CN118746395A - A dynamic balance test device - Google Patents

Abstract

The invention relates to the technical field of motor rotor testing, in particular to a dynamic balance testing device which comprises a rotor bracket, a detection head, a barrel type counterweight mechanism and a compression driving mechanism, wherein the barrel type counterweight mechanism comprises a sleeve and two arc-shaped sliding blocks, rubber rings are embedded into two ends of the sleeve, counterweight rings are coaxially formed on the outer walls of the two ends of the sleeve, positioning rings are coaxially formed on the sides of the counterweight rings, scale rings are coaxially formed on the sides of the positioning rings, a circle of annular grooves are formed in the counterweight rings, a rotor positioning mechanism is arranged on the sides of the detection head, slots are formed in the positioning rings, the rotor positioning mechanism comprises a telescopic rod, the compression driving mechanism comprises a transmission belt, a sleeve is sleeved outside the rotor before the rotor is tested, the sleeve of the dynamic balance testing device has uniform weight, and when the sleeve is subjected to counterweight, the counterweight plates are additionally arranged on the arc-shaped sliding blocks in the sleeve and can be fixedly connected with the sleeve, so that when the rotor is multiplexed, the counterweight plates cannot be thrown out by high-speed rotation of the rotor.

Description

A dynamic balance test device

Technical Field

The invention relates to the technical field of motor rotor testing, and in particular to a dynamic balance testing device.

Background Art

The purpose of dynamic balancing is to ensure that the moving object can maintain a stable balance state during high-speed rotation or vibration, so as to improve its performance and service life, and reduce unnecessary losses and risks. This detection process is widely used in various fields such as mechanical equipment, vehicles and aircraft. There are many methods for dynamic balancing, including static balancing, dynamic balancing, excitation, vibration analysis and current detection. Among them, when the motor rotor is wound, the number of coils in one circle of the rotor is difficult to balance, and the weight of the permanent magnet blocks on the outer periphery of the rotor may also be inconsistent. Therefore, when the motor rotor rotates, the weight of some parts will cause centrifugal force, which will eventually cause the motor rotor to vibrate. Over time, the bearings connected to the motor rotor will produce friction between the inner and outer rings due to the vibration of the motor rotor, which will eventually reduce the service life of the bearings. Therefore, after the motor rotor is produced, it is necessary to perform a sampling dynamic balancing test on the motor rotor.

The existing Chinese invention patent application with publication number CN115683454A discloses a micromotor rotor dynamic balance detection device, but it also has the following defects:

First, the above patent can only detect whether the current motor rotor has dynamic balance defects, but cannot level the unbalanced rotor after detection;

Secondly, when the traditional detection device is leveling the rotor, it is unable to determine the approximate location of the heavier part of the motor rotor. Therefore, during the leveling process, it is necessary to continuously add weights to the rotor for circle-by-circle testing, which will ultimately greatly increase the test time and reduce the test efficiency.

Third, since permanent magnets are provided on the outer periphery of the rotor, when adding counterweight to the rotor, a magnet is traditionally used to be adsorbed on the permanent magnet to increase the weight of the rotor. However, when the rotor is retested, the high-speed rotation of the rotor may cause the magnet to be misplaced or directly thrown out, which will eventually affect the normal progress of the test. In addition, there is a gap between adjacent permanent magnets, so the magnet cannot be fixed between two permanent magnets. Then, when the heavier part of the rotor happens to be between adjacent permanent magnets, the magnet cannot be fixed by the above method.

Therefore, it is necessary to provide a dynamic balance test device to solve the above problems.

Summary of the invention

Based on this, it is necessary to provide a dynamic balancing test device to address the existing technical problems.

In order to solve the problems of the prior art, the technical solution adopted by the present invention is: a dynamic balancing test device, including a rotor support, a detection head, a cylinder-type counterweight mechanism and a clamping drive mechanism, the rotor is placed horizontally on the rotor support, the rotor support includes two groups of roller members respectively used to lift the rotating shafts at both ends of the rotor upward, the detection head is fixedly arranged on the side of the rotor support, the output light of the detection head is downward facing the end of the rotor, the cylinder-type counterweight mechanism includes a sleeve and two arc-shaped sliders, rubber rings are embedded in both ends of the sleeve, the sleeve is coaxially sleeved outside the rotor, and the sleeve is tightly connected to the outer ring of the rotor through the two rubber rings, and the outer walls at both ends of the sleeve are coaxially formed with A counterweight ring, a positioning ring is coaxially formed on the side of the counterweight ring, a scale ring is coaxially formed on the side of the positioning ring, a circle of annular groove is arranged in the counterweight ring, a notch connected to the annular groove is arranged on the outer wall of the counterweight ring, each arc-shaped slider slides into the corresponding annular groove through the notch, each arc-shaped slider is provided with a locking piece for pressing the arc-shaped slider and the counterweight ring, a rotor positioning mechanism is arranged on the side of the detection head, a slot is arranged on the positioning ring, the rotor positioning mechanism includes a telescopic rod inserted vertically downward into the slot, a clamping drive mechanism is arranged between two groups of roller parts, and the clamping drive mechanism includes a transmission belt pressed downward on the sleeve and used to drive the rotor to rotate.

Furthermore, the rotor support also includes two symmetrical support blocks, which are spaced apart in the horizontal direction. Two groups of roller members are respectively arranged on the two support blocks. Each group of roller members includes two symmetrical wheels. The two wheels rotate at the upper ends of the corresponding support blocks. The axial direction of each wheel is parallel to the spacing direction of the two support blocks, and the two wheels are located on the same side of the support block. The top of each support block is provided with an avoidance groove located between the two wheels.

Furthermore, the clamping drive mechanism also includes a rotating arm, an elastic tensioning member, a fastener, a motor and a belt supply sliding member, wherein a vertical upright pole is fixedly provided on the side of one of the support blocks, a upright block is formed on the top of the upright pole, the rotating arm is hook-shaped and arranged between the two support blocks, the two ends of the rotating arm are respectively a hinged end and a free end, the rotating arm has two end angles, the hinged end of the rotating arm is hinged to the upright block, the belt supply sliding member includes two fixed pulleys and three free pulleys, a vertical plate is fixed between the two support blocks, the two fixed pulleys are spaced apart and rotate on the vertical plate, the three free pulleys rotate on the free end and the two end angles of the rotating arm respectively, the motor is horizontally fixed to one side of the vertical plate, the output end of the motor is coaxially fixedly connected to one of the fixed pulleys, the transmission belt is sleeved on the two fixed pulleys and the three free pulleys, the elastic tensioning member is used to tighten the transmission belt outward, and the fastener is used to fix the free end of the rotating arm to the vertical plate.

Furthermore, the elastic tensioning member includes a strip fixing seat, a rectangular slider and a spring. A No. 1 strip through groove is provided on one of the end corners of the rotating arm. The strip fixing seat is fixedly arranged on one side of the rotating arm. A No. 2 strip through groove parallel to the No. 1 strip through groove is provided on the strip fixing seat. The rectangular slider slides in the No. 2 strip through groove. A driving shaft is coaxially fixed to one of the free pulleys. One end of the driving shaft passes through the No. 1 strip through groove and the No. 2 strip through groove in sequence and is rotatably connected to the rectangular slider. Baffles are respectively fixed at both ends of the strip fixing seat. The spring is fixed in the No. 2 strip through groove. Both ends of the spring respectively conflict with the rectangular slider and one of the baffles.

Furthermore, the fastener includes a fixed shaft and a screw cap. The fixed shaft is formed on one side of the free end of the rotating arm, and the fixed shaft is perpendicular to the rotating arm. An arc-shaped through groove is opened on the vertical plate, and the fixed shaft passes through the arc-shaped through groove. One end of the fixed shaft is threaded, and the screw cap is screwed on the threaded end of the fixed shaft.

Furthermore, a mounting seat is fixedly provided on the top of the vertical pole, a vertical flexible curved rod is provided in the mounting seat, and the detection head is fixedly provided on the top of the flexible curved rod.

Furthermore, a transverse support rod is formed on the vertical block, a vertical strip socket is fixed on the end of the transverse support rod, the telescopic rod slides in the strip socket, a vertical No. 3 strip through slot is opened on one side of the strip socket, a limit pin is formed on the telescopic rod and horizontally passes through the No. 3 strip through slot, the end of the limit pin is threaded, and a No. 1 fastening nut is screwed on the threaded end of the limit pin.

Furthermore, the cross-section of each annular groove and the arc-shaped slider is an inverted T-shape, and each locking member includes a threaded pin, a No. 2 fastening nut and a pressure plate. The threaded pin is formed at the top of the arc-shaped slider, and the threaded pin is perpendicular to the arc-shaped slider. The pressure plate is arranged at the top of the arc-shaped slider, and the threaded pin passes through the pressure plate, and the No. 2 fastening nut is screwed onto the threaded pin.

Furthermore, a magnetic sheet facing the notch is fixedly provided on the inner wall of each annular groove, each arc-shaped slider is made of iron, and two symmetrical counterweight blocks are formed on the circumference of each slot.

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

First, before the rotor is tested, a sleeve is installed outside the rotor. The weight of the sleeve of the device is uniform. When the sleeve is weighted, the weight plate is installed on the arc-shaped slider in the sleeve, and the arc-shaped slider can be tightly connected with the sleeve. In this way, when the rotor is retested, the high-speed rotation of the rotor will not throw out the weight plate;

Secondly, the rotation speed of the rotor is constant during the test. The angular velocity of the rotor can be obtained through the conversion formula of angular velocity and rotation speed ω=n*π/30. After the angular velocity of the rotor is determined, the calculation formula of angular velocity ω=|Δθ|÷Δt can be used to obtain |Δθ|=ω*Δt. Since ω is a fixed value, the value of |Δθ| can be finally obtained by calculating Δt. When the rotor rotates, the display will show the ripples of rotor vibration. When the rotor vibrates, the ripples begin to fluctuate violently. At this time, the display will show the time difference from the start of the rotor rotation to the start of the ripples. Substituting this time difference into |Δθ|=ω*Δt can obtain the value of |Δθ|. Since the slot on the positioning ring faces upward before the rotor rotates, the value of |Δθ| at this time is the angle between the heavier part of the rotor and the slot on the positioning ring. Finally, the position of the heavier part of the rotor can be obtained.

Third, after testing, the position of the heavier part on the rotor can be determined, and then the weight of the rotor can be leveled by rotating the arc-shaped slider. Compared with the traditional method of adding a magnet to the permanent magnet, the arc-shaped slider can stay at any position in the annular groove, so that the leveling of the rotor weight is more accurate.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a three-dimensional structure of an embodiment;

FIG2 is a partial enlarged schematic diagram indicated by A1 in FIG1 ;

FIG3 is a partial enlarged schematic diagram indicated by A2 in FIG1 ;

FIG4 is a partial enlarged schematic diagram indicated by A3 in FIG1 ;

FIG5 is a partial enlarged schematic diagram indicated by A4 in FIG1 ;

FIG6 is a second schematic diagram of the three-dimensional structure of the embodiment;

FIG7 is a schematic diagram of the three-dimensional structure of the rotating arm;

FIG8 is a perspective exploded view of the rotating arm and the bar-shaped fixing seat;

FIG9 is a top view of the sleeve;

Fig. 10 is a cross-sectional view along line A-A of Fig. 9;

FIG11 is a partial enlarged schematic diagram indicated by A5 in FIG10 ;

FIG. 12 is a schematic diagram of the three-dimensional structure of the sleeve.

The numbers in the figure are: 1, detection head; 2, sleeve; 3, arc-shaped slider; 4, rubber ring; 5, counterweight ring; 6, positioning ring; 7, scale ring; 8, annular groove; 9, notch; 10, slot; 11, telescopic rod; 12, transmission belt; 13, support block; 14, rotating wheel; 15, avoidance groove; 16, rotating arm; 17, motor; 18, vertical rod; 19, vertical block; 20, hinged end; 21, free end; 22, fixed pulley; 23, free pulley; 24, vertical plate; 25, strip shaped fixing seat; 26, rectangular slider; 27, spring; 28, No. 1 strip through slot; 29, No. 2 strip through slot; 30, driving shaft; 31, baffle; 32, fixed shaft; 33, screw cap; 34, arc-shaped through slot; 35, mounting seat; 36, flexible bent rod; 37, horizontal support rod; 38, strip socket; 39, No. 3 strip through slot; 40, limit pin; 41, No. 1 fastening nut; 42, threaded pin; 43, No. 2 fastening nut; 44, pressing plate; 45, magnetic plate; 46, counterweight.

DETAILED DESCRIPTION

In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

Referring to a dynamic balancing test device shown in FIGS. 1 to 12, the device includes a rotor support, a detection head 1, a cylinder-type counterweight mechanism and a clamping drive mechanism. The rotor is placed horizontally on the rotor support, and the rotor support includes two groups of roller members respectively used to lift the rotating shafts at both ends of the rotor upward. The detection head 1 is fixedly arranged on the side of the rotor support, and the output light of the detection head 1 is downwardly facing the end of the rotor. The cylinder-type counterweight mechanism includes a sleeve 2 and two arc-shaped sliders 3. Rubber rings 4 are embedded in both ends of the sleeve 2. The sleeve 2 is coaxially sleeved outside the rotor, and the sleeve 2 is tightly connected to the outer ring of the rotor through the two rubber rings 4. Counterweight rings 5 are coaxially formed on the outer walls at both ends of the sleeve 2, and the side of the counterweight ring 5 is coaxial. A positioning ring 6 is formed, and a scale ring 7 is coaxially formed on the side of the positioning ring 6. A circle of annular grooves 8 are provided in the counterweight ring 5, and a notch 9 connected to the annular groove 8 is provided on the outer wall of the counterweight ring 5. Each arc-shaped slider 3 slides into the corresponding annular groove 8 through the notch 9. Each arc-shaped slider 3 is provided with a locking piece for pressing the arc-shaped slider 3 and the counterweight ring 5. A rotor positioning mechanism is provided on the side of the detection head 1, and a slot 10 is provided on the positioning ring 6. The rotor positioning mechanism includes a telescopic rod 11 vertically inserted into the slot 10 downwardly, and a clamping drive mechanism is arranged between two groups of roller members. The clamping drive mechanism includes a transmission belt 12 that is pressed downward on the sleeve 2 and is used to drive the rotor to rotate.

Before the test, the sleeve 2 is coaxially sleeved on the outside of the rotor. During this process, the sleeve 2 is tightly connected to the outer wall of the rotor through the rubber rings 4 at both ends, so that the sleeve 2 and the rotor can be regarded as one. After the sleeve 2 is sleeved on the outside of the rotor, the rotating shafts at both ends of the rotor are respectively placed on two sets of roller parts, and then the sleeve 2 is rotated so that the notch 9 on one of the positioning rings 6 faces upward and faces the telescopic rod 11, and then the telescopic rod 11 is moved down to the lower end of the telescopic rod 11 and inserted into the slot 10 on the positioning ring 6. At this time, the sleeve 2 cannot rotate due to the limit of the telescopic rod 11, and then the position of the detection head 1 is adjusted so that the output light of the detection head 1 faces downward on the rotating shaft at one end of the rotor, and finally the transmission belt 12 is pressed downward on the sleeve 2. When the transmission belt 12 presses the rotor tightly against the rotor bracket, the telescopic rod 11 is moved downward. 11 moves up to separate the lower end of the telescopic rod 11 from the slot 10, and then the sleeve 2 and the rotor are driven to rotate synchronously through the transmission belt 12. Due to the uneven distribution of the windings on the rotor and the uneven weight of the permanent magnet blocks, the rotor will vibrate due to the centrifugal force when rotating. Then the detection head 1 is used to monitor the amplitude of the rotor during rotation in real time. The data measured by the detection head 1 will be displayed on the display in a combination of numerical values and ripples. When the rotor vibrates, the amplitude ripples displayed on the display will have obvious fluctuations. Among them, the sleeve 2 is made of light material, and the weight of the entire sleeve 2 is uniform. When the rotor rotates for the first time, the arc slider 3 is not installed in the annular groove 8, so the sleeve 2 itself will not vibrate due to the centrifugal force, and the display shows the amplitude of the rotor itself.

When the weight on the rotor is uneven, the rotor will vibrate due to centrifugal force. In order to facilitate the subsequent weight balancing of the rotor, it is also necessary to calculate the approximate position of the rotor with the largest weight. The specific calculation process is as follows:

The speed of the rotor is constant during the test. The speed of the rotor can be measured by a speed tester. The angular speed of the rotor can be obtained through the conversion formula of angular speed and speed ω=n*π/30 (ω is the angular speed, n is the speed), and the angular speed of the rotor is also a constant value. After the angular speed of the rotor is determined, according to the calculation formula of angular speed ω=|Δθ|÷Δt (|Δθ| is the angle of rotation of a certain point on the rotor, and Δt is the time required for a certain point on the rotor to rotate to |Δθ|), |Δθ|=ω*Δt can be obtained. Since ω is a fixed value, the value of |Δθ| can be finally obtained by calculating Δt. The rotor rotates clockwise by default. When the rotor rotates, the display will show the ripples of rotor vibration. When the rotor vibrates, the ripples begin to fluctuate violently. At this time, the display will show the time difference from the start of the rotor rotation to the start of the ripples. Substituting this time difference into |Δθ|=ω*Δt can get the value of |Δθ|. Since the slot 10 on the positioning ring 6 is facing upward before the rotor rotates, then at this time The value of |Δθ| is the angle between the heavier part of the rotor and the slot 10 on the positioning ring 6. Finally, the position of the heavier part of the rotor can be obtained. After that, the transmission belt 12 is separated from the sleeve 2, and each arc-shaped slider 3 is slid into the annular groove 8 through the corresponding notch 9. Then, the two arc-shaped sliders 3 are slid to the opposite side of the heavier part of the rotor through the scale ring 7 at the end of the sleeve 2. That is to say, the angle between the final positioning position of the arc-shaped slider 3 and the position of the heavier part of the rotor is 180°. Then, the arc-shaped slider 3 is fixed to the sleeve 2 through the locking piece. Since the arc-shaped slider 3 itself has weight, The rotor is balanced by the weight of the arc-shaped slider 3, and then the rotor is tested again. If the ripple amplitude displayed on the display has no obvious fluctuation, the balance adjustment of the rotor is completed. If the ripple displayed on the display still has obvious fluctuation, it means that the weight of the arc-shaped slider 3 is insufficient. Then, the weight of the arc-shaped slider 3 can be increased by adding weight plates to the arc-shaped slider 3. Among them, the two arc-shaped sliders 3 are in a symmetrical state. If the adjacent wave peaks in the ripples displayed on the display are not much different, it means that there is only one part with a heavier weight on the rotor. In this case, when adjusting the position of the arc-shaped slider 3, the two arc-shaped sliders 3 need to be adjusted. The two arc-shaped sliders 3 are on the same straight line. If the adjacent wave peaks in the ripples displayed on the display are greatly different, it means that there are multiple heavy parts on the rotor. In this case, when adjusting the position of the arc-shaped slider 3, the positions of the two arc-shaped sliders 3 may be staggered. Finally, the weight of the rotor is balanced by the two arc-shaped sliders 3. When the test is completed, the position of the current arc-shaped slider 3 is marked on the rotor, and then the sleeve 2 is removed. The rotor is then processed and the corresponding weight is increased at the marked position of the rotor. The weight increase of the rotor can be achieved by replacing a heavier permanent magnet block or welding a counterweight.

In order to show the specific structure of the rotor bracket, the following features are set:

The rotor support also includes two symmetrical support blocks 13, which are spaced apart in the horizontal direction. Two groups of roller members are respectively arranged on the two support blocks 13, and each group of roller members includes two symmetrical running wheels 14. The two running wheels 14 rotate at the upper ends of the corresponding support blocks 13. The axial direction of each running wheel 14 is parallel to the spacing direction of the two support blocks 13, and the two running wheels 14 are located on the same side of the support block 13. The top of each support block 13 is provided with an avoidance groove 15 located between the two running wheels 14.

When placing the rotor, make the rotor horizontal, then place the rotating shafts at both ends of the rotor downward between the corresponding two wheels 14, and lift the two rotating shafts of the rotor through the four wheels 14. When the rotor is placed on the rotor support, the iron core in the rotor is located between the two support blocks 13. The iron core of the rotor consists of a core barrel and a plurality of permanent magnet blocks, and the plurality of permanent magnet blocks are evenly distributed along the circumferential direction of the core barrel. When the sleeve 2 is installed, the sleeve 2 is coaxially installed outside the plurality of permanent magnet blocks.

In order to show the specific structure of the clamping drive mechanism, the following features are set:

The clamping drive mechanism also includes a rotating arm 16, an elastic tensioning member, a fastener, a motor 17 and a belt supply sliding member, wherein a vertical pole 18 is fixedly provided on the side of one of the support blocks 13, and a vertical block 19 is formed on the top of the vertical pole 18. The rotating arm 16 is hook-shaped and arranged between the two support blocks 13. The two ends of the rotating arm 16 are respectively a hinged end 20 and a free end 21. The rotating arm 16 has two end angles. The hinged end 20 of the rotating arm 16 is hinged to the vertical block 19. The belt supply sliding member includes two fixed pulleys 22 and three free pulleys 23. The two support blocks A vertical plate 24 is fixed between the vertical plate 24, two fixed pulleys 22 are distributed at intervals and rotate on the vertical plate 24, three free pulleys 23 rotate on the free end 21 and two end angles of the rotating arm 16 respectively, the motor 17 is horizontally fixed to one side of the vertical plate 24, the output end of the motor 17 is coaxially connected to one of the fixed pulleys 22, the transmission belt 12 is sleeved on the two fixed pulleys 22 and the three free pulleys 23, the elastic tightening member is used to tighten the transmission belt 12 outward, and the fastener is used to fix the free end 21 of the rotating arm 16 to the vertical plate 24.

After the rotor is placed on the rotor support, the entire rotating arm 16 is rotated by pushing the free end 21 of the rotating arm 16 downward. During this process, the transmission belt 12 between the free pulley 23 and one of the fixed pulleys 22 on the free end 21 of the rotating arm 16 will be pressed downward on the sleeve 2, as shown in Figure 6. Finally, the sleeve 2 will press the rotating shafts at both ends of the rotor to the two groups of roller parts respectively. After the transmission belt 12 is pressed on the sleeve 2, the free end 21 of the rotating arm 16 is fixed to the vertical plate 24 by fasteners, and then the motor 17 is started. When the motor 17 is started, the motor 17 will drive one of the fixed pulleys 22 to rotate, and finally the transmission belt 12 will drive the rotor to rotate through the sleeve 2, wherein the elastic tensioning member is used to ensure that the transmission belt 12 is always in a taut state, thereby ensuring that the transmission belt 12 can press the rotor downward.

In order to show the specific structure of the elastic tensioner, the following features are set:

The elastic tensioning member includes a strip fixing seat 25, a rectangular slider 26 and a spring 27. A first strip through groove 28 is provided on one of the end corners of the rotating arm 16. The strip fixing seat 25 is fixedly arranged on one side of the rotating arm 16. A second strip through groove 29 parallel to the first strip through groove 28 is provided on the strip fixing seat 25. The rectangular slider 26 slides in the second strip through groove 29. A driving shaft 30 is coaxially fixedly connected to one of the free pulleys 23. One end of the driving shaft 30 passes through the first strip through groove 28 and the second strip through groove 29 in sequence and is rotatably connected to the rectangular slider 26. Baffles 31 are respectively fixedly arranged at both ends of the strip fixing seat 25. The spring 27 is fixed in the second strip through groove 29. The two ends of the spring 27 respectively conflict with the rectangular slider 26 and one of the baffles 31.

The spring 27 releases its elastic force to push the rectangular slider 26 outward, so that the drive shaft 30 connected to the rectangular slider 26 for rotation will drive the corresponding free pulley 23 to push outward, and finally the transmission belt 12 will be tightened outward through one of the free pulleys 23. During the downward rotation of the rotating arm 16, the transmission belt 12 will be pressed on the sleeve 2. At this time, the transmission belt 12 will become tighter and tighter. Then the transmission belt 12 will drive the rectangular slider 26 to compress the spring 27 through one of the free pulleys 23, so that the transmission belt 12 can always be in a taut state during the process of pressing the sleeve 2.

In order to show the specific structure of the fastener, the following features are set:

The fastener includes a fixed shaft 32 and a screw cap 33. The fixed shaft 32 is formed on one side of the free end 21 of the rotating arm 16, and the fixed shaft 32 is perpendicular to the rotating arm 16. An arc-shaped through groove 34 is opened on the vertical plate 24, and the fixed shaft 32 passes through the arc-shaped through groove 34. One end of the fixed shaft 32 is threaded, and the screw cap 33 is screwed on the threaded end of the fixed shaft 32.

When the rotating arm 16 is rotated downward, the fixed shaft 32 provided on the free end 21 of the rotating arm 16 will slide downward into the arc-shaped through groove 34. Then, when the transmission belt 12 is pressed against the sleeve 2, the free end 21 of the rotating arm 16 cannot drop again. At this time, the fixed shaft 32 is locked on the vertical plate 24 by the screw cap 33, and finally the free end 21 of the rotating arm 16 is fixed.

In order to show how to install the detection head 1 and how to adjust the detection head 1, the following features are set:

A mounting seat 35 is fixedly provided on the top of the vertical pole 18 . A vertical flexible curved rod 36 is provided inside the mounting seat 35 . The detection head 1 is fixedly provided on the top of the flexible curved rod 36 .

The flexible curved rod 36 has a bendable property, and the position of the detection head 1 is adjusted by the flexible curved rod 36, so that the output light of the detection head 1 can face the end of the rotor downward. The flexible curved rod 36 can be a gooseneck tube.

In order to show how to install the telescopic rod 11, the following features are provided:

A transverse support rod 37 is formed on the vertical block 19, and a vertical strip socket 38 is fixed on the end of the transverse support rod 37. The telescopic rod 11 slides in the strip socket 38. A vertical No. 3 strip through groove 39 is opened on one side of the strip socket 38. A limit pin 40 is formed on the telescopic rod 11 and horizontally passes through the No. 3 strip through groove 39. The end of the limit pin 40 is threaded, and a No. 1 fastening nut 41 is screwed on the threaded end of the limit pin 40.

After loosening the No. 1 fastening nut 41, the telescopic rod 11 is in an active state, so that the downward extension length of the telescopic rod 11 can be adjusted, and finally the lower end of the telescopic rod 11 is inserted downward into the slot 10. When the sleeve 2 is positioned, the telescopic rod 11 is pushed upward, and then the No. 1 fastening nut 41 is tightened, so that the telescopic rod 11 will be fixed in the strip socket 38 to ensure that the telescopic rod 11 will not fall down by itself when the rotor rotates.

In order to show the specific structure of the locking piece, the following features are set:

The cross-section of each annular groove 8 and the arc-shaped slider 3 is an inverted T-shape, and each locking member includes a threaded pin 42, a No. 2 fastening nut 43 and a pressing plate 44. The threaded pin 42 is formed on the top of the arc-shaped slider 3, and the threaded pin 42 is perpendicular to the arc-shaped slider 3. The pressing plate 44 is arranged on the top of the arc-shaped slider 3, and the threaded pin 42 passes through the pressing plate 44. The No. 2 fastening nut 43 is screwed onto the threaded pin 42.

When the No. 2 fastening nut 43 is rotated downward, the No. 2 fastening nut 43 will drive the pressure plate 44 to press against the outer wall of the counterweight ring 5, thereby limiting the sliding of the arc-shaped slider 3 in the annular groove 8 through the interference between the pressure plate 44 and the outer wall of the counterweight ring 5. When it is necessary to add a counterweight plate to the arc-shaped slider 3, the No. 2 fastening nut 43 is screwed upward, and then the counterweight plate is successively put downward on the threaded pin 42, and finally the No. 2 fastening nut 43 is screwed downward on the threaded pin 42.

Since the notch 9 and the slot 10 are respectively provided on the counterweight ring 5 and the positioning ring 6, the following features are provided in order to balance the weight of the counterweight ring 5 and the positioning ring 6:

A magnetic sheet 45 facing the notch 9 is fixedly disposed on the inner wall of each annular groove 8 , each arc-shaped slider 3 is made of iron, and two symmetrical counterweights 46 are formed on the circumference of each slot 10 .

Since there is only one notch 9 on each counterweight ring 5, the entire counterweight ring 5 will be unbalanced in weight due to the notch 9, which will affect the dynamic balancing test of the rotor. Therefore, a magnetic sheet 45 is installed on the inner wall of the annular groove 8. The weight of the magnetic sheet 45 is consistent with the weight lost in the notch 9 in the counterweight ring 5. The weight of the entire counterweight ring 5 is balanced by the magnetic sheet 45 to prevent the counterweight ring 5 from vibrating due to centrifugal force. Since the arc slider 3 is made of iron, the arc slider 3 will be adsorbed in the current notch 9 through the magnetic sheet 45. Therefore, when the arc slider 3 is finally positioned at the notch 9 position, the arc slider 3 can be fixed in the notch 9, and the arc slider 3 will not be thrown out when the rotor is retested later. Since there is only one slot 10 on each positioning ring 6, the entire positioning ring 6 will be unbalanced in weight due to the slot 10. Therefore, two counterweight blocks 46 are formed on the surrounding side of the slot 10 to achieve the balance of the weight of the positioning ring 6.

Working principle:

Before the test, the sleeve 2 is coaxially sleeved on the outside of the rotor. During this process, the sleeve 2 is tightly connected to the outer wall of the rotor through the rubber rings 4 at both ends, so that the sleeve 2 and the rotor can be regarded as one. After the sleeve 2 is sleeved on the outside of the rotor, the rotating shafts at both ends of the rotor are respectively placed on two sets of roller parts, and then the sleeve 2 is rotated so that the notch 9 on one of the positioning rings 6 faces upward and faces the telescopic rod 11, and then the telescopic rod 11 is moved down to the lower end of the telescopic rod 11 and inserted into the slot 10 on the positioning ring 6. At this time, the sleeve 2 cannot rotate due to the limit of the telescopic rod 11, and then the position of the detection head 1 is adjusted so that the output light of the detection head 1 faces downward on the rotating shaft at one end of the rotor. Finally, the transmission belt 12 is pressed downward on the sleeve 2. When the transmission belt 12 presses the rotor tightly against the rotor bracket, the telescopic rod 11 is moved up. , so that the lower end of the telescopic rod 11 is separated from the slot 10, and then the sleeve 2 and the rotor are driven to rotate synchronously through the transmission belt 12. Due to the uneven distribution of the windings on the rotor and the uneven weight of the permanent magnet blocks, the rotor will vibrate due to the centrifugal force when rotating. Then the detection head 1 is used to monitor the amplitude of the rotor during rotation in real time. The data measured by the detection head 1 will be displayed on the display (not shown in the figure) in a combination of numerical values and ripples. When the rotor vibrates, the amplitude ripples displayed on the display will have obvious fluctuations. Among them, the sleeve 2 is made of light material, and the weight of the entire sleeve 2 is uniform. When the rotor rotates for the first time, the arc slider 3 is not installed in the annular groove 8, so the sleeve 2 itself will not vibrate due to the centrifugal force, and the display shows the amplitude of the rotor itself;

When the weight on the rotor is uneven, the rotor will vibrate due to centrifugal force. In order to facilitate the subsequent weight balancing of the rotor, it is also necessary to calculate the approximate position of the rotor with the largest weight. The specific calculation process is as follows:

The speed of the rotor is constant during the test. The speed of the rotor can be measured by a speed tester (not shown in the figure). The angular speed of the rotor can be obtained by the conversion formula of angular speed and speed ω=n×π/30 (ω is the angular speed, n is the speed), and the angular speed of the rotor is also a constant value. After the angular speed of the rotor is determined, according to the calculation formula of the angular speed ω=|Δθ|÷Δt (|Δθ| is the rotation angle of a certain point on the rotor, and Δt is the time required for a certain point on the rotor to rotate to |Δθ|), |Δθ|=ω*Δt can be obtained. Since ω is a fixed value, the value of |Δθ| can be finally obtained by calculating Δt. The rotor rotates clockwise by default. When the rotor rotates, the display will show the ripples of rotor vibration. When the rotor vibrates, the ripples begin to fluctuate violently. At this time, the display will show the time difference between the start of the rotor rotation and the start of the ripples. Substituting this time difference into |Δθ|=ω*Δt can obtain the value of |Δθ|. Since the slot 10 on the positioning ring 6 is facing upward before the rotor rotates, then at this time The value of |Δθ| is the angle between the heavier part of the rotor and the slot 10 on the positioning ring 6. Finally, the position of the heavier part of the rotor can be obtained. After that, the transmission belt 12 is separated from the sleeve 2, and each arc-shaped slider 3 is slid into the annular groove 8 through the corresponding notch 9. Then, the two arc-shaped sliders 3 are slid to the opposite side of the heavier part of the rotor through the scale ring 7 at the end of the sleeve 2. That is to say, the angle between the final positioning position of the arc-shaped slider 3 and the position of the heavier part of the rotor is 180°. Then, the arc-shaped slider 3 is fixed to the sleeve 2 through the locking piece. Since the arc-shaped slider 3 itself has weight, The rotor is balanced by the weight of the arc-shaped slider 3, and then the rotor is tested again. If the ripple amplitude displayed on the display has no obvious fluctuation, the balance adjustment of the rotor is completed. If the ripple displayed on the display still has obvious fluctuation, it means that the weight of the arc-shaped slider 3 is insufficient. Then, the weight of the arc-shaped slider 3 can be increased by adding weight plates to the arc-shaped slider 3. The two arc-shaped sliders 3 are symmetrical. If the adjacent wave peaks in the ripples displayed on the display are not much different, it means that there is only one part with a heavier weight on the rotor. In this case, when adjusting the position of the arc-shaped slider 3, the two arc-shaped sliders 3 need to be symmetrical. The two arc-shaped sliders 3 are on the same straight line. If the adjacent wave peaks in the ripples displayed on the display are greatly different, it means that there are multiple heavy parts on the rotor. In this case, when adjusting the position of the arc-shaped slider 3, the positions of the two arc-shaped sliders 3 may be staggered. Finally, the weight of the rotor is balanced by the two arc-shaped sliders 3. When the test is completed, the position of the current arc-shaped slider 3 is marked on the rotor, and then the sleeve 2 is removed. The rotor is then processed and the corresponding weight is increased at the marked position of the rotor. The weight increase of the rotor can be achieved by replacing a heavier permanent magnet block or welding a counterweight.

Claims (9)

1. The utility model provides a dynamic balance testing device, a serial communication port, including the rotor bracket, detect head (1), barrel-type counter weight mechanism and compress tightly actuating mechanism, the rotor transversely place on the rotor bracket, the rotor bracket includes two sets of gyro wheel spare that are used for upwards lifting the pivot at rotor both ends, detect the side of rotor bracket is located to head (1), detect the tip of the downward just rotor of output light of head (1), barrel-type counter weight mechanism includes sleeve (2) and two arc slider (3), all inlay in the both ends of sleeve (2) and be equipped with rubber ring (4), sleeve (2) coaxial cover is located outside the rotor, and sleeve (2) realize with the outer lane zonulae occludens of rotor through two rubber ring (4), equal coaxial shaping has counter weight ring (5) on the outer wall at sleeve (2) both ends, the side coaxial shaping of counter weight ring (5) has holding down ring (6), the side coaxial shaping of holding down ring (7) has seted up one ring groove (8) in counter weight ring (5), set up on the outer wall of counter weight ring (5) with slider (8) are linked together, slider (9) that each is equipped with in arc slider (3) are equipped with the breach (3) and are all used for pressing down in arc slider (3) each arc slider (3) through the corresponding to hold down ring groove (3), the positioning ring (6) is provided with a slot (10), the rotor positioning mechanism comprises a telescopic rod (11) which is vertically downwards inserted into the slot (10), the compression driving mechanism is arranged between the two groups of roller components, and the compression driving mechanism comprises a transmission belt (12) which downwards presses on the sleeve (2) and is used for driving the rotor to rotate.

2. The dynamic balance testing device according to claim 1, wherein the rotor bracket further comprises two supporting blocks (13) in a symmetrical state, the two supporting blocks (13) are distributed at intervals along the horizontal direction, the two groups of roller pieces are respectively arranged on the two supporting blocks (13), each group of roller pieces comprises two rotating wheels (14) in a symmetrical state, the two rotating wheels (14) are respectively rotated at the upper ends of the corresponding supporting blocks (13), the axial direction of each rotating wheel (14) is parallel to the interval direction of the two supporting blocks (13), the two rotating wheels (14) are positioned on the same side of the supporting blocks (13), and avoidance grooves (15) between the two rotating wheels (14) are respectively formed in the top of each supporting block (13).

3. The dynamic balance testing device according to claim 2, wherein the pressing driving mechanism further comprises a rotating arm (16), an elastic supporting piece, a fastening piece, a motor (17) and a belt sliding piece, wherein a vertical upright (18) is fixedly arranged at the side of one supporting block (13), an upright block (19) is formed at the top of the upright (18), the rotating arm (16) is arranged between the two supporting blocks (13) in a hooked shape, two ends of the rotating arm (16) are respectively provided with a hinged end (20) and a free end (21), two end angles are arranged on the rotating arm (16), the hinged end (20) of the rotating arm (16) is hinged with the upright block (19), the belt sliding piece comprises two fixed pulleys (22) and three free pulleys (23), a vertical plate (24) is fixedly arranged between the two supporting blocks (13), the two fixed pulleys (22) are distributed at intervals and are respectively rotated on the vertical plate (24), the three free pulleys (23) are respectively rotated on the free end (21) and the two end angles of the rotating arm (16), the motor (17) is horizontally fixed on one side of the vertical plate (24) and the two free pulleys (22) are coaxially arranged on the two supporting pulleys (12) which are fixedly connected with the belt sliding piece, the belt sliding piece is fixedly arranged on one side (12), the fastener is used for fixing the free end (21) of the rotating arm (16) with the vertical plate (24).

4. The dynamic balance testing device according to claim 3, wherein the elastic tightening piece comprises a bar-shaped fixing seat (25), a rectangular sliding block (26) and a spring (27), wherein a first bar-shaped through groove (28) is formed in one end angle of the rotating arm (16), the bar-shaped fixing seat (25) is fixedly arranged on one side of the rotating arm (16), a second bar-shaped through groove (29) parallel to the first bar-shaped through groove (28) is formed in the bar-shaped fixing seat (25), the rectangular sliding block (26) slides in the second bar-shaped through groove (29), a driving shaft (30) is coaxially and fixedly connected to one free pulley (23), one end of the driving shaft (30) sequentially penetrates through the first bar-shaped through groove (28) and the second bar-shaped through groove (29) and then is rotationally connected with the rectangular sliding block (26), baffles (31) are fixedly arranged at two ends of the bar-shaped fixing seat (25), the spring (27) is fixedly arranged in the second bar-shaped through groove (29), and two ends of the spring (27) are respectively abutted against the rectangular sliding block (26) and one baffle (31).

5. A dynamic balance testing device according to claim 3, wherein the fastener comprises a fixed shaft (32) and a screw cap (33), the fixed shaft (32) is formed on one side of the free end (21) of the rotating arm (16), the fixed shaft (32) is perpendicular to the rotating arm (16), the vertical plate (24) is provided with an arc through groove (34), the fixed shaft (32) passes through the arc through groove (34), one end of the fixed shaft (32) is in a thread shape, and the screw cap (33) is screwed on the end of the fixed shaft (32) in a thread shape.

6. A dynamic balance testing device according to claim 3, characterized in that the top of the upright (18) is fixedly provided with a mounting seat (35), a vertical flexible bent rod (36) is arranged in the mounting seat (35), and the detection head (1) is fixedly arranged at the top of the flexible bent rod (36).

7. A dynamic balance testing device according to claim 3, characterized in that a transverse strut (37) is formed on the upright block (19), a vertical bar-shaped socket (38) is fixedly arranged at the end part of the transverse strut (37), the telescopic rod (11) slides in the bar-shaped socket (38), a vertical three-number bar-shaped through groove (39) is formed on one side of the bar-shaped socket (38), a limiting pin (40) horizontally penetrating the three-number bar-shaped through groove (39) is formed on the telescopic rod (11), the end part of the limiting pin (40) is in a thread shape, and a first fastening nut (41) is screwed on the end part of the limiting pin (40) in the thread shape.

8. The dynamic balance testing device according to claim 1, wherein the cross section of each annular groove (8) and the cross section of each arc-shaped sliding block (3) are in an inverted-T shape, each locking piece comprises a threaded pin (42), a second fastening nut (43) and a pressing piece (44), the threaded pins (42) are formed on the tops of the arc-shaped sliding blocks (3), the threaded pins (42) are perpendicular to the arc-shaped sliding blocks (3), the pressing pieces (44) are arranged on the tops of the arc-shaped sliding blocks (3), the threaded pins (42) penetrate through the pressing pieces (44), and the second fastening nuts (43) are arranged on the threaded pins (42) in a screwed mode.

9. The dynamic balance testing device according to claim 1, wherein the inner wall of each annular groove (8) is fixedly provided with a magnetic sheet (45) opposite to the notch (9), each arc-shaped sliding block (3) is made of iron, and two symmetrical balancing weights (46) are formed on the peripheral side of each slot (10).