CN210665278U - Stretching-twisting composite clamp based on positive and negative thread structure - Google Patents
Stretching-twisting composite clamp based on positive and negative thread structure Download PDFInfo
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- CN210665278U CN210665278U CN201921601222.3U CN201921601222U CN210665278U CN 210665278 U CN210665278 U CN 210665278U CN 201921601222 U CN201921601222 U CN 201921601222U CN 210665278 U CN210665278 U CN 210665278U
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- 238000004154 testing of material Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 2
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Abstract
The utility model relates to a tensile-twist reverse compound anchor clamps based on positive and negative tooth helicitic texture belongs to material test technical field. Reliable clamping of the test specimen can be achieved in quasi-static and high-frequency dynamic tensile-torsional composite load loaded material test experiments, and the high-frequency dynamic loading includes but is not limited to zero-crossing loading. Comprises a clamp shell part, a clamping part and an expansion part. The rear end of a clamp cup seat in the shell part is connected with the tension and torsion composite sensor through a flange; the clamping part consists of two nuts with different diameters and opposite rotating directions and is connected with the clamp cup seat through a flat key pair and an expansion part; the expansion part is used for adjusting the locking degree of the inner end nut. Has the advantages that: the clamping of the sample can be realized in a mechanical connection mode under the quasi-static and high-frequency dynamic tension-torsion composite load loading condition. The universal joint has the advantages of good universality, low cost and convenient maintenance, and has important prospects in application in extremely high-temperature and extremely low-temperature environments and limited spaces.
Description
Technical Field
The utility model relates to a material test technical field, in particular to, tensile-twist reverse compound anchor clamps based on positive and negative tooth helicitic texture can be applied to tensile, twist reverse the quasi-static state or the high frequency dynamic loading test of two kinds of mechanical form couplings or single load.
Background
Engineering materials often bear mechanical loads of various different forms under actual service conditions, along with development of material testing technologies and improvement of material testing requirements of engineering practical application, a traditional single-load material performance testing machine and part of matched instrument equipment cannot meet increasingly rich material testing requirements, and a series of multi-load multi-physical-field coupling material testing test instruments are produced. Common test fixtures are classified into hydraulic fixtures and mechanical fixtures. The hydraulic clamp compresses a sample through the wedge block, realizes that clamping can be used for pull-torsion composite tests and fatigue tests after being modified, but the defects of high cost, multiple auxiliary elements, difficult maintenance and the like are difficult to improve all the time, and in addition, in physical fields of extremely high temperature, extremely low temperature, strong electricity, strong magnetism and the like, the hydraulic clamp is often subjected to the toggle of the environment and cannot meet the use requirements at all. The mechanical fixture clamps the sample through self-locking of the wedge block or threads, and has the advantages of simple structure, low cost and convenience in maintenance. But can realize clamping under the compound mechanical load, and especially can be applied to the mechanical type anchor clamps of high frequency zero passage load test and be few. In general, the mechanical fixture which can be used for stretching and twisting composite loads and can be generally used for quasi-static loading and high-frequency dynamic loading tests is designed, and the mechanical fixture has great engineering significance.
Disclosure of Invention
An object of the utility model is to provide a tensile-twist reverse compound anchor clamps based on positive and negative tooth helicitic texture solves the above-mentioned problem that exists at the material test field prior art. The utility model discloses can be in the quasi-static and high frequency dynamic tensile-twist reverse loaded material test experiment, the centre gripping is realized to the sample to effective reliable. The device has the advantages of good universality, low cost, convenience in maintenance, simplicity in use and the like.
The above object of the utility model is realized through following technical scheme:
the tensile-torsional composite clamp based on the positive and negative thread structure can clamp a sample in a material test experiment loaded by tensile-torsional composite load of quasi-static and high-frequency dynamic loading, and the high-frequency dynamic loading comprises but is not limited to zero-crossing loading; the inner end nut 3 and the outer end nut 2 are different in diameter and opposite in rotating direction, and the inner diameter of the inner end nut 3 is larger than that of the outer end nut 2, so that a sample is clamped in a threaded mode; the outer end nut 2 is connected with the clamp cup seat 1 through four flat keys 9 which are uniformly distributed, so that the outer end nut 2 is limited in the circumferential direction and the radial direction; the inner end nut 3 is connected with the clamp cup seat 1 through an expansion part, the expansion part consists of an expansion inner bushing 5 and an expansion outer bushing 4, an adjusting bolt group 8 compresses the expansion inner bushing 5 and the expansion outer bushing 4 through a pressure plate 7, and the inner end nut 3 and the outer end nut 2 can be limited in the circumferential direction and the radial direction after the adjusting bolt group 8 is screwed; the clamping bolt group 6 is fixedly connected with the clamp cup holder 1 through the pressure plate 7 to realize clamping, and the inner end nut 3 and the outer end nut 2 can be limited in the axial direction after the clamping bolt group 6 is screwed.
The rear end of the clamp cup seat 1 is provided with a flange hole, and the flange hole is fixedly connected with a main shaft applying tension-torsion load in a test device through a bolt group.
The press plate 7 is provided with circular array counter bores which are divided into two groups and are arranged at intervals in groups.
The inner end nut 3 and the outer end nut 2 are respectively connected with the sample through thread pairs with different diameters and opposite screwing directions, and the tested sample is clamped.
The clamping section of the sample is provided with external threads with different diameters and opposite rotation directions, and specifically comprises the following steps: the thread section on the sample close to the gauge length section is screwed with the inner end nut 3, and the thread section far away from the gauge length section is screwed with the outer end nut 2; the screwing direction of the thread section screwed with the inner end nut 3 on the same sample is the same, and the screwing direction of the thread section screwed with the outer end nut 2 on the same sample is different from the screwing direction of the thread section screwed with the inner end nut 3; the nominal diameter of the thread section screwed with the outer end nut 2 on the same sample is smaller than the nominal diameter of the thread section screwed with the inner end nut 3, and the inner end nut 3 can be smoothly screwed in.
The beneficial effects of the utility model reside in that: novel conception, simple structure and convenient use. The device can realize reliable clamping of the sample in quasi-static and high-frequency dynamic tensile-torsional composite load loading material mechanical property tests, and can complete zero-crossing high-frequency dynamic loading tests. The device has the advantages of good universality, low cost, convenience in maintenance, simplicity in use and the like. The practicability is strong.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate example embodiments of the invention and together with the description serve to explain the invention without limitation.
FIG. 1 is a schematic sectional view of the present invention;
FIG. 2 is a schematic view of the overall structure of the present invention;
fig. 3 is a schematic structural diagram of the sample according to the present invention;
FIG. 4 is a schematic structural view of the fixture cup of the present invention;
fig. 5 is a schematic view of the overall structure split of the present invention.
In the figure: 1. a clamp cup holder; 2. an outer end nut; 3. an inner end nut; 4. expanding the outer bushing; 5. expanding and tightening the inner bushing; 6. clamping the bolt set; 7. a platen; 8. adjusting the bolt group; 9. a flat bond.
Detailed Description
The details of the present invention and its embodiments are further described below with reference to the accompanying drawings.
Referring to fig. 1 to 5, the tensile-torsional composite clamp based on the positive and negative thread structure of the present invention can reliably clamp a sample in a material test with a quasi-static and high-frequency dynamic tensile-torsional composite load, and the high-frequency dynamic load includes, but is not limited to, zero-crossing loading. The clamp includes a clamp housing portion, a clamping portion, and an expansion portion. The rear end of a clamp cup seat in the shell part is connected with the tension and torsion composite sensor through a flange; the clamping part consists of two inner end nuts and two outer end nuts with different diameters and opposite rotating directions, realizes threaded clamping on a sample, and is connected with the clamp cup seat through a flat key pair and an expansion part; the expansion part is used for adjusting the locking degree of the inner end nut. The fixture has the advantages that: the clamping of the sample can be realized in a mechanical connection mode under the quasi-static and high-frequency dynamic tension-torsion composite load loading condition. The universal hydraulic clamp has the advantages of good universality, low cost and convenience in maintenance, and has important prospects in application in extremely high-temperature and extremely low-temperature environments and limited spaces compared with hydraulic clamps with the same functions.
Referring to fig. 1 to 5, the stretching-twisting composite fixture based on the positive and negative thread structure of the present invention has the following specific structure: a flange hole is processed at the rear end of the clamp cup seat 1 and is fixedly connected with a main shaft applying tension-torsion load in a test device through a bolt group; the clamp cup seat 1 is connected with the outer end nut 2 through evenly distributed flat keys 9, so that the outer end nut 2 is limited in the circumferential direction (circumferential direction) and the radial direction (diameter direction); the clamping bolt group 6 is fixedly connected with the clamp cup base 1 through the pressure plate 7 to realize clamping, and the inner end nut 3 and the outer end nut 2 can be limited in the axial direction (the rotation axis direction) after the clamping bolt group 6 is screwed; the adjusting bolt group 8 compresses the expansion inner bushing 5 and the expansion outer bushing 4 through the pressure plate 7, and the inner end nut 3 can be limited in the circumferential direction and the radial direction after the adjusting bolt group 8 is screwed; the inner end nut 3 and the outer end nut 2 are respectively connected with the sample through thread pairs with different diameters and opposite screwing directions, and the sample to be tested is clamped.
Referring to fig. 1, during clamping, the inner end nut 3 and the sample are screwed to a proper position, specifically, the end surface of the outer end nut 2 is tightly abutted to the end surface of the inner end nut 3 after being screwed, but is not contacted with the two stepped thread shoulders of the sample.
Referring to fig. 2, the platen 7 is machined with circular arrays of counterbores divided into two groups and spaced apart in groups.
Referring to fig. 2, the inner end nut 2 and the outer end nut 3 may be national standard round nuts according to the national standard GB 812.
Referring to fig. 3, the sample clamping section to which the tension-torsion composite clamp based on the positive and negative thread structure is applied should be provided with external threads with different diameters and opposite rotation directions, specifically: the thread section on the sample close to the gauge length section is screwed with the inner end nut 3, and the thread section far away from the gauge length section is screwed with the outer end nut 2; the screwing direction of the thread section screwed with the inner end nut 3 on the same sample is the same, and the screwing direction of the thread section screwed with the outer end nut 2 on the same sample is different from the screwing direction of the thread section screwed with the inner end nut 3; the nominal diameter of the thread section screwed with the outer end nut 2 on the same sample is smaller than the nominal diameter of the thread section screwed with the inner end nut 3, and the inner end nut 3 can be smoothly screwed in.
Referring to fig. 4, the flat key 9 is fitted with a corresponding key slot on the clamp cup 1 in an interference fit.
Referring to fig. 5, the sample is clamped on both sides during the experiment, and the clamping manner is the same on both sides, so one side is taken as an example for explanation. The specific clamping sequence and mode are as follows: firstly, screwing an inner end nut 3 and a thread clamping section on a sample, which is close to a gauge length section, to be proper; secondly, the outer end nut 2 and a thread clamping section on the sample, which is far away from the gauge length section, are screwed to be close to the end surface of the inner end nut 3; adjusting the outer end nut 2 and the clamp cup seat 1 again, and connecting the outer end nut and the clamp cup seat by uniformly distributed flat keys 9; then adjusting the position of a pressure plate 7, screwing in a clamping bolt group 6 to fixedly connect the clamping bolt group with the clamp cup base 1 through the pressure plate 7 to realize clamping, and realizing the limit of the inner end nut 3 and the outer end nut 2 in the axial direction; finally, the adjusting bolt group 8 is screwed in to tightly press the expansion inner bushing 5 and the expansion outer bushing 4 through the pressure plate 6, and the inner end nut 3 is limited in the circumferential direction and the radial direction.
In the process of a tensile experiment, a tensile force is transmitted to the clamp from a main shaft applying a tensile-torsional load in the test device through a flange at the rear end of the clamp cup seat 1 and a bolt group, and the tensile force can be transmitted to a sample through the outer end nut 2 and the inner end nut 3 due to the fact that no degree of freedom exists among the clamp cup seat 1, the outer end nut 2, the inner end nut 3 and the pressure plate 7 in the axial direction, so that the purpose of reliable clamping is achieved. The compression experiment process is the same as the principle.
In the high-frequency dynamic loading experiment process, the high-frequency dynamic loading experiment process is divided into conventional loading and zero-crossing loading. The working principle of the conventional high-frequency dynamic loading test is the same as that of the tensile test and the compression test, so the details are not repeated herein; in the high-frequency dynamic zero-crossing loading test process, fatigue load is transmitted to the clamp by the test instrument through the flange at the rear end of the clamp cup seat 1 and the bolt group, and because no degree of freedom exists among the clamp cup seat 1, the outer end nut 2, the inner end nut 3 and the pressure plate 7 in the axial direction, the tensile force can be converted from positive to negative in the zero-crossing loading process without loss, so that the purpose of reliable clamping is achieved.
In the torsion test process, the torque is transmitted to the clamp by a test instrument through a flange at the rear end of the clamp cup seat 1 and a bolt group, the clamp cup seat 1 and the outer end nut 2 are connected through evenly distributed flat keys 9 to transmit the torque, the clamp cup seat 1 and the inner end nut 3 are connected through an expansion part to transmit the torque, the outer end nut 2 and the inner end nut 3 can generate displacement trends with opposite directions in the axial direction due to different rotation directions under the action of the torque, namely, the extrusion or deviation of the two elements can be shown, but the outer end nut 2, the inner end nut 3 and the pressure plate 7 are not free of freedom in the axial direction, so that the extrusion or deviation of the outer end nut 2 and the inner end nut 3 is inhibited, the torque is transmitted to a sample, and the purpose of reliable clamping is achieved.
The above description is only a preferred example of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made to the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The utility model provides a tensile-twist reverse compound anchor clamps based on positive and negative tooth helicitic texture which characterized in that: the clamping of the test sample can be completed in a material test experiment of quasi-static and high-frequency dynamic loading tensile-torsional composite load loading, and the high-frequency dynamic loading comprises zero-crossing loading; the inner end nut (3) and the outer end nut (2) are different in diameter and opposite in rotating direction, and the inner diameter of the inner end nut (3) is larger than that of the outer end nut (2), so that a sample is clamped in a threaded mode; the outer end nut (2) is connected with the clamp cup seat (1) through four evenly distributed flat keys (9), so that the outer end nut (2) is limited in the circumferential direction and the radial direction; the inner end nut (3) is connected with the clamp cup seat (1) through an expansion part, the expansion part consists of an expansion inner bushing (5) and an expansion outer bushing (4), an adjusting bolt group (8) compresses the expansion inner bushing (5) and the expansion outer bushing (4) through a pressure plate (7), and the inner end nut (3) and the outer end nut (2) can be limited in the circumferential direction and the radial direction after the adjusting bolt group (8) is screwed; the clamping bolt group (6) is fixedly connected with the clamp cup seat (1) through the pressure plate (7) to realize clamping, and the inner end nut (3) and the outer end nut (2) are limited in the axial direction.
2. The positive and negative thread structure-based stretch-twist composite clamp of claim 1, wherein: the rear end of the clamp cup seat (1) is provided with a flange hole, and the flange hole is fixedly connected with a main shaft applying tension-torsion load in a test device through a bolt group.
3. The positive and negative thread structure-based stretch-twist composite clamp of claim 1, wherein: the press plate (7) is provided with circular array counter bores which are divided into two groups and are arranged at intervals in groups.
4. The positive and negative thread structure-based stretch-twist composite clamp of claim 1, wherein: the inner end nut (3) and the outer end nut (2) are respectively connected with the sample through thread pairs with different diameters and opposite rotation directions, and the tested sample is clamped.
5. The positive and negative thread structure-based stretch-twist composite jig of claim 1 or 4, wherein: the clamping section of the sample is provided with external threads with different diameters and opposite screwing directions, and specifically comprises the following steps: the thread section on the sample, which is close to the gauge length section, is screwed with the inner end nut (3), and the thread section on the sample, which is far from the gauge length section, is screwed with the outer end nut (2); the screwing direction of the thread section screwed with the inner end nut (3) on the same sample is the same, and the screwing direction of the thread section screwed with the outer end nut (2) on the same sample is different from the screwing direction of the thread section screwed with the inner end nut (3); the nominal diameter of the thread section screwed with the outer end nut (2) on the same sample is smaller than the nominal diameter of the thread section screwed with the inner end nut (3), and the inner end nut (3) can be smoothly screwed in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921601222.3U CN210665278U (en) | 2019-09-25 | 2019-09-25 | Stretching-twisting composite clamp based on positive and negative thread structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921601222.3U CN210665278U (en) | 2019-09-25 | 2019-09-25 | Stretching-twisting composite clamp based on positive and negative thread structure |
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| Publication Number | Publication Date |
|---|---|
| CN210665278U true CN210665278U (en) | 2020-06-02 |
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|---|---|---|---|
| CN201921601222.3U Withdrawn - After Issue CN210665278U (en) | 2019-09-25 | 2019-09-25 | Stretching-twisting composite clamp based on positive and negative thread structure |
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| CN (1) | CN210665278U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110441136A (en) * | 2019-09-25 | 2019-11-12 | 吉林大学 | Stretching based on positive and negative pitch thread structure-torsion composite fixture |
-
2019
- 2019-09-25 CN CN201921601222.3U patent/CN210665278U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110441136A (en) * | 2019-09-25 | 2019-11-12 | 吉林大学 | Stretching based on positive and negative pitch thread structure-torsion composite fixture |
| CN110441136B (en) * | 2019-09-25 | 2024-03-12 | 吉林大学 | Stretching-twisting composite clamp based on positive and negative thread structure |
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Granted publication date: 20200602 Effective date of abandoning: 20240312 |
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