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CN-121994113-A - Stator outer diameter roundness detection mechanism and method based on internal expansion type positioning

CN121994113ACN 121994113 ACN121994113 ACN 121994113ACN-121994113-A

Abstract

The invention provides a stator outer diameter roundness detection mechanism and method based on internal expansion type positioning, which relates to the technical field of precision measurement, and comprises a base, a rotary driving module, a product positioning module, a lifting driving module and a detection module, wherein the product positioning module adopts an internal expansion type mechanism consisting of a jacking column, a positioning block and a wedge block group, the axial movement of the jacking column drives the wedge block group to radially expand the inner hole of a stator, so as to adapt to different inner diameter tolerances, when the high-precision non-eccentric positioning is realized, the lifting driving module drives the plurality of contact type displacement sensors to axially move along the stator to scan the outline of the outer diameter of the stator core unit, and meanwhile, the rotating driving module is used for indexing, so that the automatic and high-efficiency detection of the roundness of the outer diameter of all the stator core units is realized.

Inventors

  • XIAO AIFENG
  • LU YONGZHENG

Assignees

  • 苏州藤飞精工科技有限公司

Dates

Publication Date
20260508
Application Date
20260210

Claims (10)

  1. 1. Stator external diameter roundness detection mechanism based on internal expanding type location, which is characterized by comprising: A base station; The rotary driving module is arranged on the base station; The product positioning module comprises a central jig and a positioning group, wherein the central jig is fixedly arranged at the driving end of the rotary driving module and is driven to rotate by the driving end of the rotary driving module; the lifting driving module is arranged on the base station; The detection module comprises a lifting plate which is driven by the lifting driving module to perform vertical lifting movement, and at least one group of contact type displacement sensors which are arranged on the lifting plate and are used for detecting the outer diameter roundness of the stator core unit.
  2. 2. The stator outer diameter roundness detection mechanism based on internal expansion positioning of claim 1, wherein the positioning group comprises: the top end of the jacking column is a conical surface; The bottom plate body of the positioning block is fixed on the central jig, and a plurality of jacks are formed in the periphery of the positioning block; the wedge block groups are formed by encircling four groups of wedge block units, the inner side of each group of wedge block units is connected with an inserting block, the inserting blocks penetrate through the insertion holes on the positioning blocks, and the end parts of all the inserting blocks encircle to form a taper hole matched with the taper surface of the jacking column; The jack post is configured to move along the axial direction, and the plug is driven to drive the wedge block unit to move along the radial direction through the cooperation of the conical surface and the conical hole so as to realize the tensioning and the loosening of the stator sleeved outside the wedge block group.
  3. 3. The stator outer diameter roundness detection mechanism based on internal expansion positioning of claim 2, further comprising a top cylinder, wherein the bottom end of the top cylinder is connected to the driving end of the top cylinder through a rotating ring, one side of the rotating ring is installed at the end part of a piston rod of the top cylinder in a switching mode, and the other side of the rotating ring is fixedly connected with the top cylinder, so that the top cylinder can drive the top cylinder to axially move, and meanwhile, the rotary driving module can drive the central jig and the top cylinder to rotate together.
  4. 4. The stator outer diameter roundness detection mechanism based on internal expansion positioning of claim 2, wherein an annular tightening groove is formed in the periphery of the wedge block set, and an elastic tightening belt is sleeved in the tightening groove and is used for providing continuous elastic force for inward tightening of the wedge block unit.
  5. 5. The stator outer diameter roundness detection mechanism based on internal expansion positioning according to claim 1, wherein the detection module further comprises reciprocating cylinders driving the contact displacement sensors to move in the radial direction, and the number of the contact displacement sensors is four groups and are distributed and installed on the lifting plate at intervals of 90 °.
  6. 6. The stator outer diameter roundness detection mechanism based on internal expansion positioning of claim 1, wherein the lifting driving module comprises an electric cylinder, the lifting plate is connected with the middle pushing plate, and the driving end of the electric cylinder is connected with the middle pushing plate to drive the middle pushing plate to lift.
  7. 7. The stator outer diameter roundness detection mechanism based on internal expansion positioning of claim 6, further comprising a guide mechanism for improving lifting stability, wherein the guide mechanism comprises a guide sleeve fixed on the base and a guide rod fixed on the middle push plate or the lifting plate and in sliding fit with the guide sleeve.
  8. 8. A stator outer diameter roundness detection method based on internal expansion positioning, which adopts the stator outer diameter roundness detection mechanism based on internal expansion positioning as claimed in any one of claims 1 to 7, and is characterized by comprising the following steps: s1, feeding and positioning, namely placing a stator product on a central jig, driving a jacking column to ascend, and radially tensioning an inner hole of a stator by the wedge block set through the cooperation of the conical surface of the jacking column and the conical hole of the wedge block set; S2, the first detection and positioning are carried out, namely the contact type displacement sensor is driven to move radially, so that the induction head of the contact type displacement sensor is propped against the outer diameter surface of the stator core unit of the current station; S3, axial scanning detection, namely driving the contact type displacement sensor to axially move along the stator, and sensing the runout degree of the outer diameter surface of the stator core unit in the moving process; s4, the sensor is retreated, namely the contact type displacement sensor is driven to retreat in the radial direction, so that the induction head is separated from the stator; S5, rotating and indexing, namely driving the stator to rotate by a preset angle through the rotary driving module; s6, repeatedly detecting, namely repeatedly executing the steps S2 to S5 until the detection of all stator core units of the stator is completed.
  9. 9. The method for detecting roundness of outer diameter of stator based on internal expanding positioning according to claim 8, wherein the axial movement of the contact displacement sensor in step S3 includes ascending scan and descending scan, the ascending scan is performed when step S3 is performed for the first time, the descending scan is performed when step S3 is performed for the second time, and the ascending scan and the descending scan are alternately performed in such a way that the detection of all stator core units of the stator is completed.
  10. 10. The method for detecting the roundness of the outer diameter of a stator based on internal expansion positioning according to claim 9, wherein the predetermined angle is 30 degrees, the method is suitable for a stator with 12-piece stator core units, and detection of all 12-piece stator core units is completed by four groups of contact displacement sensors by alternately performing ascending scanning and descending scanning and combining 30 degrees of rotation each time.

Description

Stator outer diameter roundness detection mechanism and method based on internal expansion type positioning Technical Field The invention relates to the technical field of precise measurement, in particular to a high-precision and high-efficiency detection mechanism and a detection method for the outer diameter roundness of a motor stator core. Background The motor stator is usually formed by splicing multi-piece stator core units, the roundness of the outer diameter of the motor stator is a key index for influencing the performance of the motor, at present, a manufacturing center jig (namely a mandrel) is generally adopted in the industry for positioning a product, and then a sensor is used for measuring, however, because positive and negative tolerances exist in the inner diameter of a stator product and the tolerance range can be large, the traditional center jig positioning method has obvious defects, namely, if a positioning shaft is manufactured according to the negative tolerance dimension of the inner diameter of the product, gaps are generated when the positioning shaft encounters the product with the positive tolerance, positioning inaccuracy and eccentricity are caused, and the accuracy of a measurement result is seriously influenced, otherwise, if the positioning shaft is manufactured according to the positive tolerance dimension, the product cannot be sleeved into the jig, and cannot be detected when the positioning shaft encounters the product with the negative tolerance. Therefore, the prior art cannot realize accurate and reliable positioning of products with different inner diameter tolerances while ensuring the feeding convenience of the products, and a new solution is needed. Disclosure of Invention The invention aims to overcome the defects of the prior art and provides a stator roundness outer diameter detection mechanism which adopts an internal expansion type tensioning positioning mode, can adapt to tolerance change of the inner diameter of a product, realizes high-precision and eccentric-free positioning, ensures convenient feeding and has high detection efficiency. The invention provides the following technical scheme: The inner-expansion type positioning-based stator outer diameter roundness detection mechanism comprises a base station, a rotation driving module, a product positioning module, a lifting driving module and a detection module, wherein the rotation driving module is arranged on the base station, the core function of the rotation driving module is precisely divided, namely, the rotation driving module drives a product positioning module (a central jig and a stator product) to rotate by a specific angle so that a sensor can sequentially detect all stator iron core units, the structure of the inner-expansion type positioning-based stator outer diameter roundness detection mechanism specifically comprises a power source, a transmission mechanism, a mounting platform and a hollow structure, the power source is a servo motor or a stepping motor and is used for providing precise rotation power, the transmission mechanism is a speed reducer and a coupler and is used for connecting an output shaft of the motor to perform speed reduction and torque increase, the mounting platform is fixedly connected to the base station, and the outer side of the inner-expansion type positioning module is also connected with the transmission mechanism through a gear ring, and the middle part of the mounting platform is of the hollow structure and is used for positioning a stator product through the hollow structure; Under the scheme, five basic components of the mechanism, namely a base station, a rotary driving module, a product positioning module, a lifting driving module and a detection module, are defined. The division makes the whole detection system clear in structure, each module is special in function and convenient to design, manufacture, assemble and maintain, and by organically combining rotation, positioning, lifting and detection functions, a technical scheme capable of automatically completing stator roundness detection is integrally constructed, a traditional manual and low-efficiency detection mode is fundamentally abandoned, and a structural foundation is laid for realizing high-efficiency and high-consistency detection. The positioning group comprises a jacking column, a positioning block and wedge block groups, wherein the top end of the jacking column is a conical surface, the bottom plate body of the positioning block is fixed on the central jig, and a plurality of insertion holes are formed in the periphery of the bottom plate body of the positioning block; The jack post is configured to move along the axial direction, and the plug is driven to drive the wedge block unit to move along the radial direction through the cooperation of the conical surface and the conical hole so as to realize the tensioning and the loosening of the stator sleeved outside the wedge block group.