A polyphenyl ether foamed plate load force detection device

Abstract

The application discloses a kind of polyphenyl ether foamed board load force detection devices, it is related to load detection technical field, including detection frame, the middle part position of detection frame is fixedly connected with test table, controller is installed in the rear wall of detection frame, the upper surface of detection frame is installed with drive detection plate, drive detection plate is located in the eccentric position of plate body top, tension limiting balance mechanism is arranged in the inside of plate body, the initiative movement of drive detection plate itself, it can be driven by connecting crank rod trigger to drive linkage shaft to rotate, realize driving plate body to control angle of rotation, this makes drive detection plate can be in the pressure test of each of multiple areas of plate, and according to the rotation of control angle also does not make drive detection plate repeatedly cover the area that has been detected, this improvement makes detection no longer be limited to the central region of plate, but can cover foamed board surface comprehensively, provide more comprehensive, more accurate mechanical property analysis.

Description

Technical Field

[0001] This invention relates to the field of load testing technology, specifically to a load force testing device for polyphenylene ether foam boards. Background Technology

[0002] This device can evaluate the compressive strength, flexural strength, and modulus of elasticity of polyphenylene oxide foam boards by applying the same load force. These indicators are important bases for evaluating material quality and performance. During the production process, the testing device can monitor the mechanical properties of the products in real time to ensure that the product quality meets the standards and customer requirements. Products that do not meet the requirements can be identified and adjusted in time, thereby improving production efficiency and product quality.

[0003] However, compared with existing technologies, this device still has the following drawbacks in practical use:

[0004] 1. Although existing polyphenylene oxide (PPE) foam board load testing devices can ensure a constant and consistent pressure is applied to the center of the board in each test with the help of a precise drive mechanism, this design mainly focuses on the mechanical performance testing of the core area of ​​the board. When the device is used with large-sized foam boards, it is obviously insufficient to test only the center position to fully reflect its overall mechanical performance. Therefore, the drive component needs to perform pressure tests on multiple other areas of the board one by one. In order to achieve a uniform and comprehensive analysis of the surface mechanical properties of the foam board, existing technologies generally take additional measures, such as introducing precise adjustment tools or relying on manual operation to accurately adjust the testing position of the foam board. However, while precise adjustment tools can improve the accuracy of position adjustment, they will increase the complexity and cost of the equipment, while manual operation is easily affected by human factors, resulting in inconsistencies in position adjustment.

[0005] 2. Furthermore, in the prior art, the pressure applied to the central area initially will generate stress distribution within the board. This stress will spread and accumulate in all directions. Since the pressure applied by the driving component remains unchanged during subsequent tests, the residual stress caused by the previous test is not fully considered. This will cause the data obtained when different areas of the board are tested a second or multiple times to be interfered with by the residual force of the first test, thereby reducing the accuracy and reliability of the test results. More importantly, during repeated testing, the pressure applied each time will generate residual stress (i.e., pressure aftershocks) within the board. This accumulated stress will not only interfere with the accuracy of subsequent tests, but will also cause irreversible damage to the foam board itself, thus affecting the reliability of the test results.

[0006] Therefore, in view of this, the present invention proposes a load-bearing capacity detection device for polyphenylene ether foam boards to make up for and improve the deficiencies of the prior art. Summary of the Invention

[0007] To address the aforementioned technical problems, this invention provides a polyphenylene ether foam board load testing device, thereby resolving the technical issues raised in the background section.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a load-bearing capacity testing device for polyphenylene ether foam board, used for load-bearing capacity testing of the board body, including a testing frame, a test platform fixedly connected to the middle position of the testing frame, a controller installed on the rear side wall of the testing frame, a drive testing plate installed on the upper surface of the testing frame, the drive testing plate being located at an eccentric position above the board body, a balanced pressure testing mechanism being provided on the outer wall of the drive testing plate, and a tension limiting balance mechanism being provided inside the board body;

[0009] The balanced pressure detection mechanism is used to automatically and evenly change the detection position of the main body of the board;

[0010] The tension limiting and balancing mechanism is used to concentrate and gather the pressure applied during the detection of the drive detection plate.

[0011] Furthermore, the equal pressure testing mechanism includes a connecting crank fixedly connected to the outer wall of the drive testing plate. A linkage shaft is installed at the end of the connecting crank away from the drive testing plate. A sleeve plate is fixedly connected to the upper surface of the linkage shaft. A support frame is rotatably connected to the bottom of the linkage shaft. The support frame is fixedly connected to the inside of the testing frame. A lifting shaft is slidably connected evenly inside the sleeve plate. A connecting ring is rotatably connected to the lower surface of the lifting shaft. A spring adjusting shaft is fixedly connected to the end of the connecting ring away from the lifting shaft.

[0012] Furthermore, the connecting crank is C-shaped in general, and two cylindrical protrusions are fixedly connected to the outer wall of the connecting crank.

[0013] Furthermore, the outer wall of the linkage shaft is continuously provided with N-shaped grooves, and the connecting crank is slidably connected to the linkage shaft through the N-shaped grooves. The support frame is composed of three connecting rods and an incomplete arc shell, and the three connecting rods are evenly and equidistantly fixedly connected to the inner side wall of the incomplete arc.

[0014] Furthermore, the spring adjusting shaft is an overall telescopic structure, and the end of the spring adjusting shaft near the connecting crank is fixedly connected to two inclined blocks on both sides, and the cylindrical protrusion located at the bottom of the connecting crank initially fits against the upper part of the two inclined blocks on both sides.

[0015] Furthermore, the tension limiting balance mechanism includes an adjusting clamp mounted on the upper surface of the test bench. The two ends of the adjusting clamp are symmetrically hinged with hinge plates. A coil spring is sleeved on the outer wall of the hinge plate near the adjusting clamp. A triangular block is hinged to the end of the hinge plate away from the adjusting clamp. A pressure plate is fixedly connected to the upper end of the triangular block.

[0016] Furthermore, the two ends of the coil spring are fixedly connected to the adjusting clamp and the hinge plate, respectively, and the hinge plate has an adapter groove at the end near the adjusting clamp.

[0017] Furthermore, the adjusting clamp is composed of two arc-shaped patches, and the center of the two arc-shaped patches is slidably connected by a main shaft. The pressure plate is initially attached to the lower surface of the main body of the plate.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] (1) In order to solve the limitations of the existing technology in the load force detection of large-size board body, this device sets the connecting crank and the existing drive detection plate to move synchronously. Thus, only the active movement of the drive detection plate itself is needed to trigger the linkage shaft to rotate through the connecting crank, thereby driving the board body to rotate at a controlled angle. This allows the drive detection plate to perform pressure tests in multiple areas of the board one by one. Furthermore, the rotation at the controlled angle will not cause the drive detection plate to repeatedly cover the areas that have already been tested. This improvement makes the detection no longer limited to the central area of ​​the board, but can fully cover the surface of the foam board, providing a more comprehensive and accurate mechanical performance analysis, which helps to more accurately evaluate the structural integrity and load-bearing capacity of the foam board.

[0020] Furthermore, this device, by moving the connecting crank, simultaneously abuts against the trigger spring adjustment shaft, thereby driving the lifting shaft to raise the main body of the plate before rotation. This ensures that the main body of the plate remains suspended during rotation adjustment, avoiding the slight displacement or deformation caused by the contact friction between the main body of the plate and the test platform. This improves the precision and accuracy of the control rotation position adjustment. Moreover, this non-contact adjustment mechanism does not require any additional drive source, thereby reducing the complexity and cost of the main body of the equipment and improving the maintenance and energy consumption performance of the equipment.

[0021] Compared to existing technologies that rely on precise drive mechanisms or manual adjustments, this device not only avoids positional errors that occur during manual operation, thus ensuring the accuracy and stability of the test results, but also eliminates the need for additional precision adjustment tools, thereby reducing the complexity and cost of the equipment. It also reduces the space and time occupied by additional tools, thus improving the testing efficiency.

[0022] The support frame is composed of three connecting rods and an incomplete circular arc shell. The three connecting rods are evenly and equidistantly fixed to the inner wall of the incomplete circular arc, and the whole structure is located at the bottom of the linkage shaft. This causes the support frame to occupy an area of ​​an equilateral triangle. According to the balanced mechanical properties of the equilateral triangle structure, when the support frame is subjected to the external force of the linkage shaft rotation, the external force can be more evenly distributed on the three sides formed by the connecting rods, thereby reducing the concentration of local stress, improving the load-bearing capacity of the structure, and making the support frame more stable and less prone to tilting or deformation. Furthermore, the hollow design between the overall structure of the support frame can reduce the amount of material used and reduce manufacturing costs while ensuring the stability of the structure during operation.

[0023] (2) When the main body of the board is under pressure, the force on both sides will act on the hinge plate through the adjusting clamp, and further drive the pressure plate located on the lower surface of the main body of the board to move upward. This dynamic process realizes the redistribution of pressure, so that the force area on the surface of the main body of the board changes the direction of the force on both sides in this way of force transmission, thereby effectively offsetting the residual stress generated in the board when the driving detection plate applies pressure, avoiding the expansion of these residual stresses to both sides and thus affecting the subsequent test results, thereby improving the accuracy and reliability of the test data. Furthermore, by moving upward in the opposite direction through the dynamic response of the pressure plate, the pressure on the lower surface of the board can be offset in real time, so that the upper and lower surfaces of the area of ​​the main body of the board being tested are simultaneously subjected to force, thereby concentrating the pressure in the central area, effectively avoiding irreversible damage caused by repeated testing. Moreover, this design ensures that the structural performance of the main body of the board will not be damaged when subjected to multiple test pressures, protecting the integrity and mechanical properties of the foam board.

[0024] The adjusting clamp is composed of two arc-shaped patches, which are slidably connected at their center via a main shaft. This design allows the device to be easily adjusted to accommodate plates of different sizes and shapes. This flexibility ensures that the equipment can be applied to a wider range of testing scenarios, improving equipment utilization and testing efficiency. Furthermore, this method eliminates the need to replace the entire clamp or device; simply adjusting the distance between the two arc-shaped patches allows for load testing of specimens of different sizes.

[0025] The device features a coil spring at the junction of the hinge plate and the adjusting clamp for buffering and resetting. An adapter groove is provided on the end of the hinge plate near the adjusting clamp. The combined action of the adapter groove and the coil spring ensures the device maintains stable motion. The resetting force provided by the coil spring allows the hinge plate to quickly stabilize after reaching the predetermined position. Furthermore, the adapter groove makes the hinge plate thinner at the connection point, thus ensuring flexible movement between the hinge plate and the adjusting clamp. Attached Figure Description

[0026] Figure 1 This is a front-view three-dimensional structural schematic diagram of the present invention;

[0027] Figure 2 This is a top-view three-dimensional structural diagram of the present invention;

[0028] Figure 3 This is a three-dimensional structural diagram of the equal pressure detection mechanism of the present invention;

[0029] Figure 4 This is a three-dimensional structural diagram of the linkage shaft component of the present invention;

[0030] Figure 5 This is an exploded view of the equal pressure detection mechanism of the present invention;

[0031] Figure 6 This is a three-dimensional structural diagram of the main components of the sheet metal of the present invention;

[0032] Figure 7 This is a three-dimensional structural diagram of the adjusting clamp component of the present invention;

[0033] Figure 8 This is a three-dimensional structural diagram of the tension limiting and balancing mechanism of the present invention;

[0034] Figure 9 This is an exploded view of the tension limiting and balancing mechanism of the present invention.

[0035] The diagram is labeled as follows: 1. Testing frame; 11. Test bench; 12. Controller; 13. Drive testing board; 14. Main body of the sheet material; 2. Balanced pressure testing mechanism; 21. Connecting crank; 22. Linkage shaft; 23. Sleeve plate; 24. Support frame; 25. Lifting shaft; 26. Assembly ring; 27. Spring adjusting shaft; 3. Tension limiting and balancing mechanism; 31. Adjusting clamp; 32. Coil spring; 33. Hinge plate; 34. Triangular locking block; 35. Pressure plate. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, those skilled in the art who have not made any innovative attempts are all within the scope of protection of the present invention;

[0037] Embodiments of the present invention

[0038] Please refer to Figures 1-2As shown, a load-bearing capacity testing device for polyphenylene ether foam board is used to test the load-bearing capacity of the board body 14. It includes a testing frame 1, a test platform 11 fixedly connected to the middle of the testing frame 1, a controller 12 installed on the rear side wall of the testing frame 1, a drive testing plate 13 installed on the upper surface of the testing frame 1, the drive testing plate 13 being located at an eccentric position above the board body 14, a balanced pressure testing mechanism 2 provided on the outer wall of the drive testing plate 13, and a tension limiting balancing mechanism 3 provided inside the board body 14.

[0039] Please refer to Figures 3-5 As shown, the balanced pressure testing mechanism 2 includes a connecting crank 21 fixedly connected to the outer wall of the drive testing plate 13. A linkage shaft 22 is installed at the end of the connecting crank 21 away from the drive testing plate 13. A sleeve plate 23 is fixedly connected to the upper surface of the linkage shaft 22. A support frame 24 is rotatably connected to the bottom of the linkage shaft 22. The support frame 24 is fixedly connected to the inside of the testing frame 1. A lifting shaft 25 is slidably connected inside the sleeve plate 23. A connecting ring 26 is rotatably connected to the lower surface of the lifting shaft 25. A spring adjusting shaft 27 is fixedly connected to the end of the connecting ring 26 away from the lifting shaft 25. The connecting crank... The overall shape of 21 is C-shaped. Two cylindrical protrusions are fixedly connected to the outer wall of the connecting crank 21. The outer wall of the linkage shaft 22 is continuously provided with N-shaped grooves. The connecting crank 21 and the linkage shaft 22 are slidably connected through the N-shaped grooves. The support frame 24 is composed of three connecting rods and an incomplete arc shell. The three connecting rods are evenly and equidistantly fixed to the inner side wall of the incomplete arc. The spring adjustment shaft 27 is a telescopic structure. The end of the spring adjustment shaft 27 near the connecting crank 21 is fixedly connected to two inclined blocks on both sides. The cylindrical protrusion located at the bottom of the connecting crank 21 is initially attached to the top of the two inclined blocks on both sides.

[0040] Specifically, the connecting crank 21 triggers the linkage shaft 22 to rotate, thereby driving the main body of the board 14 to rotate at a controlled angle. This allows the drive detection plate 13 to perform pressure tests on multiple areas of the board one by one. Furthermore, the controlled angle rotation prevents the drive detection plate 13 from repeatedly covering areas that have already been tested. This improvement allows the detection to be fully covered on the surface of the foam board, rather than being limited to the central area of ​​the board. This provides a more comprehensive and accurate analysis of mechanical properties. In addition, the contact spring adjustment shaft 27 drives the lifting shaft 25 to raise the main body of the board 14 before rotation. This ensures that the main body of the board 14 remains suspended during the rotation adjustment process, avoiding the slight displacement or deformation of the main body of the board 14 due to contact friction.

[0041] Please refer to Figures 6-9As shown, the tension limiting balance mechanism 3 includes an adjusting clamp 31 mounted on the upper surface of the test bench 11. The two ends of the adjusting clamp 31 are symmetrically hinged with hinge plates 33. The outer wall of the hinge plate 33 near the adjusting clamp 31 is fitted with a coil spring 32. The end of the hinge plate 33 away from the adjusting clamp 31 is hinged with a triangular block 34. The upper end of the triangular block 34 is fixedly connected with a pressure plate 35. The two ends of the coil spring 32 are fixedly connected to the adjusting clamp 31 and the hinge plate 33 respectively. The end of the hinge plate 33 near the adjusting clamp 31 is provided with an adapter groove. The adjusting clamp 31 is composed of two arc-shaped patches. The center of the two arc-shaped patches is slidably connected through the main shaft. The pressure plate 35 is initially attached to the lower surface of the plate body 14.

[0042] Specifically, this dynamic process achieves pressure redistribution, causing the force-bearing area on the surface of the main body 14 to change the direction of the force on both sides through this force transmission method. This effectively counteracts the residual stress generated inside the material when the driving detection plate 13 applies pressure, preventing these residual stresses from expanding to both sides and affecting subsequent test results, thereby improving the accuracy and reliability of the test data. The device has a coil spring 32 installed at the intersection of the hinge plate 33 and the adjusting clamp 31 for buffering and reset. Furthermore, an adapter groove is provided at the end of the hinge plate 33 near the adjusting clamp 31. The synergistic effect of the adapter groove and the coil spring 32 ensures that the device maintains a stable movement state. The reset force provided by the coil spring 32 allows the hinge plate 33 to quickly stabilize after reaching the predetermined position. The adapter groove also makes the hinge plate 33 thinner at the connection point, thus ensuring flexible movement between the hinge plate 33 and the adjusting clamp 31.

[0043] The following are the complete usage steps and working principle of the above embodiments:

[0044] The operating procedure of the device is as follows: Before starting the test, the staff should ensure that all working parts are working properly. Then, the main body 14 of the plate to be tested is placed in the test area of ​​the test bench 11 and fixed in the prescribed direction and position. Then, according to the size and thickness of the main body 14 of the plate to be tested, the test speed, load size and other parameters are input or adjusted in the controller 12. Finally, the device is started to trigger the drive test plate 13 to perform load force testing on the main body 14 of the plate.

[0045] The balanced pressure detection mechanism 2, used for automatically and evenly replacing the main body 14 of the sheet metal to be tested, is specifically used as follows:

[0046] like Figure 3 As shown, since the connecting crank 21 is fixedly connected to the outer wall of the drive detection plate 13, when the drive detection plate 13 moves back and forth up and down during the pressure testing of the plate body 14, the connecting crank 21 will move synchronously with it. Firstly, as shown... Figure 4As shown, two cylindrical protrusions are fixedly connected to the outer wall of the connecting crank 21, while two inclined blocks are fixedly connected to one end of the spring adjusting shaft 27 near the connecting crank 21. The lower cylindrical protrusion of the connecting crank 21 initially fits against the upper part of the two inclined blocks. Therefore, when the connecting crank 21 moves downward, the inclined blocks in the spring adjusting shaft 27 can be squeezed by the lower cylindrical protrusion on the outer wall. During this process, since the spring adjusting shaft 27 and the connecting ring 26 are rigidly fixed to each other, it means that the two remain as one unit. Since there is no degree of freedom of relative motion, when the upper surface of the spring adjusting shaft 27 is subjected to the extrusion force from the cylindrical protrusion on the outer wall of the connecting crank 21, and the cylindrical protrusion and the inclined block remain in contact and are not completely misaligned during the continuous extrusion process, this pressure will be transmitted to the assembly ring 26 along the connection path. In turn, the extrusion force applied to the spring adjusting shaft 27 will retract the lifting shaft 25 into the sleeve plate 23, thereby ensuring that the plate body 14 is accurately attached to the upper surface of the test table 11, in preparation for the subsequent load application of the driving test plate 13.

[0047] like Figure 4 and Figure 5 As shown, since the connecting crank 21 is C-shaped and the outer wall of the linkage shaft 22 is continuously provided with N-shaped grooves, and the end of the connecting crank 21 away from the drive detection plate 13 is rotatably connected to the linkage shaft 22 through the N-shaped grooves, when the drive detection plate 13 moves downward, the connecting crank 21 will first move downward along the vertical inner wall of the N-shaped groove. When the connecting crank 21 stops moving downward, the cylindrical protrusion on the upper part of the outer wall of the connecting crank 21 just fits against the lower surface of the inclined block in the spring adjusting shaft 27. Then, when the drive detection plate 13 completes the first pressure detection and moves upward to prepare for the second pressure detection... During pressure testing, the connecting crank 21 moves upward synchronously with the drive detection plate 13. At this time, the cylindrical protrusion on the lower surface of the inclined block simultaneously presses the spring adjustment shaft 27 upward. The pressing force applied to the spring adjustment shaft 27 restores the lifting shaft 25 to the top of the sleeve plate 23, thereby lifting the plate body 14 on the surface of the test table 11. This ensures that the plate body 14 remains suspended during the rotation adjustment process, avoiding the slight displacement or deformation caused by contact friction with the test table 11 during rotation, thus improving the precision and accuracy of the control rotation position adjustment.

[0048] Meanwhile, during the synchronous upward movement of the connecting crank 21 following the drive detection plate 13, the end of the connecting crank 21 away from the drive detection plate 13 will move along the inclined inner wall of the N-shaped groove. In this process, the continuous compression of the connecting crank 21 will drive the linkage shaft 22 to rotate, thereby driving the plate body 14 to rotate at a controlled angle. This allows the drive detection plate 13 to perform pressure tests on multiple areas of the plate one by one, and the rotation at the controlled angle will not cause the drive detection plate 13 to repeatedly cover the areas that have already been tested.

[0049] The tension limiting and balancing mechanism 3, used for applying pressure during the detection of the concentrated and driven detection plate 13, is specifically used as follows:

[0050] like Figure 6 As shown, the adjustment clip 31 is installed in a surrounding manner on the outside of the plate body 14, and the specific position of the adjustment clip 31 is to be installed at the position of each load force test on the plate body 14. Since the adjustment clip 31 is composed of two arc-shaped patches, and the center of the two arc-shaped patches is slidably connected by the main shaft, the adjustment clip 31 can be adapted to plate bodies 14 of different sizes for load force testing. This flexibility ensures that the equipment can be applied to a wider range of testing scenarios, improving the utilization rate and testing efficiency of the equipment.

[0051] like Figure 8 As shown, since the hinge plate 33 and the adjusting clamp 31 are movably connected by the coil spring 32, when the area to be tested of the plate body 14 is subjected to downward pressure by the driving detection plate 13, the force on both sides of the plate body 14 under pressure will act on the hinge plate 33 through the adjusting clamp 31. The hinge plate 33 will further drive the pressure plate 35 located on the lower surface of the test stage 11 to move upward in the opposite direction. In this way, the direction of the force on both sides of the plate body 14 is changed, thereby offsetting the residual stress generated inside the plate when the driving detection plate 13 applies pressure. This avoids the residual stress from expanding to both sides and affecting the subsequent test results, thereby improving the accuracy and reliability of the test data.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A load-bearing capacity testing device for polyphenylene ether foam board, used for load-bearing capacity testing of board body (14), comprising a testing frame (1), wherein a test platform (11) is fixedly connected to the middle position of the testing frame (1), a controller (12) is installed on the rear side wall of the testing frame (1), and a driving testing plate (13) is installed on the upper surface of the testing frame (1), wherein the driving testing plate (13) is located at an eccentric position above the board body (14), characterized in that: The outer wall of the drive detection plate (13) is provided with a balanced pressure detection mechanism (2), and the interior of the plate body (14) is provided with a tension limiting balance mechanism (3). The equal pressure detection mechanism (2) is used to automatically and evenly change the detection position of the main body of the plate (14); The equal pressure testing mechanism (2) includes a connecting crank (21) fixedly connected to the outer wall of the drive testing plate (13). A linkage shaft (22) is installed at the end of the connecting crank (21) away from the drive testing plate (13). A sleeve plate (23) is fixedly connected to the upper surface of the linkage shaft (22). A support frame (24) is rotatably connected to the bottom of the linkage shaft (22). The support frame (24) is fixedly connected to the inside of the testing frame (1). A lifting shaft (25) is evenly slidably connected inside the sleeve plate (23). A connecting ring (26) is rotatably connected to the lower surface of the lifting shaft (25). A spring adjusting shaft (27) is fixedly connected to the end of the connecting ring (26) away from the lifting shaft (25). The outer wall of the linkage shaft (22) is continuously provided with N-shaped grooves. The connecting rod (21) and the linkage shaft (22) are slidably connected through the N-shaped grooves. The support frame (24) is composed of an incomplete arc shell and three connecting rods, and the three connecting rods are evenly and equidistantly fixed to the inner wall of the incomplete arc shell. By connecting the crank (21) to trigger the linkage shaft (22) to rotate, the main body of the plate (14) is rotated by a controlled angle, so that the driving detection plate (13) can perform pressure tests in multiple areas of the main body of the plate (14). The tension limiting balance mechanism (3) is used to concentrate the pressure applied during the detection of the convergence drive detection plate (13).

2. The load-bearing capacity testing device for polyphenylene ether foamed board according to claim 1, characterized in that: The connecting crank (21) is C-shaped in general, and two cylindrical protrusions are fixedly connected to the outer wall of the connecting crank (21).

3. The load-bearing capacity testing device for polyphenylene ether foamed board according to claim 1, characterized in that: The spring adjusting shaft (27) is a telescopic structure. The end of the spring adjusting shaft (27) near the connecting crank (21) is fixedly connected to two inclined blocks on both sides, and the cylindrical protrusion located at the bottom of the connecting crank (21) is initially attached to the top of the two inclined blocks on both sides.

4. The load-bearing capacity testing device for polyphenylene ether foamed board according to claim 1, characterized in that: The tension limiting balance mechanism (3) includes an adjusting clamp (31) installed on the upper surface of the test bench (11). The two ends of the adjusting clamp (31) are symmetrically hinged with hinge plates (33). The outer wall of the hinge plate (33) near the adjusting clamp (31) is fitted with a coil spring (32). The end of the hinge plate (33) away from the adjusting clamp (31) is hinged with a triangular block (34). The upper end of the triangular block (34) is fixedly connected with a pressure plate (35).

5. The load-bearing capacity testing device for polyphenylene ether foamed board according to claim 4, characterized in that: The two ends of the coil spring (32) are fixedly connected to the adjusting clamp (31) and the hinge plate (33) respectively, and the hinge plate (33) has an adapter groove at the end near the adjusting clamp (31).

6. The load-bearing capacity testing device for polyphenylene ether foamed board according to claim 4, characterized in that: The adjusting clip (31) is composed of two arc-shaped patches, and the center of the two arc-shaped patches is slidably connected by the main shaft. The pressure plate (35) is initially attached to the lower surface of the main body (14) of the plate.

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