CN110631935A - Low-temperature device of rolling contact fatigue testing machine - Google Patents
Low-temperature device of rolling contact fatigue testing machine Download PDFInfo
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- CN110631935A CN110631935A CN201910897254.0A CN201910897254A CN110631935A CN 110631935 A CN110631935 A CN 110631935A CN 201910897254 A CN201910897254 A CN 201910897254A CN 110631935 A CN110631935 A CN 110631935A
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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
- G01N3/34—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by mechanical means, e.g. hammer blows
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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
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
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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
- G01N2203/003—Generation of the force
- G01N2203/0032—Generation of the force using mechanical 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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- 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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Abstract
The invention belongs to the technical field of rolling contact fatigue test equipment, and discloses a low-temperature device of a rolling contact fatigue tester.A computer is connected with a data acquisition unit through a second data line, and the data acquisition unit is connected with a temperature sensor in a low-temperature air chamber through a first data line; the low-temperature air chamber is connected with a gas-liquid separator through a mixed oil-gas pipe, and the lower end of the gas-liquid separator is provided with an oil outlet pipe; the gas-liquid separator is connected with a refrigerating device through a normal temperature gas pipe, and the refrigerating device is provided with a water inlet pipe and a water outlet pipe; the low-temperature air chamber is connected with the refrigerating device through a low-temperature gas pipe, and the computer is connected with the refrigerating device through a third data line. The invention maximally makes the test environment close to the actual low-temperature environment, can be used for testing rolling contact fatigue samples at different temperatures, and has important practical significance for researching the contact fatigue performance of the bearing steel in the low-temperature environment.
Description
Technical Field
The invention belongs to the technical field of rolling contact fatigue test equipment, and particularly relates to a low-temperature device of a rolling contact fatigue test machine.
Background
As industries develop and economies expand, governments invest heavily in support of industrialization and economic diversification, and thus a batch of technology and equipment has emerged to support the development of the economic society, however, these heavy machines are subjected to severe service environments when they are put into use in different areas. For example, chinese high-speed rail and wind power generators are used in high-altitude areas. The heavy machinery has a plurality of problems in the operation process, the mechanical property, the brittleness and the toughness of the material at low temperature can be seriously changed, and the change of the metal material can bring great hidden trouble to the safe operation of mechanical equipment. The performance of mechanical parts is greatly influenced by temperature, and the low-temperature environment in high-latitude areas becomes an important factor influencing the fatigue life of bearings of gear boxes of high-speed locomotives and fans. The performance of parts such as bearings directly influences the driving safety of the train and the normal operation of the fan. Practice proves that the failure mechanism of the bearing at low temperature is different from that of a normal temperature environment, and the contact fatigue performance of the bearing is far lower than that of the bearing at room temperature. The existing contact fatigue test can only be carried out in a room temperature environment, and has a great difference with the actual running environment of the wind driven generator in a high latitude area. At present, no technology exists at home and abroad, which can be used for carrying out a rolling contact fatigue test at low temperature to research the contact fatigue performance of the material at low temperature. Therefore, the research on the contact fatigue performance of the bearing steel in a low-temperature environment has important practical significance.
In summary, the problems of the prior art are as follows:
(1) scientists fill liquid nitrogen into the device to achieve the cooling purpose, but the method has certain defects, the liquid nitrogen refrigeration can only regulate and control the ambient temperature by controlling the flow of the liquid nitrogen, and the low-temperature environment cannot be accurately controlled and maintained. In addition, the lubricating oil is easy to freeze and solidify due to the excessively high cooling speed of the liquid nitrogen, and the performances of other parts of the test equipment are also reduced. Secondly, the contact fatigue test period is long, a large amount of liquid nitrogen is needed to maintain the low-temperature environment, and special persons are needed to take care of the low-temperature environment, so that the test cost is increased.
(2) When the testing machine works, the ambient environment is accompanied by the temperature rise of the sample, and how to create a closed and constant low-temperature environment is difficult. The research on the fatigue performance of the material in a low-temperature environment also needs a large amount of test verification for a long time.
(3) When bearing parts are operated, lubricating oil is required to be continuously supplied to prevent excessive wear, and the lubricating oil is easy to solidify at low temperature and loses its lubricating performance, so that the problem of lubricating oil solidification must be solved.
(4) Some low temperature tests are performed in outdoor low temperature environments and are limited by site and time.
The difficulty and significance for solving the technical problems are as follows:
whether heavy mechanical equipment such as bearings and high-speed rails can safely and stably operate is closely related to the performance of the material. And external factors affecting the material properties include vibration, temperature, and the like. Fatigue of materials under dynamic loading necessarily produces vibration, and this problem has been well solved. Another difficulty is creating a low temperature environment, and due to the limitations of experimental conditions, the fatigue performance of the material in the low temperature environment is not well known. One of the difficulties in providing a cryogenic device on a dynamic testing apparatus is that the cryogenic device is not well fixed and sealed on the dynamic testing machine.
The performance of the material is inevitably changed under the condition of low temperature, and the low temperature has adverse effect on almost all product materials. Firstly, the bearing material of the fan gearbox is hardened and embrittled in a low-temperature environment, so that the bearing or wheel rail of a high-speed train is easily brittle and broken, and the safe operation of the train is influenced. Secondly, the breadth of China is broad, the temperature difference is large in different latitude areas, and in response to temperature transient, due to the fact that different parts and components are different in expansion rate, different materials contract and expand to different degrees, and loosening and seizure are easily caused among the parts and components; third, the low temperature increases the viscosity of the lubricating oil, resulting in a reduction in the lubricating effect and fluidity of the lubricating oil. Fourthly, because the impact strength of the material is changed and the fatigue strength is reduced, the bearing or the wheel rail contact surface is easy to peel, crack and brittle fracture;
wind power generators and trains operating in different latitudes face working environments with different temperatures. The research on the contact fatigue performance of the bearing material and the wheel rail material in the low-temperature environment can provide a reference basis for the heat treatment process of the improved material and provide accurate data for predicting the fatigue life of the material. The size and operating environment of the bearing type parts are designed to extend the service life of the bearing and the wheel rail. Powerful guarantee is provided for stable operation of the wind driven generator and safe operation of the train, and important economic benefits and social benefits are achieved.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a low-temperature device of a rolling contact fatigue testing machine. The low-temperature device overcomes the defect that the existing rolling contact fatigue testing machine cannot test the low-temperature contact fatigue performance of the material, and can meet the requirements of the low-temperature contact fatigue test.
The invention is realized in such a way that a low-temperature device of a rolling contact fatigue testing machine is provided with:
the computer is connected with the data acquisition unit through a second data line, and the data acquisition unit is connected with the temperature sensor in the low-temperature air chamber through a first data line; the low-temperature air chamber is connected with a gas-liquid separator through a mixed oil-gas pipe, and the lower end of the gas-liquid separator is provided with an oil outlet pipe;
the gas-liquid separator is connected with a refrigerating device through a normal temperature gas pipe, and the refrigerating device is provided with a water inlet pipe and a water outlet pipe; the low-temperature air chamber is connected with the refrigerating device through a low-temperature gas pipe, and the computer is connected with the refrigerating device through a third data line.
Furthermore, the right end of the refrigerating device is fixedly provided with a control panel through a bolt, and a display screen and an operation key are embedded on the control panel.
Furthermore, the refrigerating device is provided with an upper part and a lower part, the upper left corner of the lower part is provided with a water filling port, the lower right corner is provided with a water outlet, and the lower part is provided with a condenser; the upper part is provided with an evaporator and a blower, and a normal temperature gas pipe is connected with an expansion valve; the expansion valve is connected with the condenser, and the condenser is connected with the compressor; the compressor is connected with the evaporator, the evaporator is connected with the blower, and the blower is connected with the low-temperature gas pipe.
Further, the low-temperature air chamber is provided with an upper part and a lower part, the upper end of the low-temperature air chamber is provided with a magnet and a sealing strip, and the lower end of the low-temperature air chamber is provided with an air exhaust opening.
Furthermore, the low-temperature air chamber is provided with a cold air chamber, and the cold air chamber is provided with four cold air inlets; the middle of the low-temperature air chamber is provided with a lubricating oil inlet, and the inner side of the low-temperature air chamber is uniformly provided with anti-suck-back spray heads.
Further, the anti-suck-back nozzle is provided with an anti-suck-back cavity, the left end of the anti-suck-back cavity is provided with an air nozzle, the right end of the anti-suck-back cavity is provided with an air inlet pipe, and a filtrate hole is formed in the anti-suck-back cavity.
In summary, the advantages and positive effects of the invention are:
the invention is not only applied to a contact fatigue testing machine, but also can be applied to different material dynamic testing machines by designing different heat insulation layers.
The temperature control of the invention is flexible, different temperatures can be adjusted by controlling the switch, and the contact fatigue test can be carried out in different temperature environments.
The device provided by the invention contains the heat insulation layer, so that the environmental temperature in the sample bin and around the sample is only reduced, and other parts of the test device cannot be influenced.
The closed loop system of the invention: the computer can monitor the temperature in the low-temperature air chamber in real time and can adjust the working state of the refrigerating system, and the whole system forms a closed loop.
Drawings
FIG. 1 is a schematic view of the overall structure of a low-temperature device of a rolling contact fatigue testing machine provided by an embodiment of the invention;
FIG. 2 is a schematic view of the refrigeration unit shown in FIG. 1 provided by an embodiment of the present invention;
FIG. 3 is a schematic view of the cryogenic gas cell shown in FIG. 1 provided by an embodiment of the present invention;
FIG. 4 is a schematic view of the anti-back-up nozzle of FIG. 3 according to an embodiment of the present invention;
FIG. 5 is an assembly view of a contact fatigue test specimen and apparatus provided by an embodiment of the present invention;
in the figure: 1. a water inlet pipe; 2. a refrigeration device; 3. a low temperature gas chamber; 4. a data acquisition unit; 5. a computer; 6. a gas-liquid separator; 7. a mixed oil gas pipe; 8. a normal temperature gas pipe; 9. a low temperature gas pipe; 10. a first data line; 11. a second data line; 12. a third data line; 13. an oil outlet pipe; 14. a water outlet pipe; 21. a compressor; 22. a water injection port; 23. an expansion valve; 24. a condenser; 25. a water outlet; 26. a control panel; 27. an evaporator; 28. a blower; 261. a display screen; 262. an operation key; 31. a cold air inlet; 32. a lubricant inlet; 33. the anti-suck-back spray head; 34. a temperature sensor; 35. a cold air chamber; 36. a magnet; 37. a sealing strip; 38. an air extraction opening; 331. an air jet; 332. a suck-back prevention cavity; 333. an air inlet pipe; 334. a filtrate well; 51. a lower liquid storage tank; 52. a cold air chamber; 53. contacting the lower sample; 54. a sealing cover is arranged on the liquid storage tank; 55. the sample was contacted.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following detailed description of the principles of the invention is provided in connection with the accompanying drawings.
According to the embodiment of the invention, the low-temperature device of the rolling contact fatigue testing machine is provided with a control system A and a control system B;
the control system a includes: the computer 5, the data acquisition unit 4 and the second data line 11;
the control system B includes: the device comprises a water inlet pipe 1, a refrigerating device 2, a low-temperature air chamber 3, a gas-liquid separator 6, a mixed oil-gas pipe 7, a normal-temperature gas pipe 8, a low-temperature gas pipe 9, an oil outlet pipe 13 and a water outlet pipe 14.
The refrigeration apparatus 2 includes: a compressor 21, a water filling port 22, an expansion valve 23, a condenser 24, a water outlet 25, a control panel 26, an evaporator 27, a blower 28, a display 261, and an operation key 262;
the low-temperature gas chamber 3 includes: the device comprises a cold air inlet 31, a lubricating oil inlet 32, an anti-suck-back spray head 33, a temperature sensor 34, a cold air cavity 35, a magnet 36, a sealing strip 37, an air suction port 38, an air jet port 331, an anti-suck-back cavity 332, an air inlet pipe 333 and a filtrate hole 334.
The computer 5 is connected with the data acquisition unit 4 through a second data line 11, and the data acquisition unit 4 is connected with a temperature sensor 34 in the low-temperature air chamber 3 through a first data line 10; the low-temperature air chamber 3 is connected with a gas-liquid separator 6 through a mixed oil-gas pipe 7, and an oil outlet pipe 13 is arranged at the lower end of the gas-liquid separator 6.
The gas-liquid separator 6 is connected with the refrigerating device 2 through a normal temperature gas pipe 8, and the refrigerating device 2 is provided with a water inlet pipe 1 and a water outlet pipe 14; the low-temperature air chamber 3 is connected with the refrigerating device 2 through a low-temperature gas pipe 9, and the computer 5 is connected with the refrigerating device 2 through a third data line 12.
A control panel 26 is fixed to the right end of the refrigeration apparatus 2 by bolts, and a display 261 and operation keys 262 are fitted to the control panel 26.
The refrigerating device 2 is provided with an upper part and a lower part, wherein the upper left corner of the lower part is provided with a water filling port 22, the lower right corner is provided with a water outlet 25, and the lower part is provided with a condenser 24.
The upper part is provided with an evaporator 27 and a blower 28, and the normal temperature gas pipe 8 is connected with an expansion valve 23; the expansion valve 23 is connected to the condenser 24, and the condenser 24 is connected to the compressor 21; the compressor 21 is connected to the evaporator 27, the evaporator 27 is connected to the blower 28, and the blower 28 is connected to the low-temperature gas pipe 9.
The low-temperature air chamber 3 is provided with an upper part and a lower part, and the upper end of the low-temperature air chamber 3 is provided with a magnet 36 and a sealing strip 37; the lower end of the low-temperature air chamber is provided with an air exhaust port.
The low-temperature air chamber 3 is provided with a cold air chamber 35, and the cold air chamber 35 is provided with four cold air inlets 31; the middle of the low-temperature air chamber 3 is provided with a lubricating oil inlet 32, and the inner side of the low-temperature air chamber 3 is uniformly provided with anti-suck-back spray heads 33.
The anti-suck-back nozzle is provided with an anti-suck-back cavity 332, the left end of the anti-suck-back cavity 332 is provided with an air nozzle 331, the right end of the anti-suck-back cavity 332 is provided with an air inlet pipe 333, and a filtrate hole 334 is formed inside the anti-suck-back cavity 332.
The technical solution of the present invention is further described with reference to the following specific examples.
The refrigerating device comprises a compressor 21, a circulating water filling port 22, an expansion valve 23, a condenser 24, a circulating water outlet 25, a control panel 26, an evaporator 27 and a blower 28, the circulating water absorbs heat emitted by the condenser 24, the heat dissipation is more efficient than that of the traditional air, normal temperature gas enters the refrigerating device through a pipeline 8, is changed into low temperature gas through the evaporator 27 and then is sent to a low temperature air chamber through the blower.
The low-temperature air chamber comprises a cold air inlet 31, a lubricating oil inlet 32, an anti-suck-back spray nozzle 33, a temperature sensor 34, a cold air cavity 35, a magnet 36, a sealing strip 37 and an air suction opening 38. The magnet and the sealing strip are used for butting and sealing the two parts of the low-temperature gas chamber. Lubricating oil enters the contact part of the two samples to lubricate, and the cold air nozzles are uniformly distributed in the air chamber, so that the temperature can be uniformly distributed in the air chamber to form a low-temperature environment. The cold air nozzle adopts the anti-suck-back design, thereby preventing the nozzle from being blocked by lubricating oil to influence the refrigeration effect. The low-temperature air chamber adopts heat insulation materials to prevent the mutual exchange of indoor heat and outdoor heat, the temperature sensor is arranged in the low-temperature air chamber to detect the indoor real-time temperature, and the preset temperature of the low-temperature system is between 10 ℃ below zero and 0 ℃.
The anti-suck-back nozzle comprises an air nozzle 331, an anti-suck-back cavity 332, an air inlet pipe 333 and a filtrate hole 334. In the test process, lubricating oil in the air chamber splashes due to the rapid rotation of the test, and if the lubricating oil permeates into the spray head, the lubricating oil can be discharged from a filtrate hole in the air jet.
The low-temperature device is convenient to install, the control system A is composed of a computer 5, a data collector 4 and a data transmission line 10, the data collector 4 mainly collects data of a temperature sensor 34 in the low-temperature air chamber, the data are processed and converted and then transmitted to the computer, finally the data are displayed through computer software, the computer system feeds information back to the refrigerating device 2 of the working system B, the refrigerating device 2 automatically adjusts the temperature to a set temperature after receiving signals, and therefore a closed-loop control system is formed. The low temperature gas chamber 3 is provided with a temperature sensor 34 for measuring the temperature in the chamber.
The refrigeration device comprises three major components, a compressor 21, an expansion valve 23, a condenser 24 and a control panel 26. The refrigerating device 2 adopts a safe and environment-friendly R-134a refrigerant, after the refrigerant in a low-pressure steam state enters the compressor 21, the compressor 21 compresses low-pressure steam into high-pressure liquid and then discharges the high-pressure liquid to the evaporator 27, and air circularly flowing in the low-temperature air chamber 2 is contacted with the evaporator 27 to absorb heat of the air so as to achieve the purpose of cooling. The refrigerant is heated and changed into a gaseous state at this time, and is transmitted to the condenser 24 through the expansion valve 23, and the condenser 24 discharges heat into the circulating water. The low-temperature air enters the low-temperature air chamber 3 under the blowing of the fan.
In the low-temperature air chamber 3, low-temperature air enters from the four cold air inlets 31 and is filled in the cold air chamber 35, the anti-suck-back nozzles 33 are uniformly distributed on the inner wall of the cold air chamber 35, and the low-temperature air is uniformly sprayed to each part in the air chamber through the anti-suck-back nozzles 33, so that the temperature around the sample is uniformly distributed. The chamber is divided into two parts and sealed by a top magnet 36 and a sealing strip 37 to prevent low temperature gas emission. The lubricating oil is introduced from the lubricating oil inlet 32 and sprayed between the two contact samples to play a lubricating role. The bottom of the air chamber is provided with an air pumping hole 38, the mixture of lubricating oil and gas is pumped into the gas-liquid separation device 6 to separate the oil-gas mixture, the normal temperature gas is sent to the refrigerating device 2 through the guide pipe 8 to be refrigerated and cooled, and the lubricating oil is led out to the oil storage tank through the oil outlet pipe 13 to be recycled.
The suck-back prevention nozzle 33 on the inner wall of the low-temperature air chamber mainly prevents lubricating oil from sucking back to block the air nozzle, the nozzle comprises an oval suck-back prevention cavity 332, and filtrate holes 334 are distributed on the cavity wall and can be filtered out by the filtrate holes once the lubricating oil enters.
During assembly, the upper contact fatigue test specimen 55 and the lower contact fatigue test specimen 53 should be installed correctly first, then the cold air chamber 52 should be installed and sealed, and finally the refrigerating device should be operated. The reservoir 51 and the seal cover 54 function to recover the overflowed lubricating oil.
Preferably, the temperature of the device is preset between-10 ℃ and 0 ℃.
Preferably, the data collector collects and processes the temperature sensor signal, and then transmits the temperature sensor signal to the computer, and the computer displays the temperature information.
Preferably, the computer transmits a signal to the refrigeration system that will adjust the operating intensity of the refrigeration device based on the set temperature.
Preferably, the refrigerant in the refrigeration apparatus is an environmentally safe R-134a refrigerant.
Preferably, the compressor compresses the refrigerant into a high pressure liquid, which is delivered to the evaporator, where the refrigerant expands to absorb heat and reduce the temperature of the ambient air. The refrigerant is changed into low-pressure high-temperature gas, the low-pressure high-temperature gas reaches the condenser through the expansion valve, and the heat of the high-temperature gas is transmitted to the circulating water, so that the purpose of high-efficiency refrigeration is achieved.
Preferably, after the normal temperature gas enters the refrigeration apparatus, heat is absorbed by the refrigerant in the evaporator to become a low temperature gas, and the low temperature gas is sent to the low temperature gas chamber by the blower.
Preferably, the refrigerating device is controlled by a control panel, and can display refrigerating temperature and adjust the temperature.
Preferably, the low-temperature air chamber is formed by tightly combining two parts, is used by matching with a contact fatigue testing machine, and is convenient to mount and dismount.
Preferably, the temperature around the sample is reduced by uniformly surrounding the sample with the shower head after the low-temperature gas enters the cold gas chamber.
Preferably, the mixture of the lubricating oil and the air is discharged from the air suction port and discharged to the gas-liquid separator, and the air and the lubricating oil are separated and recycled.
Preferably, the cold air nozzle adopts a reverse suction prevention design, and once lubricating oil enters the blocked nozzle, the lubricating oil is discharged from the filtrate hole.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. The utility model provides a rolling contact fatigue testing machine low temperature equipment which characterized in that, rolling contact fatigue testing machine low temperature equipment is provided with:
the computer is connected with the data acquisition unit through a second data line, and the data acquisition unit is connected with the temperature sensor in the low-temperature air chamber through a first data line; the low-temperature air chamber is connected with a gas-liquid separator through a mixed oil-gas pipe, and the lower end of the gas-liquid separator is provided with an oil outlet pipe;
the gas-liquid separator is connected with a refrigerating device through a normal temperature gas pipe, and the refrigerating device is provided with a water inlet pipe and a water outlet pipe; the low-temperature air chamber is connected with the refrigerating device through a low-temperature gas pipe, and the computer is connected with the refrigerating device through a third data line.
2. The low-temperature device for the rolling contact fatigue testing machine according to claim 1, wherein a control panel is fixed at the right end of the refrigerating device through a bolt, and a display screen and an operation key are embedded on the control panel.
3. The low-temperature device for the rolling contact fatigue testing machine according to claim 1, wherein the refrigerating device is provided with an upper part and a lower part, the upper left corner of the lower part is provided with a water filling port, the lower right corner is provided with a water outlet, and the lower part is provided with a condenser; the upper part is provided with an evaporator and a blower, and a normal temperature gas pipe is connected with an expansion valve; the expansion valve is connected with the condenser, and the condenser is connected with the compressor; the compressor is connected with the evaporator, the evaporator is connected with the blower, and the blower is connected with the low-temperature gas pipe.
4. The low-temperature device for the rolling contact fatigue testing machine according to claim 1, wherein the low-temperature air chamber is provided with an upper part and a lower part, a magnet and a sealing strip are arranged at the upper end of the low-temperature air chamber, and an air suction opening is arranged at the lower end of the low-temperature air chamber.
5. The low-temperature device for the rolling contact fatigue testing machine according to claim 1, wherein the low-temperature air chamber is provided with a cold air chamber, and the cold air chamber is provided with four cold air inlets; the middle of the low-temperature air chamber is provided with a lubricating oil inlet, and the inner side of the low-temperature air chamber is uniformly provided with anti-suck-back spray heads.
6. The low-temperature device for the rolling contact fatigue testing machine according to claim 1, wherein the anti-suck-back nozzle is provided with an anti-suck-back cavity, the left end of the anti-suck-back cavity is provided with an air nozzle, the right end of the anti-suck-back cavity is provided with an air inlet pipe, and a filtrate hole is formed in the anti-suck-back cavity.
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| CN201910897254.0A CN110631935A (en) | 2019-09-23 | 2019-09-23 | Low-temperature device of rolling contact fatigue testing machine |
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| CN201910897254.0A CN110631935A (en) | 2019-09-23 | 2019-09-23 | Low-temperature device of rolling contact fatigue testing machine |
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