Today, I will introduce a national invention authorized patent-a high-temperature thermal fatigue testing machine with controllable environmental exhaust gas. The patent was applied for by Shanghai University, and the authorization was announced on July 31, 2018.
Content descriptionThe invention relates to a fatigue testing machine, in particular to a high temperature thermal fatigue testing machine, which is applied to the technical field of thermal fatigue performance experiment of materials.
Background of the inventionThermal fatigue refers to the phenomenon that when material parts or components are repeatedly heated and cooled, due to the constraints of free expansion or contraction, the internal alternating thermal stress is generated, and the material is cracked and destroyed under the repeated action of the alternating thermal stress.
Due to the ever-increasing emissions of automobile exhaust and the world's energy shortage, automobiles have increasingly higher requirements in terms of safety, energy saving, environmental protection, lightweight, and miniaturization. Therefore, the standards for automobile exhaust emissions are also becoming higher and higher. As a result, the thermal fatigue of the high-temperature end of the automobile exhaust system is becoming more and more serious. The search for stainless steel with a higher service temperature is particularly prominent in the automobile exhaust system. Therefore, it is very necessary to carry out research on the high temperature thermal fatigue properties of related materials.
Although the phenomenon of thermal fatigue has received widespread attention, a lot of research has been done on thermal fatigue test methods at home and abroad, and some test specifications have been formulated, but so far there is no internationally recognized standard test method. In our country, there are many methods for the study of thermal fatigue, but they have not been unanimously recognized, and the evaluation of thermal fatigue performance of materials has been mainly concentrated in the aviation field for a long time, and it is rare in other industries. The situation in related fields in the world is generally the same. Therefore, there is no specific test standard for the working conditions of automobile exhaust manifold materials. Generally, the relevant reports of Japan JFE and UGINE&ALZ can be used for reference.
The actual exhaust manifold is a thin-walled pipe fitting from the structure, with more complicated forms and more bends. Analyzing the stress state from the force situation is not pure tension and compression, but includes bending components. Therefore, UGINE&ALZ uses prefabricated "V"-shaped plate-shaped specimens closer to the actual state than the round rod-shaped specimens produced by Japan's JFE Company. However, UGINE&ALZ adopts fixed clamping, and the restraint coefficient cannot be adjusted. Its restraint rate is always 1, and it does not simulate the influence of the thermal fatigue of the sample under the exhaust gas environment. Because the fuel contains impurities such as sulfur, potassium, sodium, and vanadium, The formation of gases such as SO2, SO3, H2S, V2O5, CO, and CO2 during combustion will lead to changes in fatigue life. Therefore, the high-temperature thermal fatigue experiment under simulated exhaust gas environment has important practical significance.
Summary of the inventionIn order to solve the problems of the prior art, the present invention provides a high-temperature thermal fatigue testing machine with controllable environmental exhaust gas, which has the function of a testing machine that can adjust the sample constraint coefficient and can simulate high-temperature thermal fatigue under controllable high-temperature exhaust gas. In closer proximity to the actual situation, a device that can be adjusted back and forth is used to control the constraint coefficient of the sample, and at the same time, the exhaust gas of each component is introduced, and the high-temperature thermal fatigue test is simulated through cyclic heating and cooling to meet the requirements for more accurate material performance testing. Requirements, to provide strong experimental test analysis guarantee for the design and development of structural materials and functional materials.
![[New patent introduction] High temperature thermal fatigue testing machine with controllable environmental exhaust gas](http://i.bosscdn.com/blog/pI/YB/AF/tqPUuACVy4AACvOEeWBYs544.png)
To achieve the above objectives, the present invention adopts the following technical solutions: a high temperature thermal fatigue testing machine with controllable environmental exhaust gas, which mainly includes a workbench frame, a sample fixture system, a heating control system, and a simulated exhaust gas environment system, which simulates exhaust gas The environmental system includes the exhaust gas reaction chamber, exhaust gas delivery pipe, exhaust gas source, gas heater and gas flow meter. The V-shaped sample to be tested is set in the exhaust gas reaction chamber so that the middle part of the V-shaped sample is "V"-shaped. It is completely set in the exhaust gas reaction chamber, so that the two ends of the V-shaped sample are respectively penetrated from the holes on the outer wall of the reaction chamber at both ends of the exhaust gas reaction chamber. The exhaust gas source transports the exhaust gas into the exhaust gas reaction chamber through the exhaust gas delivery pipe and passes through the main control The device controls the gas heater to heat the exhaust gas before entering the exhaust gas reaction chamber, and uses the gas flowmeter to measure the exhaust gas flow into the exhaust gas reaction chamber, so that the exhaust gas flows on the surface of the V-shaped sample, and the gas flowmeter is signaled to the main controller. , The main controller controls the flow of exhaust gas to the exhaust gas reaction chamber.
The workbench frame is equipped with a bottom plate, and a sample clamp system is set on the bottom plate. The two ends of the V-shaped sample are installed on the sample clamp. The sample clamp includes a fixed clamp part and a movable clamp part. The clamping part of the clamp is mainly composed of a sample support block and a sample fixing and compression block. The clamp fixing and clamping part is fixedly installed on the bottom plate by a screw, and the fixed end of the V-shaped sample is clamped and fixed on the bottom plate. Between the sample support block and the sample fixed compression block, the movable clamping part of the clamp is mainly composed of the sample mobile support block and the follow-up sample fixed compression block to form a dynamic clamping structure, and the sample mobile support block on the bottom plate Set at the same height as the sample support block, clamp and fix the non-fixed end of the V-shaped sample between the sample moving support block and the follow-up sample fixed compression block, and the movable clamping part of the clamp is opposite The displacement changes between the fixed and clamped parts of the fixture, apply tension or pressure to the non-fixed end of the V-shaped sample, thereby adjusting the different constraint coefficients on the V-shaped sample, and the sample moving support block follows the set trajectory of the bottom plate Make a move.
The heating control system is mainly composed of a main controller, a gas heater, a power supply, a thermocouple sensor and a temperature controller. The two ends of the V-type sample are electrically connected to the power supply by copper wires. The temperature controller and the thermocouple sensor signal Connect, the test end of the thermocouple sensor detects the temperature of the "V"-shaped part of the V-shaped sample, and senses the temperature of the V-shaped sample. The temperature controller receives the detection signal from the thermocouple sensor. After the judgment, the temperature is controlled. The instrument controls the power supply and applies a large current to the V-shaped sample through a copper wire to heat the V-shaped sample. The power supply is also equipped with a counter that records the number of heating and cooling times. It is used in the work of the sample machine for thermal fatigue experiments. The steps are controlled and set by the main controller, and the counter and the temperature controller are respectively connected with the main controller signal.
As a preferred technical solution of the present invention, the V-shaped sample is used to simulate the actual atmosphere and thermal environment by using the movable clamping part of the clamp capable of displacement adjustment to control the restraint coefficient of the V-shaped sample, and at the same time, it is added to the gas heater. The exhaust gas of each component is passed through, and the high temperature thermal fatigue test is simulated through cyclic heating and cooling. The power supply adopts a direct current heating power supply and a bypass air-cooling device is also provided. The power supply supplies power to the bypass air-cooling device. When the heat preservation step of the thermal fatigue test of the sample machine is completed, the bypass air-cooling device immediately conducts the exhaust gas reaction chamber Air cooling is used to cool down the V-shaped sample placed in the exhaust gas reaction chamber. The material of the sample support block, the sample fixed compression block, the sample moving support block and the follow-up sample fixed compression block is metallic copper, and the sample support block, the sample fixed compression block, the sample Any one or any number of modules in the moving support block and the follow-up sample fixed compression block are equipped with liquid cooling pipes, and the cooling liquid pipe is connected with the liquid cooling hole on the surface of the module to form a liquid cooling pipe to make The sample holder is used as a heat exchange device to cool the V-shaped sample held by it.
As a preferred technical solution of the present invention, a linear track or a linear guide groove is provided on the bottom plate, so that the sample moving support block moves forward and backward along the linear track of the bottom plate. As a more preferred technical solution of the present invention, at least two parallel linear thin guide rails are provided on the bottom plate, so that the sample moving support block slides linearly along the bottom plate. The exhaust gas source adopts a waste gas cylinder, and the gas collecting bottle is connected to the waste gas conveying pipe between the waste gas bottle and the waste gas reaction chamber as a waste gas heating zone device. The gas heater heats the gas collecting bottle so that the heated waste gas bottle flows through the collecting bottle. After the gas cylinder is transported to the exhaust gas reaction chamber. The bottom plate is fixed on an insulating plate with a spacer through bolts, and the insulating plate is fixed on an iron stand.
As a preferred technical solution of the present invention, a baffle is fixed on the sample moving support block, and two movable splints are fixed on the bottom plate, so that when the sample moving support block moves along the bottom plate, the baffle is always on the two blocks. Move between the movable splints to form a limit device to control the distance range of the specimen moving support block. The sample support block and the sample fixed compression block should be assisted by the stop rod and the fixed support rod. The stop rod is fixedly installed on the bottom plate, and the fixed support rod is set between the stop rod and the sample fixed compression block. The specimen is fixed by the compression block for lateral fixation.
Compared with the prior art, the present invention has the following obvious prominent substantive features and significant advantages: 1. Compared with the test device designed by UGINE&ALZ, the present invention controls the sample support block by adjusting the distance between the movable splints The moving distance of the baffle, and then change the restraint coefficient of the sample in the thermal fatigue test, and realize the study of the influence of different restraint coefficients on the thermal fatigue test; 2. The present invention uses a gas heater to heat the gas, and simulates the exhaust gas through the pipe The thermal fatigue test in the environment can explore the influence of exhaust gas on the thermal fatigue life of the sample. The environmental exhaust gas can be controlled, and it can perform a variety of high-temperature thermal fatigue tests to meet the testing of the ability of the material to serve in a variety of working conditions. The use conditions of the invention provide more evaluation methods; 3. The experimental device of the present invention has a simple structure and a reasonable design. It can realize the thermal fatigue test of the automobile at high temperature and evaluate the life of the sample. The present invention provides the sample constraint coefficient is adjustable and can be The high-temperature thermal fatigue testing machine under high-temperature exhaust gas is simulated, so that the sample is closer to the actual situation for research, so the present invention has broad application prospects in the high-temperature section thermal fatigue application field of automobiles.
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