2611 results about "Locknut" patented technology

An improved AR platform firearm includes modular brass deflectors and brass catches; sleeved takedown and pivot pinholes; a cam latch device for a secure upper / lower receiver connection; a two-piece upper receiver; a taper-fit barrel system; a barrel alignment system using a barrel alignment washer; a charging handle that positively engages with the bolt carrier; a charging handle retention system using a spring detent; a bolt carrier with rear wall to absorb shear force on the gas key or anvil; a leak-proof gas system using a straight gas tube, ferrule and threaded connection with the gas block; a gas block stop notch that mates with a gas block key; a gas block jam nut for holding the gas block in place; an interchangeable gas system; an expansion chamber; a handguard with adjustable weights; a handguard lock-up mechanism; a handguard extender; and a sloped Picatinny rail for extending scope utilization.

The invention relates to a drive bolt lock (2) for locking and unlocking a fixed leaf (14) of a double-leaf door (11), having a lock housing (21) in which a retractable slide (241) for a drive bolt rod (24) and a bolt slide (5) are accommodated, and a slide plate (27) is mounted so as to be linearly displaceable and a lock nut (23) with a nut lever (231) is mounted so as to be rotatable in order to manually unlock the drive bolt lock (2). In order to enable a broad applicability of the espagnolette lock (2), it is provided that the lock housing (21) has at least two installation spaces (81, 82, 83, 84, 85), wherein a motor module for motor-driven unlocking of the espagnolette lock can be installed or retrofitted in a first installation space (81), and a latch slide module (4) can be installed or retrofitted in a second installation space (82).

The invention discloses a double-acting integrated hydraulic nut and a hydraulic nut system. The double-acting integrated hydraulic nut comprises a cylinder body, a piston, a cylinder cover, a locking nut, an outer hexagon head bolt and a locking sleeve. A mounting plane attached to a workpiece is arranged at the bottom of the cylinder body, and the piston is arranged in an inner cavity of the cylinder body in an axial sliding mode. The outer hexagonal head bolt sequentially penetrates through the axial through hole of the piston and the bottom of the cylinder body, and the threaded end of the outer hexagonal head bolt is meshed with a workpiece in a threaded mode. The cylinder cover is arranged at the top of the cylinder body; the locking nut is in threaded connection with the piston rod and is in contact with the top surface of the cylinder cover; a pressurizing oil port connected with a hydraulic pump station is formed in the side wall of the cylinder body. The hexagonal head of the outer hexagonal head bolt is sleeved with the locking sleeve which is in driving connection with the electric wrench. Due to the fact that the bearing seat bolts are compact in layout and large in bolt pre-tightening force requirement, the experiment platform can be rapidly mounted and dismounted, and working time and cost are greatly reduced.

A locking-mode-selectable lock bolt and nut device comprises a bolt and a nut, the main fastening nut is arranged on the bolt in a sleeving manner; the fixed locknut is arranged on the bolt in a sleeving manner and is positioned above the main fastening nut; wherein a bolt locking groove is formed in the outer wall of one side of the bolt in the length direction, the section of the bolt locking groove is triangular, an acute angle is formed by two side faces in the bolt locking groove, one side face is arranged in the radial direction of the bolt, and the other side face is an inclined face; mounting through holes are symmetrically formed in two opposite surfaces of the fixed locknut, and a screw hole, a round hole and a square hole are sequentially formed in each mounting through hole from outside to inside; the inner diameter of the round hole is larger than that of the screw hole, and the width of the square hole is smaller than that of the round hole. And the two locking assemblies are respectively inserted into the two mounting through holes of the fixed locknut.

The anti-falling overspeed protection device comprises the cargo carrying table and a guide seat, safety tongs are arranged on the cargo carrying table, the safety tongs are connected with a safety tongs connecting plate, and the safety tongs connecting plate is fixedly connected with a connecting rod and an overspeed connecting rod; the overspeed connecting rod is fixedly connected with the middle of the safety gear connecting plate, one end of the overspeed connecting rod is hinged to the cargo carrying table mounting plate, and the other end of the overspeed connecting rod is fixed to the overspeed protection steel wire rope. The upper end of the compression rod penetrates through the supporting spring and is fixed at the lower end of the guide seat through a locking nut; a guide rod is further fixed to the lower end of the guide seat through a nut, the guide rod penetrates through the spring support and the compression spring, a pulley shaft penetrates through the upper end of the guide seat, and the pulley shaft further penetrates through the pulley and the pulley bearing and is fixed to the pulley mounting plate through an end cover. The safety protection device is used for safety protection when rope breaking, rope loosening or stalling and overspeed happen to the cargo carrying table of the stacking machine.

The invention relates to the technical field of hydraulic valves, and discloses a buffer overflow valve which comprises a shell, a first sealing ring is arranged on the surface of the shell, a connecting block is fixedly connected to the right end of the shell, an adjusting assembly is arranged in the connecting block, and a storage assembly is fixedly connected to the side, close to the shell, of the adjusting assembly. A moving assembly is arranged in the storage assembly, a spring is arranged between the storage assembly and the moving assembly, the adjusting assembly comprises a threaded rod, the surface of the threaded rod is in threaded connection with a connecting block, and the surface of the threaded rod is in threaded connection with a locking nut. A closed cavity is formed between a connecting column and a fixing seat, a second sealing ring is used for sealing, a valve element and an oil way in the connecting column are communicated with the closed cavity, the cavity is filled with oil, and when the oil on the left side of the valve element rises, due to the existence of the oil in the closed cavity, the valve element cannot instantly leave a valve seat at the bottom of a valve block; therefore, the buffer overflow valve can be opened at low pressure, and pressure impact cannot be generated.

The utility model discloses a drawing instrument capable of monitoring the displacement amount of an anchor rod in real time, which comprises a counter-force gasket, a sleeve, a tension oil cylinder, a steel wire type spring displacement meter and a connecting rod, the counter-force gasket, the sleeve and the tension oil cylinder are sequentially arranged in a contact mode, one end of the connecting rod penetrates through the tension oil cylinder and the sleeve and then is in threaded connection with the exposed end of the anchor rod, and the other end of the connecting rod is in threaded connection with the steel wire type spring displacement meter. The other end penetrates through the tension oil cylinder and then is in threaded connection with a locking nut; the steel wire type spring displacement meter is arranged on the counter-force gasket and the tension oil cylinder and is fixed through elastic force of the steel wire type spring displacement meter. The drawing instrument provided by the utility model can measure and record the displacement of the anchor rod in real time in the drawing process of the anchor rod, simultaneously generates an anchor rod displacement-time whole-process curve, observes the displacement change trend of the anchor rod, and can export data in the later period, so that engineers can comprehensively evaluate the performance of the anchor rod.

The utility model discloses an anti-loosening double-nut pressing type quick coupler, and relates to the technical field of sealing couplings. Comprising a connector body, and a continuous fifth threaded section is arranged on the outer wall of the connector body; the locknut set comprises a fastening nut and a locking nut, a fixed section is formed at one end of the fastening nut, a continuous first threaded section matched with the fifth threaded section is arranged on the inner wall of the fastening nut and the inner wall of the fixed section, a second threaded section is arranged on the outer diameter of the fixed section, a locking section is formed at one end of the locking nut, and the locking section is matched with the second threaded section. A third threaded section matched with the second threaded section is arranged on the inner wall of the locking section, and a fourth threaded section matched with the fifth threaded section is arranged on the inner wall of the locking nut; the fastening nut and the locking nut are in threaded connection through the second threaded section and the third threaded section, and the locking nut is in threaded connection with the fifth threaded section on the connector body through the fourth threaded section. The fastening nut and the locking nut are fixed in a detachable connection mode.

The invention discloses a novel permanent magnetic mechanism suitable for a permanent magnetic circuit breaker and a ring main unit, which is characterized in that a static iron core and a movable iron core are oppositely arranged in an aluminum alloy shell along the axial direction, an internal pull rod penetrates through the axis of the aluminum alloy shell, and the internal pull rod movably penetrates through the static iron core and is connected with the movable iron core; a shaft fixing ring is movably arranged on an inner pull rod of the aluminum alloy shell, the shaft fixing ring movably abuts against the side, away from the static iron core, of the movable iron core, and the two sides of the shaft fixing ring are axially limited through a locking nut and a total stroke adjusting nut which are connected to the inner pull rod in a threaded mode. The mechanism is provided with a total stroke adjusting mechanism, an overtravel adjusting mechanism and a switching-on and switching-off speed adjusting mechanism, respective adjustment is achieved through special nuts, the problem of synchronous change of the opening distance and the overtravel of a traditional mechanism is solved, an aluminum alloy shell and a closed magnetic circuit are adopted, magnetic leakage is reduced, the magnetic field utilization rate and the impact resistance are improved, and spring pre-tightening force is changed through spring adjusting nuts; the switch-on and switch-off speed is accurately controlled, various loads are adapted, and the breaking risk is reduced.

The utility model discloses assembling equipment, and relates to the technical field of vehicle production, the assembling equipment comprises a production line, an assembling device, a feeding device, a tightening device and a tightening machine, the production line is sequentially provided with a feeding station, a feeding station and a tightening station along the conveying direction of the production line, the assembling device comprises a bearing mechanism, a tightening mechanism and a first transfer robot; the first transfer robot can transfer the shock absorber from the bearing mechanism to the tightening mechanism, and can also transfer the tightened shock absorber to a brake disc at the feeding station; the feeding device is used for conveying locking nuts to a screw rod, penetrating through a shock absorber, on the brake disc; the tightening device is used for tightening the locking nut and the locking nut for fixing the swing arm; the tightening machine is used for tightening fixing bolts of the fixing support and fixing nuts matched with the fixing bolts. According to the technical scheme, the assembling device, the feeding device, the tightening device and the tightening machine are arranged, so that manual assembly of the brake assembly can be replaced, and the working efficiency is improved.

The invention discloses a hoisting module, a hoisting system and a construction method for crossing-intersection cast-in-place beam construction, the hoisting module comprises a reverse hoisting steel frame, a bottom platform, a plurality of reverse jacking devices and a plurality of hoisting rods, and the reverse hoisting steel frame is supported by two segmental beams; a plurality of first lifting holes are distributed in the reverse lifting steel frame; second lifting holes are formed in the positions, corresponding to the first lifting holes, of the bottom platform. The upper end of each hanging rod penetrates through one first hanging hole, the lower end of each hanging rod penetrates through one second hanging hole, and the upper end and the lower end of each hanging rod are in threaded connection with locking nuts respectively. A reverse jacking device is arranged between each segmental beam and the bottom platform; each reverse jacking device comprises a lower jacking block, an adjusting nut, a lifting screw and an upper jacking plate, and the upper jacking plates and the lower jacking blocks apply pressure to the segmental beams and the bottom platform correspondingly. Through a double stress balance structure of reverse hoisting of the reverse hoisting steel frame and reverse jacking of the reverse jacking device, the construction safety is greatly improved.

This invention discloses a pneumatic rust remover, comprising a gun-shaped body with a trigger and an on / off valve assembly mounted on the handle, and a cylinder. The gun-shaped body has a cylindrical cavity formed in its barrel section. The cylinder is installed in a cylinder sleeve and, together with the cylinder sleeve, piston, valve seat front cover, and valve seat rear cover, forms an impact assembly. A vibration damping and buffering assembly is installed inside the cylindrical cavity of the gun-shaped body. The vibration damping and buffering assembly consists of a connecting sleeve, an impact isolator, and a cylinder buffer pad. The cylinder buffer pad is press-fitted between the bottom of the cylindrical cavity and the rear end face of the connecting sleeve. The impact isolator is press-fitted onto the front annular surface of the connecting sleeve via a locking nut, and the locking nut is screw-fitted to the cavity opening of the cylindrical cavity. The rear end of the cylinder sleeve passes through the locking nut and extends into the sleeve cavity of the connecting sleeve, where it is screw-connected. An air inlet valve assembly is provided inside the sleeve cavity. This invention offers a comfortable grip, high rust removal efficiency, good shock absorption, and is adaptable to rust removal tools with different functions.

The invention discloses a combined piston rod type support oil cylinder which comprises a cylinder barrel, a mounting flange, a first rod body, a locking nut, a second rod body, a guide sleeve, a sleeve, a front gland and a rear gland, wherein the second rod body, the guide sleeve, the sleeve, the front gland and the rear gland are mounted in the cylinder barrel. The first rod body and the second rod body are in threaded connection to form a piston rod, trapezoidal threads are arranged on a rod body of the first rod body, the locking nut is in threaded connection with the first rod body, and the mounting flange is arranged on a barrel body of the cylinder barrel in a sleeving mode. The problem that the whole piston rod is difficult to maintain is solved, and quick replacement of the threaded section is achieved; hydraulic pressure maintaining is replaced by mechanical locking, and the oil leakage risk of the system is eliminated. The structure is particularly suitable for industrial equipment, oil drilling equipment and other high-load scenes needing long-term stable supporting, and the maintainability and reliability are remarkably improved while the bearing capacity is guaranteed.

The high-stability low-voltage wire tightener comprises an upper pressing plate, a middle pressing plate, a lower pressing plate and a shell, two screws are arranged at the bottom of the upper pressing plate, two middle holes and two lower holes are formed in the middle pressing plate and the lower pressing plate respectively, the screws sequentially penetrate through the middle holes and the lower holes, and locking nuts are connected to the screws; the pre-tightening mechanisms are arranged on the two sides of the lower pressing plate and matched with the two screw rods correspondingly, each pre-tightening mechanism comprises a pre-tightening knob, a follow-up block and a pre-tightening shaft sleeve, the pre-tightening shaft sleeves are installed on the peripheries of the screw rods, a plurality of conical teeth are vertically arranged on the side portions of the pre-tightening shaft sleeves, the two sides of the lower pressing plate are each provided with a circular truncated cone part, and movable cavities are formed in the outer ends of the circular truncated cone parts; a guide hole is formed in the inner end of the movable cavity, the pre-tightening knob is connected to the outer end of the circular truncated cone part, the follow-up block is arranged in the movable cavity, the pre-tightening knob is rotated to drive the follow-up block to axially slide, and a locking convex part is arranged on the follow-up block. When the nut is not screwed tightly or unscrewed, the cable cannot slide and fall off, high-altitude operation of a worker is facilitated, and the safety is higher.

A torque control fastener system having a fastener nut, a helical wire insert, and a shaft, where the nut and helical wire insert have unique hardness and coefficient of thermal expansion relationships that produce improved performance.

An adjustable closure bumper includes a base, a stem, a bump stop, a ratchet mechanism, and a locking nut. The base is mountable to a body panel adjacent to an opening for a closure panel. The stem is insertable into a receptacle in the base. The bump stop is attached to one end of the stem for engaging the closure panel. The ratchet mechanism allows the stem to move into the receptacle in the base to adjust a height of the adjustable closure bumper while inhibiting movement of the stem out of the receptacle. The locking nut fits over a portion of the base forming the receptacle and is rotatable relative to the base to lockout the ratchet mechanism and thereby set the height of the adjustable closure bumper.

An assembly tool for a belleville spring assembly is provided with a base, a telescopic boss, a telescopic boss driving device, a positioning stud and a locking nut. The telescopic boss driving device adopts a pneumatic mode and is connected with an external high-pressure air source; the base is a square pedestal, a cavity with an opening in the upper end is formed in the middle of the base and is of a stepped cylindrical hole structure, the diameter of a cavity body of the cavity is smaller than that of the bottom of the cavity, a telescopic boss is assembled in the cavity in a vertically movable mode, and a sealing ring is assembled between the inner wall of the cavity and the telescopic boss. The bottom of the cavity is communicated with the telescopic boss driving device through a gas pipeline; the telescopic boss is of a cylinder structure, and the upper end face of the telescopic boss is a horizontal plane. The positioning studs are fixed to the four corners of the base, and the locking nuts are assembled on the positioning studs. According to the utility model, the assembly quality of the belleville spring assembly is ensured, and the purposes of meeting the use performance requirements of the belleville spring and improving the working efficiency are achieved.

The invention discloses an assembly type adjustable pipeline supporting and hanging frame which comprises an upper U-shaped frame, the upper U-shaped frame comprises two vertical rods, the bottoms of the two vertical rods are connected together through a bottom cross arm, a middle cross arm is arranged in the middles of the two vertical rods, the two vertical rods are connected together through a connecting piece and an L-shaped corner connector, and the vertical rods are of a rectangular pipe structure. An opening groove is formed in the end face of the inner side of the rectangular pipe in the length direction of the rectangular pipe, inclined clamping teeth are arranged on the portion, at the opening groove, of the inner wall of the rectangular pipe, a connecting piece is clamped into the rectangular pipe and comprises a connecting block, inclined sawteeth and a bolt are arranged on the surface of one side of the connecting block, and the inclined clamping teeth and the inclined sawteeth are opposite in inclined direction and meshed together. The bolt extends out of the opening groove, penetrates through an L-shaped corner brace arranged on the outer wall of the vertical rod and is locked and fixed through a locking nut, and the horizontal section of the L-shaped corner brace is fixedly connected with the middle cross arm. The support hanger structure is convenient to adjust, and can be conveniently expanded to add other components.

The utility model discloses a lock bolt structure, and relates to the lock bolt technical field, the lock bolt structure comprises a to-be-fastened piece and a bolt main body, the bolt main body comprises a bolt head, the lower end of the bolt head is provided with a first threaded rod, the outer surface of the first threaded rod is provided with a fastening assembly, the fastening assembly comprises a main body nut and a locking nut, and the main body nut and the locking nut are connected through a connecting rod. The main body nut and the locking thread are both in threaded connection with the outer surface of the first threaded rod, the main body nut is located above the locking nut, the main body nut is in threaded connection with the first threaded rod, and then the locking nut is in threaded connection with the first threaded rod; the first vertical surface at the lower end of the main body nut is in contact with the second vertical surface at the upper end of the locking nut, so that the first vertical surface and the second vertical surface abut against each other at an interval, and when the bolt is vibrated or impacted to move in the loosening direction, the main body nut and the locking nut are blocked by the first fastening piece and the second fastening piece, and the bolt is prevented from being gradually loosened; and accidents are increased.

The utility model belongs to the technical field of nut wrenches, and particularly relates to a precise locking nut wrench which comprises a wrench body, two bearings are fixedly connected to the inner wall of the wrench body, and the same main shaft is welded to the inner sides of inner rings of the two bearings. The wrench body serves as a main body of the whole tool and is flexibly and rotationally connected with the main shaft through the bearing, the limiting sleeve is installed on the main shaft and used for limiting the stroke of the main shaft, the square hole is formed in one end of the wrench body, and the shape and the size of the square hole are designed to be matched with those of a torsion bar on a torsion plate. A user can directly sleeve the torsion bar on the torsion plate into the square hole to realize torque transmission and control of the wrench body, the locking part is a key part of the wrench body and is in direct contact with a locked nut, and when a torsion wrench applies torque, the torque is transmitted to the torsion bar through the torsion plate and then is further transmitted to the locking part of the main shaft, so that the nut is locked. Therefore, locking of the nut is achieved, and efficient and accurate locking operation is achieved.

The hollow injection anchor with self-adjusting rock joints, comprising an anchor rod (1) and a drill bit (5), wherein the drill bit (5) is attached to one end of the anchor rod (1) for drilling holes, characterized in that the anchor rod (1) has a blocking assembly (6) attached to the surface of the anchor rod (1) for blocking the holes; the blocking assembly (6) comprises: a fixing ring (601), wherein the fixing ring (601) is fixedly mounted on the surface of the anchor rod (1); an elastic plate (602), wherein the elastic plate (602) is mounted on the surface of the anchor rod (1) and one end of the elastic plate (602) is fixedly connected to the fixing ring (601); a lock nut (605), wherein the lock nut (605) is provided with a thread on the surface of the anchor rod (1).

The utility model relates to the technical field of bearing detection, in particular to a rolling bearing multi-sensor detection platform which comprises installation blocks, hinges, locking bolts, pressing plates and the like, the installation blocks are arranged in a semicircular shape, and the two installation blocks form an annular installation ring through the hinges. The two mounting blocks are locked through matching of the locking bolts and the locking nuts so as to maintain the state of the mounting ring, during detection, the mounting ring is sleeved on the bearing seat, a main shaft to be detected is mounted in the bearing seat through a rolling bearing, eight mounting grooves are uniformly formed in each mounting block at intervals, and pressing plates are fixedly mounted in four of the mounting grooves which are uniformly arranged at intervals. According to the utility model, the two semicircular mounting blocks are combined to form a circular mounting ring structure, and the mounting grooves and the pressing plates which are uniformly arranged on the mounting blocks at intervals are utilized, so that accurate positioning and equal-interval distribution of the vibration sensor and the lifting frame in the circumferential direction of the bearing seat are ensured.

The utility model provides a quick connector of a fuel gas corrugated pipe, and belongs to the technical field of fuel gas pipelines. The problem that potential safety hazards exist when an existing quick connector is used is solved. The quick connector of the fuel gas corrugated pipe comprises a locking nut, a connector body, a sealing gasket and a clamping piece, the sealing gasket is arranged at the end, facing the locking nut, of the connector body, the inner side of the locking nut is provided with an annular protruding shoulder, the clamping piece is arranged between the sealing gasket and the protruding shoulder, and the inner side of the clamping piece is provided with a clamping part protruding inwards. The quick connector of the fuel gas corrugated pipe further comprises an annular insulating ring made of insulating materials, the insulating ring is arranged on the outer side of the clamping piece in a sleeving mode, the outer side face of the insulating ring can abut against the inner wall of the locking nut, and the end, facing the protruding shoulder, of the insulating ring is provided with an annular blocking edge protruding inwards. And the blocking edge is positioned between the clamping piece and the convex shoulder. The quick connector of the fuel gas corrugated pipe can effectively avoid potential safety hazards.

Device for separating a second part from a first part, including a first interface intended to be fixed to the first part and a second interface intended to be fixed to the second part, a docking stud passing through the first and second interfaces and being held at the first interface by a separation nut and at the second interface by a first nut / locknut assembly, the docking stud being covered by a cap secured to the second interface and intended to receive it once the separation nut has broken and the first and second interfaces have been separated, and a retraction spring is provided to extract the docking stud from the first interface, propel it towards a damping material fixed at the bottom of the cap and hold it there by its residual holding force alone.

The air spring strut assembly comprises a shock absorber, a plane bearing, an upper antifriction ring, a lower antifriction ring, an air seal and a locking nut, the plane bearing is arranged between the top face of a cylinder body of the shock absorber and a fluctuating piston on the air spring, the upper antifriction ring is arranged between the side face of the top of the cylinder body of the shock absorber and the fluctuating piston on the air spring, and the lower antifriction ring is arranged between the side face of the top of the cylinder body of the shock absorber and the fluctuating piston on the air spring. A lower antifriction ring is arranged between the bottom of a fluctuating piston on the air spring and the side face of the cylinder body, and an air seal is arranged between a piston rod of the shock absorber and the fluctuating piston on the air spring and locked through a locking nut. The invention has the advantages that under the action of the plane bearing, the upper antifriction ring and the lower antifriction ring, the cylinder body of the shock absorber can rotate on the fluctuating piston and compensate the torsion, so that the torsion applied to the fluctuating piston by the cylinder body is greatly reduced, the torsion to the bag skin is reduced, the impact abnormal sound of the bag skin is reduced, and the service life of the bag skin is prolonged. And abnormal stress of the leather bag can be reduced, and the service life of the air spring is prolonged.

The invention discloses an expansion pin assembly for a split reamer bit, the split reamer bit and an assembling method. The expansion pin assembly for the split type reamer bit comprises an expansion pin shaft sleeve, an expansion pin bolt and an expansion pin nut. An expansion head is arranged at one end of the expansion pin shaft sleeve, a first circular truncated cone through hole is formed in the expansion head, and the hole wall surface of the first circular truncated cone through hole is a first circular truncated cone surface; a locking head is arranged at one end of the expansion pin bolt, and the outer surface of the locking head is a second circular truncated cone face matched with the first circular truncated cone face. And when the expansion pin bolt is completely inserted into the expansion pin shaft sleeve, the second circular truncated cone surface is tightly attached to the first circular truncated cone surface. According to the expansion pin assembly, through the self-locking effect between the first circular truncated cone face and the second circular truncated cone face, the loosening phenomenon in the construction process can be effectively prevented, mechanical self-locking is achieved, an anti-loosening device such as a locking nut or a cotter pin does not need to be additionally arranged, and the connection reliability is greatly improved.

The invention relates to the technical field of mechanical fatigue testing, in particular to rotary bending fatigue testing equipment for a rotor shaft, which comprises a base, a rotary driving module, a loading module, a dynamic balance module, a crack monitoring module and an adjusting module, and is characterized in that the rotary driving module drives the rotor shaft to rotate through a belt transmission assembly; the loading module adopts a lever type force reversing mechanism to realize accurate bending moment loading; the dynamic balance module automatically counteracts eccentric vibration through a free disc and a symmetrical bearing seat; the crack monitoring module captures vibration abnormity and internal crack initiation in real time; and the adjusting module is automatically adapted to different shaft lengths by driving a threaded screw rod through a motor. Anti-slip lines are arranged on the inner sides of the clamps at the two ends to ensure stable clamping; the levers are symmetrically arranged and matched with the locking nuts, so that switching of translation force or bending force applied by the levers is facilitated, the equipment realizes high-precision and full-period fatigue test, and the device is suitable for reliability evaluation of key rotor parts of aero-engines and steam turbines.

The utility model discloses a locknut assembly which comprises a nut body, a locknut is further arranged on the nut body in a matched mode, a locknut containing cavity is formed in the nut body, the locknut is completely or partially contained in the locknut containing cavity, a frustum part is arranged on the locknut, and the frustum part is provided with a conical surface. The outer side wall of the frustum part is used for being correspondingly matched with the inner cavity wall of the anti-loosening containing cavity, at least one expansion joint is formed in the anti-loosening nut, and the expansion joint is a gap penetrating up and down. By utilizing a double-nut structure, particularly combining with the design of the locknut, and utilizing the acting force of the expansion joint and the inclined plane, the overall contraction and clasping are realized, and the anti-loosening performance is improved.