CN107525722B - Bolt bending fatigue testing tool, testing device and testing method - Google Patents
Bolt bending fatigue testing tool, testing device and testing method Download PDFInfo
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- CN107525722B CN107525722B CN201610448382.3A CN201610448382A CN107525722B CN 107525722 B CN107525722 B CN 107525722B CN 201610448382 A CN201610448382 A CN 201610448382A CN 107525722 B CN107525722 B CN 107525722B
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- 238000012360 testing method Methods 0.000 title claims abstract description 85
- 238000009661 fatigue test Methods 0.000 title claims abstract description 75
- 238000005452 bending Methods 0.000 title claims abstract description 63
- 230000007246 mechanism Effects 0.000 claims abstract description 85
- 238000000034 method Methods 0.000 claims description 6
- 210000000056 organ Anatomy 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
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- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
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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
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending 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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Abstract
The invention provides a bolt bending fatigue testing tool, a testing device and a testing method. The test tool comprises a fixing mechanism, a connecting mechanism and an intermediate mechanism, wherein the fixing mechanism comprises a fixing platform and at least two supporting parts which are oppositely arranged, and the supporting parts are respectively connected with the fixing platform through test bolts; the middle mechanism is clamped between the at least two supporting parts; the connecting mechanism comprises a first connecting piece and a second connecting piece; the first connecting piece is connected with the fixed platform; the second connecting piece is connected with the intermediate mechanism. According to the bolt bending fatigue testing tool provided by the embodiment of the invention, through the matching of the fixing mechanism, the connecting mechanism and the intermediate mechanism, the tensile load loaded on the connecting mechanism can be converted into the bending load loaded on the testing bolt, and the purpose of testing the bending fatigue strength of the testing bolt is realized.
Description
Technical Field
The invention relates to the technical field of wind power, in particular to a bolt bending fatigue testing tool, a testing device and a testing method.
Background
In a wind generating set, a connecting bolt for a variable pitch bearing and a hub is one of the most important connecting bolts of the wind generating set, and the safety of the bolt for connecting the variable pitch bearing and the hub determines the safety of the whole fan. In the use process of the wind generating set, wind shear is large, the bolt connected with the variable pitch bearing and the hub bears dynamic load, and the bolt is extremely easy to be damaged by fatigue under the long-term action of the dynamic load.
In the prior art, a fatigue testing machine for bolts is mainly a tensile-tensile or tensile-compression experimental device, and can only realize the fatigue performance test of the axial tensile stress of the bolts and cannot test the bending fatigue of the bolts.
Disclosure of Invention
The invention provides a bolt bending fatigue testing tool, a testing device and a testing method, and aims to solve the problem of bolt bending fatigue detection.
In order to achieve the above object, an embodiment of the present invention provides a bolt bending fatigue testing fixture, which includes a fixing mechanism, a connecting mechanism and an intermediate mechanism, wherein the fixing mechanism includes a fixing platform and at least two supporting portions arranged oppositely, and the supporting portions are respectively connected with the fixing platform through a testing bolt; the middle mechanism is clamped between the at least two supporting parts; the connecting mechanism comprises a first connecting piece and a second connecting piece; the first connecting piece is connected with the fixed platform; the second connecting piece is connected with the intermediate mechanism.
Optionally, the intermediate mechanism comprises a central portion and an inclined portion connected to the central portion, the inclined portion having an end portion remote from the central portion, the end portion having an outer contact surface; the inner side surface of each supporting part is respectively provided with an inner contact surface which is attached to the outer contact surface.
Optionally, the inclined portion is centrosymmetric with respect to a perpendicular bisector of the central portion; the perpendicular bisector of the central part is parallel to the axis of the test bolt; alternatively, the inclined portion is integrally formed as a cone surrounding the perpendicular bisector of the center portion.
Optionally, the inner side surface of each support portion is provided with two parallel arc raceways, and the inner contact surface is formed on one of the two arc raceways.
Optionally, at least one of the support portions is adjustably connected with the fixed platform.
Optionally, the first connector is integrally formed with the fixed platform or is position-adjustably connected; and/or the second connecting member is integrally formed with or position adjustably connected to the intermediate mechanism.
According to a second aspect of the present invention, an embodiment of the present invention provides a bolt bending fatigue testing apparatus, including a fatigue testing machine and a bolt bending fatigue testing tool as described in any one of the foregoing items, where the bolt bending fatigue testing tool is connected to a first fixture of the fatigue testing machine through a first connecting member, and is connected to a second fixture of the fatigue testing machine through a second connecting member.
According to a third aspect of the present invention, an embodiment of the present invention provides a bolt bending fatigue testing method, which uses a bolt bending fatigue testing apparatus, and the testing method includes the following steps: the at least two supporting parts are respectively and fixedly connected with the fixed platform by using a test bolt; clamping the intermediate mechanism in the middle of the at least two support parts; connecting the fixed platform and the first fixture by using a first connecting piece; connecting the intermediate mechanism and the second fixture by using a second connecting piece; and starting a fatigue testing machine to perform a fatigue test.
Optionally, the relative position of the supports on the fixed platform is adjusted so that the intermediate mechanism is captured intermediate the at least two supports.
Optionally, the foregoing test method further includes: after the middle mechanism is clamped between the at least two supporting parts, the testing bolt is adjusted to fix the supporting parts and the fixed platform.
The invention has the advantages and positive effects that:
according to the bolt bending fatigue testing tool provided by the embodiment of the invention, through the matching of the fixing mechanism, the connecting mechanism and the intermediate mechanism, the tensile load loaded on the connecting mechanism can be converted into the bending load loaded on the testing bolt, so that the aim of testing the bending fatigue strength of the testing bolt is fulfilled; furthermore, the testing tool can simulate the real working condition and the stress state of the bolt, so that the fatigue state of the bolt under the bending force condition can be accurately detected; the size of the applied load can be accurately controlled, and the bending fatigue reliability of the test bolt can be accurately measured.
Drawings
FIG. 1 is a schematic structural diagram of a bolt bending fatigue test fixture according to an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a support part of the bolt bending fatigue test fixture in the embodiment of the invention;
FIG. 3 is a schematic structural diagram of a connecting mechanism of the bolt bending fatigue testing tool according to the embodiment of the invention;
FIG. 4 is a schematic structural diagram of a fixing platform of the bolt bending fatigue testing tool in the embodiment of the invention;
fig. 5 is a top view of the fixed platform of fig. 4.
Description of reference numerals:
1. a fixing mechanism; 11. a fixed platform; 111. a first intermediate connection hole; 112. a side connection hole; 12. a support portion; 121. an inner contact surface; 122. connecting holes; 2. a connecting mechanism; 21. a second connecting member; 22. a first connecting member; 3. an intermediate mechanism; 31. a central portion; 32. an inclined portion; 321. an external contact surface; 33. a second intermediate connection hole; 34. a perpendicular bisector; 4. and testing the bolt.
Detailed Description
Exemplary embodiments of the present invention are described in detail below with reference to the accompanying drawings.
The bolt bending fatigue testing tool, the testing device and the testing method provided by the embodiment of the invention are suitable for bending fatigue testing of any type of bolt, and are preferably applied to bending fatigue detection of the bolt for the variable-pitch bearing in the wind generating set, but not limited to detection of the specific bolt.
The following directions in this embodiment are defined as follows: as shown in fig. 1 to 3, the axial direction is the direction of the perpendicular bisector 34 of the central portion 31; the radial direction is a direction perpendicular to the perpendicular bisector 34. A position radially close to the perpendicular bisector 34 is an inner side, and a position radially distant from the perpendicular bisector 34 is an outer side. The second connecting member 21 is located above and the first connecting member 22 is located below.
The embodiment of the invention provides a bolt bending fatigue testing tool which comprises a fixing mechanism 1, a connecting mechanism 2 and an intermediate mechanism 3, and the components of all the parts are described in detail below.
According to the bolt bending fatigue test tool provided by the embodiment of the invention, the fixing mechanism 1, the connecting mechanism 2 and the middle mechanism 3 are arranged, the structure is simple, the operation is easy, the bending fatigue load test on the bolt can be realized, the test tool structure is very close to the mounting structure of the bolt in actual use, the bending fatigue test is closer to the working condition of the bolt in actual use, and the test result is more accurate.
The fixing mechanism 1 includes a fixing platform 11 and at least two opposite supporting portions 12, and the supporting portions 12 are connected to the fixing platform 11 through the testing bolts 4.
The intermediate mechanism 3 includes a central portion 31 and an inclined portion 32 connected to the central portion 31. Preferably, the inclined portion 32 is centrosymmetric with respect to the perpendicular bisector 34 of the central portion 31; the perpendicular bisector 34 is parallel to the axis of the test bolt 4. The inclined portion 32 has an end portion remote from the central portion 31, the end portion having an outer contact surface 321; the inner side surface of each support part 12 is provided with an inner contact surface 121; the intermediate mechanism 3 is held between at least two support parts 12, and the outer contact surfaces 321 respectively abut against the inner contact surfaces 121 of each support part 12. Preferably, the inner contact surface 121 and the outer contact surface 321 are both arc-shaped, and the radian of the outer contact surface 321 is equal to the radian of the inner contact surface 121 on the support portion 12, so that the outer contact surface 321 on the inclined portion 32 can be completely attached to the inner contact surface 121 of the support portion 12, and thus, not only the connection firmness of the intermediate mechanism 3 and the support portion 12 is ensured, but also the load can be better transmitted to the test bolt 4 through the intermediate mechanism 3. The inner contact surface 121 and the outer contact surface 321 are not limited to the arc-shaped surfaces, and any form of contact surface that can transfer force between the inclined portion 32 and the support portion 12 is within the limitation of the present embodiment.
Further, different intermediate mechanisms 3 may be provided, the inclined portion 32 of each intermediate mechanism 3 having different angles with the perpendicular bisector 34 under test. By replacing different intermediate mechanisms 3 and changing the contact angle between the inclined part 32 and the supporting part 12, the aim of performing bending fatigue test on the test bolt 4 from different stress angles can be achieved.
Alternatively, in order to enable the intermediate mechanism 3 to be easily mounted between at least two support portions 12, at least one of the support portions 12 is position-adjustably connected with the fixed platform 11. When the intermediate mechanism 3 needs to be installed, the distance between the two supporting parts 12 can be increased by adjusting the positions of the supporting parts 12; the intermediate mechanism 3 is then arranged between the two support parts 12; the adjusted position of the support parts 12 is then used to reduce the distance between the two support parts 12, so that the outer contact surface 321 is in contact with the inner contact surface 121, and the mounting of the intermediate mechanism 3 is completed.
As shown in fig. 4 and 5, a first middle connection hole 111 for connecting with the first connection member 22 is formed in the middle of the fixing platform 11, two side connection holes 112 for connecting the test bolt 4, the support portion 12 and the fixing platform 11 together are respectively formed in the fixing platform 11 on both sides of the first middle connection hole 111, one of the side connection holes 112 is a long hole, so that the support portion 12 can be movably adjusted relative to the long hole, the position can be adjusted at any time to install the middle mechanism 3, and the other is a threaded hole or a light hole; or both side coupling holes 112 are elongated holes so that both support portions 12 can be positionally adjusted with respect to the elongated holes.
Alternatively, on the support portion 12, along the axial direction of the support portion 12, a connection hole 122 is opened therethrough, and the connection hole 122 may be a light hole or a threaded hole, preferably a light hole. The test bolt 4 can pass through the connection hole 122 and a long hole, a smooth hole or a threaded hole on the fixing platform 11 to fixedly connect the support part 12 to the fixing platform 11.
Specifically, when the side connection hole 112 on the fixing platform is a threaded hole, the fixing mode is that the screw of the test bolt 4 passes through the support part 12, and the threaded end of the screw is in threaded connection with the threaded hole on the fixing platform 11; when the side connection holes 112 on the fixing platform are long holes or light holes, as shown in fig. 1, the screws of the test bolts 4 respectively pass through the long holes or light holes of the support portion 12 and the fixing platform 11, and then are connected and fixed with the screws of the test bolts 4 through nuts on the side of the fixing platform 11 away from the support portion 12.
The support part 12 can be made of a metal material with high strength and toughness, and in the embodiment of the invention, the material of the support part 12 is made of 42CrMo, which aims to keep consistent with the material of the wind turbine pitch bearing. The shape of the two supports 12 preferably approximates the shape of a partial section of the pitch bearing in the circumferential direction. Optionally, the inner contact surface 121 is provided to make the stress condition of the support portion 12 closer to the real stress condition of the bolt for the pitch bearing in the wind turbine generator, in other words, the support portion 12 is sleeved on the test bolt 4, and the stress condition of the support portion 12 is equivalent to the stress condition of the test bolt 4 under the action of the pitch bearing, so that the stress condition of the test bolt 4 is also closer to the real stress condition of the bolt for the pitch bearing in the wind turbine generator.
The material of the intermediate mechanism 3 can be consistent with that of the supporting part 12, and the intermediate mechanism can also be made of a material with better rigidity and toughness. In the intermediate mechanism 3, the perpendicular bisector 34 of the central portion 31 and the axis of the test bolt 4 are parallel to each other, and are provided to ensure that the test bolt 4 can firmly fix the support portion 12 to the fixed platform 11.
specifically, as shown in fig. 3, the inclined portions 32 are integrally formed at both ends of the central portion 31, and the inclined portions 32 are symmetrical with respect to the center line 34 of the central portion 31, since the inclined portions 32 of the central portion 3 have a predetermined included angle with the center line 34 of the central portion 31, and the inclined portions 32 at both sides have an equal included angle with the center line 34 of the central portion 31, and the axis of the support portion 12 is parallel to the center line 34 of the central portion 31, the included angle between the inclined portions 32 and the support means is equal to the predetermined included angle, assuming that the included angle between the inclined portions 32 and the support portion 12 is α, when the fatigue testing machine applies an upward tensile force F to the central portion 3 through the second link 21, the force applied to the inner contact surface 121 by the inclined portions 32 on one side is F × sin α, and the force applied to the inner contact surface 121 on the other side is F × sin α, and the resultant force applied to the inner contact surface 121 is F. therefore, the force applied to the test bolt 4 is transmitted to the test bolt 4, and thus the purpose of applying a radial force to the test bolt 4 is achieved, and the tensile force applied to the test bolt 4 is also provided to the support portion 12.
In the preferred embodiment of the present invention, the inner side surface of each support portion 12 is provided with two parallel arc raceways, and the inner contact surface 121 is formed on one of the two arc raceways, and the two arc raceways are smoothly transited. In the prior art, the variable-pitch bearing mostly adopts a double-row ball bearing, and two circular arc raceways are respectively arranged on an outer ring and an inner ring of the bearing. The arrangement is to better simulate the real stress condition of the bolt for the pitch bearing.
A second intermediate connecting hole 33 for connecting with the second connecting piece 21 is further opened at the middle position of the central part 31 of the intermediate mechanism 3, and the structure of the second intermediate connecting hole 33 can be a threaded hole, a unthreaded hole, a long hole or the like, and is preferably a threaded hole.
Alternatively, there are at least two inclined portions 32, and each inclined portion 32 is respectively engaged with one of the supporting portions 12. However, the number of the inclined portions 32 and the supporting portions 12 is not limited to two, and may be two or more, for example, three or four, so as to more sufficiently simulate the actual installation of the bolt. Alternatively, the inclined portion 32 is integrally formed as a cone surrounding the perpendicular bisector 34. At least two supporting portions 12 coupled to the inclined portion 32 may be provided around the inclined portion 32.
The connecting mechanism 2 comprises a first connecting piece 22 and a second connecting piece 21; the first connecting piece 22 is connected with the fixed platform 11; the second connector 21 is connected to the central portion 31. In the embodiment of the present invention, the first connecting member 22 and the second connecting member 21 are both bolts.
One end of the first connecting member 22 is connected to the fixed platform 11 through the first intermediate connecting hole 111. Optionally, the first middle connection hole 111 is a threaded hole, and the screw of the first connection member 22 is in threaded connection with the first middle connection hole 111; or the screw of the first connecting piece 22 penetrates out of the first middle connecting hole 111 from the upper part of the fixed platform 11, and a gasket and a nut are arranged above the fixed platform 11 to be connected with the screw of the first connecting piece 22, so that the surface contact stress of the first connecting piece 22 and the fixed platform 11 is reduced, and the connection stability of the fixed platform 11 and the supporting part 12 is further improved. In both of the above two ways, the relative distance between the bolt head of the first connecting member 22 and the fixed platform 11 can be adjusted. The fixing manner between the first connecting member 22 and the fixed platform 11 is not limited to the above two manners, and any first connecting member structure capable of transmitting the tensile force of the fatigue testing machine to the fixed platform is within the limit of the embodiment.
The bolt head of the first connecting member 22 may be connected to a fatigue testing machine, which may apply a downward tensile force to the fixed platform 11 through the first connecting member 22. The fatigue tester can transmit the load to the test bolt 4 through the fixing platform 11. Furthermore, in another alternative, the first connecting member 22 may also be directly formed integrally with the fixed platform 11.
The screw of the second connecting member 21 is connected with the second intermediate connecting hole 33 of the central portion 31, optionally, the second intermediate connecting hole 33 is a threaded hole, and the screw of the second connecting member 21 is in threaded fit connection with the second intermediate connecting hole 33. Further, the screw of the second connecting member 21 may pass through the central portion 31 from below the central portion 31, and a washer and a nut may be added to the screw of the second connecting member 21 below the central portion 31 in fig. 1 to better and more stably apply an upward pulling force to the central portion; further, as shown in fig. 1, a washer and a nut that are engaged with the screw of the second connecting member 21 may be additionally installed at both upper and lower ends of the central portion 31, respectively, to reduce the surface contact stress of the central portion 31 and further improve the connection stability of the second connecting member 21 with the central portion 31.
The bolt head of the second connecting member 21 is connected to a fatigue testing machine which can apply an upward tensile force to the intermediate mechanism 3 through the second connecting member 21. In a manner not shown in the middle, the second connecting member 21 may also be directly integrally formed with the central portion 31.
The fixing manner between the second link 21 and the central portion 31 is not limited to the above two manners, and any second link structure capable of transmitting the tensile force of the fatigue testing machine to the central portion 31 is within the limit of the present embodiment.
According to the bolt bending fatigue testing tool provided by the embodiment of the invention, through the matching of the fixing mechanism 1, the connecting mechanism 2 and the middle mechanism 3, the tensile load loaded on the connecting mechanism 2 can be converted into the bending load loaded on the testing bolt 4, so that the purpose of testing the bending fatigue strength of the testing bolt 4 is realized; furthermore, the real working condition and the stress state of the test bolt 4 can be simulated through the intermediate mechanism 3 and the supporting part 12, so that the fatigue state of the test bolt 4 under the condition of bending force can be accurately detected; the magnitude of the applied load can be accurately controlled, and the bending fatigue reliability of the test bolt 4 can be accurately measured.
Example two
According to a second aspect of the present invention, a bolt bending fatigue testing apparatus is provided in the second embodiment of the present invention, which includes a fatigue testing machine and the bolt bending fatigue testing tool of the first embodiment, wherein the bolt bending fatigue testing tool is connected to a first fixture of the fatigue testing machine through a first connecting member 22, and is connected to a second fixture of the fatigue testing machine through a second connecting member 21.
The bolt bending fatigue testing device provided by the embodiment of the invention can effectively realize the purpose of testing the bending fatigue of the testing bolt 4 by connecting the bolt bending fatigue testing tool with the fatigue testing machine, and meanwhile, the bolt bending fatigue testing device also has good universality and can be used for testing the bending fatigue of different types of testing bolts 4.
The testing device provided by the second embodiment of the invention has good universality, and the purposes of performing fatigue tests on different testing bolts 4 from different angles are achieved by arranging arc-shaped contact surfaces on the intermediate mechanism 3 and the connecting mechanism 2 and adjusting the contact angle between the intermediate mechanism 3 and the fixing mechanism 1.
EXAMPLE III
According to a third aspect of the present invention, a third embodiment of the present invention provides a bolt bending fatigue testing method, which uses the bolt bending fatigue testing apparatus according to the previous embodiment, and the testing method includes the following steps: at least two supporting parts 12 are respectively and fixedly connected to the fixed platform 11 by using the test bolts 4; clamping the intermediate mechanism 3 in the middle of the at least two support parts 12; connecting the fixed platform 11 and the first fixture by a first connecting piece 22; connecting the central portion 31 and the second fixture with the second connector 21; and starting a fatigue testing machine to perform a fatigue test.
In a preferred mode, the test bolt 4 passes through the unthreaded hole on the supporting portion 12, and the supporting portion 12 is fixedly connected to the fixing platform 11 on both sides of the first middle connecting hole 111, wherein one side of the fixing platform 11 is provided with a long hole, and the other side of the fixing platform 11 is provided with a threaded hole, and when the test bolt 4 needs to be installed on the fixing platform 11, the nut on the test bolt 4 is not screwed temporarily; the intermediate mechanism 3 is arranged in the middle of the two support portions 12; by adjusting the relative position of the test bolt 4 connected with at least one support part 12 in the long hole on the fixed platform 11, the outer contact surfaces 321 of the inclined parts 32 are respectively attached to and kept in close contact with the inner contact surfaces 121 on the support parts 12; adjusting the intermediate mechanism 3 to a proper position, then locking the nut on the test bolt 4, and fixing the positions of the support part 12 and the intermediate mechanism 3.
The first connecting member 22 is screwed into the first intermediate connecting hole 111 of the fixed platform 11. Firstly, arranging a first group of nuts and gaskets at the upper end of a second connecting piece 21, then screwing the second connecting piece 21 into a second middle connecting hole 33 on a central part 31 of the middle mechanism 3, arranging a second group of nuts and gaskets on the second connecting piece below the central part 31, then connecting the first connecting piece 22 with a first fixture of a fatigue testing machine and adjusting the proper length, and connecting the second connecting piece 21 with a second fixture of the fatigue testing machine and adjusting the proper length; and starting the fatigue testing machine to perform a fatigue test. The fatigue testing machine can apply a bending fatigue test to the test bolt 4 by the cooperation of the first connecting member 22 and the second connecting member 21.
Alternatively, the relative position of the support parts 12 on the fixed platform 11 is adjusted so that the intermediate mechanism 3 is held in the middle of at least two support parts 12; after the intermediate mechanism 3 is clamped in the middle of the at least two support parts 12, the test bolts 4 are adjusted to fix the support parts 12 and the fixed platform 11.
Specifically, the relative position between the support portion 12 and the long hole of the fixed platform 11 can be adjusted to ensure that the outer contact surface 321 is attached to the inner contact surface 121, and after the inner contact surface 121 is attached to the outer contact surface 321, the nut on the test bolt 4 is screwed, so that the support portion 12 and the fixed platform 11 are fixed.
In each of the above steps, except that the nut corresponding to the long hole is not tightened when the relative position of the support portion 12 and the long hole on the fixed platform 11 is adjusted, in each of the other steps, before the fatigue testing machine is started, the bolts and nuts should be tightened and checked to ensure the reliability of connection and avoid danger. And after the test is finished, recording data, detaching the tool and finishing the test work.
According to the bolt bending fatigue testing method provided by the third embodiment of the invention, the testing of the bending fatigue of the testing bolt 4 can be realized only by adjusting the contact angle between the intermediate mechanism 3 and the connecting mechanism 2 and applying a load. The method has the advantages of simple required steps, convenience in operation and capability of completing the bending fatigue test of the test bolt 4 in a short time and high efficiency.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A bolt bending fatigue test tool is characterized by comprising a fixing mechanism (1), a connecting mechanism (2) and a middle mechanism (3),
the fixing mechanism (1) comprises a fixing platform (11) and at least two opposite supporting parts (12), wherein the supporting parts (12) are respectively connected with the fixing platform (11) through test bolts (4);
the intermediate mechanism (3) comprises a central part (31) and an inclined part (32) connected with the central part (31), the inclined part (32) is provided with an end part far away from the central part (31), and the intermediate mechanism (3) is clamped between at least two supporting parts (12) through the contact of the end part and the supporting parts (12);
the connecting mechanism (2) comprises a first connecting piece (22) and a second connecting piece (21); the first connecting piece (22) is connected with the fixed platform (11); the second connecting piece (21) is connected with the intermediate mechanism (3).
2. The bolt bending fatigue testing tooling of claim 1, wherein the end portion has an outer contact surface (321); the inner side surface of each supporting part (12) is respectively provided with an inner contact surface (121) which is attached to the outer contact surface (321).
3. The bolt bending fatigue testing tool according to claim 2, wherein the inclined portion (32) is centrosymmetric with respect to a perpendicular bisector (34) of the central portion (31); the perpendicular bisector (34) of the central portion (31) being parallel to the axis of the test bolt (4);
or,
the inclined portion (32) is integrally formed as a cone surrounding a perpendicular bisector (34) of the central portion (31).
4. The bolt bending fatigue testing tool of claim 2,
the inner side surface of each supporting part (12) is provided with two parallel arc raceways, and the inner contact surface (121) is formed on one of the two arc raceways.
5. The bolt bending fatigue testing tool according to claim 1, characterized in that at least one of the support portions (12) is connected with the fixed platform (11) in a position-adjustable manner.
6. The bolt bending fatigue testing tool according to claim 1, characterized in that the first connecting piece (22) is integrally formed with the fixed platform (11) or is connected with a position adjustable manner;
and/or the like and/or,
the second connecting element (21) is integrally formed with the intermediate member (3) or is connected in a position-adjustable manner.
7. A bolt bending fatigue testing device, characterized by comprising a fatigue testing machine and the bolt bending fatigue testing tool according to any one of claims 1-6, wherein the bolt bending fatigue testing tool is connected with a first fixture of the fatigue testing machine through the first connecting piece (22) and is connected with a second fixture of the fatigue testing machine through the second connecting piece (21).
8. A bolt bending fatigue testing method using the bolt bending fatigue testing apparatus according to claim 7, characterized by comprising the steps of:
at least two supporting parts (12) are respectively fixedly connected with the fixed platform (11) by the test bolt (4);
-clamping the intermediate mechanism (3) in the middle of at least two of the supports (12);
-connecting the fixed platform (11) and the first fixture with the first connector (22);
-connecting the intermediate organ (3) and the second fixture with the second connection piece (21);
and starting a fatigue testing machine to perform a fatigue test.
9. Testing method according to claim 8, characterized in that the relative position of the support parts (12) on the fixed platform (11) is adjusted such that the intermediate organ (3) is held in the middle of at least two of the support parts (12).
10. The testing method of claim 9, further comprising: after the intermediate mechanism (3) is clamped between at least two support parts (12), the test bolt (4) is adjusted to fix the support parts (12) and the fixed platform (11).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610448382.3A CN107525722B (en) | 2016-06-20 | 2016-06-20 | Bolt bending fatigue testing tool, testing device and testing method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610448382.3A CN107525722B (en) | 2016-06-20 | 2016-06-20 | Bolt bending fatigue testing tool, testing device and testing method |
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| CN107525722A CN107525722A (en) | 2017-12-29 |
| CN107525722B true CN107525722B (en) | 2018-11-20 |
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| CN110108575A (en) * | 2019-01-03 | 2019-08-09 | 北京交通大学 | Bolt pure bending fatigue test tool and system |
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| CN202057556U (en) * | 2011-05-19 | 2011-11-30 | 中国石油集团工程设计有限责任公司 | Bending corrosion fatigue tester |
| CN103471843A (en) * | 2013-10-15 | 2013-12-25 | 北京航空航天大学 | Bending multi-axial fatigue test mechanism |
| CN104677749A (en) * | 2015-03-18 | 2015-06-03 | 北京科技大学 | Metal diaphragm bending fatigue measurement device and method for diaphragm compressor |
| JP2016075531A (en) * | 2014-10-03 | 2016-05-12 | 三菱重工業株式会社 | Multiaxial load application method and multiaxial load application mechanism |
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2016
- 2016-06-20 CN CN201610448382.3A patent/CN107525722B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202057556U (en) * | 2011-05-19 | 2011-11-30 | 中国石油集团工程设计有限责任公司 | Bending corrosion fatigue tester |
| CN103471843A (en) * | 2013-10-15 | 2013-12-25 | 北京航空航天大学 | Bending multi-axial fatigue test mechanism |
| JP2016075531A (en) * | 2014-10-03 | 2016-05-12 | 三菱重工業株式会社 | Multiaxial load application method and multiaxial load application mechanism |
| CN104677749A (en) * | 2015-03-18 | 2015-06-03 | 北京科技大学 | Metal diaphragm bending fatigue measurement device and method for diaphragm compressor |
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