CN218584537U - Mechanical property testing machine for fasteners - Google Patents
Mechanical property testing machine for fasteners Download PDFInfo
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- CN218584537U CN218584537U CN202222726271.8U CN202222726271U CN218584537U CN 218584537 U CN218584537 U CN 218584537U CN 202222726271 U CN202222726271 U CN 202222726271U CN 218584537 U CN218584537 U CN 218584537U
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- air outlet
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Abstract
The utility model relates to a fastener mechanical properties testing machine belongs to and detects technical field. The tensile testing machine body is provided with a buffer device, the buffer device comprises a shell fixedly arranged on the stand column and a piston arranged in the shell in a sliding manner, the shell is provided with a sliding cavity with an opening facing to the lower clamp, and the closed end of the top is provided with an air outlet and a through hole for the connecting rod to pass through; the piston is annular, the inner ring of the piston is fixedly sleeved on the upper clamp, the outer ring of the piston is in sliding connection with the inner wall of the sliding cavity, the outer diameter of the outer ring of the piston corresponds to the inner diameter of the sliding cavity, the sliding cavity is divided into an upper part and a lower part by the piston, the upper part is communicated with the atmosphere through an air outlet, the lower part is directly communicated with the atmosphere, and the cross-sectional area of the air outlet is smaller than that of the sliding cavity. And a buffer device is used for buffering the huge impact force formed on a hydraulic cylinder piston rod of the tensile testing machine at the moment of fracture of the fastener to be tested.
Description
Technical Field
The utility model relates to a detect technical field, specific fastener mechanical properties testing machine that says so.
Background
The fastener is widely applied to various connection occasions, and the mechanical property of the fastener is detected by carrying out fatigue tensile test on the fastener according to the current national standard GJB715.30A-2002 tensile fatigue of fastener test method.
Usually, a tensile testing machine is used for detecting the tensile property of a fastener, the fastener to be detected is fixed in an upper tool and a lower tool of the tensile testing machine, a pair of external forces with equal and opposite directions are applied to two ends of the fastener to be detected, the fastener to be detected is elongated and deformed under the action of the external forces, and the external forces gradually increase until the fastener to be detected is broken, so that various mechanical properties of the fastener to be detected, such as the maximum axial deformation and the like, are obtained.
The fastener to be detected is subjected to a large bidirectional acting force at the moment of fracture of the fastener, the fastener to be detected is fractured into an upper part and a lower part, the upward tension of the lower fastener to be detected disappears instantly, so that the lower fastener to be detected impacts the base under the action of reverse tension, the base is generally a metal piece, the impact resistance is good, and the continuous usability of the base is not influenced; the downward tensile force of the upper fastener to be tested disappears instantly, the upper fastener to be tested acts on the power output end of the tensile testing machine rapidly under the action of the upward tensile force, large impact is formed on the power output end of the tensile testing machine, the power output is usually driven by a hydraulic cylinder, the piston rod is impacted by the impact, the piston rod is deformed to a certain degree, after multiple times of tensile loading, the hydraulic cylinder leaks oil, the power output end of the tensile testing machine cannot be loaded according to the preset load, and the service life of the tensile testing machine is shortened.
SUMMERY OF THE UTILITY MODEL
In order to reduce the fastener fracture that awaits measuring and form huge impact to tensile testing machine's pneumatic cylinder piston rod in the twinkling of an eye and make the piston rod take place certain deformation, prevent tensile loading back many times, lead to the pneumatic cylinder oil leak, the utility model provides a fastener mechanical properties testing machine.
The utility model discloses a concrete scheme do: a mechanical property testing machine for fasteners comprises a workbench, wherein a lower clamp and an upright post are arranged on the workbench, a cross beam parallel to the workbench penetrates through the upright post, a loading hydraulic cylinder penetrates through the cross beam, the loading hydraulic cylinder is connected with an upper clamp opposite to the lower clamp through a connecting rod, a buffer device is sleeved on the connecting rod and comprises a shell fixedly mounted on the upright post and a piston arranged in the shell in a sliding manner, the shell is provided with a sliding cavity with an opening facing to the lower clamp, and a closed end at the top is provided with an air outlet and a through hole for the connecting rod to pass through; the piston is annular, the inner ring of the piston is fixedly sleeved on the upper clamp, the outer ring of the piston is in sliding connection with the inner wall of the sliding cavity, the outer diameter of the outer ring of the piston corresponds to the inner diameter of the sliding cavity, the sliding cavity is divided into an upper part and a lower part by the piston, the upper part is communicated with the atmosphere through an air outlet, the lower part is directly communicated with the atmosphere, and the cross-sectional area of the air outlet is smaller than that of the sliding cavity.
As an optimization scheme of the mechanical property testing machine for the fasteners, the ratio of the cross-sectional area of the air outlet to the cross-sectional area of the sliding cavity is 1.
As an optimization scheme of the mechanical property testing machine for the fastener, the ratio of the cross-sectional area of the air outlet to the cross-sectional area of the sliding cavity is 1.
As another optimization scheme of the mechanical property testing machine for the fasteners, a metal filter screen is arranged on the air outlet.
As another optimization scheme of the mechanical property testing machine for the fasteners, the shell is a cube with a cylindrical sliding cavity, and the cube is further provided with mounting holes matched with the stand columns.
As another optimization scheme of the mechanical property testing machine for the fasteners, the mounting holes are columnar through holes, and the inner diameter of each mounting hole is smaller than the outer diameter of each upright post.
As another optimization scheme of the mechanical property testing machine for the fasteners, a supporting hydraulic cylinder is arranged between the cross beam and the workbench, and the output end of the supporting hydraulic cylinder is fixedly connected with the cross beam.
As another optimization scheme of the mechanical property testing machine for the fasteners, a flange convenient for being in threaded connection with the bottom surface of the cross beam is arranged at the output end of the supporting hydraulic cylinder.
Advantageous effects
A fastener mechanical properties testing machine, in the twinkling of an eye at the fastener fracture, the fracture of test fastener is upper and lower two parts, and the upper portion through buffer fracture test fastener removes to tensile testing machine's power take off end fast. Because the fracture is in the twinkling of an eye, great effort that makes progress drives the piston and removes to sliding chamber upper portion, because the sectional area of gas outlet is less than the cross sectional area of sliding chamber, upper portion sliding chamber is linked together through gas outlet and atmosphere, lower part sliding chamber is direct to be linked together with the atmosphere, the gas outlet is used for the exhaust this moment, the lower part sliding chamber that directly links together with the atmosphere is the air inlet, the speed that leads to giving vent to anger is less than the speed of admitting air, lead to the gas in the sliding chamber to be compressed, the reaction is on piston and last anchor clamps, make its upward movement obstructed, prevent piston and the piston rod of the quick upward movement of last anchor clamps and impact tensile testing machine's pneumatic cylinder.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic view of the housing;
in the drawings: 1. the device comprises a tensile testing machine body, 101, a workbench, 102, an upright post, 103, a cross beam, 2, a clamping tool, 201, an upper clamp, 202, a lower clamp, 3, a hydraulic cylinder, 4, a connecting rod, 5, a buffer device, 501, a shell, 5011, a sliding cavity, 502, a piston, 503, an air outlet, 504, a through hole, 505, a mounting hole, 6, a filter screen, 7, a supporting hydraulic cylinder, 8 and a locking mechanism.
Detailed Description
As shown in fig. 1, as described in the prior art mentioned in the background art, the existing mechanical property testing machine includes a tensile testing machine body 1 and a clamping tool 2 located on the tensile testing machine body 1, the tensile testing machine body 1 includes a workbench 101, four upright posts 102 are fixedly arranged on the workbench 101, a cross beam 103 parallel to the workbench 101 penetrates through the upper parts of the four upright posts 102, and a loading hydraulic cylinder 3 penetrates through the cross beam 103; the clamping tool 2 comprises an upper clamp 201 and a lower clamp 202, the upper clamp 201 is connected to a piston rod of the loading hydraulic cylinder 3 through a connecting rod 4, the lower clamp 202 is installed on the workbench 101, and the upper clamp 201 and the lower clamp 202 are arranged oppositely.
Different from the prior art, as shown in fig. 1, the mechanical property testing machine for the fastener described in this embodiment includes a buffering device 5 sleeved on a connecting rod 4, where the buffering device 5 is used to buffer the moment when the fastener is broken, the broken fastener and an upper clamp 201 form a huge impact force on a piston rod of a loading hydraulic cylinder 3, the buffering device 5 includes a housing 501 and a piston 502 slidably disposed in the housing 501, the housing 501 has a sliding cavity 5011 with a downward opening, a through hole 504 for the connecting rod 4 to pass through is formed at the top of the sliding cavity 5011, and the outer wall of the housing 501 is fixedly mounted on a column 102; piston 502 is annular, the inner ring of piston 502 is fixedly sleeved on upper clamp 201, the outer ring of piston 502 is connected with the inner wall of sliding cavity 5011 in a sliding manner, the outer diameter of the outer ring of piston 502 is the same as that of sliding cavity 5011, sliding cavity 5011 is divided into an upper part and a lower part by piston 502, the upper part is communicated with the atmosphere through air outlet 503, the lower part is directly communicated with the atmosphere, and the sectional area of air outlet 503 is smaller than the area of the end face of sliding cavity 5011.
In the normal stretching process, the fastener to be tested and the piston 502 move upwards under the action of the hydraulic cylinder 3, and because the piston 502 moves upwards slowly in the normal stretching process, the gas in the sliding cavity 5011 can be exhausted from the sliding cavity 5011, and the normal operation of a stretching test is not influenced. When the fastener to be tested breaks, the downward pulling force of the fastener to be tested disappears, the broken upper fastener has a larger upward acting force and has a tendency of driving the piston 502 and the upper clamp 201 to upwards impact the piston rod of the hydraulic cylinder 3, and in the process that the upper fastener to be tested drives the piston 502 to upwards move, because the sectional area of the air outlet 503 is smaller than the cross sectional area of the sliding cavity 5011 and the upper clamp 201 and the sliding cavity 5011 are not communicated, the gas in the sliding cavity 5011 cannot be rapidly discharged from the air outlet 503, at the moment, the upper clamp 201 and the piston 502 compress the gas in the sliding cavity 5011, the compressed gas reacts on the upper clamp 201 and the piston 502 in the sliding cavity 5011, and the upper fastener is prevented from driving the piston 502 to upwards and rapidly move, and further the piston rod of the hydraulic cylinder 3 is prevented from being impacted.
In order to absorb a large upward force quickly in a buffering manner, the ratio of the area of the air outlet 503 to the area of the sliding cavity 5011 is 1 to 10-30, and 1.
As shown in FIG. 1, in order to prevent the particulate impurities in the air from entering into the sliding cavity 5011 and further wear the outer ring of the piston 502 and the inner wall of the sliding cavity 5011, when the piston 502 is forced upward, air leaks between the outer ring of the piston 502 and the inner wall of the sliding cavity 5011, and the buffering effect is affected, a metal filter screen 6 is disposed on the air outlet 503 to prevent the particulate impurities in the air from entering into the sliding cavity 5011.
As shown in fig. 2, in order to facilitate the housing 501 to be fixedly mounted on the upright post 102, the housing 501 is a cube having a cylindrical sliding cavity 5011, a mounting hole 505 matched with the upright post 102 is further formed in the cube, the mounting hole 505 is a cylindrical through hole, and the inner diameter of the mounting hole 505 is smaller than the outer diameter of the upright post 102, so that the housing 501 is fixedly mounted on the upright post 102 in an interference fit manner.
When fasteners with different lengths are loaded, the distance between the cross beam 103 and the workbench 101 needs to be adjusted, the supporting hydraulic cylinder 7 is arranged between the cross beam 103 and the workbench 101, the output end of the supporting hydraulic cylinder 7 is fixedly connected with the cross beam 103, and in order to facilitate the connection and fixation of the supporting hydraulic cylinder 7 and the cross beam 103, a flange plate which is conveniently in threaded connection with the bottom surface of the cross beam 103 is arranged on the output end of the supporting hydraulic cylinder 7 and used for adjusting the distance between the cross beam 103 and the workbench 101. When the cross beam 103 is adjusted to a required position, the cross beam 103 is fixedly mounted on the upright post 102 by the locking mechanism 8, wherein the locking mechanism 8 is a conventional structure and is not described in detail.
Claims (8)
1. The utility model provides a fastener mechanical properties testing machine, includes workstation (101), is provided with down anchor clamps (202) and stand (102) on workstation (101), wears to be equipped with crossbeam (103) that are on a parallel with workstation (101) on stand (102), wears to be equipped with loading pneumatic cylinder (3) on crossbeam (103), and loading pneumatic cylinder (3) are connected with through connecting rod (4) and anchor clamps (202) relative last anchor clamps (201) down, its characterized in that:
the connecting rod (4) is sleeved with a buffer device (5), the buffer device (5) comprises a shell (501) fixedly mounted on the upright post (102) and a piston (502) arranged in the shell (501) in a sliding mode, the shell (501) is provided with a sliding cavity (5011) with an opening facing downwards to the clamp (202), and the closed end of the top of the shell is provided with an air outlet (503) and a through hole (504) for the connecting rod (4) to pass through; the piston (502) is annular, the inner ring of the piston (502) is fixedly sleeved on the upper clamp (201), the outer ring of the piston (502) is in sliding connection with the inner wall of the sliding cavity (5011), the outer diameter of the outer ring of the piston (502) corresponds to the inner diameter of the sliding cavity (5011), the sliding cavity (5011) is divided into an upper part and a lower part by the piston (502), the upper part is communicated with the atmosphere through an air outlet (503), the lower part is directly communicated with the atmosphere, and the cross-sectional area of the air outlet (503) is smaller than that of the sliding cavity (5011).
2. The mechanical property testing machine for the fasteners as claimed in claim 1, characterized in that: the ratio of the cross-sectional area of the air outlet (503) to the cross-sectional area of the sliding cavity (5011) is 1.
3. The mechanical property testing machine for the fasteners as claimed in claim 2, characterized in that: the ratio of the cross-sectional area of the air outlet (503) to the cross-sectional area of the sliding cavity (5011) is 1.
4. The mechanical property testing machine for the fasteners as claimed in claim 1, is characterized in that: a metal filter screen (6) is arranged on the air outlet (503).
5. The mechanical property testing machine for the fasteners as claimed in claim 1, characterized in that: the shell (501) is a cube with a cylindrical sliding cavity (5011), and a mounting hole (505) matched with the upright post (102) is formed in the cube.
6. The mechanical property testing machine for the fasteners as claimed in claim 5, wherein: the mounting hole (505) is a columnar through hole, and the inner diameter of the mounting hole (505) is smaller than the outer diameter of the upright post (102).
7. The mechanical property testing machine for the fasteners as claimed in claim 1, characterized in that: a supporting hydraulic cylinder (7) is arranged between the cross beam (103) and the workbench (101), and the output end of the supporting hydraulic cylinder (7) is fixedly connected with the cross beam (103).
8. The mechanical property testing machine for the fasteners as claimed in claim 7, wherein: the output end of the supporting hydraulic cylinder (7) is provided with a flange which is convenient to be connected with the bottom surface of the beam (103) by screw threads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222726271.8U CN218584537U (en) | 2022-10-17 | 2022-10-17 | Mechanical property testing machine for fasteners |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222726271.8U CN218584537U (en) | 2022-10-17 | 2022-10-17 | Mechanical property testing machine for fasteners |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218584537U true CN218584537U (en) | 2023-03-07 |
Family
ID=85374894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222726271.8U Active CN218584537U (en) | 2022-10-17 | 2022-10-17 | Mechanical property testing machine for fasteners |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218584537U (en) |
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2022
- 2022-10-17 CN CN202222726271.8U patent/CN218584537U/en active Active
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