Device for detecting heat fatigue resistance of die steel

Abstract

The invention relates to the technical field of die steel detection, and discloses a die steel heat fatigue resistance detection device which comprises a detection seat, a detection box mounted on the detection seat, a stress box mounted on the upper side in the detection box, a stress loading mechanism arranged in the stress box, and a rotation shaft rotatably mounted in the center of the detection seat. A detection table is fixedly installed at the upper end of the rotation shaft and 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 and annularly arranged on the outer side of the detection table, a temperature pipe is installed in the temperature cavity in a communicating mode, the temperature pipe is installed on a negative pressure cavity in a communicating mode, and the negative pressure cavity is installed at the bottom of the detection base. The bottom of the detection seat is provided with an air compression mechanism used for guiding air with different temperatures into the negative pressure cavity. According to the device, the temperature in the detection box can be quickly adjusted, so that the temperature change of the die steel in actual work is simulated, and the heat fatigue resistance detection precision of the die steel is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of mold steel detection, in particular to a device for detecting the thermal fatigue resistance of mold steel. Background Art

[0002] Die steel is used to manufacture molds such as cold stamping dies, hot forging dies, and die-casting dies. Dies are essential processing tools for manufacturing parts in industries such as machinery, radio instruments, motors, and electrical appliances. Die quality directly impacts the quality of the press process, product precision, yield, and production costs. Die quality and service life are primarily influenced by the die material and heat treatment, in addition to reasonable structural design and machining accuracy.

[0003] Thermal fatigue, also known as hot and cold fatigue or cracking, refers to the fact that when the mold is working, due to the large temperature difference on the surface of the mold cavity and the effect of rapid cooling and heating, the mold surface produces large thermal stress. When the temperature changes repeatedly, this thermal stress also changes accordingly. In addition, the die-casting mold and hot forging mold are subject to large mechanical loads, which makes it easy for thermal fatigue cracks to occur. This crack is a surface crack, generally shallow, and expands inward under the action of mechanical stress, eventually causing fracture failure.

[0004] Before use, mold steel also requires thermal fatigue testing. However, existing testing equipment for mold steel thermal fatigue resistance cannot effectively simulate the temperature fluctuations found in actual molds, nor can it effectively simulate the mechanical loads to which the mold steel is subjected. Under these test conditions, test data is inaccurate and testing time is prolonged. Therefore, further improvement is needed. Summary of the Invention

[0005] The object of the present invention is to provide a device for detecting the heat fatigue resistance of mold steel to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

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

[0008] As an improved solution of the present invention: the stress loading mechanism includes a loading inclined block rotatably installed at the upper position inside the stress box, the non-inclined position of the upper end of the loading inclined block is connected to the output end of the stress motor, the stress motor is installed at the upper end of the stress box, the inclined position of the lower end of the loading inclined block contacts the stress inclined block, the stress inclined block is slidably arranged inside the stress box through a limiting part, the non-inclined position of the lower end of the stress inclined block is fixedly installed with a stress shaft, the stress shaft passes through the bottom of the stress box and is fixedly connected to the stress block, and the stress shaft sleeve between the lower position of the stress inclined block and the inner side of the bottom of the stress box is installed with a loading spring.

[0009] As an improved solution of the present invention: the limiting portion includes a limiting groove arranged at the shorter side wall position of the stress inclined block, a limiting bar is slidably installed inside the limiting groove, and the limiting bar is fixed on the inner wall position of the stress box.

[0010] As an improved solution of the present invention: the clamping mechanism includes a fixed ring fixedly installed on the detection table, a plurality of clamping shafts are slidably installed on the side wall of the fixed ring, a clamping plate is fixedly installed on the inner end of the clamping shaft, a baffle is fixedly installed on the outer end of the clamping shaft, and a clamping spring is sleeved on the outer side of the clamping shaft between the baffle and the fixed ring.

[0011] As an improved solution of the present invention: the interior of the temperature chamber is designed as a cavity structure, and a plurality of air guide holes are provided at the inner side of the temperature chamber.

[0012] As an improved solution of the present invention: the air compression mechanism includes a hot air cavity and a cold air cavity installed at the bottom position of the detection seat, the end walls of the hot air cavity and the cold air cavity are connected and provided with multiple air inlet holes, the negative pressure cavity on the cold air cavity is connected and installed with a conversion tube, the conversion tube is connected and installed with a conversion valve, the hot air cavity is connected and installed on the conversion valve through the hot air pipe, and the cold air cavity is connected and installed on the conversion valve through the cold air pipe, and the air compression mechanism also includes a circulation drive component.

[0013] As an improved solution of the present invention: the circulation drive component includes a cold air coil arranged inside the cold air cavity and a hot air spiral arranged inside the hot air cavity, multiple heating plates are installed on the hot air spiral, and multiple cold air plates are installed on the cold air coil. One end of the hot air spiral is connected to the cold air coil through a capillary tube and installed on the cold air coil, and the other end is connected to the drive box through a heat release pipe. A dryer is also installed on the capillary tube. The drive box is fixed to the bottom of the test bench, and the drive box is also connected to the cold air coil through a return pipe. One-way valves are respectively installed inside the return pipe and the heat release pipe. The circulation drive component also includes a drive part.

[0014] As an improved solution of the present invention: the driving part includes a transmission shaft rotatably installed inside the hot air cavity, a driving protrusion is fixedly installed on the transmission shaft, a driving plug is slidably installed inside the driving box, a driving shaft is fixedly installed on the driving plug, a driving ball is fixedly installed on the end of the driving shaft away from the driving plug, the driving ball and the driving protrusion are arranged in contact with each other, a pressure plate is also installed on the driving shaft exposed on the outside of the driving box, and a compression spring is sleeved on the outside of the driving shaft between the pressure plate and the outer wall of the driving box.

[0015] As an improved solution of the present invention: the bottom of the rotating shaft extends to the bottom of the negative pressure chamber, and a plurality of negative pressure fan blades are installed on the outside of the rotating shaft inside the negative pressure chamber, and a plurality of hot air fan blades are installed on the transmission shaft inside the hot air chamber.

[0016] As an improved solution of the present invention: an L-shaped frame is also installed at the bottom of the detection seat, a detection motor is installed on the L-shaped frame, the output end of the detection motor is connected to the rotating shaft, a driving pulley is also installed on the rotating shaft exposed to the outside of the negative pressure chamber, a driven pulley is installed on the outside of the driving pulley through a belt, and the driven pulley is fixedly installed on the transmission shaft.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. Through the cooperation of the negative pressure chamber, temperature chamber and air pressure mechanism, the temperature inside the test box can be quickly adjusted, thereby simulating the temperature changes of the mold steel during actual operation, greatly improving the accuracy of the mold steel's thermal fatigue resistance test;

[0019] 2. By setting up a stress loading mechanism on the test box and cooperating with the clamping mechanism, the mechanical load effect of the mold steel during actual operation is simulated, thereby ensuring the mechanical stress changes to the mold steel when the temperature changes, and further improving the quality of the mold steel's thermal fatigue resistance test;

[0020] 3. As for the air compression mechanism itself, by setting up hot air cavity and cold air cavity, the synchronous change of high temperature and low temperature is achieved, and the temperature changes quickly, which further ensures the accuracy of the mold steel's thermal fatigue resistance test. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0023] Figure 3 It is a schematic diagram of the overall bottom-up structure of the present invention;

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

[0025] Figure 5 It is a structural schematic diagram of the air compression mechanism of the present invention;

[0026] Figure 6 Schematic diagram of the structure of the driving part of the present invention;

[0027] Figure 7 Schematic diagram of the internal structure of the negative pressure chamber in the present invention;

[0028] Figure 8 Schematic diagram of the structure of the clamping mechanism of the present invention;

[0029] Figure 9 Schematic diagram of the installation structure of the stress box in the present invention;

[0030] Figure 10 It is a structural schematic diagram of the stress loading mechanism in the present invention.

[0031] In the figure: 1. Test base; 2. Support legs; 3. Door slot; 4. Test box; 5. Stress box; 6. Stress motor; 7. Sealing door; 8. Test motor; 9. Rotation shaft; 10. L-shaped frame; 11. Drive box; 12. Hot air chamber; 13. Cold air chamber; 14. Air inlet; 15. Negative pressure chamber; 16. Temperature tube; 17. Temperature chamber; 18. Air guide hole; 19. Test table; 20. Cold air pipe; 21. Hot air pipe; 22. Capillary tube; 23. Switching valve; 24. Cold air coil; 25. Cold air plate; 26. Dryer; 27. Return pipe; 28. Drive plug; 29 , heat release tube; 30, hot air spiral tube; 31, heating plate; 32, driving protrusion; 33, driving pulley; 34, belt; 35, driving ball; 36, driving shaft; 37, pressure 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 bevel block; 49, stress bevel block; 50, limiting strip; 51, limiting groove; 52, loading spring; 53, hot air fan blade; 54, conversion tube; 55, transmission shaft. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood based on specific circumstances.

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

[0036] Example 1

[0037] See Figures 1 to 10In an embodiment of the present invention, a device for detecting the heat fatigue resistance of mold steel includes a detection seat 1. Support legs 2 are installed at the four corners of the bottom of the detection seat 1 to support the entire detection device. A detection box 4 is installed on the detection seat 1. A door slot 3 is provided through the side wall of the detection box 4. A sealing door 7 is hingedly installed on the door slot 3 to facilitate staff to take and place the mold steel specimen to be tested inside the detection box 4. A stress box 5 is installed at the upper side of the detection box 4. A stress loading mechanism is provided inside the stress box 5 to generate a mechanical load on the mold steel. A rotation shaft 9 is rotatably installed at the center of the detection seat 1. The rotation shaft 9 A testing platform 19 is fixedly installed at the upper end, and the testing platform 19 is arranged inside the testing box 4. A clamping mechanism is provided on the testing platform 19 to ensure that the mold steel does not shake during the mechanical load stress loading process. A temperature chamber 17 is installed on the inner wall of the testing box 4. The temperature chamber 17 is arranged in a ring outside the testing platform 19, so that the temperature of the mold steel can be changed quickly. A temperature pipe 16 is installed inside the temperature chamber 17, and the temperature pipe 16 is installed on the negative pressure chamber 15. The negative pressure chamber 15 is installed at the bottom of the testing 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 testing seat 1.

[0038] In one case of this embodiment, the stress loading mechanism includes a loading inclined block 48 rotatably installed at the upper position inside the stress box 5, the non-inclined position of the upper end of the loading inclined block 48 is connected to the output end of the stress motor 6, the stress motor 6 is installed at the upper end of the stress box 5, the inclined position of the lower end of the loading inclined block 48 contacts the stress inclined block 49, the stress inclined block 49 is slidably arranged inside the stress box 5 through the limiting part, the non-inclined position of the lower end of the stress inclined block 49 is fixedly installed with a stress shaft 46, the stress shaft 46 passes through the bottom of the stress box 5 and is fixedly connected to the stress block 47, and the stress shaft 46 between the lower position of the stress inclined block 49 and the inner side of the bottom of the stress box 5 is sleeved with a loading spring 52.

[0039] The limiting portion includes a limiting groove 51 provided on the shorter side wall of the stress bevel block 49 , a limiting bar 50 is slidably installed inside the limiting groove 51 , and the limiting bar 50 is fixed on the inner wall of the stress box 5 .

[0040] The working principle of the above-mentioned stress recording mechanism is: start the stress motor 6, which directly drives the loading bevel block 48 to rotate. Since the contact area between the loading bevel block 48 and the stress bevel block 49 is designed as an inclined surface structure, and with the cooperation of the limiting part, the stress bevel block 49 only moves linearly and does not rotate. Then, with the cooperation of the loading spring 52, it drives the stress block 47 to move linearly up and down, thereby generating a mechanical load on the mold steel specimen in the clamping state.

[0041] In a preferred embodiment of this embodiment, the clamping mechanism includes a fixed ring 41 fixedly mounted on the test platform 19. Multiple clamping shafts 43 are slidably mounted on the sidewall of the fixed ring 41. A clamping plate 45 is fixedly mounted on the inner end of the clamping shaft 43, a baffle 42 is fixedly mounted on the outer end of the clamping shaft 43, and a clamping spring 44 is sleeved and mounted on the outer side of the clamping shaft 43 between the baffle 42 and the fixed ring 41. During operation, a mold steel test piece is placed between the multiple clamping plates 45 located inside the fixed ring 41. Then, under the pushing force of the baffle 42 and the clamping spring 44, the mold steel test piece is detachably clamped and fixed.

[0042] In addition, in order to ensure that the temperature chamber 17 can quickly discharge gases of different temperatures, the interior of the temperature chamber 17 is designed as a cavity structure, and a plurality of gas guide holes 18 are provided at the inner position of the temperature chamber 17.

[0043] In one case of this embodiment, the air compression mechanism includes a hot air cavity 12 and a cold air cavity 13 installed at the bottom position of the detection seat 1. The end walls of the hot air cavity 12 and the cold air cavity 13 are connected and provided with multiple air inlet holes 14. The negative pressure cavity 15 on the cold air cavity 13 is connected and installed with a conversion tube 54. The conversion tube 54 is connected and installed with a conversion valve 23. The hot air cavity 12 is connected and installed on the conversion valve 23 through the hot air pipe 21, and the cold air cavity 13 is connected and installed on the conversion valve 23 through the cold air pipe 20. The conduction state of the hot air pipe 21 and the cold air pipe 20 is changed by the conversion valve 23, thereby ensuring that the hot air or cold air introduced into the negative pressure cavity 15 is controllable, further ensuring the reliability of the entire detection device.

[0044] In addition, in this embodiment, the air compression mechanism also includes a circulation drive component, which includes a cold air coil 24 arranged inside the cold air cavity 13 and a hot air coil 30 arranged inside the hot air cavity 12. The hot air coil 30 is arranged in a three-dimensional vertical direction. A plurality of heating plates 31 are installed on the hot air coil 30. The heating plates 31 are not started in the cooling state of the entire air compression mechanism and are used to accelerate the heat dissipation effect of the hot air coil 30. When the air compression mechanism is in the heating state, they are started. A plurality of cold air plates 25 are installed on the cold air coil 24, thereby accelerating the cooling of the cold air coil. The cooling speed of the tube 24 is increased to ensure that it can absorb more heat. One end of the hot air spiral tube 30 is connected to the cold air coil 24 through the capillary tube 22, and the other end is connected to the drive box 11 through the heat release pipe 29. A dryer 26 is also installed on the capillary tube 22. The drive box 11 is fixed to the bottom of the test table 19. The drive box 11 is also connected to the cold air coil 24 through the return pipe 27. The return pipe 27 and the heat release pipe 29 are respectively equipped with a one-way valve, thereby ensuring the one-way flow of the medium in the return pipe 27 and the heat release pipe 29.

[0045] At the same time, in order to ensure the circulation flow of the above-mentioned medium inside the pipeline, the circulation drive assembly also includes a driving part, which includes a transmission shaft 55 rotatably installed inside the hot gas chamber 12, and a driving protrusion 32 is fixedly installed on the transmission shaft 55. A driving plug 28 is slidably installed inside the drive box 11, and a driving shaft 36 is fixedly installed on the driving plug 28. A driving ball 35 is fixedly installed on the end of the driving shaft 36 away from the driving plug 28, and the driving ball 35 is arranged in contact with the driving protrusion 32. A pressure plate 37 is also installed on the driving shaft 36 exposed on the outside of 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. During the rotation of the transmission shaft 55, the driving protrusion 32 is directly driven to rotate. When the protruding part of the driving protrusion 32 contacts the driving ball 35, the driving plug 28 compresses the medium inside the driving box 11 with the cooperation of the driving shaft 36. Then the transmission shaft 55 continues to rotate. When the protruding part of the driving protrusion 32 does not contact the driving ball 35, the driving plug 28 moves back inside the driving box 11 with the cooperation of the compression spring 38, and then the medium is re-sucked into the driving box 11. This cycle is repeated to achieve the cooling or heating function.

[0046] In addition, the bottom of the rotating shaft 9 is extended to the bottom of the negative pressure chamber 15, and a plurality of 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 air and cold air. At the same time, a plurality of hot air fan blades 53 are installed on the transmission shaft 55 inside the hot air chamber 12, thereby accelerating the heat release effect of the hot air coil 30.

[0047] The working principle of the above-mentioned air compression mechanism is: after the medium is compressed inside the drive box 11, a high-temperature and high-pressure gaseous medium is formed. Then, the gaseous medium enters the hot air spiral tube 30 under the action of the heat release pipe 29 and condenses into a liquid medium and continuously releases heat. At this time, the heat release is accelerated by the rotation of the hot air fan blades 53. After the liquid medium releases heat, it enters the capillary tube 22 for expansion, thereby increasing the volume of the medium itself and reducing the pressure. Then, the medium evaporates inside the cold air coil 24 to form a gaseous medium, and then continuously absorbs the heat inside the cold air cavity 13, so that the cold air cavity 13 itself forms a refrigeration function. After that, the gaseous medium enters the drive box 11 again through the return pipe 27 and is compressed. This cycle realizes the refrigeration function of the cold air cavity 13.

[0048] During the above operation, when the air compressor is required to realize the heating function as a whole, the hot air in the hot air chamber 12 is connected to the negative pressure chamber 15 through the switching valve 23. At the same time, in order to increase the heating effect, the staff can start the heating plate 31 to perform the auxiliary heating function. When the air compressor is required to realize the cooling function as a whole, the cold air in the cold air chamber 13 is connected to the negative pressure chamber 15 through the switching valve 23, and the heating plate 31 is turned off. The cooling or heating effect of the air compressor is realized through the above operation.

[0049] To further ensure that the different temperature gases generated by the temperature chamber 17 do not interfere with the temperature of the mold steel, in this embodiment, an L-shaped frame 10 is further installed at the bottom of the detection base 1. A detection motor 8 is mounted 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-mentioned 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, thereby contacting air of different temperatures in all directions, thereby achieving the purpose of uniform cooling or heating.

[0050] Example 2

[0051] The present invention also provides another embodiment, which differs from the above embodiment in that a driving pulley 33 is further mounted on the rotating shaft 9 exposed to the outside of the negative pressure chamber 15. A driven pulley 39 is mounted on the outside of the driving pulley 33 via a belt 34. The driven pulley 39 is fixedly mounted on the transmission shaft 55. Through the coordination of the above structure, a detection motor 8 can not only rotate the mold steel itself, but also enable the negative pressure chamber 15 to perform negative pressure suction operation, while also causing the transmission shaft 55 to rotate, thereby driving the effective operation of the drive plug 28 inside the entire drive box 11 and also driving the hot air fan blades 53 to rotate, thereby accelerating the heat release effect of the hot air chamber 12.

[0052] To sum up, during the inspection, the mold steel specimen is placed on the inspection table 19, and then the mold steel is clamped and fixed under the action of the clamping mechanism, and then the inspection motor 8 is started, and then under the action of the air compression mechanism, the temperature around the mold steel changes, thereby simulating the actual working environment of the mold steel. After the temperature simulation is completed, the inspection motor 8 is turned off and the stress motor 6 is turned on at the same time. Then, with the cooperation of the stress loading mechanism, the stress block 47 continuously generates a mechanical load on the mold steel, and finally the thermal fatigue resistance test needs of the mold steel are achieved.

[0053] 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 in the scope of protection of the present invention.

Claims

1. A device for detecting heat fatigue resistance of mold steel, comprising a detection seat (1), characterized in that: The detection seat (1) is provided with a detection box (4), a stress box (5) is provided at the upper position inside the detection box (4), a stress loading mechanism is provided inside the stress box (5), a rotation shaft (9) is rotatably provided at the center position of the detection seat (1), a detection platform (19) is fixedly provided at the upper end of the rotation shaft (9), the detection platform (19) is provided inside the detection box (4), a clamping mechanism is provided on the detection platform (19), a temperature cavity (17) is provided on the inner wall of the detection box (4), the temperature cavity (17) is provided in an annular manner outside the detection platform (19), a temperature tube (16) is provided inside the temperature cavity (17), the temperature tube (16) is provided in a connected manner on the negative pressure cavity (15), the negative pressure cavity (15) is provided at the bottom of the detection seat (1), and an air compression mechanism for introducing air of different temperatures into the negative pressure cavity (15) is provided at the bottom of the detection seat (1).

2. The device for detecting heat fatigue resistance of mold steel according to claim 1, characterized in that: The stress loading mechanism includes a loading inclined block (48) rotatably mounted at an upper position inside the stress box (5); the non-inclined position at the upper end of the loading inclined block (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 inclined position at the lower end of the loading inclined block (48) contacts a stress inclined block (49); the stress inclined block (49) is slidably arranged inside the stress box (5) through a limiting portion; a stress shaft (46) is fixedly mounted at the non-inclined position at the lower end of the stress inclined block (49); the stress shaft (46) passes through the bottom of the stress box (5) and is fixedly connected to the stress block (47); and a loading spring (52) is sleeved and mounted on the stress shaft (46) between the lower position of the stress inclined block (49) and the inner side of the bottom of the stress box (5).

3. The device for detecting heat fatigue resistance of mold steel according to claim 2, characterized in that: The limiting portion comprises a limiting groove (51) provided at a shorter side wall position of the stress inclined block (49), a limiting strip (50) being slidably mounted inside the limiting groove (51), and the limiting strip (50) being fixed to an inner wall position of the stress box (5).

4. The device for detecting heat fatigue resistance of mold steel according to claim 1, characterized in that: The clamping mechanism comprises a fixing ring (41) fixedly mounted on the detection table (19), a plurality of clamping shafts (43) being slidably mounted on the side wall of the fixing ring (41), a clamping plate (45) being fixedly mounted on one end of the inner side of the clamping shaft (43), a baffle (42) being fixedly mounted on one end of the outer side of the clamping shaft (43), and a clamping spring (44) being sleeved and mounted on the outer side of the clamping shaft (43) between the baffle (42) and the fixing ring (41).

5. The device for detecting heat fatigue resistance of mold steel according to claim 1, characterized in that: The interior of the temperature cavity (17) is designed as a hollow structure, and a plurality of air guide holes (18) are provided in communication with the inner side of the temperature cavity (17).

6. The device for detecting heat fatigue resistance of mold steel according to claim 1, characterized in that: The air compression mechanism comprises a hot air cavity (12) and a cold air cavity (13) installed at the bottom position of the detection seat (1); the end walls of the hot air cavity (12) and the cold air cavity (13) are connected and provided with a plurality of air inlet holes (14); the negative pressure cavity (15) on the cold air cavity (13) is connected and installed with a conversion tube (54); the conversion tube (54) is connected and installed with a conversion valve (23); the hot air cavity (12) is connected and installed on the conversion valve (23) through the hot air pipe (21); the cold air cavity (13) is connected and installed on the conversion valve (23) through the cold air pipe (20); and the air compression mechanism further comprises a circulation drive component.

7. The device for detecting heat fatigue resistance of mold steel according to claim 6, characterized in that: The circulation drive assembly includes a cold air coil (24) arranged inside the cold air cavity (13) and a hot air coil (30) arranged inside the hot air cavity (12), a plurality of heating plates (31) are installed on the hot air coil (30), and a plurality of 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 pipe (29). A dryer (26) is also installed on the capillary tube (22). The drive box (11) is fixed to the bottom of the detection table (19). The drive box (11) is also connected to the cold air coil (24) through a return pipe (27). One-way valves are respectively installed inside the return pipe (27) and the heat release pipe (29). The circulation drive assembly also includes a drive unit.

8. The device for detecting heat fatigue resistance of mold steel according to claim 7, characterized in that: The driving portion includes a transmission shaft (55) rotatably mounted inside the hot gas cavity (12), a driving protrusion (32) fixedly mounted on the transmission shaft (55), a driving plug (28) slidably mounted inside the driving box (11), a driving shaft (36) fixedly mounted on the driving plug (28), a driving ball (35) fixedly mounted on one end of the driving shaft (36) away from the driving plug (28), the driving ball (35) and the driving protrusion (32) being arranged in contact with each other, a pressing plate (37) further mounted on the driving shaft (36) exposed outside the driving box (11), and a compression spring (38) sleeved on the outside of the driving shaft (36) between the pressing plate (37) and the outer wall of the driving box (11).

9. The device for detecting heat fatigue resistance of mold steel according to claim 8, characterized in that: The bottom of the rotating shaft (9) extends to the bottom of the negative pressure chamber (15), and a plurality of negative pressure blades (40) are installed on the outside of the rotating shaft (9) located inside the negative pressure chamber (15), and a plurality of hot air blades (53) are installed on the transmission shaft (55) located inside the hot air chamber (12).

10. The device for detecting heat fatigue resistance of mold steel according to claim 9, characterized in that: An L-shaped frame (10) is further installed at the bottom of the detection seat (1), and a detection motor (8) is installed on the L-shaped frame (10). The output end of the detection motor (8) is connected to the rotation shaft (9). A driving pulley (33) is also installed on the rotation shaft (9) exposed to the outside of the negative pressure chamber (15). A driven pulley (39) is installed on the outside of the driving pulley (33) through a belt (34). The driven pulley (39) is fixedly installed on the transmission shaft (55).

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