1790 results about "Locknut" patented technology

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 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 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.

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 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 belongs to the field of cylindrical grinding and tensioning mandrel devices, and particularly relates to a cylindrical grinding and tensioning mandrel device which comprises a grinding mandrel body, a movable groove is formed in the grinding mandrel body, and a loosening and tensioning positioning shaft is connected into the movable groove in a sliding mode. When a nut workpiece body is clamped, the nut workpiece body is arranged outside the core grinding shaft body in a sleeving mode, then the locking nut is rotated, the loosening and expanding positioning shaft cannot rotate through threaded fit between the locking nut and the loosening and expanding positioning shaft, and the locking nut cannot move horizontally, so that the loosening and expanding positioning shaft can be driven to move horizontally; in this way, the movable steel ball is matched with the inclined face of the loose positioning shaft, the movable steel ball can move in the radial direction, the inner hole of the nut workpiece body is opened, the effect of locking the nut workpiece body is achieved, meanwhile, the clamping and dismantling time is shortened, the concentricity of the inner hole and the outer circle of the nut workpiece body can be accurately guaranteed, and the machining precision of products is controlled. And the clamping efficiency is improved.

The invention discloses a vacuum circuit breaker assembly positioning device with an automatic nut locking function, and particularly relates to the field of vacuum circuit breaker assembly.The vacuum circuit breaker assembly positioning device comprises two positioning boxes, positioning seats are fixedly arranged on the sides, close to each other, of the two positioning boxes, and a supporting plate is arranged between the two positioning seats; mounting holes are formed in the two positioning seats, locking nuts are fixedly arranged at the positions, located at the mounting holes, of the bottom ends of the positioning seats, locking screws are arranged at the locking nuts, limiting rods are fixedly arranged at the upper ends of the locking screws, and limiting caps are fixedly arranged at the ends, away from the locking screws, of the limiting rods. The locking screw rod can be matched with the locking nut when rotating, so that the locking screw rod is screwed into the locking nut until the limiting cap tightly abuts against mounting pieces on the two sides of the vacuum circuit breaker, mounting and fixing of the vacuum circuit breaker are achieved, operation is simpler, and the problem that mounting is not easy due to narrow space can be solved.

The utility model relates to the field of hydraulic tensile shearing test fixture, disclose a V type notch hydraulic tensile shearing fixture, including upper clamping concrete, sample and lower clamping concrete, the upper clamping concrete and lower clamping concrete upside down both ends are fixed with the handle at the edge, the upper clamping concrete and lower clamping concrete opposite side fixedly set up with the jack, the lower clamping concrete front end fixedly set up with the centring block, the upper clamping concrete front end fixedly set up with the upper joint, the lower clamping concrete rear end fixedly set up with the lower joint, the upper joint and lower joint outside all are threadedly equipped with lock nuts. In the utility model, through optimization design and stable clamping system, the fixture significantly reduces the skidding phenomenon in the test, ensures the accuracy of test result, effectively improves the consistency of test result, simultaneously, the simple operation design of fixture not only shortens the preparation time, but also improves the test efficiency, reduces the working strength of operating personnel.

The utility model relates to the technical field of manufacturing of petroleum drilling and production equipment, and discloses a locking device for a petroleum drilling machine, which comprises a first locking seat, a first positioning pin, a locking pin, a locking nut, a second positioning pin and a second locking seat, the first locking seat is matched with the second locking seat, a spring mounting groove is arranged in the first locking seat, a spring is arranged in the spring mounting groove, and the locking pin is arranged in the locking nut. The spring is sleeved outside the lock pin; a mounting hole is formed in the contact surface of the first locking seat and the second locking seat, a second positioning pin is arranged in the mounting hole, one end of the second positioning pin is fixed in the hole in the second locking seat, and the other end of the second positioning pin is clamped with the hole in the first locking seat. By arranging a reasonable locking structure and an elastic buffering mechanism, the reliability and durability of the locking device are remarkably improved, the operation process is simplified, the maintenance cost is reduced, meanwhile, safety accidents caused by locking failure are effectively reduced, the operation efficiency and safety of the drilling machine are further improved, and the locking device is suitable for various complex working conditions.

The utility model discloses a kind of multiple pipelines joint fixing device, including supporting plate, support and fixed mechanism, supporting plate is by the length same inner supporting plate and outer supporting plate long side alignment splicing composition, inner supporting plate and outer supporting plate are respectively symmetrical with multiple semicircular holes in its contact surface, support includes the supporting arm of spacing matching supporting plate length, the outside end of two side supporting arms is respectively connected with the both ends of a connecting arm, the length direction both sides of inner supporting plate and outer supporting plate are provided with supporting plate fixed hole along supporting plate width direction, the both sides of connecting arm are provided with the through support fixed hole corresponding supporting plate fixed hole, fixed mechanism includes fixed bolt and locknut, fixed bolt passes through support fixed hole, the supporting plate fixed hole of inner supporting plate and outer supporting plate, end head installs locknut and tightens fixed inner supporting plate and outer supporting plate and the multiple pipelines needing to be fixed.The utility model solves the problem that traditional wood supporting plate is easy to deviate and fall off, and the device is easy and efficient to operate, suitable for multiple pipeline installation scene.

A quick disconnect system. The quick disconnect system may include a head, a base, and a seal positioned between the head and the base. The head may include a receptacle and a channel having a locking portion. The base may include a sealing portion sized to be positioned within the receptacle of the head, a pin extending radially from the sealing portion of the base, and a locking nut. The pin may be sized to be positioned within the channel of the head such that relative rotation of the head and the base positions the pin within the locking portion. The locking nut may be positioned on a threaded portion of the base such that, when the pin is positioned within the locking portion of the channel, tightening the locking nut compresses the pin against a wall of the channel to prevent separation of the base and the head.

The utility model relates to the technical field of semitrailer tire burst safety protection, and discloses a semitrailer tire burst emergency locking safety protection device which comprises a hub body and a spoke, a first supporting ring is arranged on the upper portion of the center of the outer side of the hub body, and a second supporting ring is arranged on the lower portion of the center of the outer side of the hub body. A connecting adjusting device is arranged at the other end of the first supporting ring and comprises two square grooves, arc-shaped screw rods are arranged between one end of the first supporting ring and one end of the second supporting ring and close to the front portion and the rear portion, and the two ends of the two arc-shaped screw rods penetrate through the two square grooves correspondingly to the inner walls of the two square grooves; and the outer sides of the two end parts of the two arc-shaped screw rods are in threaded connection with locking nuts in a sleeving manner. According to the hub main body adjusting device, a worker can adjust the locking nut to adjust and adapt to the hub main body according to different sizes of the hub main body through the connecting adjusting device, so that the universality and the adaptability of the device are improved.

The utility model relates to encoder test board technical field, concretely is encoder test board, the utility model discloses, including the casing, the surface of casing installs support frame, the surface of support frame installs encoder mounting seat, the surface of encoder mounting seat installs first encoder, the surface of casing installs code wheel mounting seat, the surface of code wheel mounting seat installs encoding wheel, installs the bearing in the casing, installs the axle in the casing, the surface of axle installs lock nut, the surface fixedly connected with two fixed plates of encoder mounting seat, one side fixedly connected with two springs of fixed plate. Solveed staff when installing first encoder, cannot accurate first encoder place to the central of encoder mounting seat, lead to staff when installing first encoder to need to spend long time to cause staff installation efficiency lower problem.

The application discloses a device and method for simulating the quick strain failure behavior of a nuclear fuel cladding, which comprises a support structure composed of a rack moving base and a hoisting device, a load loading system composed of a fixing frame, a powerful electromagnet, a limiting device, a counterweight and a guide column, and a test and measurement system composed of a punch, a plunger, a guide sleeve, a piston cylinder, a cylinder body, a hydraulic oil chamber, a pressure sensor, a driving pipe mounting flange, a locking nut, a driving pipe, a cladding pipe and a data acquisition device; the application provides a test method matched with the device; the application can realize the simulation of the quick strain failure behavior of the nuclear fuel cladding under the plane strain stress condition in the millisecond scale, can accurately record the internal pressure and strain response relationship of the cladding under the quick strain condition, and thus realizes the evaluation of the quick strain failure performance of the cladding.

The utility model discloses a kind of packing machines, belong to packing machine technical field, including fusion assembly and drive unit, drive unit drives fusion assembly work, fusion assembly includes compression unit, compression unit includes compression seat, support shaft, locking nut and limit block, support shaft is fixedly installed in compression seat, locking nut is installed in the threaded end of support shaft, support shaft is fixed in compression seat, limit block is set in the upper end of compression seat, limit locking nut rotation. Tensioning assembly's tensioning wheel and end cover are exposed outside shell, fusion assembly's fusion upper tooth and cutter unit are exposed outside shell, it is convenient to clean, maintain and adjust. A kind of packing machine of the utility model can conveniently and quickly adjust compression force to be suitable for different thicknesses of packing belt, and it is convenient to clean and maintain inside structure of packing machine.

The utility model discloses an anti -pulling expansion bolt, including expansion sleeve, the bolt body of having expansion head in one end, the bolt body of having the stud portion in the other end is worn in expansion sleeve, and the stud portion is connected with the lock nut on the screw thread, and the expansion sleeve is surrounded with a plurality of lateral mouth extending along the axial direction, and the U type elastic sheet is buried in the lateral mouth, and the U type elastic sheet includes the first elastic sheet partial body of arranging outward, the second elastic sheet partial body of arranging inward, the first elastic sheet partial body is connected with the expansion sleeve to the one end of facing expansion head, and the other end is connected with the second elastic sheet partial body, and the second elastic sheet partial body stretches out the inside of lateral mouth, and the first elastic sheet partial body under the natural state does not stretch out the outside of lateral mouth, and the extrusion ring is equipped on the bolt body, and the extrusion ring is equipped between the lateral mouth and expansion head. When the expansion bolt is in the expansion state at the sleeve head part, will make the extrusion ring extrude the U type elastic sheet outward, causes its to stretch out the aperture and press into the bolt hole hole wall of reserving, thereby strengthens the anti -pulling capacity.

The preload adjustable shock absorber comprises a mounting support, a compression spring, a stud and a locking nut assembly, a connecting piece and a movable sleeve rod are arranged on the two sides of the mounting support respectively, the stud is arranged in the movable sleeve rod in a penetrating mode, and the mounting support, the connecting piece and the stud are coaxially arranged; the connecting piece and the movable sleeve rod are connected into a whole on the two sides of the installation support through studs. The locking nut assembly comprises a nut body, the nut body is arranged at the other end of the double-end bolt in a sleeving mode, the compression spring is arranged on the double-end bolt in a sleeving mode and located between the movable sleeve rod and the nut body, the two ends of the double-end bolt abut against the movable sleeve rod and the nut body respectively, and the pre-compression amount of the compression spring can be adjusted by rotating the nut body. The pre-compression amount of the compression spring can be adjusted by rotating the nut body to meet the requirements of different users; the locking nut axially limits the nut body and cooperates with the friction bottom sheet to enhance the stability, the situation that the pre-compression amount is changed due to nut looseness is prevented, and the damping effect is stable.

The utility model discloses a hoop for producing three continuous casting parts, which comprises a shell, the shell is divided into an upper shell and a lower shell, and the upper shell and the lower shell are connected through a locking device; the locking device comprises locking pieces fixedly installed at the ends, close to each other, of the left side and the right side of the upper shell body and the lower shell body, locking nuts are fixedly arranged in the four locking pieces, every two locking nuts located on the same side are in threaded connection through an adjusting bolt, and the upper shell body and the lower shell body jointly form a circular ring in a surrounding mode. And the upper shell and the lower shell are made of high-temperature-resistant alloy steel. The utility model relates to the technical field of continuous casting three-major-piece production accessories. According to the hoop for production of the three continuous casting major parts, the number of rotation turns of the locking nuts on the two sides is judged to be the same by observing the position relation between the depth gauge on the side wall of the adjusting bolt and the locking nuts, so that it is guaranteed that the locking strokes at the two ends are the same, and the phenomenon that a rubber sleeve and a core rod are not concentric is effectively prevented.

The utility model discloses a wind power main shaft bearing hoisting device, which relates to the technical field of large bearing hoisting and comprises a supporting block, a threaded hole is arranged on the supporting block, a stud pin and a supporting stud are connected with the supporting block through the threaded hole, and a long round hole and a threaded hole are arranged on a pressing block. The pressing block is arranged in the middle of the supporting stud and then fixed through the upper and lower large-cap locking nuts, the clamping bolt is connected with the pressing block and then arranged between the two rollers on the upper row of the bearing, the rotating hanging ring is arranged at the upper end of the supporting stud, and the height of the rotating hanging ring is adjusted through the adjusting nut. The wind power main shaft bearing hoisting device provided by the utility model is simple in structure and convenient to mount, the main shaft bearing heating and tool mounting time is shortened, the overall hoisting efficiency is improved, the hoisting process is stable and controllable, and the hoisting safety is improved.

The utility model relates to a nursing ankle appliance for preventing foot drop, which belongs to the technical field of nursing appliances and comprises a bottom plate, the top of the bottom plate is provided with a limiting mechanism and a damping mechanism, the top of the limiting mechanism is provided with a mounting mechanism, and the mounting mechanism comprises a limiting plate. And the limiting mechanism comprises a mounting cylinder, a locking nut and a threaded rod. The leg angle adjusting device has the advantages that by arranging the limiting mechanism, when the angle of the device needs to be adjusted in use, the limiting plate can be rotated by adjusting the length of the threaded rod, then the angle of the device is adjusted, people can adjust the angle and position of the legs conveniently, and the leg angle adjusting device is fixed through the locking nut and is convenient to use. The device is simple in structure and convenient to use, fixing adjustment of the device is facilitated, leg training and movement are facilitated, convenience is achieved, meanwhile, the damping mechanism is adopted, impact and vibration are effectively absorbed, the influence of disturbance of environments and objects on the device is reduced, and therefore the device can be stably and stably used.

This utility model relates to the technical field of food mixing blade components, and more particularly to a stainless steel mixing blade component with good stability. It includes a blade holder, a blade shaft, and a locking nut. The blade shaft is fitted with a vibration-damping and noise-reducing rubber ring. The blade shaft has multiple nanopores forming a nanopore surface. The vibration-damping and noise-reducing rubber ring is integrally injection molded and tightly bonded to the nanopore surface of the blade shaft to form an integrated structure. From top to bottom, an upper-layer mixing blade, a middle-layer mixing blade, and a lower-layer mixing blade are sequentially fitted onto the outer side of the vibration-damping and noise-reducing rubber ring. The locking nut locks the upper-layer, middle-layer, and lower-layer mixing blades downwards. This utility model not only avoids radial movement of the stainless steel mixing blade and hard contact with the blade shaft, but also ensures more uniform overall force distribution, greatly improving overall stability and reducing noise, making it more suitable for various food mixers.

The utility model discloses a heat exchange tube penetrating positioning tool which comprises a positioning rod and a positioning sleeve. The tool is characterized in that a threaded section is arranged in the middle of the positioning rod, a threaded hole is formed in the rear section of the positioning sleeve and connected with the threaded section, a locking nut is connected to the threaded section on the rear side of the positioning sleeve, the positioning rod is sleeved with the front section of the positioning sleeve, and a positioning end face is arranged on the positioning rod on the front side of the threaded section and located behind the front end face of the positioning sleeve in the axial direction. At least one notch is formed in the side wall of the positioning sleeve on the front side of the threaded hole; the pipe penetrating device has the advantages of being accurate in pipe penetrating positioning and good in overhanging length consistency, sealing welding quality can be guaranteed, the application range is wide, operation is convenient, and working efficiency can be improved.

The utility model relates to the technical field of models, in particular to a motorcycle model for power improvement, which comprises a rear wheel swing arm, a driving component is mounted on the inner side of the rear wheel swing arm, and a rear wheel is mounted on the driving component; the driving assembly comprises a model airplane motor, a steel sleeve is fixedly connected to the outer wall of the model airplane motor, a rear wheel is connected to the steel sleeve in a matched mode, a fixing disc is fixedly connected to one end of the model airplane motor through a locking nut, a threaded hole is formed in the side wall of the fixing disc, and a bolt in threaded connection with the threaded hole is inserted into a rear wheel swing arm. According to the motorcycle model for power improvement, the model airplane motor can be directly fixed to the rear wheel swing arm, due to the fact that the model airplane motor is used, power output is better, due to the fact that the model airplane motor directly drives the rear wheel to move through power, friction loss is avoided, the motorcycle model has the advantages of being free of maintenance, high in reliability and simple in structure, and compared with a traditional power output mode, the model airplane motor is more convenient to use. The model airplane motor is lower in position and lower in gravity center, so that the stability of the vehicle during operation can be improved.

The utility model discloses a clamping ring structure, belongs to the technical field of pipeline connecting pieces, and solves the problem that an existing steel belt type hoop is inconvenient to assemble and disassemble. The device comprises an assembling screw rod, a locking nut and a stainless steel band with an opening, a rotating shaft is rotationally installed in the open end of the stainless steel band, a plurality of V-shaped lining plates arranged at intervals are arranged on the inner wall of the stainless steel band, and one end of the assembling screw rod penetrates through the stainless steel band to be detachably connected with one rotating shaft; one end of the assembly screw rod is connected with the stainless steel band, the other end of the assembly screw rod penetrates through the stainless steel band and the other rotating shaft and is in threaded connection with the locking nut, the assembly screw rod between the stainless steel band and the locking nut is movably sleeved with a T-shaped sleeve, and the assembly screw rod between the T-shaped sleeve and the locking nut is further movably sleeved with a pressing sleeve. The V-shaped lining plate is a casting piece or a forging piece. According to the clamping ring structure, the structural strength can be effectively improved, the service life is prolonged, and meanwhile disassembly and assembly are further facilitated.

The utility model relates to an adjustable damping structure which comprises an output shaft, a driving motor, a damping piece and an adjusting assembly. The driving motor is connected with the output shaft and is used for driving the output shaft to rotate; the damping piece is installed on the output shaft and used for generating friction with the output shaft when the output shaft rotates. The adjusting assembly comprises a spring, a rotation stopping gasket and a locking nut which are sequentially installed on the output shaft, the damping piece is arranged on the side, away from the rotation stopping gasket, of the spring, and rotation stopping tooth-shaped parts which can be meshed with each other are arranged on the surface of the rotation stopping gasket and the surface of the locking nut. Wherein the output shaft is provided with a thread matched with the locking nut. The damping torque can be adjusted in real time, operation is easy and convenient, the anti-loosening function is achieved, it can be ensured that the damping torque is output stably, and use reliability is effectively improved.