Nested overhung online balancing device

Abstract

The present application relates to the technical fields of rotating machinery main shaft balancing, in particular to a nested external online balancing device, which comprises a shell, a driving mechanism and a counterweight mechanism, the counterweight mechanism comprises an inner ring inner gear ring, an outer ring inner gear ring, an inner ring fixing ring, an outer ring fixing ring, an inner ring counterweight block and an outer ring counterweight block, the inner ring inner gear ring and the outer ring inner gear ring are respectively arranged at the upper and lower ends of the driving mechanism and are independently rotated by the driving mechanism; the inner ring fixing ring is rotatably sleeved on the middle part of the driving mechanism and is connected with the inner ring inner gear ring; the outer ring fixing ring is rotatably sleeved on the inner ring fixing ring and is connected with the outer ring inner gear ring; the inner ring counterweight block is installed on the outer circumferential surface of the inner ring fixing ring, the outer ring counterweight block is installed on the outer circumferential surface of the outer ring fixing ring, and the inner ring counterweight block and the outer ring counterweight block are arranged in a nested manner. The counterweight block is designed in a nested manner, the movement gap of the counterweight block can be eliminated, the absolute position of the counterweight block can be monitored in real time, and the application scenarios with extremely high requirements for stability and transmission rate can be met.

Description

Technical Field

[0001] This invention relates to the field of spindle balancing technology for rotating machinery, and particularly to a nested external online balancing device. Background Technology

[0002] Rotating machinery, as a key power equipment, is widely used in fields such as aero-engines, gas turbines, centrifugal compressors, and high-speed motors. During operation, the unbalanced vibrations caused by uneven mass distribution in the rotor system are a major factor affecting the operational stability and safety of such equipment. Statistics show that rotor imbalance faults account for a high proportion of rotating machinery failures. Traditional dynamic balancing methods typically require stopping the machine for trial weight correction, which is insufficient to address real-time imbalance changes caused by factors such as thermal deformation and media wear during operation. Therefore, devices capable of achieving online automatic balancing without stopping the machine are of great significance for improving the operational accuracy of rotating machinery and reducing maintenance costs.

[0003] In existing online balancing devices, external balancing devices, as a technical solution, are typically used for rotating spindles without internal bores. They are fixed to one end of the rotating spindle using a flange. This solution is characterized by its wide applicability and ease of application. However, existing external balancing devices generally have the following shortcomings:

[0004] (1) The counterweight is usually mounted in pairs (as in the invention patent application with publication number CN121323864A). This method can only balance the force imbalance of the rotating spindle and will introduce additional torque imbalance, which affects the dynamic balance accuracy of the rotating spindle.

[0005] (2) To achieve rapid online dynamic balancing, it is necessary to know the absolute position of the two counterweights. In existing solutions, there is usually no position feedback or only Hall effect sensors or relative position encoders are used to monitor the real-time position of the counterweights. The former can only return the counterweights to the initial origin, and the latter can only monitor the relative motion state of the counterweights. The efficiency is low and the judgment is inaccurate, which results in low speed and accuracy of online dynamic balancing and cannot meet the rapid balancing needs of some industrial fields.

[0006] (3) In terms of the transmission mechanism that drives the counterweight, conventional gear transmission structure is generally adopted. Since there is always backlash in gear meshing, the counterweight will have obvious movement backlash and return error when switching between forward and reverse or changing speed. This transmission backlash seriously affects the position control accuracy and dynamic response stability of the counterweight, and further restricts the adjustment accuracy and speed of online dynamic balancing.

[0007] (4) Complex electromagnetic interference and vibration in industrial sites have a great impact on signal transmission. Existing solutions mainly use mutual inductance wireless communication, which has low transmission rate, poor anti-interference ability, and is greatly affected by the installation location, and cannot meet the needs of some application scenarios for high stability and high transmission rate. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a nested external online balancing device with a compact structure, a nested counterweight design, which can eliminate the gap in the movement of the counterweight, monitor the absolute position of the counterweight in real time, and meet the application scenarios with extremely high requirements for stability and transmission rate.

[0009] The technical solution adopted by this invention to solve its technical problem is: a nested external online balancing device, including a housing and a drive mechanism and a counterweight mechanism disposed inside the housing. The counterweight mechanism includes an inner internal gear ring, an outer internal gear ring, an inner fixed ring, an outer fixed ring, an inner counterweight block, and an outer counterweight block. The inner and outer internal gear rings are respectively disposed at the upper and lower ends of the drive mechanism and are driven to rotate independently by the drive mechanism. The inner fixed ring is rotatably sleeved on the middle of the drive mechanism and connected to the inner internal gear ring. The outer fixed ring is rotatably sleeved on the inner fixed ring and connected to the outer internal gear ring. The inner counterweight block is installed on the outer circumferential surface of the inner fixed ring, and the outer counterweight block is installed on the outer circumferential surface of the outer fixed ring. The inner and outer counterweight blocks are nested together.

[0010] Furthermore, the drive mechanism includes a housing mounted on the bottom wall of the housing and an inner ring drive component, an outer ring drive component, an inner ring transmission assembly, and an outer ring transmission assembly disposed inside the housing. The inner ring drive component and the outer ring drive component are arranged vertically. The output end of the inner ring drive component is connected to the inner ring internal gear ring through the inner ring transmission assembly, and the output end of the outer ring drive component is connected to the outer ring internal gear ring through the outer ring transmission assembly.

[0011] Furthermore, both the inner ring transmission assembly and the outer ring transmission assembly include a primary worm, a primary worm gear double worm shaft, and a secondary worm gear shaft. One end of the primary worm is connected to the output end of the inner ring drive or the outer ring drive, and its other end meshes with the middle of the primary worm gear double worm shaft. The secondary worm gear shaft is respectively disposed at both ends of the primary worm gear double worm shaft. One end of the secondary worm gear shaft meshes with the end of the primary worm gear double worm shaft, and its other end meshes with the inner ring internal gear ring or the outer ring internal gear ring.

[0012] Furthermore, it also includes a position monitoring module disposed inside the housing. The position monitoring module includes an encoder magnetic ring and an encoder reading head. The encoder magnetic ring is respectively installed on the inner ring gear and the outer ring gear. The encoder reading head is installed on the inner wall of the housing and corresponds to the two encoder magnetic rings respectively.

[0013] Furthermore, it also includes a wireless control module located at the top of the housing. The wireless control module includes a housing installed at the center of the top of the housing and a wireless power supply coil, a millimeter-wave signal board, and a control board located inside the housing. The millimeter-wave signal board is located at the center of the wireless power supply coil, and the control board is located below the wireless power supply coil and is electrically connected to the drive mechanism, the encoder reader, and the millimeter-wave signal board, respectively.

[0014] Furthermore, it also includes an acoustic emission detection module disposed inside the housing, the acoustic emission detection module including an acoustic emission sensor and an acoustic emission signal board mounted on the bottom wall of the housing, the acoustic emission sensor and the acoustic emission signal board being symmetrically arranged.

[0015] Furthermore, the shell is a hollow structure with an opening at the top.

[0016] Furthermore, the housing includes a protective section and a flange section, the flange section being mounted at the bottom end of the protective section.

[0017] Furthermore, the outer shell is a hollow structure with an opening at the bottom.

[0018] The beneficial effects of this invention are:

[0019] (1) The present invention installs the inner ring counterweight on the outer circumferential surface of the inner ring fixed ring and the outer ring counterweight on the outer circumferential surface of the outer ring fixed ring. The inner ring counterweight and the outer ring counterweight form a nested arrangement, so that the center of mass of the inner ring counterweight and the outer ring counterweight are located in the same plane of rotation. This eliminates the additional torque caused by the axial separation of the center of mass in the upper and lower mounted structure, avoids the introduction of additional torque imbalance, thereby significantly improving the accuracy of online balancing, and the structure is compact.

[0020] (2) The inner ring transmission component and the outer ring transmission component in this invention enable each first-stage worm gear double worm shaft to simultaneously drive two second-stage worm gear shafts to mesh with the inner ring internal gear ring or the outer ring internal gear ring. While ensuring the double self-locking of the transmission component, a double gear backlash elimination mechanism is formed to ensure that the counterweight can maintain its position lock in the non-driving state, prevent position drift caused by centrifugal force or vibration, and eliminate the motion backlash and return error generated by the counterweight when switching between forward and reverse or changing speed, thereby further improving the position control accuracy and dynamic response stability of the counterweight.

[0021] (3) The present invention uses the encoder magnetic ring to rotate together with the counterweight, and the encoder reading head reads the absolute angle position in real time. This means that the system does not need to perform a zero-return operation after powering on or resetting at any time, and can directly obtain the precise position of the current counterweight, thereby significantly improving the balancing speed and accuracy.

[0022] (4) The present invention uses millimeter wave as a wireless communication scheme. Compared with mutual inductance wireless communication, it has strong anti-interference ability, high transmission rate and little impact from installation location, thus meeting the application scenarios with extremely high requirements for stability and transmission rate. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is an external view of the present invention.

[0025] Figure 2 This is a cross-sectional view of the present invention.

[0026] Figure 3 This is a schematic diagram of the inner ring transmission assembly in this invention.

[0027] Figure 4 This is a cross-sectional view of the wireless control module in this invention.

[0028] In the diagram: 100, housing; 110, protective part; 120, flange; 200, drive mechanism; 210, housing; 220, inner ring drive component; 230, outer ring drive component; 240, inner ring transmission assembly; 241, first-stage worm gear; 242, first-stage worm wheel double worm shaft; 243, second-stage worm wheel gear shaft; 250, outer ring transmission assembly; 300, counterweight mechanism; 310, inner ring internal gear ring; 320, outer ring internal gear ring; 330, inner ring retaining ring. 340. Outer ring fixing ring; 350. Inner ring counterweight; 360. Outer ring counterweight; 400. Position monitoring module; 410. Encoder magnetic ring; 420. Encoder read head; 500. Wireless control module; 510. Housing; 520. Wireless power supply coil; 530. Millimeter wave signal board; 540. Control board; 600. Acoustic emission detection module; 610. Acoustic emission sensor; 620. Acoustic emission signal board; 700. External wireless transmission module. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0030] Example 1

[0031] like Figure 1 and Figure 2As shown, a nested external online balancing device includes a housing 100 and a drive mechanism 200 and a counterweight mechanism 300 disposed inside the housing 100. The counterweight mechanism 300 includes an inner internal gear ring 310, an outer internal gear ring 320, an inner fixed ring 330, an outer fixed ring 340, an inner counterweight block 350, and an outer counterweight block 360. The inner internal gear ring 310 and the outer internal gear ring 320 are respectively disposed at the upper and lower ends of the drive mechanism 200 and are driven by the drive mechanism. The driving mechanism 200 drives independent rotation; the inner ring fixing ring 330 is rotatably sleeved in the middle of the driving mechanism 200 and connected to the inner ring internal gear ring 310; the outer ring fixing ring 340 is rotatably sleeved on the inner ring fixing ring 330 and connected to the outer ring internal gear ring 320; the inner ring counterweight block 350 is installed on the outer circumferential surface of the inner ring fixing ring 330, and the outer ring counterweight block 360 is installed on the outer circumferential surface of the outer ring fixing ring 340, with the inner ring counterweight block 350 and the outer ring counterweight block 360 nested together.

[0032] The inner ring counterweight 350 is installed on the outer circumferential surface of the inner ring fixing ring 330, and the outer ring counterweight 360 is installed on the outer circumferential surface of the outer ring fixing ring 340. The inner ring counterweight 350 and the outer ring counterweight 360 are nested together, so that the centers of mass of the inner ring counterweight 350 and the outer ring counterweight 360 are located in the same plane of rotation. This eliminates the additional torque caused by the axial separation of the centers of mass in the upper and lower mounted structure, avoids the introduction of additional torque imbalance, and thus significantly improves the accuracy of online balancing. The structure is also compact.

[0033] Specifically, the housing 100 is a hollow structure with an open top. Preferably, the housing 100 is separable to facilitate the maintenance or replacement of the internal functional components. Outer ring retaining rings 340 are respectively disposed at the upper and lower ends of the inner ring retaining ring 330. The outer ring retaining ring 340 is rotatably fitted onto the inner ring retaining ring 330 via bearings, allowing the outer ring retaining ring 340 to rotate independently relative to the inner ring retaining ring 330.

[0034] In a feasible embodiment, such as Figure 1 and Figure 2 As shown, the housing 100 includes a protective part 110 and a flange part 120. The flange part 120 is installed at the bottom end of the protective part 110. The protective part 110 is used to protect the internal functional components, and the flange part 120 is used to be fixedly connected to the flange end face of the rotating spindle.

[0035] Specifically, the flange 120 is fastened to the bottom of the protective part 110 by bolts, which facilitates the assembly and separation of the protective part 110 and the flange 120.

[0036] like Figure 2As shown, the drive mechanism 200 includes a housing 210 mounted on the bottom wall of the housing 100 and an inner ring drive member 220, an outer ring drive member 230, an inner ring transmission assembly 240, and an outer ring transmission assembly 250 disposed inside the housing 210. The inner ring drive member 220 and the outer ring drive member 230 are arranged vertically. The output end of the inner ring drive member 220 is connected to the inner ring internal gear ring 310 through the inner ring transmission assembly 240, and the output end of the outer ring drive member 230 is connected to the outer ring internal gear ring 320 through the outer ring transmission assembly 250.

[0037] Specifically, the inner ring fixing ring 330 is rotatably sleeved on the housing 210 via a bearing, ensuring stable rotation of the inner ring fixing ring 330. The inner ring drive component 220 is positioned above the outer ring drive component 230, and both the inner ring drive component 220 and the outer ring drive component 230 are preferably micro stepper motors to achieve precise angle control.

[0038] like Figure 2 and Figure 3 As shown, both the inner ring transmission assembly 240 and the outer ring transmission assembly 250 include a first-stage worm 241, a first-stage worm gear double worm shaft 242, and a second-stage worm gear shaft 243. One end of the first-stage worm 241 is connected to the output end of the inner ring drive member 220 or the outer ring drive member 230, and its other end meshes with the middle part of the first-stage worm gear double worm shaft 242. The second-stage worm gear shaft 243 is respectively disposed at both ends of the first-stage worm gear double worm shaft 242. One end of the second-stage worm gear shaft 243 meshes with the end of the first-stage worm gear double worm shaft 242, and its other end meshes with the inner ring internal gear ring 310 or the outer ring internal gear ring 320.

[0039] The inner ring transmission assembly 240 and the outer ring transmission assembly 250 are configured such that each first-stage worm gear double worm shaft 242 simultaneously drives two second-stage worm gear shafts 243 to mesh with the inner ring internal gear ring 310 or the outer ring internal gear ring 320. While ensuring the double self-locking of the transmission assembly, a double gear backlash elimination mechanism is formed, ensuring that the counterweight can maintain its position lock in the non-drive state, preventing position drift caused by centrifugal force or vibration, and eliminating the motion backlash and return error generated by the counterweight when switching between forward and reverse or changing speed, thereby further improving the position control accuracy and dynamic response stability of the counterweight.

[0040] Specifically, the first-stage worm 241, the first-stage worm gear double worm shaft 242, and the second-stage worm gear shaft 243 are all rotatably connected to the housing 210 to ensure rotational stability.

[0041] Example 2

[0042] like Figure 2As shown, this embodiment adds a position monitoring module 400 to the first embodiment. The position monitoring module 400 is disposed inside the housing 100. The position monitoring module 400 includes an encoder magnetic ring 410 and an encoder read head 420. The encoder magnetic ring 410 is respectively mounted on the inner ring gear 310 and the outer ring gear 320. The encoder read head 420 is mounted on the inner wall of the housing 100 and corresponds to the two encoder magnetic rings 410 respectively.

[0043] The encoder magnetic ring 410 rotates together with the counterweight, and the encoder reading head 420 reads the absolute angular position in real time. This means that the system does not need to perform a zero-return operation after powering on or resetting at any time, and can directly obtain the precise position of the current counterweight, thereby significantly improving the balancing speed and accuracy.

[0044] Specifically, two encoder magnetic rings 410 are respectively disposed on the outer side of the inner ring gear ring 310 and the outer ring gear ring 320. The encoder read head 420 corresponding to the encoder magnetic ring 410 on the inner ring gear ring 310 is installed on the bottom wall of the housing 100, and the encoder read head 420 corresponding to the encoder magnetic ring 410 on the outer ring gear ring 320 is installed on the top wall of the housing 100.

[0045] Example 3

[0046] like Figure 1 and Figure 4 As shown, this embodiment adds a wireless control module 500 to the second embodiment, which is located at the top of the housing 100. The wireless control module 500 includes a housing 510 installed at the center of the top of the housing 100, and a wireless power supply coil 520, a millimeter-wave signal board 530, and a control board 540 disposed inside the housing 510. The wireless power supply coil 520 is used to receive electrical energy transmitted by the external wireless transmitter module 700. The millimeter-wave signal board 530 is located at the center of the wireless power supply coil 520 and is used to realize high-speed, interference-resistant millimeter-wave wireless communication. The control board 540 is located below the wireless power supply coil 520 and is electrically connected to the drive mechanism 200, the encoder reader 420, and the millimeter-wave signal board 530, respectively. It is used to receive control commands and start and stop the drive mechanism 200, and at the same time send the position information fed back by the encoder reader 420 to the upper control system (not shown in the figure) through the millimeter-wave signal board 530.

[0047] This application uses millimeter wave as the wireless communication scheme. Compared with mutual inductance wireless communication, it has strong anti-interference ability, high transmission rate and less impact from installation location, thus meeting the application scenarios with extremely high requirements for stability and transmission rate.

[0048] Specifically, the outer casing 510 is a hollow structure with an opening at the bottom, and the bottom opening of the outer casing 510 is connected to the top opening of the casing 100. The wireless power supply coil 520 and the millimeter-wave signal board 530 are mounted on the top wall of the outer casing 510.

[0049] Example 4

[0050] like Figure 2 As shown, this embodiment adds an acoustic emission detection module 600 to the third embodiment. The acoustic emission detection module 600 is disposed inside the housing 100. The acoustic emission detection module 600 includes an acoustic emission sensor 610 and an acoustic emission signal board 620 installed on the bottom wall of the housing 100. The acoustic emission sensor 610 and the acoustic emission signal board 620 are symmetrically arranged.

[0051] The acoustic emission sensor 610 is used to collect acoustic emission signals in real time during the operation of the rotating spindle. The acoustic emission signal board 620 is used to amplify, filter and perform preliminary processing on the collected signals, and transmit the processed data to the upper control system through the wireless control module 500.

[0052] During operation, the entire device is fixedly mounted on the rotating spindle via flange 120. The external wireless transmitter module 700 is mounted on a stationary component near the rotating spindle. It establishes a high-speed wireless communication link with the millimeter-wave signal board 530 inside the device via millimeter-wave frequency band, and provides working power to the entire device via wireless power supply coil 520.

[0053] When unbalanced vibration occurs during the rotation of the main spindle, the upper control system calculates the required adjustment angle position of the counterweight based on the vibration signal. Control commands are transmitted to the control board 540 via millimeter-wave wireless communication. The control board 540 activates the inner ring drive 220 and / or the outer ring drive 230. The inner ring drive 220 and / or the outer ring drive 230 drive the inner ring gear 310 and / or the outer ring gear 320 to rotate via a first-stage worm 241, a first-stage worm gear double worm shaft 242, and a second-stage worm gear shaft 243. This, in turn, drives the inner ring fixing ring 330 (synchronously driving the inner ring counterweight 350) and / or the outer ring fixing ring 340 (synchronously driving the outer ring counterweight 360) to rotate to the target angle position. Throughout the adjustment process, the encoder magnetic ring 410 rotates with the counterweight, and the encoder reading head 420 reads the absolute angle position in real time and feeds it back to the control board 540, forming a closed-loop control. Meanwhile, the acoustic emission sensor 610 continuously monitors the operating status of the rotary spindle. When an abnormal acoustic emission signal is detected, an early warning can be triggered to realize fault warning and monitoring of the rotary spindle tool setting process.

[0054] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A nested external online balancing device, comprising a housing (100) and a drive mechanism (200) and a counterweight mechanism (300) disposed inside the housing (100), characterized in that: The counterweight mechanism (300) includes an inner internal gear ring (310), an outer internal gear ring (320), an inner ring fixing ring (330), an outer ring fixing ring (340), an inner counterweight block (350), and an outer counterweight block (360). The inner internal gear ring (310) and the outer internal gear ring (320) are respectively disposed at the upper and lower ends of the drive mechanism (200) and are driven to rotate independently by the drive mechanism (200). The inner ring fixing ring (330) is rotatably sleeved on the drive mechanism. The moving mechanism (200) is located in the middle and connected to the inner ring gear (310); the outer ring fixing ring (340) is rotatably sleeved on the inner ring fixing ring (330) and connected to the outer ring gear (320); the inner ring counterweight (350) is installed on the outer circumferential surface of the inner ring fixing ring (330), and the outer ring counterweight (360) is installed on the outer circumferential surface of the outer ring fixing ring (340). The inner ring counterweight (350) and the outer ring counterweight (360) are nested together.

2. The nested external online balancing device according to claim 1, characterized in that: The drive mechanism (200) includes a housing (210) installed on the bottom wall of the housing (100) and an inner ring drive (220), an outer ring drive (230), an inner ring transmission assembly (240) and an outer ring transmission assembly (250) disposed inside the housing (210). The inner ring drive (220) and the outer ring drive (230) are arranged vertically. The output end of the inner ring drive (220) is connected to the inner ring internal gear ring (310) through the inner ring transmission assembly (240). The output end of the outer ring drive (230) is connected to the outer ring internal gear ring (320) through the outer ring transmission assembly (250).

3. The nested external online balancing device according to claim 2, characterized in that: Both the inner ring drive assembly (240) and the outer ring drive assembly (250) include a first-stage worm (241), a first-stage worm gear double worm shaft (242), and a second-stage worm gear shaft (243). One end of the first-stage worm (241) is connected to the output end of the inner ring drive (220) or the outer ring drive (230), and its other end meshes with the middle part of the first-stage worm gear double worm shaft (242). The second-stage worm gear shaft (243) is respectively disposed at both ends of the first-stage worm gear double worm shaft (242). One end of the second-stage worm gear shaft (243) meshes with the end of the first-stage worm gear double worm shaft (242), and its other end meshes with the inner ring internal gear ring (310) or the outer ring internal gear ring (320).

4. The nested external online balancing device according to claim 1, characterized in that: It also includes a position monitoring module (400) disposed inside the housing (100). The position monitoring module (400) includes an encoder magnetic ring (410) and an encoder reading head (420). The encoder magnetic ring (410) is respectively installed on the inner ring gear (310) and the outer ring gear (320). The encoder reading head (420) is installed on the inner wall of the housing (100) and corresponds to the two encoder magnetic rings (410) respectively.

5. The nested external online balancing device according to claim 4, characterized in that: It also includes a wireless control module (500) disposed at the top of the housing (100). The wireless control module (500) includes a housing (510) installed at the center of the top of the housing (100) and a wireless power supply coil (520), a millimeter wave signal board (530) and a control board (540) disposed inside the housing (510). The millimeter wave signal board (530) is disposed at the center of the wireless power supply coil (520), and the control board (540) is disposed below the wireless power supply coil (520) and is electrically connected to the drive mechanism (200), the encoder reader (420) and the millimeter wave signal board (530) respectively.

6. The nested external online balancing device according to claim 1, characterized in that: It also includes an acoustic emission detection module (600) disposed inside the housing (100). The acoustic emission detection module (600) includes an acoustic emission sensor (610) and an acoustic emission signal board (620) installed on the bottom wall of the housing (100). The acoustic emission sensor (610) and the acoustic emission signal board (620) are symmetrically arranged.

7. The nested external online balancing device according to claim 1, characterized in that: The shell (100) is a hollow structure with an opening at the top.

8. The nested external online balancing device according to claim 1, characterized in that: The housing (100) includes a protective section (110) and a flange section (120), the flange section (120) being mounted on the bottom end of the protective section (110).

9. The nested external online balancing device according to claim 5, characterized in that: The outer shell (510) is a hollow structure with an opening at the bottom.

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