CN115420241A - Internal spline measuring device - Google Patents
Internal spline measuring device Download PDFInfo
- Publication number
- CN115420241A CN115420241A CN202211210777.1A CN202211210777A CN115420241A CN 115420241 A CN115420241 A CN 115420241A CN 202211210777 A CN202211210777 A CN 202211210777A CN 115420241 A CN115420241 A CN 115420241A
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- China
- Prior art keywords
- measuring
- internal spline
- measuring head
- connecting sleeve
- displacement sensor
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- Pending
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- 238000005259 measurement Methods 0.000 claims abstract description 26
- 238000006073 displacement reaction Methods 0.000 claims abstract description 22
- 229910003460 diamond Inorganic materials 0.000 claims description 5
- 239000010432 diamond Substances 0.000 claims description 5
- 238000007689 inspection Methods 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 239000000523 sample Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- -1 as shown in fig. 2 Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/10—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring diameters
- G01B21/14—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring diameters internal diameters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
Abstract
The invention relates to the technical field of precision measurement, in particular to an internal spline measuring device which can measure the major diameter or the minor diameter of an internal spline. The problems of difficulty in inspection, low measurement precision and low speed of the conventional internal spline are solved. The technical scheme adopted by the invention comprises a measuring head, a measuring rod, a rotating sleeve, a bearing end cover, a displacement sensor and a connecting sleeve; the measuring rod penetrates through the inner hole of the rotating sleeve, one end of the measuring rod is in contact with the displacement sensor, the other end of the measuring rod extends into the measuring head, the measuring head is in threaded connection with the rotating sleeve, and the displacement sensor is arranged in the inner hole of the connecting sleeve; the bearing end cover is arranged in the right end thread of the connecting sleeve; the measuring head is of a flexible hinge structure. The invention can realize the accurate measurement of the size of the small-diameter and large-length internal spline, has simple structure and low cost and can effectively improve the working efficiency.
Description
Technical Field
The invention relates to the technical field of precision measurement, in particular to an internal spline measuring device which can measure the major diameter or the minor diameter of an internal spline.
Background
The internal spline is very widely applied in military or industrial application, particularly to the application of gun barrels and gun barrels, and occupies a very important position in the military industry, so the internal spline is particularly important to processing and checking.
The inspection of the internal spline is difficult, and especially for the pipe fitting with large length-diameter ratio, the inspection condition is extremely harsh, and the inspection precision is difficult to ensure under the condition. The old method uses the measuring modes of an inner diameter dial indicator, a long rod gauge and the like, has great limitations in the aspects of measuring speed, measuring precision and the like, and non-contact measurement, for example, a photoelectric detection method is difficult to realize sometimes for small-diameter and large-length workpieces due to the fact that a sensor is large and the measuring range is limited.
Disclosure of Invention
In view of the above, the invention provides an internal spline measuring device to solve the problems of difficulty in inspection, low measurement accuracy and low speed of the existing internal spline, which can realize accurate measurement of the size of the internal spline with small diameter and large length, has a simple structure and low cost, and can effectively improve the working efficiency.
In order to solve the problems in the prior art, the technical scheme of the invention is as follows: an internal spline measuring device, its characterized in that: the measuring device comprises a measuring head, a measuring rod, a rotating sleeve, a bearing end cover, a displacement sensor and a connecting sleeve;
the measuring rod is arranged in the inner hole of the rotating sleeve in a penetrating mode, one end of the measuring rod is in contact with the displacement sensor, the other end of the measuring rod extends into the measuring head, the measuring head is in threaded connection with the rotating sleeve, and the displacement sensor is arranged in the inner hole of the connecting sleeve; the bearing end cover is arranged in the right end thread of the connecting sleeve; the measuring head is of a flexible hinge structure.
Further, the flexible hinge structure includes a triangular, diamond, or other polygonal structure.
Further, a notch is arranged on the inner side of the moving fulcrum of the flexible hinge structure.
Further, the notch is arc-shaped.
Furthermore, a pair of thrust bearings are arranged on two sides of the flange of the rotating sleeve, and the outer ring of each thrust bearing is matched with the inner wall of the connecting sleeve.
Furthermore, the number of the connecting sleeves can be increased according to the length of the workpiece to be measured so as to meet the measurement requirements of the workpieces to be measured with different lengths.
The invention has the advantages that:
1) The measuring head and the rotating sleeve are of detachable structures, so that the flexible hinge measuring head is convenient to replace, measuring heads with different sizes can be flexibly replaced according to different sizes of the internal splines, internal diameter measurement of different specifications, different lengths and different diameters of the internal splines is realized, the detection cost is greatly reduced, the flexible hinge measuring head has the characteristics of no clearance, no noise, small space size, high sensitivity and good working stability during measurement, can be in clearance-free fit with the diameter of the internal spline of a workpiece, namely can be tightly contacted with the diameter of the internal spline through the stress of the flexible hinge, and can accurately reflect the actual size of the internal spline.
2) The flexible stress of the measuring head is supported in the inner spline groove, the measuring rod moves axially due to the change of the inner diameter, the measurement of the straight inner spline can be realized, the size of the spiral inner spline can be accurately measured along with the rotation of the spiral groove of the inner spline, the use of a rotating motor is saved, the cost is reduced, the precision is improved, the operation is simple and convenient, and the control is easy, so that the requirement of the accurate measurement of the small diameter and the large length of the inner spline is met.
3) The invention has simple and flexible use, wide detection range, compact structure and high working efficiency, and can greatly reduce the detection cost and increase the detection efficiency.
Drawings
FIG. 1 is a schematic structural diagram of an internal spline measurement apparatus according to an embodiment of the present invention;
FIG. 2 is a rectangular flexible probe;
FIG. 3 is a diamond shaped flexible probe;
fig. 4 is a measurement schematic of a flexible hinge.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example (b): referring to fig. 1, the internal spline measuring device provided by the invention comprises a measuring head 1, a measuring rod 2, a rotating sleeve 3, a bearing end cover 4, a displacement sensor 5 and a connecting sleeve 6; the measuring rod 2 is arranged in an inner hole of the rotating sleeve 3 in a penetrating mode, one end of the measuring rod is in contact with the displacement sensor 5 to receive displacement change of the measuring rod, the other end of the measuring rod extends into the measuring head 1, the measuring head 1 is in threaded connection with the rotating sleeve 3, and the displacement sensor 5 is arranged in an inner hole of the connecting sleeve 6; a pair of thrust bearings are arranged on two sides of a flange of the rotating sleeve 3, the outer ring of each thrust bearing is matched with the inner wall of the connecting sleeve 6, and the bearing end cover 4 is arranged in the right end thread of the connecting sleeve 6 and used for adjusting the clearance of the thrust bearings.
The measuring head 1 is of a flexible hinge structure and can transmit the radial size change of the diameter of the internal spline into horizontal displacement; the flexible hinge can be in the form of triangle, diamond or other polygon, and can be used as long as the flexible hinge is of the same type. The present embodiment may employ a rectangular flexible probe, as shown in fig. 2, or a diamond shaped flexible probe, as shown in fig. 3.
The inboard of flexible hinge structure's rotation fulcrum department, the position that takes place micro rotation promptly is provided with breach 8, and the breach should not have stress concentration phenomenon, and breach 8 is the arc in this embodiment. The measuring head 1 is provided with a flexible hinge structure at a pivot point needing to rotate, and a part of materials are properly removed. As shown in fig. 2 and 3, a part of material is dug at the 5 fulcrums of each rod piece, so that the fulcrums can generate certain rotational deformation under certain external force to move the rod piece, the amount of the dug material is based on the measurement of the size of the internal spline, the amount of the dug material is large, the hinge wall is thin and easy to deform, the deformation stress is reduced, and vice versa.
The inner hole of the rotating sleeve 3 is matched with the measuring rod 2, the outer diameter of the rotating sleeve is matched with the thrust bearing, and the measuring head 1 not only realizes measurement of a straight internal spline, but also can rotate along with a spiral internal spline of a measured workpiece 7 to realize size measurement of the spiral internal spline. The measuring head 1 and the rotary sleeve 3 are detachable structures, and measuring heads with different sizes can be replaced according to different sizes of the internal splines, so that the measurement of the internal splines with multiple specifications is realized.
The displacement sensor can receive the displacement change of the measuring rod 2, so that the size change of the internal spline can be measured.
The connecting sleeve 6 can be increased in connecting number at will so as to meet the measuring requirements of the internal splines of the measured workpiece 7 with different lengths.
The installation and measurement process of the invention comprises the following steps:
firstly, the measuring rod 2 is installed in an inner hole of the rotating sleeve 3, then a pair of thrust bearings are installed on two sides of a flange of the rotating sleeve 3, an outer ring of each thrust bearing is installed in a matched mode with the connecting sleeve 6, the bearing end cover 4 is screwed into a right end thread of the connecting sleeve 6, a thrust bearing gap is adjusted to enable the thrust bearing gap to meet a certain pre-tightening amount, then a left end inner thread of a measuring head 1, which is suitable for being detected by a measured workpiece 7, is connected with an outer thread of the right end of the rotating sleeve 3, and the measuring head changing structure is adopted. The axial position of the measuring rod 2 is adjusted to be actually contacted with the measuring head 1, and a set screw on the rotating sleeve 3 is screwed down to prevent the axial movement. Finally, the displacement sensor 5 is mounted in the inner bore of the connecting sleeve 6, so that it is in contact with the measuring rod 2.
The measuring device which is installed well is placed in a spline hole of a measured workpiece 7 which needs to be detected, the measuring head 1 is clamped in the spline, the measuring device moves axially in the workpiece, the measuring head 1 is driven to move axially and rotates along with the inner spline in a spiral mode, when the diameter size of the spline changes, the flexible hinge structure of the measuring head 1 enables the measuring rod 2 to move axially, and the displacement sensor 5 can evaluate and give a measuring result according to an error theory through calibration. If the workpiece 7 to be measured is longer, the measurement requirement can be ensured by increasing the number of the connecting sleeves 6. Therefore, the detection requirement of the small-diameter large-scale internal spline can be met.
The specific measurement is illustrated by taking the rectangular measuring head in the example of fig. 2 in the present case as an example, when the measuring head is stressed radially, that is, the diameter size of the internal spline is changed, if the size of the internal spline is reduced, the fulcrum of the measuring head is compressed, each fulcrum of the hinge is deformed and displaced, the change of the radial size is converted into axial displacement, as shown in fig. 4, the length L of the measuring head is equal to the length L of the measuring head 1 The high order of the axial error generated by the rotation deformation is infinitesimally small and neglected, when the size of the internal spline is reduced by 2 delta x, the outer diameter of the measuring head is unilaterally compressed by delta x,the fulcrum in the middle of the measuring head axially moves delta y, and the measuring rod 2 connected with the fulcrum in the middle of the measuring head transfers the axial displacement to the sensor, so that the change of the diameter size of the internal spline is accurately measured. In fig. 4, the relationship between radial dimension change and axial displacement is:
namely, the measuring head senses the diameter change of the internal spline, the change is transmitted to the displacement sensor, evaluation is carried out according to the error theory, and a measuring result is given.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (6)
1. An internal spline measuring device, its characterized in that: the measuring device comprises a measuring head (1), a measuring rod (2), a rotating sleeve (3), a bearing end cover (4), a displacement sensor (5) and a connecting sleeve (6);
the measuring rod (2) penetrates through an inner hole of the rotating sleeve (3), one end of the measuring rod is in contact with the displacement sensor (5), the other end of the measuring rod extends into the measuring head (1), the measuring head (1) is in threaded connection with the rotating sleeve (3), and the displacement sensor (5) is arranged in an inner hole of the connecting sleeve (6); the bearing end cover (4) is arranged in the right end thread of the connecting sleeve (6); the measuring head (1) is of a flexible hinge structure.
2. The internal spline measurement device according to claim 1, wherein: the flexible hinge structure comprises a triangular, diamond or other polygonal structure.
3. The internal spline measuring device according to claim 2, wherein: and a notch is arranged on the inner side of the moving fulcrum of the flexible hinge structure.
4. An internal spline measurement device according to claim 3, wherein: the notch is arc-shaped.
5. An internal spline measurement device according to any one of claims 1 to 4, wherein: and a pair of thrust bearings are arranged on two sides of the flange of the rotating sleeve (3), and the outer rings of the thrust bearings are matched with the inner wall of the connecting sleeve (6).
6. An internal spline measurement device according to claim 3, wherein: the connecting sleeve (6) can increase the number according to the length of the workpiece to be measured so as to meet the measurement requirements of the workpieces (7) to be measured with different lengths.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211210777.1A CN115420241A (en) | 2022-09-30 | 2022-09-30 | Internal spline measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211210777.1A CN115420241A (en) | 2022-09-30 | 2022-09-30 | Internal spline measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115420241A true CN115420241A (en) | 2022-12-02 |
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ID=84207039
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211210777.1A Pending CN115420241A (en) | 2022-09-30 | 2022-09-30 | Internal spline measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115420241A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102794674A (en) * | 2012-08-16 | 2012-11-28 | 四川省绵阳西南自动化研究所 | Device for measuring inner diameter of deep hole |
| CN205898111U (en) * | 2016-07-29 | 2017-01-18 | 武汉工程大学 | High temperature flange connects measuring device that deflects based on rhombus displacement amplification mechanism |
| CN208983992U (en) * | 2018-10-18 | 2019-06-14 | 南京信息职业技术学院 | Detection apparatus for independently measure deep hole internal diameter |
| CN214620978U (en) * | 2021-04-14 | 2021-11-05 | 四川优机实业股份有限公司 | Gauge for measuring diameter of inner groove |
| CN114659446A (en) * | 2022-03-07 | 2022-06-24 | 西安工业大学 | Contact type measuring instrument for efficiently measuring shape and position errors of plane inner hole group |
-
2022
- 2022-09-30 CN CN202211210777.1A patent/CN115420241A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102794674A (en) * | 2012-08-16 | 2012-11-28 | 四川省绵阳西南自动化研究所 | Device for measuring inner diameter of deep hole |
| CN205898111U (en) * | 2016-07-29 | 2017-01-18 | 武汉工程大学 | High temperature flange connects measuring device that deflects based on rhombus displacement amplification mechanism |
| CN208983992U (en) * | 2018-10-18 | 2019-06-14 | 南京信息职业技术学院 | Detection apparatus for independently measure deep hole internal diameter |
| CN214620978U (en) * | 2021-04-14 | 2021-11-05 | 四川优机实业股份有限公司 | Gauge for measuring diameter of inner groove |
| CN114659446A (en) * | 2022-03-07 | 2022-06-24 | 西安工业大学 | Contact type measuring instrument for efficiently measuring shape and position errors of plane inner hole group |
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