A device for detecting the thermal fatigue resistance of die steel

Abstract

The application relates to the technical field of die steel detection, and discloses a device for detecting the heat resistance fatigue of die steel, which comprises a detection seat, a detection box is installed on the detection seat, a stress box is installed on the upper side position in the detection box, a stress loading mechanism is arranged in the stress box, a self-rotation shaft is rotationally installed at the center position of the detection seat, a detection table is fixedly installed at the upper end of the self-rotation shaft, the detection table is arranged in the detection box, a clamping mechanism is arranged on the detection table, a temperature cavity is installed on the inner wall of the detection box, the temperature cavity is annularly arranged on the outer side of the detection table, a temperature pipe is communicatively installed in the temperature cavity, the temperature pipe is communicatively installed on a negative pressure cavity, the negative pressure cavity is installed on the bottom of the detection seat, and an air pressure mechanism for guiding different temperature air into the negative pressure cavity is arranged on the bottom of the detection seat. The device can rapidly adjust the temperature in the detection box, thereby simulating the temperature change of the die steel in actual work, and greatly improves the heat resistance fatigue detection precision of the die steel.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of die steel detection, and particularly relates to a die steel heat resistance fatigue detection device. BACKGROUND

[0002] Die steel is a kind of steel used for manufacturing cold punching die, hot forging die, die casting die and the like. The die is a main processing tool for manufacturing parts in the industrial departments of mechanical manufacturing, radio instrument, motor and electric appliance. The quality of the die directly affects the quality of the pressure processing technology, the precision and yield of the product and the production cost, and the quality and service life of the die are mainly affected by the die material and heat treatment in addition to the reasonable structure design and processing precision.

[0003] Thermal fatigue, also known as cold and hot fatigue or crack, refers to that when the die is working, a large temperature difference exists on the surface of the die cavity, and under the action of rapid cooling and rapid heating, a large thermal stress is generated on the surface of the die. When the temperature repeatedly changes, the thermal stress also changes, and under the action of a large mechanical load, the die casting die and the hot forging die are prone to thermal fatigue cracks. The crack is a surface crack, which is generally shallow and expands to the inside under the action of mechanical stress, and finally causes fracture failure.

[0004] Before the die steel is applied, the heat resistance fatigue detection needs to be performed. However, the existing die steel heat resistance fatigue detection device cannot effectively simulate the temperature change environment of the actual die, and cannot effectively simulate the mechanical load acting on the die steel. Under such test conditions, the test data is inaccurate, and the test time is also prolonged. Therefore, further improvement is needed. SUMMARY

[0005] The present application aims to provide a die steel heat resistance fatigue detection device to solve the problems in the background.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme.

[0007] A die steel heat resistance fatigue detection device comprises a detection seat, a detection box is installed on the detection seat, a stress box is installed on the upper side inside the detection box, a stress loading mechanism is arranged in the stress box, a self-rotation shaft is rotatably installed at the center position of the detection seat, a detection table is fixedly installed on the upper end of the self-rotation shaft, the detection table is arranged in the detection box, a clamping mechanism is arranged on the detection table, a temperature cavity is installed on the inner wall of the detection box, the temperature cavity is annularly arranged outside the detection table, a temperature pipe is communicatively installed in the temperature cavity, the temperature pipe is communicatively installed on a negative pressure cavity, the negative pressure cavity is installed at the bottom of the detection seat, and an air pressure mechanism for introducing air of different temperatures into the negative pressure cavity is arranged at the bottom of the detection seat.

[0008] As a further improved scheme of the present application: the stress loading mechanism comprises a loading inclined block rotatably installed at the upper side position inside the stress box, the output end of a stress motor is connected to the upper end of the loading inclined block at a non-inclined position, the stress motor is installed at the upper end position of the stress box, the lower end of the loading inclined block is in contact with a stress inclined block at an inclined position, the stress inclined block is slidably arranged inside the stress box through a limiting part, a stress shaft is fixedly installed at the lower end of the stress inclined block at a non-inclined position, the stress shaft is fixedly connected to a stress block through the bottom of the stress box.

[0009] As a further improved scheme of the present application: the limiting part comprises a limiting groove arranged at the shorter side wall position of the stress inclined block, a limiting strip is slidably installed inside the limiting groove, and the limiting strip is fixedly installed at the inner wall position of the stress box.

[0010] As a further improved scheme of the present application: the clamping mechanism comprises a fixed ring fixedly installed at the detection table, a plurality of clamping shafts are slidably installed at the side wall of the fixed ring, a clamping plate is fixedly installed at the inner side of one end of the clamping shaft, a baffle is fixedly installed at the outer side of the other end of the clamping shaft, and a clamping spring is installed at the outer side of the clamping shaft between the baffle and the fixed ring.

[0011] As a further improved scheme of the present application: the temperature cavity is designed as a hollow cavity structure, and a plurality of air guide holes are arranged at the inner side position of the temperature cavity.

[0012] As a further improved scheme of the present application: the air pressure mechanism comprises a hot gas cavity and a cold gas cavity installed at the bottom position of the detection seat, a plurality of air inlet holes are arranged at the end wall of the hot gas cavity and the cold gas cavity, a conversion pipe is installed at the cold gas cavity and connected to the negative pressure cavity, a conversion valve is installed at the conversion pipe, the hot gas cavity is connected to the conversion valve through a hot gas pipe, the cold gas cavity is connected to the conversion valve through a cold gas pipe, and the air pressure mechanism further comprises a circulating driving assembly.

[0013] As a further improved scheme of the present application: the circulating driving assembly comprises a cold gas coil pipe arranged inside the cold gas cavity and a hot gas spiral pipe arranged inside the hot gas cavity, a plurality of heating plates are installed at the hot gas spiral pipe, and a plurality of cold gas plates are installed at the cold gas coil pipe, one end of the hot gas spiral pipe is connected to the cold gas coil pipe through a capillary tube, the other end of the hot gas spiral pipe is connected to a driving box through a heat dissipation pipe, a dryer is further installed at the capillary tube, the driving box is fixed at the bottom of the detection table, the driving box is further connected to the cold gas coil pipe through a return pipe, one-way valves are respectively installed inside the return pipe and the heat dissipation pipe, and the circulating driving assembly further comprises a driving part.

[0014] As a further improvement of the application: the driving part comprises a transmission shaft rotatably installed inside the hot air cavity, a driving protrusion fixedly installed on the transmission shaft, a driving plug slidably installed inside the driving box, a driving shaft fixedly installed on the driving plug, a driving ball fixedly installed on the end of the driving shaft away from the driving plug, the driving ball and the driving protrusion being in contact with each other, and a pressing plate installed on the driving shaft exposed outside the driving box, the driving shaft outside between the pressing plate and the outer wall of the driving box being sleeved with a compression spring.

[0015] As a further improvement of the application: the self-rotating shaft extends to the bottom of the negative pressure cavity, and a plurality of negative pressure vanes are installed on the outside of the self-rotating shaft inside the negative pressure cavity, and a plurality of hot air vanes are installed on the transmission shaft inside the hot air cavity.

[0016] As a further improvement of the application: the bottom of the detection seat is further provided with an L-shaped bracket, a detection motor is installed on the L-shaped bracket, the output end of the detection motor is connected to the self-rotating shaft, a driving pulley is installed on the self-rotating shaft exposed outside the negative pressure cavity, and a driven pulley is installed on the transmission shaft through a belt outside the driving pulley.

[0017] Compared with the prior art, the application has the following advantages:

[0018] 1. The mutual cooperation of the negative pressure cavity, the temperature cavity and the air pressure mechanism enables rapid temperature adjustment inside the detection box, thereby simulating the temperature change of the mold steel in actual work and greatly improving the fatigue detection precision of the mold steel in heat resistance.

[0019] 2. The stress loading mechanism is provided on the detection box, and the mechanical load acting on the mold steel in actual work is simulated under the cooperation of the clamping mechanism, thereby ensuring the mechanical stress change of the mold steel when the temperature changes and further improving the fatigue detection quality of the mold steel in heat resistance.

[0020] 3. In terms of the air pressure mechanism itself, the hot air cavity and the cold air cavity are provided to realize synchronous change of high temperature and low temperature, and the temperature changes quickly, thereby further ensuring the fatigue detection precision of the mold steel in heat resistance. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a schematic diagram of the overall top view structure of the application;

[0022] Figure 2 is a schematic diagram of the overall front view structure of the application;

[0023] Figure 3 is a schematic diagram of the overall bottom view structure of the application;

[0024] Figure 4 is a schematic diagram of the internal cross-sectional structure of the application;

[0025] Figure 5 It is a structure schematic view of hollow compression mechanism in the application;

[0026] Figure 6 It is a structure schematic view of driving part in the application;

[0027] Figure 7 It is a structure schematic view of internal structure of negative pressure cavity in the application;

[0028] Figure 8 It is a structure schematic view of clamping mechanism in the application;

[0029] Figure 9 It is a structure schematic view of installation structure of stress box in the application;

[0030] Figure 10 It is a structure schematic view of stress loading mechanism in the application.

[0031] In the figure: 1, detection seat; 2, support leg; 3, door slot; 4, detection box; 5, stress box; 6, stress motor; 7, sealing door; 8, detection motor; 9, rotation axis; 10, L-shaped frame; 11, driving box; 12, hot air cavity; 13, cold air cavity; 14, air inlet hole; 15, negative pressure cavity; 16, temperature tube; 17, temperature cavity; 18, air guide hole; 19, detection table; 20, cold air pipe; 21, hot air pipe; 22, capillary tube; 23, conversion valve; 24, cold air coil; 25, cold air plate; 26, dryer; 27, return pipe; 28, driving plug; 29, heat dissipation pipe; 30, hot air coil; 31, heating plate; 32, driving protrusion; 33, driving pulley; 34, belt; 35, driving ball; 36, driving shaft; 37, pressing plate; 38, compression spring; 39, driven pulley; 40, negative pressure fan blade; 41, fixing ring; 42, baffle; 43, clamping shaft; 44, clamping spring; 45, clamping plate; 46, stress shaft; 47, stress block; 48, loading inclined block; 49, stress inclined block; 50, limiting strip; 51, limiting slot; 52, loading spring; 53, hot air fan blade; 54, conversion pipe; 55, transmission shaft. DETAILED DESCRIPTION

[0032] It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other without conflict.

[0033] In the description of the present application, it is to be understood by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application, in addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features referred to, therefore, the features with "first", "second" and the like can explicitly or implicitly include one or more of the features, in the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0034] In the description of the present application, it is to be understood that unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium; can be the communication between two elements, for those skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0035] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. Embodiments

[0036] Reference Figures 1-10In the embodiment of the present application, a device for detecting the thermal fatigue resistance of die steel comprises a detection seat 1, support legs 2 are installed at the bottom of the four corners of the detection seat 1, and are used to support the entire detection device, a detection box 4 is installed on the detection seat 1, a door groove 3 is arranged through the side wall of the detection box 4, a sealing door 7 is hingedly installed on the door groove 3, so as to facilitate the taking and placing of die steel test pieces in the detection box 4 by the staff, a stress box 5 is installed at the upper side of the inside of the detection box 4, a stress loading mechanism is arranged in the stress box 5, and is used to generate mechanical load on the die steel, a self-rotation shaft 9 is rotatably installed at the center of the detection seat 1, a detection table 19 is fixedly installed at the upper end of the self-rotation shaft 9, and the detection table 19 is arranged in the detection box 4, a clamping mechanism is arranged on the detection table 19, so as to ensure that the die steel does not shake during the mechanical load stress loading process, a temperature cavity 17 is installed on the inner wall of the detection box 4, and the temperature cavity 17 is annularly arranged outside the detection table 19, so that the temperature of the die steel can be quickly changed, a temperature pipe 16 is communicatively installed in the temperature cavity 17, the temperature pipe 16 is communicatively installed on a negative pressure cavity 15, and the negative pressure cavity 15 is installed at the bottom of the detection seat 1, and an air pressure mechanism for introducing air of different temperatures into the negative pressure cavity 15 is arranged at the bottom of the detection seat 1.

[0037] In one case of the embodiment, the stress loading mechanism comprises a loading inclined block 48 rotatably installed at the upper side of the inside of the stress box 5, the output end of a stress motor 6 is connected to the non-inclined surface position of the upper end of the loading inclined block 48, the stress motor 6 is installed at the upper end position of the stress box 5, the lower end inclined surface position of the loading inclined block 48 is in contact with a stress inclined block 49, the stress inclined block 49 is slidably arranged in the stress box 5 through a limiting portion, a stress shaft 46 is fixedly installed at the non-inclined surface position of the lower end of the stress inclined block 49, the stress shaft 46 is fixedly connected to a stress block 47 through the bottom of the stress box 5, and a loading spring 52 is sleevedly installed on the stress shaft 46 between the lower side position of the stress inclined block 49 and the inside of the bottom of the stress box 5.

[0038] The limiting portion comprises a limiting groove 51 arranged at the shorter side wall position of the stress inclined block 49, and a limiting strip 50 is slidably installed in the limiting groove 51.

[0039] The working principle of the stress loading mechanism is as follows: the stress motor 6 is started to directly drive the loading inclined block 48 to rotate, the contact area between the loading inclined block 48 and the stress inclined block 49 is designed as an inclined surface structure, and the stress inclined block 49 only moves linearly and does not rotate under the cooperation of the limiting portion, then the stress block 47 is driven to move linearly up and down under the cooperation of the loading spring 52, so as to generate mechanical load on the die steel test piece in the clamping state.

[0040] In the preferred embodiment of the present application, the clamping mechanism comprises a fixed ring 41 fixedly installed on the detection table 19, a plurality of clamping shafts 43 slidingly installed on the sidewall of the fixed ring 41, a clamping plate 45 fixedly installed on the inner side of the clamping shaft 43, a baffle plate 42 fixedly installed on the outer side of the clamping shaft 43, and a clamping spring 44 installed on the outer side of the clamping shaft 43 between the fixed ring 41 and the baffle plate 42. In operation, the mold steel test piece is placed between the plurality of clamping plates 45 on the inner side of the fixed ring 41, and then the mold steel test piece is detachably clamped and fixed under the pushing force of the baffle plate 42 and the clamping spring 44.

[0041] In addition, in order to ensure that the temperature cavity 17 can quickly guide out the gas at different temperatures, the temperature cavity 17 is designed as a hollow cavity structure, and a plurality of gas guiding holes 18 are arranged in communication at the inner side of the temperature cavity 17.

[0042] In one case of the present application, the air compression mechanism comprises a hot gas cavity 12 and a cold gas cavity 13 installed at the bottom of the detection seat 1, a plurality of air inlet holes 14 arranged in communication at the end wall of the hot gas cavity 12 and the cold gas cavity 13, a conversion pipe 54 installed in communication on the cold gas cavity 13, a conversion valve 23 installed in communication on the conversion pipe 54, the hot gas cavity 12 installed in communication on the conversion valve 23 through a hot gas pipe 21, the cold gas cavity 13 installed in communication on the conversion valve 23 through a cold gas pipe 20, and the conversion valve 23 used to change the conduction state of the hot gas pipe 21 and the cold gas pipe 20, so as to ensure that the hot gas or the cold gas guided into the negative pressure cavity 15 is controllable, and further ensure the reliability of the entire detection device.

[0043] In addition, in the present application, the air compression mechanism further comprises a circulating driving assembly, which comprises a cold gas coil pipe 24 arranged in the cold gas cavity 13 and a hot gas spiral pipe 30 arranged in the hot gas cavity 12, the hot gas spiral pipe 30 arranged in a three-dimensional vertical direction, a plurality of heating plates 31 installed on the hot gas spiral pipe 30, the heating plates 31 not started in the refrigeration state of the entire air compression mechanism, used to accelerate the heat dissipation effect of the hot gas spiral pipe 30, and the heating plates 31 started in the heating state of the air compression mechanism, a plurality of cold gas plates 25 installed on the cold gas coil pipe 24, thereby accelerating the refrigeration speed of the cold gas coil pipe 24, so as to ensure that it can absorb more heat, one end of the hot gas spiral pipe 30 installed in communication on the cold gas coil pipe 24 through a capillary tube 22, the other end of the hot gas spiral pipe 30 installed in communication on the driving box 11 through a heat releasing pipe 29, a dryer 26 further installed on the capillary tube 22, the driving box 11 fixed at the bottom of the detection table 19, the driving box 11 further installed in communication on the cold gas coil pipe 24 through a backflow pipe 27, and one-way valves respectively installed in the backflow pipe 27 and the heat releasing pipe 29, thereby ensuring the one-way flow of the medium in the backflow pipe 27 and the heat releasing pipe 29.

[0044] Meanwhile, in order to ensure the circulation of the above-mentioned medium inside the pipeline, the circulation drive assembly also includes a drive unit. The drive unit includes a drive shaft 55 rotatably installed inside the hot gas chamber 12. A drive protrusion 32 is fixedly installed on the drive shaft 55. A drive plug 28 is slidably installed inside the drive box 11. A drive shaft 36 is fixedly installed on the drive plug 28. A drive ball 35 is fixedly installed at the end of the drive shaft 36 away from the drive plug 28. The drive ball 35 and the drive protrusion 32 are in contact with each other. A pressure plate 37 is also installed on the drive shaft 36 exposed on the outside of the drive box 11. A compression spring 38 is sleeved on the outside of the drive shaft 36 between the pressure plate 37 and the outer wall of the drive box 11. During the rotation of the drive shaft 55, the drive protrusion 32 is directly driven to rotate. When the protruding part of the drive protrusion 32 contacts the drive ball 35, the drive plug 28 compresses the medium inside the drive box 11 with the cooperation of the drive shaft 36. Then the drive shaft 55 continues to rotate. When the protruding part of the drive protrusion 32 is no longer in contact with the drive ball 35, the drive plug 28 moves back inside the drive box 11 with the cooperation of the compression spring 38, thereby drawing the medium back into the drive box 11. This cycle is repeated to achieve the cooling or heating function.

[0045] In addition, the bottom of the rotating shaft 9 is extended to the bottom of the negative pressure chamber 15, and multiple negative pressure fan blades 40 are installed on the outside of the rotating shaft 9 inside the negative pressure chamber 15, thereby ensuring the negative pressure suction effect of the negative pressure chamber 15 for hot and cold air. At the same time, multiple hot air fan blades 53 are installed on the drive shaft 55 inside the hot air chamber 12, thereby accelerating the heat release effect of the hot air solenoid 30.

[0046] The working principle of the above-mentioned air compressor mechanism is as follows: After the medium is compressed inside the drive box 11, it forms a high-temperature and high-pressure gaseous medium. Then, under the action of the heat release pipe 29, the gaseous medium enters the hot air spiral tube 30 and condenses into a liquid medium, continuously releasing heat. At this time, the heat release is accelerated by the rotation of the hot air fan blade 53. After the liquid medium finishes releasing heat, it enters the capillary tube 22 to expand, thereby increasing the volume of the medium and reducing the pressure. Then, the medium evaporates inside the cold air spiral tube 24 to form a gaseous medium, which continuously absorbs the heat inside the cold air chamber 13, thereby enabling the cold air chamber 13 to form a cooling function. Then, the gaseous medium re-enters the drive box 11 through the return pipe 27 and is compressed again. This cycle is repeated to realize the cooling function of the cold air chamber 13.

[0047] During the above operation, when the air compressor needs to perform heating, the hot air from the hot air chamber 12 is connected to the negative pressure chamber 15 via the switching valve 23. Simultaneously, to enhance the heating effect, the heating plate 31 can be activated for auxiliary heating. When the air compressor needs to perform cooling, the cold air from the cold air chamber 13 is connected to the negative pressure chamber 15 via the switching valve 23, while the heating plate 31 is closed. These operations achieve either cooling or heating from the air compressor.

[0048] To further ensure the temperature interference of the gases at different temperatures generated in the temperature chamber 17 on the mold steel, in this embodiment, an L-shaped frame 10 is also installed at the bottom of the detection seat 1. A detection motor 8 is installed on the L-shaped frame 10, and the output end of the detection motor 8 is connected to the rotation shaft 9. Through the above structural arrangement, the rotation shaft 9 can directly drive the detection table 19 to rotate, thereby causing the mold steel in the clamped state to rotate and thus come into contact with air at different temperatures from all directions, achieving uniform cooling or heating. Example

[0049] The present invention also provides another embodiment, which differs from the above embodiment in that a driving pulley 33 is also installed on the rotating shaft 9 exposed outside the negative pressure chamber 15. A driven pulley 39 is installed on the outside of the driving pulley 33 via a belt 34, and the driven pulley 39 is fixedly installed on the transmission shaft 55. Through the cooperation of the above structure, a detection motor 8 can not only realize the rotation of the mold steel itself, but also make the negative pressure chamber 15 perform negative pressure suction, and at the same time make the transmission shaft 55 rotate, thereby driving the effective operation of the driving plug 28 inside the entire drive box 11, and also driving the hot air fan blade 53 to rotate, thereby accelerating the heat release effect of the hot air chamber 12.

[0050] In summary, during testing, the mold steel specimen is placed on the testing table 19 and then clamped and fixed by the clamping mechanism. After that, the testing motor 8 is started, and the temperature around the mold steel changes under the action of the air compressor, thereby simulating the actual working environment of the mold steel. After the temperature simulation is completed, the testing motor 8 is turned off and the stress motor 6 is turned on. Then, with the cooperation of the stress loading mechanism, the stress block 47 continuously exerts mechanical load on the mold steel, ultimately achieving the thermal fatigue test requirement of the mold steel.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for testing the thermal fatigue resistance of mold steel, comprising a testing base (1), characterized in that, A test box (4) is installed on the test seat (1). A stress box (5) is installed on the upper side inside the test box (4). A stress loading mechanism is provided inside the stress box (5). A rotating shaft (9) is rotatably installed at the center of the test seat (1). A test platform (19) is fixedly installed on the upper end of the rotating shaft (9). The test platform (19) is set inside the test box (4). A clamping mechanism is provided on the test platform (19). A temperature chamber (17) is installed on the inner wall of the test box (4). The temperature chamber (17) is arranged in a ring outside the test platform (19). A temperature tube (16) is connected inside the temperature chamber (17). The temperature tube (16) is connected to the negative pressure chamber (15). The negative pressure chamber (15) is installed at the bottom of the test seat (1). An air compressor mechanism for introducing air of different temperatures into the negative pressure chamber (15) is provided at the bottom of the test seat (1). The stress loading mechanism includes a loading wedge (48) rotatably mounted inside the stress box (5) at the upper side. The upper non-sloping position of the loading wedge (48) is connected to the output end of the stress motor (6). The stress motor (6) is mounted at the upper end of the stress box (5). The lower sloping position of the loading wedge (48) contacts a stress wedge (49). The stress wedge (49) is slidably mounted inside the stress box (5) through a limiting part. A stress shaft (46) is fixedly mounted at the lower non-sloping position of the stress wedge (49). The stress shaft (46) passes through the bottom of the stress box (5) and is fixedly connected to a stress block (47). A loading spring (52) is sleeved on the stress shaft (46) between the lower position of the stress wedge (49) and the inner side of the bottom of the stress box (5). The air compressor mechanism includes a hot air chamber (12) and a cold air chamber (13) installed at the bottom of the detection seat (1). The end walls of the hot air chamber (12) and the cold air chamber (13) are connected and provided with multiple air inlets (14). The negative pressure chamber (15) on the cold air chamber (13) is connected to a conversion pipe (54). The conversion pipe (54) is connected to a conversion valve (23). The hot air chamber (12) is connected to the conversion valve (23) through a hot air pipe (21). The cold air chamber (13) is connected to the conversion valve (23) through a cold air pipe (20). The air compressor mechanism also includes a circulation drive assembly. The circulating drive assembly includes a cold air coil (24) disposed inside the cold air chamber (13) and a hot air coil (30) disposed inside the hot air chamber (12). Multiple heating plates (31) are installed on the hot air coil (30), and multiple cold air plates (25) are installed on the cold air coil (24). One end of the hot air coil (30) is connected to the cold air coil (24) through a capillary tube (22), and the other end is connected to the drive box (11) through a heat release tube (29). A dryer (26) is also installed on the capillary tube (22). The drive box (11) is fixed to the bottom of the test platform (19). The drive box (11) is also connected to the cold air coil (24) through a return pipe (27). One-way valves are installed inside the return pipe (27) and the heat release tube (29). The circulating drive assembly also includes a drive unit. The drive unit includes a drive shaft (55) rotatably mounted inside the hot air chamber (12), a drive protrusion (32) fixedly mounted on the drive shaft (55), a drive plug (28) slidably mounted inside the drive box (11), a drive shaft (36) fixedly mounted on the drive plug (28), a drive ball (35) fixedly mounted at the end of the drive shaft (36) away from the drive plug (28), the drive ball (35) and the drive protrusion (32) are in contact with each other, a pressure plate (37) is also mounted on the drive shaft (36) exposed outside the drive box (11), and a compression spring (38) is sleeved on the outside of the drive shaft (36) between the pressure plate (37) and the outer wall of the drive box (11). The bottom of the rotating shaft (9) extends to the bottom of the negative pressure chamber (15), and multiple negative pressure fan blades (40) are installed on the outside of the rotating shaft (9) inside the negative pressure chamber (15), and multiple hot air fan blades (53) are installed on the transmission shaft (55) inside the hot air chamber (12).

2. The device for testing the thermal fatigue resistance of mold steel according to claim 1, characterized in that, The limiting part includes a limiting groove (51) located on the shorter side wall of the stress inclined block (49), and a limiting strip (50) is slidably installed inside the limiting groove (51). The limiting strip (50) is fixed on the inner wall of the stress box (5).

3. The device for testing the thermal fatigue resistance of mold steel according to claim 1, characterized in that, The clamping mechanism includes a fixed ring (41) fixedly installed on the testing table (19). Multiple clamping shafts (43) are slidably installed on the side wall of the fixed ring (41). A clamping plate (45) is fixedly installed on one end of the inner side of the clamping shaft (43). A baffle (42) is fixedly installed on one end of the outer side of the clamping shaft (43). A clamping spring (44) is sleeved on the outer side of the clamping shaft (43) between the baffle (42) and the fixed ring (41).

4. The device for testing the thermal fatigue resistance of mold steel according to claim 1, characterized in that, The temperature chamber (17) has a hollow structure design inside, and multiple air guide holes (18) are connected to the inner side of the temperature chamber (17).

5. The device for testing the thermal fatigue resistance of mold steel according to claim 1, characterized in that, The bottom of the detection seat (1) is also equipped with an L-shaped frame (10), on which a detection motor (8) is installed. The output end of the detection motor (8) is connected to the rotating shaft (9). The rotating shaft (9) exposed to the outside of the negative pressure chamber (15) is also equipped with a drive pulley (33). A driven pulley (39) is installed on the outside of the drive pulley (33) via a belt (34). The driven pulley (39) is fixedly installed on the transmission shaft (55).

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