CN115383651A - Anti-torsion clamp for fatigue test - Google Patents
Anti-torsion clamp for fatigue test Download PDFInfo
- Publication number
- CN115383651A CN115383651A CN202211203150.3A CN202211203150A CN115383651A CN 115383651 A CN115383651 A CN 115383651A CN 202211203150 A CN202211203150 A CN 202211203150A CN 115383651 A CN115383651 A CN 115383651A
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- oil
- cylinder
- hydraulic cylinder
- sample
- large hydraulic
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- 238000009661 fatigue test Methods 0.000 title claims abstract description 27
- 239000012530 fluid Substances 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims 1
- 239000007924 injection Substances 0.000 claims 1
- 239000003921 oil Substances 0.000 description 87
- 238000012360 testing method Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 5
- 238000005452 bending Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses an anti-twisting clamp for a fatigue test, which comprises a hydraulic driving device and two clamping components which are coaxially and symmetrically arranged; the clamping assembly comprises a large hydraulic cylinder, a sample back cap is arranged at the end part of the large hydraulic cylinder, a circumferential positioning mechanism matched with the large hydraulic cylinder is formed on the sample back cap, a pull rod back cap is sleeved on the outer side of the sample back cap and connected with the large hydraulic cylinder, a plunger is arranged on a piston of the large hydraulic cylinder, the hydraulic driving device comprises an oil cylinder, a small hydraulic cylinder and an oil pipe, the small hydraulic cylinder is connected with the oil cylinder, the oil pipe is connected with the small hydraulic cylinder, the oil pipe is respectively connected with two large hydraulic cylinders, and the two large hydraulic cylinders are used for being connected with a fatigue testing machine; two big pneumatic cylinders are connected with fatigue testing machine, and the both ends of sample are passed through circumference positioning mechanism and are connected with two clamping subassemblies, can avoid frictional force to conduct torsion to sample back of the body cap on, lead to the sample to produce torsion, guarantee experimental accuracy nature and validity.
Description
Technical Field
The invention relates to the technical field of mechanical performance testing, in particular to an anti-torsion clamp for a fatigue test.
Background
At present, the axial fatigue testing machine clamping sample usually adopts the threaded connection mode, the pull rod nut is installed at the two ends of the sample firstly, then the sample nut is installed, the sample nut is clamped on the testing machine pull rod through the pull rod nut, and the pull rod nut is screwed by a spanner, so that the pull rod nut compresses the sample nut, the sample end surface and the pull rod end surface are in close contact to eliminate the clamping gap, friction force is generated on the sample nut when the pull rod nut is screwed by the spanner, further the sample generates torsion, bending torsion force when the pull rod nut is screwed by the spanner is generated on a sample clamping system of the testing machine, the coaxiality of the sample clamping is influenced, and meanwhile, the mechanical property data of the sample are also influenced.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the anti-torsion clamp for the fatigue test, which reduces the influence of torsion on a sample and improves the test precision.
The invention is realized by the following technical scheme:
an anti-twist clamp for a fatigue test comprises a hydraulic driving device and two clamping components which are coaxially and symmetrically arranged;
the clamping assembly comprises a large hydraulic cylinder, a sample back cap used for connecting a sample is arranged at the end part of the large hydraulic cylinder, a circumferential positioning mechanism matched with the large hydraulic cylinder is formed on the sample back cap, a pull rod back cap is sleeved on the outer side of the sample back cap and connected with the large hydraulic cylinder and used for pressing the pull rod back cap on the end part of the large hydraulic cylinder, a piston of the large hydraulic cylinder is provided with a top core, and the top core is abutted against the end part of the sample under pressure;
the hydraulic driving device comprises an oil cylinder, a small hydraulic cylinder and an oil pipe, the small hydraulic cylinder is connected with the oil cylinder, the oil pipe is connected with the small hydraulic cylinder, the oil pipe is respectively connected with two large hydraulic cylinders, and the two large hydraulic cylinders are connected with the fatigue testing machine.
Preferably, the circumferential positioning mechanism comprises a positioning boss and a clamping groove matched with the positioning boss, the positioning boss is arranged at the end part of the sample back cap, and the clamping groove is arranged at the end part of the cylinder body of the large hydraulic cylinder.
Preferably, the center of the pull rod back cap is provided with a threaded hole, the end part of the threaded hole is provided with a compression ring, the pull rod back cap is connected with the outer wall of the large hydraulic cylinder through threads, and the compression ring is pressed on the end face of the sample back cap far away from one end of the large hydraulic cylinder.
Preferably, the small hydraulic cylinder comprises a piston cylinder, a small piston and a one-way valve;
the small piston is arranged in the piston cylinder, the end part of the piston cylinder is communicated with the oil cylinder through two one-way valves, one-way valve is connected with one end of the oil suction pipe, the other end of the oil suction pipe extends into the oil cylinder, the other one-way valve is connected with one end of the oil outlet pipe, and the other end of the oil outlet pipe penetrates through the oil cylinder to be connected with oil inlets of the two large hydraulic cylinders.
Preferably, the fluid control directions of the two check valves are opposite.
Preferably, the other end of the oil outlet pipe penetrates through the oil cylinder and is connected with oil inlets of the two large hydraulic cylinders through a tee joint.
Preferably, the oil outlet pipe is provided with a pressure gauge for measuring the pressure of the large hydraulic cylinder.
Preferably, the small piston is connected with the lever handle through a connecting rod mechanism.
Preferably, an oil filling opening is formed in the oil cylinder.
Preferably, the oil cylinder is provided with a pressure release valve, an inlet of the pressure release valve is communicated with the oil outlet pipe through a pipeline, an outlet of the pressure release valve is connected with an oil return pipe, and the oil return pipe is positioned in the oil cylinder.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the anti-torsion clamp for the fatigue test, the positioning boss of the sample back cap is assembled with the clamping groove at the end part of the cylinder body of the large hydraulic cylinder, so that the sample back cap is prevented from rotating, the sample is prevented from being subjected to torsion, the sample is clamped and tightly pushed by adopting a hydraulic principle, a wrench is not used for clamping the sample, the clamping damage caused by over-tightening of the clamping due to personnel difference is reduced, the test failure caused by over-loosening of the clamping is avoided, meanwhile, the bending torsion force generated on a test sample clamping system of the testing machine when the pull rod back cap is tightly backed by the wrench is avoided, the coaxiality of the sample clamping is ensured, the sample is not subjected to torsion in the whole clamping process, the clamping precision is further ensured, and the test accuracy and effectiveness are finally ensured.
Drawings
FIG. 1 is a schematic structural view of a sample back cap according to the present invention;
FIG. 2 is a front view of a sample back cap of the present invention;
FIG. 3 is a schematic structural view of the pull rod back cap of the present invention;
FIG. 4 is a front view of the pull rod back cap of the present invention;
FIG. 5 is a block diagram of the hydraulic cylinder of the present invention;
FIG. 6 is an external view of the hydraulic cylinder of the present invention;
fig. 7 is a schematic structural view of the anti-twist clamp of the present invention.
In the figure: 1. an oil outlet pipe; 2. an oil return pipe; 3. a pressure relief valve; 4. an oil filling port; 5. a pressure gauge; 6. a tee joint; 7. a first oil pipe; 8. a flange; 9. a large hydraulic cylinder; 10. a large piston; 11. a seal ring; 12. a cylinder body; 13. a top core; 14. a pull rod back cap; 15. carrying a cap on the sample; 16. a sample; 17. a second oil pipe; 18. a one-way valve; 19. a small piston; 20. a small hydraulic cylinder; 21. an oil suction pipe; 22. an oil cylinder; 22. a lever handle; the boss is positioned 23.
Detailed Description
The present invention will now be described in further detail with reference to the attached drawings, which are illustrative, but not limiting, of the present invention.
Referring to fig. 1-7, an anti-twist clamp for fatigue tests comprises a hydraulic driving device and two clamping assemblies which are coaxially and symmetrically arranged, and a test sample 16 is positioned between the two clamping assemblies.
The clamping assembly comprises a large hydraulic cylinder 9, a large piston 10 is arranged in the large hydraulic cylinder 9, the large piston 10 is connected with a cylinder body 12 in a sealing mode through a sealing ring 11, a top core 13 is arranged at the end portion of the large piston 10, a sample back cap 15 is arranged at the piston end of the large hydraulic cylinder 9, the sample back cap 15 is used for connecting the end portion of a sample, a pull rod back cap 14 is sleeved on the outer side of the sample back cap 15, and the pull rod back cap 14 is connected with the large hydraulic cylinder 9 and used for press-mounting the pull rod back cap 14 at the end portion of the large hydraulic cylinder 9.
The hydraulic driving device comprises an oil cylinder 22, a small hydraulic cylinder 20 and an oil pipe, wherein the small hydraulic cylinder 20 is connected with the oil cylinder 22, the oil pipe is connected with the small hydraulic cylinder 20, the oil pipe is respectively connected with two large hydraulic cylinders 9, and the fixed ends of the large hydraulic cylinders 9 are provided with flanges 8 for connecting a fatigue testing machine.
The link of sample is provided with the external screw thread, is provided with the screw hole on the sample back of the body cap, and sample back of the body cap 15 passes through the end connection of screw thread with sample 16, and the one end of sample back of the body cap 15 is provided with the location boss 23 with big pneumatic cylinder 9 tip matched with, and the cylinder body tip of big pneumatic cylinder 9 is provided with the draw-in groove, and the location boss 23 imbeds in the draw-in groove of the big pneumatic cylinder 9 tip, realizes sample and the coaxial setting of big pneumatic cylinder 9, carries the 15 circumference location of sample back of the body cap simultaneously.
The center of the pull rod back cap 14 is provided with a threaded hole, the end part of the threaded hole is provided with a pressing ring, the pull rod back cap 14 is sleeved on the outer wall of the sample back cap 15, the pull rod back cap 14 is connected with the outer wall of the large hydraulic cylinder 9 through threads, and the pressing ring is pressed on the end face of the sample back cap 15 far away from one end of the large hydraulic cylinder 9. The pull rod back cap 14 is connected with the cylinder body 12 of the large hydraulic cylinder 9 through threads, and in the rotating process, when the end face of the pressing ring is in contact with the end face of the sample back cap 15, when the pull rod back cap 14 is continuously rotated, the positioning boss positions the sample back cap, so that when the pull rod back cap 14 is locked, the friction force can be prevented from conducting the torsion force to the sample back cap 15, and the torsion force is generated on a sample 16.
The small hydraulic cylinder 20 comprises a piston cylinder, a small piston 19, check valves 18 and a lever handle 22, the small piston is arranged in the piston cylinder, the small piston 19 is connected with the lever handle 22 through a connecting rod mechanism, the end part of the piston cylinder is connected with the oil cylinder, two check valves 18 are arranged at the joint, the fluid control directions of the two check valves are opposite, one check valve is connected with one end of an oil suction pipe 21, the other end of the oil suction pipe 21 extends into the oil cylinder 22, the other check valve is connected with one end of an oil outlet pipe 1, the other end of the oil outlet pipe 1 penetrates through the oil cylinder to be connected with an oil inlet of a tee joint 6, one oil outlet of the tee joint 6 is connected with an oil inlet of one large hydraulic cylinder 9 through a first oil pipe 7, the other oil outlet of the tee joint 6 is connected with an oil inlet of the other large hydraulic cylinder 9 through a second oil pipe 17, and a pressure gauge 5 is arranged on the oil outlet pipe 1 and is located at the oil inlet of the tee joint.
When the small hydraulic cylinder 20 sucks oil, oil enters the piston cylinder through the oil suction pipe 21 and the check valve connected with the oil suction pipe, the check valve connected with the oil outlet pipe 1 is closed, leakage of the oil is avoided, when the small hydraulic cylinder 20 discharges the oil, the check valve connected with the oil suction pipe 21 is closed, the check valve connected with the oil outlet pipe is opened, and the oil in the small hydraulic cylinder 20 enters the oil outlet pipe through the check valve.
One end of the small piston extends out of the piston cylinder, the end portion of the small piston is hinged to the middle of a lever handle 22, one end of the end portion of the lever handle 22, which is hinged to a supporting rod, is connected, the other end of the supporting rod is connected with the oil cylinder, an oil filling port 4 and a pressure release valve 3 are further arranged on the oil cylinder 22, an inlet of the pressure release valve 3 is communicated with the oil outlet pipe 1 through a pipeline, an outlet of the pressure release valve 3 is connected with an oil return pipe 2, and the oil return pipe 2 is located in the oil cylinder.
The use method of the anti-twist clamp for the fatigue test is explained in detail below, and the specific method is as follows:
And 2, respectively installing sample back caps 15 at two ends of the sample through threads, wherein the positioning bosses of the sample back caps 15 are positioned outside the end parts of the sample.
And 3, coaxially arranging the two large hydraulic cylinders 9 on the axial fatigue testing machine through the flange 8, then installing the sample obtained in the step 2 between the two large hydraulic cylinders 9, and clamping the lug boss of the back cap of the sample into the clamping groove of the cylinder body.
And 4, connecting the pull rod back cap 14 with the end part of the cylinder body 12 of the large hydraulic cylinder through threads, and pressing the sample back cap on the end part of the cylinder body.
and 6, moving the lever handle 22 in a reverse direction, namely moving to one side of the oil cylinder to pressurize the inside of the small hydraulic cylinder, increasing the pressure in the small hydraulic cylinder, closing a one-way valve connected with the oil suction pipe, opening the one-way valve connected with the oil outlet pipe, inputting oil in the small hydraulic cylinder into the upper and lower large hydraulic cylinders through a tee joint and an oil pipe from the oil outlet pipe, and enabling the large piston to push the ejection core to move so that the end part of the ejection core is abutted against the end surface of the sample to finish clamping the sample.
The pressing force of the core against the sample is calculated from the pressure indication of the pressure gauge. If the pressure is reduced or the sample is loosened, hydraulic oil in the large hydraulic cylinder enters the oil cylinder through the oil pipe and the oil return pipe by adjusting the pressure relief valve. When the hydraulic oil is insufficient, oil is added through the oil filling port.
This an anti-twist clamp for fatigue test, through the positioning boss of sample back of the body cap and the draw-in groove assembly of the cylinder body tip of big pneumatic cylinder, it is rotatory to prevent sample back of the body cap, avoid the sample to receive torsion, owing to adopt the hydraulic pressure principle to carry out clamping tight to the sample, can not use the spanner to carry out the clamping of sample, the too tight damage anchor clamps of clamping that the reduction personnel difference arouses, the test failure that the clamping is too loose and is leaded to, the bending force of producing testing machine sample clamping system when avoiding simultaneously by the tight pull rod back of the body cap of spanner back of the body, the axiality of sample clamping has been guaranteed, whole clamping process sample does not receive torsion, and then its clamping precision has been guaranteed, finally guarantee its experimental precision and validity.
The above contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention should not be limited thereby, and any modification made on the basis of the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. An anti-twist clamp for a fatigue test is characterized by comprising a hydraulic driving device and two clamping components which are coaxially and symmetrically arranged;
the clamping assembly comprises a large hydraulic cylinder (9), a sample back cap (15) used for connecting a sample (16) is arranged at the end of the large hydraulic cylinder (9), a circumferential positioning mechanism matched with the large hydraulic cylinder (9) is formed on the sample back cap (15), a pull rod back cap (14) is sleeved on the outer side of the sample back cap (15), the pull rod back cap (14) is connected with the large hydraulic cylinder (9) and used for pressing the pull rod back cap (14) at the end of the large hydraulic cylinder (9), a top core (13) is arranged on a piston of the large hydraulic cylinder (9), and the top core (13) is abutted against the end of the sample (16) under pressure;
the hydraulic driving device comprises an oil cylinder (22), a small hydraulic cylinder (20) and an oil pipe, wherein the small hydraulic cylinder (20) is connected with the oil cylinder (22), the oil pipe is connected with the small hydraulic cylinder (20), the oil pipe is respectively connected with two large hydraulic cylinders (9), and the two large hydraulic cylinders are connected with a fatigue testing machine.
2. The anti-twisting clamp for the fatigue test is characterized in that the circumferential positioning mechanism comprises a positioning boss (23) and a clamping groove matched with the positioning boss, the positioning boss (23) is arranged at the end part of the sample back cap (15), and the clamping groove is arranged at the end part of the cylinder body of the large hydraulic cylinder (9).
3. The anti-twisting clamp for the fatigue test is characterized in that a threaded hole is formed in the center of the pull rod back cap (14), a pressing ring is arranged at the end of the threaded hole, the pull rod back cap (14) is connected with the outer wall of the large hydraulic cylinder (9) through threads, and the pressing ring is pressed on the end face, away from one end of the large hydraulic cylinder (9), of the sample back cap (15).
4. Anti-twist clamp for fatigue tests according to claim 1, characterized in that said small hydraulic cylinder (20) comprises a piston cylinder, a small piston (19) and a non-return valve (18);
the small piston is arranged in the piston cylinder, the end part of the piston cylinder is communicated with the oil cylinder through two one-way valves (18), one of the one-way valves is connected with one end of the oil suction pipe (21), the other end of the oil suction pipe (21) extends into the oil cylinder (22), the other one-way valve is connected with one end of the oil outlet pipe (1), and the other end of the oil outlet pipe (1) penetrates through the oil cylinder to be connected with oil inlets of the two large hydraulic cylinders.
5. The anti-twist clamp for fatigue testing as claimed in claim 4, wherein the two check valves have fluid control directions opposite to each other.
6. The anti-twisting clamp for the fatigue test is characterized in that the other end of the oil outlet pipe (1) penetrates through the oil cylinder and is connected with oil inlets of two large hydraulic cylinders through a tee joint (6).
7. The anti-twisting clamp for the fatigue test is characterized in that a pressure gauge (5) is arranged on the oil outlet pipe (1) and used for measuring the pressure of a large hydraulic cylinder.
8. The anti-twist clamp for fatigue tests according to claim 4, characterized in that the small piston (19) is connected with a lever handle (22) through a linkage.
9. The anti-twist clamp for fatigue test according to claim 1, wherein the oil cylinder (22) is provided with an oil injection port (4).
10. The anti-twisting clamp for the fatigue test according to claim 1, wherein the oil cylinder (22) is provided with a pressure release valve (3), an inlet of the pressure release valve (3) is communicated with the oil outlet pipe (1) through a pipeline, an outlet of the pressure release valve (3) is connected with the oil return pipe (2), and the oil return pipe (2) is located in the oil cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211203150.3A CN115383651A (en) | 2022-09-29 | 2022-09-29 | Anti-torsion clamp for fatigue test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211203150.3A CN115383651A (en) | 2022-09-29 | 2022-09-29 | Anti-torsion clamp for fatigue test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115383651A true CN115383651A (en) | 2022-11-25 |
Family
ID=84128931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211203150.3A Pending CN115383651A (en) | 2022-09-29 | 2022-09-29 | Anti-torsion clamp for fatigue test |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115383651A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006071511A (en) * | 2004-09-02 | 2006-03-16 | Hokkaido Technology Licence Office Co Ltd | Test piece holding structure for material testing machine |
| CN103712851A (en) * | 2013-12-20 | 2014-04-09 | 浙江大学 | High-pressure hydrogen environment fatigue test clamp for material testing machine |
| CN103884600A (en) * | 2012-12-20 | 2014-06-25 | 核工业西南物理研究院 | Large low-temperature fatigue experimental device for bolt |
| CN206192764U (en) * | 2016-10-20 | 2017-05-24 | 上海凯尔孚应力腐蚀试验设备有限公司 | Simple and easy zero passage fatigue test anchor clamps and system thereof |
| CN207616450U (en) * | 2017-12-25 | 2018-07-17 | 中国石油化工股份有限公司 | A kind of sucker rod fatigue test special fixture |
| CN111595695A (en) * | 2020-06-04 | 2020-08-28 | 上海交通大学 | Clearance elimination device and method suitable for low-temperature tension-compression fatigue test |
| CN212228570U (en) * | 2020-05-28 | 2020-12-25 | 济南友金机械设备有限公司 | Threaded type testing machine chuck |
| CN113001452A (en) * | 2021-04-22 | 2021-06-22 | 汉中祥润和电力科技有限公司 | Two-way hydraulic pressing tool for replacing insulator |
| CN214409329U (en) * | 2021-03-22 | 2021-10-15 | 中天合创能源有限责任公司 | Quick dismounting machine tool for microseismic monitoring sensor |
-
2022
- 2022-09-29 CN CN202211203150.3A patent/CN115383651A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006071511A (en) * | 2004-09-02 | 2006-03-16 | Hokkaido Technology Licence Office Co Ltd | Test piece holding structure for material testing machine |
| CN103884600A (en) * | 2012-12-20 | 2014-06-25 | 核工业西南物理研究院 | Large low-temperature fatigue experimental device for bolt |
| CN103712851A (en) * | 2013-12-20 | 2014-04-09 | 浙江大学 | High-pressure hydrogen environment fatigue test clamp for material testing machine |
| CN206192764U (en) * | 2016-10-20 | 2017-05-24 | 上海凯尔孚应力腐蚀试验设备有限公司 | Simple and easy zero passage fatigue test anchor clamps and system thereof |
| CN207616450U (en) * | 2017-12-25 | 2018-07-17 | 中国石油化工股份有限公司 | A kind of sucker rod fatigue test special fixture |
| CN212228570U (en) * | 2020-05-28 | 2020-12-25 | 济南友金机械设备有限公司 | Threaded type testing machine chuck |
| CN111595695A (en) * | 2020-06-04 | 2020-08-28 | 上海交通大学 | Clearance elimination device and method suitable for low-temperature tension-compression fatigue test |
| CN214409329U (en) * | 2021-03-22 | 2021-10-15 | 中天合创能源有限责任公司 | Quick dismounting machine tool for microseismic monitoring sensor |
| CN113001452A (en) * | 2021-04-22 | 2021-06-22 | 汉中祥润和电力科技有限公司 | Two-way hydraulic pressing tool for replacing insulator |
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