A cold and hot cycle alternating testing machine

Abstract

The utility model relates to a test machine field, and specifically is a cold and hot cycle alternate test machine, including base, still including test machine cabinet, cabinet door, thermometer, baffle, circulating fan alternate mechanism and loading mechanism, test machine cabinet installs the surface at base, and the door body opening and sample movement action cooperate, need not manual intervention, and the cabin body switching efficiency is greatly promoted, and the whole passageway opens, and sample movement flow realizes full automation linkage, completely replaces traditional manual door opening, manual sample handling and manual door closing operation mode, and the efficiency improvement effect is remarkable, and need not manual frequent opening test machine cabinet door, avoid the cabin cold air, hot air in the process of manual operation to leak, reduce cabin temperature fluctuation, the action of plugging motor drive door body opening, moving motor drive sample movement can be continuously triggered, sample can start moving immediately after door body completely opens, and there is no action gap between the two, can greatly shorten the whole test cycle, reduce test time cost.

Description

Technical Field

[0001] This utility model relates to the field of testing machine technology, specifically to a cold and hot cycle alternating testing machine. Background Technology

[0002] In industrial production, materials research and development, and electronic component testing, thermal cycling is a crucial method for evaluating the reliability and stability of products or materials under extreme temperature environments. As a core testing device, the performance of thermal cycling testing machines directly affects the accuracy of test data, testing efficiency, and overall operating costs. However, existing thermal cycling testing machines still face many technical challenges that urgently need to be addressed in practical applications. The existing hot and cold cycling test chambers have the following shortcomings: 1. The chamber switching of traditional hot and cold cycling test chambers relies heavily on manual operation. Test personnel need to manually open the cabinet door, move the sample, and then close the cabinet door. The entire process has a low degree of automation, which not only leads to low chamber switching efficiency and a large amount of manual time cost, but also causes cold or hot air to leak out of the chamber due to frequent manual opening and closing of the cabinet door. This can cause drastic fluctuations in the chamber temperature, affect the stability of the test environment, and thus lead to deviations in the test data. 2. Most testing machines use a single clamping or locking method for fixing, which has limited fixing strength and stability. When the sample moves between different chambers with the moving vehicle, it is prone to displacement due to inertial forces or thermal expansion and contraction under extreme temperature conditions. Utility Model Content

[0003] The purpose of this invention is to provide a cold and hot cycle alternation test machine.

[0004] To achieve this objective, the present invention adopts the following technical solution: A thermal cycling test chamber is provided, including a base, a test cabinet, cabinet doors, thermometers, partitions, a circulating fan alternation mechanism, and a loading mechanism. The test cabinet is mounted on the surface of the base, and the partitions are fixed in the middle of the inner cavity of the test cabinet, dividing the test cabinet into a cooling test chamber and a heating test chamber. Two sets of cabinet doors are respectively hinged to two sets of doors on the surface of the test cabinet. The thermometers are fixed on the surface of the cabinet doors for monitoring the internal temperature of the test chambers. Two sets of circulating fans are respectively fixed inside the cooling test chamber and the heating test chamber of the test cabinet. The alternation mechanism is installed inside the test cabinet and includes... The system includes a limiting slide rail, heat-insulating sealing doors, moving tracks, and a moving trolley. The limiting slide rail is fixed to one side of the partition plate. Two sets of heat-insulating sealing doors are symmetrically arranged on one side of the limiting slide rail, and sealing gaskets are fixed on the opposite sides of the two sets of heat-insulating sealing doors. Two sets of moving tracks are fixed to the bottom of the inner cavity of the test cabinet. The moving trolley is slidably connected between the two sets of moving tracks. The loading mechanism is installed on the surface of the moving trolley. The loading mechanism includes a loading seat, a clamping plate, a lower pressure plate, and a spring. The loading seat is fixed to the surface of the moving trolley. The lower pressure plate is hinged to both sides of the loading seat. The clamping plate is fixed to the surface of the lower pressure plate. The spring is fixed between the lower pressure plate and the loading seat.

[0005] Preferably, the alternating mechanism further includes a limiting slide, a rack, a gear, and a worm gear pair. The limiting slide is fixed to the surface of the heat-insulating sealing door and is slidably connected to the surface of the limiting slide rail. Two sets of racks are respectively fixed to the surfaces of two sets of limiting slides. The gear is meshed between the two sets of racks. The gear is rotatably connected to the surface of the partition plate through a rotating shaft. The two sets of racks are arranged symmetrically about the gear. The worm wheel end of the worm gear pair is fixedly connected to the rotating shaft surface of the gear.

[0006] Preferably, a sealing motor is fixed on the top of the test cabinet, and the output shaft of the sealing motor is fixedly connected to the worm end of the worm gear pair. Starting the sealing motor can drive the gear to rotate through the worm gear pair, thereby driving the rack to drive the limit slide and the heat insulation sealing door to slide along the surface of the limit slide rail.

[0007] Preferably, the alternation mechanism further includes a moving motor and a threaded rod. The moving motor is fixed at the bottom of the inner cavity of the test cabinet, and the threaded rod is rotatably connected to the inside of the test cabinet through a bearing. The output shaft of the moving motor is fixedly connected to one end of the threaded rod, and the threaded rod is threadedly connected to the moving vehicle. Starting the moving motor can drive the threaded rod to rotate, driving the moving vehicle to switch between the cooling test chamber and the heating test chamber along the moving track.

[0008] Preferably, a guide rod is fixed inside one side of the lower pressure plate, and a guide hole adapted to the guide rod is opened inside the loading seat to improve the stability of the lower pressure plate during the flipping and pressing process. In the initial state, the spring is in the contracted state, and one end of the lower pressure plate is tilted upward.

[0009] Preferably, the loading mechanism further includes a locking seat, a pull rod, a second spring, and a locking block. The locking seat is fixed to the surface of the loading seat, the locking block is slidably connected to a storage groove opened inside the loading seat, the pull rod is fixed to the surface of the locking block, and the pull rod extends through the locking seat to the outside. The second spring is sleeved on the surface of the pull rod, and the two ends of the second spring are fixedly connected to the blocking rings on the surfaces of the locking seat and the pull rod, respectively.

[0010] Preferably, an anti-slip rubber pad is fixed to the inner surface of the clamping plate. The surface of the anti-slip rubber pad is provided with anti-slip texture to increase the friction between the clamping plate and the test sample and prevent the sample from sliding and shifting during the test.

[0011] Preferably, a transparent observation window is fixed on the surface of the cabinet door to facilitate observation of the test status of the samples inside the test chamber. A sealing strip is fixed on the edge of the cabinet door, and the sealing strip is in contact with the edge of the test chamber opening. The pulley on the surface of the limiting slide is in contact with the surface of the limiting slide rail to reduce sliding friction loss between the limiting slide and the limiting slide rail.

[0012] The beneficial effects of this utility model are: 1. This utility model discloses a cold and hot cycle alternating test machine. The door opening and sample movement are coordinated, eliminating the need for manual intervention and significantly improving the efficiency of chamber switching. The entire process of opening the channel and moving the sample is fully automated, completely replacing the traditional operation mode of manually opening the door, manually moving the sample, and manually closing the door. The efficiency improvement is significant. There is no need for frequent manual opening of the test machine cabinet door, which avoids the leakage of cold and hot air inside the chamber during manual operation and reduces the temperature fluctuation of the chamber. The actions of the sealing motor driving the door opening and the moving motor driving the sample movement can be triggered continuously. After the door is fully opened, the sample can start moving immediately without any gap between the two actions, which can significantly shorten the overall test cycle and reduce the test time cost.

[0013] 2. This utility model discloses a thermal cycling test chamber with synchronized door movement and matching sealing gaskets. The opening and closing of the passage is seamless, reducing temperature loss inside the chamber. Two sets of heat-insulated sealing doors move synchronously in opposite directions via gears and racks, ensuring that when the doors open, the two sets of doors separate evenly along the limit slide rails, and the sealing gaskets on opposite sides simultaneously detach and adhere. When the doors close, the two sets of doors approach synchronously, and the sealing gaskets precisely align and adhere, avoiding misalignment of the sealing gaskets and air leakage caused by one side of the door arriving first. This ensures that the chamber passage is completely open, with no obstruction after the doors separate, preventing residual door parts from obstructing the passage of moving carts and samples. It also ensures that the passage is completely sealed. After closing, the door sealing gaskets are tightly fitted with the partition plates and the inner wall of the test chamber without obvious gaps, effectively blocking the airflow between the cooling test chamber and the heating test chamber, avoiding temperature fluctuations caused by the mutual penetration of cold and hot air, reducing energy consumption and time for temperature rise and fall, thus reducing equipment operating costs and ensuring the stability of the test environment inside the chamber.

[0014] 3. This utility model discloses a thermal cycling test machine with a double-fixed structure, which ensures the ultimate fixation reliability and completely eliminates test displacement. Compared with a single clamping or locking method, the double-fixation mechanism of elastic clamping and mechanical locking greatly improves the fixation strength and stability. Spring 1 is always in an elastic deformation state, and through continuous and uniform elastic force acting on the lower pressure plate, it drives the clamping plate to always be in contact with the sample surface, avoiding the clamping force from decreasing over time. It effectively resists the inertial force of the sample when moving in the chamber and the thermal expansion and contraction stress during temperature changes, and initially blocks the risk of slippage. Spring 2 drives the locking block to precisely cooperate with the sample's preset locking groove to form a rigid mechanical limit, restricting the sample's vertical, horizontal, and forward and backward movement in terms of displacement freedom. Even in the face of violent airflow circulation in the chamber or slight vibration of the equipment, it can prevent sample displacement. The double-fixing superposition can minimize the sample displacement rate, completely eliminate the test data deviation caused by sample displacement, and reduce the time and cost waste caused by repeated tests.

[0015] 4. This utility model provides a thermal cycling test machine with an action logic adapted to operating habits. Loading and unloading are convenient and efficient, reducing labor costs. The entire sample fixing process follows a simple logic from natural placement to automatic triggering clamping and then to manual assisted locking. No complicated tools or professional operating skills are required, which greatly reduces the threshold for personnel operation. When loading before the test, the spring is already in a contracted state in the initial state, and one end of the lower pressure plate naturally tilts upward, fully exposing the receiving groove of the loading seat. The tester can directly put the sample in without manually prying open the clamp. During the sample placement process, it will naturally press the tilted end of the lower pressure plate, triggering the lower pressure plate to flip and the clamp to automatically clamp. No additional operation is required. Afterward, only the pull rod needs to be pulled to calibrate the sample position and then released to complete the locking. This reduces the labor intensity of the tester and reduces human error caused by cumbersome operation, significantly improving the overall test efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below.

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the structure of the test cabinet of this utility model; Figure 3 This is a schematic diagram of the structure of the partition plate and the sealing door of this utility model; Figure 4 This is a schematic diagram of the structure of the mobile vehicle and loading seat of this utility model; Figure 5 This is a schematic diagram of the structure of the loading seat of this utility model; Figure 6 This is a schematic diagram of the structure of the loading seat and clamping plate of this utility model; In the diagram: 1. Base; 2. Test cabinet; 3. Cabinet door; 4. Thermometer; 5. Divider plate; 6. Circulating fan; 7. Alternating mechanism; 8. Limiting slide rail; 9. Limiting slide seat; 10. Insulated sealing door; 11. Rack; 12. Gear; 13. Worm gear pair; 14. Sealing motor; 15. Moving track; 16. Moving cart; 17. Moving motor; 18. Threaded rod; 19. Loading mechanism; 20. Loading seat; 21. Clamping plate; 22. Lower pressure plate; 23. Spring 1; 24. Guide rod; 25. Locking seat; 26. Pull rod; 27. Spring 2; 28. Locking block. Detailed Implementation

[0018] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product.

[0020] Reference Figures 1 to 6The illustrated alternating hot and cold cycle test chamber includes a base 1, a test cabinet 2, cabinet doors 3, thermometers 4, partition plates 5, circulating fans 6, an alternating mechanism 7, and a loading mechanism 19. The test cabinet 2 is mounted on the surface of the base 1. The partition plate 5 is fixed in the middle of the inner cavity of the test cabinet 2, dividing the test cabinet 2 into a cooling test chamber and a heating test chamber. Two sets of cabinet doors 3 are respectively hinged to two sets of doors on the surface of the test cabinet 2. The thermometers 4 are fixed to the surface of the cabinet doors 3 for monitoring the internal temperature of the test chamber. Two sets of circulating fans 6 are respectively fixed to the cooling chamber of the test cabinet 2. Inside the test chamber and the heating test chamber, the alternation mechanism 7 is installed inside the test cabinet 2. The alternation mechanism 7 includes a limiting slide rail 8, a heat-insulating sealing door 10, a moving track 15, and a moving cart 16. The limiting slide rail 8 is fixed to one side of the surface of the partition plate 5. Two sets of heat-insulating sealing doors 10 are symmetrically arranged on one side of the limiting slide rail 8, and sealing gaskets are fixed on the opposite sides of the two sets of heat-insulating sealing doors 10. The two sets of moving tracks 15 are fixed to the bottom of the inner cavity of the test cabinet 2. The moving cart 16 is slidably connected between the two sets of moving tracks 15. The loading mechanism 19 is installed on the surface of the moving cart 16. The loading mechanism 19 includes a loading... The loading seat 20, clamping plate 21, lower pressure plate 22, and spring 23 are all fixed to the surface of the moving vehicle 16. The lower pressure plate 22 is hinged to both sides of the loading seat 20. The clamping plate 21 is fixed to the surface of the lower pressure plate 22. The spring 23 is fixed between the lower pressure plate 22 and the loading seat 20. During the test, the temperature of each test chamber is maintained. The two sets of circulating fans 6 fixed in the cooling test chamber and the heating test chamber are started. The circulating fans 6 accelerate the flow of cold and hot air in the chamber, so that the temperature in the chamber is evenly distributed, avoiding local temperature differences from affecting the test accuracy and ensuring that all parts of the sample are at the same temperature. In the test temperature environment, thermometers 4 fixed on the surface of cabinet door 3 continuously monitor the internal temperature of the test chamber. There is a set of thermometers 4 for each of the cooling and heating chambers. Test personnel can obtain the chamber temperature data in real time through thermometers 4 to determine whether the preset test temperature has been reached. If the temperature is abnormal, the test parameters can be adjusted in time. The transparent observation window on the surface of cabinet door 3 allows real-time observation of the sample status inside the test chamber without opening cabinet door 3, thus avoiding temperature fluctuations. At the same time, the sealing strip on the edge of cabinet door 3 fits tightly with the edge of the test cabinet 2 hatch, further enhancing the chamber's sealing performance, reducing temperature loss inside the chamber, and maintaining a stable test environment.

[0021] Reference Figures 1 to 3The alternating mechanism 7 also includes a limiting slide 9, a rack 11, a gear 12, and a worm gear pair 13. The limiting slide 9 is fixed to the surface of the heat-insulating sealing door 10 and is slidably connected to the surface of the limiting slide rail 8. Two sets of racks 11 are respectively fixed to the surfaces of the two sets of limiting slides 9. The gear 12 is meshed between the two sets of racks 11. The gear 12 is rotatably connected to the surface of the partition plate 5 through a rotating shaft, and the two sets of racks 11 are arranged symmetrically about the gear 12. The worm wheel end of the worm gear pair 13 is fixedly connected to the rotating shaft surface of the gear 12.

[0022] Reference Figures 1 to 3 A sealing motor 14 is fixed to the top of the test cabinet 2, and the output shaft of the sealing motor 14 is fixedly connected to the worm end of the worm gear pair 13. Starting the sealing motor 14 can drive the gear 12 to rotate through the worm gear pair 13, thereby driving the rack 11 to drive the limit slide 9 and the heat insulation sealing door 10 to slide along the surface of the limit slide rail 8. Starting the sealing motor 14 at the top of the test cabinet 2, the output shaft of the sealing motor 14 drives the worm end of the worm gear pair 13 to rotate, thereby driving the worm end of the worm gear pair 13 to rotate synchronously, realizing power transmission. The gear 12 rotates smoothly by increasing speed and torque. When the gear 12 rotates, the two sets of racks 11 connected to it move in opposite directions, which drives the limiting slides 9 connected to the two sets of racks 11 to move synchronously. The limiting slides 9 slide along the limiting slide rail 8 fixed on one side of the surface of the partition plate 5, which in turn drives the heat insulation sealing door 10 connected to the two sets of limiting slides 9 to separate in opposite directions. The sealing gasket on the opposite side of the heat insulation sealing door 10 then detaches from the adhesive state, opening up the channel between the cooling test chamber and the heating test chamber separated by the partition plate 5, preparing for the movement of the sample.

[0023] Reference Figures 1 to 4 The alternation mechanism 7 also includes a moving motor 17 and a threaded rod 18. The moving motor 17 is fixed to the bottom of the inner cavity of the test cabinet 2. The threaded rod 18 is rotatably connected to the inside of the test cabinet 2 through a bearing. The output shaft of the moving motor 17 is fixedly connected to one end of the threaded rod 18, and the threaded rod 18 is threadedly connected to the moving carriage 16. Starting the moving motor 17 can drive the threaded rod 18 to rotate, driving the moving carriage 16 to switch between the cooling test chamber and the heating test chamber along the moving track 15. Starting the moving motor 17 at the bottom of the inner cavity of the test cabinet 2, the output shaft of the moving motor 17 drives the threaded rod 18 fixed through the bearing to rotate. The threaded rod 18 is threadedly connected to the moving carriage 16, converting the rotational power into the linear motion of the moving carriage 16. The moving carriage 16 slides smoothly along the two sets of moving tracks 15 fixed to the bottom of the inner cavity of the test cabinet 2. If the sample is initially in the cooling test chamber, the moving carriage 16 drives the loading mechanism 19 and the sample to move to the heating test chamber. If the sample is initially in the heating test chamber, it moves in the opposite direction to the cooling test chamber, accurately realizing the switching of the sample chamber.

[0024] Reference Figures 5 to 6A guide rod 24 is fixed inside one side of the lower pressure plate 22. The loading seat 20 has a guide hole that matches the guide rod 24 to improve the stability of the lower pressure plate 22 during the flipping and pressing process. In the initial state, the spring 1 23 is in the contracted state and one end of the lower pressure plate 22 is tilted upward. Before the test, the sample is loaded and fixed. In the initial state, the spring 1 23 in the loading mechanism 19 is in the contracted state and one end of the lower pressure plate 22 is tilted upward. Under the elastic force of the spring 27, the locking block 28 extends out of the storage groove of the loading seat 20. At this time, the test sample can be placed into the preset receiving groove in the loading seat 20. As the test sample is loaded, the tilted end of the lower pressure plate 22 will be gradually pressed. The lower pressure plate 22 flips around the hinge connected to the loading seat 20. During the process, the guide hole inside the loading seat 20 and the guide rod 24 on one side of the lower pressure plate 22 cooperate to slide, ensuring that the lower pressure plate 22 flips stably and avoids displacement.

[0025] Reference Figure 6 The loading mechanism 19 also includes a locking seat 25, a pull rod 26, a second spring 27, and a locking block 28. The locking seat 25 is fixed to the surface of the loading seat 20. The locking block 28 is slidably connected to a storage groove opened inside the loading seat 20. The pull rod 26 is fixed to the surface of the locking block 28 and extends through the locking seat 25 to the outside. The second spring 27 is sleeved on the surface of the pull rod 26, and both ends of the second spring 27 are fixedly connected to the blocking rings on the surfaces of the locking seat 25 and the pull rod 26, respectively. When the lower pressure plate 22 flips, the clamping plate 21 fixed on its surface moves towards the sample synchronously until the anti-slip rubber on the inner side of the clamping plate 21 is engaged. The rubber pad adheres tightly to the sample surface, and the anti-slip texture increases friction to initially prevent the sample from sliding. At this time, spring 23 further contracts, and the elastic force acts in the opposite direction on the lower pressure plate 22, so that the clamping plate 21 maintains the clamping force on the sample. The sample surface has a locking groove. Pulling the pull rod 26 causes the spring 27 to compress, and the locking block 28 is completely retracted into the receiving groove. After the sample position is calibrated, the pull rod 26 is released, and the spring 27 resets and pushes the locking block 28 into the locking groove of the sample, completing the double fixation of sample clamping and locking, avoiding sample displacement during the test. After the sample is fixed, the test can be started.

[0026] Reference Figures 5 to 6 An anti-slip rubber pad is fixed on the inner surface of the clamping plate 21. The surface of the anti-slip rubber pad is provided with anti-slip texture to increase the friction between the clamping plate 21 and the test sample and prevent the sample from sliding and shifting during the test.

[0027] Reference Figures 1 to 3 A transparent observation window is fixed on the surface of the cabinet door 3 to facilitate observation of the test status of the samples inside the test chamber. A sealing strip is fixed on the edge of the cabinet door 3, and the sealing strip is in contact with the edge of the hatch of the test cabinet 2. The pulley on the surface of the limiting slide 9 is in contact with the surface of the limiting slide rail 8 to reduce the sliding friction loss between the limiting slide 9 and the limiting slide rail 8.

[0028] After the sample is moved to the target chamber, the sealing motor 14 is started in reverse. The worm gear pair 13 drives the gear 12 to rotate in the opposite direction, and the two sets of racks 11 move in the same direction. The limiting slide 9 drives the heat insulation sealing door 10 to close, and the sealing gasket is re-attached, separating the two test chambers again to avoid mutual interference between the cooling and heating environments and ensure the temperature of each chamber is stable. The linkage process is repeated to achieve alternating cold and heat. When the sample reaches the preset test time in the target chamber, the test process is repeated. First, the heat insulation sealing door 10 is opened, then the sample is moved back to the initial chamber by the moving cart 16, and finally the heat insulation sealing door 10 is closed to complete one cold to hot or hot to cold cycle. During each cycle, the circulating fan 6 continuously maintains the chamber temperature uniformity, and the thermometer 4 continuously monitors the temperature. The test personnel observe the sample status through the transparent observation window until the preset number of cold and hot cycles is completed. After the test, the power components such as the circulating fan 6, the moving motor 17, and the sealing motor 14 are turned off. After the temperature of the two test chambers drops to room temperature, the cabinet door 3 of the corresponding chamber is opened, the pull rod 26 of the loading mechanism 19 is pulled, the locking block 28 is retracted, the sample is released, and then the sample is pulled upward. The spring 23 resets and drives the lower pressure plate 22 and the clamping plate 21 to flip and loosen, releasing the sample clamping. Finally, the sample is taken out, completing the entire test process. After the test, the sealing motor 14 is started in reverse to close the heat insulation sealing door 10. The moving motor 17 drives the moving cart 16 back to the initial position, and all components are reset to prepare for the next test.

Claims

1. A thermal cycling test machine, comprising a base (1), characterized in that: It also includes a test cabinet (2), cabinet doors (3), thermometers (4), partitions (5), circulating fans (6), alternating mechanism (7), and loading mechanism (19). The test cabinet (2) is installed on the surface of the base (1). The partitions (5) are fixed in the middle of the inner cavity of the test cabinet (2), dividing the test cabinet (2) into a refrigeration test chamber and a heating test chamber. Two sets of cabinet doors (3) are respectively hinged to the two sets of doors on the surface of the test cabinet (2). The thermometers (4) are fixed on the surface of the cabinet doors (3) to monitor the temperature inside the test chamber. Two sets of circulating fans (6) are respectively fixed in the refrigeration test chamber and the heating test chamber of the test cabinet (2). The alternating mechanism (7) is installed inside the test cabinet (2). The alternating mechanism (7) includes a limiting slide rail (8), a heat-insulating sealing door (10), a moving track (15), and a moving cart (19). 16), the limiting slide rail (8) is fixed on one side of the surface of the partition plate (5), two sets of heat insulation sealing doors (10) are symmetrically arranged on one side of the limiting slide rail (8), and the opposite side of the two sets of heat insulation sealing doors (10) is fixed with a sealing gasket, two sets of moving rails (15) are fixed at the bottom of the inner cavity of the test cabinet (2), the moving cart (16) is slidably connected between the two sets of moving rails (15), the loading mechanism (19) is installed on the surface of the moving cart (16), the loading mechanism (19) includes a loading seat (20), a clamping plate (21), a lower pressure plate (22) and a spring (23), the loading seat (20) is fixed on the surface of the moving cart (16), the lower pressure plate (22) is hinged to both sides of the loading seat (20) by a hinge, the clamping plate (21) is fixed on the surface of the lower pressure plate (22), and the spring (23) is fixed between the lower pressure plate (22) and the loading seat (20).

2. The alternating hot and cold cycle testing machine according to claim 1, characterized in that: The alternating mechanism (7) also includes a limiting slide (9), a rack (11), a gear (12), and a worm gear pair (13). The limiting slide (9) is fixed on the surface of the heat-insulating sealing door (10) and is slidably connected to the surface of the limiting slide rail (8). Two sets of racks (11) are fixed on the surfaces of the two sets of limiting slides (9), and the gear (12) is meshed between the two sets of racks (11). The gear (12) is rotatably connected to the surface of the partition plate (5) through a rotating shaft, and the two sets of racks (11) are arranged in a centrally symmetrical manner about the gear (12). The worm wheel end of the worm gear pair (13) is fixedly connected to the rotating shaft surface of the gear (12).

3. The alternating hot and cold cycle testing machine according to claim 2, characterized in that: The top of the test cabinet (2) is fixed with a sealing motor (14), and the output shaft of the sealing motor (14) is fixedly connected to the worm end of the worm gear pair (13). When the sealing motor (14) is started, the gear (12) can be driven to rotate through the worm gear pair (13), which in turn drives the rack (11) to drive the limit slide (9) and the heat insulation sealing door (10) to slide along the surface of the limit slide rail (8).

4. The alternating hot and cold cycle testing machine according to claim 1, characterized in that: The alternation mechanism (7) also includes a moving motor (17) and a threaded rod (18). The moving motor (17) is fixed at the bottom of the inner cavity of the test cabinet (2). The threaded rod (18) is rotatably connected to the inside of the test cabinet (2) through a bearing. The output shaft of the moving motor (17) is fixedly connected to one end of the threaded rod (18), and the threaded rod (18) is threadedly connected to the moving vehicle (16). Starting the moving motor (17) can drive the threaded rod (18) to rotate, driving the moving vehicle (16) to switch between the cooling test chamber and the heating test chamber along the moving track (15).

5. The alternating hot and cold cycle testing machine according to claim 1, characterized in that: A guide rod (24) is fixed inside one side of the lower pressure plate (22). The loading seat (20) has a guide hole that matches the guide rod (24) to improve the stability of the lower pressure plate (22) during the flipping and pressing process. In the initial state, the spring (23) is in the contracted state and one end of the lower pressure plate (22) is tilted upward.

6. The alternating hot and cold cycle testing machine according to claim 1, characterized in that: The loading mechanism (19) also includes a locking seat (25), a pull rod (26), a second spring (27), and a locking block (28). The locking seat (25) is fixed on the surface of the loading seat (20). The locking block (28) is slidably connected in the storage slot opened inside the loading seat (20). The pull rod (26) is fixed on the surface of the locking block (28) and extends through the locking seat (25) to the outside. The second spring (27) is sleeved on the surface of the pull rod (26), and the two ends of the second spring (27) are fixedly connected to the blocking rings on the surfaces of the locking seat (25) and the pull rod (26), respectively.

7. The alternating hot and cold cycle testing machine according to claim 1, characterized in that: The inner surface of the clamp (21) is fixed with an anti-slip rubber pad. The surface of the anti-slip rubber pad is provided with anti-slip texture to increase the friction between the clamp (21) and the test sample and prevent the sample from sliding and shifting during the test.

8. The alternating hot and cold cycle testing machine according to claim 1, characterized in that: A transparent observation window is fixed on the surface of the cabinet door (3) to facilitate observation of the test status of the sample inside the test chamber. A sealing strip is fixed on the edge of the cabinet door (3), and the sealing strip is in contact with the edge of the hatch of the test cabinet (2). The pulley on the surface of the limiting slide (9) is in contact with the surface of the limiting slide rail (8) to reduce the sliding friction loss between the limiting slide (9) and the limiting slide rail (8).

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