Hollow shaft rotor dynamic balance testing device and testing method

Abstract

The present application relates to rotor dynamic balance measurement technical field, specifically point to a kind of hollow shaft rotor dynamic balance testing device and testing method.The present test device includes fixed shaft, the fixed shaft is used to insert hollow shaft rotor and connect hollow shaft rotor, fixed shaft two ends protrude hollow shaft rotor end face;Drive device, the drive device is arranged in the side of fixed shaft for driving hollow shaft rotor rotation;Dynamic balance support frame, the dynamic balance support frame is used to support fixed shaft at the two ends of hollow shaft rotor, and rotationally connected with fixed shaft;Test component, the test component is used to detect the vibration data of fixed shaft, and the dynamic unbalance of hollow shaft rotor is calculated according to vibration data;The vibration data includes vibration amplitude and corresponding angle phase.Fixed shaft passes through the rotationally connected dynamic balance support frame of connection hollow shaft rotor, so that the circumferential surface of hollow shaft rotor can be used to be driven by drive device rotation, cooperate test component to realize the measurement of dynamic unbalance.

Description

Technical Field

[0001] This invention relates to the field of rotor dynamic balancing measurement technology, specifically to a hollow shaft rotor dynamic balancing testing device and testing method. Background Technology

[0002] Rotor imbalance is one of the main causes of excessive rotor vibration and noise, directly affecting engine performance and service life. Due to uneven material composition, defects in the blank, or errors in processing and assembly, the centrifugal inertial forces generated by each tiny particle cannot cancel each other out. These centrifugal inertial forces cause vibration, generate noise, accelerate bearing wear, shorten mechanical life, and in severe cases, can lead to destructive accidents. Therefore, it is necessary to dynamically balance the rotor to achieve the allowable balance accuracy level, or reduce the resulting mechanical vibration amplitude to within the allowable range.

[0003] Patent publication number "CN215414200U" discloses a bearing structure for measuring the dynamic balancing of a motor rotor, including a base; a support unit, which is detachably mounted on the upper surface of the base and includes two sets of cooperating support modules; each set of support modules includes a base with a boss on its upper surface, a support frame mounted on the upper surface of the boss, a junction box mounted on the side of the support frame, strain gauges mounted inside the junction box and inside the support frame, a bearing seat connecting the lower ends of the two strain gauges, and a support plate mounted on the bearing seat, the upper end of the support plate having a support groove; and a power component for driving the rotor to rotate. However, some oil-cooled motor rotors adopt a hollow shaft structure design. During measurement, a transmission belt is often used to abut against the outer circumference of the hollow shaft rotor to drive the hollow shaft rotor to rotate. Due to the size limitation of the hollow shaft rotor, there is not enough axial space on the shaft to support the rotor's dynamic balancing; this device supports the rotor through the support groove and is not suitable for testing rotors with short shaft lengths. Summary of the Invention

[0004] The main objective of this invention is to address the shortcomings of the aforementioned background technology and provide a hollow shaft rotor dynamic balancing test device and test method.

[0005] The technical solution adopted in this invention is: a hollow shaft rotor dynamic balancing testing device, comprising,

[0006] A fixed shaft is used to insert into the hollow shaft rotor and fix it to the hollow shaft rotor. Both ends of the fixed shaft extend out of the end face of the hollow shaft rotor.

[0007] The drive device is located on one side of the fixed shaft and is used to drive the hollow shaft rotor to rotate around the axial direction;

[0008] A dynamic balancing support frame is used to support fixed shafts at both ends of a hollow shaft rotor and is rotatably connected to the fixed shafts;

[0009] The testing component is used to detect vibration data of the fixed shaft and calculate the dynamic imbalance of the hollow shaft rotor based on the vibration data; the vibration data includes vibration amplitude and corresponding angular phase.

[0010] Furthermore, the test components include,

[0011] A vibration sensor, used to detect the vibration amplitude of a fixed shaft rotation;

[0012] A phase sensor is used to detect the angular phase of rotation of a fixed shaft;

[0013] The controller receives and calculates the dynamic imbalance m = AM / R of the hollow shaft rotor based on the vibration data, where M is the total mass of the rotor and the fixed shaft (in kg) and R is the rotor workpiece correction radius (in mm).

[0014] Furthermore, it also includes a weight reduction mechanism, which is used to remove excess dynamic imbalance m on the hollow shaft rotor in the angular phase direction corresponding to the amplitude.

[0015] Furthermore, the weight reduction mechanism includes a drilling mechanism for drilling holes in the hollow shaft rotor in the angular phase direction corresponding to the amplitude to reduce weight, thereby reducing the weight by m. 减 =AM / R.

[0016] Furthermore, the fixed shaft is provided with a first limiting mechanism and a second limiting mechanism located on both sides of the hollow shaft rotor, and the second limiting mechanism is detachably mounted on the fixed shaft.

[0017] Furthermore, the first limiting mechanism includes a baffle on the fixed shaft, the baffle being fixedly connected to the fixed shaft to form a shoulder for limiting the hollow shaft rotor; the second limiting mechanism includes an external thread on the fixed shaft and a locking nut that is fitted onto the external thread.

[0018] Furthermore, the dynamic balancing support frame is provided with multiple test rollers, which support the fixed shaft around its circumferential side and make rolling contact with the fixed shaft.

[0019] In another aspect, the present invention provides a method for testing rotor dynamic balancing using the aforementioned hollow shaft rotor dynamic balancing testing device. The testing method includes the following steps:

[0020] The hollow shaft rotor is mounted on a dynamic balance support frame so that it can rotate around the axial direction;

[0021] Drive the hollow shaft rotor to rotate axially around the hollow shaft rotor;

[0022] Vibration data is collected during the rotation of the hollow shaft rotor. The vibration data includes the vibration amplitude and the corresponding angular phase.

[0023] Based on the vibration data, the dynamic imbalance of the hollow shaft rotor is calculated as m = AM / R, where A is the amplitude (unit: mm), M is the total mass of the hollow shaft rotor and the fixed shaft (unit: kg), and R is the rotor workpiece correction radius (unit: mm).

[0024] Furthermore, the method of mounting the hollow shaft rotor rotatably on the dynamic balance support frame includes using a fixed shaft with a baffle to pass through the hollow shaft rotor and using a lock nut to fix the hollow shaft rotor to the fixed shaft.

[0025] Furthermore, the test method also includes determining whether the amplitude A is greater than the allowable eccentricity e (in mm). n is the rotational speed in rpm / min, and G is the rotor balance accuracy grade;

[0026] If not, it means that the hollow shaft rotor 2 tested is in a dynamic balance state;

[0027] No, use a weight reduction mechanism to remove the excess dynamic imbalance m on the hollow shaft rotor 2 in the angular phase direction corresponding to the amplitude.

[0028] Furthermore, the step of using a weight-reduction mechanism to remove excess dynamic imbalance m on the hollow shaft rotor 2 in the angular phase direction corresponding to the amplitude includes using a drilling mechanism to drill holes on the hollow shaft rotor in the angular phase direction corresponding to the amplitude to reduce weight, thereby reducing the weight m. 减 =AM / R; When the weight is reduced by m for each hole drilled. 减 When the value is fixed, adjust the length of R so that R = AM / m 减 .

[0029] The beneficial effects of the present invention include: 1. A hollow shaft rotor can be inserted and fixed to it by means of a fixed shaft, and the fixed shaft extending out of the end face of the hollow shaft rotor can be rolled and connected to the dynamic balance support frame. The outer circumference of the hollow shaft rotor can be driven to rotate by the driving device. With the help of the test components, the dynamic imbalance can be measured, which solves the technical problem that it is inconvenient to measure the dynamic imbalance when the shaft length of some hollow shaft rotors is too short.

[0030] 2. The vibration amplitude and corresponding angular phase when the fixed shaft rotates can be detected by vibration sensors and phase sensors. The controller can calculate the dynamic imbalance after calculating the vibration data, which can realize automated calculation.

[0031] 3. The weight reduction mechanism can be used to remove excess dynamic imbalance on the hollow shaft rotor, and can realize the dynamic balance correction of the hollow shaft rotor;

[0032] 4. The punching mechanism is used as a weight reduction mechanism, which removes weight in a concentrated manner, making weight reduction convenient and facilitating dynamic balancing of the hollow shaft rotor.

[0033] 5. The first limiting mechanism and the detachable second limiting mechanism facilitate the fixing of the hollow shaft rotor on the fixed shaft, preventing axial sliding along the fixed shaft and phase rotation in the circumferential direction;

[0034] 6. The first and second limit mechanisms have very simple structures. They use baffles to form shoulders with the fixed shaft. The second limit mechanism uses a threaded connection to facilitate the locking of the hollow shaft rotor with the lock nut. It is easy to use and the connection is reliable.

[0035] 7. Multiple test rollers roll around the outer circumference of the fixed shaft, making it easy to roll the fixed shaft onto the dynamic balance support frame.

[0036] 8. The rotor dynamic balancing test method of the present invention fully utilizes the advantages of the hollow shaft rotor dynamic balancing test device of the present invention. The test method is simple to operate and solves the measurement problem of dynamic balancing of hollow shaft rotors with short shaft length.

[0037] 9. The method of fixing the hollow shaft rotation is very simple. The hollow shaft rotor is fixed to the fixed shaft by the fixed shaft with baffle and the locking nut, which makes it convenient to install on the dynamic balance support frame for testing.

[0038] 10. In this method, the punching mechanism adjusts the weight reduction m in the corresponding phase direction. 减 The relationship between the correction radius R of the rotor and the workpiece is used to select an appropriate correction radius distance for drilling. This can remove excess imbalance and ensure that the dynamic balance of the hollow shaft rotor, which is fixed to the fixed shaft, meets the standard. This avoids the need to change drilling and milling cutters with different hole diameters and makes weight removal more convenient.

[0039] The hollow shaft rotor dynamic balancing test device and test method of the present invention can be used to test the dynamic imbalance of hollow shaft rotors with short shaft lengths. A fixed shaft passes through the fixed hollow shaft rotor and is rotatably connected to the dynamic balancing support frame, so that the circumferential surface of the hollow shaft rotor can be driven to rotate by the driving device. With the help of the test components, the dynamic imbalance can be measured. Attached Figure Description

[0040] Figure 1 : Schematic diagram of the hollow shaft rotor dynamic balancing test device of the present invention;

[0041] Figure 2 Schematic diagram of a hollow shaft rotor fixed to a fixed shaft;

[0042] Figure 3 Top view of a dynamic balancing support frame with a fixed shaft connection;

[0043] Figure 4 Side view of a dynamic balancing support frame with a fixed shaft connection;

[0044] Figure 5 Vibration spectrum diagram;

[0045] Wherein: 1—fixed shaft; 11—baffle; 12—external thread; 13—locking nut; 2—hollow shaft rotor; 3—drive device; 31—transmission belt; 4—dynamic balance support frame; 41—test roller; 5—vibration sensor; 6—phase sensor; 7—controller. Detailed Implementation

[0046] Embodiments of the present invention are described in detail below, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0047] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0050] This invention relates to a dynamic balancing test device for a hollow shaft rotor 2, which can be used to measure hollow shaft rotors with short shaft lengths. A fixed shaft 1 passes through the hollow shaft rotor 2 and extends out of the two end faces of the hollow shaft rotor 2, so that the fixed shaft 1 and the hollow shaft rotor 2 are fixedly connected as a whole. The two ends of the fixed shaft 1 can be rotatably connected to the dynamic balancing support frame 4. The drive device 3 can drive the hollow shaft rotor 2 to rotate by abutting against the circumferential side of the hollow shaft rotor 2 through the conveyor belt. The device works with the test components to detect vibration data and calculate the dynamic imbalance of the hollow shaft rotor 2 based on the vibration data.

[0051] A dynamic balancing test device for a hollow shaft rotor, such as Figures 1-4 As shown, the device includes a fixed shaft 1, a drive unit 3, a dynamic balancing support frame 4, and a testing assembly. The fixed shaft 1 is in a dynamic balanced state and is used to insert into the hollow shaft rotor 2 to fix the hollow shaft rotor 2. Both ends of the fixed shaft 1 extend out of the end faces of the hollow shaft rotor 2, and the fixed shaft 1 can also be connected to the hollow shaft rotor 2 with an interference fit. The drive unit 3 is located on one side of the fixed shaft 1 and is used to drive the hollow shaft rotor 2 to rotate around the axial direction. The dynamic balancing support frame 4 is used to support the fixed shaft 1 at both ends of the hollow shaft rotor 2 and is rotatably connected to the fixed shaft 1, that is, the fixed shaft 1 can rotate around the axial direction when mounted on the dynamic balancing support frame 4. The testing assembly is used to detect the vibration data of the fixed shaft 1 and calculate the dynamic imbalance of the hollow shaft rotor 2 based on the vibration data. The vibration data includes the vibration amplitude and the corresponding angular phase.

[0052] In one embodiment, the test component is described in detail, such as... Figure 1 As shown, the test assembly includes a vibration sensor 5, a phase sensor 6, and a controller 7. The vibration sensor 5 can be installed at both ends of the fixed shaft 1 to detect the vibration amplitude of the fixed shaft 1, depending on the actual situation. The phase sensor 6 is used to detect the angular phase of the rotation of the fixed shaft 1. Specifically, the phase sensor 6 is a photoelectric sensor, and the reflector used in conjunction with the photoelectric sensor is fixed on the fixed shaft 1. After the fixed shaft 1 rotates, the photoelectric sensor can detect the angular phase of the rotation of the fixed shaft 1. The controller 7 is used to receive and calculate the dynamic imbalance m = AM / R of the hollow shaft rotor 2 based on the vibration data, where M is the total mass of the rotor and the fixed shaft 1 (unit: kg), and R is the rotor workpiece correction radius (unit: mm).

[0053] When the hollow shaft rotor 2 rotates axially, it vibrates under dynamic imbalance. The vibration direction is always along the centrifugal force direction, and the vibration amplitude is the centrifugal distance. The vibration sensor 5 detects the vibration amplitude in a fixed direction. Since the centrifugal force direction is the direction of the unbalanced force, when the detected vibration amplitude is at its maximum value (amplitude A), the fixed direction for detecting the vibration amplitude is consistent with the centrifugal force direction. The centrifugal force of the fixed shaft 1 and the hollow shaft rotor 2, which are fixed together as a whole, minus its centripetal force, is the unbalanced force that generates the vibration, F = Mω. 2A, ω is the angular velocity (unit: rad / s), and the unbalanced force F is the magnitude of the force that the hollow shaft rotor 2 needs to balance. We then determine mω. 2 R = Mω 2 A, i.e., mR = AM; the controller 7 can draw a vibration spectrum diagram based on the collected vibration data, such as... Figure 5 As shown, the peak of the vibration spectrum is the amplitude. The phase corresponding to the peak is de-weighted, or the phase corresponding to the trough is weighted. The mass of the de-weighted or weighted phase is the dynamic imbalance m. When the phase angle is 0°, the vibration amplitude is not necessarily 0 mm.

[0054] Based on the test components including vibration sensor 5, phase sensor 6 and controller 7, the dynamic balancing test device of the present invention also includes a weight reduction mechanism, which is used to remove the excess dynamic imbalance m on the hollow shaft rotor 2 at a suitable distance from the axis in the angular phase direction corresponding to the amplitude, so that the device has the function of correcting dynamic balance, and after detecting the dynamic imbalance, corrects the hollow shaft rotor 2 to a dynamic balanced state.

[0055] Based on the weight reduction mechanism, in some embodiments, the weight reduction mechanism is preferably a drilling mechanism, used to drill holes in the hollow shaft rotor 2 in the angular phase direction corresponding to the amplitude to reduce weight, so that the weight reduction m 减 =AM / R, the controller 7 regulates the punching mechanism to automatically punch holes at a position R from the axis on the hollow shaft rotor 2, corresponding to the angular phase direction of the amplitude. Punching for weight reduction is convenient and quick, and can centrally remove excess dynamic imbalance. In actual use, holes can be punched on the blades of the hollow shaft rotor 2. The controller 7 automatically regulates the punching mechanism to punch holes at a position R from the axis on the phase corresponding to the wave crest, ensuring that the weight reduction mass from punching meets the m... 减 =AM / R, avoiding phase errors caused by manual alignment during drilling.

[0056] In one embodiment, such as Figures 2-3 As shown, the fixed shaft 1 is provided with a first limiting mechanism and a second limiting mechanism located on both sides of the hollow shaft rotor 2, which are used to fix the hollow shaft rotor 2 to the fixed shaft 1. The second limiting mechanism is detachably provided on the fixed shaft 1, so that one end of the fixed shaft 1 can pass through the fixed shaft 1 and then the second limiting mechanism can be installed.

[0057] Based on the first and second limit mechanisms, such as Figures 2-3As shown, the first limiting mechanism includes a baffle 11 mounted on the fixed shaft 1, which is fixedly connected to the fixed shaft 1 to form a shoulder that limits the hollow shaft rotor 2. The second limiting mechanism includes an external thread 12 mounted on the fixed shaft 1 and a locking nut 13 that is fitted onto the external thread 12. The hollow shaft rotor 2 can be fixed onto the hollow shaft by the baffle 11 and the locking nut 13. Optionally, the external thread 12 is arranged in the same direction as the rotation direction of the hollow shaft rotor 2, that is, the rotation direction of the hollow shaft rotor 2 is opposite to the locking rotation direction of the locking nut 13. For example, the locking nut 13 is locked by rotating counterclockwise, thus preventing the locking nut 13 from loosening when the hollow shaft rotor 2 rotates.

[0058] In one embodiment, such as Figures 3-4 As shown, the rotational connection method between the fixed shaft 1 and the dynamic balancing support frame 4 is specifically described. The two dynamic balancing support frames 4 are arranged opposite each other, and multiple test rollers 41 are provided on the opposite sides of the dynamic balancing support frame 4. The multiple test rollers 41 are arranged on the corresponding dynamic balancing support frame 4 and distributed around the circumference of the fixed shaft 1. Specifically, but not limited to, using two test rollers 41 to support one end of the fixed shaft 1 in a rolling connection, the distance between the two test rollers 41 can be smaller than the outer diameter of the fixed shaft 1, so that the fixed shaft 1 can be placed between the two test rollers 41, so that the transmission belt 31 of the drive device 3 abuts against the circumferential side of the hollow shaft rotor 2 above the hollow shaft rotor 2. While driving the hollow shaft rotor 2 to rotate, the hollow shaft rotor 2 can be relatively stably fixed on the dynamic balancing support frame 4.

[0059] In one embodiment, such as Figure 4 As shown, a motor is used as the drive device 3. The output end of the motor is wound with a ring-shaped transmission belt 31. The other end of the transmission belt 31 passes over the hollow shaft rotor 2 and is wound with a fixed driven wheel. The outer side of the transmission belt 31 is pressed against the outer circumference of the hollow shaft rotor 2. When the transmission belt rotates, it drives the hollow shaft rotor 2 to rotate. The two end faces of the fixed shaft 1 can contact the dynamic balance support frame 4, which axially limits the fixed shaft 1 between the two dynamic balance support frames 4 during rotation.

[0060] The present invention also provides a method for testing rotor dynamic balancing, using the above-described hollow shaft rotor 2 dynamic balancing testing device, the testing method comprising the following steps:

[0061] S1. The hollow shaft rotor 2 is rotatably mounted on the dynamic balance support frame 4.

[0062] S2. Use the drive device 3 to drive the hollow shaft rotor 2 to rotate axially around the hollow shaft rotor 2;

[0063] S3. Collect vibration data when the hollow shaft rotor 2 rotates. The vibration data includes the vibration amplitude and the corresponding angular phase.

[0064] S4. Calculate the dynamic imbalance m = AM / R of the hollow shaft rotor 2 based on the vibration data, where A is the amplitude (unit: mm), M is the total mass of the hollow shaft rotor 2 and the fixed shaft 1 (unit: kg), and R is the rotor workpiece correction radius (unit: mm).

[0065] According to the testing method provided by the present invention, in step S1, mounting the hollow shaft rotor 2 rotatably on the dynamic balance support frame 4 includes passing a fixed shaft 1 with a baffle 11 through the hollow shaft rotor 2, and using a locking nut 13 threadedly connected to one end of the fixed shaft 1 relative to the baffle 11 to fix the hollow shaft rotor 2 to the fixed shaft 1. The baffle 11 and the locking nut 13 can limit the hollow shaft rotor 2 in the axial direction, and simultaneously clamp and fix the hollow shaft rotor 2 to the fixed shaft 1. Optionally, the fixed shaft 1 and the hollow shaft rotor 2 are connected by an interference fit to increase the stability of the hollow shaft rotor 2 fixed to the fixed shaft 1 in the circumferential direction, and further prevent the hollow shaft rotor 2 from rotating relative to the fixed shaft 1.

[0066] In an optional embodiment, the testing method provided by this invention further includes the following steps:

[0067] S5. Determine whether the amplitude A is greater than the allowable eccentricity e (unit: mm);

[0068] If not, it means that the hollow shaft rotor 2 tested is in a dynamic balance state;

[0069] No, use a weight reduction mechanism to remove the excess dynamic imbalance m on the hollow shaft rotor 2 in the angular phase direction corresponding to the amplitude.

[0070] in, n is the rotational speed in rpm / min, and G is the rotor balance accuracy grade, which is selected according to the rotor accuracy requirement grade, as shown in Appendix 1 below;

[0071] Appendix 1

[0072]

[0073] According to the test method provided by the present invention, in step S5 above, removing the excess dynamic imbalance m on the hollow shaft rotor 2 using a weight reduction mechanism in the angular phase direction corresponding to the amplitude includes:

[0074] S51. Using a drilling mechanism as a weight reduction mechanism, holes are drilled in the hollow shaft rotor 2 in the angular phase direction corresponding to the amplitude to reduce weight, so that the weight reduction is m. 减 =m=AM / R; When the weight is reduced by m each time a hole is drilled 减 When the value is fixed, adjust the length of R so that R = AM / m 减 The centrifugal force of the fixed shaft 1 and the hollow shaft rotor 2, which are fixed together as a whole, minus its centripetal force, is the unbalanced force that generates vibration, F = Mω. 2A, the unbalanced force F, i.e., the force that the hollow shaft rotor 2 needs to balance, so that m 减 ω 2 R = Mω 2 A can balance the unbalanced force F. Since the drill bit size of the drilling mechanism is fixed and the thickness of the wing is uniform, the drilling quality is fixed each time. Changing the drill bit will increase the operation time. Adjusting the relationship between the drilling distance from the axis and the drilling quality to satisfy R = AM / m minus can eliminate the need to change the drill bit and save operation time.

[0075] In actual use, one end of the fixed shaft 1 is passed through the hollow shaft rotor 2, and the hollow shaft rotor 2 is clamped and fixed between the baffles 11 by using a locking nut 13 threaded onto the fixed shaft 1. The two ends of the fixed shaft 1 are respectively placed between the two test rollers 41 of the dynamic balancing support frame 4. The drive device 3 uses a conveyor belt to press against the outer circumference of the hollow shaft rotor 2 on the other side relative to the two test rollers 41, limiting the hollow shaft rotor 2 on the dynamic balancing support frame 4 and simultaneously driving the hollow shaft rotor 2 to rotate around the shaft, while the fixed shaft 1 rotates synchronously. The phase sensor 6, located on the outside of the dynamic balance support frame 4, detects the angular phase of the fixed shaft 1. The vibration sensor 5, located on the side of the fixed shaft 1, detects the vibration amplitude of the fixed shaft 1 in a fixed direction. The controller 7 is connected to the vibration sensor 5 and the phase sensor 6 to receive the vibration data. The drive device 3 is started to drive the hollow shaft rotor 2 and the fixed shaft 1 to rotate. The controller 7 receives the vibration data and converts it into a vibration spectrum diagram, calculates the dynamic imbalance m = AM / R, and drills a hole at a position R away from the axis at the phase corresponding to the wave peak, so that the mass removed by the hole meets the m requirement. 减 =AM / R, so that the hollow shaft rotor 2, which is connected to the fixed shaft 1 as a whole, is in a dynamic balanced state.

[0076] 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 dynamic balancing testing device for a hollow shaft rotor, characterized in that: include, Fixed shaft (1) is used to insert into the hollow shaft rotor (2) and fix the hollow shaft rotor (2). Both ends of the fixed shaft (1) extend out of the end face of the hollow shaft rotor (2). Drive device (3), the drive device (3) is located on one side of the fixed shaft (1) and is used to drive the hollow shaft rotor (2) to rotate around the axial direction; Dynamic balancing support frame (4) is used to support the fixed shaft (1) at both ends of the hollow shaft rotor (2) and is rotatably connected to the fixed shaft (1); The test component is used to detect the vibration data of the fixed shaft (1) and calculate the dynamic imbalance of the hollow shaft rotor (2) based on the vibration data. The vibration data includes the vibration amplitude and the corresponding angular phase. The test component includes a vibration sensor (5), a phase sensor (6) and a controller (7). The vibration sensor (5) is used to detect the vibration amplitude of the fixed shaft (1) rotation. The phase sensor (6) is used to detect the angular phase of the fixed shaft (1) rotation. The controller (7) receives and calculates the dynamic imbalance m = AM / R of the hollow shaft rotor (2) based on the vibration data. A is the amplitude, M is the total mass of the rotor and the fixed shaft (1), and R is the rotor workpiece correction radius. The weight reduction mechanism is used to remove excess dynamic imbalance m on the hollow shaft rotor (2) in the angular phase direction corresponding to the amplitude. The weight reduction mechanism includes a drilling mechanism for drilling holes on the hollow shaft rotor (2) in the angular phase direction corresponding to the amplitude to reduce weight, thereby reducing the weight m. 减 =m=AM / R.

2. The hollow shaft rotor dynamic balancing test device as described in claim 1, characterized in that: The fixed shaft (1) is provided with a first limiting mechanism and a second limiting mechanism located on both sides of the hollow shaft rotor (2), and the second limiting mechanism is detachably mounted on the fixed shaft (1).

3. The hollow shaft rotor dynamic balancing test device as described in claim 2, characterized in that: The first limiting mechanism includes a baffle (11) provided on the fixed shaft (1), and the baffle (11) is fixedly connected to the fixed shaft (1) to form a shoulder for limiting the hollow shaft rotor (2); the second limiting mechanism includes an external thread (12) provided on the fixed shaft (1) and a locking nut (13) that is fitted and connected to the external thread (12).

4. The hollow shaft rotor dynamic balancing test device as described in claim 1, characterized in that: The dynamic balancing support frame (4) is provided with multiple test rollers (41), which support the fixed shaft (1) around the circumferential side of the fixed shaft (1) and roll in contact with the fixed shaft (1).

5. A method for testing rotor dynamic balancing, characterized in that: The testing method, using the testing apparatus as described in any one of claims 1-4, includes... The hollow shaft rotor (2) is rotatable about the axial direction and mounted on the dynamic balance support frame (4); Drive the hollow shaft rotor (2) to rotate axially around the hollow shaft rotor (2); Vibration data of the hollow shaft rotor (2) during rotation are collected. The vibration data includes the vibration amplitude and the corresponding angular phase. Based on the vibration data, the dynamic imbalance of the hollow shaft rotor (2) is calculated as m = AM / R, where A is the amplitude, M is the total mass of the hollow shaft rotor (2) and the fixed shaft (1), and R is the rotor workpiece correction radius.

6. The rotor dynamic balancing test method as described in claim 5, characterized in that: The process of mounting the hollow shaft rotor (2) rotatably on the dynamic balance support frame (4) includes passing a fixed shaft (1) with a baffle (11) through the hollow shaft rotor (2) and fixing the hollow shaft rotor (2) on the fixed shaft (1) with a lock nut (13).

7. The rotor dynamic balancing test method as described in claim 5, characterized in that: It also includes, Determine whether the amplitude A is greater than the allowable eccentricity e (in mm). n is the rotational speed in rpm / min, and G is the rotor balance accuracy grade; If not, it means that the hollow shaft rotor (2) being tested is in a state of dynamic balance; No, use a weight reduction mechanism to remove excess dynamic imbalance m on the hollow shaft rotor (2) in the angular phase direction corresponding to the amplitude.

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