Steel plate secondary processing brittleness temperature detection device

Abstract

The utility model relates to the technical field of steel plate detection, in particular to a brittleness temperature detection device for secondary processing of a steel plate. The steel plate secondary processing brittleness temperature detection device comprises a drop hammer impact testing machine and a cooling device. The drop hammer impact testing machine comprises a base, a stand column, a drop hammer and a release mechanism. And the cooling device comprises a low-temperature tank for placing the sample cup so as to cool the sample cup. And a temperature detector is arranged on the drop hammer impact testing machine close to the base. The temperature detector is used for detecting the temperature of the sample cup placed on the base in real time. The drop hammer impact testing machine further comprises a controller, the controller is in communication connection with the temperature detector and a release mechanism for controlling the drop hammer to fall, and the controller controls the release mechanism according to a temperature signal transmitted by the temperature detector, so that the drop hammer automatically falls to impact the sample cup when the temperature of the base reaches a preset temperature. The test temperature of the sample cup can be truly reflected, the temperature of the sample cup can be detected in real time, and the detection result is accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of steel plate detection, in particular to a device for detecting the brittle temperature of a steel plate during secondary processing. Background Art

[0002] The secondary processing embrittlement test is a test used to determine the sensitivity of steel plates used for stamping to temperatures below 0°C. Existing drop hammer impact testing machines are mainly used to detect and analyze the secondary processing embrittlement characteristics of interstitial-free atom steels and phosphorus-reinforced steels used for stamping. After stamping, interstitial-free atom steels and phosphorus-reinforced steel plates have certain internal stresses. When subjected to external forces, especially impact forces under low temperature conditions, they are prone to fracture at the grain boundaries. Before conducting the secondary processing embrittlement test, the material needs to be processed into a cup-shaped specimen of a certain diameter and height, referred to as a sample cup, and the sample cup needs to be cooled to a temperature below 0°C. The sample cup is then impacted by the impact force generated by the free fall of a drop hammer. The biggest advantage of this test is that the measurement is quick and easy, and it can be achieved with only a cooling device and a drop hammer impact testing machine.

[0003] A drop-weight impact tester primarily consists of four components: a base, a column, a conical drop weight, and a release mechanism. Its operating principle is to place a cup sample, which has been held in a low-temperature bath for a specified period, on the base with the cup facing upward. A drop weight is then dropped from a height, impacting the sample with a specific energy. By continuously decreasing the drop weight test temperature until the sample breaks, the secondary processing brittleness temperature of the steel plate is determined. However, because this test measures the material's sensitivity to low-temperature impact, it is necessary to ensure that the sample cup temperature at the time of impact is within the allowable temperature fluctuation range to accurately measure the secondary processing brittleness of the steel plate. The impact test should be conducted within 3 seconds of removing the sample from the cooling bath. Therefore, a successful test requires addressing two key issues: sample centering—aligning the sample center and the drop weight center perpendicularly—and an impact time of 3 seconds or less. However, the relevant standard only addresses temperature fluctuations in the low-temperature bath and requires that the time between sample removal and impact should be within 3 seconds. Using the low-temperature bath temperature as the sample cup temperature at the time of impact results in an inaccurate secondary processing brittleness temperature.

[0004] In typical testing, specimen alignment relies primarily on the operator's vision, feel, and proficiency. Specimen alignment is difficult in such a short timeframe. Misaligned specimens can lead to inconsistent test results, ultimately invalidating the test. Either alignment is achieved but the test time exceeds the specified time limit, or alignment is achieved within a shorter timeframe but not achieved, ultimately invalidating the test.

[0005] The invention application with publication number CN116609208A discloses a test system and control method for ultra-low temperature impact testing that can realize timely and automatic temperature control. This system is also used in conjunction with a drop hammer tester. It only considers the temperature control accuracy of the cooling device and does not involve a method for controlling the temperature accuracy during subsequent impact tests. The utility model patent with publication number CN213842831U discloses a drop hammer impact tester for pipes with controllable low-temperature environment. This device can easily realize test temperature control, facilitate drop hammer impact testing of low-temperature pipes, and truly reflect their physical properties at the required test temperature. However, this tester integrates the drop hammer impact test device and the low-temperature refrigeration cabinet into one. Fragments flying out during the impact process can easily cause damage to the low-temperature refrigeration cabinet, and only one sample can be cooled at a time, resulting in low test efficiency.

[0006] Therefore, there is an urgent need to develop a steel plate secondary processing brittle temperature detection device with high test efficiency and accurate test temperature. Utility Model Content

[0007] In view of this, the present invention proposes a device for detecting brittle temperature of secondary processing of steel plates, which can at least solve the technical problems of inaccurate detection results and low test efficiency of existing drop hammer test devices.

[0008] The utility model discloses a device for detecting the brittleness temperature of steel plates during secondary processing, comprising a drop-weight impact tester and a cooling device. The drop-weight impact tester comprises a base for placing a sample cup cooled by the cooling device, a column, a drop weight, and a release mechanism for releasing the drop weight to cause it to fall. The cooling device comprises a low-temperature tank for placing the sample cup to cool it.

[0009] A temperature detector is also provided near the base of the drop weight impact tester to detect the temperature of the sample cup placed on the base in real time.

[0010] The drop hammer impact tester also includes a controller, which is in communication with a temperature detector and a release mechanism for controlling the drop of the drop hammer. The controller controls the release mechanism according to the temperature signal transmitted by the temperature detector, so that the drop hammer automatically falls and impacts the sample cup when the temperature of the base reaches a preset temperature.

[0011] In some embodiments, the drop weight impact testing machine is further equipped with a data acquisition system, which is in communication with the controller and the temperature detector and is used to record the temperature of the sample cup when the drop weight impacts the sample cup.

[0012] In some embodiments, a proximity switch is further provided under the base, and a clamping mechanism is further provided on the drop weight impact testing machine. The clamping mechanism includes a centering clamp and a servo located above the base. The centering clamp is configured to clamp the sample cup. The servo is installed on the drop weight impact testing machine and is communicatively connected to the proximity switch. The servo is configured to control the centering clamp to produce a clamping action and adjust the position of the centering clamp so that the center of the centering clamp is aligned with the center of the drop weight.

[0013] In some embodiments, the centering clamp includes two arc claws arranged opposite to each other, and one end of the two arc claws is connected to the operating part of the steering gear.

[0014] In some embodiments, a pressure sensor is provided on the base, and the pressure sensor is in communication with the data acquisition system for transmitting the pressure when the sample cup is impacted to the data acquisition system. The data acquisition system is further configured to record the pressure when the sample cup is impacted.

[0015] In some embodiments, safety gratings are further provided around the drop weight impact testing machine, and the switches of the safety gratings are communicatively connected with the controller.

[0016] In some embodiments, a circular mark is provided at the center of the upper surface of the base.

[0017] In some embodiments, the cooling device has four low-temperature tanks.

[0018] In some embodiments, a temperature sensor is provided in the low temperature tank.

[0019] In some embodiments, the drop weight impact testing machine is further provided with a timer, and the timer is communicatively connected to the data acquisition system.

[0020] The beneficial effects of the utility model are as follows: by arranging a temperature detector near the base on the drop hammer impact tester, the test temperature of the sample cup can be truly reflected, and the temperature of the sample cup can be detected in real time. When the sample cup reaches the set temperature, the drop hammer automatically falls to impact the sample, the reaction is rapid and sensitive, and the detection result is accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A logic diagram of a device for detecting brittle temperature during secondary processing of steel plates provided by one embodiment of the present utility model;

[0023] Figure 2 A schematic structural diagram of a base of a device for detecting brittle temperature of a steel plate during secondary processing according to an embodiment of the present invention;

[0024] Figure 3 This is a working flow chart of a device for detecting brittle temperature of steel plates during secondary processing provided by one embodiment of the present invention.

[0025] Description of reference numerals:

[0026] 1. Ultra-low temperature infrared thermometer; 2. Base; 3. Centering clamp; 4. Servo. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0028] The utility model provides a device for detecting the brittle temperature of secondary processing of steel plates, comprising a drop hammer impact tester and a cooling device. The drop hammer impact tester comprises a base 2 for placing a sample cup cooled by the cooling device, a column, a drop hammer, and a release mechanism for releasing the drop hammer to make it fall. The base 2 is usually made of cast steel to ensure sufficient strength and stability. The column is used to support the components of the equipment and fix the position of the equipment. The drop hammer is the part that directly impacts the sample. The release mechanism is a key part for controlling the drop of the drop hammer, and usually includes a hook, a hammer-off electromagnet, etc. When the electromagnet is actuated, the hook is driven to open, causing the drop hammer to fall. The cooling device comprises a low-temperature tank for placing the sample cup to cool the sample cup. The low-temperature tank has a set temperature. The sample cup is placed in the low-temperature tank and kept warm for 3 to 5 minutes, and can be cooled to the set temperature. In this embodiment, the set temperature is, for example, -52°C. In this application, the column, drop hammer, release mechanism and cooling device of the drop hammer impact tester are all prior art and are not shown in the figure.

[0029] like Figure 1 and Figure 2 As shown, a temperature detector is also installed near the base 2 of the drop weight impact tester. This temperature detector is used to monitor the temperature of the sample cup placed on the base 2 in real time. Specifically, the temperature detector can be, for example, an ultra-low temperature infrared thermometer 1 that uses a non-contact measurement method, avoiding the errors and interference that may be caused by traditional contact thermometers. This measurement method can more accurately reflect the temperature distribution on the surface of the sample cup.

[0030] The drop weight impact tester also includes a controller, which is in communication with the temperature detector and a release mechanism that controls the drop weight. Based on the temperature signal transmitted by the temperature detector, the controller controls the release mechanism, causing the drop weight to automatically drop and impact the sample cup when the temperature of base 2 reaches a preset temperature. Specifically, the preset temperature is 2-5°C lower than the set temperature of the low-temperature tank to ensure that the sample is not affected by the ambient temperature. In this embodiment, after removing the sample cup from the low-temperature tank, it is quickly placed on base 2. When the temperature detector detects that the sample cup temperature has reached -50°C, the release mechanism is controlled to release, causing the drop weight to automatically drop and impact the sample cup when the temperature of base 2 reaches the preset temperature.

[0031] Compared with the prior art, the present invention can truly reflect the test temperature of the sample cup and detect the temperature of the sample cup in real time by arranging a temperature detector near the base 2 on the drop hammer impact tester. When the sample cup reaches the set temperature, the drop hammer automatically falls to impact the sample, the response is rapid and sensitive, and the detection result is accurate.

[0032] In some embodiments, the drop weight impact tester is also equipped with a data acquisition system, which is in communication with the controller and temperature detector to record the temperature of the sample cup when the drop weight impacts it. The data acquisition system also measures and records parameters such as the sample cup's deformation during the impact, thus avoiding errors that may be introduced by manual recording. The coordinated operation of the controller and data acquisition system allows precise control of the drop weight's impact height, speed, and position, resulting in more accurate test results.

[0033] In some embodiments, a proximity switch (not shown) is further disposed beneath the base 2. This is a contactless switch that controls the on / off state of a circuit by sensing the proximity of an object. When an object approaches the switch's sensing surface to a certain distance, the switch activates, thereby driving a controller to provide control instructions. The drop weight impact tester is also equipped with a clamping mechanism comprising a centering clamp 3 and a servo 4 located above the base 2. The centering clamp 3 is configured to clamp the sample cup. The servo 4 is mounted on the drop weight impact tester and is in communication with the proximity switch. The servo 4 is configured to control the clamping action of the centering clamp 3 upon triggering the proximity switch and adjust the position of the centering clamp 3 so that the center of the centering clamp 3 is aligned with the center of the drop weight. Specifically, before the experiment, a precision measuring tool such as a caliper or gauge can be used to measure the distance from the center of the centering clamp 3 to the center of the drop weight to ensure that the two are completely aligned. Subsequently, the centering clamp 3 can adjust the sample cup to the same position during each test, ensuring consistent test conditions and enhancing the repeatability and comparability of test results. By automatically adjusting the position of the centering clamp 3, the center of the sample cup is ensured to be accurately aligned with the center of the drop weight, thereby reducing the test error caused by position deviation and improving the accuracy of the test results.

[0034] In some embodiments, as Figure 2As shown, the centering clamp 3 includes two opposing curved claws, one end of which is connected to the operating unit of the servo 4. The servo 4 controls the clamping and release of the sample cup by controlling the closing and opening of the two curved claws. The automated adjustment mechanism reduces the need for manual intervention, allowing the operator to complete sample cup positioning with simple settings, improving work efficiency and operational convenience.

[0035] In some embodiments, a pressure sensor is provided on the base 2. This pressure sensor can monitor and record the force applied to the sample cup during the impact process in real time, providing accurate data support for subsequent analysis. The pressure sensor is communicatively connected to a data acquisition system and is configured to transmit the pressure applied to the sample cup during the impact process to the data acquisition system. The data acquisition system is also configured to record the pressure applied to the sample cup during the impact process. Recording pressure data through the data acquisition system ensures data integrity and traceability.

[0036] In some embodiments, the drop weight impact tester is also equipped with safety gratings (not shown) around its perimeter. The safety grating's switch is communicatively connected to the controller. When the ultra-low temperature infrared thermometer 1 detects that the sample cup's measured temperature has risen to the test temperature of -50°C and the safety grating's switch is not triggered, the controller controls the drop weight's free fall to impact the sample cup, ensuring operator safety. If the safety grating's switch is triggered, indicating that the operator's hands or tools are still within the test area, the impact will occur if the temperature reaches the triggering condition, posing a risk of injury or test failure.

[0037] In some embodiments, a circular mark is provided at the center of the upper surface of the base 2. In addition, the base 2 can also be a circular plate, which is convenient for the operator to observe the positions of the centering clamp 3 and the sample cup to calibrate the centering clamp 3.

[0038] In some embodiments, the cooling device has four low-temperature tanks. This means that when testing the brittleness of steel plates with the same temperature gradient, four sample cups can be used simultaneously. Using multiple sample cups reduces the potential for random errors introduced by a single sample cup. By comparing the test results from multiple sample cups, the brittleness of the steel plate can be more accurately assessed. If the test results from all sample cups are consistent, the results can be considered reliable with greater confidence. Conversely, if the results vary significantly, further investigation may be necessary to determine if there is a problem with the testing process or the sample cups themselves.

[0039] In some embodiments, a temperature sensor is provided in the low-temperature tank for detecting the temperature in the low-temperature tank.

[0040] In some embodiments, the drop weight tester is also equipped with a timer, which is in communication with the data acquisition system and can accurately measure the time interval from the start of the drop weight's descent to the impact of the sample cup. This precise time recording can provide a better understanding of the material's behavior and performance during the instantaneous impact.

[0041] The working principle and working method of the steel plate secondary processing brittle temperature detection device proposed in this utility model can be found in Figure 3 Flowchart: At the beginning of the experiment, set the temperature of the low-temperature tank. If the test temperature of the sample cup is -50°C, set the temperature of the low-temperature tank of the cooling device to -52°C. When the temperature of the low-temperature tank reaches -52°C, place four sample cups in the low-temperature tank of the cooling device and keep them warm for 5 minutes. Then quickly transfer one sample cup to the base 2 of the drop weight impact tester. After the proximity switch installed on the base 2 is triggered, the sample cup centering clamp 3 quickly adjusts the position of the sample cup so that the center of the sample cup is aligned with the center of the drop weight. Wait until the measured temperature of the sample cup rises to the test temperature of -50°C. When the switch of the safety grating is not triggered, the drop weight freely falls to impact the sample cup. At the moment of impact, the drop weight impact tester records the sample cup temperature through the data acquisition system. If the actual temperature at the time of impact is within the range of -50°C ± 1°C, the test is valid. Continue to impact the next three sample cups. If the actual temperature during impact is not within the range of -50℃±1℃, add one more sample cup until the temperatures of the four sample cups during impact are within the range of -50℃±1℃. The number of sample cups for this temperature gradient meets the requirement. Then, continue to the next temperature gradient test or end the test based on the results of the sample cups.

[0042] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0043] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A device for detecting brittle temperature of secondary processing of steel plates, comprising a drop hammer impact tester and a cooling device; the drop hammer impact tester comprises a base (2) for placing a sample cup cooled by the cooling device, a column, a drop hammer, and a release mechanism for releasing the drop hammer to make it fall; the cooling device comprises a low-temperature tank for placing the sample cup to cool the sample cup, characterized in that: A temperature detector is also provided on the drop weight impact tester at a position close to the base (2); the temperature detector is used to detect the temperature of the sample cup placed on the base (2) in real time; The drop weight impact testing machine further includes a controller, which is communicatively connected with the temperature detector and the release mechanism.

2. The steel plate secondary processing brittle temperature detection device according to claim 1, characterized in that: The drop weight impact testing machine is further equipped with a data acquisition system, which is communicatively connected with the controller and the temperature detector.

3. The steel plate secondary processing brittle temperature detection device according to claim 1, characterized in that: A proximity switch is further provided below the base (2), and a clamping mechanism is further provided on the drop weight impact tester. The clamping mechanism comprises a centering clamp (3) and a steering gear (4) located above the base (2). The centering clamp (3) is configured to clamp the sample cup. The steering gear (4) is installed on the drop weight impact tester and is communicatively connected to the proximity switch. The steering gear (4) is configured to control the centering clamp (3) to produce a clamping action and adjust the position of the centering clamp (3) so that the center of the centering clamp (3) is aligned with the center of the drop weight.

4. The steel plate secondary processing brittle temperature detection device according to claim 3, characterized in that: The centering clamp (3) comprises two arc claws arranged opposite to each other, and one end of the two arc claws is connected to the operating part of the steering gear (4).

5. The steel plate secondary processing brittle temperature detection device according to claim 2, characterized in that: A pressure sensor is provided on the base (2), and the pressure sensor is in communication connection with the data acquisition system and is used to transmit the pressure when the sample cup is impacted to the data acquisition system; the data acquisition system is also configured to record the pressure when the sample cup is impacted.

6. The steel plate secondary processing brittle temperature detection device according to claim 1, characterized in that: Safety gratings are also provided around the drop weight impact testing machine, and the switches of the safety gratings are communicatively connected with the controller.

7. The steel plate secondary processing brittle temperature detection device according to claim 1, characterized in that: A circular mark is provided at the center of the upper surface of the base (2).

8. The steel plate secondary processing brittle temperature detection device according to claim 1, characterized in that: The cooling device has four low-temperature tanks.

9. The steel plate secondary processing brittle temperature detection device according to claim 1, characterized in that: A temperature sensor is provided in the low-temperature tank.

10. The steel plate secondary processing brittle temperature detection device according to claim 2, characterized in that: The drop weight impact testing machine is also provided with a timer, which is in communication connection with the data acquisition system.

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