High-temperature furnace overheating protection device for high-temperature fatigue test transformation

Abstract

The invention relates to test equipment, and aims to provide a high-temperature furnace overheating protection device for high-temperature fatigue test transformation, which has the function of realizing automatic power-off and heating stopping of a high-temperature furnace after a fatigue test is finished or a thermocouple of a fatigue sample is separated from the high-temperature furnace. And the device has the characteristics of simple structure, convenience in use, low improvement cost and high automation degree. The technical scheme is a high-temperature furnace overheating protection device for high-temperature fatigue test transformation. The protection device is characterized by comprising a first high-temperature furnace temperature thermocouple, a second high-temperature furnace temperature thermocouple, a test temperature measurement signal input line, a protection device main control board, a power output relay, a protection device power supply module, a power output module and a protection device control panel. The protection device control panel is used for outputting a set temperature difference range signal to the protection device main control board; an indicating lamp and an operation button are arranged on the protection device control panel and used for displaying the current working state and setting the temperature difference range.

Description

Technical Field

[0001] The invention relates to a test device, in particular to an overheat protection device for high temperature fatigue test modification. Background Art

[0002] With the continuous development of materials science, the research requirements for material fatigue tests under high temperature conditions in the fields of aerospace, nuclear power, special equipment, etc. are increasing. These fields have put forward higher requirements on the performance of high temperature furnaces of fatigue testing machines, and there is an urgent need to meet more complex and strict test conditions. However, the overall transformation and upgrading of existing equipment is often costly. At present, the commonly used transformation scheme is to separate the test system from the temperature control system. Although this method is feasible, after the fatigue test is completed, the temperature control system cannot sense the test status in real time. Especially after the specimen breaks, the thermocouple on the surface of the specimen may be separated from the high temperature furnace, causing the temperature control system to misjudge, and then the high temperature furnace continues to heat at high power. If there is a lack of personnel on duty at this time, it may cause safety hazards such as fire. Therefore, based on the actual detection test needs, it is urgent to develop a high temperature furnace overheating protection device suitable for such modified high temperature fatigue testing machines to ensure the temperature control safety and normal operation of the equipment during the test. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the above-mentioned background technology and provide a high-temperature furnace overheating protection device for high-temperature fatigue test modification, which has the function of automatically cutting off the power and stopping heating of the high-temperature furnace after the fatigue test is completed or the thermocouple of the fatigue specimen is out of the high-temperature furnace, and has the characteristics of simple structure, easy use, low modification cost and high degree of automation.

[0004] The technical solution adopted by the present invention is:

[0005] A high temperature furnace overheat protection device for high temperature fatigue test modification, characterized in that the protection device comprises: a first high temperature furnace temperature measuring thermocouple, a second high temperature furnace temperature measuring thermocouple, a test temperature measurement signal input line, a protection device main control board, a power output relay, a protection device power supply module, a power output module, and a protection device control panel. The first high temperature furnace temperature measuring thermocouple and the second high temperature furnace temperature measuring thermocouple are inserted into the high temperature furnace to measure the real-time temperature in the high temperature furnace, the test temperature measurement signal input line is connected to the sample to read the temperature of the fatigue sample, the protection device main control board is used to compare the temperature difference signal between the fatigue sample temperature and the temperature in the high temperature furnace, the power output module is connected to the high temperature furnace power supply line to control the power supply of the high temperature furnace, when it is detected that the sample temperature is too low and the temperature difference with the high temperature furnace is too large, the power output is cut off through the power output relay, and the fire hazard caused by the abnormal high power continuous heating of the high temperature furnace temperature control detection when the thermocouple on the surface of the fatigue sample is out of the high temperature furnace at the end of the high temperature fatigue test; the protection device control panel is used to output the set temperature difference range signal to the protection device main control board; the protection device control panel is provided with an indicator light and an operation button to display the current working state and set the temperature difference range.

[0006] Preferably, in the high temperature furnace overheat protection device, the design of the high temperature furnace overheat protection device does not require any changes to the mechanical structure, electrical circuit and control system of the fatigue testing machine. Through this design, the modification cost of the high temperature fatigue testing system is greatly reduced, and the possible equipment compatibility issues and complex technical adjustments are also avoided.

[0007] Preferably, in the power output module of the protection device, the power output line is connected to the power supply line of the high-temperature furnace. This design can automatically cut off the external power supply of the high-temperature furnace in an emergency, and does not rely on the modification of the electrical system inside the high-temperature furnace. This solution not only avoids structural modifications to existing equipment, but also ensures the stability of the operation of the high-temperature furnace system, effectively reducing the modification cost.

[0008] Preferably, a microprocessor is used in the main control board of the protection device to accurately calculate and control the triggering conditions of temperature difference and power cut-off, and can respond quickly and automatically cut off the power when an abnormal temperature difference occurs, thereby ensuring the safety of the high-temperature furnace system. Even when the equipment is running for a long time, it can still maintain a stable and reliable protection function, effectively preventing safety accidents caused by system failures.

[0009] Preferably, the protection device has a modular design and can be quickly installed and integrated with existing equipment without the need for complicated installation procedures or frequent maintenance operations. Operators can easily master how to use it, reducing equipment maintenance costs and technical training costs.

[0010] The beneficial effects of the present invention are as follows: The present invention monitors the temperature difference between the high-temperature furnace and the sample in real time through the high-temperature furnace temperature measuring thermocouple and the sample temperature measuring signal input line. When the temperature difference is abnormal, the power supply is automatically cut off through the power output relay. The device does not need to modify the mechanical structure and electrical system of the existing high-temperature fatigue testing machine, and has a simple structure and is easy to use. By automatically cutting off the power supply, the risk of the high-temperature furnace misjudging continuous heating is avoided, and the safety of the system is improved. At the same time, the device has a high degree of automation, reduces the cost of transformation, and improves the stability and service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural diagram of embodiment 1 of the present invention.

[0012] Figure 2 It is a schematic diagram of the internal module distribution of Example 1 of the present invention.

[0013] Figure 3 It is a schematic diagram of the installation of thermocouples in a high-temperature furnace of the fatigue specimen of Example 1 of the present invention.

[0014] Figure 4 It is a schematic diagram of the working principle of embodiment 1 of the present invention.

[0015] Figure 5 This is a schematic diagram of the working logic of Example 1 of the present invention.

[0016] Numbers in the figure: high temperature furnace temperature measuring thermocouple 1, first high temperature furnace temperature measuring thermocouple 1-1, second high temperature furnace temperature measuring thermocouple 1-2, high temperature CT stretching tool 2, high temperature CT stretching tool upper end 2-1, high temperature CT stretching tool lower end 2-2, high temperature furnace 3, high temperature furnace inner wall 3-1, fatigue testing machine 4, test temperature measurement signal input line 5, upper temperature measuring thermocouple 5-1, middle temperature measuring thermocouple 5-2, lower temperature measuring thermocouple 5-3, fatigue testing machine computer 6, overheating protection device 7, protection device main control board 7-1, protection device control panel 7-2, protection device power supply module 7-3, power output relay 7-4, power output module 7-5, high temperature furnace temperature controller 8, fatigue testing machine controller 9, fatigue specimen 10, fracture specimen upper section 10-1, fracture specimen lower section 10-2, signal line 11. DETAILED DESCRIPTION

[0017] The present invention will be further described below, but the present invention is not limited to the following examples.

[0018] Figure 1 The high temperature fatigue testing machine shown includes:

[0019] A high temperature CT tensile tool 2 for mounting a specimen 10 for a fatigue test;

[0020] The heating component is powered by external power through the power input line of the high-temperature furnace to heat the heating component, thereby heating and keeping the sample in the high-temperature furnace warm, so that the sample reaches the set test temperature, and then the fatigue testing machine works to stretch the fatigue sample 10 through the high-temperature CT stretching tool to complete the fatigue test in a high-temperature environment;

[0021] A high temperature furnace temperature controller 8, used to control the temperature target value of the high temperature furnace and the heating and insulation process;

[0022] The fatigue testing machine controller 9 is used to control the operation of the fatigue testing machine and convert the signal from the computer into the equipment operation instruction.

[0023] The above is similar to the existing high temperature fatigue testing machine.

[0024] The improvement of the present invention is that an overheat protection device for a high temperature furnace used for high temperature fatigue test modification is added, which is composed of the following components:

[0025] The high temperature furnace temperature measuring thermocouple 1 comprises a first high temperature furnace temperature measuring thermocouple 1-1 and a second high temperature furnace temperature measuring thermocouple 1-2 respectively installed at the upper end and the lower end of the inner wall 3-1 of the high temperature furnace, and is used to measure the temperature inside the high temperature furnace in real time;

[0026] The test temperature measurement signal input line 5 includes signal lines respectively drawn from the temperature measurement thermocouple 5-1 on the sample, the middle temperature measurement thermocouple 5-2 and the lower temperature measurement thermocouple 5-3, and is used to measure the surface temperature of the fatigue sample and transmit the sample temperature to the high temperature furnace control temperature controller 8 and the overheating protection device 7;

[0027] The power output relay is connected between the protection device power supply module and the power output module, and has normally open and normally closed states. When the temperature difference exceeds the set value, it switches to the normally open state to cut off the power supply, and restores the power supply in the normally closed state.

[0028] The overheat protection device 7 compares the temperature difference between the internal temperature of the high-temperature furnace and the surface temperature of the fatigue specimen; when the temperature difference exceeds the set maximum allowable value, the overheat protection device cuts off the external power supply of the high-temperature furnace to avoid the fire hazard caused by long-term high-power heating.

[0029] like Figure 2As shown, the overheat protection device includes a power supply module 7-3, a power output relay 7-4, a power output module 7-5, a protection device main control board 7-1 and a protection device control panel 7-2; the protection device power supply module 7-3 is connected between the external power and the protection device power supply module for power distribution and protection; a part of the power is used for the power supply protection device itself, and the other part is transmitted to the high temperature furnace through the power output relay 7-4 and the power output module 7-5 (the power output module is connected between the power output relay and the power input line of the high temperature furnace). The first high temperature furnace temperature measuring thermocouple 1-1 and the second high temperature furnace temperature measuring thermocouple 1-2 transmit the high temperature furnace temperature to the overheat protection device 7 through the signal line 11, and the temperature measurement signal input line 5 transmits the fatigue specimen surface temperature signal to the protection device main control board 7-1; the protection device main control board receives these signals and performs temperature difference calculation. The protection device control panel 7-2 is used to set the allowable temperature difference range. When the temperature difference exceeds the set maximum allowable value, the protection device main control board 7-1 outputs a signal to instruct the power output relay 7-4 to disconnect the power supply, and the power output module 7-5 stops supplying power to the outside, thereby cutting off the power supply to the high-temperature furnace to prevent the risk of fire due to overheating.

[0030] like Figure 3 As shown, the first high temperature furnace temperature measuring thermocouple 1-1 is installed at the upper end of the high temperature furnace inner wall 3-1, and the second high temperature furnace temperature measuring thermocouple 1-2 is installed at the lower end of the high temperature furnace inner wall. The two temperature measuring thermocouples jointly obtain the real-time temperature of the high temperature furnace cavity. The test temperature measurement signal input line 5 is connected to multiple temperature measuring thermocouples (upper temperature measuring thermocouple 5-1, middle temperature measuring thermocouple 5-2, lower temperature measuring thermocouple 5-3) to detect the surface temperature of the fatigue specimen; at the same time, the fatigue testing machine body 4 controls the upper end 2-1 of the high temperature CT stretching tool and the lower end 2-2 of the high temperature CT stretching tool to apply force to the fatigue specimen 10 to perform fatigue testing.

[0031] like Figure 4 As shown, after the fatigue test is completed, the thermocouples (upper temperature measuring thermocouple 5-1, middle temperature measuring thermocouple 5-2, lower temperature measuring thermocouple 5-3) connected to the test temperature measuring signal input line 5 may fall out of the high temperature furnace due to the pulling force. At this time, the traditional control system may misjudge due to the large temperature deviation and continue to heat the high temperature furnace at the maximum power, causing the temperature to exceed 1200℃. The fatigue test usually lasts for a long time, and real-time monitoring cannot be performed during the test, which poses a risk of causing a fire.

[0032] like Figure 5As shown, the working logic of the overheating protection device is as follows: after starting up, the protection device first resets the power output relay 7-4 to the normally closed position and connects the high-temperature furnace to the power supply. Subsequently, the protection device main control board 7-1 determines whether the first high-temperature furnace temperature measuring thermocouple 1-1 and the second high-temperature furnace temperature measuring thermocouple 1-2 are working normally, and detects the signal of the test temperature measurement signal input line. If the signal is normal, the protection device will calculate the temperature difference between the temperature inside the high-temperature furnace and the surface of the sample, and compare it with the preset maximum allowable temperature difference. When the temperature difference exceeds the maximum value, the protection device main control board 7-1 sends a power-off signal, the power output relay 7-4 is disconnected, and the external power supply of the high-temperature furnace is cut off to achieve overheating protection.

[0033] Finally, it should be noted that the above examples are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above examples, and many variations are possible. All variations that can be directly derived or associated with the content disclosed by a person skilled in the art should be considered as the protection scope of the present invention.

Claims

1. A high temperature furnace overheat protection device for high temperature fatigue test modification, characterized in that: The protection device includes: The high temperature furnace temperature measuring thermocouple comprises a first high temperature furnace temperature measuring thermocouple (1-1) and a second high temperature furnace temperature measuring thermocouple (1-2), which are used to measure the temperature in the high temperature furnace in real time; The test temperature measurement signal input line (5) comprises signal lines respectively led out from an upper temperature measurement thermocouple (5-1), a middle temperature measurement thermocouple (5-2) and a lower temperature measurement thermocouple (5-3) on the sample, and is used to obtain surface temperature signals of different parts of the sample; The protection device main control board (7-1) is used to receive and process the temperature signal inside the high-temperature furnace outputted by the first high-temperature furnace temperature measuring thermocouple and the second high-temperature furnace temperature measuring thermocouple through the signal line (11), receive and process the sample surface temperature signal obtained by the temperature measuring signal input line (5), receive and process the control signal inputted by the protection device control panel (7-2), and output a control signal to the power output relay (7-4) to disconnect the power supply according to the temperature difference between the temperature inside the high-temperature furnace and the surface temperature of the sample; A protection device power supply module (7-3), connected between external power and the protection device power supply module, for providing power to the protection device; The power output relay (7-4) is connected between the power supply module of the protection device and the power output module, and cuts off the external power supply of the high temperature furnace when the temperature difference exceeds the set value; A power output module (7-5), connected between the power output relay and the power input line of the high temperature furnace, for controlling the power input of the high temperature furnace; The protection device control panel (7-2) is used to output a set temperature difference range signal to the protection device main control board.

2. The high temperature furnace overheat protection device for high temperature fatigue test modification according to claim 1 is characterized in that: The first high temperature furnace temperature measuring thermocouple and the second high temperature furnace temperature measuring thermocouple are respectively installed at the upper end and the lower end of the inner wall (3-1) of the high temperature furnace, and are used to obtain real-time temperature data and transmit it to the main control board of the protection device.

3. The high temperature furnace overheat protection device for high temperature fatigue test modification according to claim 2 is characterized in that: The upper temperature measuring thermocouple (5-1), the middle temperature measuring thermocouple (5-2) and the lower temperature measuring thermocouple (5-3) are respectively installed on the sample from top to bottom, and are connected to the main control board of the protection device through signal lines (11) respectively, so as to measure and transmit the surface temperature of the tested sample in real time.

4. The high temperature furnace overheat protection device for high temperature fatigue test modification according to claim 3 is characterized in that: The protection device main control board has a built-in microprocessor for accurately calculating and controlling the triggering conditions of temperature difference and power cut-off, and judging the temperature difference between the high-temperature furnace and the surface temperature of the sample according to the set maximum allowable temperature difference value, and controlling the power output relay to cut off the power supply when the temperature difference exceeds the predetermined range.

5. The high temperature furnace overheat protection device for high temperature fatigue test modification according to claim 4 is characterized in that: The power output relay has a normally open state and a normally closed state. The power supply is cut off in the normally open state, and the power supply is restored in the normally closed state.

6. The high temperature furnace overheat protection device for high temperature fatigue test modification according to claim 5 is characterized in that: The protection device control panel is provided with indicator lights and operation buttons for displaying the current working state and setting the temperature difference range.

7. The high temperature furnace overheat protection device for high temperature fatigue test modification according to claim 6 is characterized in that: The power output module is connected to the power input line of the high temperature furnace through a power output relay, and automatically cuts off the power supply when a fault or over-temperature occurs.

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