CN111665149A - Sample cooling device during room temperature fatigue test - Google Patents
Sample cooling device during room temperature fatigue test Download PDFInfo
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- CN111665149A CN111665149A CN202010542598.2A CN202010542598A CN111665149A CN 111665149 A CN111665149 A CN 111665149A CN 202010542598 A CN202010542598 A CN 202010542598A CN 111665149 A CN111665149 A CN 111665149A
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- 238000009661 fatigue test Methods 0.000 title claims abstract description 41
- 238000001073 sample cooling Methods 0.000 title claims abstract description 11
- 238000001816 cooling Methods 0.000 claims abstract description 108
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- 238000010146 3D printing Methods 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 4
- 239000002952 polymeric resin Substances 0.000 claims description 4
- 229920003002 synthetic resin Polymers 0.000 claims description 4
- 238000012360 testing method Methods 0.000 abstract description 49
- 239000000463 material Substances 0.000 abstract description 33
- 238000002474 experimental method Methods 0.000 abstract 1
- 239000003570 air Substances 0.000 description 66
- 239000000523 sample Substances 0.000 description 30
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 14
- 238000000034 method Methods 0.000 description 14
- 239000007788 liquid Substances 0.000 description 7
- 229910052757 nitrogen Inorganic materials 0.000 description 7
- 239000000110 cooling liquid Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 238000005057 refrigeration Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000005457 optimization Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000001314 paroxysmal effect Effects 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 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
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
-
- 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
-
- 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
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
-
- 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
-
- 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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0228—Low temperature; Cooling means
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- Physics & Mathematics (AREA)
- 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 sample cooling device in a room temperature fatigue test, and belongs to the technical field of material mechanical property tests. The cooling device comprises an air compressor, a supporting component and a cooling ring; the air compressor is used for providing cooling source compressed air, the compressed air is conveyed into the cooling ring through the supporting component and then is sprayed on the surface of the fatigue sample through the air outlet formed in the cooling ring, and therefore the temperature of the sample to be tested is lowered. The device can utilize compressed air to carry out uniform cooling to the sample that awaits measuring effectively, and can not exert an influence to the organizational performance of material during the experiment to improvement test frequency that can be by a wide margin, and then accelerate test cycle, reduce experimental expense.
Description
Technical Field
The invention relates to the technical field of material mechanical property tests, in particular to a novel device for cooling a sample during a room temperature fatigue test.
Background
The fatigue problem is that the material must face during practical use, and the failure of a component due to fatigue accounts for about 80% of all failure failures of the component. Fatigue fracture often has the characteristics of paroxysmal, catastrophic, therefore the fatigue problem of material keeps off in the inevitable mountain of component practical application in-process, obtains accurate fatigue data of material is the essential link before the practical application of material, therefore can become especially important by fast accurate measurement material fatigue performance. For fatigue test, under the condition of meeting the requirements, the faster the test frequency is, the faster the efficiency is, the shorter the test period is, the lower the test cost is, and the more the popularization and application of the material are facilitated.
The frequency is better when the temperature is higher under the premise of ensuring that the sample does not generate heat and the external load is accurate in the room temperature fatigue test process. Most of materials accelerate the fatigue test frequency and cannot cause test heating, so that the test frequency can be improved as fast as possible on the premise that the materials do not heat in the test process, the test frequency of general materials is 40-50 Hz, the cost is 100-200 yuan/hour for an electro-hydraulic servo fatigue testing machine, and the test time required for each group of materials is about 300 hours. However, some materials are very sensitive to frequency-induced heating, and once heated, the materials may cause structural changes inside the materials, thereby rendering the test data invalid. Therefore, in order to ensure the accuracy of test data, the test frequency can be reduced only greatly, the test frequency of some materials can be reduced even to 2Hz, the time cost and the expense required by calculation according to the same test parameters can be increased by 20 times, and the development difficulty of the materials is greatly increased.
The traditional cooling method is cooling by adopting a cooling liquid refrigeration or liquid nitrogen refrigeration mode. However, the methods have defects that the cooling liquid refrigeration requires that the test sample is soaked in the cooling liquid, but the test machine equipment is always vibrated in the whole test process, the leakage of the cooling liquid caused by vibration is inevitable in the test process, the leaked cooling liquid can generate corrosion damage to a workbench or an actuating cylinder of the fatigue testing machine, the damage of the testing machine can be seriously and even possibly caused, and the maintenance cost is from tens of thousands to hundreds of thousands. Liquid nitrogen refrigeration utilizes the heat absorbed by liquid nitrogen when it is vaporized to remove the heat generated due to frequency, but this cooling method has two disadvantages: 1) the liquid nitrogen can rapidly absorb ambient heat in the vaporization process to cause the ambient temperature to be rapidly reduced, the moisture in the ambient air can be liquefied into small water drops to be gathered on the surface of the sample, and the small water drops can corrode the material to cause the inaccurate test result; in addition, the converged small water drops converge on the testing machine along the testing material, so that the clamp and the workbench of the testing machine are corroded, the aging degree of the testing machine is accelerated, and the testing cost is increased; 2) the fatigue test is a long-time working process, a material sample normally works for dozens of hours in the fatigue test, the cost of liquid nitrogen is very high, the liquid nitrogen is consumed very quickly, and once the liquid nitrogen is consumed and cannot be supplemented in time, the sample is heated quickly in the process, so that the test result is invalid, and the test cost is also increased.
In order to improve the accuracy of the fatigue test of the material, accelerate the fatigue test period of the heating material and provide reliable reference for subsequent component use, it is necessary to improve the existing fatigue test device.
Disclosure of Invention
The invention aims to provide a sample cooling device for room temperature fatigue tests, which can effectively and uniformly cool a sample to be tested by utilizing compressed air, and can not influence the structure performance of a material during the test, thereby greatly improving the test frequency, further accelerating the test period and reducing the test cost.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a sample cooling device used in a room temperature fatigue test comprises a compressor, a supporting part and a cooling ring; the compressor is used for providing cooling source compressed air, the compressed air is conveyed into the cooling ring through the supporting part and then is sprayed on the surface of the fatigue sample through the air exhaust hole formed in the cooling ring, and therefore the temperature of the sample to be tested is lowered.
The supporting component is of a cylindrical structure, and one end of the supporting component is provided with a mounting hole and is used for being connected with a fatigue testing machine; and the side wall of the supporting part, which is close to one side of the mounting hole, is also provided with an air inlet, the air inlet is connected with an air inlet pipe in the supporting part, and the air inlet pipe is communicated with the inner part of the cooling ring.
The other end of the supporting component is provided with four air outlets, the air inlet pipe comprises a main pipeline and four branch pipes branched from the main pipeline, and the four branch pipes are respectively connected with the four air outlets; compressed air generated by the compressor sequentially passes through the air inlet I, the air inlet pipe main pipeline, the air inlet pipe branch pipe and the air outlet and is input into the cooling ring.
The cooling ring is formed by assembling 4 hollow cooling bodies with the same structure, each hollow cooling body comprises a semi-annular structure and a connecting part, and three hollow shafts are arranged on the semi-annular structures; one free end of the semi-annular structure is closed, the other free end of the semi-annular structure is provided with a connecting part, and a columnar pipe is arranged on the connecting part; the cylindrical pipe and the three hollow shafts are arranged on the same side surface of the hollow cooling body.
The assembly of 4 hollow cooling bodies of the same structure of cooling ring pairwise relatively is: the semi-annular structures of the two hollow cooling bodies are oppositely arranged to be spliced into a circular ring shape, the columnar pipes on the two hollow cooling bodies respectively extend into the air outlets at the end parts of the supporting parts, and sealing rings are arranged in the air outlets so as to facilitate the columnar pipes to extend into the air outlets to form sealing structures; the semi-annular structure may be rotated along a cylindrical tube extending into the support member. After the semi-annular structures of the other two hollow cooling bodies are oppositely arranged and spliced into a circular ring, hollow shafts on the two formed circular ring structures are connected in a one-to-one mode, and the columnar pipes on the other two hollow cooling bodies also extend into the air outlet at the end part of the supporting part.
The hollow shaft is provided with a longitudinal row of exhaust holes, the hollow shaft is also sleeved with a blocking piece capable of rotating, and whether each hollow rotating shaft exhausts gas or not can be controlled through rotation of the blocking piece, so that the exhaust amount and the exhaust position of the exhaust gas of the whole device are regulated and controlled.
The supporting component and the cooling ring are formed by 3D printing of high polymer resin.
The air compressor is provided with a pressure regulating valve which can control the pressure of the supplied compressed air.
The invention has the following advantages and beneficial effects:
1. the invention designs a set of cooling device for the fatigue test sample, utilizes compressed air to cool the experimental material, and can solve the problem of heating of the material due to accelerated frequency in the experimental process to a greater extent under the conditions of not damaging the surface of the material, a fatigue testing machine and ensuring the accuracy of experimental data, thereby greatly improving the testing efficiency and the accuracy of the material fatigue test. And the device can adjust the cooling rate of sample through adjusting compressed air pressure, air outlet position and air outlet quantity to different sample sizes, has extensive applicability, use cost low, maintains simple characteristics.
2. The support part and the cooling ring are formed by 3D printing of high polymer resin, and have the characteristics of good sealing property, low density and good attractiveness. The air compressor is mainly used for providing cooling source compressed air, the compressed air provided by the air compressor is uniformly sprayed on the surface of the sample through the air outlet on the cooling ring, the compressed air can take away heat generated by the sample due to frequency improvement without influencing material tissues, and the device reduces the temperature of the sample material by using a mode of accelerating air flow around the sample material without severely reducing the air temperature around the sample material, so that the fatigue testing machine is not damaged due to generation of condensed water. In addition, the air compressor only needs electric power for working, and the electric power is a relatively stable output, so the cooling mode can be stably provided, and the use cost and the maintenance cost are low, and the whole test cost cannot be increased.
3. After the cooling device is used in a fatigue test, the heating problem in the fatigue process of some materials is effectively solved, the test materials are not influenced in the whole cooling process, and the fatigue testing machine is not damaged; the use and maintenance costs of the complete equipment are low, and the use of the detachable cooling ring can prolong the service life of the cooling device. Practice proves that: the device's use can make test efficiency improve more than 3 times, has greatly improved the validity of experimental data, avoids carrying out the repetition test, has reduced the wasting of resources problem that the repetition test brought to the use cost of testing machine has been reduced.
Drawings
FIG. 1 is a schematic view of the overall structure of the cooling device of the present invention.
Fig. 2 is a schematic view of the structure of the cooling device of the present invention (left side view of fig. 1).
FIG. 3 is a schematic view of a cooling ring structure of the cooling device of the present invention.
FIG. 4 is a schematic view of the rotary shaft, baffle plate and exhaust hole of the cooling device of the present invention.
Wherein: 100-a support member; 101-mounting holes; 102-an air inlet; 103-a main pipeline; 200-a cooling ring; 201-semi-annular structure; 202-hollow shaft; 203-a connecting portion; 204-air exhaust holes; 205-cylindrical tube; 206-baffle plate.
Detailed Description
For a further understanding of the present invention, the following description is given in conjunction with the examples which are set forth to illustrate, but are not to be construed to limit the present invention, features and advantages.
The invention provides a sample cooling device for a room temperature fatigue test, which has a structure shown in figures 1-4. The cooling device comprises a compressor, a supporting part 100 and a cooling ring 200; the compressor is used for providing cooling source compressed air, the compressed air is conveyed into the cooling ring 200 through the supporting part 100 and then is sprayed on the surface of the fatigue sample through an exhaust hole 204 formed in the cooling ring, and therefore the temperature of the sample to be measured is reduced; the specific structure of each part is described as follows:
as shown in fig. 1, the supporting component is a cylindrical structure, and one end of the supporting component is provided with a mounting hole 101 for connecting with a fatigue testing machine; an air inlet 102 (fig. 2) is arranged on the side wall of the supporting part close to one side of the mounting hole, four air outlets are arranged at the end part of the supporting part far away from the other end of the mounting hole, and an air inlet pipe is arranged in the supporting part; the intake pipe includes trunk line 103 and four branch pipes that the trunk line divides, and the air inlet is connected with the trunk line 103 of intake pipe, and four gas outlets are connected respectively to four branch pipes.
As shown in fig. 3, the cooling ring 200 is assembled by 4 hollow cooling bodies with the same structure, and the hollow cooling bodies include a semi-ring structure 201 and a connecting part 203, and three hollow shafts 202 are arranged on the semi-ring structure; one free end of the semi-annular structure is closed, the other free end of the semi-annular structure is connected with a connecting part, and a columnar pipe 205 is arranged on the connecting part; the cylindrical tube 205 and the three hollow shafts 202 are all provided on the same side surface of the hollow cooling body.
The assembly of 4 hollow cooling bodies of the same structure of cooling ring pairwise relatively is: the semi-annular structures of the two hollow cooling bodies are oppositely arranged to be spliced into a circular ring shape, the columnar pipes on the two hollow cooling bodies respectively extend into the air outlets at the end parts of the supporting parts, and sealing rings are arranged in the air outlets so as to facilitate the columnar pipes to extend into the air outlets to form sealing structures; the semi-annular structure may be rotated along a cylindrical tube extending into the support member. After the semi-annular structures of the other two hollow cooling bodies are oppositely arranged and spliced into a circular ring, hollow shafts on the two formed circular ring structures are connected in a one-to-one mode (the butt joint ends are arranged into structures capable of being mutually spliced), and then the columnar pipes on the other two hollow cooling bodies also extend into the air outlet at the end part of the supporting part.
As shown in fig. 4, a longitudinal row of air exhaust holes 204 is formed on the hollow shaft 202, a rotatable baffle 206 is further sleeved on the hollow shaft, and whether the hollow shafts exhaust air or not can be controlled by rotating the baffle, so that the exhaust amount and the exhaust position of the exhaust air of the whole device can be regulated and controlled.
Compressed air generated by the compressor sequentially passes through the air inlet, the air inlet pipe main pipeline, the air inlet pipe branch pipe and the air outlet to be input into the cooling ring and then is sequentially discharged from the hollow shaft and the air exhaust hole on the cooling ring.
The supporting component and the cooling ring are formed by 3D printing of high polymer resin.
The air compressor is provided with a pressure regulating valve which can control the pressure of the supplied compressed air.
The use process of the sample cooling device for the room-temperature fatigue test is as follows:
(1) processing a supporting part and a cooling ring according to the requirements of a drawing;
(2) the cooling ring and the support part were assembled and mounted on a fatigue testing machine.
(3) An air compressor is connected to the air inlet of the support portion through a pipe.
(4) The separation blade on the cooling ring is rotated to expose the exhaust hole on the hollow rotating shaft of the gas to be exhausted, the fatigue sample with the measured size is installed on the testing machine according to the testing steps, and the rotation angle of the separation blade on the cooling ring and the position of the exhaust port are adjusted according to the shape and the size of the sample, so that the exhaust port is just positioned at the working section of the sample.
(5) And setting fatigue test parameters as required and starting a fatigue test.
(6) The output pressure of the compressed air is adjusted according to the surface condition of the sample, and the optimal cooling effect is achieved.
In the process of installing the sample, the cooling device of the invention must ensure that the working section of the sample cannot be contacted with the cooling ring and the cooling ring is not stressed. The cooling device cannot be used in environments containing corrosive media and the use temperature cannot exceed 100 ℃.
The cooling mode of the fatigue test sample cooling device designed by the invention has diversity, and the pressure regulating valve on the air compressor can regulate the pressure of compressed air; the cooling ring can be adjusted at different angles through the columnar pipe; the air outlet hole position on the cooling ring is provided with a baffle plate, and the baffle plate can adjust the position and the number of the air outlet hole through rotation. The cooling device can adjust and combine in multiple modes according to different test materials and sample sizes, so that the optimization of the cooling mode is achieved.
The cooling device is detachable, and the cooling ring can be moved away by rotating the columnar tube when loading and unloading the sample, so that the operation space is enlarged. Meanwhile, the cooling ring is connected with the supporting part in an inserting mode, and is easy to replace. Can many processing some as reserve, after the damage appears in the cooling ring in the use, can direct quick replacement spare part continue to test, great improvement test efficiency, also reduced experimental facilities's maintenance cost simultaneously.
The sample cooling device is matched with the fatigue testing machine for use in the room-temperature fatigue test, can effectively utilize compressed air to uniformly cool the sample, and does not influence the structure performance of the material, so that the test frequency can be greatly improved, the test period is further accelerated, and the test cost is reduced. The uneven problem of temperature on sample surface can be avoided effectively through the improvement of cooling ring cooling structure, and the device can all realize sample cooling optimization through adjusting cooling ring angle and venthole distribution to different sample sizes, guarantees experimental accuracy and wide application. The cooling device also has the characteristics of high reliability, simple operation, low cost, convenient maintenance and the like.
Claims (8)
1. The utility model provides a sample cooling device during room temperature fatigue test which characterized in that: the cooling device comprises an air compressor, a supporting component and a cooling ring; the air compressor is used for providing cooling source compressed air, the compressed air is conveyed into the cooling ring through the supporting part and then is sprayed on the surface of the fatigue sample through the air exhaust hole formed in the cooling ring, and therefore the temperature of the sample to be tested is lowered.
2. The apparatus for cooling a sample during a room temperature fatigue test according to claim 1, wherein: the supporting component is of a cylindrical structure, and one end of the supporting component is provided with a mounting hole and is used for being connected with a fatigue testing machine; and the side wall of the supporting part, which is close to one side of the mounting hole, is also provided with an air inlet, the air inlet is connected with an air inlet pipe in the supporting part, and the air inlet pipe is communicated with the inner part of the cooling ring.
3. The apparatus for cooling a sample during a room temperature fatigue test according to claim 2, wherein: the other end of the supporting component is provided with four air outlets, the air inlet pipe comprises a main pipeline and four branch pipes branched from the main pipeline, and the four branch pipes are respectively connected with the four air outlets; compressed air generated by the compressor sequentially passes through the air inlet I, the air inlet pipe main pipeline, the air inlet pipe branch pipe and the air outlet and is input into the cooling ring.
4. The apparatus for cooling a sample during a room temperature fatigue test according to claim 2, wherein: the cooling ring is formed by assembling 4 hollow cooling bodies with the same structure, each hollow cooling body comprises a semi-annular structure and a connecting part, and three hollow shafts are arranged on the semi-annular structures; one free end of the semi-annular structure is closed, the other free end of the semi-annular structure is provided with a connecting part, and a columnar pipe is arranged on the connecting part; the cylindrical pipe and the three hollow shafts are arranged on the same side surface of the hollow cooling body.
5. The device for cooling a sample during room temperature fatigue test according to claim 4, wherein: the assembly of 4 hollow cooling bodies of the same structure of cooling ring pairwise relatively is: the semi-annular structures of the two hollow cooling bodies are oppositely arranged to be spliced into a circular ring shape, the columnar pipes on the two hollow cooling bodies respectively extend into the air outlets at the end parts of the supporting parts, and sealing rings are arranged in the air outlets so as to facilitate the columnar pipes to extend into the air outlets to form sealing structures; the semi-annular structure can rotate along the columnar pipe extending into the supporting component; after the semi-annular structures of the other two hollow cooling bodies are oppositely arranged and spliced into a circular ring, hollow shafts on the two formed circular ring structures are connected in a one-to-one mode, and the columnar pipes on the other two hollow cooling bodies also extend into the air outlet at the end part of the supporting part.
6. The device for cooling a sample during room temperature fatigue test according to claim 4, wherein: the hollow rotating shaft is provided with a longitudinal row of exhaust holes, the hollow shaft is also sleeved with a blocking piece capable of rotating, and whether the hollow shafts exhaust gas or not can be controlled through rotation of the blocking piece, so that the exhaust amount and the exhaust position of the exhaust gas of the whole device are regulated and controlled.
7. The apparatus for cooling a sample during a room temperature fatigue test according to claim 1, wherein: the supporting component and the cooling ring are formed by 3D printing of high polymer resin.
8. The apparatus for cooling a sample during a room temperature fatigue test according to claim 1, wherein: the air compressor is provided with a pressure regulating valve which can control the pressure of the supplied compressed air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010542598.2A CN111665149A (en) | 2020-06-15 | 2020-06-15 | Sample cooling device during room temperature fatigue test |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010542598.2A CN111665149A (en) | 2020-06-15 | 2020-06-15 | Sample cooling device during room temperature fatigue test |
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| CN111665149A true CN111665149A (en) | 2020-09-15 |
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| CN202010542598.2A Pending CN111665149A (en) | 2020-06-15 | 2020-06-15 | Sample cooling device during room temperature fatigue test |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113624629A (en) * | 2021-08-10 | 2021-11-09 | 中机试验装备股份有限公司 | Fatigue wear testing machine for cross axle |
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2020
- 2020-06-15 CN CN202010542598.2A patent/CN111665149A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113624629A (en) * | 2021-08-10 | 2021-11-09 | 中机试验装备股份有限公司 | Fatigue wear testing machine for cross axle |
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