A device for detecting a die steel

Abstract

This utility model discloses a testing device for mold steel, including an operating table, a connecting cover on the top of the operating table, a lifting mechanism for raising and lowering the connecting cover, two L-shaped plates symmetrically arranged on the top of the operating table, a moving mechanism for moving the two L-shaped plates, a connecting box fixed to the top of the connecting cover, a U-shaped plate fixed in the middle of the inner side wall of the connecting box, a semiconductor cooling chip fixed to the inner side wall of the U-shaped plate, multiple first fins fixed at equal intervals on the cold end of the semiconductor cooling chip, and multiple second fins fixed at equal intervals on the hot end of the semiconductor cooling chip, an air blowing mechanism for blowing air into the connecting box on the top of the connecting cover, and a testing mechanism for testing the bending resistance of the mold steel inside the connecting cover. This utility model, through the air blowing mechanism and the semiconductor cooling chip, can simulate low and high temperature environments to test the bending resistance of mold steel under different temperature conditions, improving the reliability of the testing.

Description

Technical Field

[0001] This utility model relates to the field of mold steel testing technology, and in particular to a mold steel testing device. Background Technology

[0002] Mold steel is a type of steel specifically used for manufacturing molds. It possesses excellent mechanical properties, wear resistance, toughness, and heat treatment performance. Mold steel is an important material for manufacturing various molds, and its performance directly affects the quality and service life of the molds. In practical applications of molds, bending resistance is a key indicator, especially under high loads and high temperatures. The bending resistance of mold steel is crucial to the stability and reliability of the molds, thus requiring a testing device for mold steel.

[0003] Traditional mold steel testing devices typically test the bending resistance of mold steel at room temperature. This testing method fails to consider the various environmental factors that mold steel may face in actual applications, such as high or low temperature environments. As a result, the test results cannot accurately reflect the actual performance of mold steel under extreme conditions, thus reducing the reliability of the test results. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a testing device for mold steel.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A testing device for mold steel includes an operating table with a connecting cover on top. A lifting mechanism for raising and lowering the connecting cover is also provided on the top of the operating table. Two L-shaped plates are symmetrically arranged on the top of the operating table, and a moving mechanism for moving the two L-shaped plates is also provided on the top of the operating table. A connecting box is fixed to the top of the connecting cover. A U-shaped plate is fixed to the middle of the inner sidewall of the connecting box. A thermoelectric cooler is fixed to the inner sidewall of the U-shaped plate. Multiple first fins are equidistantly fixed to the cold end of the thermoelectric cooler, and multiple second fins are equidistantly fixed to the hot end of the thermoelectric cooler. An air blowing mechanism for blowing air into the connecting box is provided on the top of the connecting cover. A testing mechanism for testing the bending resistance of the mold steel is provided inside the connecting cover. During use, this device, through the air blowing mechanism and the thermoelectric cooler, can simulate low-temperature and high-temperature environments to test the bending resistance of the mold steel under different temperature conditions, improving the comprehensiveness and reliability of the testing.

[0007] Preferably, the lifting mechanism includes four electric telescopic rods, which are respectively fixed at the four corners of the top of the operating platform. Support plates are fixed at the four corners of the outer wall of the connecting cover, and the telescopic ends of the four electric telescopic rods are respectively fixed to the four support plates. Driving the four electric telescopic rods in conjunction with the four support plates can drive the connecting cover to rise or fall.

[0008] Preferably, the moving mechanism includes two support plates, which are symmetrically fixed to one end of the top of the operating table. The inner sidewalls of the two support plates are rotatably connected to the same bidirectional lead screw. Two lead screw nuts are symmetrically sleeved on the sidewalls of the bidirectional lead screw, and both lead screw nuts are adapted to the bidirectional lead screw. The two lead screw nuts are respectively fixed to two L-shaped plates. A slide block is fixed to the other end of the top of the operating table. Two sliders are slidably connected to the top of the slide block, and the two sliders are respectively fixed to the other end of the two L-shaped plates. By rotating the bidirectional lead screw in conjunction with the two lead screw nuts and the two sliders, the two L-shaped plates are moved closer to each other. When both L-shaped plates are in close contact with the mold steel, the fixing is completed.

[0009] Preferably, the detection mechanism includes a hydraulic push rod, which is fixed at the top center of the connecting cover. A connecting plate is fixed to the output end of the hydraulic push rod. A pressure sensor is installed at the bottom center of the connecting plate. A U-shaped plate is fixed to the bottom of the connecting plate, and a column is inserted through the bottom center of the U-shaped plate. A circular block is fixed to the top of the column, and the circular block is located directly below the pressure sensor. An infrared sensor is installed near the bottom of one end of the inner wall of the connecting cover, and a receiver is installed on the inner wall of the slide block. The infrared sensor and receiver are horizontally positioned. Driving the hydraulic push rod causes the connecting plate to move downwards, which in turn causes the column to move downwards in conjunction with the U-shaped plate. When the bottom of the column contacts the top of the mold steel, the column stops descending, and the connecting plate continues to move downwards. At this time, the U-shaped plate moves downwards along the side wall of the column, thus activating the pressure sensing. As the device gradually approaches the circular block, the pressure sensor, electrically connected to the controller, generates a signal when it comes into contact with the block and is compressed. This signal is transmitted to the controller, which then transmits it to the terminal for processing and display. Meanwhile, the pressure on the mold steel gradually increases. When the mold steel deforms, its bottom bends. Because the infrared sensor is electrically connected to the controller, its infrared radiation is blocked when the bottom of the mold steel bends, preventing the receiver from receiving it. The infrared sensor then transmits a signal to the controller. Upon receiving the signal, the controller disconnects the power switch of the hydraulic push rod, preventing the connecting plate from moving downwards. The value displayed on the terminal at this point is the maximum bending resistance of the mold steel.

[0010] Preferably, the blowing mechanism includes a fan, which is fixed to one end of the top of the connecting cover. A three-way pipe is installed at the outlet of the fan. A first solenoid valve and a second solenoid valve are respectively installed on the outer walls of both ends of the three-way pipe. Both ends of the three-way pipe penetrate the inner wall of the connecting box, and the two ends are symmetrically distributed about the U-shaped plate. A first connecting pipe is installed through the outer wall of the connecting box near the multiple first fins, and the first connecting pipe is connected to the operating table. A third solenoid valve is installed on the outer wall of the first connecting pipe. A second connecting pipe is installed through the outer wall of the connecting box near the multiple second fins, and the second connecting pipe is connected to the operating table. A fourth solenoid valve is installed on the outer wall of the second connecting pipe. When the semiconductor cooling chip is energized, its cold end temperature drops rapidly, and its hot end temperature gradually rises. Simulating a low-temperature loop, the first and fourth solenoid valves are closed, and the second and third solenoid valves are opened. At this time, the fan is driven to blow air from the outside... Air enters the connecting box through a three-way pipe and the second solenoid valve, contacting multiple first fins and lowering its temperature. The cooled air then enters the operating table through the first connecting pipe and the third solenoid valve, further cooling the mold steel. After a period of time, the surface temperature of the mold steel drops to the set value, allowing for the testing of its bending resistance at low temperatures. Similarly, when simulating high temperatures, the second and third solenoid valves are closed, while the first and fourth solenoid valves are opened. At this time, outside air enters the connecting box through the three-way pipe and the first solenoid valve, contacting multiple second fins and raising its temperature. The hot air then enters the operating table through the second connecting pipe and the fourth solenoid valve, heating the mold steel. After a period of time, the surface temperature of the mold steel rises to the set value, allowing for the testing of its bending resistance at high temperatures. This method accurately reflects the actual performance of the mold steel under extreme conditions, improving the reliability of the test results.

[0011] Preferably, the outer side wall of the connecting cover has a mounting hole, and a transparent glass is fixed to the side wall of the mounting hole. Both outer side walls of the connecting cover have air outlets. The transparent glass allows workers to monitor the internal condition of the connecting cover and make adjustments as needed.

[0012] The beneficial effects of this utility model are as follows:

[0013] 1. During use, this device can simulate low and high temperature environments by using an air blowing mechanism in conjunction with a semiconductor cooling chip to test the bending resistance of mold steel under different temperature conditions, thereby improving the comprehensiveness and reliability of the test.

[0014] 2. By moving the two L-shaped plates closer together through the moving mechanism, the mold steel is clamped and fixed. When testing the bending resistance of the mold steel, the deformation of the mold steel under stress can be effectively captured by the combination of pressure sensor and infrared sensor, thereby obtaining its maximum bending resistance. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a mold steel testing device proposed in this utility model;

[0016] Figure 2 This is a schematic cross-sectional view of the connection box of the mold steel testing device proposed in this utility model;

[0017] Figure 3 This is a schematic diagram of the interior of the connecting cover of a mold steel testing device proposed in this utility model;

[0018] Figure 4 This is a schematic cross-sectional view of the connecting plate and U-shaped plate of the mold steel testing device proposed in this utility model;

[0019] Figure 5 This is a schematic diagram of the moving mechanism of a mold steel testing device proposed in this utility model.

[0020] In the diagram: 1. Control panel; 2. Connecting cover; 3. Connecting box; 4. Support plate; 5. Electric telescopic rod; 6. Transparent glass; 7. Air outlet; 8. Fan; 9. T-pipe; 10. First solenoid valve; 11. Second solenoid valve; 12. First connecting pipe; 13. Third solenoid valve; 14. Second connecting pipe; 15. Fourth solenoid valve; 16. U-shaped plate; 17. Semiconductor cooling chip; 18. First fin; 19. Second fin; 20. Infrared sensor; 21. Hydraulic push rod; 22. Connecting plate; 23. U-shaped plate; 24. Pressure sensor; 25. Column; 26. Circular block; 27. Support plate; 28. Two-way lead screw; 29. ​​Lead screw nut; 30. Slide seat; 31. Slider; 32. L-shaped plate; 33. Receiver. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Reference Figure 1 - Figure 5A testing device for mold steel includes an operating table 1, a connecting cover 2 on the top of the operating table 1, a lifting mechanism for raising and lowering the connecting cover 2, two L-shaped plates 32 symmetrically arranged on the top of the operating table 1, a moving mechanism for moving the two L-shaped plates 32, a connecting box 3 fixed on the top of the connecting cover 2, a U-shaped plate 16 fixed in the middle of the inner side wall of the connecting box 3, a semiconductor cooling chip 17 fixed on the inner side wall of the U-shaped plate 16, a plurality of first fins 18 fixed at equal distances at the cold end of the semiconductor cooling chip 17, and a plurality of second fins 19 fixed at equal distances at the hot end of the semiconductor cooling chip 17, an air blowing mechanism for blowing air into the connecting box 3 on the top of the connecting cover 2, and a testing mechanism for testing the bending resistance of the mold steel inside the connecting cover 2. During use, this device, through the air blowing mechanism in conjunction with the semiconductor cooling chip 17, can simulate low and high temperature environments to test the bending resistance of the mold steel under different temperature conditions, improving the comprehensiveness and reliability of the testing.

[0023] Furthermore, the lifting mechanism includes four electric telescopic rods 5, which are fixed at the four corners of the top of the operating platform 1. Support plates 4 are fixed at the four corners of the outer wall of the connecting cover 2, and the telescopic ends of the four electric telescopic rods 5 are fixed to the four support plates 4 respectively. Driving the four electric telescopic rods 5 in conjunction with the four support plates 4 can drive the connecting cover 2 to rise or fall.

[0024] Furthermore, the moving mechanism includes two support plates 27, which are symmetrically fixed to one end of the top of the operating table 1. The inner sidewalls of the two support plates 27 are rotatably connected to the same bidirectional lead screw 28. The sidewalls of the bidirectional lead screw 28 are symmetrically fitted with two lead screw nuts 29, and both lead screw nuts 29 are adapted to the bidirectional lead screw 28. The two lead screw nuts 29 are respectively fixed to two L-shaped plates 32. The other end of the top of the operating table 1 is fixed with a slide block 30. The top of the slide block 30 is slidably connected to two sliders 31, and the two sliders 31 are respectively fixed to the other end of the two L-shaped plates 32. By rotating the bidirectional lead screw 28 in conjunction with the two lead screw nuts 29 and the two sliders 31, the two L-shaped plates 32 are driven to move closer to each other. When both L-shaped plates 32 are in close contact with the mold steel, the fixing is completed.

[0025] Furthermore, the detection mechanism includes a hydraulic push rod 21, which is fixed to the top center of the connecting cover 2. A connecting plate 22 is fixed to the output end of the hydraulic push rod 21. A pressure sensor 24 is installed at the bottom center of the connecting plate 22. A U-shaped plate 23 is fixed to the bottom of the connecting plate 22, and a column 25 is inserted through the bottom center of the U-shaped plate 23. A circular block 26 is fixed to the top of the column 25, and the circular block 26 is located directly below the pressure sensor 24. An infrared sensor 20 is installed near the bottom of one end of the inner wall of the connecting cover 2, and a receiver 33 is installed on the inner wall of the slide block 30. The infrared sensor 20 and the receiver 33 are horizontally positioned. Driving the hydraulic push rod 21 causes the connecting plate 22 to move downwards, which in turn causes the column 25 to move downwards in conjunction with the U-shaped plate 23. When the bottom of the column 25 contacts the top of the mold steel, the column 25 stops descending, and the connecting plate 22 continues to move downwards. At this time, the U-shaped plate 23 moves along the side wall of the column 25... As the pressure sensor 24 moves downwards, it gradually approaches the circular block 26. Since the pressure sensor 24 is electrically connected to the controller, when the pressure sensor 24 and the circular block 26 come into contact and are compressed, the pressure sensor 24 generates a signal that is transmitted to the controller. After receiving the signal, the controller transmits it to the terminal for processing, so that it can be displayed as a specific value. At this time, the pressure on the mold steel gradually increases. When the mold steel deforms, the bottom of the mold steel will be bent. Since the infrared sensor 20 is electrically connected to the controller, when the bottom of the mold steel is bent, the infrared light emitted by the infrared sensor 20 will be blocked, so that its receiver 33 cannot receive the infrared light. At this time, the infrared sensor 20 will generate a signal that is transmitted to the controller. After receiving the signal, the controller disconnects the power switch of the hydraulic push rod 21, that is, the connecting plate 22 no longer moves downwards. The specific value displayed by the terminal at this time is the maximum bending resistance of the mold steel.

[0026] Furthermore, the air blowing mechanism includes a blower 8, which is fixed to one end of the top of the connecting cover 2. A three-way pipe 9 is installed at the outlet of the blower 8. A first solenoid valve 10 and a second solenoid valve 11 are respectively installed on the outer walls of both ends of the three-way pipe 9. Both ends of the three-way pipe 9 penetrate the inner wall of the connecting box 3, and are symmetrically distributed about the U-shaped plate 16. A first connecting pipe 12 is installed through the outer wall of the connecting box 3 near one end of the plurality of first fins 18, and the first connecting pipe 12 is connected to the operating table 1. A third solenoid valve 13 is installed on the outer wall of a connecting pipe 12. A second connecting pipe 14 is installed through one end of the outer wall of the connecting box 3 near one end of the multiple second fins 19, and the second connecting pipe 14 is connected to the operating table 1. A fourth solenoid valve 15 is installed on the outer wall of the second connecting pipe 14. After the semiconductor cooling chip 17 is energized, its cold end temperature drops rapidly and its hot end temperature gradually rises. When simulating a low-temperature environment, the first solenoid valve 10 and the fourth solenoid valve 15 are closed, and the second solenoid valve 11 and the third solenoid valve 13 are opened. At this time, the fan 8 is driven. Outside air enters the connecting box 3 through the three-way pipe 9 and the second solenoid valve 11, and comes into contact with multiple first fins 18, causing the air temperature to drop. The cold air then enters the operating table 1 through the first connecting pipe 12 and the third solenoid valve 13, cooling the mold steel. After a period of time, the surface temperature of the mold steel drops to the set value, allowing the bending resistance of the mold steel in its low-temperature state to be tested. Similarly, when simulating a high-temperature state, the second solenoid valve 11 and the third solenoid valve 13 are closed, and the first solenoid valve 10 and the fourth solenoid valve 15 are opened. At this time, outside air enters the connecting box 3 through the three-way pipe 9 and the first solenoid valve 10, and comes into contact with multiple second fins 19, causing the air temperature to rise. The hot air then enters the operating table 1 through the second connecting pipe 14 and the fourth solenoid valve 15, heating the mold steel. After a period of time, the surface temperature of the mold steel rises to the set value, allowing the bending resistance of the mold steel in its high-temperature state to be tested. This accurately reflects the actual performance of the mold steel under extreme conditions and improves the reliability of the test results.

[0027] Furthermore, the outer side wall of the connecting cover 2 is provided with mounting holes, and transparent glass 6 is fixed to the side wall of the mounting holes. Air outlets 7 are provided on both symmetrical outer side walls of the connecting cover 2. The transparent glass 6 allows workers to monitor the internal condition of the connecting cover 2 and make adjustments at any time.

[0028] Working Principle: During use, the mold steel to be tested is placed between two L-shaped plates 32. The two-way lead screw 28 is manually rotated, along with two lead screw nuts 29 and two sliders 31, to bring the two L-shaped plates 32 closer together. When both L-shaped plates 32 are in close contact with the mold steel, fixation is complete. Simultaneously, four electric telescopic rods 5, along with four support plates 4, move the connecting cover 2 downwards until it is in close contact with the top of the operating table 1. At this point, the power switch of the infrared sensor 20 is turned on. The infrared light emitted by the infrared sensor 20 is now at the same horizontal level as the bottom of the mold steel, and is received by the receiver 33. During detection, the power switch of the hydraulic push rod 21 is turned on, driving the hydraulic... The push rod 21 drives the connecting plate 22 to move downwards, which in turn drives the column 25 to move downwards in conjunction with the U-shaped plate 23. When the bottom of the column 25 contacts the top of the mold steel, the column 25 stops descending, and the connecting plate 22 continues to move downwards. At this time, the U-shaped plate 23 moves downwards along the side wall of the column 25, meaning the pressure sensor 24 gradually approaches the circular block 26. Since the pressure sensor 24 is electrically connected to the controller, when the pressure sensor 24 contacts the circular block 26 and generates pressure, the pressure sensor 24 generates a signal that is transmitted to the controller. After receiving the signal, the controller transmits it to the terminal for processing, so that it can be displayed with specific values. At this time, the mold steel is subjected to increasing compressive force. When the mold steel deforms, the bottom of the mold steel will bend. Due to infrared transmission... The infrared sensor 20 and the controller are electrically connected. When the bottom of the mold steel is bent, the infrared light emitted by the infrared sensor 20 will be blocked, preventing its receiver 33 from receiving the infrared light. At this time, the infrared sensor 20 will generate a signal and transmit it to the controller. After receiving the signal, the controller will disconnect the power switch of the hydraulic push rod 21, meaning that the connecting plate 22 will no longer move downwards. The specific value displayed on the terminal at this time is the maximum bending resistance of the mold steel. During the detection process, when it is necessary to simulate the external environment, the power switches of the ventilator 8 and the thermoelectric cooler 17 are turned on. After the thermoelectric cooler 17 is powered on, its cold end temperature drops rapidly, and its hot end temperature gradually rises. When simulating a low-temperature ring, the first solenoid valve 10 and the fourth solenoid valve 15 are closed, and the second solenoid valve 11 is turned on. With the third solenoid valve 13 in place, the drive fan 8 draws outside air into the connecting box 3 through the three-way pipe 9 and the second solenoid valve 11, where it comes into contact with multiple first fins 18, lowering the air temperature. The cold air then enters the operating table 1 through the first connecting pipe 12 and the third solenoid valve 13, cooling the mold steel. After a period of time, the surface temperature of the mold steel drops to the set value, allowing for the testing of the bending resistance of the mold steel at low temperatures. Similarly, when simulating a high-temperature state, the second solenoid valve 11 and the third solenoid valve 13 are closed, and the first solenoid valve 10 and the fourth solenoid valve 15 are opened. At this time, outside air enters the connecting box 3 through the three-way pipe 9 and the first solenoid valve 10, coming into contact with multiple second fins 19, raising the air temperature.Hot air enters the operating table 1 through the second connecting pipe 14 and the fourth solenoid valve 15, heating the mold steel. After a period of time, the surface temperature of the mold steel rises to the set value, allowing for bending resistance testing of the high-temperature mold steel. This accurately reflects the actual performance of the mold steel under extreme conditions, improving the reliability of the test results.

[0029] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A testing device for mold steel, comprising an operating table (1), characterized in that, The top of the operating table (1) is provided with a connecting cover (2), and the top of the operating table (1) is provided with a lifting mechanism for raising and lowering the connecting cover (2). The top of the operating table (1) is symmetrically provided with two L-shaped plates (32). The top of the operating table (1) is provided with a moving mechanism for moving the two L-shaped plates (32). The top of the connecting cover (2) is fixed with a connecting box (3). The middle of the inner side wall of the connecting box (3) is fixed with a U-shaped plate (16). The inner side wall of the U-shaped plate (16) is fixed with a semiconductor cooling chip (17). The cold end of the semiconductor cooling chip (17) is fixed with multiple first fins (18) at equal distances. The hot end of the semiconductor cooling chip (17) is fixed with multiple second fins (19) at equal distances. The top of the connecting cover (2) is provided with a blowing mechanism for blowing air into the connecting box (3). The inside of the connecting cover (2) is provided with a detection mechanism for detecting the bending resistance of the mold steel.

2. The testing device for mold steel according to claim 1, characterized in that, The lifting mechanism includes four electric telescopic rods (5), which are fixed at the four corners of the top of the operating table (1). Support plates (4) are fixed at the four corners of the outer wall of the connecting cover (2), and the telescopic ends of the four electric telescopic rods (5) are fixed to the four support plates (4).

3. The testing device for mold steel according to claim 1, characterized in that, The moving mechanism includes two support plates (27), which are symmetrically fixed to one end of the top of the operating table (1). The inner sidewalls of the two support plates (27) are rotatably connected to the same bidirectional lead screw (28). The sidewalls of the bidirectional lead screw (28) are symmetrically fitted with two lead screw nuts (29), and both lead screw nuts (29) are adapted to the bidirectional lead screw (28). The two lead screw nuts (29) are respectively fixed to two L-shaped plates (32). The other end of the top of the operating table (1) is fixed with a slide (30). The top of the slide (30) is slidably connected to two sliders (31), and the two sliders (31) are respectively fixed to the other end of the two L-shaped plates (32).

4. The testing device for mold steel according to claim 3, characterized in that, The detection mechanism includes a hydraulic push rod (21), which is fixed at the top center of the connecting cover (2). A connecting plate (22) is fixed at the output end of the hydraulic push rod (21). A pressure sensor (24) is installed at the bottom center of the connecting plate (22). A U-shaped plate (23) is fixed at the bottom of the connecting plate (22). A column (25) is installed through the bottom center of the U-shaped plate (23). A circular block (26) is fixed at the top of the column (25), and the circular block (26) is located directly below the pressure sensor (24). An infrared sensor (20) is installed at one end of the inner wall of the connecting cover (2) near the bottom. A receiver (33) is installed on the inner wall of the slide (30), and the infrared sensor (20) and the receiver (33) are arranged horizontally.

5. The testing device for mold steel according to claim 1, characterized in that, The blowing mechanism includes a blower (8), which is fixed to one end of the top of the connecting cover (2). A three-way pipe (9) is installed at the outlet of the blower (8). A first solenoid valve (10) and a second solenoid valve (11) are respectively installed on the outer walls of the two ends of the three-way pipe (9). Both ends of the three-way pipe (9) pass through the inner wall of the connecting box (3). The two ends of the three-way pipe (9) are symmetrically distributed about the U-shaped plate (16). A first connecting pipe (12) is provided through the outer wall of the connecting box (3) near the end of the multiple first fins (18). The first connecting pipe (12) is connected to the operating table (1). A third solenoid valve (13) is installed on the outer wall of the first connecting pipe (12). A second connecting pipe (14) is provided through the outer wall of the connecting box (3) near the end of the multiple second fins (19). The second connecting pipe (14) is connected to the operating table (1). A fourth solenoid valve (15) is installed on the outer wall of the second connecting pipe (14).

6. The testing device for mold steel according to claim 1, characterized in that, The outer side wall of the connecting cover (2) is provided with an installation hole, and a transparent glass (6) is fixed to the side wall of the installation hole. The two symmetrical outer side walls of the connecting cover (2) are provided with air outlets (7).

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