Fixture for detecting heat distortion temperature of polymer materials

Abstract

This utility model discloses a fixture for testing the heat distortion temperature of polymer materials, including a fixture body, a testing component mounted on the fixture body, an inner cavity formed inside the fixture body, a support and filter component disposed inside the inner cavity, a discharge pipe fixedly connected inside the fixture body, a one-way solenoid valve fixedly connected to the discharge pipe, and a first motor fixedly connected inside the fixture body. The medium inside the inner cavity is uniformly heated by an electric heating element, providing a stable heat source environment for testing. The first motor drives a first stirring frame to rotate, and the meshing structure of gears and a fixed gear disc drives a second stirring frame to rotate synchronously, forming a multi-dimensional stirring system. This greatly improves the circulation uniformity of the heated medium, effectively eliminates local temperature differences, significantly improves the accuracy and repeatability of heat distortion temperature testing, reduces measurement deviation, and provides a reliable basis for evaluating the heat resistance performance of polymer materials.

Description

Technical Field

[0001] This utility model relates to the field of testing tooling technology, specifically to a tooling for testing the heat distortion temperature of polymer materials. Background Technology

[0002] Polymer materials are materials made primarily of high molecular weight polymers with appropriate additives. Polymers are formed through polymerization reactions between monomer molecules, and their molecular chains are composed of repeating structural units. This structural characteristic endows polymer materials with unique physical and chemical properties. Heat distortion temperature testing refers to placing a polymer material sample in a liquid heating medium (such as silicone oil or mineral oil) under specified load and linear heating rate conditions, and monitoring the amount of deformation of the sample under continuous heating and stress. When the amount of deformation of the sample reaches a preset threshold, the corresponding temperature is the heat distortion temperature of the material.

[0003] In existing technologies, the heating medium tanks of existing testing fixtures are mostly single-cavity structures when heating the heating medium. However, the stirring range of the stirring device is limited, and it is impossible to form a uniform medium circulation throughout the tank. This results in significant local temperature differences in the medium during the heating process. Such temperature differences cause uneven heating of samples from different locations in the same batch, directly causing inconsistencies in the thermal deformation behavior of the material. Consequently, the measurement results of the thermal deformation temperature will have large deviations, which seriously affect the accuracy and repeatability of the evaluation of the heat resistance performance of polymer materials. Utility Model Content

[0004] The purpose of this invention is to provide a fixture for testing the heat distortion temperature of polymer materials, in order to solve the problem mentioned in the background art that the existing testing fixtures have a single-cavity heating medium tank structure. Due to the limited strength and range of the stirring device, it is impossible to achieve uniform circulation of the medium throughout the tank. During heating, significant local temperature differences are likely to occur, resulting in uneven heating of samples from different locations in the same batch. This leads to inconsistent thermal deformation behavior of the material, which in turn causes a large deviation in the heat distortion temperature measurement results, seriously affecting the accuracy and repeatability of the evaluation of the heat resistance performance of polymer materials.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a polymer material heat distortion temperature testing fixture, comprising a testing fixture body, a testing component disposed on the testing fixture body, an inner cavity opened inside the testing fixture body, a support and filter component disposed inside the inner cavity, a discharge pipe fixedly connected inside the testing fixture body, a one-way solenoid valve fixedly connected to the discharge pipe, a first motor fixedly connected inside the testing fixture body, an electric heating tube fixedly connected inside the testing fixture body, a first rotating shaft rotatably connected inside the testing fixture body, a sealing ring fixedly connected inside the testing fixture body, a first stirring frame fixedly connected to the top of the testing fixture body, a second rotating shaft rotatably connected inside the first stirring frame, a second stirring frame fixedly connected to the second rotating shaft, a fixed gear plate fixedly connected to the bottom of the inner cavity, and a gear fixedly connected to the second rotating shaft. One end of the discharge pipe is fixedly connected to the bottom of the inner cavity, the first rotating shaft is fixedly connected to the output end of the first motor, the first rotating shaft is disposed inside the sealing ring, the fixed gear plate meshes with the outside of the gear, the first motor drives the first rotating shaft to rotate, and the first stirring frame drives the second rotating shaft to rotate.

[0006] Based on the preferred embodiment of this technical solution, the testing fixture body has a matching storage groove at the corresponding position of the electric heating tube, and the electric heating tube is fixedly connected inside the storage groove of the testing fixture body.

[0007] Based on the preferred embodiment of this technical solution, two sets of gears, a second rotating shaft, and a second stirring frame are provided, and the two sets of gears, a second rotating shaft, and a second stirring frame are symmetrically distributed on the first stirring frame.

[0008] According to the preferred embodiment of this technical solution, the supporting filter assembly includes a fixed frame fixedly connected to the inner wall of the inner cavity, a supporting filter plate disposed inside the inner cavity, a mounting frame fixedly connected to the top of the supporting filter plate, and mounting bolts disposed inside the mounting frame. The supporting filter plate is disposed on the fixed frame, and the mounting bolts are threadedly connected to the inside of the fixed frame.

[0009] In a preferred embodiment of this technical solution, the filter plate has a through groove at a corresponding position of the fixing frame, and the fixing frame is disposed inside the through groove of the filter plate.

[0010] Based on the preferred embodiment of this technical solution, the detection component includes a support base disposed on the top of the support filter plate, a fixed frame fixedly connected to the top of the detection fixture body, a second motor fixedly connected to the top of the fixed frame, a threaded rod rotatably connected inside the fixed frame, a lifting frame slidably connected inside the fixed frame, a hydraulic telescopic rod fixedly connected inside the lifting frame, a mounting plate fixedly connected to the telescopic end of the hydraulic telescopic rod, a load rod fixedly connected to the bottom of the mounting plate, a limit plate fixedly connected to the load rod, a displacement sensor fixedly connected inside the load rod, and a pressure head threadedly connected to the load rod. The threaded rod is fixedly connected to the output end of the second motor, and the lifting frame is threadedly connected to the outside of the threaded rod. The second motor drives the threaded rod to rotate, and the rotating threaded rod drives the lifting frame to move.

[0011] In a preferred embodiment of this technical solution, the filter plate is provided with a matching placement groove at a corresponding position on the support seat, the support seat is placed in the placement groove of the filter plate, and the support seat is provided with a placement groove for placing polymer materials at a central position.

[0012] In the preferred embodiment of this technical solution, the fixed frame has a matching sliding groove at the corresponding position of the lifting frame, and the lifting frame slides inside the sliding groove of the fixed frame.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. The medium inside the cavity is uniformly heated by an electric heating tube, providing a stable heat source environment for testing. The first motor drives the first stirring frame to rotate, and the meshing structure of the gear and the fixed toothed disc drives the second stirring frame to operate synchronously, forming a multi-dimensional stirring system. This greatly improves the circulation uniformity of the heating medium, effectively eliminates local temperature differences, significantly improves the accuracy and repeatability of heat distortion temperature detection, reduces measurement deviation, and provides a reliable basis for evaluating the heat resistance of polymer materials.

[0015] 2. The second motor drives the threaded rod to rotate, which in turn drives the lifting frame to slide stably along the fixed frame, achieving precise lifting and positioning of the load bar and facilitating accurate docking of the indenter and the sample. The hydraulic telescopic rod can flexibly adjust the pressure of the indenter on the sample, applying a stable load to meet the load requirements of different testing standards. The displacement sensor can monitor the deformation of the sample in real time and accurately, providing precise data for determining the heat deformation temperature. The threaded connection between the indenter and the load rod allows for the replacement of indenters of different specifications according to testing needs, thereby significantly improving the loading accuracy and the accuracy of deformation measurement. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of one embodiment of the polymer material heat distortion temperature detection fixture of this utility model;

[0017] Figure 2This is a schematic diagram of the structure of the first and second stirring racks of this utility model;

[0018] Figure 3 This is a schematic diagram of the supporting filter assembly structure of this utility model;

[0019] Figure 4 This is a schematic diagram of the detection component of this utility model;

[0020] Figure 5 This is a schematic diagram of the threaded rod structure of this utility model;

[0021] Figure 6 This is a schematic diagram of the displacement sensor structure of this utility model.

[0022] In the diagram: 1. Detection fixture body; 21. First motor; 22. First rotating shaft; 23. Sealing ring; 24. First stirring frame; 25. Second rotating shaft; 26. Second stirring frame; 27. Fixed gear plate; 28. Gear; 29. ​​Support filter plate; 210. Fixed frame; 211. Mounting frame; 212. Mounting bolt; 213. Electric heating tube; 31. Support base; 32. Fixed frame; 33. Second motor; 34. Threaded rod; 35. Lifting frame; 36. Hydraulic telescopic rod; 37. Mounting plate; 38. Load rod; 39. Limiting plate; 310. Pressure head; 311. Displacement sensor; 4. Inner cavity; 5. Discharge pipe; 6. One-way solenoid valve. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-6This utility model provides an embodiment of a polymer material heat distortion temperature testing fixture, including a fixture body 1, a testing component disposed on the fixture body 1, an inner cavity 4 formed inside the fixture body 1, a support and filter component disposed inside the inner cavity 4, a discharge pipe 5 fixedly connected inside the fixture body 1, a one-way solenoid valve 6 fixedly connected to the discharge pipe 5, a first motor 21 fixedly connected inside the fixture body 1, an electric heating tube 213 fixedly connected inside the fixture body 1, a first rotating shaft 22 rotatably connected inside the fixture body 1, and a component fixedly connected to the testing fixture body 1. The apparatus consists of a sealing ring 23 inside the main body 1, a first stirring frame 24 fixedly connected to the top of the main body 1, a second rotating shaft 25 rotatably connected inside the first stirring frame 24, a second stirring frame 26 fixedly connected to the second rotating shaft 25, a fixed gear 27 fixedly connected to the bottom of the inner cavity 4, and a gear 28 fixedly connected to the second rotating shaft 25. One end of the discharge pipe 5 is fixedly connected to the bottom of the inner cavity 4. The first rotating shaft 22 is fixedly connected to the output end of the first motor 21. The first rotating shaft 22 is located inside the sealing ring 23, and the fixed gear 27 meshes with the outside of the gear 28. The first rotating shaft 27 is driven by the first motor 21. The rotating shaft 22 rotates, driving the second rotating shaft 25 to rotate via the first stirring frame 24. The electric heating tube 213 uniformly heats the medium within the inner cavity 4, providing a stable heat source environment for testing. The first motor 21 drives the first stirring frame 24 to rotate, which, in conjunction with the meshing structure of the gear 28 and the fixed gear disc 27, drives the second stirring frame 26 to operate synchronously, forming a multi-dimensional stirring system. This greatly improves the circulation uniformity of the heating medium, effectively eliminates local temperature differences, significantly improves the accuracy and repeatability of heat distortion temperature detection, reduces measurement deviation, and provides a reliable basis for evaluating the heat resistance of polymer materials. (Detection component) The second motor 33 drives the threaded rod 34 to rotate, which in turn drives the lifting frame 35 to slide stably along the fixed frame 32, achieving precise lifting and positioning of the load rod 38 and facilitating accurate docking of the pressure head 310 with the sample. The hydraulic telescopic rod 36 can flexibly adjust the pressure of the pressure head 310 on the sample, applying a stable load to meet the load requirements of different testing standards. The displacement sensor 311 can monitor the deformation of the sample in real time and provide accurate data for determining the heat deformation temperature. The threaded connection between the pressure head 310 and the load rod 38 facilitates the replacement of different specifications of the pressure head 310 according to testing needs, thereby significantly improving the loading accuracy and the accuracy of deformation measurement.

[0025] Please see Figure 2A further solution based on this embodiment is as follows: the detection fixture body 1 has a matching storage groove at the corresponding position of the electric heating tube 213. The electric heating tube 213 is fixedly connected inside the storage groove of the detection fixture body 1. By fixing the electric heating tube 213 in the matching storage groove, it can not only play a role in the stable installation of the electric heating tube 213 and prevent it from shifting or shaking due to vibration during the operation of the device, thus ensuring the stability of the heating position, but also make the connection between the electric heating tube 213 and the detection fixture body 1 tighter and reduce heat loss.

[0026] Please see Figure 2 A further solution based on this embodiment is as follows: two sets of gears 28, second rotating shafts 25, and second stirring racks 26 are provided. The two sets of gears 28, second rotating shafts 25, and second stirring racks 26 are symmetrically distributed on the first stirring rack 24. By setting two sets of symmetrically distributed gears 28, second rotating shafts 25, and second stirring racks 26, when the first stirring rack 24 rotates, the two sets of second stirring racks 26 can simultaneously stir the heating medium in the inner cavity 4 from both sides, forming a symmetrical convection circulation, further enhancing the mixing effect of the heating medium, avoiding the problem of uneven medium circulation, making the temperature distribution of the heating medium more uniform, thereby ensuring the consistency of the sample heating at different positions and improving the repeatability of the test results.

[0027] Please see Figure 2-3 A further embodiment of this solution is as follows: the supporting filter assembly includes a fixed frame 210 fixedly connected to the inner wall of the inner cavity 4, a supporting filter plate 29 disposed inside the inner cavity 4, a mounting frame 211 fixedly connected to the top of the supporting filter plate 29, and mounting bolts 212 disposed inside the mounting frame 211. The supporting filter plate 29 is disposed on the fixed frame 210, and the mounting bolts 212 are threadedly connected to the inside of the fixed frame 210. The fixed frame 210 provides a stable mounting base for the supporting filter plate 29. The cooperation between the mounting frame 211 and the mounting bolts 212 can firmly fix the supporting filter plate 29 to the fixed frame 210, preventing it from shifting during stirring and ensuring the stability of the sample placement. The supporting filter plate 29 can filter impurities in the heating medium, which facilitates the cleaning or replacement of the supporting filter plate 29 in the later stage, improving the maintenance convenience of the device.

[0028] Please see Figure 3A further solution based on this embodiment is as follows: a through groove is provided on the supporting filter plate 29 at the corresponding position of the fixing frame 210. The fixing frame 210 is set inside the through groove of the supporting filter plate 29. Through the cooperation between the through groove on the supporting filter plate 29 and the fixing frame 210, the fixing frame 210 can be embedded inside the through groove, which increases the contact area between the supporting filter plate 29 and the fixing frame 210, further improving the stability of the supporting filter plate 29 installation, preventing it from shaking or tilting during device operation, ensuring that the sample on the top of the supporting filter plate 29 is always in a horizontal and stable state, and providing a reliable sample placement foundation for accurate detection.

[0029] Please see Figure 4-6 A further solution based on this embodiment is as follows: the detection component includes a support base 31 disposed on the top of the support filter plate 29, a fixed frame 32 fixedly connected to the top of the detection fixture body 1, a second motor 33 fixedly connected to the top of the fixed frame 32, a threaded rod 34 rotatably connected inside the fixed frame 32, a lifting frame 35 slidably connected inside the fixed frame 32, a hydraulic telescopic rod 36 fixedly connected inside the lifting frame 35, a mounting plate 37 fixedly connected to the telescopic end of the hydraulic telescopic rod 36, a load rod 38 fixedly connected to the bottom of the mounting plate 37, a limiting plate 39 fixedly connected to the load rod 38, a displacement sensor 311 fixedly connected inside the load rod 38, and a pressure head 310 threadedly connected to the load rod 38. The threaded rod 34 is fixedly connected to the output end of the second motor 33. The threaded connection 35 is external to the threaded rod 34. The second motor 33 drives the threaded rod 34 to rotate, which in turn drives the lifting frame 35 to move. The second motor 33 drives the threaded rod 34 to rotate, which in turn drives the lifting frame 35 to slide stably along the fixed frame 32, achieving precise lifting and positioning of the load rod 38, facilitating accurate docking of the pressure head 310 with the sample. The hydraulic telescopic rod 36 can flexibly adjust the pressure of the pressure head 310 on the sample, applying a stable load to meet the load requirements of different testing standards. The displacement sensor 311 can accurately monitor the deformation of the sample in real time, providing accurate data for determining the heat deformation temperature. The threaded connection between the pressure head 310 and the load rod 38 allows for the replacement of different specifications of the pressure head 310 according to testing needs, thereby significantly improving the loading accuracy and the accuracy of deformation measurement.

[0030] Please see Figure 4A further solution based on this embodiment is as follows: the support filter plate 29 has a matching placement groove at the corresponding position of the support base 31, the support base 31 is placed in the placement groove of the support filter plate 29, and the support base 31 has a placement groove for placing polymer materials at the center position. The support base 31 is positioned by the placement groove on the support filter plate 29 to ensure the accuracy and stability of the installation position of the support base 31 and to avoid its displacement during the testing process. The placement groove at the center position of the support base 31 can limit the polymer material sample, ensuring that the sample is always in the center of force, so that the load is applied more evenly, reducing the detection error caused by the sample placement deviation and improving the reliability of the test results.

[0031] Please see Figure 5 A further solution based on this embodiment is as follows: the fixed frame 32 has a matching groove at the corresponding position of the lifting frame 35. The lifting frame 35 slides inside the groove of the fixed frame 32. Through the cooperation between the groove on the fixed frame 32 and the lifting frame 35, the groove guides and limits the movement of the lifting frame 35, ensuring that the lifting frame 35 slides stably along a straight line under the drive of the threaded rod 34, avoiding the lifting frame 35 from tilting or jamming, thereby ensuring the accurate movement trajectory of the load rod 38 and the pressure head 310, and further improving the stability and detection accuracy of the loading.

[0032] Working principle: First, the filter plate 29 is fixed to the fixed frame 210 using the mounting bracket 211 and mounting bolts 212. Then, the polymer material sample is placed in the central placement groove of the support base 31, and the support base 31 is placed in the placement groove of the filter plate 29 to ensure that the sample is stably in the center of force. Subsequently, the second motor 33 starts and drives the threaded rod 34 to rotate, so that the lifting frame 35 slides stably along the slide groove of the fixed frame 32, driving the load rod 38 to descend until the pressure head 310 accurately aligns with the sample surface. The hydraulic telescopic rod 36 adjusts the pressure according to the testing standard, and applies a stable load to the sample through the load rod 38. Then, the electric heating tube 213 is activated in the receiving groove, which applies pressure to the inner cavity 4. The heating medium is heated, and at the same time, the first motor 21 drives the first rotating shaft 22 and the first stirring frame 24 to rotate. The gears 28 on both sides mesh with the fixed gear plate 27, driving the two sets of second stirring frames 26 to rotate synchronously, so that the heating medium forms a multi-directional convection circulation to ensure uniform temperature. During this process, the displacement sensor 311 inside the load rod 38 monitors the deformation of the sample in real time. When the deformation reaches the specified threshold, the corresponding temperature is the heat deformation temperature. After the test is completed, the one-way solenoid valve 6 opens, and the heating medium is discharged through the discharge pipe 5. The support filter plate 29 can be disassembled and cleaned, and the sealing ring 23 ensures that there is no leakage of the medium throughout the process, realizing the accurate detection of the heat deformation temperature of polymer materials.

[0033] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fixture for detecting the heat distortion temperature of polymer materials, comprising a fixture body (1), characterized in that: It also includes a detection component mounted on the detection fixture body (1), an inner cavity (4) opened inside the detection fixture body (1), a support filter assembly mounted inside the inner cavity (4), a discharge pipe (5) fixedly connected inside the detection fixture body (1), a one-way solenoid valve (6) fixedly connected to the discharge pipe (5), a first motor (21) fixedly connected inside the detection fixture body (1), an electric heating tube (213) fixedly connected inside the detection fixture body (1), a first rotating shaft (22) rotatably connected inside the detection fixture body (1), a sealing ring (23) fixedly connected inside the detection fixture body (1), and a first stirring rack (24) fixedly connected to the top of the detection fixture body (1). The second rotating shaft (25) is movably connected inside the first stirring frame (24), the second stirring frame (26) is fixedly connected to the second rotating shaft (25), the fixed gear plate (27) is fixedly connected to the bottom of the inner cavity (4), and the gear (28) is fixedly connected to the second rotating shaft (25). One end of the discharge pipe (5) is fixedly connected to the bottom of the inner cavity (4). The first rotating shaft (22) is fixedly connected to the output end of the first motor (21). The first rotating shaft (22) is set inside the sealing ring (23). The fixed gear plate (27) meshes with the outside of the gear (28). The first rotating shaft (22) is driven to rotate by the first motor (21), and the second rotating shaft (25) is driven to rotate by the first stirring frame (24).

2. The fixture for detecting the heat distortion temperature of polymer materials according to claim 1, characterized in that: The testing fixture body (1) has a matching storage slot at the corresponding position of the electric heating tube (213), and the electric heating tube (213) is fixedly connected inside the storage slot of the testing fixture body (1).

3. The fixture for detecting the heat distortion temperature of polymer materials according to claim 1, characterized in that: Two sets of gears (28), second rotating shaft (25) and second stirring frame (26) are provided. The two sets of gears (28), second rotating shaft (25) and second stirring frame (26) are symmetrically distributed on the first stirring frame (24).

4. The fixture for detecting the heat distortion temperature of polymer materials according to claim 1, characterized in that: The filter support assembly includes a fixed frame (210) fixedly connected to the inner wall of the inner cavity (4), a filter support plate (29) disposed inside the inner cavity (4), a mounting frame (211) fixedly connected to the top of the filter support plate (29), and mounting bolts (212) disposed inside the mounting frame (211). The filter support plate (29) is disposed on the fixed frame (210), and the mounting bolts (212) are threadedly connected to the inside of the fixed frame (210).

5. The fixture for detecting the heat distortion temperature of polymer materials according to claim 4, characterized in that: The filter plate (29) has a through groove at the corresponding position of the fixing frame (210), and the fixing frame (210) is set inside the through groove of the filter plate (29).

6. The fixture for detecting the heat distortion temperature of polymer materials according to claim 1, characterized in that: The testing assembly includes a support base (31) set on top of the support filter plate (29), a fixed frame (32) fixedly connected to the top of the testing fixture body (1), a second motor (33) fixedly connected to the top of the fixed frame (32), a threaded rod (34) rotatably connected inside the fixed frame (32), a lifting frame (35) slidably connected inside the fixed frame (32), a hydraulic telescopic rod (36) fixedly connected inside the lifting frame (35), a mounting plate (37) fixedly connected to the telescopic end of the hydraulic telescopic rod (36), and a mounting plate (38) fixedly connected to the mounting plate (39). The mounting plate (37) has a bottom load bar (38), a limit plate (39) fixedly connected to the load bar (38), a displacement sensor (311) fixedly connected inside the load bar (38), a pressure head (310) threadedly connected to the load bar (38), a threaded rod (34) fixedly connected to the output end of the second motor (33), and a lifting frame (35) threadedly connected to the outside of the threaded rod (34). The second motor (33) drives the threaded rod (34) to rotate, and the rotating threaded rod (34) drives the lifting frame (35) to move.

7. The fixture for detecting the heat distortion temperature of polymer materials according to claim 6, characterized in that: The filter plate (29) is provided with a matching placement groove at the corresponding position of the support base (31). The support base (31) is set in the placement groove of the filter plate (29), and the support base (31) is provided with a placement groove for placing polymer materials at the center position.

8. The fixture for detecting the heat distortion temperature of polymer materials according to claim 6, characterized in that: The fixed frame (32) has a matching groove at the corresponding position of the lifting frame (35), and the lifting frame (35) slides inside the groove of the fixed frame (32).

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