CN112082745B - Multi-axis variable frequency fatigue test device suitable for manifold type pipe fitting - Google Patents
Multi-axis variable frequency fatigue test device suitable for manifold type pipe fitting Download PDFInfo
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- CN112082745B CN112082745B CN202010886754.7A CN202010886754A CN112082745B CN 112082745 B CN112082745 B CN 112082745B CN 202010886754 A CN202010886754 A CN 202010886754A CN 112082745 B CN112082745 B CN 112082745B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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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
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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
- G01N3/38—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by electromagnetic means
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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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Abstract
The invention discloses a multi-axis variable frequency fatigue testing device suitable for manifold pipes, relates to the technical field of multi-axis fatigue testing machines, and solves the technical problems of high motor power requirement, complex frequency modulation and low accuracy of the existing fatigue testing machine. The multi-axis variable frequency fatigue test device suitable for the manifold type pipe fitting mainly comprises a piston rod (1), a connecting block (2), a connecting rod (3), a connecting rod (5), a rack (11), a guide pillar (12), a large connecting rod (14) and a T-shaped sliding block (18). The frequency modulation method is suitable for multi-axis frequency conversion fatigue tests of the manifold pipe fitting, frequency modulation is convenient and fast, the power requirement of the motor is reduced, the test efficiency and accuracy are effectively improved, and the actual situation that the manifold pipe fitting bears multi-axis stress is simulated more accurately.
Description
Technical Field
The invention relates to the technical field of multi-axis fatigue testing machines, in particular to a multi-axis variable frequency fatigue testing device suitable for a manifold type pipe fitting.
Background
Manifold pipe fittings are widely used in the machinery industry, such as manifold pipes in high-pressure manifolds in petroleum machinery, intake manifolds of automobile engines, and the like. Manifold type pipe fittings are subject to cyclic loads, particularly multi-axial random loads, during use resulting in fatigue failure due to the erosive effects of the fluid therein and the vibrations transmitted by the equipment in the same system. According to data statistics, the main cause of the fracture accident is fatigue failure caused by fatigue cracks, which can account for 70% -80% of the total number of accidents, and about 90% of cases in mechanical structure failure are fatigue failure.
In the uniaxial fatigue test loading direction, a complete fatigue life assessment method has been formed, and the design is developed on the assumption of uniaxial mechanical properties of the component. In real life, however, the vast majority of fatigue failure events, including fatigue failure of the manifold, are caused by multi-axis random loading. And because the mechanical member has certain differences with the material test piece in the aspects of geometric size and shape, processing quality, surface strengthening process and the like, the fatigue limit of the member is often smaller than that of the material test piece, for example, the fatigue strength is reduced along with the increase of the absolute size of the member, and the fatigue strength of the grinding member is higher. The multi-axial fatigue research on the structural member is an essential link in the design process.
In the existing fatigue testing device, as in patent 201310480430.3, the bending multi-axis fatigue loading of a test piece is realized, but the loading can be carried out only at a fixed position of the test piece. The electromagnetic fatigue testing machine of patent 201510379770.6 has improved experimental efficiency, only is applicable to the less condition of load. The multi-axis fatigue testing machine in patent 201410355547.3 adopts the mode of changing different coefficient of stiffness springs to adjust the load, and the adjustment formula is more loaded down with trivial details.
Disclosure of Invention
The invention mainly aims to provide a multi-axis variable frequency fatigue testing device suitable for manifold pipes, and solves the technical problems of high motor power requirement, complex frequency modulation and low accuracy of the conventional fatigue testing machine. The technical effects that can be produced by the preferred technical scheme of the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a multi-axis variable frequency fatigue test device suitable for a manifold pipe fitting, which comprises a piston rod, a connecting block, a connecting rod, a rack, a guide pillar, a large connecting rod, a T-shaped sliding block, a transmission shaft, a first bearing, a bearing frame, a first movable block, a second movable block, a first fixed block and a second fixed block, wherein the first movable block, the second movable block, the first fixed block and the second fixed block are fixed on the rack through bolts and used for fixing a test piece, and the first movable block, the second movable block, the first fixed block and the second fixed block are respectively fixed on the rack through bolts:
the piston rod is fixed with the connecting block through threads, the connecting block is hinged with a hinge rod, one end of the side link is hinged with the hinge rod, the other end of the side link is fixed on the fixed wall, one end of the connecting rod is hinged with the hinge rod, and the other end of the connecting rod is hinged with the first movable block;
one end of the transmission shaft is connected with a transmission system for driving the transmission shaft to rotate, the other end of the transmission shaft is fixed with an eccentric wheel, the first bearing is arranged on a bearing frame, the bearing frame is arranged on a large connecting rod, a protruding shaft on the eccentric wheel is arranged in the first bearing through a sleeve, the large connecting rod is connected with a T-shaped sliding block through a second bearing and a connecting shaft, and the T-shaped sliding block is arranged on a guide pillar in the frame;
the rack table top is also provided with a square hole which can enable the T-shaped sliding block to move upwards to pass through the rack.
Preferably, the test piece is fixed through dovetail grooves in the first movable block, the second movable block, the first fixed block and the second fixed block.
Preferably, the first movable block and the second movable block as well as the first fixed block and the second fixed block are matched and fixed through a T-shaped groove and a T-shaped block.
Preferably, the transmission system comprises a variable frequency motor and a speed reducer connected with the variable frequency motor through a rotating shaft.
Preferably, be equipped with a plurality of bolt holes that can fix and fix a position between two and fixed block one and fixed block two of movable block one and movable block on the frame, conveniently carry out radial loading to each position of test piece.
Preferably, T-shaped grooves with the same length as the test piece are machined at the left end of the square hole on the surface of the rack at a proper distance, and the two T-shaped grooves are symmetrically arranged on two sides of the center line of the surface of the rack.
Based on the technical scheme, the following technical effects can be generated:
the multi-axis variable frequency fatigue test device suitable for the manifold pipe fitting is suitable for multi-axis variable frequency fatigue test of the manifold pipe fitting. According to the multi-axis variable frequency fatigue testing device suitable for the manifold type pipe fitting, the movable block and the fixed block for fixing the test piece can move by arranging the threaded holes on the rack, so that different positions of the test piece can bear radial loading, the force increasing effect is realized by utilizing a six-rod mechanism and an angle effect, the power requirement of a motor is reduced, the loading frequency is adjusted by utilizing a crank-slider mechanism, and the technical problems of high motor power requirement, complex frequency modulation and low accuracy of the conventional fatigue testing machine are solved. The multi-axis frequency conversion fatigue test device suitable for the manifold pipe fitting is convenient and fast in frequency modulation, reduces the power requirement of a motor, effectively improves the experimental efficiency and accuracy, and more accurately simulates the actual situation that the manifold pipe fitting bears multi-axis stress.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the structure of the present invention;
FIG. 2 is a schematic cross-sectional view of the structure A-A of the present invention;
FIG. 3 is a schematic cross-sectional view of structure B-B of the present invention;
FIG. 4 is a schematic view of the radial loading mechanism of the present invention;
in the figure: 1. the device comprises a piston rod, 2 degrees of connecting blocks, 3 degrees of connecting rods, 4 degrees of hinge rods, 5 degrees of connecting rods, 6 degrees of movable blocks I, 7 degrees of movable blocks II, 8 degrees of test pieces, 9 degrees of fixed blocks I, 10 degrees of fixed blocks II, 11 degrees of machine frames, 12 degrees of guide columns, 13 degrees of eccentric wheels, 14 degrees of large connecting rods, 15 degrees of hexagon bolts, 16 degrees of large connecting rod through holes, 17 degrees of expansion sleeves I, 18 degrees of T-shaped sliding blocks, 19 degrees of transmission shafts, 20 degrees of bearing end covers, 21 degrees of expansion sleeves II, 22 degrees of sleeves, 23 degrees of bearing I, 24 degrees of protruding shafts, 25 degrees of bearing frames, 26 degrees of connecting shafts, 27 degrees of bearing II, 28 degrees of speed reducers, 29 degrees of variable frequency motors and 30 degrees of T-shaped groove bolts.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention will be further described with reference to the accompanying drawings, but the scope of protection of the invention is not limited to the following.
As shown in fig. 1-4:
the invention provides a multi-axis variable frequency fatigue test device suitable for manifold pipes, which comprises a piston rod 1, a connecting block 2, a connecting rod 3, a connecting rod 5, a rack 11, a guide pillar 12, a large connecting rod 14, a T-shaped sliding block 18, a transmission shaft 19, a first bearing 23, a bearing bracket 25, a first movable block 6, a second movable block 7, a first fixed block 9 and a second fixed block 10, wherein the first movable block 6, the second movable block 7, the first fixed block 9 and the second fixed block 10 are fixed on the rack 11 through bolts and are used for fixing a test piece 8, and the multi-axis variable frequency fatigue test device comprises:
the piston rod 1 is fixed with the connecting block 2 through threads, the connecting block 2 is hinged with a hinge rod 4, one end of the side link 3 is hinged with the hinge rod 4, the other end of the side link is fixed on the fixed wall, one end of the connecting rod 5 is hinged with the hinge rod 4, and the other end of the connecting rod is hinged with the first movable block 6;
one end of the transmission shaft 19 is connected with a transmission system for driving the transmission shaft 19 to rotate, the other end of the transmission shaft is fixed with an eccentric wheel 13, a bearing I23 is arranged on a bearing frame 25, the bearing frame 25 is arranged on a large connecting rod 14, a protruding shaft 24 on the eccentric wheel 13 is arranged in the bearing I23 through a sleeve 22, the large connecting rod 14 is connected with a T-shaped sliding block 18 through a bearing II 27 and a connecting shaft 26, and the T-shaped sliding block 18 is arranged on a guide post 12 in the frame 11;
the table top of the frame 11 is further provided with a square hole which can allow the T-shaped sliding block 18 to move upwards to pass through the frame 11.
As an alternative embodiment, the test piece 8 is fixed by dovetail grooves on the first movable block 6, the second movable block 7, the first fixed block 9 and the second fixed block 10.
As an optional implementation mode, the first movable block 6 and the second movable block 7 and the first fixed block 9 and the second fixed block 10 are matched and fixed through a T-shaped groove and a T-shaped block.
As an alternative embodiment, the transmission system comprises a variable frequency motor 29 and a speed reducer 28 connected with the variable frequency motor 29 through a rotating shaft.
As an optional implementation mode, the rack 11 is provided with a plurality of bolt holes capable of fixing and positioning the space between the first movable block 6 and the second movable block 7 and the space between the first fixed block 9 and the second fixed block 10, so that radial loading can be conveniently performed on each position of the test piece 8.
As an alternative embodiment, T-shaped grooves with the same length as the test piece 8 are processed at the left end of the square hole on the table top of the rack 11 at a proper distance, and the two T-shaped grooves are symmetrically arranged on two sides of the center line of the table top of the rack 11.
As an alternative embodiment, a hex bolt 15 secures the bearing bracket 25 and the large link 14 together.
Alternatively, a circular hole above the large connecting rod 14 is matched with the outer diameter of the bearing 27, and the inner diameter of the bearing 27 is matched with the connecting shaft 26.
As an alternative embodiment, the two end extending portions of the first fixing block 9 and the second fixing block 10 after being fixed in a matching manner are fixed on the rack 11 by using T-shaped groove bolts 30.
In an optional embodiment, a bearing end cover 20 is further disposed between the transmission shaft 19 and the frame 11.
As an alternative embodiment, the eccentric 13 is fixed to the drive shaft 19 by means of an expansion sleeve 21.
The working principle of the multi-axis variable frequency fatigue test device suitable for the manifold type pipe fitting is as follows: the two ends of the test piece 8 are in a circular truncated cone shape, dovetail groove structures in the middle of the first movable block 6 and the second movable block 7 are symmetrical to each other and can be matched with each other to fix the test piece 8, the first movable block 6 is matched and fixed with a T-shaped groove in the second movable block 7 through a T-shaped block on the upper portion, and the left end fixing portion is the same. The first left end fixing block 9 and the second left end fixing block 10 can be axially adjusted in position along the test piece 8 and fixed on a T-shaped groove in the left end table surface of the rack 11 through a T-shaped groove bolt 30, and therefore the test piece can be fixed in different positions. In the radial loading structure, the motor 29 drives the transmission shaft 19 to rotate, the transmission shaft 19 transmits power to the large connecting rod 14 through the eccentric wheel 13 and the sleeve 22, the large connecting rod 14 enables the T-shaped sliding block 18 to move up and down along the radial direction of the test piece 8, the radial loading of the test piece 8 is completed, and the reciprocating speed of the T-shaped sliding block 18 can be adjusted by adjusting the frequency of the motor 29. A thread is processed on a piston rod 1 of the hydraulic cylinder, the piston rod 1 is fixed with a connecting block 2 through the thread, the piston rod 1 moves leftwards, a pressure angle alpha of a hinge rod 4 is reduced, force amplification is carried out, one end of a connecting rod 5 is hinged with the hinge rod 4, the other end of the connecting rod is hinged with a first movable block 6, and the amplified force is applied to the first movable block 6.
Claims (6)
1. The utility model provides a multiaxis frequency conversion fatigue test device suitable for qi type pipe fitting, includes piston rod (1), connecting block (2), side link (3), connecting rod (5), frame (11), guide pillar (12), big connecting rod (14), T type slider (18), transmission shaft (19), bearing (23), bearing bracket (25), fix movable block (6) that are used for fixed test piece (8) on frame (11) through the bolt, movable block two (7), fixed block (9) and fixed block two (10), its characterized in that:
the piston rod (1) is fixed with the connecting block (2) through threads, the connecting block (2) is hinged with a hinge rod (4), one end of the side link (3) is hinged with the hinge rod (4), one end of the side link is fixed on the fixed wall, one end of the connecting rod (5) is hinged with the hinge rod (4), and the other end of the connecting rod is hinged and fixed with the first movable block (6);
one end of the transmission shaft (19) is connected with a transmission system for driving the transmission shaft (19) to rotate, the other end of the transmission shaft is fixed with an eccentric wheel (13), a bearing I (23) is installed on a bearing frame (25), the bearing frame (25) is installed on a large connecting rod (14), a protruding shaft (24) on the eccentric wheel (13) is installed in the bearing I (23) through a sleeve (22), the large connecting rod (14) is connected with a T-shaped sliding block (18) through a bearing II (27) and a connecting shaft (26), and the T-shaped sliding block (18) is installed on a guide post (12) in the rack (11);
the table top of the rack (11) is also provided with a square hole which can enable the T-shaped sliding block (18) to move upwards to pass through the rack (11);
the two ends of the test piece (8) are in a circular truncated cone shape, dovetail groove structures in the middle of the first movable block (6) and the second movable block (7) are symmetrical to each other and can be matched with each other to fix the test piece (8), the first movable block (6) is matched and fixed with a T-shaped groove in the second movable block (7) through a T-shaped block on the upper portion, and the left end fixing portion is the same; the left end fixing block I (9) and the fixing block II (10) can be axially adjusted in position along the test piece (8) and are fixed on a T-shaped groove on the left end table surface of the rack (11) through a T-shaped groove bolt (30), and therefore the test piece can be fixed at different positions; in the radial loading structure, a variable frequency motor (29) drives a transmission shaft (19) to rotate, the transmission shaft (19) transmits power to a large connecting rod (14) through an eccentric wheel (13) and a sleeve (22), the large connecting rod (14) enables a T-shaped sliding block (18) to move up and down along the radial direction of a test piece (8), the radial loading of the test piece (8) is completed, and the reciprocating speed of the T-shaped sliding block (18) can be adjusted by adjusting the frequency of the variable frequency motor (29); a thread is processed on a piston rod (1) of a hydraulic cylinder, the piston rod (1) is fixed with a connecting block (2) through the thread, the piston rod (1) moves leftwards, a pressure angle alpha of a hinge rod (4) is reduced, force amplification is carried out, one end of a connecting rod (5) is hinged with the hinge rod (4), the other end of the connecting rod is hinged with a first movable block (6), and the amplified force is applied to the first movable block (6).
2. The multi-axis variable frequency fatigue testing device suitable for manifold type pipes of claim 1, wherein: the test piece (8) is fixed through dovetail grooves on the first movable block (6), the second movable block (7), the first fixed block (9) and the second fixed block (10).
3. The multi-axis variable frequency fatigue testing device suitable for manifold type pipes of claim 1, wherein: and the movable block I (6) and the movable block II (7) and the fixed block I (9) and the fixed block II (10) are matched and fixed through a T-shaped groove and a T-shaped block.
4. The multi-axis variable frequency fatigue testing device suitable for manifold type pipes of claim 1, wherein: the transmission system comprises a variable frequency motor (29) and a speed reducer (28) connected with the variable frequency motor (29) through a rotating shaft.
5. The multi-axis variable frequency fatigue testing device suitable for manifold pipes as claimed in claim 1, wherein: be equipped with a plurality of bolt holes that can fix and fix a position between movable block one (6) and movable block two (7) and fixed block one (9) and fixed block two (10) on frame (11), conveniently carry out radial loading to each position of test piece (8).
6. The multi-axis variable frequency fatigue testing device suitable for manifold type pipes of claim 1, wherein: t-shaped grooves with the same length as the test piece (8) are processed at the left end of the square hole on the table top of the rack (11) at proper distance, and the number of the T-shaped grooves is two, and the T-shaped grooves are symmetrically arranged on two sides of the center line of the table top of the rack (11).
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| CN115856747B (en) * | 2022-12-01 | 2024-12-24 | 中国船舶科学研究中心 | Ship dynamic shaft torque simulation device and simulation and design method |
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| CN104990820A (en) * | 2015-07-01 | 2015-10-21 | 河海大学 | Electromagnetic multiaxial fatigue testing machine |
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