-tightening device and a robot. The drawn wire pre-tightening device comprises a first reel, a second reel and an end cover, wherein the first reel is used for winding a first drawn wire; the second reel is used for winding a second drawn wire; the first reel is connected with the second reel; the first reel can rotate relative to the second reel; the end cover is fixedly connected with the second reel so as to limit relative movement of the first reel and the second reel; the drawn wire pre-tightening device is used for adjusting the cooperation angle between the first reel and the second by enabling the first reel to rotate relative to the second reel, and thus the pre-tightening force of the first drawn wire and the second drawn wire can be adjusted. According to the drawn wire pre-tightening device of the mode, the pre-tightening force of two drawn wires is adjusted by enabling two reels to rotate relative to each other, so that the pre-tightening force of the two drawn wires in operation can be ensured, and moreover, the drawn wire pre-tightening device occupies a relatively small space. The robot comprises the drawn wire pre-tightening device.

The invention discloses a method for assembling lining plates of a multi-cylinder cone crusher. Moving cone lining plate installation comprises the steps that parts and tools are prepared; a movable cone lining plate falls onto a movable cone; a cutting ring is placed at the top of the movable cone; a locking bolt penetrates through the cutting ring and is screwed on the movable cone; the movablecone lining plate is centered on the movable cone and is in place; the movable cone lining plate is heated; a locking bolt is tightened; the cutting ring is welded; and epoxy resin is filled. Fixed cone lining plate installation comprises the steps that parts and tools are prepared; a fixed cone is placed on a fixed cone lining plate, so that the fixed cone lining plate and the fixed cone are centered and placed in place; a square head bolt, a spherical nut and a wedge block are installed; the spherical nut is screwed down, so that the wedge block correctly pushes against the fixed cone liningplate; whether the matching surface of the fixed cone lining plate and the fixed cone is tightly attached or not is checked; epoxy resin is filled; and a stop block and a nut lock are arranged to limit the rotation of the square head bolt and the spherical nut. According to the method, the correct, firm and reliable installation of the lining plates can be ensured; and the mounting time of the lining plates of the multi-cylinder cone crusher is saved, so that the replacement efficiency of the lining plates of the crusher is improved.

The invention relates to a chopstick grinding device. The chopstick grinding device comprises a rack, a conveying assembly arranged on the rack, and one or more grinding assemblies arranged above the conveying surface of the conveying assembly and arranged in the conveying direction. The invention aims at providing the chopstick grinding device which can automatically conduct grinding on chopsticks and has the advantages that 1, grinding treatment can be automatically conducted on the chopsticks, the grinding efficiency is high, and ground chopstick embryos are consistent in size; 2, pressing positioning can be effectively conducted on the chopsticks through chopstick pressing assemblies, and smooth grinding is ensured; and in addition, the chopstick pressing assemblies are arranged at intervals, thus, the effect that pressing fixing is conducted on each chopstick through one grinding assembly and at least one chopstick pressing assembly in the grinding process can be effectively ensured, and the chopsticks are prevented from being tilted; and 3, the height of chopstick pressing rollers and the pretightening force of springs are conveniently adjusted through the structure of the chopstick pressing assemblies, so that the pressing force on the chopsticks on the lower side is ensured.