Cold and hot impact fatigue test device
By adopting the design of a mobile switching mechanism and a water bath in the hot and cold shock fatigue testing device, the test specimen can be quickly switched between high and low temperature environments, solving the problems of the small temperature change range and long switching time of the existing test chamber, and improving the test efficiency.
Patent Information
- Application Number
- CN202422680158.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-04
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-11-04
AI Technical Summary
The existing thermal shock test chambers have a small temperature change range and a long switching time, which makes it difficult to meet the efficiency requirements of a large number of thermal shock tests.
A thermal shock fatigue testing device is designed. It adopts two temperature control devices and a mobile switching mechanism. The lifting components are moved in the horizontal and vertical directions to achieve rapid switching between high and low temperature environments of the test specimen. The temperature is controlled by a water bath.
It achieves a wider temperature change range and faster temperature switching speed, improves test efficiency, and is suitable for high-frequency thermal shock fatigue testing.
Smart Images
Figure CN223485744U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of material performance testing technology, and in particular to a thermal shock fatigue testing device. Background Technology
[0002] Many critical components in equipment or systems require materials with excellent resistance to thermal shock. For example, materials such as the frame membrane, proton exchange membrane, ceramic bipolar plate, and graphite bipolar plate in proton exchange membrane fuel cells need to undergo extensive thermal shock testing to verify their reliable resistance to thermal shock.
[0003] Thermal shock test chambers are widely used in the metal, plastic, rubber, and electronics industries to test the thermal shock resistance of material structures or composite materials. The test specimens are placed in a continuous and rapid switching environment of extremely high and extremely low temperatures created by the thermal shock test chamber to check the material's tolerance, so as to detect the chemical changes or physical damage caused by thermal expansion and contraction of the test specimens in the shortest possible time.
[0004] Existing thermal shock test chambers all employ a reverse Carnot cycle for refrigeration, which consists of two isothermal processes and two adiabatic processes. The process is as follows: The refrigerant is adiabatically compressed to a higher pressure by the compressor, consuming work and raising the exhaust temperature. Then, the refrigerant isothermally exchanges heat with the surrounding medium through the condenser, transferring heat to the surrounding medium. Next, the refrigerant adiabatically expands through a valve, doing work, and its temperature decreases. Finally, the refrigerant isothermally absorbs heat from the hotter object through the evaporator, lowering the temperature of the object being cooled. This cycle repeats continuously to achieve the purpose of cooling.
[0005] The thermal shock test chamber using the aforementioned cold cycling method has a high manufacturing cost, and its temperature change range is typically between -60℃ and 200℃, with a temperature switching time of more than 15 seconds. This results in a small temperature change range and a long temperature switching time. In actual thermal shock tests, temperature switching typically exceeds 10,000 cycles, and the long temperature switching cycle significantly impacts test efficiency, making it difficult to handle a large number of test tasks. Utility Model Content
[0006] In view of this, the present invention aims to provide a thermal shock fatigue testing device, which provides a driving mechanism scheme for smoothly moving the test specimen between two temperature control chambers.
[0007] To achieve the above objectives, the technical solution of this utility model is implemented as follows:
[0008] A thermal shock fatigue testing device includes a base frame, a movable switching mechanism disposed on the base frame, and a first temperature control device and a second temperature control device disposed at intervals below the movable switching mechanism.
[0009] Both the first and second temperature control devices have open tops, and the test sample is suspended on the moving switching mechanism. The moving switching mechanism can drive the test sample to move back and forth above the first and second temperature control devices, and can drive the test sample to move up and down to enter or exit the first or second temperature control device.
[0010] Furthermore, both the first and second temperature control devices are water baths, each containing a liquid that can be controlled at different set temperatures, allowing the test sample to be completely immersed in the liquid.
[0011] Furthermore, the moving switching mechanism includes a hoisting assembly capable of horizontally reciprocating above the first temperature control device and the second temperature control device; the hoisting assembly includes a driveable rotating take-up reel and a hoisting line wound on the take-up reel; the test sample is attached to the end of the hoisting line.
[0012] Furthermore, the hoisting assembly moves horizontally reciprocating under the drive of a linear cylinder or a linear motor, and the winding reel rotates under the drive of a rotary motor.
[0013] Furthermore, the moving switching mechanism also includes a drive motor fixed on the base frame, a screw rotating under the drive of the drive motor, and a guide rail arranged parallel above the screw. The hoisting assembly slides along the guide rail. The guide rail is provided with a first test position and a second test position located directly above the first temperature control device and the second temperature control device, respectively. The hoisting assembly is screwed and driven to the screw. As the screw rotates, the hoisting assembly can reciprocate between the first test position and the second test position.
[0014] Furthermore, a clamping mechanism is provided between the hoisting assembly and the screw, and a clearance structure is provided at both the first test position and the second test position; when the hoisting assembly reaches the first test position or the second test position, the clamping mechanism can be manipulated to clamp the hoisting assembly onto the screw, and the clearance structure can be manipulated to disengage the hoisting assembly from the guide rail, so that the winding wheel rotates synchronously with the screw at the first test position or the second test position.
[0015] Furthermore, the avoidance structure includes an avoidance groove formed on the guide rail and an avoidance block slidably disposed in the avoidance groove; the hoisting assembly has a guide disc fixed to one side of the winding reel, and a sliding groove is provided on the circumferential surface of the guide disc to slide in cooperation with the guide rail; when the hoisting assembly reaches the first test position or the second test position, the guide disc slides into the avoidance groove, and the avoidance block can be manipulated to move upward to disengage from the sliding groove, or move downward into the sliding groove.
[0016] Furthermore, the clearance block is equipped with a detection device for detecting whether the guide plate has entered the clearance groove.
[0017] Furthermore, it also includes a control unit, and the drive motor, the detection device, and the drive components of the avoidance block and the clamping mechanism are all connected to the control unit.
[0018] Furthermore, the clamping mechanism includes a gripper fixed to the guide disc on the side opposite to the take-up reel, the gripper being operable to clamp the screw; the contact portion between the gripper and the screw is provided with a soft pad.
[0019] Compared with the prior art, this utility model has the following advantages:
[0020] This utility model discloses a thermal shock fatigue testing device. By setting two temperature control devices, the internal temperature of the two temperature control devices can be controlled under two different temperature conditions: high and low. A moving switching mechanism drives the test sample to move horizontally back and forth above the first and second temperature control devices. Then, by moving up and down, the test sample enters the first or second temperature control device, completing the movement and switching of the test sample between the first and second temperature control devices. This allows the test sample to smoothly switch between high and low temperature environments frequently, so as to realize the thermal shock fatigue test of the test sample. Thus, it provides a driving mechanism scheme for smoothly moving the test sample between two temperature control devices.
[0021] In addition, both temperature control devices are in the form of water baths. The heating or cooling devices configured in the water baths can control the liquid in the water baths at the required temperature. The test sample is immersed in liquids of two different temperatures to achieve switching between different temperature conditions, which is more conducive to the rapid heat transfer between the liquid and the test sample. This allows the test sample to approach the temperature of the liquid more quickly, resulting in better thermal shock fatigue testing of the test sample.
[0022] Furthermore, by setting up guide rails and using a drive motor to rotate the screw, the horizontal movement of the lifting assembly can be achieved through the screw transmission structure. Simultaneously, by incorporating a clearance structure and a clamping mechanism, the lifting assembly can be fixed to the screw, causing the winding reel to rotate with the screw. In this way, a single drive unit with a drive motor can achieve both horizontal and vertical movement of the sample under test, reducing the number of drive units required. Moreover, the screw-driven translation method between the screw and the lifting assembly features smooth and reliable operation. Attached Figure Description
[0023] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model. The directional terms such as front / back, up / down, etc., used therein are only used to indicate relative positional relationships and do not constitute an improper limitation of this utility model. In the drawings:
[0024] Figure 1 This is a schematic diagram of the overall structural configuration of the thermal shock fatigue testing device described in this embodiment of the present invention;
[0025] Figure 2 for Figure 1 A magnified view of part A in the middle when the hoisting assembly is translated to the clearance groove by the rotation of the screw.
[0026] Figure 3 for Figure 2 The schematic diagram of the component shown is shown in the state where the guide plate rotates synchronously with the screw after the clearance block moves upward;
[0027] Figure 4 This is a schematic diagram illustrating the overall process of the thermal shock fatigue testing device described in this embodiment of the invention, which drives the test specimen to move and switch between the first temperature control device and the second temperature control device.
[0028] Explanation of reference numerals in the attached figures:
[0029] 1. Base frame; 20. Drive motor; 21. Screw; 22. Lifting assembly; 220. Winding reel; 221. Guide disc; 222. Clamping mechanism; 23. Lifting line;
[0030] 3. Guide rail; 30. Clearance groove; 300. Clearance block; 301. Detection device; 31. First test position; 32. Second test position;
[0031] 4. Test sample; 5. First temperature control device; 6. Second temperature control device. Detailed Implementation
[0032] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.
[0033] In the description of this utility model, it should be stated that if terms such as "upper," "lower," "left," "right," "front," "back," "inner," and "outer" appear, they are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0034] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, a connection 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 a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances. The limiting terms such as "first," "second," "A," "B," "C," and "D" appearing in the description of this utility model are merely for distinguishing similar features in different locations, attributions, or uses, in order to avoid ambiguity and confusion, and should not be construed as indicating or implying relative importance.
[0035] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0036] Example 1
[0037] This embodiment relates to a thermal shock fatigue testing device, providing a driving mechanism scheme for smoothly moving the test specimen 4 between two temperature control chambers; one exemplary structure is as follows: Figure 1 , Figure 2 and Figure 3 As shown.
[0038] Overall, the thermal shock fatigue testing apparatus includes a base frame 1, a moving switching mechanism mounted on the base frame 1, and a first temperature control device 5 and a second temperature control device 6 spaced below the moving switching mechanism. The tops of both the first temperature control device 5 and the second temperature control device 6 are open, and the test specimen 4 is suspended on the moving switching mechanism. Furthermore, the moving switching mechanism can drive the test specimen 4 to move back and forth above the first temperature control device 5 and the second temperature control device 6, and can also drive the test specimen 4 to move up and down to enter and exit the first temperature control device 5 or the second temperature control device 6.
[0039] It should be noted that, based on the above-mentioned overall design concept, the technical solution of this utility model can adopt a variety of different specific implementation structures, forms, or configuration sequences. For example, the above-mentioned moving switching mechanism can adopt various specific driving forms such as cylinder drive and motor drive; the specific arrangement sequence and device method of the base frame 1, moving switching mechanism, first temperature control device 5, and second temperature control device 6 can also be flexibly adjusted. For the parts required for the implementation of the overall solution but not covered in the above-mentioned overall setup, reasonable and flexible design can be made by referring to mature setting methods in the field and the actual situation during implementation. The specific implementation schemes described below in this embodiment are only one of the many solutions that can be formed by the above-mentioned combinations and variations. In actual implementation, those skilled in the art can make flexible adjustments and improvements based on the actual situation. Obviously, the many solutions that can be formed by the above-mentioned combinations and variations, as well as the specific implementation schemes of this embodiment, are all within the protection scope of this utility model.
[0040] Specifically, in this embodiment, both the first temperature control device 5 and the second temperature control device 6 are in the form of a water bath. The first temperature control device 5 and the second temperature control device 6 are respectively filled with liquids controlled at different set temperatures, allowing the test sample 4 to be completely immersed in the liquid. Since both temperature control devices are in the form of a water bath, the heating or cooling device configured in the water bath can control the liquid in the water bath at the required temperature. Immersing the test sample 4 in liquids of two different temperatures achieves switching between different temperature environments, which is more conducive to rapid heat transfer between the liquid and the test sample 4. This allows the test sample 4 to approach the temperature of the liquid more quickly, resulting in better thermal shock fatigue testing of the test sample 4.
[0041] The temperature control of the liquids in the two water baths can be reasonably set according to the process requirements of the thermal shock fatigue test. For example, when the first temperature control device 5 is a low-temperature temperature control device, liquid nitrogen can be used to control the environment inside the first temperature control device 5 at around -150°C. The second temperature control device 6 is a high-temperature temperature control device at this time, and the liquid inside it can be high-temperature hot oil, and its ambient temperature can be controlled at around 300°C. In this way, the temperature control range of the thermal shock fatigue test device can reach -150°C to 300°C, which has a significant advantage of a larger temperature change range compared to the existing thermal shock fatigue test device with a temperature control range of -60°C to 100°C.
[0042] Moreover, the use of a moving switching mechanism can enable the test sample 4 to move and switch rapidly between the first temperature control device 5 and the second temperature control device 6, which can greatly shorten each temperature switching cycle and significantly improve the efficiency of the test.
[0043] There are, of course, various configuration options available for the specific configuration of the moving switching mechanism. In this embodiment, the moving switching mechanism includes a hoisting assembly 22 capable of horizontally reciprocating above the first temperature control device 5 and the second temperature control device 6. The hoisting assembly 22 includes a rotatable winding wheel 220 and a suspension line 23 wound on the winding wheel 220. The test sample 4 is attached to the end of the suspension line 23. By setting up the hoisting assembly 22, the test sample 4 is hoisted onto the hoisting assembly 22. The winding wheel 220 in the hoisting assembly 22 winds up the suspension line 23, enabling the lifting and lowering of the test sample 4. Furthermore, by driving the hoisting assembly 22 to move horizontally as a whole, the position can be switched between the first temperature control device 5 and the second temperature control device 6.
[0044] There are, of course, various structural schemes for the specific driving method of the moving switching mechanism. For example, two sets of driving devices, one horizontal and one rotary, can be used to drive the horizontal movement of the hoisting assembly 22 and the forward and reverse rotation of the winding wheel 220, respectively. This facilitates the function of switching the test sample 4 between the first temperature control device 5 and the second temperature control device 6, and features a simple transmission structure and easy manufacturing. Specifically, the horizontal driving device can be a linear cylinder or a linear motor, and the rotary driving device can be a rotary motor. In this way, the hoisting assembly 22 moves horizontally reciprocally under the drive of the linear cylinder or linear motor, and the winding wheel 220 rotates under the drive of the rotary motor, thereby realizing the lifting and translation of the test sample 4, and thus completing the switching action of the test sample 4 between the first temperature control device 5 and the second temperature control device 6.
[0045] However, in this embodiment, the moving switching mechanism includes the aforementioned hoisting assembly 22, a drive motor 20 fixed on the base frame 1, a screw 21 rotating under the drive of the drive motor 20, and a guide rail 3 arranged parallel above the screw 21. The hoisting assembly 22 slides along the guide rail 3; the guide rail 3 has a first test position 31 and a second test position 32 respectively located directly above the first temperature control device 5 and the second temperature control device 6. The hoisting assembly 22 is screwed and driven to the screw 21, and as the screw 21 rotates, the hoisting assembly 22 can reciprocate between the first test position 31 and the second test position 32.
[0046] In order to use the screw 21 to realize the translation of the lifting assembly 22 and the rotation drive of the winding wheel 220, a clamping mechanism 222 is provided between the lifting assembly 22 and the screw 21 in this embodiment. Moreover, a clearance structure is provided at the first test position 31 and the second test position 32. When the lifting assembly 22 reaches the first test position 31 or the second test position 32, the clamping mechanism 222 can be controlled to clamp the lifting assembly 22 onto the screw 21, and the clearance structure can be controlled to disengage the lifting assembly 22 from the guide rail 3, so that the winding wheel 220 rotates synchronously with the screw 21 at the first test position 31 or the second test position 32.
[0047] By setting guide rail 3, the drive motor 20 drives the screw 21 to rotate, and the screw transmission structure enables the horizontal movement of the lifting assembly 22. Simultaneously, through the setting of the avoidance structure and the clamping mechanism 222, when the lifting assembly 22 moves to the first test position 31 above the first temperature control device 5 or the second test position 32 above the second temperature control device 6, the avoidance structure and the clamping mechanism 222 control the movement of the lifting assembly 22 to the screw 21, causing the winding wheel 220 to rotate with the screw 21. At this time, controlling the different directions of the drive motor 20 enables the lifting and lowering control of the test sample 4, while the lifting assembly 22 remains entirely above the first temperature control device 5 or the second temperature control device 6. In this way, a single drive unit using the drive motor 20 can achieve both horizontal and vertical movement of the test sample 4, reducing the number of drive units required. Furthermore, the screw transmission translation method between the screw 21 and the lifting assembly 22 features smooth and reliable operation.
[0048] For the design of the avoidance structure, there are naturally many different structural options available. In this embodiment, such as... Figure 2 and Figure 3 As shown, the avoidance structure includes an avoidance groove 30 formed on the guide rail 3 and an avoidance block 300 slidably disposed in the avoidance groove 30; the hoisting assembly 22 has a guide disc 221 fixedly connected to one side of the winding wheel 220, and a sliding groove is provided on the circumferential surface of the guide disc 221 that slides in cooperation with the guide rail 3; when the hoisting assembly 22 reaches the first test position 31 or the second test position 32, the guide disc 221 slides into the avoidance groove 30, and the avoidance block 300 can be manipulated to move upward and disengage from the sliding groove, or move downward and enter the sliding groove.
[0049] By setting a clearance groove 30 on the guide rail 3, when the entire hoisting assembly 22 is stopped at the clearance groove 30, the clearance block 300 moves upward, the guide plate 221 disengages from the guide rail 3, and the clamping mechanism 222 clamps the screw 21. The guide plate 221 can rotate synchronously with the screw 21 through the clearance groove 30, realizing the lifting and lowering drive function of the test sample 4. After the test sample 4 completes the heating and lowering process in the corresponding temperature control device, the test sample 4 is lifted to the top. At this time, the clearance block 300 is controlled to move downward into the sliding groove on the guide plate 221. The clearance block 300 forms part of the guide rail 3 at the bottom notch of the clearance groove 30. The clamping mechanism 222 disengages from the screw 21 at the same time. Under the rotation drive of the screw 21, the hoisting assembly 22 can continue to move horizontally. Since the lifting height of the test sample 4 is fixed, the lifting process of the test sample 4 can be completed by rotating the drive motor 20 a fixed number of times. Therefore, when the test sample 4 returns to the top again, the slide groove on the guide plate 221 will still be directly opposite the clearance block 300, so the downward-moving clearance block 300 will still smoothly enter the slide groove. In order to further ensure the smoothness of the clearance block 300 entering the slide groove, the bottom of the clearance block 300 can be set to be smaller, or a sloping guide structure can be set on both sides of the bottom of the clearance block 300 to facilitate the downward-moving clearance block 300 to smoothly enter the slide groove.
[0050] Based on the above configuration, the clearance block 300 in this embodiment is further provided with a detection device 301 for detecting whether the guide disk 221 has entered the clearance groove 30. This detection device 301 is preferably a limit switch or a proximity switch. By providing the detection device 301 on the clearance block 300, when the guide disk 221 reaches the first test position 31 or the second test position 32, a detection signal can be sent to the control unit to control the rotation of the drive motor 20, the upward movement of the clearance block 300, and the clamping action of the clamping mechanism 222, thereby facilitating the automatic control of the thermal shock fatigue testing device.
[0051] The clamping mechanism 222 is preferably configured as follows. In this embodiment, the clamping mechanism 222 includes a gripper fixed to the guide disc 221 on the side opposite to the winding wheel 220. The gripper can be manipulated to clamp the screw 21; a soft pad is provided at the contact point between the gripper and the screw 21. By providing a soft pad on the gripper, damage to the teeth of the screw 21 can be avoided during the clamping action. The clamping drive of the gripper and the up-and-down movement drive of the avoidance block 300 can be designed with reference to existing similar structures; for example, the drive method using an electromagnetic coil and iron core found in automatic door locks can be adopted, which also facilitates control of the movement of the gripper and the avoidance block 300.
[0052] Furthermore, the thermal shock fatigue testing apparatus of this embodiment also includes a control unit. The drive motor 20, the detection device 301, and the drive components of the avoidance block 300 and the clamping mechanism 222 are all connected to the control unit. The control unit receives the arrival detection signal from the detection device 301 and sets appropriate switching time and other parameters to realize actions such as forward and reverse rotation of the drive motor 20, up and down movement of the avoidance block 300, and clamping and releasing of the clamping mechanism 222. This forms a complete control architecture, which is beneficial for flexibly and reliably realizing the shifting and switching control of the test sample 4 between the first temperature control device 5 and the second temperature control device 6.
[0053] It should be noted that, as a highly efficient energy conversion device, the proton exchange membrane fuel cell (PEMFC) can directly convert the chemical energy of hydrogen and oxygen into electrical energy through electrochemical reactions, producing only water. The proton exchange membrane, as the core component of the PEMFC, plays a crucial role and is one of the core basic materials of the PEMFC. Its performance determines the performance and lifespan of the fuel cell, requiring high proton conductivity, good thermal and chemical stability, high mechanical strength, and durability. The main functions of the bipolar plates are to separate the reactant gases, guide them into the fuel cell through a flow field, collect and conduct current, support the membrane electrode assembly, and perform heat dissipation and drainage functions for the entire fuel cell. Common bipolar plates are mainly metal bipolar plates, graphite bipolar plates, and composite bipolar plates. All of the above materials require good resistance to thermal shock. Therefore, the thermal shock fatigue testing device of this invention can be widely used in the field of proton exchange membrane fuel cells to conduct a large number of thermal shock tests. These materials are used as test samples 4. Using the thermal shock fatigue testing device of this invention, thermal shock tests can be carried out conveniently and quickly.
[0054] This invention relates to a fully automated thermal shock fatigue testing device for conducting thermal shock tests on test specimens 4. It is particularly effective for testing the thermal shock resistance of frame films, ceramic bipolar plates, and graphite bipolar plates. Thermal shock testing has two key requirements: 1. the shorter the temperature alternation time, the better; 2. the higher the alternation frequency, the better. Simple thermal shock chambers struggle to complete temperature changes exceeding 100°C within seconds, and for graphite bipolar plates, more than 10,000 cycles are required, which is difficult to achieve manually. This invention's thermal shock fatigue testing device effectively solves these problems.
[0055] During use, the entire movement and switching process of the test sample 4 is as follows: Figure 4As shown, the specific steps include: a. Initial position → b. Descending → c. Low-temperature immersion → d. Ascending → e. Reaching the top → f. Moving → g. Moving to the correct position → h. Descending → i. High-temperature immersion → j. Ascending → k. Reaching the top → l. Moving back.
[0056] During steps b to e, the clearance block 300 at the first test position 31 moves upward, and the clamping mechanism 222 clamps the screw 21. During steps h to k, the clearance block 300 at the second test position 32 moves upward, and the clamping mechanism 222 clamps the screw 21. During other steps, the clearance block 300 moves downward, and the clamping mechanism 222 releases the screw 21. Simultaneously, by combining this with appropriate forward and reverse control of the drive motor 20, the entire movement and switching process of the test sample 4 can be completed.
[0057] The entire process control logic described above is clear and simple. The control unit can be implemented using ordinary relays and time relays. Of course, a PLC can also be used as the control unit. The simple logic and switching cycle parameters described above can be set into the PLC program. Those skilled in the art can easily complete the setting of the control unit according to the above logic requirements.
[0058] Overall, compared with conventional thermal shock test chambers, the thermal shock fatigue testing device of this invention not only has lower equipment costs and a wider temperature control range, but also faster temperature change speed, enabling more stringent tests. Because this thermal shock fatigue testing device can be automatically controlled and switched, it can complete the four major workloads of thermal shock fatigue testing on the test specimens without human intervention.
[0059] In summary, the thermal shock fatigue testing apparatus of this embodiment, by setting two temperature control devices, can control the internal temperature of the two temperature control devices to two different temperature conditions, high and low. The moving switching mechanism drives the test sample 4 to move horizontally back and forth above the first temperature control device 5 and the second temperature control device 6. Then, by moving up and down, the test sample 4 is moved into the first temperature control device 5 or the second temperature control device 6, completing the movement and switching of the test sample 4 between the first temperature control device 5 and the second temperature control device 6. This allows the test sample 4 to smoothly switch frequently between the two different temperature environments, so as to realize the thermal shock fatigue test of the test sample 4. Thus, a driving mechanism scheme for smoothly moving the test sample 4 between two temperature control devices is provided.
[0060] The above description is merely a preferred embodiment of this utility model. Detailed explanations of configurations, examples of specific structural arrangements, and descriptions of assembly and connection methods are provided to ensure sufficient disclosure so that those skilled in the art can better implement this utility model, and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.
Claims
1. A thermal shock fatigue testing device, characterized in that: It includes a base frame (1), a movable switching mechanism disposed on the base frame (1), and a first temperature control device (5) and a second temperature control device (6) disposed at intervals below the movable switching mechanism; The tops of the first temperature control device (5) and the second temperature control device (6) are both open, and the test sample (4) is suspended on the moving switching mechanism; The moving switching mechanism can drive the test sample (4) to move back and forth above the first temperature control device (5) and the second temperature control device (6), and can drive the test sample (4) to move up and down to enter and exit the first temperature control device (5) or the second temperature control device (6).
2. The thermal shock fatigue testing apparatus according to claim 1, characterized in that: Both the first temperature control device (5) and the second temperature control device (6) are water baths. The first temperature control device (5) and the second temperature control device (6) are respectively filled with liquids that can be controlled at different set temperatures. The test sample (4) that enters the first temperature control device (5) or the second temperature control device (6) can be completely immersed in the liquid.
3. The thermal shock fatigue testing apparatus according to claim 1 or 2, characterized in that: The moving switching mechanism includes a hoisting assembly (22) capable of horizontally reciprocating above the first temperature control device (5) and the second temperature control device (6); The hoisting assembly (22) includes a rotatable winding reel (220) and a hoisting line (23) wound on the winding reel (220); the test specimen (4) is attached to the end of the hoisting line (23).
4. The thermal shock fatigue testing apparatus according to claim 3, characterized in that: The hoisting assembly (22) moves horizontally reciprocally under the drive of a linear cylinder or a linear motor, and the winding reel (220) rotates under the drive of a rotary motor.
5. The thermal shock fatigue testing apparatus according to claim 3, characterized in that: The moving switching mechanism also includes a drive motor (20) fixed on the base frame (1), a screw (21) rotating under the drive of the drive motor (20), and a guide rail (3) arranged parallel above the screw (21). The hoisting assembly (22) slides on the guide rail (3). The guide rail (3) is provided with a first test position (31) and a second test position (32) located directly above the first temperature control device (5) and the second temperature control device (6), respectively. The hoisting assembly (22) is screwed and driven to the screw (21). As the screw (21) rotates, the hoisting assembly (22) can reciprocate between the first test position (31) and the second test position (32).
6. The thermal shock fatigue testing apparatus according to claim 5, characterized in that: A clamping mechanism (222) is provided between the hoisting assembly (22) and the screw (21), and a clearance structure is provided at both the first test position (31) and the second test position (32); When the hoisting assembly (22) reaches the first test position (31) or the second test position (32), the clamping mechanism (222) can be manipulated to clamp the hoisting assembly (22) onto the screw (21), and the avoidance structure can be manipulated to disengage the hoisting assembly (22) from the guide rail (3), so that the winding wheel (220) rotates synchronously with the screw (21) at the first test position (31) or the second test position (32).
7. The thermal shock fatigue testing apparatus according to claim 6, characterized in that: The avoidance structure includes an avoidance groove (30) formed on the guide rail (3) and an avoidance block (300) slidably disposed in the avoidance groove (30); The hoisting assembly (22) has a guide plate (221) fixed to one side of the winding reel (220), and the guide plate (221) has a groove on its circumferential surface that slides in cooperation with the guide rail (3). When the hoisting assembly (22) reaches the first test position (31) or the second test position (32), the guide plate (221) slides into the clearance groove (30), and the clearance block (300) can be manipulated to move upward to disengage from the groove, or move downward into the groove.
8. The thermal shock fatigue testing apparatus according to claim 7, characterized in that: The clearance block (300) is provided with a detection device (301) for detecting whether the guide plate (221) enters the clearance groove (30).
9. The thermal shock fatigue testing apparatus according to claim 8, characterized in that: It also includes a control unit, and the drive components of the drive motor (20), the detection device (301), the avoidance block (300) and the clamping mechanism (222) are all connected to the control unit.
10. The thermal shock fatigue testing apparatus according to claim 6, characterized in that: The clamping mechanism (222) includes a gripper fixed to the guide plate (221) on the side opposite to the winding wheel (220), the gripper being operable to clamp the screw (21); the contact portion between the gripper and the screw (21) is provided with a soft pad.