Engine piston thermal fatigue test device and method

Abstract

The present invention relates to the field of thermal fatigue test technology, and in particular to an engine piston thermal fatigue test device and method thereof. The engine piston thermal fatigue test device designed by the present invention comprises an engine piston, a test bench, a cooling system and a heating system. The engine piston comprises a combustion chamber throat, a piston valve pit and a piston combustion chamber. The heating system is a flame heating system. The flame heating system comprises a liquefied gas stove and a fire cover covering the combustion port of the liquefied gas stove. The fire cover is in the shape of a disc. The fire cover is evenly arranged with first combustion holes on the circumference corresponding to the combustion chamber throat; the fire cover is opened with second combustion holes on the circumference corresponding to the bottom of the piston valve pit; the fire cover is opened with third combustion holes on the circumference corresponding to the top of the piston valve pit; and the fire cover is evenly opened with fourth combustion holes on the circumference of the bottom of the piston combustion chamber. The engine piston thermal fatigue test device of the present invention can accurately simulate the temperature field of the piston by designing the size, number and density of the combustion holes on the fire cover.

Description

Technical Field

[0001] The invention relates to the technical field of thermal fatigue testing, and in particular to a thermal fatigue testing device and method for an engine piston. Background Art

[0002] At present, the load on engine pistons has increased dramatically, and their thermal fatigue characteristics have received widespread attention. The traditional method to assess the thermal fatigue characteristics of engine pistons is the engine thermal shock bench test. The thermal shock bench test is a reliability test that determines the performance of the entire engine. However, the thermal shock bench test cannot measure the extreme performance of a single engine part (such as the engine piston).

[0003] For individual parts, such as cylinder heads, pistons, valve tappets, etc., accelerated thermal fatigue tests are generally used at present. Accelerated thermal fatigue tests can compare and determine the thermal fatigue performance limits and reliability of engine heated parts. It is a reliable, fast and energy-saving single product test method for engine heated parts. Accelerated thermal fatigue tests are completed in a short time by simulating the thermal state of the heated parts and strengthening the test conditions. However, the temperature field of the current accelerated thermal fatigue tests generally has the defect of inaccurate temperature simulation, especially for engine pistons. When the engine piston is working, the entire top is in a high temperature state, and due to the effect of high-temperature alternating combustion gas, the temperature of each part is not the same, forming Figure 1 The temperature field shown in the figure has a temperature gradient that causes thermal stress and thermal deformation inside the piston, which is the main reason for the thermal fatigue failure of the piston. Therefore, whether the temperature field of the piston can be accurately simulated is the key to measuring the accuracy of the thermal fatigue test results. Summary of the invention

[0004] In order to solve the above problems, an object of the present invention is to provide an engine piston thermal fatigue test device and method thereof, which can accurately simulate the temperature field of the piston.

[0005] To achieve the above-mentioned purpose, the engine piston thermal fatigue test device designed by the present invention comprises an engine piston, a test bench, a cooling system and a heating system, wherein the engine piston comprises a combustion chamber throat, a piston valve pit and a piston combustion chamber, and is characterized in that the heating system is a flame heating system, and the flame heating system comprises a liquefied gas stove and a fire cover covering the combustion port of the liquefied gas stove, the fire cover is in the shape of a disc, and 9 to 12 first combustion holes are evenly arranged on the circumference of the fire cover corresponding to the throat of the combustion chamber, and the diameter of each first combustion hole is 4 to 5 mm; the fire cover is arranged at the bottom of the piston valve pit There are 15 to 18 second combustion holes on the circumference corresponding to the top of the piston valve pit, the diameter of each second combustion hole is 1 to 2 mm, and the number of second combustion holes directly opposite to the piston valve pit accounts for 2 / 3 of the total number of second combustion holes; there are 8 to 10 third combustion holes on the fire cover corresponding to the top of the piston valve pit, the diameter of each third combustion hole is 2 to 3 mm, and the number of third combustion holes directly opposite to the piston valve pit accounts for 2 / 3 of the total number of third combustion holes; there are 4 to 6 fourth combustion holes evenly arranged on the fire cover and the circumference of the bottom of the piston combustion chamber, and the diameter of each fourth combustion hole is 2 to 3 mm.

[0006] As a preferred embodiment, a temperature measuring hole is provided in the center of the piston combustion chamber of the engine piston, four temperature measuring holes are provided at the throat of the combustion chamber, four temperature measuring holes are provided at the bottom of the piston valve pit, and four temperature measuring holes are provided on the top surface of the piston, and a thermocouple is installed in each temperature measuring hole.

[0007] As a preferred embodiment, the four temperature measuring holes provided at the throat of the combustion chamber are respectively a first temperature measuring hole, a second temperature measuring hole, a third temperature measuring hole and a fourth temperature measuring hole, the first temperature measuring hole, the second temperature measuring hole, the third temperature measuring hole and the fourth temperature measuring hole are evenly distributed on the side wall of the engine piston, and the first temperature measuring hole, the second temperature measuring hole, the third temperature measuring hole and the fourth temperature measuring hole extend from the side wall of the engine piston in a horizontal direction to the throat of the combustion chamber, respectively, and the hole diameters are all 1 to 2 mm, and the distance between the hole end face close to the throat of the combustion chamber and the throat of the combustion chamber is 3 to 5 mm.

[0008] As a preferred embodiment, it also includes a swinging device, which includes a cylinder, a bracket and a supporting plate. One end of the bracket is movably connected to the telescopic rod of the cylinder, the fixed end of the cylinder is hinged to the test bench, the middle part of the bracket is rotatably connected to the test bench through a supporting shaft, and the other end of the bracket is fixed with a supporting plate for placing the engine piston, and the supporting plate is provided with a through hole for the top surface of the engine piston to extend out.

[0009] As a preferred solution, the supporting plates are provided with two pieces, namely a first supporting plate and a second supporting plate, the first supporting plate and the second supporting plate are respectively arranged on both sides of the bracket, and the cooling system includes two water spraying stations, which are respectively arranged on both sides of the liquefied gas stove.

[0010] As a preferred solution, two water troughs are installed on the test bench, and the two water spraying platforms are respectively installed in the two water troughs.

[0011] As a preferred solution, it also includes a control system, which includes the cylinder (510), the thermocouple, and a single-chip microcomputer, wherein the signal input end of the single-chip microcomputer is connected to the thermocouple, and the signal output end of the single-chip microcomputer is connected to the cylinder.

[0012] A method for thermal fatigue testing of an engine piston, characterized by comprising the steps of:

[0013] a) Temperature measuring holes are provided on the engine piston. The distribution of the temperature measuring holes is as follows: one temperature measuring hole is provided at the center of the combustion chamber of the engine piston, four temperature measuring holes are provided on the throat of the combustion chamber, four temperature measuring holes are provided at the bottom of the piston valve pit, and four temperature measuring holes are provided on the top surface of the engine piston. A thermocouple is installed corresponding to each temperature measuring hole;

[0014] b) The heating method adopts flame heating, and a combustion hole is opened on the fire cover of the liquefied fuel stove. The specific method of opening the combustion holes is as follows: 9 to 12 first combustion holes are evenly arranged on the circumference of the fire cover corresponding to the throat of the combustion chamber, and the diameter of each first combustion hole is 4 to 5 mm; 15 to 18 second combustion holes are opened on the fire cover on the circumference corresponding to the bottom of the piston valve pit, and the diameter of each second combustion hole is 1 to 2 mm, and the number of second combustion holes directly facing the piston valve pit accounts for 2 / 3 of the total number of second combustion holes; 8 to 10 third combustion holes are opened on the fire cover on the circumference corresponding to the top of the piston valve pit, and the diameter of each third combustion hole is 2 to 3 mm, and the number of third combustion holes directly facing the piston valve pit accounts for 1 / 3 of the total number of third combustion holes; 4 to 6 fourth combustion holes are evenly opened on the fire cover on the circumference of the bottom of the piston combustion chamber, and the diameter of each fourth combustion hole is 2 to 3 mm;

[0015] c) Place the top of the engine piston on a liquefied gas stove to heat it, and align the center of the combustion chamber of the engine piston with the center of the fire cover;

[0016] d) When the temperature of the throat of the engine piston reaches a preset high temperature, the engine piston is cooled by water cooling until it reaches a preset low temperature, and then the heating is repeated. This cycle is repeated until cracks appear in the engine piston. One heating process and one cooling process are considered a thermal fatigue cycle. The number of thermal fatigue cycles is counted and the thermal fatigue life of the piston is determined based on the number of thermal fatigue cycles.

[0017] As a preferred embodiment, the method for opening a temperature measuring hole on the throat of the combustion chamber is to drill a hole horizontally from the side wall of the engine piston to the throat, and the distance between the end face of the temperature measuring hole close to the throat and the throat is 3 to 5 mm, and the aperture of the temperature measuring hole is 1 to 2 mm.

[0018] The advantages of the present invention are as follows: compared with the existing engine piston thermal fatigue test device, the engine piston thermal fatigue test device of the present invention can accurately simulate the temperature field of the piston by designing the size, number and density of the combustion holes on the fire cover, and by laying out the entire engine piston thermal fatigue test device, fatigue tests can be performed on two engine pistons at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the temperature field diagram when the engine piston is working;

[0020] Figure 2 It is a structural schematic diagram of the engine piston thermal fatigue test device of the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of the fire cover;

[0022] Figure 4 This is a schematic diagram of a structure in which a temperature measuring hole is provided on the throat of the combustion chamber of an engine piston;

[0023] Figure 5 This is the layout diagram of the engine piston temperature measurement holes;

[0024] Component numbers in the figure are as follows: engine piston 100, first engine piston 100A, second engine piston 100B, combustion chamber throat 110, first temperature measuring hole f, second temperature measuring hole g, third temperature measuring hole h, fourth temperature measuring hole i, piston valve pit 120, piston combustion chamber 130, test bench 200, water trough 210, cooling system 300, water spraying platform 310, flame heating system 400, liquefied gas stove 410, fire cover 420, first combustion hole 421, second combustion hole 422, third combustion hole 423, fourth combustion hole 424, swing device 500, cylinder 510, bracket 520, supporting plate 530, support shaft 540, first supporting plate 531, second supporting plate 532, through hole 533. DETAILED DESCRIPTION

[0025] In order to better understand the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific examples.

[0026] See also Figure 2 The engine piston thermal fatigue test device of this embodiment includes a first engine piston 100A and a second engine piston 100B, a test bench 200, a cooling system 300, a flame heating system 400, and a swing device 500.

[0027] The swing device 500 includes a cylinder 510, a bracket 520 and a bracket 530. A connecting rod pointing vertically downward is fixed to the bottom surface of one end of the bracket 520. The cylinder 510 is placed horizontally. The fixed end of the cylinder 510 is hinged to the test bench 200. A circular hole is opened at the free telescopic end of the telescopic rod of the cylinder 510. The telescopic rod of the cylinder 510 is sleeved on the connecting rod through the circular hole to realize the movable connection between the telescopic rod of the cylinder 510 and one end of the bracket 520. A supporting shaft sleeve is fixed to the middle of the bracket 520. The test bench 200 is provided with a plurality of support rods. A support shaft 540 is fixed on 00, and the support shaft sleeve of the bracket 520 is sleeved on the support shaft 540 to realize the rotation of the bracket 520 around the support shaft 540; supporting plates 530 are welded and fixed on both sides of the other end of the bracket 520, which are a first supporting plate 531 and a second supporting plate 532 respectively, and the first supporting plate 531 is provided with a through hole 533 for the top surface of the first engine piston 100A to extend out, and the second supporting plate 532 is provided with a through hole 533 for the top surface of the second engine piston 100B to extend out.

[0028] Combination Figure 2 As shown, the cylinder 510 is arranged on the left side of the test bench 200, and three independent control rooms are arranged on the right side of the test bench 200 from top to bottom, which are the first water-cooling room, the heating room, and the second water-cooling room from top to bottom. A water spraying station 310 is installed in the first water-cooling room, and baffles are installed around the water sprayer to form a water collection tank 210 to prevent water from overflowing. A water spraying station 310 is installed in the second water-cooling room, and baffles are installed around the water sprayer 310 to form a water collection tank 210 to prevent water from overflowing. A liquefied gas stove 410 is installed in the heating room.

[0029] The cooling system 300 includes two water spraying stations 310, a water delivery pipe, a pressurizer, and cooling water. The cooling water is pressurized and then delivered to the water spraying stations 310 through the water delivery pipes. The water spraying stations have the same structure and size. Their bottom surfaces are connected to the water delivery pipes, and their top surfaces are provided with a plurality of holes. The cooling water is evenly sprayed onto the engine piston 100 through the holes to achieve rapid cooling.

[0030] The flame heating system 400 includes a liquefied gas stove 410 and a fire cover 420. Figure 3As shown, the fire cover 420 is in the shape of a disk, and a combustion hole is opened on the fire cover 420. The center of the fire cover 420 corresponds to the center of the engine piston 100. Ten first combustion holes 421 are evenly arranged on the circumference of the fire cover 420 corresponding to the position of the combustion chamber throat 110. The diameter of each first combustion hole 421 is 4 mm. Eighteen second combustion holes 422 are arranged on the circumference of the fire cover 420 corresponding to the bottom of the piston valve pit 120 (the depth of the piston valve pit at different positions is different, and the position with the largest valve pit depth is the bottom of the valve pit). The diameter of each second combustion hole 422 is 2 mm. The second combustion holes 422 are arranged unevenly, with 12 second combustion holes 422 falling inside the valve pit and 6 second combustion holes falling outside the piston valve pit 120. Nine third combustion holes 423 are arranged on the circumference of the fire cover corresponding to the top of the piston valve pit 120 (the position with the smallest valve pit depth is the top of the valve pit), and each third combustion hole 423 is 3 mm. The third combustion holes 423 are also arranged unevenly, with 3 third combustion holes 423 falling inside the piston valve pit 120 and 6 third combustion holes 423 falling outside the piston valve pit 120. Six fourth combustion holes 424 are evenly arranged on the circumference of the fire cover 420 corresponding to the bottom of the piston combustion chamber 130, and the diameter of each fourth combustion hole 424 is 3 mm. Since the highest temperature of the piston is at the throat position when working, the combustion holes arranged here have a larger diameter of 4mm and a larger number, with 10 holes evenly distributed around the circumference; the temperature at the piston valve pit position is second highest, and there are height changes at different positions, so the combustion holes are arranged in two circles (one circle corresponding to the bottom of the valve pit and one circle corresponding to the top of the valve pit), and cannot be evenly distributed. There are more holes at the valve pit position, and the diameters of the two circles of combustion holes are 2mm and 3mm respectively. The temperature at the bottom of the combustion chamber is the lowest, so there are the fewest combustion holes and the diameters are also small.

[0031] In addition, combined Figure 5 As shown, 17 temperature measuring points are arranged on the piston. The detailed arrangement of the 17 temperature measuring points is as follows: a temperature measuring point a is set in the center of the combustion chamber, four temperature measuring points b, c, d, and e are set at the bottom of the combustion chamber; four temperature measuring points f, g, h, and i are set at the throat of the combustion chamber; four temperature measuring points j, k, l, and m are set at the bottom of the valve pit; four temperature measuring points n, o, p, and q are set on the top of the piston, and a thermocouple is installed in each temperature measuring hole.

[0032] Combination Figure 4As shown, due to the special position of the throat of the combustion chamber, it is not easy to install a thermocouple. The method of drilling holes in the throat of the combustion chamber in this embodiment is that the four temperature measuring holes provided at the throat of the combustion chamber 110 are respectively the first temperature measuring hole f, the second temperature measuring hole g, the third temperature measuring hole h and the fourth temperature measuring hole i. The first temperature measuring hole f, the second temperature measuring hole g, the third temperature measuring hole h and the fourth temperature measuring hole i are evenly distributed on the side wall of the engine piston 100, and the first temperature measuring hole f, the second temperature measuring hole g, the third temperature measuring hole h and the fourth temperature measuring hole i extend from the side wall of the engine piston 100 in the horizontal direction to the throat 110 of the combustion chamber, respectively. The hole diameter is 2 mm, and the distance between the end face of the hole close to the throat 110 of the combustion chamber and the throat 110 of the combustion chamber is 5 mm. The thermocouples can be placed in the four temperature measuring holes, which can not only accurately measure the temperature of the throat area, but also facilitate the installation of thermocouples.

[0033] The use process of the engine piston thermal fatigue test device of this embodiment is as follows: the first engine piston 100A is placed upside down on the first supporting plate 531, a pin is inserted into the first engine piston 100A to place the first engine piston 100A on the first supporting plate 531, the top surface of the first engine piston 100A extends out from the through hole 533, and the second engine piston 100B is installed on the second supporting plate 532 in the same manner as the first piston, which will not be repeated, the bracket 520 is rotated to make the center of the combustion chamber of the top surface of the first engine piston 100A correspond to the center of the fire cover 420, and then the bracket 520 is swung to make the second supporting plate 532 correspond to the liquefied gas stove 410, and the second engine piston 100B is adjusted. 0B, so that the center of the combustion chamber on the top surface of the second engine piston 100B corresponds to the center of the fire cover 420; turn on the liquefied gas stove 410, flame heat the first engine piston 100A, and after heating to the set temperature (the set temperature for heating is determined by the temperature field of the piston and the bottom test), start the cylinder 510, and the cylinder 510 pushes the bracket 520 to rotate, so that the first engine piston 100A corresponds to the water spraying platform 310 below, and the water spraying platform 310 below cools the first engine piston 100A until it cools to a preset low temperature, which is also determined by the temperature field of the piston and the bottom test. During the cooling of the first piston, the liquefied gas stove 410 heats the second piston at the same time. In this cycle, the heating and cooling of each engine piston is a thermal fatigue cycle, and the thermal fatigue life of the piston is judged by the number of thermal fatigue cracks.

[0034] The comparison results of the piston flame simulation temperature and the actual piston operating temperature measured by the engine piston thermal fatigue test device of this embodiment are shown in Table 1 below.

[0035] Table 1

[0036]

[0037]

[0038] It can be seen from Table 1 that the engine piston thermal fatigue test device of this embodiment can accurately simulate the temperature field of the piston.

[0039] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for thermal fatigue testing of an engine piston, characterized in that: Includes steps: a) opening temperature measuring holes on the engine piston (100), wherein the temperature measuring holes are arranged in the following manner: a temperature measuring hole is arranged at the center of the piston combustion chamber (130) of the engine piston (100), four temperature measuring holes are arranged on the combustion chamber throat (110), four temperature measuring holes are arranged at the bottom of the piston valve pit (120), and four temperature measuring holes are arranged on the top surface of the engine piston, and a thermocouple is installed corresponding to each temperature measuring hole; b) The heating method adopts flame heating, and a combustion hole is opened on the fire cover (420) of the liquefied fuel stove. The specific method of opening the combustion hole is as follows: 9 to 12 first combustion holes (421) are evenly arranged on the circumference of the fire cover (420) corresponding to the throat (110) of the combustion chamber, and the diameter of each first combustion hole (421) is 4 to 5 mm; 15 to 18 second combustion holes (422) are opened on the fire cover (420) on the circumference corresponding to the bottom of the piston valve pit (120), and the diameter of each second combustion hole (422) is 1 to 2 mm, and the second combustion hole (422) directly opposite to the piston valve pit (120) is 22) account for 2 / 3 of the total number of the second combustion holes (422); 8 to 10 third combustion holes (423) are opened on the circumference of the fire cover (420) corresponding to the top of the piston valve pit (120), the diameter of each third combustion hole (423) is 2 to 3 mm, and the number of the third combustion holes (423) directly facing the piston valve pit (120) accounts for 2 / 3 of the total number of the third combustion holes (423); 4 to 6 fourth combustion holes (424) are evenly opened on the circumference of the fire cover (420) and the bottom of the piston combustion chamber (130), and the diameter of each fourth combustion hole (424) is 2 to 3 mm; c) placing the top of the engine piston (100) on a liquefied gas stove for heating, and aligning the center of the combustion chamber of the engine piston (100) with the center of the fire cover (420); d) When the temperature of the throat of the engine piston (100) reaches a preset high temperature, the engine piston (100) is cooled by water cooling until it reaches a preset low temperature, and then the heating is repeated. This cycle is repeated until cracks appear in the engine piston (100). One heating process and one cooling process constitute one thermal fatigue cycle. The number of thermal fatigue cycles is counted, and the thermal fatigue life of the piston is determined based on the number of thermal fatigue cycles.

2. The method for thermal fatigue testing of an engine piston according to claim 1, characterized in that: The method for opening a temperature measuring hole on the throat (110) of the combustion chamber is to drill a hole from the side wall of the engine piston (100) to the throat in the horizontal direction, wherein the distance between the end surface of the temperature measuring hole close to the throat and the throat is 4 to 6 mm, and the aperture of the temperature measuring hole is 1 to 2 mm.

3. An engine piston thermal fatigue test device, comprising an engine piston (100), a test bench (200), a cooling system (300) and a heating system, wherein the engine piston (100) comprises a combustion chamber throat (110), a piston valve pit (120) and a piston combustion chamber (130), characterized in that: The heating system is a flame heating system (400), comprising a liquefied gas stove (410) and a fire cover (420) covering the combustion port of the liquefied gas stove (410), wherein the fire cover (420) is in the shape of a disc, and 9 to 12 first combustion holes (421) are evenly arranged on the circumference of the fire cover (420) corresponding to the throat of the combustion chamber (110), and the diameter of each first combustion hole (421) is 4 to 5 mm; 15 to 18 second combustion holes (422) are opened on the circumference of the fire cover (420) corresponding to the bottom of the piston valve pit (120), and the diameter of each second combustion hole (422) is 1 to 2 mm, and is aligned with the piston valve pit (120). The number of the second combustion holes (422) directly facing the piston valve pit (120) accounts for 2 / 3 of the total number of the second combustion holes (422); 8 to 10 third combustion holes (423) are opened on the circumference of the fire cover (420) corresponding to the top of the piston valve pit (120), the diameter of each third combustion hole (423) is 2 to 3 mm, and the number of the third combustion holes (423) directly facing the piston valve pit (120) accounts for 1 / 3 of the total number of the third combustion holes (423); 4 to 6 fourth combustion holes (424) are evenly opened on the circumference of the fire cover (420) corresponding to the bottom of the piston combustion chamber (130), and the diameter of each fourth combustion hole (424) is 2 to 3 mm; The engine piston thermal fatigue test device is used to perform the engine piston thermal fatigue test method as claimed in claim 1 or 2.

4. The engine piston thermal fatigue testing device according to claim 3, characterized in that: A temperature measuring hole is provided at the center of the piston combustion chamber (130) of the engine piston (100), four temperature measuring holes are provided at the throat (110) of the combustion chamber, four temperature measuring holes are provided at the bottom of the piston valve pit (120), and four temperature measuring holes are provided on the top surface of the piston, and a thermocouple is installed in each temperature measuring hole.

5. The engine piston thermal fatigue testing device according to claim 4, characterized in that: The four temperature measuring holes provided at the throat (110) of the combustion chamber are respectively a first temperature measuring hole (f), a second temperature measuring hole (g), a third temperature measuring hole (h) and a fourth temperature measuring hole (i). The first temperature measuring hole (f), the second temperature measuring hole (g), the third temperature measuring hole (h) and the fourth temperature measuring hole (i) are evenly distributed on the side wall of the engine piston (100), and the first temperature measuring hole (f), the second temperature measuring hole (g), the third temperature measuring hole (h) and the fourth temperature measuring hole (i) extend from the side wall of the engine piston (100) to the throat (110) of the combustion chamber in the horizontal direction, respectively, and the hole diameters are all 1 to 2 mm, and the distance between the hole end surface close to the throat (110) of the combustion chamber and the throat (110) of the combustion chamber is 3 to 5 mm.

6. The engine piston thermal fatigue testing device according to claim 4, characterized in that: It also includes a swing device (500), the swing device (500) includes a cylinder (510), a bracket (520) and a supporting plate (530), one end of the bracket (520) is movably connected to the telescopic rod of the cylinder (510), the fixed end of the cylinder (510) is hinged to the test bench (200), the middle part of the bracket (520) is rotatably connected to the test bench (200) through a support shaft (521), and the other end of the bracket (520) is fixed with a supporting plate (530) for placing the engine piston (100), and the supporting plate (530) is provided with a through hole for the top surface of the engine piston (100) to extend out.

7. The engine piston thermal fatigue testing device according to claim 6, characterized in that: The supporting plate (530) is provided with two pieces, namely a first supporting plate (531) and a second supporting plate (532), and the first supporting plate (531) and the second supporting plate (532) are respectively arranged on both sides of the bracket (520), and the cooling system (300) includes two water spraying stations (310), and the two water spraying stations (310) are respectively arranged on both sides of the liquefied gas stove (410).

8. The engine piston thermal fatigue testing device according to claim 7, characterized in that: Two water troughs (210) are installed on the test bench (200), and the two water spraying platforms (310) are installed in the two water troughs (210) respectively.

9. The engine piston thermal fatigue testing device according to claim 6, characterized in that: It also includes a control system, which includes the cylinder (510), the thermocouple, and a single-chip microcomputer, wherein a signal input end of the single-chip microcomputer is connected to the thermocouple, and a signal output end of the single-chip microcomputer is connected to the cylinder (510).

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