CN108287109B - High-centering-precision clamp connecting device for mechanical testing machine - Google Patents
High-centering-precision clamp connecting device for mechanical testing machine Download PDFInfo
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- CN108287109B CN108287109B CN201711389672.6A CN201711389672A CN108287109B CN 108287109 B CN108287109 B CN 108287109B CN 201711389672 A CN201711389672 A CN 201711389672A CN 108287109 B CN108287109 B CN 108287109B
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- conical surface
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
- G01N2203/0405—Features allowing alignment between specimen and chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
- G01N2203/0423—Chucks, fixtures, jaws, holders or anvils using screws
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to a high centering precision clamp connecting device for a mechanical testing machine, which comprises: a clamping portion, a fixing portion, a coupling portion; the end face of one end of the clamping part connected with the connecting part is provided with a positioning convex conical surface, and a positive pressure external thread is closely adjacent to the positioning convex conical surface and is used for being matched with the connecting part for connection and locking; the end face of the other end of the connecting part connected with the fixing part is provided with a positioning concave conical surface, and a reverse-tooth external thread is close to the positioning concave conical surface and is used for being matched with the connecting part for connection and locking; the connecting part is a connecting threaded sleeve with positive and negative internal threads at two ends. The connecting device has the advantages of compact and light structure, low processing cost and easy operation, can ensure the extremely high centering precision of the clamp and the pull rod of the testing machine in the experimental process, is stable in connection, and can have the advantage of continuously adjustable axial position of the clamp compared with the connection of the traditional flange plate.
Description
Technical Field
The invention relates to a high-centering-precision clamp connecting device for a mechanical tester, belongs to the field of material testing equipment, is not limited to the field of material testing equipment, and also covers occasions requiring high-centering-precision connection between parts in other industries.
Background
The types of the test machine clamp can be divided into: universal fixture; a special fixture; an adjustable clamp; and (5) combining the clamps. The test pieces in different shapes are fixed on a high-frequency fatigue testing machine, the clamp plays an important role in connection, and one testing machine is usually provided with a plurality of sets of clamps with different purposes and specifications.
However, for the connection of the clamp and the testing machine, the common nut tensioning structure has poor centering performance and larger axial force, and the test sample bears extra bending moment due to eccentricity; although the flange plate connecting structure has good centering precision, the flange plate connecting structure is complex, occupies a limited space in a testing machine, and once the flange plate connecting structure is installed in a clamp, the periphery of the clamp cannot be adjusted, additional torsion can be caused to a test sample, and the defects seriously affect the accuracy of a test result. Therefore, it is necessary to design a jig coupling device with high centering accuracy and convenient use.
Disclosure of Invention
The invention solves the problems that: the problem that the traditional fatigue clamp is poor in threaded connection centering performance and seriously affects the test result is solved, the flange plate connecting structure is complex although having good centering precision, occupies a limited space in a testing machine, and once the flange plate connecting structure is installed in the clamp, the circumferential direction of the clamp cannot be adjusted, so that additional torsion can be caused to a sample. Therefore, the invention provides the high-centering-precision clamp connecting device for the testing machine, so that the reliability of the test result of the material test is realized, and the support is provided for ensuring the accuracy of the test data.
In order to solve the problems, the invention provides a high-centering-precision clamp connecting device for a mechanical testing machine, which comprises a fixing part 1, a connecting part 2 and a clamping part 3; the method is characterized in that:
the fixing part 1 comprises a positioning concave conical surface 6 and a reverse thread external thread 7; one end of the counter external thread 7 adjacent to the positioning concave conical surface 6 is connected with the other end of the coupling part 2. Wherein, the positioning concave conical surface 6 is used for realizing the accurate positioning function.
The connecting part 2 comprises a reverse internal thread 8 and an orthodontic internal thread 9, the connecting part 2 is a connecting sleeve, and the connecting fit of the two independent component fixing parts 1 and the clamping part 3 is realized through the reverse internal thread 8 and the orthodontic internal thread 9.
The reverse internal thread 8 is used for being matched with the reverse external thread 7, and the positive internal thread 9 is used for being matched with the positive external thread 5.
The clamping part 3 comprises a positioning convex conical surface 4 and an orthodontic external thread 5; one end of the external orthodontic thread 5 adjacent to the positioning convex conical surface 4 is connected with the connecting part 2; the positioning convex conical surface 4 is used for realizing a precise positioning function;
furthermore, one end of the fixing part with the positioning concave conical surface 6 is embedded with one end of the clamping part with the positioning convex conical surface 4, and the axial position of the clamping part is adjusted by adjusting the rotating angle of the clamping part.
Further, the convex conical surface area of one end of the clamping part with the positioning convex conical surface accounts for 60% of the total cylindrical surface.
The invention has the following advantages: the high-centering-precision clamp connecting device for the testing machine can ensure the centering property of a tested piece during clamping, ensure the stress of the tested piece along the axial direction of the sample in the testing process, ensure the stress condition of the tested piece to be closer to the actual working condition, and further better ensure the accuracy and reliability of the testing result.
Drawings
FIG. 1 is a schematic view of the assembly of the high centering fixture coupling of the present invention.
Figure 2 is a cross-sectional view of the high centering fixture coupling assembly of the present invention.
FIG. 3 is a schematic view of the clamping portion of the present invention.
FIG. 4 is a schematic axial view of the clamp of the present invention.
FIG. 5 is a schematic axial view of the fixing portion of the present invention.
FIG. 6 is a cross-sectional schematic view of the coupling portion of the present invention.
FIG. 7 is a schematic view of the structure of the coupling portion on the shaft side of the present invention.
The numbers in the figures illustrate the following:
a fixed part 1; a coupling part 2; a clamping portion 3; positioning the convex conical surface 4; an orthodontic external thread 5; positioning the concave conical surface 6; a counter external thread 7; 8-reverse thread internal thread; 9-orthodontic internal threads.
Detailed Description
Referring to fig. 1 to 6, the high centering precision clamp coupling device for a testing machine of the present invention includes a fixing portion 1, a coupling portion 2, and a clamping portion 3.
The fixing part 1 comprises a structure with a positioning concave conical surface 6 on the end surface and a reverse thread external thread 7 adjacent to the positioning concave conical surface, wherein the concave conical surface 6 is used for realizing accurate positioning, and the reverse thread external thread 7 is connected with one end of the connecting part 2 with a reverse thread internal thread 8. Clamping part 3 includes that the terminal surface has location convex cone face 4 and the positive tooth screw thread 5 of the adjacent location convex cone face, and wherein convex cone face 4 is used for realizing accurate locate function, and positive tooth screw thread 5 links to each other with the one end that coupling part 2 has positive tooth internal thread 9, and the location convex cone face 4 adds 60% of its conical surface area accounting for total cylinder area when man-hour, through the adjustable clamping part axial displacement of rotatory clamping part 3. The coupling part 2 includes a counter female screw 8 and a counter female screw 9, and the coupling part 2 is a coupling sleeve as shown in fig. 7, and the coupling engagement of the two separate component fixing parts 1 and the holding part 3 is achieved by the counter female screw 8 and the counter female screw 9.
When the high-centering-precision clamp connecting device for the testing machine is used for testing, one end of the fixing part 1 is fixed on a testing table, one end of the fixing part 1, which is provided with the positioning concave conical surface 6 and the reverse thread 7 adjacent to the positioning concave conical surface 6, is connected with one end of the connecting part 2, which is provided with the reverse thread 8, so that the thread rotates to a proper position and stops; connecting one end of the clamping part 3 with a positioning convex conical surface 4 and an orthodontic external thread 5 close to the positioning convex conical surface 4 with one end of the connecting part 2 with an orthodontic internal thread 9, and enabling the convex conical surface 4 to be embedded with the concave conical surface 6; then the sample is arranged on the connecting rod at the other end of the clamping part 3, and the horizontal deflection angle of the sample can be adjusted by adjusting the axial position of the clamping part 3 when the sample is arranged, so that other external force effects except the axial force of the sample are eliminated; and connecting the sample with the connecting rod end of the clamping part 3 by using a pin, and finishing the sample installation.
The above description is a preferred embodiment of the present invention, which can be used in the field of material testing equipment, but is not limited to this, and also covers other industries requiring high centering precision connection between parts.
Claims (3)
1. A high-centering-precision clamp connecting device for a mechanical testing machine comprises a fixing part, a connecting part and a clamping part; the method is characterized in that:
the fixing part comprises a positioning concave conical surface and a reverse thread; one end of the reverse external thread close to the positioning concave conical surface is connected with one end of the connecting part; the positioning concave conical surface is used for realizing the accurate positioning function;
the connecting part comprises a reverse internal thread and an orthodontic internal thread, the connecting part is a connecting sleeve, and the connecting fit of the fixing parts and the clamping parts of the two independent components is realized through the reverse internal thread and the orthodontic internal thread;
the reverse internal thread is used for being matched with the reverse external thread, and the orthodontic internal thread is used for being matched with the orthodontic external thread;
the clamping part comprises a positioning convex conical surface and an orthodontic external thread; one end of the orthodontic external thread adjacent to the positioning convex conical surface is connected with the connecting part; the positioning convex conical surface is used for realizing the accurate positioning function.
2. The high centering precision clamp coupling device for the mechanical testing machine according to claim 1, characterized in that: the end of the fixing part with the positioning concave conical surface is embedded with the end of the clamping part with the positioning convex conical surface, and the axial position of the clamping part is adjusted by adjusting the rotating angle of the clamping part.
3. The high centering precision clamp coupling device for the mechanical testing machine according to claim 1, characterized in that: the area of the convex conical surface at one end of the clamping part with the positioning convex conical surface accounts for 60 percent of the total cylindrical surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711389672.6A CN108287109B (en) | 2017-12-21 | 2017-12-21 | High-centering-precision clamp connecting device for mechanical testing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711389672.6A CN108287109B (en) | 2017-12-21 | 2017-12-21 | High-centering-precision clamp connecting device for mechanical testing machine |
Publications (2)
| Publication Number | Publication Date |
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| CN108287109A CN108287109A (en) | 2018-07-17 |
| CN108287109B true CN108287109B (en) | 2020-10-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711389672.6A Active CN108287109B (en) | 2017-12-21 | 2017-12-21 | High-centering-precision clamp connecting device for mechanical testing machine |
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| CN (1) | CN108287109B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110441136B (en) * | 2019-09-25 | 2024-03-12 | 吉林大学 | Stretching-twisting composite clamp based on positive and negative thread structure |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1188687C (en) * | 2003-04-03 | 2005-02-09 | 上海交通大学 | Method of testing pipe thread adaptor inner / external screw thread surface contact status distribution |
| CN202562804U (en) * | 2012-05-28 | 2012-11-28 | 江苏省沙钢钢铁研究院有限公司 | Connecting device used by hydraulic cylinder clamp of fatigue-testing machine |
| CN202752779U (en) * | 2012-06-19 | 2013-02-27 | 河北宣化工程机械股份有限公司 | Swing frame middle rib quick centring device of bulldozer traveling system |
| CN104274976B (en) * | 2013-07-10 | 2016-08-10 | 苏郁哲 | The wheel axle fixing structure of slide plate |
| CN204992903U (en) * | 2015-10-12 | 2016-01-20 | 无锡市宏霸机电设备有限公司 | Two electric putter structures |
| CN105466761B (en) * | 2015-12-15 | 2018-01-12 | 浙江大学 | The automatic centring device of metal stretching sample in low temperature environment chamber |
| CN206618607U (en) * | 2017-02-14 | 2017-11-07 | 广东省新材料研究所 | A kind of fixture for prepares coating bond strength test sample |
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| CN108287109A (en) | 2018-07-17 |
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