A motor rotor dynamic balance test device

Abstract

The present invention discloses a motor rotor dynamic balancing test device, which relates to the field of motor rotor testing technology. The device comprises a base and a support mechanism fixed to the base. The support mechanism comprises two brackets. A transfer mechanism for transferring and loading the rotor is provided between the two brackets. The transfer mechanism comprises a rotating drum, a plurality of connecting rods, a plurality of groups of clamps for clamping the rotor, and a control component for driving a single group of clamps to open or close. Compared with the prior art, the present invention realizes the clamping and transfer of the rotating shaft through the cooperation of the control component and the clamp. The control component uses gas flow to control the opening and closing of the clamp, thereby reducing interference caused by the operation of the electronic equipment and improving the accuracy and stability of the test. At the same time, by controlling the flow and pressure of the gas, the opening and closing action of the clamp can be further adjusted, thereby meeting the requirements of different rotor dynamic balancing tests and improving the test efficiency and accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of motor rotor testing, and in particular to a motor rotor dynamic balance testing device. Background Art

[0002] Motor dynamic balancing tests are performed to determine the dynamic balance of the motor rotor. This is a crucial step in ensuring stable motor operation and reducing vibration. Vibration data analysis can be used to determine rotor imbalance. This imbalance can arise from manufacturing errors within the rotor itself or from wear and tear caused by impurities attached to the rotor. Based on the imbalance detected, mass can be added or removed from the rotor to offset the imbalance.

[0003] When performing a dynamic balance test on a generator rotor, the existing dynamic balance test equipment needs to first remove and store the generator rotor that has been tested on the test equipment, and then replace it with a new generator rotor for testing. This is relatively inconvenient, especially when performing a dynamic balance test on the rotor of a large generator such as a steam turbine generator, it is necessary to use a lifting equipment to move the generator rotor, which is inconvenient to replace the generator rotor, greatly reducing the replacement speed of the generator rotor and reducing the detection efficiency of the generator rotor.

[0004] The existing Chinese patent, CN116558715B, discloses a generator dynamic balancing test device. The invention includes a base, on which two bases are slidably mounted on the top, an electric slider 1 for driving the bases to slide is fixedly mounted on the base, a support plate is slidably mounted on the base, an electric push rod 5 connected to the support plate is fixedly mounted on the base, a through hole is formed on the support plate, and a rotating block is rotatably mounted on one side of the through hole on the support plate. By providing a material replacement mechanism, the invention replaces the replacement method of first removing and storing the tested generator rotor from the test equipment and then replacing it with a new generator rotor for testing when performing a dynamic balancing test on the generator rotor, thereby facilitating the replacement of the generator rotor, greatly improving the replacement speed of the generator rotor, and improving the detection efficiency of the generator rotor.

[0005] However, this invention patent still has the following problems: when the above patent fixes the rotating shaft through two arc-shaped fixing plates, the two arc-shaped fixing plates are pushed to rotate by an electric cylinder or an electric push rod. However, in the dynamic balancing test of the motor rotor, the electric push rod or electric cylinder is used as a power source, and its operation will inevitably generate electromagnetic noise, power supply disturbances and mechanical vibrations, which may become interference sources, resulting in inaccurate test data, and thus affecting the test results. In addition, although this patent can fix generator rotors of different specifications by setting a lifting plate and an electric cylinder, since the size of each set of arc-shaped fixing plates is fixed, when transferring and replacing rotors of different models, inappropriate clamping can easily cause the rotor to shake and collide in each set of arc-shaped fixing plates, thereby affecting the detection results of the rotor.

[0006] In view of the above problems, a motor rotor dynamic balancing test device is proposed. Summary of the Invention

[0007] The object of the present invention is to provide a motor rotor dynamic balancing test device to solve the above-mentioned problem.

[0008] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0009] A motor rotor dynamic balancing test device comprises a base, a supporting mechanism fixed on the base and a testing mechanism for performing a dynamic balancing test on the rotor, the supporting mechanism comprises two brackets, a V-groove is provided at the middle position of the top of each bracket, and the two V-grooves are symmetrically arranged, a transfer mechanism for transferring and loading the rotor is provided between the two brackets, the transfer mechanism comprises a rotating drum, a plurality of connecting rods, a plurality of groups of clamps for clamping the rotor, and a control component for driving a single group of clamps to open or close, the rotating drum is rotatably arranged between the two brackets, a plurality of the support rods are evenly fixed on the outer wall of the rotating drum along the circumferential direction, each group of the clamps is correspondingly hinged on a plurality of connecting rods, telescopic hinged rods are hinged on both sides of the connecting rods, and the ends of all the telescopic hinged rods away from the connecting rods are hinged to the outer walls of the adjacent clamps, and the control component is installed inside the rotating drum.

[0010] As a preferred solution of the present invention, both ends of the rotating drum are connected to fixed tubes, and the two fixed tubes are rotatably connected to two brackets respectively, one of the fixed tubes is fixedly connected to the outer wall of a gear, and one of the brackets is provided with a driving mechanism for driving the gear to rotate.

[0011] The air filter press of the present invention is connected with the air filter press of the fixing cylinder, and the fixing cylinder is fixed with the fixing rod at both ends, and the fixing rod is respectively passed through the fixing tube corresponding thereto and fixedly connected with the adjacent bracket. The cross bar is arranged on the middle part of the fixing cylinder and is fixedly connected with the inner wall of the fixing cylinder. The vertical bar is fixedly arranged on the middle position of the bottom of the cross bar and is fixedly connected with the inner wall of the fixing cylinder. The cross bar and the vertical bar divide the interior of the fixing cylinder into a closed cavity, an air inlet cavity and an air outlet cavity. One side of the inner wall of the fixing cylinder is provided with an air inlet connecting the air inlet cavity and the rotating cylinder, and the other side of the inner wall of the fixing cylinder is provided with an exhaust port connecting the air outlet cavity and the rotating cylinder. The vertical plate is provided with an air connecting pipe connecting the air inlet cavity and the outlet cavity, and a one-way valve is provided inside the connecting air pipe, and an air supply pipe connected with the inlet cavity is provided inside one of the fixing rods, and the other end of the air supply pipe passes through the bracket and extends to the outside of the bracket.

[0012] As a preferred solution of the present invention, the telescopic hinged rod includes a movable cylinder and a movable rod, the bottom end of the movable cylinder is hinged to the connecting support rod through a hinge shaft, the movable rod is axially sealed and slidably connected to the inside of the movable cylinder, and the end of the movable rod away from the movable cylinder is hinged to the outer wall of the clamp through a hinge shaft, and a reset spring is connected between the movable cylinder and the movable rod.

[0013] As a preferred solution of the present invention, all the connecting rods are provided with air guide holes communicating with the interior of the rotating cylinder, and an L-shaped notch is connected between the air guide holes and the movable cylinder;

[0014] When the air guide hole is connected to the air inlet cavity, gas enters the air guide hole and pushes the movable rod inside the movable cylinder to move, so as to close the group of clamps. When the air guide hole is connected to the air outlet cavity, the gas inside the air guide hole is discharged, and after the movable rod is reset, the group of clamps is opened.

[0015] As a preferred embodiment of the present invention, two arc-shaped clamping plates are symmetrically arranged inside each group of clamps, and the backs of the two arc-shaped clamping plates are fixedly connected to airbags, and the other ends of the two airbags are fixedly connected to the inner wall of the adjacent clamps, and the inner wall of each clamp is provided with a bellows connecting the airbag and the movable cylinder;

[0016] When the movable rod pushes the clamp to close, the bellows is communicated with the movable cylinder.

[0017] As a preferred solution of the present invention, a groove connected to the V-groove is provided on the top of the two brackets, and a limiting mechanism for limiting and fixing the two ends of the rotor is provided in the two grooves. The limiting mechanism includes two guide wheels, two pressure wheels and a lifting assembly for driving the two pressure wheels to rise and fall. The two guide wheels are symmetrically arranged inside the groove and located on both sides of the V-groove. Both ends of the two guide wheels are rotatably connected to the inner wall of the bracket. The lifting assembly is installed inside the groove and located above the V-groove. The two pressure wheels are symmetrically arranged above the two guide wheels and are rotatably connected to the lifting assembly.

[0018] As a preferred solution of the present invention, the lifting assembly includes two electric push rods and a lifting plate, the two electric push rods are respectively installed on both sides of the bottom of the groove, the lifting plate is fixedly installed on the output shafts of the two electric push rods, and a mounting frame is connected between the lifting plate and the pressure wheel, and the pressure wheel is rotatably connected to the mounting frame through a rotating shaft.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention utilizes a control assembly to enable the clamp to close and open, thereby clamping and transporting the rotor. As the drum rotates, the control assembly controls the clamp to open, releasing the rotor. When the clamp closes again, it re-clamps the rotor. This periodic clamping and releasing action ensures smooth and continuous rotor transport during the dynamic balancing test, improving not only the device's automation level but also the accuracy and efficiency of the test.

[0021] 2. Compared to the prior art, the control assembly of the present invention uses gas flow to control the opening and closing of the clamp, reducing interference caused by the operation of electronic equipment and improving the accuracy and stability of the test. Furthermore, the gas connection method is simpler and more reliable than traditional mechanical or electromagnetic control, reducing the complexity and maintenance costs of the device. Furthermore, by controlling the flow and pressure of the gas, the opening and closing of the clamp can be further adjusted to meet the requirements of different rotor dynamic balancing tests, improving test efficiency and accuracy.

[0022] 3. The present invention's L-shaped clamping notch ensures that the bellows can only communicate with the airbag after the active rod pushes the clamp closed, thereby achieving controlled airbag expansion. Furthermore, the airbag's flexibility allows it to better adapt to rotors of varying shapes and sizes, further enhancing the device's versatility and practicality. This not only simplifies the clamping mechanism of the clamp but also improves clamping stability and accuracy, providing a strong guarantee for rotor dynamic balancing testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0024] Figure 1 The present invention provides a schematic diagram of the overall structure of a motor rotor dynamic balancing test device;

[0025] Figure 2 Provides a cross-sectional structural schematic diagram of a control assembly of the present invention;

[0026] Figure 3 A cross-sectional view of the connection structure between the clamp and the telescopic hinge rod is provided for the present invention;

[0027] Figure 4 Provides a schematic diagram of the connection structure between the clamp and the control component of the present invention;

[0028] Figure 5 A top view of the structure of the connecting rod is provided for the present invention;

[0029] Figure 6 Provides a top structural cross-sectional view of the control assembly of the present invention;

[0030] Figure 7 A side structural sectional view of the limiting mechanism is provided for the present invention.

[0031] The numbers in the figure represent the following:

[0032] 1. Base; 2. Support mechanism; 3. Transfer mechanism; 4. Rotating drum; 5. Connecting rod; 6. Clamp; 7. Control assembly; 8. Telescopic hinge rod; 9. Fixed pipe; 10. Gear; 11. Gas pipe;

[0033] 21. Bracket; 22. V-groove; 23. Groove; 24. Guide wheel; 25. Pressure wheel; 26. Electric push rod; 27. Lifting plate; 51. Air guide hole; 52. L-shaped notch; 61. Arc-shaped clamping plate; 62. Air bag; 64. Bellows; 71. Fixed cylinder; 72. Horizontal plate; 73. Vertical plate; 74. Fixed rod; 75. Closed cavity; 76. Air inlet cavity; 77. Air outlet cavity; 78. Air inlet port; 79. Exhaust port; 80. Connecting air pipe; 81. Movable cylinder; 82. Movable rod. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] like Figure 1 - Figure 7 As shown, the present invention provides a motor rotor dynamic balancing test device, including a base 1, a support mechanism 2 fixed on the base 1, and a test mechanism for performing a dynamic balancing test on the rotor (this is the prior art and is not shown in the figure), the support mechanism 2 includes two brackets 21, and a V-groove 22 is opened at the middle position of the top of each bracket 21, and the two V-grooves 22 are symmetrically arranged. A transfer mechanism 3 for transferring and loading the rotor is provided between the two brackets 21, and the transfer mechanism 3 includes a rotating drum 4, a plurality of connecting rods 5, a plurality of groups of clamps 6 for clamping the rotor, and a control component 7 for driving a single group of clamps 6 to open or close. The rotating drum 4 is rotatably arranged between the two brackets 21, and the plurality of support rods are evenly fixed along the circumferential direction on the outer wall of the rotating drum 4, each group of clamps 6 is correspondingly hinged on the plurality of connecting rods 5, and telescopic hinged rods 8 are hinged on both sides of the connecting rods 5, and the ends of all telescopic hinged rods 8 away from the connecting rods 5 are hinged to the outer walls of their adjacent clamps 6, and the control component 7 is installed inside the rotating drum 4.

[0036] Both ends of the rotating drum 4 are connected to fixed tubes 9, and the two fixed tubes 9 are rotatably connected to two brackets 21 respectively. A gear 10 is fixedly connected to the outer wall of one of the fixed tubes 9, and a driving mechanism for driving the gear 10 to rotate is provided on one of the brackets 21.

[0037] When the present invention is in use, the gear 10 is driven to rotate by the driving mechanism, and the gear 10 drives the fixed tube 9 and the drum 4 to rotate. During the rotation of the drum 4, the clamp 6 and the telescopic hinge rod 8 are driven to rotate synchronously through the connecting support rod 5. When the rotor needs to be clamped, the control component 7 controls the clamp 6 to close, clamps the rotor, and then drives the drum 4 to rotate through the driving mechanism to transport the rotor to the testing mechanism for testing. After the test is completed, the control component 7 controls the clamp 6 to open again, releasing the rotor for the next round of loading and testing. The entire transportation process has a high degree of automation, which can greatly improve the efficiency of the motor rotor dynamic balancing test.

[0038] The control assembly 7 includes a fixed cylinder 71, a horizontal plate 72 and a vertical plate 73. The fixed cylinder 71 is movably sleeved inside the rotating cylinder 4. Both ends of the fixed cylinder 71 are fixedly connected to fixed rods 74. The two fixed rods 74 respectively pass through the corresponding fixed tubes 9 and are fixedly connected to the adjacent brackets 21. The horizontal plate 72 is tilted in the middle of the fixed cylinder 71 and is fixedly connected to the inner wall of the fixed cylinder 71. The vertical plate 73 is fixedly set at the middle position of the bottom of the horizontal plate 72 and is fixedly connected to the inner wall of the fixed cylinder 71. The horizontal plate 72 and the vertical plate 73 separate the interior of the fixed cylinder 71 It forms a closed cavity 75, an air inlet cavity 76 and an air outlet cavity 77. An air inlet 78 connecting the air inlet cavity 76 and the rotating drum 4 is provided on one side of the inner wall of the fixed cylinder 71, and an air outlet 79 connecting the air outlet cavity 77 and the rotating drum 4 is provided on the other side of the inner wall of the fixed cylinder 71. A connecting air pipe 80 connecting the air inlet cavity 76 and the air outlet cavity 77 is provided on the vertical plate 73, and a one-way valve is provided inside the connecting air pipe 80. One of the fixed rods 74 is provided with an air supply pipe 11 connected to the air inlet cavity 76, and the other end of the air supply pipe 11 passes through the bracket 21 and extends to the outside of the bracket 21.

[0039] The telescopic hinged rod 8 includes a movable cylinder 81 and a movable rod 82. The bottom end of the movable cylinder 81 is hinged to the connecting support rod 5 through a hinge shaft. The movable rod 82 is axially sealed and slidably connected to the inside of the movable cylinder 81, and the end of the movable rod 82 away from the movable cylinder 81 is hinged to the outer wall of the clamp 6 through a hinge shaft. A reset spring is connected between the movable cylinder 81 and the movable rod 82.

[0040] All connecting rods 5 are provided with air guide holes 51 connected to the interior of the rotating cylinder 4, and an L-shaped notch 52 is connected between the air guide holes 51 and the movable cylinder 81;

[0041] When the air guide hole 51 is connected to the air inlet cavity 76, the gas enters the air guide hole 51 and pushes the movable rod 82 inside the movable cylinder 81 to move, so as to close the group of clamps 6. When the air guide hole 51 is connected to the air outlet cavity 77, the gas inside the air guide hole 51 is discharged, and after the movable rod 82 is reset, the group of clamps 6 is opened.

[0042] The air supply pipe 11 is connected to an external air pipe or air pump, and external high-pressure gas enters the air supply pipe 11 from the outside and is transported to the air inlet chamber 76 through the air supply pipe 11. When the rotating drum 4 rotates, it can drive the connecting rod 5 to rotate until the air guide hole 51 inside the connecting rod 5 is rotated to connect with the air inlet chamber 76. The high-pressure gas inside the air inlet chamber 76 enters the air guide hole 51 through the air inlet 78. By providing an L-shaped notch 52, the high-pressure gas entering the air guide hole 51 enters the movable cylinder 81 through the L-shaped notch 52, thereby pushing the movable rod 82 to move away from the movable cylinder 81. The other end of the movable rod 82 is hinged to the outer wall of the clamp 6 via a hinge shaft. Therefore, the movement of the movable rod 82 drives the clamp 6 to close, thereby tightly holding the rotor.

[0043] When the clamp 6 on the connecting support rod 5 is closed, the drum 4 continues to rotate, and the air guide hole 51 inside the connecting support rod 5 moves away from the air inlet 78 after rotation, and the air inlet cavity 76 is disconnected from the air guide hole 51. At this time, the outer wall of the fixed cylinder 71 around it fits with the inner wall of the drum 4 to close the air inlet 78. When the connecting support rod 5 rotates until the air guide hole 51 inside it is connected to the air outlet cavity 77, the gas in the movable cylinder 81 is discharged through the exhaust port 79, and the movable rod 82 is reset under the action of the reset spring, and the clamp 6 opens accordingly. In this way, as the drum 4 continues to rotate, the clamp 6 will periodically close and open, clamping and transporting the rotor. During the process of the clamp 6 opening, the rotor is released, and when the clamp 6 closes again, it will clamp the rotor again. This periodic clamping and releasing action ensures that the rotor can be transported smoothly and continuously during the dynamic balancing test. In addition, by setting a reset spring, the movable rod 82 can be quickly reset when the air guide hole 51 is connected to the air outlet cavity 77, thereby driving the clamp 6 to open, thereby improving the response speed and stability of the device, which not only improves the degree of automation of the device, but also further improves the accuracy and efficiency of the dynamic balancing test.

[0044] Compared to existing technologies, the control assembly 7 of the present invention uses gas flow to control the opening and closing of the clamp 6, reducing interference caused by the operation of electronic equipment and improving test accuracy and stability. Furthermore, this gas communication method is simpler and more reliable than traditional mechanical or electromagnetic control, reducing device complexity and maintenance costs. Furthermore, by controlling the flow and pressure of the gas, the opening and closing of the clamp 6 can be further adjusted to meet the requirements of different rotor dynamic balancing tests, improving test efficiency and accuracy.

[0045] Two arc-shaped clamping plates 61 are symmetrically arranged inside each set of clamping hoops 6. The backs of the two arc-shaped clamping plates 61 are fixedly connected to airbags 62, and the other ends of the two airbags 62 are fixedly connected to the inner wall of the adjacent clamping hoops 6. The inner wall of each clamping hoop 6 is provided with a bellows 64 connecting the airbag 62 and the movable cylinder 81.

[0046] When the movable rod 82 pushes the clamp 6 to close, the bellows 64 is connected to the movable cylinder 81 .

[0047] When the high-pressure gas pushes the movable rod 82 to move until the clamp 6 closes, the bellows 64 connects to the movable cylinder 81. The high-pressure gas inside the movable cylinder 81 enters the airbag 62 through the bellows 64, causing the airbag 62 to expand rapidly, thereby pushing the two arc-shaped clamping plates 61 toward the rotor and tightly clamping the rotor. This design of clamping the airbag 62 not only improves the stability of the clamping, but also effectively avoids damage to the rotor caused by excessive clamping force. At the same time, the setting of the L-shaped notch 52 ensures that the bellows 64 can only connect to the airbag 62 after the movable rod 82 pushes the clamp 6 to close, thereby achieving control over the expansion of the airbag 62. Furthermore, the flexibility of the airbag 62 can better adapt to rotors of different shapes and sizes, further improving the versatility and practicality of the device. During the opening of the clamp 6, the gas in the airbag 62 will be discharged through the bellows 64, and the arc-shaped clamping plates 61 will then reset, ready for the next clamping action. The cooperation between the airbag 62 and the two arc-shaped clamping plates 61 not only improves the stability and accuracy of the clamping of the two arc-shaped clamping plates 61 , but also provides a strong guarantee for the dynamic balance test of the rotor.

[0048] The tops of the two brackets 21 are each provided with a groove 23 that is connected to the V-groove 22, and the two grooves 23 are each provided with a limiting mechanism for limiting and fixing the two ends of the rotor. The limiting mechanism includes two guide wheels 24, two pressure wheels 25 and a lifting assembly for driving the two pressure wheels 25 to rise and fall. The two guide wheels 24 are symmetrically arranged inside the groove 23 and are located on both sides of the V-groove 22. Both ends of the two guide wheels 24 are rotatably connected to the inner wall of the bracket 21. The lifting assembly is installed inside the groove 23 and is located above the V-groove 22. The two pressure wheels 25 are symmetrically arranged above the two guide wheels 24 and are rotatably connected to the lifting assembly.

[0049] The lifting assembly includes two electric push rods 26 and a lifting plate 27. The two electric push rods 26 are respectively installed on both sides of the bottom of the groove 23. The lifting plate 27 is fixedly installed on the output shafts of the two electric push rods 26. A mounting frame is connected between the lifting plate 27 and the pressure wheel 25. The pressure wheel 25 is rotatably connected to the mounting frame through a rotating shaft.

[0050] During use, after the rotor is transferred to the top of the bracket 21, the two brackets 21 are pushed closer to each other by the screw slide, and the two ends of the rotor are placed in the V-groove 22. At this time, the bottom of the rotor contacts the outer walls of the two guide wheels 24, so that the rotor can be stably placed along the direction of the V-groove 22. Subsequently, the electric push rod 26 is started, pushing the lifting plate 27 down, thereby driving the mounting frame and the pressure wheel 25 to descend. The pressure wheel 25 will gradually approach the rotor during the descent process, and eventually press against the two ends of the top of the rotor to achieve limited fixation of the rotor. The setting of the guide wheel 24 not only guides the rotation of the rotor, but also reduces the wear between the rotor and the bracket 21 through its rolling friction, thereby ensuring the accuracy of the test and the service life of the rotor.

[0051] By controlling the extension and retraction of the electric push rod 26, the pressure applied to the pressure wheel 25 can be adjusted, thereby meeting the requirements for securing rotors of different specifications during testing. By providing a limiting mechanism, the present invention achieves stable and accurate rotor positioning, providing strong support for dynamic balancing tests of motor rotors. This limiting method is not only stable and reliable, but also prevents rotor shaking or deviation during testing, thereby improving test accuracy.

[0052] The scope of protection of the application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and scope of protection of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the scope of protection of the present application.

Claims

1. A motor rotor dynamic balance test device, comprising a base (1), a support mechanism (2) fixed to the base (1), and a test mechanism for performing a dynamic balance test on the rotor, characterized in that: The support mechanism (2) includes two brackets (21), and a V-shaped groove (22) is provided at the middle position of the top of each of the two brackets (21), and the two V-shaped grooves (22) are symmetrically arranged. A transfer mechanism (3) for transferring and loading the rotor is provided between the two brackets (21), and the transfer mechanism (3) includes a rotating drum (4), a plurality of connecting rods (5), a plurality of groups of clamps (6) for clamping the rotor, and a control component (7) for driving a single group of clamps (6) to open or close. The rotating drum (4) is rotatably arranged between the two brackets (21), and a plurality of the connecting rods (5) are evenly fixedly arranged on the outer wall of the rotating drum (4) along the circumferential direction. Each group of the clamps (6) is correspondingly hinged on a plurality of connecting rods (5). Both sides of the connecting rods (5) are hinged with telescopic hinged rods (8), and the ends of all the telescopic hinged rods (8) away from the connecting rods (5) are hinged to the outer walls of the adjacent clamps (6). The control component (7) is installed inside the rotating drum (4); The control assembly (7) includes a fixed cylinder (71), a horizontal plate (72) and a vertical plate (73). The fixed cylinder (71) is movably sleeved inside the rotating cylinder (4). Both ends of the fixed cylinder (71) are fixedly connected to fixed rods (74). The two fixed rods (74) respectively penetrate the corresponding fixed tubes (9) and are fixedly connected to the adjacent brackets (21). The horizontal plate (72) is tilted and arranged in the middle of the fixed cylinder (71) and is fixedly connected to the inner wall of the fixed cylinder (71). The vertical plate (73) is fixedly arranged at the middle position of the bottom of the horizontal plate (72) and is fixedly connected to the inner wall of the fixed cylinder (71). The horizontal plate (72) and the vertical plate (73) divide the inner part of the fixed cylinder (71) into two parts. The fixed cylinder (71) is divided into a closed cavity (75), an air inlet cavity (76) and an air outlet cavity (77). An air inlet (78) communicating with the air inlet cavity (76) and the rotating cylinder (4) is provided on one side of the inner wall of the fixed cylinder (71). An air outlet (79) communicating with the air outlet cavity (77) and the rotating cylinder (4) is provided on the other side of the inner wall of the fixed cylinder (71). A connecting air pipe (80) communicating with the air inlet cavity (76) and the air outlet cavity (77) is provided on the vertical plate (73). A one-way valve is provided inside the connecting air pipe (80). An air supply pipe (11) communicating with the air inlet cavity (76) is provided inside one of the fixed rods (74). The other end of the air supply pipe (11) passes through the bracket (21) and extends to the outside of the bracket (21).

2. The motor rotor dynamic balancing test device according to claim 1, characterized in that: Both ends of the rotating drum (4) are connected to fixed tubes (9), and the two fixed tubes (9) are rotatably connected to two brackets (21) respectively. A gear (10) is fixedly connected to the outer wall of one of the fixed tubes (9), and a driving mechanism for driving the gear (10) to rotate is provided on one of the brackets (21).

3. The motor rotor dynamic balancing test device according to claim 1, characterized in that: The telescopic hinged rod (8) comprises a movable cylinder (81) and a movable rod (82), the bottom end of the movable cylinder (81) is hinged to the connecting support rod (5) via a hinge shaft, the movable rod (82) is axially sealed and slidably connected to the inside of the movable cylinder (81), and the end of the movable rod (82) away from the movable cylinder (81) is hinged to the outer wall of the clamp (6) via a hinge shaft, and a return spring is connected between the movable cylinder (81) and the movable rod (82).

4. The motor rotor dynamic balancing test device according to claim 3, characterized in that: All the connecting rods (5) are provided with air guide holes (51) communicating with the interior of the rotating cylinder (4), and an L-shaped notch (52) is connected between the air guide holes (51) and the movable cylinder (81); When the air guide hole (51) is connected to the air inlet cavity (76), gas enters the air guide hole (51) and pushes the movable rod (82) inside the movable cylinder (81) to move, so as to close the group of clamps (6); when the air guide hole (51) is connected to the air outlet cavity (77), the gas inside the air guide hole (51) is discharged, and after the movable rod (82) is reset, the group of clamps (6) is opened.

5. The motor rotor dynamic balancing test device according to claim 4, characterized in that: Two arc-shaped clamping plates (61) are symmetrically arranged inside each group of the clamping hoops (6), and the backs of the two arc-shaped clamping plates (61) are fixedly connected to air bags (62), and the other ends of the two air bags (62) are fixedly connected to the inner walls of the adjacent clamping hoops (6), and the inner wall of each clamping hoops (6) is provided with a bellows (64) connecting the air bags (62) and the movable cylinder (81); When the movable rod (82) pushes the clamp (6) to close, the bellows (64) is connected to the movable cylinder (81).

6. The motor rotor dynamic balancing test device according to claim 1, characterized in that: The tops of the two brackets (21) are each provided with a groove (23) connected to the V-groove (22), and a limiting mechanism for limiting and fixing the two ends of the rotor is provided in the two grooves (23), the limiting mechanism comprising two guide wheels (24), two pressure wheels (25) and a lifting assembly for driving the two pressure wheels (25) to move up and down, the two guide wheels (24) are symmetrically arranged inside the groove (23) and located on both sides of the V-groove (22), both ends of the two guide wheels (24) are rotatably connected to the inner wall of the bracket (21), the lifting assembly is installed inside the groove (23) and located above the V-groove (22), the two pressure wheels (25) are symmetrically arranged above the two guide wheels (24) and are rotatably connected to the lifting assembly.

7. The motor rotor dynamic balancing test device according to claim 6, characterized in that: The lifting assembly comprises two electric push rods (26) and a lifting plate (27). The two electric push rods (26) are respectively mounted on both sides of the bottom of the groove (23). The lifting plate (27) is fixedly mounted on the output shafts of the two electric push rods (26). A mounting frame is connected between the lifting plate (27) and the pressing wheel (25). The pressing wheel (25) is rotatably connected to the bracket (21) via a rotating shaft.

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