Low-noise motor rotor dynamic balance detection device

Abstract

The invention discloses a low-noise motor rotor dynamic balance detection device, and particularly relates to the technical field of automobile part detection, the low-noise motor rotor dynamic balance detection device comprises a detection table and supporting plates arranged at the upper end of the detection table in a bilateral symmetry manner, and the inner surfaces of the two supporting plates are jointly provided with rotor fixing structures distributed in a bilateral symmetry manner; driving structures used for driving a motor rotor to rotate are arranged at the upper end of the detection table in a bilateral symmetry mode, and an eccentricity detection structure used for detecting the rotation eccentricity and the vibration frequency of the rotor is arranged in the middle of the upper end of the detection table. Rotor noise is effectively isolated through the shielding cover to ensure detection accuracy, automatic centering and stable clamping of the rotor are achieved through cooperation of the clamping assembly and the driving assembly of the rotor fixing structure, and accurate positioning and low-friction driving of the rotor are completed through cooperation of the positioning assembly and the locking assembly of the driving structure. Vibration and eccentricity data are acquired in a multi-dimensional manner by combining a contact wheel of an eccentricity detection structure and a sensor array, and high-precision comprehensive detection of dynamic balance of the rotor is finally realized.

Description

Technical Field

[0001] This invention relates to the field of automotive parts testing technology, and in particular to a low-noise motor rotor dynamic balancing testing device. Background Technology

[0002] The field of automotive parts testing technology encompasses various technical means for inspecting and measuring the performance and quality of various automotive components. Its core content lies in ensuring that components meet design standards and usage requirements through specialized equipment and systematic testing methods. This technical field systematically covers multiple testing aspects, from component material properties and structural strength to operational functions, including but not limited to dimensional measurement, fatigue testing, dynamic performance analysis, and noise and vibration control. Among these, the dynamic balance performance testing of the motor rotor, as a key component, is a crucial step in ensuring the smooth and low-noise operation of the automotive drive system.

[0003] The low-noise motor rotor dynamic balancing testing device is a specialized piece of equipment used to measure and correct the imbalance caused by uneven mass distribution during motor rotor rotation. This device addresses the vibration and noise problems caused by imbalance during high-speed rotor rotation. It uses a support frame and drive assembly to rotate the rotor, collects vibration signals from the rotor's rotation using sensors, identifies the imbalance location based on vibration amplitude and phase data, and performs balance correction at specific locations on the rotor by adding or removing mass blocks.

[0004] Existing technologies use a support frame and drive components to rotate the rotor, relying on sensors to collect vibration signals and using additional mass blocks for balance correction. This method is prone to introducing additional vibrations due to insufficient rotor alignment accuracy under high-speed rotation conditions. The lack of clamping stability leads to slight rotor displacement. Vibration signal acquisition is affected by environmental noise. Its operation mode relies on step-by-step operation and manual intervention, resulting in deviations in the identification position of imbalance. The correction process is repeated, limiting detection efficiency. The overall dynamic balance accuracy is difficult to meet the stringent requirements of low-noise motors. Summary of the Invention

[0005] The main objective of this invention is to provide a low-noise motor rotor dynamic balancing testing device, which can effectively solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A low-noise motor rotor dynamic balancing testing device includes a testing platform, a shielding cover disposed on the upper part of the testing platform, and support plates symmetrically disposed on the upper part of the testing platform. The inner surfaces of the two support plates are jointly provided with rotor fixing structures symmetrically distributed on the left and right. The upper part of the testing platform is provided with drive structures for driving the motor rotor to rotate symmetrically on the left and right. The middle part of the upper part of the testing platform is provided with an eccentricity detection structure for detecting the rotor rotation eccentricity and vibration frequency.

[0007] Preferably, the eccentricity detection structure includes a mounting base one installed at the upper middle part. The upper end of the mounting base one is symmetrically connected to contact wheels for positioning contact via electric telescopic rods. Contact sensors are provided on the outer surfaces of both contact wheels. A sensor array is fixedly connected to the upper end of the mounting base one. Several detection wheels that fit against the outer surface of the rotor core are arranged in an array at the upper end of the sensor array. Several detection wheels are slidably connected to the sensor array via magnetic connecting posts. An electromagnetic sensor for detecting the vertical displacement of the magnetic connecting posts is provided in the sensor array.

[0008] Preferably, the driving structure includes a support block installed on the upper end of the testing platform. The upper end of the support block has an arc-shaped groove, and a drive wheel driven by a motor is rotatably connected to the inner surface of the arc-shaped groove. A positioning component is rotatably connected to the rear side of the upper end of the support block. A buffer groove for accommodating the positioning component is provided on the front side of the upper end of the support block. A locking component for engaging the positioning component is provided on the inner surface of the buffer groove and the front end of the support block.

[0009] Preferably, the locking assembly includes a knob rotatably connected to the front end of the support block. Cables are symmetrically wound around the outer surface of the central shaft of the knob. The ends of the two cables away from the knob are fixedly connected to sliding posts that are slidably connected to the inner cavity of the support block. Spring limiting rings that are fixedly connected to the inner cavity of the support block are provided on the outer surfaces of the two sliding posts. The two sliding posts extend through the inner cavities of adjacent support blocks to the inner surface of the buffer groove and are fastened to the positioning assembly.

[0010] Preferably, the positioning component includes an arc-shaped block rotatably connected to the upper rear side of the support block via a hinge seat. A spring plate is symmetrically slidably connected to the inner cavity of the arc-shaped block. A connecting rod is fixedly connected to the lower end of each of the two spring plates. Each of the two connecting rods extends through the inner cavity of the arc-shaped block to the inner arc surface of the arc-shaped block and is rotatably connected to a roller that fits against the outer surface of the rotor's central shaft. A locking hole communicating with the right end is opened on the front side of the left end of the arc-shaped block. The locking hole is adapted to the sliding column. When the locking hole is inside the buffer groove, the sliding column slides into the locking hole under the action of the spring limiting ring.

[0011] Preferably, the rotor fixing structure includes an I-shaped ring with I-shaped grooves on its outer surface, and damping rods that are fixedly connected to the support plate symmetrically at one end of the I-shaped ring near the support plate. Limiting grooves that communicate with the outer I-shaped grooves are distributed in a ring on the inner surface of the I-shaped ring. A plurality of clamping components for fixing the rotor central shaft are distributed in a ring on the inner surface of the I-shaped ring. The plurality of clamping components are slidably connected to the inner surface of adjacent limiting grooves. A driving component for driving the clamping components to clamp the rotor central shaft is provided on the outer surface of the I-shaped ring.

[0012] Preferably, the driving assembly includes a rotating ring sleeved on the outer surface of the I-shaped ring, and a plurality of wedge-shaped blocks are fixedly connected in a ring on the inner surface of the rotating ring. The outer surface of the wedge-shaped blocks is slidably connected to the inner surface of the I-shaped groove of the I-shaped ring and fits against the clamping assembly. When the rotating ring rotates, the wedge-shaped blocks slide inside the I-shaped ring and drive the clamping assembly to clamp or release the rotor. The inner surface of the support plate is provided with a positioning component that drives the driving assembly to rotate.

[0013] Preferably, the clamping assembly includes a hollow rod slidably connected to the inner surface of the limiting groove. A return spring is provided on the inner surface of the hollow rod and fixedly connected to the inner arc surface of the limiting groove. The side of the hollow rod located in the I-shaped groove of the I-shaped ring is in close contact with the wedge surface of the adjacent wedge block. A second mounting base is fixedly connected to the side of the hollow rod located on the inner surface of the I-shaped ring. Elastic arms are fixedly connected to both the left and right sides of the second mounting base. The two elastic arms are rotatably connected to the connecting rod rotatably connected to the inner surface of the I-shaped ring on the side near the inner surface of the I-shaped ring.

[0014] Preferably, the clamping assembly further includes a movable block that is slidably connected to the inner surface of the mounting base two. A spring plate two that is fixedly connected to the inner surface of the mounting base two is slidably connected to the inner surface of the movable block. The movable block is always in contact with the outer surface of the rotor central shaft under the action of the spring plate two. A vibration sensor is provided on the lower side of the movable block.

[0015] Preferably, the positioning component includes a buffer plate rotatably mounted on the side of the support plate away from the eccentric detection structure. A central rod is fixedly connected to the side of the buffer plate near the eccentric detection structure and slidably connected to the inner surface of the support plate. A contact plate for abutting against the rotor central shaft is fixedly connected to the side of the central rod away from the buffer plate. A spiral groove is annularly distributed on the outer surface of the central rod. A driven ring is rotatably connected to the outer surface of the central rod and slidably connected to the spiral groove. A transmission ring is provided on the outer surface of the driven ring through a fixed rod and is drively connected to the rotating ring. When the contact plate contacts the stator, the central rod moves away from the eccentric detection structure under the action of the contact plate and drives the driven ring and transmission ring to rotate synchronously through the spiral groove, thereby driving the rotating ring to rotate.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention effectively isolates rotor noise through a shielding cover to ensure detection accuracy. It utilizes the clamping components of the rotor fixing structure and the drive components to achieve automatic rotor centering and stable clamping. The positioning and locking components of the drive structure work together to achieve precise rotor positioning and low-friction drive. Combined with the contact wheel of the eccentric detection structure and the sensor array, it collects vibration and eccentricity data from multiple dimensions, and finally achieves high-precision comprehensive detection of rotor dynamic balance.

[0017] 2. This invention provides stable rotational power through the support block and drive wheel of the drive structure. The arc-shaped block of the positioning component, together with the spring plate and roller, achieves precise positioning and low-friction support of the rotor's central shaft. With the help of the knob cable and sliding column of the locking component, the locking ring automatically locks into the locking hole, ensuring that the arc-shaped block locks quickly and reliably after engagement. The entire structure works in concert to achieve high stability and ease of operation during rotor drive, effectively ensuring the benchmark conditions for dynamic balance testing.

[0018] 3. This invention uses the I-shaped ring and damping rod of the rotor fixing structure to form a stable support foundation. The rotating ring and wedge block of the drive component convert the rotational motion into the linear clamping force of the clamping component. The hollow rod and return spring of the clamping component enable rapid reset. The floating design of the elastic arm and movable block of the mounting seat adaptively fits the rotor's central axis. Combined with the buffer plate of the positioning component and the screw transmission mechanism, the rotor placement action is automatically converted into synchronous clamping force. Finally, the rotor is quickly and automatically centered and flexibly and stably clamped, effectively improving the detection stability and operation efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the shielding cover of the present invention; Figure 3 This is a schematic diagram of the eccentricity detection structure of the present invention; Figure 4 This is a schematic diagram of the driving structure of the present invention; Figure 5 This is a schematic diagram of the positioning component and locking component of the present invention; Figure 6 This is a schematic diagram of the rotor fixing structure of the present invention; Figure 7 This is a schematic cross-sectional view of the rotating ring of the present invention; Figure 8 This is a schematic diagram of the clamping assembly of the present invention; Figure 9 For the present invention Figure 8 Enlarged schematic diagram of a local structure at point A; Figure 10 This is a schematic diagram of the structure of the driving component of the present invention.

[0020] In the diagram: 1. Detection platform; 2. Shielding cover; 3. Support plate; 4. Drive structure; 41. Support block; 411. Buffer groove; 42. Positioning component; 421. Arc-shaped block; 422. Locking hole; 423. Spring plate one; 424. Connecting rod; 425. Roller; 43. Locking component; 431. Knob; 432. Sliding column; 433. Spring limit ring; 434. Cable; 44. Drive wheel; 5. Eccentric detection structure; 51. Mounting base one; 52. Contact wheel; 53. Sensor array; 54. Detection wheel 6. Rotor fixing structure; 61. Drive assembly; 611. Rotating ring; 612. Wedge block; 613. Positioning component; 6131. ​​Buffer plate; 6132. Contact plate; 6133. Center rod; 6134. Driven ring; 6135. Transmission ring; 62. I-beam ring; 621. Damping rod; 622. Limiting groove; 63. Clamping assembly; 631. Hollow rod; 632. Mounting base two; 633. Connecting rod; 634. Elastic arm; 635. Movable block; 636. Spring plate two; 637. Return spring. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0022] Example 1: A low-noise motor rotor dynamic balancing testing device includes a testing platform 1 and a shield 2 disposed on the upper end of the testing platform 1. The shield 2 can effectively isolate the air noise and mechanical vibration sound waves generated by the rotor during high-speed rotation, avoiding interference from the external environment on the testing data, thereby ensuring the accuracy and reliability of the testing results. Support plates 3 are symmetrically arranged on the upper end of the testing platform 1. Rotor fixing structures 6 are symmetrically distributed on the inner surfaces of the two support plates 3. The rotor fixing structures 6 are used to firmly clamp the rotor central shaft during the testing process to prevent it from shifting or loosening. Drive structures 4 are symmetrically arranged on the upper end of the testing platform 1. The drive structures 4 drive the drive wheels 44 to rotate through the motor, thereby driving the rotor central shaft to rotate synchronously, providing stable rotational power for dynamic balancing testing. An eccentric detection structure 5 is installed in the middle of the upper end of the testing platform 1. The eccentric detection structure 5 collects the vibration frequency and eccentric displacement signals of the rotor in real time through the contact wheel 52 and multiple detection wheels 54 on the sensor array 53, realizing multi-dimensional high-precision detection of the rotor dynamic balance state.

[0023] The eccentricity detection structure 5 includes a mounting base 51 installed at the middle of the upper end of the detection platform 1. The upper end of the mounting base 51 is symmetrically connected to contact wheels 52 via electric telescopic rods. The electric telescopic rods can precisely control the lateral movement distance of the contact wheels 52, allowing them to adapt to rotors of different diameters and ensuring a tight fit between the contact wheels 52 and the rotor surface. Contact sensors are mounted on the outer surfaces of both contact wheels 52 to sense vibration signals on the rotor surface in real time. A sensor array 53 is fixedly connected to the upper end of the mounting base 51. Multiple detection wheels 54 are arrayed on the upper end of the sensor array 53. These detection wheels 54 are slidably connected to the sensor array 53 via magnetic connecting posts. The magnetic connecting posts use magnetic attraction to keep the detection wheels 54 always in close contact with the outer surface of the rotor core. Simultaneously, their sliding structure can flexibly adapt to the slight vertical displacement generated during rotor rotation. The sensor array 53 integrates electromagnetic sensors that can accurately detect the displacement of the magnetic connecting posts, thereby determining the degree of rotor eccentricity. The array layout of multiple detection wheels 54 comprehensively covers the rotor core surface, significantly improving the comprehensiveness and accuracy of eccentricity detection.

[0024] In the operation of this embodiment, the shielding cover 2 effectively isolates rotor noise to ensure detection accuracy. The clamping component 63 of the rotor fixing structure 6 works in conjunction with the driving component 61 to achieve automatic rotor centering and stable clamping. The positioning component 42 and locking component 43 of the driving structure 4 work together to complete the precise positioning and low-friction driving of the rotor. The contact wheel 52 of the eccentricity detection structure 5 and the sensor array 53 collect vibration and eccentricity data from multiple dimensions, and finally achieve high-precision comprehensive detection of rotor dynamic balance.

[0025] In Example 2, based on Example 1, the support block 41 and drive wheel 44 of the drive structure 4 provide stable rotational power. The arc-shaped block 421 of the positioning component 42, together with the spring plate 423 and roller 425, achieves precise positioning and low-friction support of the rotor center shaft. With the help of the knob 431, cable 434 and sliding column 432 of the locking component 43, they automatically lock into the locking hole 422 under the action of the spring limit ring 433, ensuring that the arc-shaped block 421 is locked quickly and reliably after being engaged. The entire structure works together to achieve high stability and convenient operation during the rotor drive process, effectively ensuring the benchmark conditions for dynamic balance testing.

[0026] The drive structure 4 includes a support block 41 fixedly installed on the upper end of the testing table 1. The upper end of the support block 41 has an arc-shaped groove, and a drive wheel 44 is rotatably connected to the inner surface of the arc-shaped groove. The drive wheel 44 is driven by a motor to rotate, thereby driving the rotor central shaft placed in the arc-shaped groove to rotate synchronously. The upper rear side of the support block 41 is rotatably connected to a positioning component 42 through a hinge seat. The upper front side of the support block 41 has a buffer groove 411 for accommodating the locking part of the positioning component 42. The inner surface of the buffer groove 411 and the front end of the support block 41 are jointly provided with a locking component 43. The locking component 43 is used to quickly lock the position of the positioning component 42 after it is engaged, ensuring that the rotor central shaft remains stable and does not disengage during rotation.

[0027] The locking assembly 43 includes a knob 431 rotatably connected to the front end of the support block 41. Cables 434 are symmetrically wound around the outer surface of the central shaft of the knob 431. Sliding pins 432 are fixedly connected to the ends of the two cables 434 away from the knob 431. The sliding pins 432 are slidably connected to the inner cavity of the support block 41 and are provided with spring limiting rings 433 on their outer surfaces. The spring limiting rings 433 provide elastic restoring force so that the sliding pins 432 maintain a tendency towards the buffer groove 411 in their natural state. When the knob 431 is rotated, the cables 434 are tightened or loosened, causing the sliding pins 432 to slide in the inner cavity of the support block 41, thereby achieving engagement or disengagement with the locking hole 422 of the positioning assembly 42. This design makes the locking operation simple, quick and reliable.

[0028] Positioning assembly 42 includes an arc-shaped block 421 rotatably connected to the upper rear side of support block 41 via a hinge seat. Spring plates 423 are symmetrically slidably connected to the inner cavity of the arc-shaped block 421. Connecting rods 424 are fixedly connected to the lower ends of both spring plates 423. The connecting rods 424 penetrate the inner cavity of the arc-shaped block 421 and extend to the inner arc surface of the arc-shaped block 421, with rollers 425 rotatably connected to their ends. The rollers 425 are tightly fitted against the rotor center under the elastic pressure of the spring plates 423. The outer surface of the shaft ensures the positioning accuracy of the rotor center shaft and greatly reduces the frictional resistance when the rotor rotates. A locking hole 422 is provided on the front side of the left end of the arc block 421. When the arc block 421 rotates around the hinge seat and engages above the arc groove of the support block 41, the locking hole 422 is aligned with the buffer groove 411. At this time, the sliding column 432 automatically slides into the locking hole 422 under the elastic action of the spring limit ring 433 to complete the locking. This structure realizes the rapid positioning and reliable fixation of the rotor center shaft.

[0029] In Example 3, based on Example 2, the rotor fixing structure 6 uses the I-shaped ring 62 and damping rod 621 to form a stable support base. The rotational motion is converted into the linear clamping force of the clamping component 63 by the rotating ring 611 and wedge block 612 of the drive component 61. The hollow rod 631 and return spring 637 of the clamping component 63 are used to achieve rapid reset. The floating design of the elastic arm 634 and movable block 635 of the mounting base 2 632 adaptively fits the rotor center axis. Combined with the buffer plate 6131 of the positioning component 613 and the screw transmission mechanism, the rotor placement action is automatically converted into synchronous clamping force. Finally, the rotor is quickly and automatically centered and flexibly and stably clamped, which effectively improves the detection stability and operation efficiency.

[0030] The rotor fixing structure 6 includes an I-shaped ring 62 with I-shaped grooves on its outer surface. A damping rod 621 is symmetrically fixed to one end of the I-shaped ring 62 near the support plate 3. The damping rod 621 is fixedly connected to the support plate 3 to effectively absorb and buffer the impact force generated during rotor placement and clamping, thereby improving the stability of the entire fixing system. Several limiting grooves 622 are distributed in a ring on the inner surface of the I-shaped ring 62. These limiting grooves 622 are connected to the outer I-shaped grooves. Several clamping components 63 are distributed in a ring on the inner surface of the I-shaped ring 62. Each clamping component 63 is slidably connected to the inner surface of the adjacent limiting groove 622. A driving component 61 is provided on the outer surface of the I-shaped ring 62. The driving component 61 drives all clamping components 63 to move synchronously toward the center of the I-shaped ring 62 through the cooperation of the rotating ring 611 and the wedge block 612, thereby clamping the rotor central shaft.

[0031] The drive assembly 61 includes a rotating ring 611 sleeved on the outer surface of the I-shaped ring 62. Several wedge-shaped blocks 612 are fixedly connected in a ring on the inner surface of the rotating ring 611. The outer surface of the wedge-shaped blocks 612 is slidably connected to the inner surface of the I-shaped groove of the I-shaped ring 62 and fits against the end of the hollow rod 631 of the clamping assembly 63. When the rotating ring 611 rotates, the wedge-shaped blocks 612 slide along the I-shaped groove and push the hollow rod 631 along the limiting groove 622 to move inward to the inside of the I-shaped ring 62, thereby driving the clamping assembly 63 to clamp the rotor center shaft. The inner surface of the support plate 3 is provided with a positioning component 613. The positioning component 613 drives the rotating ring 611 to rotate through the transmission action of the center rod 6133 and the transmission ring 6135, realizing automatic triggering and precise control of the clamping action.

[0032] The clamping assembly 63 includes a hollow rod 631 that is slidably connected to the inner surface of the limiting groove 622. A return spring 637 is provided on the inner surface of the hollow rod 631. One end of the return spring 637 is connected to the inner surface of the hollow rod 631, and the other end is fixedly connected to the inner arc surface of the limiting groove 622. When the clamping force is released, the return spring 637 provides a restoring force to make the hollow rod 631 quickly return to its initial position for easy rotor removal. The hollow rod 631 is located on one side of the I-shaped groove of the I-shaped ring 62 and adjacent to the wedge block 61. The wedge-shaped surface of 2 is tightly attached, and the hollow rod 631 is fixedly connected to the mounting base 632 on one side of the inner surface of the I-shaped ring 62. The mounting base 632 is fixedly connected to the left and right sides of both sides. The two elastic arms 634 are rotatably connected to the inner surface of the I-shaped ring 62 through the connecting rod 633 on the side of each elastic arm 634 near the inner surface of the I-shaped ring 62. The cooperation between the elastic arm 634 and the connecting rod 633 enables the mounting base 632 to adaptively adjust its angle during movement to ensure alignment with the rotor's central shaft.

[0033] The clamping assembly 63 also includes a movable block 635 that is slidably connected to the inner surface of the mounting base 632. A spring plate 636 is slidably connected to the inner surface of the movable block 635. The spring plate 636 is fixedly connected to the inner surface of the mounting base 632 and provides continuous elastic pressure to the movable block 635, so that the movable block 635 is always tightly attached to the outer surface of the rotor central shaft. A vibration sensor is installed on the lower side of the movable block 635. The vibration sensor can collect the initial vibration signal in real time after the rotor is fixed to provide reference data for subsequent dynamic balance testing. The floating design of the movable block 635 combined with the elastic effect of the spring plate 636 makes the clamping force evenly distributed and can adapt to the slight irregularities of the rotor journal.

[0034] The positioning component 613 includes a buffer plate 6131 rotatably mounted on the side of the support plate 3 away from the eccentric detection structure 5. The buffer plate 6131 can effectively alleviate the impact force on the center rod 6133 when the rotor is placed, protecting the internal components from damage. The center rod 6133 is fixedly connected to the side of the buffer plate 6131 near the eccentric detection structure 5. The center rod 6133 is slidably connected to the inner surface of the support plate 3 and a contact plate 6132 is fixed at its end. The contact plate 6132 is used to contact the end of the rotor's central shaft. The outer surface of the center rod 6133 is provided with helical grooves distributed in an annular pattern, and a driven ring 6134 is rotatably connected to the outer surface of the center rod 6133. The inner surface of the driven ring 6134 slides in fit with the helical groove, and the outer surface of the driven ring 6134 is connected to the transmission ring 6135 through a fixed rod. The transmission ring 6135 is connected to the rotating ring 611 in a transmission connection. When the rotor central shaft contacts the contact plate 6132, it pushes the central rod 6133 to move away from the eccentric detection structure 5. The helical groove on the outer surface of the central rod 6133 drives the driven ring 6134 to rotate. The driven ring 6134 drives the transmission ring 6135 to rotate synchronously through the fixed rod, which in turn drives the rotating ring 611 to rotate on the outer surface of the I-shaped ring 62. Finally, it drives all the clamping components 63 to move synchronously to achieve automatic centering and stable clamping of the rotor.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A low-noise motor rotor dynamic balancing testing device, comprising a testing platform (1), a shielding cover (2) disposed on the upper end of the testing platform (1), and support plates (3) symmetrically disposed on the upper end of the testing platform (1), characterized in that: The inner surfaces of the two support plates (3) are provided with rotor fixing structures (6) that are symmetrically distributed on the left and right. The upper end of the test platform (1) is provided with a drive structure (4) for driving the motor rotor to rotate. The middle part of the upper end of the test platform (1) is provided with an eccentricity detection structure (5) for detecting the rotor rotation eccentricity and vibration frequency.

2. The low-noise motor rotor dynamic balancing testing device according to claim 1, characterized in that: The eccentric detection structure (5) includes a mounting base (51) installed in the middle of the upper end. The upper end of the mounting base (51) is symmetrically connected to contact wheels (52) for positioning contact via electric telescopic rods. Contact sensors are provided on the outer surfaces of the two contact wheels (52). A sensor array (53) is fixedly connected to the upper end of the mounting base (51). Several detection wheels (54) that fit the outer surface of the rotor core are arranged in an array on the upper end of the sensor array (53). Several detection wheels (54) are slidably connected to the sensor array (53) via magnetic connecting columns. An electromagnetic sensor for detecting the vertical displacement of the magnetic connecting columns is provided in the sensor array (53).

3. The low-noise motor rotor dynamic balancing testing device according to claim 1, characterized in that: The drive structure (4) includes a support block (41) installed on the upper end of the testing table (1). The upper end of the support block (41) has an arc-shaped groove, and the inner surface of the arc-shaped groove is rotatably connected to a drive wheel (44) driven by a motor. The rear side of the upper end of the support block (41) is rotatably connected to a positioning component (42). The front side of the upper end of the support block (41) has a buffer groove (411) for accommodating the positioning component (42). The inner surface of the buffer groove (411) and the front end of the support block (41) are provided with a locking component (43) for engaging the positioning component (42).

4. The low-noise motor rotor dynamic balancing testing device according to claim 3, characterized in that: The locking assembly (43) includes a knob (431) rotatably connected to the front end of the support block (41). Cables (434) are symmetrically wound around the outer surface of the central shaft of the knob (431). The ends of the two cables (434) away from the knob (431) are fixedly connected to sliding posts (432) that are slidably connected to the inner cavity of the support block (41). The outer surfaces of the two sliding posts (432) are provided with spring limiting rings (433) that are fixedly connected to the inner cavity of the support block (41). The two sliding posts (432) extend through the inner cavity of the adjacent support block (41) to the inner surface of the buffer groove (411) and are fastened to the positioning assembly (42).

5. The low-noise motor rotor dynamic balancing testing device according to claim 4, characterized in that: The positioning component (42) includes an arc-shaped block (421) that is rotatably connected to the upper rear side of the support block (41) via a hinge seat. The inner cavity of the arc-shaped block (421) is symmetrically connected to a spring plate (423). The lower ends of the two spring plates (423) are fixedly connected to a connecting rod (424). The two connecting rods (424) extend through the inner cavity of the arc-shaped block (421) to the inner arc surface of the arc-shaped block (421) and are rotatably connected to a roller (425) that fits against the outer surface of the rotor central shaft. The front side of the left end of the arc-shaped block (421) is provided with a locking hole (422) that communicates with the right end. The locking hole (422) is adapted to the sliding column (432). When the locking hole (422) is inside the buffer groove (411), the sliding column (432) slides into the locking hole (422) under the action of the spring limiting ring (433).

6. The low-noise motor rotor dynamic balancing testing device according to claim 1, characterized in that: The rotor fixing structure (6) includes an I-ring (62) with I-shaped grooves on its outer surface. The I-ring (62) is symmetrically fixed to the support plate (3) with damping rods (621) fixedly connected to the support plate (3) at one end. The inner surface of the I-ring (62) is provided with limiting grooves (622) that communicate with the outer I-shaped grooves. The inner surface of the I-ring (62) is provided with a plurality of clamping assemblies (63) for fixing the rotor center shaft. The clamping assemblies (63) are slidably connected to the inner surface of the adjacent limiting grooves (622). The outer surface of the I-ring (62) is provided with a driving assembly (61) for driving the clamping assemblies (63) to clamp the rotor center shaft.

7. The low-noise motor rotor dynamic balancing testing device according to claim 6, characterized in that: The drive assembly (61) includes a rotating ring (611) sleeved on the outer surface of the I-shaped ring (62). A number of wedge blocks (612) are fixedly connected in a ring on the inner surface of the rotating ring (611). The outer surface of the wedge blocks (612) is slidably connected to the inner surface of the I-shaped groove of the I-shaped ring (62) and fits against the clamping assembly (63). When the rotating ring (611) rotates, the wedge blocks (612) slide in the I-shaped ring (62) and drive the clamping assembly (63) to clamp or release the rotor. The inner surface of the support plate (3) is provided with a positioning component (613) that drives the drive assembly (61) to rotate.

8. The low-noise motor rotor dynamic balancing testing device according to claim 7, characterized in that: The clamping assembly (63) includes a hollow rod (631) that is slidably connected to the inner surface of the limiting groove (622). A return spring (637) is provided on the inner surface of the hollow rod (631) and fixedly connected to the inner arc surface of the limiting groove (622). The side of the hollow rod (631) located in the I-shaped groove of the I-shaped ring (62) is in close contact with the wedge surface of the adjacent wedge block (612). The side of the hollow rod (631) located on the inner surface of the I-shaped ring (62) is fixedly connected to the second mounting base (632). The second mounting base (632) is fixedly connected to the left and right sides of both sides. The two elastic arms (634) are rotatably connected to the connecting rod (633) that is rotatably connected to the inner surface of the I-shaped ring (62) on the side of the two elastic arms (634) near the inner surface of the I-shaped ring (62).

9. The low-noise motor rotor dynamic balancing testing device according to claim 8, characterized in that: The clamping assembly (63) further includes a movable block (635) that is slidably connected to the inner surface of the mounting base (632). The inner surface of the movable block (635) is slidably connected to a spring plate (636) that is fixedly connected to the inner surface of the mounting base (632). The movable block (635) is always in contact with the outer surface of the rotor central shaft under the action of the spring plate (636). A vibration sensor is provided on the lower side of the movable block (635).

10. The low-noise motor rotor dynamic balancing testing device according to claim 7, characterized in that: The positioning component (613) includes a buffer plate (6131) rotatably mounted on the side of the support plate (3) away from the eccentric detection structure (5). A central rod (6133) is fixedly connected to the side of the buffer plate (6131) closest to the eccentric detection structure (5) and slidably connected to the inner surface of the support plate (3). A contact plate (6132) for abutting against the rotor's central shaft is fixedly connected to the side of the central rod (6133) away from the buffer plate (6131). Helical grooves are annularly distributed on the outer surface of the central rod (6133). (6133) The outer surface is rotatably connected to a driven ring (6134) that is slidably connected to a spiral groove. The outer surface of the driven ring (6134) is provided with a transmission ring (6135) that is pulsally connected to the rotating ring (611) via a fixed rod. When the contact plate (6132) contacts the stator, the center rod (6133) moves away from the eccentric detection structure (5) under the action of the contact plate (6132) and drives the driven ring (6134) and the transmission ring (6135) to rotate synchronously through the spiral groove, thereby driving the rotating ring (611) to rotate.

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