Novel motor type on-line automatic balancing device with positionable counterweight disc

Abstract

The invention discloses a novel motor type on-line automatic balancing device with a positionable counterweight disc. The novel motor type on-line automatic balancing device comprises a rotating part, a gear part, a static part, a conductive slip ring and a connecting bearing, the connecting bearing comprises two moving ring bearings and two static ring bearings; the rotating part and the gear part are connected through two moving ring bearings, and the gear part and the static part are connected through two static ring bearings; the rotating component mainly comprises a moving ring, two ultrasonic motors and a reference magnet; the gear component comprises two groups of planet gears and gear rings which are meshed with each other, two counterweight plates, two counterweight blocks, a positioning magnet I and a positioning magnet II; the static part mainly comprises a static ring, an aviation plug frame, a first side end cover, a second side end cover, a first positioning Hall element, a second positioning Hall element and a reference Hall element, according to the invention, a dynamic and static ring structure is adopted, and the positions of the reference magnet and the positioning magnet I and the positioning magnet II at the corresponding positions are sensed through the reference Hall element, the positioning Hall element I and the positioning Hall element II, so that the specific phases of the two counterweight discs are detected, and the counterweight discs are positioned.

Description

Technical Field

[0001] The invention relates to an online automatic balancing device for a rotor, in particular to a novel motor-type online automatic balancing device with a positionable counterweight disc. Background Art

[0002] Rotating machinery, as core power equipment in fields such as energy development, chemical production, and high-end equipment manufacturing, has a significant impact on the safety and economic efficiency of industrial production. Unbalanced vibration in the rotor system is a common fault in rotating machinery. Using an online automatic balancing device not only enables real-time acquisition of rotor vibration characteristics and rapid vibration suppression, but more importantly, it can adjust the rotor system's imbalance during long-term operation, ensuring it consistently operates in a well-balanced state. This significantly improves the equipment's operational reliability and maintenance efficiency. This online automatic balancing device is currently the optimal solution for resolving rotor imbalance and ensuring long-term stable rotor operation.

[0003] Online automatic balancing devices are categorized by the method used to drive the eccentric mass: liquid, electromagnetic, and motor-operated. Motor-operated online automatic balancing devices are characterized by their compact size, wide applicability, and simple installation. These devices effectively offset rotor imbalance by moving a pre-positioned mass within the motor's movement mechanism. Within their balancing capacity, these devices repeatedly suppress rotor imbalance vibrations by adjusting the mass's phase in real time. These balancing devices have proven themselves in the machine tool industry.

[0004] The first motor-type online automatic balancing device was designed by Canadian scholar Vande Vegte. It uses two small motors through a worm gear structure to drive the counterweight mass block, but it has the disadvantages of complex structure, easy wear of carbon brushes, and requires special motors. In 1995, Sun Baodong and others from Harbin Institute of Technology used infrared remote control to control the balancing device, but their device had shortcomings in structural design and installation. A dual-counterweight polar coordinate mechanical automatic balancing device designed by Xi'an University of Science and Technology is powered by a motor and drives the counterweight disk to rotate through a worm gear and a turbine gear, but its transmission system is relatively complex. The Chinese invention patent application with publication number CN102175396A discloses an online automatic balancing device for high-speed electric spindle rotors. It uses the inverse piezoelectric effect of piezoelectric ceramic sheets to convert high-frequency radio waves into mechanical vibrations to drive the rotation of the counterweight block, but its structure is highly complex and difficult to process. The Chinese invention patent application with publication number CN110768453A discloses an integrated ultrasonic motor automatic balancing device, which uses an ultrasonic motor to drive the counterweight to step, but it can only be installed at the end of the shaft, and the installation position is limited. In order to enrich its installation position, the Chinese invention patent application with publication number CN114337159A discloses a motor-type online automatic balancing device that can be installed through the shaft and can be installed in the shaft. However, the above-mentioned motor-type online automatic balancing devices lack a counterweight plate positioning solution, making it difficult to achieve high-precision balancing, with a long balancing cycle and weak anti-interference ability. During the vibration control process, the phase of the counterweight plate cannot be known, resulting in the counterweight plate movement path being difficult to control and causing the vibration to intensify. Therefore, there is an urgent need to design a new motor-type online automatic balancing device with a positionable counterweight plate to solve the problem of the unknown phase of the counterweight plate in the existing motor-type online automatic balancing device, so as to improve the controllability of the balancing device and increase the reliability of the balancing device. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems of existing motor-type online automatic balancing devices that lack a counterweight plate positioning solution, are difficult to achieve high-precision balancing, have a long balancing cycle, and have weak anti-interference ability, and to provide a new motor-type online automatic balancing device with a short balancing cycle, strong anti-interference ability, reliable and safe operation, higher work efficiency, and the ability to achieve counterweight plate positioning.

[0006] To achieve one of the above purposes, the present invention adopts the following technical solution:

[0007] The novel motor-type online automatic balancing device with a positionable counterweight plate of the present invention comprises a rotating component, a gear component, a stationary component, a conductive slip ring, and a connecting bearing which are sleeved on the outside of a target rotor; the connecting bearing comprises two dynamic ring bearings and two stationary ring bearings; the rotating component and the gear component are connected via the two dynamic ring bearings, and the gear component and the stationary component are connected via the two stationary ring bearings; the rotating component comprises a dynamic ring, two ultrasonic motors, two expansion sleeves, an expansion sleeve flange, a motor shaft end cover fixed to the shaft ends of the motor shafts of the two ultrasonic motors, a conductive slip ring bracket, a threaded retaining ring, and a reference magnet; the rotating component is interference-fitted with the target rotor via the expansion sleeve, the expansion sleeve is mounted on both sides of the inner circumference of the dynamic ring, the expansion sleeve flange and the conductive slip ring The brackets are fixed on both sides of the moving ring and press the expansion sleeve; the moving ring is loosely fitted outside the target rotor; two ultrasonic motors are symmetrically installed in the ultrasonic motor mounting holes of the circular plate structure of the moving ring in opposite directions; the reference magnet is installed at the largest outer circumference of the moving ring; steps are provided on both sides of the outer circumference of the moving ring, and the two moving ring bearings are respectively installed on both sides of the moving ring and are respectively located between the moving ring and the two counterweight plates. The inner rings of the two moving ring bearings are tightly fitted with the outer circumference of the moving ring, and one side is positioned by the steps provided on the outer circumference of the moving ring, and the other side is positioned by a threaded retaining ring; the cylindrical outer circumference of the conductive slip ring bracket is fixedly connected to the inner circumference of the movable element of the conductive slip ring; the gear component includes two sets of meshing planetary gears and gear rings, two counterweight plates, and two counterweight blocks , positioning magnet 1, positioning magnet 2; the planetary gear and the motor shaft of the ultrasonic motor form a hole-axis fit and are fixedly connected by a key, one side of the planetary gear is axially positioned by the motor shaft shoulder, and the other side is close to the motor shaft end cover; the gear ring and the counterweight are respectively fixedly connected to the two sides of the counterweight plate; the inner circle of the counterweight plate supports the outer ring of the dynamic ring bearing, and the outer circle of the counterweight plate supports the inner ring of the static ring bearing, and the dynamic ring bearing and the static ring bearing are in the same radial plane; the positioning magnet 1 and the positioning magnet 2 are respectively fixed on the two counterweights, the positioning magnet 1 is set close to the side end cover 1, and the positioning magnet 2 is set close to the side end cover 2; the stationary parts include an integrated static ring and an air plug frame, the side end cover 1, the side end cover 2, two static ring bearing outer retaining rings, the air plug frame cover, the positioning Hall element 1, the positioning Hall element 2, reference Hall element; the reference Hall element is installed on the inner circular surface of the static ring, and its position corresponds to the reference magnet, which is used to detect the position of the reference magnet; the static ring is sleeved outside the dynamic ring, and circular grooves are opened on the inner circular surfaces on both sides of the static ring. The outer ring of the static ring bearing fits tightly with the circular groove surface and is positioned through the step hole, and the other side is positioned through the outer retaining ring of the static ring bearing; the side end cover 1, one of the static ring bearing outer retaining rings and the end face of one side of the static ring are fixedly connected by bolts, and the side end cover 2, the other static ring bearing outer retaining ring and the end face of the other side of the static ring are fixedly connected by bolts; the end faces of the side end cover 1 and the side end cover 2 have mounting grooves along the diameter direction, and the positioning Hall element 1 is fixed in the mounting groove of the side end cover 1, and its position corresponds to the positioning magnet 1, which is used to detect the position of the positioning magnet 1;Positioning Hall Effect Element 2 is fixed in the mounting slot of side cover 2, corresponding to positioning magnet 2, and is used to detect the position of positioning magnet 2. The reference Hall Effect Element, positioning Hall Effect Element 1, and positioning Hall Effect Element 2 can detect the specific phase of the two counterweight plates. The motor control wires of the ultrasonic motor are connected to the movable end of the conductive slip ring. The wires of positioning Hall Effect Element 1 and positioning Hall Effect Element 2, the wires of the reference Hall Effect Element, and the wires of the stator end of the conductive slip ring are all connected to the aviation plug of the aviation plug bracket. The aviation plug bracket cover is tightly attached to the left and right sides of the aviation plug bracket and is fixedly connected.

[0008] The present invention provides a novel motor-type online automatic balancing device with a positionable counterweight plate, wherein identical circular grooves are provided on both sides of the inner circular surface of the dynamic ring, the expansion sleeve is installed in the circular grooves, a plurality of threaded holes are provided on both sides of the dynamic ring, through holes are provided on the end faces of the expansion sleeve flange and the conductive slip ring bracket and at positions corresponding to the threaded holes, the expansion sleeve flange and the conductive slip ring bracket are connected to both sides of the dynamic ring by bolts and press the expansion sleeve.

[0009] The present invention provides a novel motor-type online automatic balancing device with a positionable counterweight plate, wherein the outer circular surface of the dynamic ring is provided with a circular plate structure, ultrasonic motor mounting holes are opened on both sides of the circular plate structure, and multiple threaded holes are provided around each ultrasonic motor mounting hole. Two ultrasonic motors are respectively embedded in the two ultrasonic motor mounting holes in opposite directions and fixed with bolts, and the center distance of the embedding is approximately half the height of the ultrasonic motor.

[0010] The present invention provides a novel motor-type online automatic balancing device with a positionable counterweight plate, wherein rounded rectangular grooves are provided on both sides of the outer circumference of the movable ring and on one end face, intersecting to form a right-angled through hole for routing the ultrasonic motor; a plurality of square grooves are evenly distributed on the outer circumference of the cylinder of the conductive slip ring bracket for accommodating the heads of the locking bolts connecting the slip ring bracket and the movable ring; and two tapered through holes are symmetrically distributed on the end face of the conductive slip ring bracket for routing the ultrasonic motor.

[0011] The invention discloses a novel motor-type online automatic balancing device with a positionable counterweight plate, wherein the key length is equal to the side surface length of the motor shaft and less than the thickness of the planetary gear, and the surface length at the motor shaft shoulder is greater than the height of the bolt head for fixing the ultrasonic motor.

[0012] The present invention provides a novel motor-type online automatic balancing device with a positionable counterweight plate, wherein each counterweight block is a semi-circular ring structure with a through hole on its surface and a positioning block provided thereon, and a bolt hole and a positioning groove are provided at the same position of the counterweight plate, and the two are fastened together by bolts and installed through the positioning block.

[0013] The present invention provides a novel motor-type online automatic balancing device with a positionable counterweight disc, wherein the maximum circular diameter of the counterweight block is larger than the outer diameter of the counterweight disc, and the minimum circular diameter of the counterweight block is smaller than the inner diameter of the counterweight disc.

[0014] The present invention discloses a novel motor-type online automatic balancing device with a positionable counterweight plate, wherein a square hole is opened on a circular surface of one side of each counterweight block, and a first positioning magnet and a second positioning magnet are respectively installed in the two square holes.

[0015] The invention discloses a novel motor-type online automatic balancing device with a positionable counterweight plate, wherein a peephole is provided on the outer annular surface of the static ring, facing the gear meshing position between the planetary gear and the gear ring.

[0016] The present invention discloses a novel motor-type online automatic balancing device with a positionable counterweight plate, wherein the shape of the aerial plug frame is rectangular, the outer surface of the aerial plug frame is provided with aerial plug mounting holes symmetrical about the center, and the surface of the aerial plug frame cover is provided with an arc hole.

[0017] Compared with the background technology, the novel motor-type online automatic balancing device with positionable counterweight plate of the present invention has the following beneficial effects:

[0018] The static ring and dynamic ring structures designed in the present invention belong to the static and rotating parts of the device respectively. The Hall element installed in the static part can sense the phase of the counterweight plate in real time to form a counterweight plate positioning solution, which solves the problem of lack of counterweight plate positioning in the existing motor-type online automatic balancing device.

[0019] The ultrasonic motor used in the present invention has a fast response speed and high positioning accuracy. It can change the internal mass distribution of the device with high precision in a short time, form a compensation vector, offset the target rotor imbalance online, and has a short balancing cycle.

[0020] The counterweight plate positioning solution provided by the present invention can achieve high-precision balancing, short balancing cycle, strong anti-interference ability, reliable and safe operation, faster balancing speed and higher work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic front cross-sectional view of a novel motor-operated online automatic balancing device with a positionable counterweight plate according to the present invention;

[0022] Figure 2 This is a schematic diagram of the placement of three Hall elements and working magnets in the novel motor-type online automatic balancing device with positionable counterweight plate of the present invention;

[0023] Figure 3 A schematic diagram of pulse signals measured by three Hall elements in the novel motor-type online automatic balancing device with positionable counterweight plate of the present invention;

[0024] Figure 4 This is a schematic diagram of the gear transmission principle in the novel motor-type online automatic balancing device with positionable counterweight plate of the present invention;

[0025] Figure 5This is a schematic diagram of the overall structure of a novel motor-type online automatic balancing device with a positionable counterweight plate according to the present invention;

[0026] Figure 6 This is a diagram showing the use of the novel motor-type online automatic balancing device with positionable counterweight plate according to the present invention;

[0027] Figure 7 This is a three-dimensional structural diagram of the dynamic ring in the novel motor-type online automatic balancing device with positionable counterweight plate of the present invention;

[0028] Figure 8 This is a three-dimensional structural diagram of the counterweight plate in the novel motor-type online automatic balancing device with positionable counterweight plate of the present invention;

[0029] Figure 9 This is a three-dimensional structural diagram of the counterweight block in the novel motor-type online automatic balancing device with a positionable counterweight plate of the present invention;

[0030] in:

[0031] 1- expansion sleeve, 1'- target rotor, 2- expansion sleeve flange, 3- dynamic ring, 4- dynamic ring bearing, 5- planetary gear, 6- motor shaft end cover, 7- motor shaft, 8- key, 9- positioning Hall element 1, 10- positioning magnet 1, 11- side end cover 1, 12- stationary ring bearing outer retaining ring, 13- stationary ring bearing, 14- aviation plug-in cover, 15- gear ring, 16- reference Hall element, 17- ultrasonic motor, 18- stationary ring, 19- counterweight plate, 20- positioning magnet 2, 21- counterweight block, 22- side end cover 2, 23- positioning Hall element 2, 24- conductive slip ring bracket, 25- threaded retaining ring, 26- conductive slip ring, 27- reference magnet, 28- aviation plug-in cover, 29- circular plate structure, 30- ultrasonic motor mounting hole, 31- threaded hole, 211- square hole, 212- positioning block. DETAILED DESCRIPTION

[0032] like Figure 1 As shown in the figure, a novel motor-driven online automatic balancing device with a positionable counterweight plate according to the present invention comprises a rotating component, a gear component, a stationary component, a conductive slip ring 26, and connecting bearings, which are mounted on the exterior of a target rotor 1'. The connecting bearings include a dynamic ring bearing 4 and a static ring bearing 13. The rotating component and the gear component are connected by the dynamic ring bearing 4 and the hole-shaft connection, while the gear component and the stationary component are connected by the static ring bearing 13.

[0033] like Figure 1 、 6As shown, the rotating component includes: a dynamic ring 3, two ultrasonic motors 17, a clamping sleeve 1, a clamping sleeve flange 2, the motor shaft 7 of the ultrasonic motor 17, a motor shaft end cap 6 fixed to the shaft end of the motor shaft 7 of the two ultrasonic motors 17, a key 8, a conductive slip ring bracket 24, a threaded retaining ring 25, and a reference magnet 27. The rotating component forms a tight interference fit with the target rotor 1' through the clamping sleeve 1, generating sufficient friction to transmit torque and radial force, so that the rotating component rotates with the target rotor 1', avoiding wear on the surface of the target rotor 1' caused by the bolted connection. The dynamic ring 3 is loosely fitted outside the target rotor 1'. The same circular grooves are opened on both sides of the inner circular surface of the dynamic ring 3 to install the clamping sleeve 1. At the same time, evenly distributed threaded holes are opened on both sides of the dynamic ring 3, which are respectively bolted to the clamping sleeve flange 2 and the conductive slip ring bracket 24 and provide sufficient clamping force to the clamping sleeve 1. The outer circumference of the rotating ring 3 is provided with a circular plate structure 29. Two ultrasonic motor mounting holes 30 are defined on either side of the plate structure 29 for mounting the ultrasonic motor 17. The two ultrasonic motor mounting holes 30 are symmetrical about the center and are surrounded by threaded holes 31. The two ultrasonic motors 17 are inserted into the two ultrasonic motor mounting holes 30 in opposite directions and secured with bolts. The center-to-center distance between the insertion holes is approximately half the height of the ultrasonic motor 17, thereby shortening the axial dimension of the balancing device. A reference magnet 27 is mounted on the largest outer circumference of the rotating ring 3. Steps are provided on both sides of the outer circumference of the rotating ring 3. Rotating ring bearings 4 are mounted on both sides of the rotating ring 3 and on the inner circumference of the counterweight plate 19. The outer circumference of the rotating ring 3 tightly fits the inner ring of the rotating ring bearing 4 and is positioned by the stepped shaft inside the rotating ring 3 and the other side by a threaded retaining ring 25. Through holes are provided on the end faces of the expansion sleeve flange 2 and the conductive slip ring bracket 24. Bolts are used to connect the two sides of the rotating ring 3 and compress the expansion sleeve 1. The inner diameter of the rotating ring 3 is larger than that of the target rotor 1', facilitating installation. Rounded rectangular grooves are cut into both sides of the outer surface of the rotating ring 3 and one end face, intersecting to form a right-angled through-hole for motor wiring. The cylindrical outer surface of the conductive slip ring bracket 24 is fixedly connected to the inner surface of the movable element of the conductive slip ring 26, rotating with the target rotor 1'. Several square grooves are evenly distributed on its cylindrical outer surface to accommodate the heads of the locking bolts. Two tapered through-holes are symmetrically distributed on the end face of the conductive slip ring bracket 24 for motor wiring.

[0034] like Figure 1 、 2As shown, the gear component includes: two sets of mutually meshing planetary gears 5 and ring gears 15, two counterweight plates 19, two counterweight blocks 21, positioning magnet one 10, and positioning magnet two 20. The planetary gears 5 of the gear component and the ultrasonic motor 17 of the rotating component form a hole-shaft fit through the motor shaft 7 and are connected through a key 8 to transmit torque. The center of the planetary gear 5 is provided with an inner hole and a keyway and is mounted on the motor shaft 7. One side of the planetary gear 5 is axially positioned by the shoulder of the motor shaft 7, and the other side is close to the motor shaft end cover 6 to prevent axial sliding. The length of the key 8 is equal to the length of the side surface of the motor shaft 7 and is less than the thickness of the planetary gear 5. The surface length at the shoulder of the motor shaft 7 is greater than the height of the bolt head for fixing the ultrasonic motor 17 to prevent the bolt head from colliding with the gear component when the rotating component rotates.

[0035] like Figure 1 、 2 As shown, the ring gear 15 and the counterweight 21 are fixedly connected to either side of the counterweight plate 19. The end surface of the ring gear 15 is uniformly distributed with several through-holes and positioning blocks, ensuring proper installation and bolted connection to the counterweight plate 19. One end surface of the counterweight plate 19 features a protruding circular ring structure with corresponding threaded holes and positioning grooves. These structures are used to position and secure the ring gear 15, while also preventing friction between the motor shaft end cap 6 and the counterweight plate 19 during operation of the planetary gear 5. The inner surface of the counterweight plate 19 supports the outer ring of the rotating ring bearing 4, while the outer surface supports the inner ring of the stationary ring bearing 13. The rotating ring bearing 4 and the stationary ring bearing 13 are in the same radial plane. The inner surface of the counterweight plate 19 features a stepped hole, and the outer surface features a stepped shaft, positioning the outer ring of the rotating ring bearing 4 and the inner ring of the stationary ring bearing 13 on the same side. The counterweight 21 is a semi-circular ring structure with a through-hole and a positioning block on its surface. The counterweight plate 19 has bolt holes and positioning slots at the same location. The two are fastened together by bolts and properly installed using the positioning blocks. The ring gear 15, counterweight plate 19, and counterweight 21 are fixedly connected and prevent relative movement. The maximum circular diameter of the counterweight 21 is larger than the outer diameter of the counterweight plate 19, and the minimum circular diameter is smaller than the inner diameter of the counterweight plate 19. After being installed on the counterweight plate 19, the excess circular portion provides positioning for the outer ring of the dynamic ring bearing 4 and the other side of the inner ring of the static ring bearing 13. A square hole 211 is opened on one side of the circular ring surface of the counterweight 21. Positioning magnet 10 and positioning magnet 2 20 are respectively installed in the square holes 211 of the two counterweights 21. Positioning magnet 10 is close to the side end cover 11, and positioning magnet 2 20 is close to the side end cover 22.

[0036] like Figure 1 、 2As shown, the stationary parts include: an integrated stationary ring 18 and an air plug frame 28, a side end cover 11, a side end cover 22, an outer retaining ring of the stationary ring bearing 12, an air plug frame cover 14, a positioning Hall element 19, a positioning Hall element 23, and a reference Hall element 16. The stationary ring 18 and the air plug frame 28 are integrally formed and the two are a whole. A peephole is provided on the outer annular surface of the stationary ring 18, which is used to observe the meshing of the planetary gear 5 and the gear ring 15 during installation to prevent installation errors. A square groove and a through hole are provided on the inner annular surface of the stationary ring 18, which are used to install the reference Hall element 16 and route the wiring. Circular grooves are provided on the inner annular surfaces on both sides of the stationary ring 18. The outer ring of the stationary ring bearing 13 fits tightly with the circular groove surface and is positioned through the step hole, and the other side is positioned through the outer retaining ring 12 of the stationary ring bearing. Both end faces of the stationary ring 18 are provided with a number of threaded holes. Through holes are provided in the same locations on the stationary ring bearing outer retaining ring 12, side end cap 11, and side end cap 22. Side end cap 11 is located near the expansion sleeve flange 2. This bolts secure the stationary ring 18's outer retaining ring 12 to one end face of the stationary ring 18. Side end cap 22 is located near the conductive slip ring bracket 24. This bolts secure the stationary ring bearing outer retaining ring 12 to the other end face of the stationary ring 18. The stationary components must remain stationary. Clearances are maintained between the inner surface of side end cap 11 and the outer surface of the expansion sleeve flange 2, and between the inner surface of side end cap 22 and the outer surface of the conductive slip ring bracket 24. This prevents friction between the two during rotation and minimizes environmental impact on the interior of the device. The end surfaces of side cover 11 and side cover 22 have mounting slots along their diameters. Positioning Hall effect element 1 (9) is fixed in the mounting slot of side cover 11, its position corresponding to positioning magnet 10, and is used to detect the position of positioning magnet 10. Positioning Hall effect element 2 (23) is fixed in the mounting slot of side cover 22, its position corresponding to positioning magnet 20, and is used to detect the position of positioning magnet 20. The aviation plug bracket 28 of the stationary ring 18 is rectangular in shape, with symmetrical mounting holes for aviation plugs on its outer surface, which can be used to secure the aviation plugs. The aviation plug bracket cover 14 fits snugly to the left and right sides of the aviation plug bracket 28 and is fixedly connected. The surface of the aviation plug bracket cover 14 has arc-shaped holes for inserting the wires of positioning Hall effect element 1 (9) and positioning Hall effect element 2 (23).

[0037] like Figure 1 、 2As shown, this device is equipped with a reference magnet 27 on the largest outer surface of the dynamic ring 3 and a reference Hall element 16 at a corresponding position on the static ring 18. Reference Hall element 16 can detect the position of reference magnet 27. Positioning magnet 10 and positioning magnet 2 20 are respectively mounted on the counterweights 21 on both sides of the device. Positioning Hall element 1 9 is mounted at a corresponding position on the side end cover 1 11, and positioning Hall element 2 23 is mounted at a corresponding position on the side end cover 2 22. Positioning Hall element 1 9 can detect the position of positioning magnet 10, and positioning Hall element 2 23 can detect the position of positioning magnet 2 20. Reference Hall element 16, positioning Hall element 1 9, and positioning Hall element 2 23 can detect the specific phase of the two counterweight plates 19.

[0038] The motor control wires of the ultrasonic motor 17 are connected to the rotor end of the conductive slip ring 26. The wires of the positioning Hall effect element 1 (9), the positioning Hall effect element 2 (23), the reference Hall effect element 16, and the stator end wires of the conductive slip ring 26 all converge into the aviation plug of the aviation plug bracket 28. The aviation plug bracket cover 14 is tightly attached to the left and right sides of the aviation plug bracket 28 and is fixedly connected. The wires of the ultrasonic motor 17, the reference Hall effect element 16, the positioning Hall effect element 1 (9), and the positioning Hall effect element 2 (23) are not shown in the figure.

[0039] like Figure 6 As shown, the device is tightly mounted on the target rotor 1' through the expansion sleeve 1 and the conductive slip ring brackets 24 on both sides and the expansion sleeve flange 2, and can be installed at any position in the shaft.

[0040] This device needs to be powered on for use, which involves powering the motor and the Hall element. The motor wiring method is: the ultrasonic motor 17 wire passes through the right-angled through-hole of the moving ring 3, and is connected to the conductive slip ring 26 mover through the tapered hole of the conductive slip ring bracket 24. The conductive slip ring 26 stator wire is introduced into the aviation plug of the static ring 18 aviation plug bracket 28 structure through the arc hole of the aviation plug bracket cover 14, and then connected to the external power supply, thereby realizing motor power connection; Hall element power connection: the reference Hall element 16 wire is introduced into the aviation plug bracket 28 structure through the middle wiring hole of the static ring 18, and the positioning Hall element 1 9 and the positioning Hall element 2 23 wires pass through the side end cover 11 and the side end cover 22 mounting grooves respectively, pass through the arc holes of the aviation plug bracket cover 14 on both sides, and are introduced into the aviation plug bracket 28 structure, and are merged into the aviation plug together with the reference Hall element 16 wire, and then are connected to the external power supply, thereby realizing Hall element power connection.

[0041] like Figure 1 、 2 , 5, 7-9, the specific installation process of the entire device is as follows:

[0042] (1) Install two ultrasonic motors 17 symmetrically in the motor mounting holes reserved on the surface of the circular plate structure 29 of the rotating ring 3 and secure them with bolts. Lead the motor control wires through the right-angled through-holes on both sides of the outer circumference of the rotating ring 3. Install the motor shaft 7 on each ultrasonic motor 17, connect the planetary gear 5 to the motor shaft 7 with the key 8, and secure the motor shaft end cap 6 with bolts. A groove is formed on the largest outer circumference of the rotating ring 3, and the reference magnet 27 is embedded in the groove.

[0043] (2) Install the gear ring 15 on one side of the counterweight plate 19, ensure correct installation by matching the positioning square block with the positioning square groove, and fix it with a threaded connection evenly distributed throughout the circle. Then install the dynamic ring bearing 4 and the static ring bearing 13 respectively. The outer ring of the dynamic ring bearing 4 matches the inner surface of the counterweight plate 19, and the inner ring of the static ring bearing 13 matches the outer surface of the counterweight plate 19, which are used to connect the rotating parts and the stationary parts respectively, and ensure that the gear parts are driven independently by the motor normally. On the other side of the counterweight plate 19, correctly install the semi-circular counterweight block 21 through the positioning block and fix it with bolts. The counterweight block 21 positions the dynamic ring bearing 4 and the static ring bearing 13 on the other side. For the counterweight plate 19 on the other side, install the gear ring 15 normally, and then only install the dynamic ring bearing 4.

[0044] (3) Insert the reference Hall element 16 into the square groove on the inner circumference of the stationary ring 18. Insert the gear assembly with the dynamic ring bearing 4 and the static ring bearing 13 into the dynamic ring 3. The inner ring of the dynamic ring bearing 4 is tightly fitted with the dynamic ring 3. Ensure that the planetary gear 5 and the gear ring 15 are properly meshed. Then screw the threaded retaining ring 25 into the threaded shaft of the dynamic ring 3 to axially fix the dynamic ring bearing 4. Next, install the static ring 18 from the other side of the dynamic ring 3. Its inner circumference is tightly fitted with the outer ring of the static ring bearing 13. Install the static ring bearing outer retaining ring 12 to position the static ring bearing 13. Insert the gear component with only the dynamic ring bearing 4 installed on the other side into the dynamic ring 3. During installation, observe the meshing of the planetary gear 5 and the ring gear 15 through the peephole of the static ring 18 to ensure correct meshing. Then install the static ring bearing 13 on the other side. Its outer ring and inner ring are tightly matched with the outer cylindrical surface of the counterweight plate 19 and the inner cylindrical surface of the static ring 18 respectively. Install the counterweight block 21, threaded retaining ring 25 and outer retaining ring 12 of the static ring bearing on the other side in the same way.

[0045] (4) Figure 1 、 2As shown, positioning Hall effect element 1 (9) and positioning Hall effect element 2 (23) are embedded in the mounting slots of side end cap 1 (11) and side end cap 2 (22), respectively. Positioning magnet 1 (10) and positioning magnet 2 (20) are mounted on the surfaces of the counterweights 21 on both sides. Positioning magnet 10 corresponds to positioning Hall effect element 1 (9), and positioning magnet 2 (20) corresponds to positioning Hall effect element 2 (23). Reference Hall effect element 16 detects the position of reference magnet 27, positioning Hall effect element 1 (9) detects the position of positioning magnet 10, and positioning Hall effect element 2 (23) detects the position of positioning magnet 20. Reference Hall effect element 16, positioning Hall effect element 1 (9), and positioning Hall effect element 2 (23) can detect the specific phase of the two counterweight plates 19.

[0046] (5) Install the two expansion sleeves 1 on the inner surface of the two sides of the moving ring 3 respectively, and fix the side end cover 11 and the side end cover 22 on both sides of the stationary ring 18 through the through holes evenly distributed around the circumference to the outer retaining ring 12 of the stationary ring bearing and the stationary ring 18 with bolts. Install the expansion sleeve flange 2, with its end face close to the expansion sleeve 1. Install the conductive slip ring bracket 24 on the other side of the moving ring 3 in the same way, and lead the two motor control lines from the tapered through hole of the conductive slip ring bracket 24. Then install the conductive slip ring 26 and fix it to the conductive slip ring bracket 24. Connect the two motor control lines to the moving end of the conductive slip ring 26, lead the positioning Hall element 1 9 and the positioning Hall element 2 23 wires from the mounting grooves of the side end cover 11 and the side end cover 22 respectively, lead the reference Hall element 16 wires from the through hole, and merge them with the wires of the stator end of the conductive slip ring 26 corresponding to the motor into the aviation plug of the aviation plug bracket 28 structure. Finally, install the aviation plug bracket cover 14. After the installation is complete, debug to ensure that the installation process is correct and the device can start normally.

[0047] In its non-operating state, this device utilizes the static friction between the stator and rotor of the ultrasonic motor 17 to impart a high static holding torque to the ultrasonic motor, thereby securing the counterweight 21 at the target phase and achieving self-locking when power is off. In its operating state, the ultrasonic motor 17 utilizes the inverse piezoelectric effect of piezoelectric materials to excite micro-vibrations in the stator. Friction between the stator and rotor converts these vibrations into rotor rotational motion, driving the planetary gears 5 to rotate and transmitting torque to the ring gear 15. This, in turn, guides the rotation of the counterweight disc 19 to adjust the phase and angle of the counterweight 21, thereby altering the internal mass distribution of the device and forming a compensation vector of appropriate size and direction to offset the imbalance of the target rotor 1' online.

[0048] The ultrasonic motor 17 used in this device, due to its unique drive mechanism, reaches a stable speed within milliseconds after startup. When the motor is shut down, the decay time to zero speed is even shorter. Furthermore, it features high positioning accuracy, excellent speed controllability, and high displacement resolution. It can precisely drive the counterweight 21 to the target phase within a short period of time, suppressing imbalances. It also offers extremely fast response and excellent flexibility.

[0049] During operation, the rotating component rotates with the target rotor 1' via the expansion sleeve 1. When the ultrasonic motor 17 is not operating, the gear component rotates synchronously with the rotating component. When the ultrasonic motor 17 is operating, power is transmitted to the gear component, resulting in a speed difference between the gear component and the rotating component. The stationary component remains stationary throughout the entire process.

[0050] The static ring and dynamic ring structures designed in this device belong to the static and rotating parts of the device respectively. The Hall element installed in the static part can sense the phase of the counterweight plate in real time, forming a counterweight plate positioning solution, solving the problem of the lack of counterweight plate positioning in the existing motor-type online automatic balancing device.

[0051] The ultrasonic motor used in this device has a fast response speed and high positioning accuracy. It can change the internal mass distribution of the device with high precision in a short time, form a compensation vector, and offset the target rotor imbalance online.

[0052] The present invention provides a novel motor-type online automatic balancing device with a positionable counterweight disc. The device adopts a dynamic ring 3 and a static ring 18 structure. Through the reference Hall element 16 preset on the static ring 18, the positioning Hall element 19 on the side end cover 11, and the positioning Hall element 2 23 on the side end cover 22, the positions of the reference magnet 27 on the dynamic ring 3 and the positioning magnet 10 and the positioning magnet 2 20 on the counterweight block at the corresponding positions can be sensed, thereby detecting the specific phases of the two counterweight discs 19, realizing the positioning of the counterweight disc, and realizing the precise distribution of the counterweight block after the counterweight disc is positioned, that is, changing the internal mass distribution of the device, forming a compensation vector with moderate size and direction, offsetting the imbalance of the target rotor 1' online, and improving the dynamic balancing accuracy and operation stability of the target rotor.

[0053] The embodiments described above are merely descriptions of preferred implementations of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A novel motor-operated online automatic balancing device with a positionable counterweight plate, characterized by: The invention comprises a rotating part, a gear part, a stationary part, a conductive slip ring (26), and a connecting bearing which are sleeved outside a target rotor (1'); the connecting bearing comprises two dynamic ring bearings (4) and two stationary ring bearings (13); the rotating part and the gear part are connected via the two dynamic ring bearings (4), and the gear part and the stationary part are connected via the two stationary ring bearings (13); The rotating component comprises a moving ring (3), two ultrasonic motors (17), two expansion sleeves (1), an expansion sleeve flange (2), a motor shaft end cover (6) fixed to the shaft ends of the motor shafts (7) of the two ultrasonic motors (17), a conductive slip ring bracket (24), a threaded retaining ring (25), and a reference magnet (27); The rotating component is interference-fitted with the target rotor (1') through an expansion sleeve (1), the expansion sleeve (1) is installed on both sides of the inner circular surface of the dynamic ring (3), and the expansion sleeve flange (2) and the conductive slip ring bracket (24) are respectively fixed on both sides of the dynamic ring (3) and press the expansion sleeve (1); The dynamic ring (3) is clearance-fitted outside the target rotor (1'); Two ultrasonic motors (17) are centrally symmetrically installed in opposite directions in ultrasonic motor mounting holes (30) of the circular plate structure (29) of the dynamic ring (3); The reference magnet (27) is mounted on the largest outer surface of the moving ring (3); Steps are provided on both sides of the outer circumference of the moving ring (3). Two moving ring bearings (4) are respectively installed on both sides of the moving ring (3) and are respectively located between the moving ring (3) and the two counterweight plates (19). The inner rings of the two moving ring bearings (4) are tightly matched with the outer circumference of the moving ring (3), and one side is positioned by the step provided on the outer circumference of the moving ring (3), and the other side is positioned by the threaded retaining ring (25). The cylindrical outer surface of the conductive slip ring bracket (24) is fixedly connected to the inner surface of the mover of the conductive slip ring (26); The gear component includes two sets of meshing planetary gears (5) and ring gears (15), two counterweight plates (19), two counterweight blocks (21), a first positioning magnet (10), and a second positioning magnet (20); The planetary gear (5) forms a hole-shaft fit with the motor shaft (7) of the ultrasonic motor (17) and is fixedly connected via a key (8); one side of the planetary gear (5) is axially positioned by a shoulder of the motor shaft (7), and the other side is in close contact with the motor shaft end cover (6); The gear ring (15) and the counterweight block (21) are fixedly connected to both sides of the counterweight plate (19); The inner circumference of the counterweight plate (19) presses against the outer ring of the moving ring bearing (4), and the outer circumference of the counterweight plate (19) presses against the inner ring of the stationary ring bearing (13). The moving ring bearing (4) and the stationary ring bearing (13) are in the same radial plane. Positioning magnet 1 (10) and positioning magnet 2 (20) are respectively fixed on two counterweight blocks (21), positioning magnet 1 (10) is arranged close to side end cover 1 (11), and positioning magnet 2 (20) is arranged close to side end cover 2 (22); The stationary component includes an integrated stationary ring (18) and an aerial insert frame (28), the side end cover 1 (11), the side end cover 2 (22), two stationary ring bearing outer retaining rings (12), an aerial insert frame cover (14), a positioning Hall element 1 (9), a positioning Hall element 2 (23), and a reference Hall element (16); The reference Hall element (16) is mounted on the inner surface of the stationary ring (18), and its position corresponds to that of the reference magnet (27), and is used to detect the position of the reference magnet (27); The stationary ring (18) is sleeved outside the dynamic ring (3), and circular grooves are opened on the inner circular surfaces of both sides of the stationary ring (18). The outer ring of the stationary ring bearing (13) is tightly matched with the circular groove surface and positioned through the step hole, and the other side is positioned through the stationary ring bearing outer retaining ring (12); The side end cover 1 (11), one of the stationary ring bearing outer retaining rings (12) and one end face of the stationary ring (18) are fixedly connected by bolts, and the side end cover 2 (22), another stationary ring bearing outer retaining ring (12) and the other end face of the stationary ring (18) are fixedly connected by bolts; The end surfaces of the side end cover 1 (11) and the side end cover 2 (22) are provided with mounting grooves along the diameter direction. The positioning Hall element 1 (9) is fixed in the mounting groove of the side end cover 1 (11), and its position corresponds to the positioning magnet 1 (10), and is used to detect the position of the positioning magnet 1 (10); the positioning Hall element 2 (23) is fixed in the mounting groove of the side end cover 2 (22), and its position corresponds to the positioning magnet 2 (20), and is used to detect the position of the positioning magnet 2 (20); The reference Hall element (16), the positioning Hall element 1 (9), and the positioning Hall element 2 (23) can detect the specific phases of the two counterweight plates (19); The motor control line of the ultrasonic motor (17) is connected to the movable end of the conductive slip ring (26), and the wires of the positioning Hall element 1 (9) and the positioning Hall element 2 (23), the wires of the reference Hall element (16), and the wires of the stator end of the conductive slip ring (26) are all connected to the aviation plug of the aviation plug rack (28). The aviation plug rack cover (14) is tightly attached to the left and right sides of the aviation plug rack (28) and is fixedly connected.

2. The novel motor-operated online automatic balancing device with positionable counterweight plate according to claim 1, characterized in that: The same circular grooves are provided on both sides of the inner circular surface of the dynamic ring (3), the expansion sleeve (1) is installed in the circular grooves, a plurality of threaded holes are provided on both sides of the dynamic ring (3), through holes are provided on the end faces of the expansion sleeve flange (2) and the conductive slip ring bracket (24) and at positions corresponding to the threaded holes, the expansion sleeve flange (2) and the conductive slip ring bracket (24) are connected to both sides of the dynamic ring (3) by bolts and press the expansion sleeve (1).

3. The novel motor-operated online automatic balancing device with positionable counterweight plate according to claim 2, characterized in that: The outer circumference of the dynamic ring (3) is provided with a circular plate structure (29), and ultrasonic motor mounting holes (30) are opened on both sides of the circular plate structure (29). A plurality of threaded holes are provided around each ultrasonic motor mounting hole (30). Two ultrasonic motors (17) are respectively embedded in the two ultrasonic motor mounting holes (30) in opposite directions and fixed with bolts. The center distance of the embedded holes is approximately half the height of the ultrasonic motor (17).

4. The novel motor-operated online automatic balancing device with positionable counterweight plate according to claim 3, characterized in that: Rounded rectangular grooves are provided on both sides of the outer circumference of the movable ring (3) and on one end face, and intersect to form a right-angled through hole for routing the ultrasonic motor. A plurality of square grooves are evenly distributed on the outer circumference of the cylinder of the conductive slip ring bracket (24) for accommodating the heads of the locking bolts connecting the slip ring bracket (24) and the movable ring (3). Two tapered through holes are symmetrically distributed on the end face of the conductive slip ring bracket (24) for routing the ultrasonic motor.

5. The novel motor-operated online automatic balancing device with positionable counterweight plate according to claim 4, characterized in that: The length of the key (8) is equal to the length of the side surface of the motor shaft (7) and is less than the thickness of the planetary gear (5). The length of the surface at the shoulder of the motor shaft (7) is greater than the height of the bolt head for fixing the ultrasonic motor (17).

6. The novel motor-operated online automatic balancing device with positionable counterweight plate according to claim 5, characterized in that: Each of the counterweight blocks (21) is a semicircular ring structure, with a through hole on its surface and a positioning block (212). The counterweight plate (19) has a bolt hole and a positioning groove at the same position. The two are fastened together by bolts and installed through the positioning block (212).

7. The novel motor-operated online automatic balancing device with positionable counterweight plate according to claim 6, characterized in that: The maximum circular diameter of the counterweight block (21) is larger than the outer diameter of the counterweight disc (19), and the minimum circular diameter of the counterweight block (21) is smaller than the inner diameter of the counterweight disc (19).

8. The novel motor-operated online automatic balancing device with positionable counterweight plate according to claim 7, characterized in that: A square hole (211) is opened on one side of the circular ring surface of each counterweight (21), and the positioning magnet 1 (10) and the positioning magnet 2 (20) are respectively installed in the two square holes.

9. The novel motor-operated online automatic balancing device with positionable counterweight plate according to claim 8, characterized in that: A peephole is provided on the outer annular surface of the stationary ring (18) facing the gear meshing position between the planetary gear (5) and the gear ring (15).

10. The novel motor-operated online automatic balancing device with positionable counterweight plate according to claim 9, characterized in that: The shape of the aviation plug rack (28) is rectangular, the outer surface of the aviation plug rack (28) is provided with aviation plug mounting holes symmetrical about the center, and the surface of the aviation plug rack cover (14) is provided with arc holes.

Images