160results about "Inertia force compensation" patented technology

The invention discloses a bridge electromagnetic inertial mass hybrid control damping system and an overall hybrid control method. The damping system comprises an inertial mass assembly, an electromagnetic assembly, a rigidity assembly and a corresponding parameter adjusting circuit. Wherein the ball screw system is used for converting linear translation into rotation, the inertial mass assembly is used for providing acceleration type inertial mass damping, the electromagnetic assembly is used for providing speed type electromagnetic damping, and the rigidity assembly is used for providing rigidity. In a normal operation stage, a parameter adjusting circuit is utilized, and the purpose of adjusting electromagnetic damping and rigidity values is achieved by changing circuit input, so that semi-active tuning is realized; under the action of an earthquake, circuit input is fixed, so that parameters of the damper are constant, and the anti-seismic robustness of the damper can be improved.

The invention belongs to the technical field of vibration control, and discloses a tuned mass damping device for controlling low-frequency vertical bending vortex vibration of a large-span bridge, which consists of a fixed pulley, a mass block, a high-strength light force transmission cable, a spring, a hanging ring and a damper. Fixed pulleys and mass blocks are arranged at the positive and negative maximum displacement positions of a longitudinal bridge direction mode of a main beam respectively, a suspension system is formed by a full-length force transmission cable, and the gravity of the two mass blocks is basically balanced; the mass block is connected through the spring and is close to the bridge vibration control target frequency. When the bridge vibrates, the two mass blocks generate inertia forces which are opposite in direction but overlapped with each other, the driving system and the bridge form resonance, and therefore bridge vibration is effectively restrained. The gravity of the mass block can be self-balanced, the strength and the number of the springs are greatly reduced compared with those of a traditional TMD, any low-frequency tuning can be conducted in a vertical limited space, and the engineering cost is remarkably reduced. The device can be used for controlling vertical bending and torsional vibration of various engineering structures; the damper is replaced by an actuator, so that active control can be realized or the damper can be used as a structural excitation device.

The invention relates to the technical field of vibration control, and particularly provides an ultralow-frequency passive self-adaptive tuning vibration absorber based on a string-mass system, which comprises a mechanical sensing assembly, a mechanical driving assembly, a mechanical transmission assembly and a tuning vibration absorption assembly which are arranged on a target structure, the mechanical sensing assembly and the mechanical driving assembly are correspondingly arranged, and the mechanical sensing assembly is used for sensing vibration of a target structure and can generate relative movement; the mechanical driving assembly is connected with the mechanical transmission assembly, and the mechanical driving assembly drives the mechanical transmission assembly to work based on relative motion generated by the mechanical sensing assembly; the mechanical transmission assembly is connected with the tuning vibration absorption assembly. The vibration absorber is wide in application range, compared with an existing self-adaptive tuning vibration absorber, the vibration absorber has the advantages that external power supply driving is not needed, the structure is simple, ultralow-frequency vibration control can be achieved, and effective control over broadband even multi-order modal vibration is achieved through a pure mechanical structure.

A composite damping device for vibration reduction of a tower drum and blades of an offshore wind turbine belongs to the technical field of vibration reduction of wind driven generators, and is characterized by comprising a blade integration unit and a tower drum tuning unit, the blade integration unit adopts a cylindrical particle damping cavity, the center of the cylinder is connected with a mass ball through a spring, and the cavity is filled with damping particles; the steel wire rope is fixed in the blade to restrain vibration displacement; the tower tube tuning unit is connected with the mass block through a steel wire rope, the mass block is circumferentially provided with the springs and connected with the tower tube wall, the lower portion of the mass block is connected with the mass ball, and the upper periphery and the lower periphery of the mass block are connected with the tower wall through the hydraulic inerter dampers. And the working space is obviously reduced, the multi-direction vibration control capability is improved, and the method is suitable for vibration control of offshore wind turbine towers and blades.

The adjustable inertia connecting rod vibration isolation device comprises a vibration isolation base, a vibration isolation platform, a connecting rod mechanism and a spring element, the connecting rod mechanism comprises two sets of connecting rod assemblies which are in bilateral symmetry, each connecting rod assembly comprises an upper connecting rod and a lower connecting rod, and the upper connecting rods and the lower connecting rods are hinged through bearings; each connecting rod assembly is connected with the vibration isolation platform and the vibration isolation base through bearings. The spring element comprises a compression spring and an extension spring, and the compression spring is vertically arranged between the vibration isolation base and the vibration isolation platform; the extension spring is horizontally connected with bearing joints of the left and right symmetrical connecting rod assemblies; an upper connecting rod and a lower connecting rod of the connecting rod assembly extend outwards along a connecting point to form a lever arm, a plurality of mass block mounting holes are formed in the tail end of the lever arm, and mass blocks with different masses can be detachably mounted. A parallel stiffness structure is formed through the compression spring and the extension spring, the mass size and the mounting position of the mass block are adjusted on the lever arm, and ultralow-frequency quasi-zero stiffness band gap vibration isolation is cooperatively achieved.

The invention discloses a vibration motor crankshaft vibration device and a wind power coal picker comprising the same, and relates to the technical field of mining equipment.The vibration motor crankshaft vibration device comprises a main shaft, a main middle section, a main eccentric section, a main transition section, a crank section and a main tail section from the middle to the two ends; the first shaft ends are fixedly arranged at two ends of the main shaft and are eccentrically arranged; the auxiliary shaft comprises an auxiliary middle section, an auxiliary eccentric section and an auxiliary tail section from the middle to the two ends; the second shaft ends are fixedly arranged at the two ends of the auxiliary shaft and are eccentrically arranged with the auxiliary shaft; the main eccentric block is fixedly arranged on the main eccentric section; the auxiliary eccentric block is fixedly arranged on the auxiliary eccentric section; driving gears are mounted at the end parts of the first shaft end and the second shaft end of the transmission shaft; the driving shaft is fixedly arranged at the end part of the transmission shaft and is used for driving the motor; the rocker arm connecting rod is rotationally connected to the crank section; the vibration motor has the effect of prolonging the service life of the vibration motor for mineral screening, so that the probability of maintenance and failure of the coal separator is reduced, and the coal separation yield and the production efficiency are improved.

A load device assembly includes: an idler gear that rotates in conjunction with the rotation of a power gear of the internal combustion engine; a driven gear that rotates by receiving a rotational force of the power gear via the idler gear, the idler gear being arranged between the driven gear and the power gear; and a load device that rotates together with the driven gear. Compared with the first inertia by a first mass required at least for the rotation of a shaft serving as a load of the power gear, the inertia of the driven gear and the shaft is set as a second inertia larger than the first inertia, the second inertia being made larger to approximate the inertia of the power gear. The idler gear has openings.Third inertia caused by the rotation of the idle gear is less than fourth inertia when the orifices are not present.

Vibration is detrimental to an internal combustion engine and its mounting system. It can damage internal parts, attached accessories, and mounting fixtures. Vibration can also cause discomfort to vehicle occupants or equipment operators. Managing, reducing, or eliminating vibration often involves additional cost in the design and manufacture of an engine and / or its mounting system. The subject invention is a unique arrangement of the cylinders of an eight-cylinder internal combustion engine that completely balances the forces produced by the eight pistons. Vibration due to piston motion is eliminated without the use of additional internal balancing devices. Special mounting structures are no longer necessary. This arrangement can be used with equal success in air compressors, liquid pumps, external combustion engines, or any other device using the familiar piston / connecting rod / crankshaft mechanism and requiring eight cylinders.

The present application provides a scroll compressor, which comprises a housing, a scroll mechanism, a motor driving the scroll mechanism through a driving shaft, and a bearing seat in which a first bearing and a second bearing are arranged and which are arranged on one side of the motor in an axial direction to support the driving shaft, wherein the motor and the bearing seat are accommodated inside the housing, and the scroll compressor further comprises a first balance block matched with the driving shaft, and the bearing seat, the first bearing and the second bearing constitute a first cavity in which the first balance block is located. According to the present application, the load on the bearing of the scroll compressor is significantly reduced, thereby prolonging the service life of the bearing and the compressor.

The utility model discloses a compact high-performance parallel double-cylinder engine, which comprises an engine main body, a crankshaft assembly and a speed change assembly are symmetrically arranged in the engine main body, and a balance shaft assembly connected with the crankshaft assembly is arranged in the engine main body between the crankshaft assembly and the speed change assembly. A cylinder head is arranged at the top of the engine body, an air inlet assembly and an exhaust assembly are arranged on the cylinder head, a piston assembly connected with the crankshaft assembly is arranged in the cylinder head, a first transmission wheel and a second transmission wheel are rotationally arranged on the side wall of the engine body, the first transmission wheel is connected with the crankshaft assembly, and the second transmission wheel is connected with the second transmission wheel. The first transmission wheel is connected with a driving shaft in the speed change assembly, the second transmission wheel is connected with a driving shaft in the speed change assembly, and meanwhile the first transmission wheel and the second transmission wheel are sleeved with the transmission belt, so that the engine has the beneficial effects that the occupied space of the engine during installation is reduced, and the compactness of the engine is guaranteed.

The balancer device includes: an idler shaft having an idler sprocket around which a drive chain is wound, and an idler gear integrated with the idler sprocket; and a balancer housing accommodating, thereinside, balancer shafts generating a vibratory force by the rotation force transmitted from the idler gear. The balancer housing includes: a support part which is provided on the outer part of an upper housing, and supports an end portion of the idler shaft; a boss portion which is provided at a position away from the support part; and a first reinforcing part and second reinforcing part which are disposed between the support part and the fixing portion to reinforce the lower part on the lower housing side of the support part. Consequently, it is possible to suppress the occurrence of noise and vibration between an idle gear and a drive side gear.

A method for active vibration control system (AVCS) monitoring and control is disclosed. The method comprises receiving inputs to a protection monitor to monitor one or more force generators, comparing the inputs to one or more values, and shutting down or adjusting the one or more force generators if the one or more force generators are determined to be operating at an undesired condition.

The utility model discloses a diaphragm pump structure capable of adjusting dynamic balance, which comprises a crankshaft comprising a first shaft section and a second shaft section, the crankshaft is provided with a shaft hole along the axial direction of the crankshaft, the center line of the shaft hole is parallel to and does not coincide with the center line of the first shaft section, and the center line of the shaft hole is coincide with the center line of the second shaft section; the motor shaft penetrates through the crankshaft through the shaft hole, and the motor shaft is fixedly connected with the crankshaft; the first shaft section is sleeved with the crank support, and the first shaft section is connected with the crank support through a bearing; the diaphragm assembly is arranged on the crank bracket; the balance sleeve is arranged on the second shaft section in a sleeving manner; and the balancing weight is detachably locked on the balancing sleeve. According to the diaphragm pump structure capable of adjusting the dynamic balance, when the external load of the diaphragm pump changes, different configurations can be achieved by replacing the balancing weights with different loads, manual adjustment of the dynamic balance is completed, inertia force of rotating components is offset, the diaphragm pump achieves the optimal dynamic balance, and the vibration amplitude is reduced.

To allow for easy adjustment of the crankshaft balance without removing the crankshaft itself. [Solution] In an auxiliary machine (62) that is coaxially connected to a crankshaft (41) supported by a crankcase (31) and rotates together with the crankshaft (41), a first transverse hole (62k) is provided on the outer circumference (62g) of the auxiliary machine (62) on the crankshaft support portion (48L) side of the crankcase (31), with the crankshaft support portion (48L) provided on the crankcase (31) in between, and extending in the axial direction of the crankshaft (41) at a circumferential spacing, and an adjustment weight (97) is selectively inserted into the first transverse hole (62k).

The utility model belongs to the technical field of compressors, and particularly discloses a crankshaft dynamic balance counterweight assembly, a compressor and refrigeration equipment, the crankshaft dynamic balance counterweight assembly comprises a crankshaft, a first balancing weight, a second balancing weight, a balancing block and a positioning column, the first balancing weight is detachably connected with a crank, the second balancing weight is detachably connected with an eccentric shaft, and the balancing block is detachably connected with the crankshaft. And different counterweights can be conveniently replaced for testing in the dynamic balance checking process. The balancing block is connected with the second balancing weight in a sliding mode, the balancing block can be kept static relative to the second balancing weight through the positioning columns arranged on the two sides of the balancing block, and the balancing weight can be finely adjusted by adjusting the balancing block and the positioning columns. In addition, the crankshaft dynamic balance counterweight assembly is high in part universality, and diversified crankshaft balancing schemes can be provided for compressors of different models.

Provided is a balancer device including: a pair of balancer shafts 12, 13 respectively having first and second counter weights 31, 32 and first and second counter weights 33, 34 for generating an excitation force by a rotational force transmitted from an internal combustion engine; and a balancer housing 11 having a housing chamber 11a in which the pair of balancer shafts are rotatably housed. The balancer housing has a lower housing 16 and an upper housing 17. On opposed inner surfaces of both side walls 20, 20 of at least the upper housing, projection parts 38 are provided, of which tip parts 28a project toward recessed parts 31a, 32a provided in recessed shapes in the radial direction of the counter weights 31, 32. With this configuration, it is possible to suppress an increase in size while increasing the rigidity of the housing of the balancer device.

The invention relates to the technical field of vibration reduction, in particular to a pendulum bob type tuned impact mass damper which comprises a mass block, a steel strand and an impact part. Wherein the mass block is internally provided with an accommodating space with an opening at one end; one end of the steel strand is connected with the damped structure, and the other end is connected with the mass block; the impact part is arranged in the containing space, the outer contour of the impact part is smaller than the inner contour of the containing space, and the impact part can move in the containing space. The problems that in the prior art, a pendulum damper can only have a good vibration control effect on vibration corresponding to the design frequency, and the vibration control effect on vibration deviating from the design frequency is poor can be solved.

The utility model provides a compressor rotor structure and a rotor compressor, and the compressor rotor structure comprises a motor rotor; the crankshaft penetrates through the motor rotor; the first balance block is arranged at the first end of the motor rotor, the second balance block is arranged at the second end of the motor rotor, and the first end and the second end are the two opposite ends of the motor rotor in the axial direction; the first balance block and the second balance block are formed through a powder metallurgy process in a die-casting mode. The first balance block and the second balance block adopt the same die-casting die, the first balance block and the second balance block are different in size in the height direction, and the height direction is the punch moving direction of the first balance block and the second balance block in the die-casting process. The compressor provided by the utility model solves the technical problem of high manufacturing cost of the rotor balance block of the compressor in the prior art.

The present invention provides a compressor and an air conditioner having the same. The compressor includes a crankshaft, on which a plurality of eccentric portions are provided, the plurality of eccentric portions including a first eccentric portion and a second eccentric portion; a crankshaft balance block, the crankshaft balance block being connected to the end of the crankshaft, the first eccentric portion, the second eccentric portion, and the crankshaft balance block being arranged in sequence downward along the axis of the crankshaft; wherein the center distance between the crankshaft balance block and the first eccentric portion is L2, and the center distance between the crankshaft balance block and the second eccentric portion is L3, and 0.35≤L3 / L2≤0.75. This arrangement can effectively reduce deformation of the crankshaft during high-speed operation, reduce friction damage between the crankshaft and internal components of the compressor, and reduce vibration of the compressor.

The invention provides a balance mechanism and an engine, the balance mechanism comprises a balance shaft, the axial direction of the balance shaft is parallel to the axial direction of a crankshaft of a horizontally opposed two-cylinder engine; the axial direction of the crankshaft is parallel to or the same as the Y-axis direction; the two cylinders are located on the two sides of the crankshaft in the X-axis direction respectively and distributed in the Y-axis direction at intervals. The balance shaft is used for being connected with the crankshaft through the preset gear assembly, so that when the crankshaft rotates, the balance shaft is driven to rotate in the direction opposite to the rotating direction of the crankshaft at the same rotating speed; the balance assembly comprises a bevel gear assembly and a balance part, and the bevel gear assembly is connected with the balance shaft and the balance part, so that the rotating axis of the balance part is parallel to or the same as the Z-axis direction; the two balance assemblies are distributed in the axial direction of the balance shaft. The two balance parts are oppositely arranged in the X-axis direction, and the rotation directions of the two balance parts are opposite, so that the two balance parts generate force in the X-axis direction to balance the reciprocating inertia force of the two cylinders correspondingly.

The invention relates to the technical field of engine crankshafts, and discloses a crankshaft structure for a large-cylinder-diameter engine, a crankshaft comprises a main journal, a crank arm and a crank pin, a crank pin circular bead is arranged at the crank pin, a main journal circular bead is arranged at the main journal, and the crank pin circular bead and the main journal circular bead are both arranged to be of a concave smooth circular bead structure. The torsional vibration and the strength of the crankshaft are improved; a crank arm of the crankshaft is connected with the balance block, a protrusion is arranged in the middle of the top face of the balance block, and the balance block and the crank arm are in butt joint and fixed through the protrusion. By means of the inwards-concave type fillet structure, the specific crank arm thickness, the specific crank pin diameter and the specific main journal diameter, the use requirement for safety of an 8L2842 engine is met; the crankshaft shock absorber end reduces oil pressure fluctuation through the oil plug with the throttling hole, and the stability of the shock absorber is improved. According to the flywheel end, the flange is used, the machining difficulty of the main gear is simplified, the inverted-T-shaped balance block can concentrate mass points on the outer circle, and the mass of the balance block is reduced under the condition that balance is achieved.

The invention relates to the technical field of inertia rings, and discloses a high-precision inertia ring and a circumferential mass compensation forming process thereof.The high-precision inertia ring comprises a plurality of arc-shaped cylinders, the multiple arc-shaped cylinders are sequentially connected end to end to form the inertia ring of a closed annular structure, every two adjacent arc-shaped cylinders are fixedly connected through a welding seam at the splicing position, and a containing groove is formed in the splicing position; the containing groove is filled with a balance weight piece, and the balance weight piece is used for correcting the uniformity of mass distribution in the circumferential direction of the inertia ring. According to the high-precision inertia ring and the circumferential mass compensation forming process thereof, the accommodating groove at the splicing part is filled with the counterweight piece capable of compensating the mass deviation, so that the circumferential mass of the inertia ring is accurately adjusted; the technical problem of uneven circumferential mass distribution caused by factors such as welding process fluctuation, uneven solder filling and operation difference of an existing inertia ring formed through stamping and welding is solved from the structural level, and the dynamic balance precision and the operation stability of the inertia ring during high-speed rotation are remarkably improved.

This invention relates to the field of stacker crane technology, specifically to a stacker crane column adaptive balancing and off-center load adjustment device, comprising a horizontal track, a horizontal moving platform, a vertical track, a vertical moving platform, and a loading platform. The vertical moving platform is equipped with an adjustment mechanism for adaptively adjusting off-center load. The adjustment mechanism includes a U-shaped tube installed inside the vertical moving platform, with its two open ends facing the surface of the vertical track. This invention addresses problems such as tilting of the vertical moving platform, unilateral wear of the track, and unstable operation caused by off-center load on the loading platform by incorporating an adaptive adjustment system within the vertical moving platform. When off-center load causes tilting, a gravity pendulum drives a piston inside the U-shaped tube via a connecting rod to generate a pressure difference, thereby controlling the rotation of the pressure plate and dynamically adjusting the pressure distribution of the upper and lower pulleys on the vertical track, generating a reverse torque to counteract the off-center load effect in real time. Real-time dynamic balancing can be achieved without external control, effectively suppressing tilting, equalizing wear, and improving operational stability and accuracy.

The utility model provides a connecting mechanism for a high-speed-ratio hydraulic motor, which relates to the technical field of motor connecting components and comprises a hydraulic motor main body and stress equipment, a connected meshed cylinder is arranged on the surface of the stress equipment, an output shaft is arranged at one end of the hydraulic motor main body, and the surface of the output shaft is in key connection with the connected meshed cylinder. The phenomenon that an output end far away from one end of a high-speed-ratio hydraulic motor is prone to generating violent vibration and unstable shaking is solved by installing an arc pressing piece, and an existing connecting mechanism usually adopts reinforcing measures such as an annular iron sheet and a bolt to enhance the stability of a key connecting position. However, the surface of stressed equipment can be scraped by using an annular iron sheet and a bolt, the appearance and the service life of the equipment are influenced, secondly, although the connection stability can be improved to a certain extent through reinforcement, the tail end of the output end is still difficult to be completely controlled to shake, and especially under the condition of high load or long-time operation, the stability of the output end cannot be completely controlled. The shaking can cause fatigue damage at the joint, and potential safety hazards are increased.

This invention provides a spindle assembly for a scroll compressor and a compressor. The spindle assembly includes a spindle, a balance block, and a swing sleeve. Only a connecting portion is provided at the top of the spindle. The balance block includes an integrally formed spindle mating portion, a balancing portion, an eccentric cylindrical portion, and a stop rib portion. The spindle mating portion and the eccentric cylindrical portion are located on opposite sides of the balance block, and the balance block is connected to the spindle via the connecting portion of the spindle mating portion. The swing sleeve is a ring structure with an inner hole that is not concentric with the outer circle. It is fitted onto the eccentric cylindrical portion of the balance block with a clearance fit. The swing sleeve can rotate around the eccentric cylindrical portion, and the stop rib portion is used to limit the retraction angle of the swing sleeve. This invention integrates the eccentric structure of a traditional spindle onto the balance block, simplifying spindle machining. Through the fixed connection between the balance block and the spindle, it solves the vibration problem caused by the balance block swinging with the swing sleeve during compressor startup or operation with liquid, while also reducing cost and noise.

The application belongs to the technical field of vibration control equipment, and particularly relates to a rotary inertia mass damping passive damping device with apparent mass self-adjustment with displacement. The rotary inertia mass damping passive damping device comprises a self-adaptive inertia mass unit, the self-adaptive inertia mass unit comprises a flywheel, the flywheel comprises a flywheel body, a rotating hole is formed through the middle part of the flywheel body, four sliding grooves are uniformly formed around the flywheel body, and a mass block is slidably connected to the sliding grooves. The application can realize self-adaptive control of structural dynamic response under different intensity excitations. The application can not only ensure that the mass block is in the initial position before each adjustment, prevent the problem of excessive initial apparent mass, ensure the mass balance of the flywheel, and avoid the problems of wear and damage during operation; the application can not only quickly find external large intensity excitation, but also quickly replace the type and weight of the mass block.

The utility model relates to the technical field of shock absorbers, and discloses a crankshaft torsion shock absorber for an automobile engine, which is used for a new energy extended-range hybrid engine and comprises a hub, a rubber ring and an inertia ring. The resonant frequency of the crankshaft is reduced through the inherent frequency of the TVD, so that torsional vibration of the engine crankshaft is reduced, and the NVH performance of the engine is improved. The whole device is arranged in an engine housing, the TVD is installed at the end of the crankshaft and attached to the end face of the timing chain wheel, the overall shaft diameter of the engine crankshaft and the TVD can be effectively shortened, the vibration condition of the crankshaft can be effectively reduced through shortening of the crankshaft, and the NVH effect of an engine is better. In addition, due to the sealing effect of the engine housing, the noise condition caused by the crankshaft torsion damper in the whole engine can be effectively reduced. And finally, as the whole device is arranged in the engine housing, the original crankshaft oil hole in the engine housing can be canceled from being sealed, an oil seal does not need to be arranged, and the possibility of oil leakage can be effectively avoided.

The utility model relates to a balance shaft for a range extender two-cylinder engine. The balance shaft comprises a balance shaft body, a first ball bearing, a second ball bearing and a balance shaft gear, the balance shaft body is integrally formed by a first cylindrical section, a balance shaft, a deviation weight, a second cylindrical section and a third cylindrical section, the first ball bearing is arranged on the first cylindrical section in a sleeving mode, and the second ball bearing is arranged on the second cylindrical section in a sleeving mode. The first cylindrical section is sleeved with the first ball bearing, the second cylindrical section is sleeved with the second ball bearing, the third cylindrical section is sleeved with the balance shaft gear, the first cylindrical section is further provided with a check ring installation groove, and an elastic check ring is installed in the check ring installation groove. The first cylindrical section, the balance shaft, the deviation heavy block, the second cylindrical section and the third cylindrical section are integrally formed, so that the balance shaft and the deviation heavy block do not need to be assembled, the assembling procedure, a positioning tool for assembling and part of connecting bolts are omitted, the assembling efficiency can be obviously improved, and the production cost is saved.

The utility model belongs to the technical field of transmission parts, and particularly relates to a shock-resistant and wear-resistant lead screw which comprises a lead screw body, and a threaded groove is formed in the surface of the lead screw body. The nut is arranged on the lead screw body and is in transmission connection with the lead screw, a through hole is formed in the nut, and a plurality of ball grooves are formed in the inner wall of the through hole; the anti-seismic part always shows the relative movement trend opposite to the vibration acceleration direction of the lead screw main body under the action of inertia; the wear-resistant part is arranged on the surface of the lead screw main body; wherein the anti-vibration part is arranged in the lead screw body, the balls are rotationally arranged in the ball grooves, and compared with the prior art, the precision and stability of the lead screw can be effectively improved.