CN115575231A - Coaxial adjusting mechanism for dynamic fatigue testing machine - Google Patents
Coaxial adjusting mechanism for dynamic fatigue testing machine Download PDFInfo
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- CN115575231A CN115575231A CN202211121049.3A CN202211121049A CN115575231A CN 115575231 A CN115575231 A CN 115575231A CN 202211121049 A CN202211121049 A CN 202211121049A CN 115575231 A CN115575231 A CN 115575231A
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- hole
- seat
- load sensor
- pull rod
- adjusting
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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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
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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
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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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
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- 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 discloses a coaxial adjusting mechanism for a dynamic fatigue testing machine, wherein the top end of a load sensor seat is designed into a spherical surface after improvement, and a spherical adjusting seat is additionally arranged between the load sensor seat and a movable beam. The ball head load sensor seat and the adjusting seat form pre-tightening spherical fit through the pull rod and the pull rod locking nut, and the relative positions of the load sensor seat and the adjusting seat can be slightly changed by adjusting the adjusting screws arranged on the periphery of the adjusting seat, so that the coaxiality of the central axis of the sensor relative to the axis of the actuator is adjusted. Meanwhile, the device is simple in structure, convenient to install and good in using effect.
Description
Technical Field
The invention relates to a coaxial adjusting mechanism, in particular to a coaxial adjusting mechanism for a dynamic fatigue testing machine.
Background
The submarine pipeline fatigue is a process that a pipeline gradually generates local permanent accumulated damage at one or more positions under the action of cyclic stress or cyclic strain, and cracks or complete fracture suddenly occur after a certain number of cycles. Because the in-service submarine pipeline is in a severe environment, the pipeline can vibrate under the combined action of external forces such as waves, ocean currents and the like, and finally the probability of fatigue failure of the pipeline is high. Therefore, in order to ensure the reliability of the submarine pipeline in service and establish the fatigue failure analysis capability, the fatigue test is completed by combining theoretical calculation and submarine pipeline stress analysis to research the fatigue failure resistance capability of submarine pipeline materials, and the method has important significance for preventing pipeline fatigue failure.
The dynamic fatigue testing machine is used for testing indexes such as fatigue limit and fatigue life by subjecting a sample or a member to stress or strain which changes periodically or randomly, and the specific structure is referred to a fatigue testing machine in chapter 11 of the material testing machine published by the Chinese measurement publishing company. The coaxial guiding mechanism who has now to be used for dynamic fatigue testing machine includes: the pull rod type load sensor comprises a pull rod lock nut 1, a pull rod 2, a movable cross beam 3, a load sensor seat 6 and a load sensor 7. Traditional mounting means does not have the sphere and adjusts the seat, and the upper end structure is also not the bulb structure, and installation back sensor seat and crossbeam fastening cooperation are unadjustable, lead to fatigue testing machine inner mechanism actuator connection sensor's axiality to guarantee only through part machining precision and later stage equipment fixing precision.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a coaxial adjusting mechanism for a dynamic fatigue testing machine, which ensures that an actuator and a sensor are coaxial in the testing process and improves the accuracy and the reliability of the testing result.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention discloses a coaxial adjusting mechanism for a dynamic fatigue testing machine, which comprises a movable beam and a load sensor seat, wherein the movable beam is connected above a screw rod of the dynamic fatigue testing machine, a load sensor is fixed on the bottom wall of the load sensor seat, a pull rod is arranged in a central hole of the movable beam, the upper end and the lower end of the pull rod are respectively provided with an upper threaded end and a lower threaded end, the upper threaded end of the pull rod is in threaded connection with a pull rod lock nut and is fastened on the top wall of the movable beam, and the coaxial adjusting mechanism is characterized in that:
the center hole is of a convex structure, a diameter large end at the lower part of the center hole forms a positioning hole, one adjusting seat 4 comprises a seat body, a shaft shoulder is arranged on the outer wall of the upper part of the seat body, a first center through hole is formed in the middle of the seat body along the vertical direction, the first center through hole consists of a seat body connecting hole at the middle upper part and a mounting hole at the middle lower part, the top surface of the seat body mounting hole is a spherical surface, locking threaded holes are formed in the left side wall and the right side wall of the seat body along the horizontal direction respectively, and the locking threaded holes are communicated with the mounting holes;
the utility model discloses a load sensor seat, including load sensor seat, adjusting seat, pull rod, bearing, adjusting seat, the upper portion of load sensor seat coincide and insert the mounting hole setting with the mounting hole shape of adjusting seat, the diapire card of adjusting seat with the location on the outer wall of load sensor seat the centre of load sensor seat open second central through-hole, second central through-hole well upper portion be sensor connecting hole and well lower part for connecting threaded hole, the lower part of pull rod pass first central through-hole and the sensor connecting hole of adjusting seat and load sensor in proper order and through lower thread end and load sensor's connecting threaded connection, pull rod and pedestal connecting hole and sensor connecting hole clearance fit, the adjusting seat compress tightly through the shaft shoulder and set up on the diapire of crossbeam and be located the pedestal on shaft shoulder upper portion and insert the locating hole setting, load sensor seat press from both sides tightly through the adjusting screw that passes on the locking threaded hole and fix in the mounting hole.
The beneficial effects of the invention are:
the top surface of the load sensor base is designed into a spherical surface, and a spherical surface adjusting base is additionally arranged between the load sensor base and the movable beam. The spherical adjusting seat is precisely matched with the movable cross beam, the load sensor seat and the spherical adjusting seat form pre-tightening spherical matching through the pull rod and the pull rod locking nut, and finally the relative positions of the ball load sensor seat and the spherical adjusting seat can be slightly changed through adjusting the adjusting screws arranged on the periphery of the spherical adjusting seat, so that the coaxiality adjustment of the central axis of the sensor relative to the axis of the actuator is completed. The actuator and the sensor in the fatigue testing machine are coaxial in the testing process, and the accuracy of the testing result is improved.
Drawings
FIG. 1 is a front view of the coaxial adjustment mechanism for the dynamic fatigue testing machine of the present invention;
FIG. 2 is a cross-sectional view of an adjustment block in the apparatus shown in FIG. 1;
FIG. 3 is a cross-sectional view of a load cell mount in the apparatus shown in FIG. 1;
FIG. 4 is a schematic view of the structure of a pull rod in the device shown in FIG. 1;
fig. 5 is a schematic structural view of a draw bar lock nut in the device shown in fig. 1.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
The attached drawing shows a coaxial adjusting mechanism for a dynamic fatigue testing machine, which comprises a movable cross beam 3 and a load sensor seat 6, wherein the movable cross beam 3 and the load sensor seat 6 are connected above a lead screw of the dynamic fatigue testing machine, a load sensor 7 is fixed on the bottom wall of the load sensor seat 6, a pull rod 2 is placed in a central hole of the movable cross beam, the upper end and the lower end of the pull rod are respectively provided with an upper threaded end and a lower threaded end, and the upper threaded end of the pull rod is in threaded connection with a pull rod lock nut 1 and is fastened on the top wall of the movable cross beam 3.
The center hole is of a convex structure, a diameter large end at the lower part of the center hole forms a positioning hole, one adjusting seat 4 comprises a seat body, a shaft shoulder is arranged on the outer wall of the upper part of the seat body, a first center through hole is formed in the middle of the seat body along the vertical direction, the first center through hole consists of a seat body connecting hole at the middle upper part and a mounting hole at the middle lower part, the top surface of the seat body mounting hole is a spherical surface, locking threaded holes are formed in the left side wall and the right side wall of the seat body along the horizontal direction respectively, and the locking threaded holes are communicated with the mounting holes.
The upper part of the load sensor seat 6 is matched with the mounting hole of the adjusting seat 4 in shape and is inserted into the mounting hole, the bottom wall of the adjusting seat 4 is clamped on the outer wall of the load sensor seat 6 to be positioned, a second central through hole is formed in the middle of the load sensor seat 6, the middle upper part of the second central through hole is a sensor connecting hole, and the middle lower part of the second central through hole is a connecting threaded hole.
Preferably, the diameter of the sensor connecting hole is larger than that of the connecting threaded hole, a positioning ring table is arranged on the pull rod 2 at the upper part of the lower threaded end, and the bottom wall of the positioning ring table is tightly pressed on the bottom wall of the sensor connecting hole for positioning.
The lower part of pull rod 2 pass the first central through hole of adjustment seat 4 and load sensor 6's sensor connecting hole in proper order and through lower thread end and load sensor 6's connecting thread hole threaded connection, pull rod and pedestal connecting hole and sensor connecting hole clearance fit, adjustment seat 4 compress tightly through the shaft shoulder and set up on the diapire of crossbeam and be located the pedestal on shaft shoulder upper portion and insert the setting of locating hole. The load sensor seat 6 is clamped and fixed in the mounting hole through an adjusting screw 5 penetrating through the locking threaded hole.
The inside sphere that is of adjustment seat 4 mainly plays the aligning effect, assembles load sensor seat 6 and adjustment seat 4 to through the sphere cooperation, utilize pull rod 2 to connect, after the sphere that is inside the adjustment seat 4 and load sensor seat 6 roof closely laminated, utilize adjusting screw 5 to fasten.
The specific assembly process is as follows:
1. the pull rod 2 and the pull rod lock nut 1 are screwed firmly by utilizing the end part of the pull rod 2 to form a whole;
2. the pull rod 2 penetrates through a center hole of the movable cross beam 3, and the pull rod lock nut 1 and the movable cross beam 3 are firmly fixed by using a screw and a spring washer which are prepared in advance;
3. the adjusting seat 4 is sleeved on the pull rod 2 according to the position shown in the figure and is placed in a positioning hole of the movable cross beam 3, and the adjusting screw 5 is adjusted to a proper position in advance;
4. screwing the load sensor seat 6 into the threaded end surface of the pull rod 2, and applying a pre-tightening force with a proper magnitude to the pull rod 2 by rotating the load sensor seat 6;
5. finally, the load sensor 7 and the ball load sensor seat 6 are firmly fixed by using the adjusting screw 5.
Claims (2)
1. The utility model provides a coaxial guiding mechanism for dynamic fatigue testing machine, is including connecting at the moving beam of dynamic fatigue testing machine lead screw top, load sensor seat the diapire of load sensor seat on be fixed with load sensor moving beam's centre bore in placed the pull rod, the upper and lower both ends of pull rod set up respectively to last screw thread end, lower screw thread end, the last screw thread end and the pull rod lock nut threaded connection of pull rod and fastening on moving beam's roof, its characterized in that:
the center hole is of a convex structure, a diameter large end at the lower part of the center hole forms a positioning hole, one adjusting seat 4 comprises a seat body, a shaft shoulder is arranged on the outer wall of the upper part of the seat body, a first center through hole is formed in the middle of the seat body along the vertical direction, the first center through hole consists of a seat body connecting hole at the middle upper part and a mounting hole at the middle lower part, the top surface of the seat body mounting hole is a spherical surface, locking threaded holes are formed in the left side wall and the right side wall of the seat body along the horizontal direction respectively, and the locking threaded holes are communicated with the mounting holes;
the upper portion of the load sensor seat is matched with the mounting hole of the adjusting seat in shape and is inserted into the mounting hole, the bottom wall of the adjusting seat is clamped on the outer wall of the load sensor seat to be positioned, a second central through hole is formed in the middle of the load sensor seat, the middle upper portion of the second central through hole is a sensor connecting hole, the middle lower portion of the second central through hole is a connecting threaded hole, the lower portion of the pull rod sequentially penetrates through the first central through hole of the adjusting seat and the sensor connecting hole of the load sensor and is in threaded connection with the connecting threaded hole of the load sensor through a lower threaded end, the pull rod is in clearance fit with the seat body connecting hole and the sensor connecting hole, the adjusting seat is tightly pressed on the bottom wall of the cross beam through a shaft shoulder and is arranged on the seat body above the shaft shoulder in an inserting positioning hole, and the load sensor seat is tightly fixed in the mounting hole through an adjusting screw penetrating through a locking threaded hole.
2. The coaxial adjustment mechanism for a dynamic fatigue testing machine according to claim 1, characterized in that: the diameter of the sensor connecting hole is larger than that of the connecting threaded hole, a positioning ring table is arranged on the pull rod on the upper portion of the lower threaded end, and the bottom wall of the positioning ring table is tightly pressed on the bottom wall of the sensor connecting hole to be positioned.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211121049.3A CN115575231A (en) | 2022-09-15 | 2022-09-15 | Coaxial adjusting mechanism for dynamic fatigue testing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211121049.3A CN115575231A (en) | 2022-09-15 | 2022-09-15 | Coaxial adjusting mechanism for dynamic fatigue testing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115575231A true CN115575231A (en) | 2023-01-06 |
Family
ID=84581814
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211121049.3A Pending CN115575231A (en) | 2022-09-15 | 2022-09-15 | Coaxial adjusting mechanism for dynamic fatigue testing machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115575231A (en) |
-
2022
- 2022-09-15 CN CN202211121049.3A patent/CN115575231A/en active Pending
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