Dynamic balance bridge structure of high-speed high-precision spindle motor

Abstract

The utility model relates to the technical field of rotor dynamic balance detection equipment, in particular to a dynamic balance bridge structure of a high-speed high-precision spindle motor, which comprises a workbench, a driving mechanism, a support frame and a vibration speed sensor. The support frame comprises a base fixed on the workbench, a support seat and a support column which are respectively fixed on the base, and a floating assembly which is detachably connected on the support seat, and the vibration speed sensor is in threaded connection on the support column; the floating assembly comprises a bridge assembly, a floating block and a pull rod assembly which are detachably connected in sequence; a protrusion is arranged below the floating block, a groove is formed in the support, and the protrusion of the floating block extends into the groove in the support. One side of the pull rod assembly is fixedly connected with a tension spring, and the end, away from the pull rod assembly, of the tension spring is fixedly connected to the side wall of the support. The device can improve the comprehensiveness of vibration signal acquisition of the vibration speed sensor, thereby improving the accuracy of a rotor dynamic balance detection result.

Description

Technical Field

[0001] The utility model relates to the technical field of rotor dynamic balance detection equipment, in particular to a dynamic balance bridge structure of a high-speed and high-precision spindle motor. Background Art

[0002] High-speed and high-precision motors are motors with high-speed operation and high-precision control capabilities. They can meet application scenarios with high requirements for speed, precision and stability. They are widely used in industrial automation, aerospace and other fields.

[0003] High-speed motors have very strict requirements on the dynamic balance of the rotor, because the imbalance of the rotor will cause excessive vibration and noise during the operation of the motor, thus affecting the performance and life of the equipment. Therefore, the motor rotor needs to be dynamically balanced during the manufacturing process.

[0004] The dynamic balancing test of motor rotors refers to the use of a dynamic balancing tester to calibrate the rotors to correct problems such as increased motor vibration and noise caused by uneven distribution of rotor materials or processing errors when the rotors rotate. Therefore, the detection accuracy of the dynamic balancing tester plays an important role in the processing of high-speed motors.

[0005] The prior art "An ultra-precision dynamic balancing device suitable for micro rotors" (publication number: CN104848990A) discloses a dynamic balancing detector that can detect the radial dynamic balance of micro rotors. However, the prior art still has the following technical problems:

[0006] The internal structure of the support frame in the prior art is composed of multiple rigid rods connected to each other by multiple hinges. The vibration force of the motor rotor during rotation needs to be transmitted through multiple rigid rods and multiple hinges so that the sensor arranged under the support frame can sense the signal. This hinge structure needs to ensure very good smoothness. If one of the hinges is stuck due to insufficient lubrication, the vibration force cannot be effectively transmitted through the hinge structure, causing the sensor to be unable to fully and accurately sense the vibration signal, causing the dynamic balancing test result to be distorted. When the rotor is installed in the motor and rotates, the motor will vibrate severely, accelerate the wear of the rotor shaft, and eventually cause damage to the motor. Utility Model Content

[0007] The utility model provides a dynamic balancing bridge structure for a high-speed and high-precision spindle motor, which can solve the problem that the support frame of the dynamic balancing tester in the prior art is easily stuck due to hinges, resulting in the ineffective transmission of vibration force, causing distortion of dynamic balancing test results and ultimately causing damage to the motor.

[0008] The present application provides the following technical solutions: A dynamic balancing bridge structure of a high-speed and high-precision spindle motor, comprising a workbench, a driving mechanism fixed in the middle of the workbench, a support frame fixed on both sides of the driving mechanism, and a vibration velocity sensor detachably connected to the support frame;

[0009] The support frame includes a base fixed on the workbench, a support and a pillar respectively fixed on the base, and a floating component fixedly connected to the support, and the vibration velocity sensor is threadedly connected to the pillar;

[0010] The floating assembly includes a bridge assembly, a floating block and a pull rod assembly which are fixedly connected in sequence from top to bottom; a protrusion is provided under the floating block, and a groove is provided on the support, the protrusion of the floating block extends into the groove on the support, and the size of the groove on the support is larger than the size of the protrusion on the floating block; a tension spring is fixedly connected to one side of the pull rod assembly, and the end of the tension spring away from the pull rod assembly is fixedly connected to the side wall of the support.

[0011] Beneficial effects:

[0012] The motor rotor is placed on the bridge assembly and rotates driven by the driving mechanism. The vibration force generated when the rotor rotates will cause the protrusion under the floating block to swing in the groove of the support and touch the inner wall of the groove, thereby stably transmitting the vibration force to the vibration velocity sensor through the support, base and pillar in sequence. The tension spring between the pull rod assembly and the support enables the floating block to quickly return to its original position after swinging, which is beneficial to ensure that the vibration force when the protrusion of the floating block hits the groove of the support can be continuously and stably transmitted. Since the tension spring can store potential energy, the swing time of the floating block can be extended, so as to improve the comprehensiveness and accuracy of the vibration signal collection of the vibration velocity sensor, and ultimately improve the accuracy of the rotor dynamic balancing detection results.

[0013] Furthermore, the bridge assembly includes a stepped shaft threadedly connected above the floating block, a roller frame detachably connected to the stepped shaft, and a roller rotatably connected to the roller frame.

[0014] Beneficial effect: The roller is used to support the two ends of the motor rotor. When the motor rotor rotates, the roller contacts the outer circle of the shaft at both ends of the motor rotor, which can reduce the friction of the rotor rotation, avoid the vibration force caused by friction from interfering with the signal collected by the vibration velocity sensor, and improve the accuracy of the dynamic balance detection result.

[0015] Furthermore, a strip hole is opened in the middle of the roller frame, and the roller is rotatably connected in the strip hole. U-shaped openings are opened at both ends of the roller frame, and the diameter of the middle section of the stepped shaft is larger than the diameters at both ends, and the upper section of the stepped shaft is inserted into the U-shaped opening.

[0016] Beneficial effects: The diameter of the middle section of the stepped shaft is larger than the diameters of the two ends, so that the stepped shaft can form a stable support for the roller frame. At the same time, a strip hole is opened in the middle of the roller frame to facilitate the installation of the roller.

[0017] Furthermore, the pull rod assembly includes a pull rod and fasteners detachable from both ends of the pull rod, the fastener at the upper end of the pull rod is connected to the floating block screw, the fastener at the lower end of the pull rod is connected to the support screw, a connecting block is fixed in the middle of the pull rod, one side of the connecting block is fixed to one end of the tension spring, and the two ends of the pull rod are spheres.

[0018] Beneficial effect: The fasteners at both ends of the tie rod facilitate fixing the tie rod between the floating block and the support, thereby facilitating support for the floating block and the bridge assembly.

[0019] Furthermore, the fastener comprises two semicircular blocks, a spherical groove is provided in the middle of the semicircular blocks, and the ball at the end of the pull rod is rotatably connected in the spherical groove.

[0020] Beneficial effect: The ball at the end of the pull rod is rotatably connected in the spherical groove of the semicircular block, which makes it easy for the floating block to swing left and right, thereby achieving the effect of floating support.

[0021] Furthermore, the driving mechanism includes a mounting plate fixed on the workbench, a motor fixed on the mounting plate by screws, a pulley fixed on the mounting plate, and a belt used to be wound around the pulley.

[0022] Beneficial effect: When the motor rotates, the motor rotor is driven to rotate by the belt, so as to achieve the purpose of dynamic balancing detection of the rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is the front view of the utility model.

[0024] Figure 2 for Figure 1 A magnified view of center.

[0025] Figure 3 for Figure 1 Top view of the . DETAILED DESCRIPTION

[0026] The following is further described in detail through specific implementation methods:

[0027] The marks in the drawings in the specification include: workbench 1, motor 2, belt 21, driving wheel 22, driven wheel 23, mounting plate 3, vibration speed sensor 4, roller frame 5, stepped shaft 6, roller 7, rotor 8, threaded hole 9, fastening screw 91, floating block 10, pillar 11, semicircular block 12, locking screw 13, pull rod 14, connecting block 15, tension spring 16, base 17, support 18.

[0028] Embodiment 1

[0029] like Figures 1 to 3 As shown, a dynamic balancing bridge structure of a high-speed and high-precision spindle motor includes a workbench 1, a driving mechanism fixed in the middle of the workbench 1, support frames fixed on both sides of the driving mechanism, and a vibration velocity sensor 4 screwed to the support frame.

[0030] like Figure 1 and Figure 3 As shown, the driving mechanism includes a mounting plate 3 fixed on the workbench 1, a motor 2 fixed on the mounting plate 3 by screws, a pulley arranged on the mounting plate 3 and a belt 21 for winding around the pulley, the pulley includes a driving wheel 22 and a driven wheel 23, the driving wheel 22 is keyed to the main shaft of the motor 2, the driven wheel 23 is pivoted to the mounting plate 3 through a rotating shaft, the belt 21 can be sleeved on the driving wheel 22, the driven wheel 23 and the outer circle of the rotor 8, and when the main shaft of the motor 2 rotates, the rotor 8 can be driven to rotate.

[0031] like Figure 2 As shown, the support frame includes a base 17 fixed to the workbench 1 by screws, a support 18 and a pillar 11 fixed to the base 17 by screws, and a floating component detachably connected to the support 18. Two pillars 11 are provided, which are respectively located on both sides of the support 18. The threaded connector of the vibration velocity sensor 4 is connected to the side wall of the pillar 11.

[0032] The floating assembly includes a bridge assembly, a floating block 10 and a pull rod assembly which are detachably connected from top to bottom; a tension spring 16 is fixedly connected to one side of the pull rod assembly, and one end of the tension spring 16 away from the pull rod assembly is fixed to the side wall of the support 18.

[0033] The bridge assembly includes a stepped shaft 6 threadedly connected to the floating block 10, a roller frame 5 fixedly connected to the stepped shaft 6, and a roller 7 rotatably connected to the roller frame 5; a strip hole is opened in the middle of the roller frame 5, and the roller 7 is pivotally connected in the strip hole. U-shaped openings are opened at both ends of the roller frame 5, and the upper section of the stepped shaft 6 is inserted into the U-shaped opening. The diameter of the middle section of the stepped shaft 6 is larger than the diameter of the two ends, and the diameter of the middle section of the stepped shaft 6 is also larger than the width of the U-shaped openings at both ends of the roller frame 5, so that when the upper section of the stepped shaft 6 is inserted into the U-shaped opening, the stepped shaft 6 can support the roller frame 5, and a threaded hole 9 is opened on the side wall of the U-shaped opening of the roller frame 5, and a roller 7 is connected in the threaded hole 9. Figure 3 As shown in the fastening screw 91 , when the upper section of the stepped shaft 6 is inserted into the U-shaped opening, the upper end of the stepped shaft 6 can be clamped in the U-shaped opening of the roller frame 5 by tightening the fastening screw 91 .

[0034] The lower section of the stepped shaft 6 is provided with an external thread, which can be threadedly connected to the upper part of the floating block 10. A protrusion is provided at the lower part of the floating block 10, and a groove is provided at the upper end of the support 18. The protrusion of the floating block 10 extends into the groove on the support 18, and there is a gap between the protrusion of the floating block 10 and the inner wall of the groove.

[0035] The pull rod assembly includes a pull rod 14 and fasteners that are detachable from the two ends of the pull rod 14. A connecting block 15 is fixed in the middle of the pull rod 14. One side of the connecting block 15 is fixed to the end of the tension spring 16 away from the support 18. The two ends of the pull rod 14 are spheres; the fasteners include two semicircular blocks 12. A spherical groove is provided in the middle of the semicircular block 12. The spheres at the ends of the pull rod 14 are rotatably connected in the spherical grooves. The two semicircular blocks 12 are connected to the floating block 10 or the support 18 by locking screws 13. After the two semicircular blocks 12 are combined, the spheres at the ends of the pull rod 14 can be inserted into the spherical grooves of the semicircular blocks 12.

[0036] The method of using this device is as follows:

[0037] Place the rotor 8 on the support frame so that both ends of the rotor 8 are in contact with the rollers 7 on the support frame. Put the belt 21 on the driving wheel 22, the driven wheel 23 and the outer circle of the rotor 8. When the main shaft of the motor 2 rotates, the rotor 8 can be driven to rotate. The rotor 8 vibrates during the rotation process, and its vibration force will pass through Figure 2 The roller frame 5 and the stepped shaft 6 transmit the vibration to the floating block 10, causing the floating block 10 to swing horizontally, and the protrusion of the floating block 10 hits the inner wall of the groove on the support 18, thereby transmitting the vibration force to the support 18, and the vibration of the support 18 will drive the vibration of the base 17 and the pillar 11. The vibration velocity sensor 4 located on the pillar 11 can collect the vibration signal and then transmit the signal to the detection system for detection and analysis.

[0038] The above is only an embodiment of the utility model. The utility model is not limited to the field involved in this implementation case. The common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A dynamic balancing bridge structure of a high-speed and high-precision spindle motor, comprising a workbench, a driving mechanism fixed in the middle of the workbench, a support frame fixed on both sides of the driving mechanism, and a vibration velocity sensor detachably connected to the support frame; characterized in that: The support frame includes a base fixed on the workbench, a support and a pillar respectively fixed on the base, and a floating component fixedly connected to the support, and the vibration velocity sensor is threadedly connected to the pillar; The floating assembly includes a bridge assembly, a floating block and a pull rod assembly which are fixedly connected in sequence from top to bottom; a protrusion is provided under the floating block, and a groove is provided on the support, the protrusion of the floating block extends into the groove on the support, and the size of the groove on the support is larger than the size of the protrusion on the floating block; a tension spring is fixedly connected to one side of the pull rod assembly, and the end of the tension spring away from the pull rod assembly is fixedly connected to the side wall of the support.

2. The dynamic balance bridge structure of a high-speed and high-precision spindle motor according to claim 1, characterized in that: The bridge assembly comprises a stepped shaft threadedly connected above the floating block, a roller frame detachably connected to the stepped shaft, and a roller rotatably connected to the roller frame.

3. The dynamic balance bridge structure of a high-speed and high-precision spindle motor according to claim 2, characterized in that: A strip hole is provided in the middle of the roller frame, and the roller is rotatably connected in the strip hole. U-shaped openings are provided at both ends of the roller frame, and the diameter of the middle section of the stepped shaft is larger than the diameters at both ends, and the upper section of the stepped shaft is inserted into the U-shaped opening.

4. The dynamic balance bridge structure of a high-speed and high-precision spindle motor according to claim 3, characterized in that: The pull rod assembly includes a pull rod and fasteners detachable from both ends of the pull rod, the fastener at the upper end of the pull rod is connected to the floating block screw, the fastener at the lower end of the pull rod is connected to the support screw, a connecting block is fixed in the middle of the pull rod, one side of the connecting block is fixed to one end of the tension spring, and the two ends of the pull rod are spheres.

5. The dynamic balance bridge structure of a high-speed and high-precision spindle motor according to claim 4, characterized in that: The fastener comprises two semicircular blocks, a spherical groove is arranged in the middle of the semicircular blocks, and the ball at the end of the pull rod is rotatably connected in the spherical groove.

6. The dynamic balance bridge structure of a high-speed and high-precision spindle motor according to claim 5, characterized in that: The driving mechanism comprises a mounting plate fixed on the workbench, a motor fixed on the mounting plate by screws, a pulley fixed on the mounting plate and a belt used to be wound around the pulley.

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