Device for detecting freeze-thaw cycle resistance of modified asphalt of surface layer of high and cold frozen soil region
The integrated design of the asphalt freeze-thaw cycle performance testing device enables efficient and highly functional multi-performance testing, solving the problem of single function of traditional equipment. It is suitable for testing modified asphalt in high-altitude and cold permafrost regions.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-20
- Publication Date
- 2026-03-24
AI Technical Summary
Traditional asphalt performance testing equipment has limited functionality, low efficiency, and difficulty in simultaneously testing multiple properties of asphalt. This is especially true in applications in high-altitude and permafrost regions, where testing for freeze-thaw cycle resistance is particularly important.
An integrated device for testing the freeze-thaw cycle performance of asphalt was designed, comprising a refrigeration unit, a compressive strength testing component, a splitting tool, a strength testing component, and an auxiliary mechanism. The device enables simultaneous testing of the splitting strength and compressive strength of asphalt specimens through a linkage component, and controls the water bath temperature uniformity and performs air drying through the auxiliary mechanism.
It improves testing efficiency, enhances testing functionality, ensures testing accuracy and precision in high-altitude permafrost regions, and avoids damage to asphalt specimens caused by traditional methods.
Smart Images
Figure CN121721077A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of asphalt performance testing technology, specifically to a device for testing the freeze-thaw cycle resistance of modified asphalt in high-altitude permafrost regions. Background Technology
[0002] In high-altitude permafrost regions, modified asphalt used in the surface layer must possess excellent freeze-thaw cycle resistance to cope with extreme climates. These regions are characterized by prolonged periods of low temperatures, frequent freeze-thaw cycles, and large diurnal temperature variations. If the modified asphalt used as a surface layer material lacks sufficient freeze-thaw cycle resistance, it will exhibit cracking, spalling, and loosening, severely impacting the stability and service life of the pavement structure. Therefore, testing its freeze-thaw cycle resistance is a crucial step in ensuring the quality of road engineering projects in high-altitude permafrost regions.
[0003] Traditional asphalt performance testing usually requires the cooperation of multiple independent institutions, resulting in low testing efficiency. Furthermore, the testing process typically only tests a single property of the asphalt, thereby reducing its functionality in use. Summary of the Invention
[0004] To address the shortcomings of existing technologies, this invention provides a device for testing the freeze-thaw cycle resistance of modified asphalt in high-altitude permafrost regions, thus solving the problem of limited functionality in existing testing equipment.
[0005] To achieve the above objectives, the present invention provides the following technical solution: a device for testing the freeze-thaw cycle resistance of modified asphalt surface layers in high-altitude permafrost regions, comprising a body, wherein a refrigeration device is provided inside the body, an inner seat is fixedly installed on the inner side of the body via rods, a placement plate is provided at the center of the inner side of the inner seat, a first opening and a second opening are respectively provided through the bottom surface of the inner seat and the bottom surface of the placement plate, an arc-shaped plate is symmetrically provided on the inner side of the inner seat, a moving plate is connected to one side of the arc-shaped plate via a second telescopic rod, a compressive strength testing component is installed on one side of the moving plate, a lower pressure plate is provided on the inner side of the body, a splitting tool is connected to the bottom surface of the lower pressure plate via a first telescopic rod, a strength testing component is provided inside the first telescopic rod, a linkage component is connected to the top surface of the lower pressure plate, and an auxiliary mechanism is provided at the bottom of the inner side of the body.
[0006] Through the above-mentioned technical means, multiple auxiliary testing components are integrated into the machine body during use, thereby replacing multiple mechanisms in the traditional technology, increasing the testing efficiency. At the same time, through the setting of linkage components, the pressure splitting strength of asphalt specimens can be tested simultaneously with their pressure strength, increasing the functionality of the test.
[0007] Preferably, the pressure resistance detection component includes a second pressure sensor and a third spring. The second pressure sensor is fixedly installed on one side of the movable plate, and the third spring is disposed between the arc-shaped plate and the movable plate, with both ends of the third spring connected to the second pressure sensor and the arc-shaped plate, respectively.
[0008] Preferably, the second telescopic rod is provided with a second spring inside.
[0009] Preferably, the strength detection component includes a first pressure sensor and a first spring. The first pressure sensor is installed on the inner end of the first telescopic rod, and the first spring is disposed inside the first telescopic rod, with one end of the first spring connected to the first pressure sensor.
[0010] Preferably, the linkage assembly includes a threaded rod, a threaded cylinder, a worm, a worm wheel, a connecting rod, a sprocket, a chain, and a bidirectional lead screw. The bidirectional lead screw passes through two movable plates. The threaded rod is fixedly installed on the top surface of the lower pressure plate. The threaded cylinder is sleeved on the outside of the threaded rod. The worm is fixedly sleeved on the outside of the threaded cylinder. The worm wheel is located on one side of the worm and meshes with the worm. The connecting rod is fixedly installed on one side of the worm wheel. The two sprockets are respectively fixedly installed at one end of the bidirectional lead screw and the connecting rod. The chain is meshed between the two sprockets.
[0011] Preferably, a mounting frame is fixedly installed on the top surface of the machine body, a drive housing is installed on the top of the mounting frame, a second motor is provided inside the drive housing, and the output end of the second motor is connected to the worm gear, and rollers are rotatably installed inside the two arc-shaped plates.
[0012] Preferably, a second guide rod is symmetrically installed on the top surface of the lower pressure plate, and the top end of the second guide rod is fixedly installed on the inner side of the mounting frame. A first guide rod is symmetrically installed on the bottom surface of the lower pressure plate, and the bottom end of the first guide rod is connected to the splitting blade. A smooth rod passes through between the two moving plates. Uprights are fixedly installed at the four corners of the bottom surface of the machine body. A base plate is fixedly installed between the uprights. A water tank is provided on the top of the base plate. A water pump is connected to the top surface of the water tank. One end of the water pump is connected to a water pump, and the water pump is installed on the top surface of the machine body. A vacuum pump is installed on the top surface of the machine body. A sealing door is installed on one side of the machine body via a hinge. A control panel is provided on one side of the machine body. A drain pipe is connected to the bottom surface of the machine body.
[0013] Preferably, the auxiliary mechanism includes fan blades, a second rotating rod, and an air guide plate. The second rotating rod is rotatably mounted on the bottom of the machine body, the fan blades are fixedly mounted on the outer surface of the second rotating rod, and the air guide plate is symmetrically mounted on the top surface of the inner seat via hinges.
[0014] Preferably, the auxiliary mechanism may also be a first rotating rod and a stirring rod, wherein the first rotating rod is rotatably mounted on the bottom of the machine body, and the stirring rod is fixedly mounted on the outer surface of the first rotating rod.
[0015] Preferably, a first motor is fixedly mounted on the bottom surface of the machine body via a fixing frame, and the output end of the first motor is connected to a first rotating rod or a second rotating rod.
[0016] Working principle: When in use, the machine body can be placed in the designated position, the sealed door can be opened and the asphalt specimen can be placed inside the placement tray. The sealed door can be closed and the internal cooling device of the machine body can be turned on, so that the low temperature environment inside the machine body can be simulated to test the freeze-thaw cycle performance of the asphalt specimen. By turning on the water pump, the heated water bath water inside the water tank can be drawn into the machine body, so that the asphalt specimen can be water bathed. The water bath water can be discharged through the drain pipe. When testing the splitting strength of asphalt specimens, a second motor is activated. The second motor drives a worm gear to rotate, which in turn drives a worm wheel to rotate. The worm wheel then drives a threaded cylinder to rotate, which in turn drives a threaded rod to extend. The threaded rod pushes a lower pressure plate downwards. The lower pressure plate, through a first telescopic rod, drives the splitting tool downwards. Simultaneously, the worm gear drives a worm wheel to rotate, which, through a connecting rod, drives a sprocket and chain to rotate. The sprocket and chain drive a double-acting screw to rotate, which in turn drives a moving plate to move. The moving plate, through a second telescopic rod, moves an arc-shaped plate relative to the asphalt specimen. The arc-shaped plate positions the asphalt specimen. When the splitting tool makes contact with the dynamic contact of the asphalt specimen, the splitting tool continues to move downwards. At this time, the first telescopic rod retracts and compresses the first spring. The first pressure sensor detects the deformation and elasticity of the first spring, thereby testing the splitting strength of the asphalt specimen. Simultaneously, the two arc-shaped plates continue to move relative to each other, compressing the asphalt specimen inwards. The arc-shaped plates compress a third spring inwards, and the second pressure sensor detects the elasticity of the third spring, thus testing the compressive strength of the asphalt specimen. Furthermore, during the water bath, the first motor can be turned on, which drives the stirring rod to rotate. The stirring rod stirs the water in the water bath to increase the uniformity of the water temperature and ensure the accuracy of subsequent asphalt specimen testing. After the water bath, the first motor can drive the second rotating rod to rotate, which in turn drives the fan blades to rotate. The fan blades blow air upwards, and the airflow is guided by the air guide plate to contact the surface of the asphalt specimen, thereby drying the water stains on the surface of the asphalt specimen, which is convenient for subsequent testing.
[0017] This invention provides a device for testing the freeze-thaw cycle resistance of modified asphalt surface layers in high-altitude permafrost regions. It has the following beneficial effects: 1. This invention integrates a machine body that can test the splitting strength of asphalt while simulating a cold environment, thus replacing multiple separate testing mechanisms and increasing testing efficiency. At the same time, while testing the splitting strength of asphalt, it can also test the compressive strength of asphalt simultaneously, thereby increasing the functionality of the equipment during use.
[0018] 2. This invention incorporates an auxiliary mechanism. During the water bath process of asphalt, the first rotating rod in the auxiliary mechanism drives the stirring rod to rotate, thereby stirring the water inside the machine. This increases the uniformity of water temperature during the water bath, eliminates temperature gradients, and ensures the accuracy of the test.
[0019] 3. This invention proposes another structure through an auxiliary mechanism. After the asphalt water bath is completed, the fan blades can be rotated by the second rotating rod, which can blow air in the direction of the inner seat. The first and second openings allow the airflow to flow upwards. The airflow is guided by the air guide plate, which allows the airflow to contact the surface of the asphalt specimen, thereby drying the moisture on the asphalt surface. Furthermore, the non-contact treatment avoids the interference and damage to the asphalt specimen caused by traditional wiping, ensuring the conditions for subsequent testing. Attached Figure Description
[0020] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a side view of the structure of the present invention; Figure 3 This is a schematic diagram of the internal structure of the present invention; Figure 4 This is a schematic diagram of the position of the first rotating rod in this invention. Figure 5 This is a schematic diagram of the inner seat structure of the present invention; Figure 6 This is a schematic diagram of the arc-shaped plate position structure of the present invention; Figure 7 This is a schematic diagram of the position structure of the first telescopic rod of the present invention; Figure 8 This is a schematic diagram of the linkage component structure of the present invention; Figure 9 This is a schematic diagram of the first spring position structure of the present invention; Figure 10 This is a schematic diagram of the second spring position structure of the present invention.
[0021] The components include: 1. Body; 2. Base plate; 3. Upright pole; 4. Water tank; 5. Water pump; 6. Pumping pipe; 7. Mounting frame; 8. Drive housing; 9. Sealing door; 10. Control panel; 11. Drain pipe; 12. Vacuum pump; 13. Inner seat; 14. First motor; 15. Fan blade; 16. First rotating rod; 17. Stirring rod; 18. Second rotating rod; 19. Air guide plate; 20. Splitting blade; 21. First telescopic rod; 2101. First pressure sensor; 2102. First spring; 22. 23. First guide rod; 24. Lower pressure plate; 25. Second guide rod; 26. Threaded rod; 27. Threaded cylinder; 28. Placement plate; 29. First opening; 20. Second opening; 31. Bidirectional lead screw; 32. Smooth rod; 33. Arc plate; 34. Roller; 35. Second telescopic rod; 36. Second spring; 37. Chain; 48. Third spring; 39. Second pressure sensor; 40. Worm gear; 41. Worm wheel; 42. Second motor; 43. Connecting rod; 44. Sprocket; 45. Moving plate. Detailed Implementation
[0022] The technical solution of the present invention will now be clearly and completely described 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, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0023] Example 1:
[0024] Please see the appendix Figure 1 Appendix Figure 2 Appendix Figure 3 Appendix Figure 5 and attached Figure 7 This invention provides a device for testing the freeze-thaw cycle resistance of modified asphalt surface layers in high-altitude permafrost regions. The device includes a body 1, with a refrigeration unit inside. An inner seat 13 is fixedly installed on the inner side of the body 1 via rods. A placement plate 27 is located at the center of the inner side of the inner seat 13. A first opening 28 and a second opening 29 are respectively formed through the bottom surface of the inner seat 13 and the bottom surface of the placement plate 27. A curved plate 32 is symmetrically arranged on the inner side of the inner seat 13. A moving plate 43 is connected to one side of the curved plate 32 via a second telescopic rod 34. A compressive strength testing component is installed on one side of the moving plate 43. A lower pressure plate 23 is located on the inner side of the body 1. A splitting tool 20 is connected to the bottom surface of the lower pressure plate 23 via a first telescopic rod 21. A strength testing component is located inside the first telescopic rod 21. A linkage component is connected to the top surface of the lower pressure plate 23. An auxiliary mechanism is located at the bottom of the inner side of the body 1.
[0025] Specifically, the refrigeration equipment inside the unit 1 is similar to a freezer. The main components of the refrigeration equipment consist of a compressor, condenser, capillary tube, and evaporator. The compressor first draws in low-temperature, low-pressure gaseous refrigerant and compresses it into a high-temperature, high-pressure gaseous state. Then, the high-temperature, high-pressure gaseous refrigerant enters the condenser located outside the freezer, where it releases heat after exchanging heat with the outside air, cooling into a medium-temperature, high-pressure liquid state. Next, the liquid refrigerant flows through the capillary tube, where its pressure drops sharply due to the throttling and pressure reduction effect of this small tube, becoming a low-temperature, low-pressure gas-liquid mixture. Finally, this low-temperature, low-pressure gas-liquid mixture enters the evaporator inside the freezer, where it rapidly evaporates into a gaseous state, absorbing heat from inside the freezer and lowering the internal temperature. The refrigerant, after evaporation and returning to a low-temperature, low-pressure gaseous state, is then re-compressed by the compressor. The process of inhalation and repetition achieves cooling of the internal space of the machine body 1. The refrigeration equipment used in this device is a commonly used refrigeration equipment in existing technology, so its specific model and structure will not be described in detail here. By setting up the refrigeration equipment, the internal temperature of the machine body 1 can be regulated, thereby creating a low-temperature environment for testing the freeze-thaw cycle of the asphalt test tube. A placement plate 27 is provided at the center of the inner seat 13. During use, the asphalt test piece can be placed inside the placement plate 27. A first opening 28 and a second opening 29 are provided through the plate. When the asphalt is subjected to a water bath, the water in the water bath inside the machine body 1 can be used to wet the asphalt test tube placed inside the placement plate 27 through the first opening 28 and the second opening 29, thereby ensuring that the water in the water bath covers the asphalt test tube and ensures that the asphalt test tube is fully immersed in water.
[0026] Example 2:
[0027] Please see the appendix Figure 6 and attached Figure 10 This embodiment is used to test the compressive strength of asphalt specimens. The compressive strength testing component includes a second pressure sensor 37 and a third spring 36. The second pressure sensor 37 is fixedly installed on one side of the moving plate 43. The third spring 36 is disposed between the arc plate 32 and the moving plate 43, and the two ends of the third spring 36 are respectively connected to the second pressure sensor 37 and the arc plate 32. The second telescopic rod 34 is provided with a second spring 3401 inside.
[0028] Specifically, the two arc-shaped plates 32 have identical specifications and are equidistant from the center of the placement tray 27. Therefore, when the two arc-shaped plates 32 move relative to each other simultaneously, they clamp the asphalt placed on top of the placement tray 27. This initial clamping prevents displacement of the asphalt specimen during the splitting crack test. When the moving plate 43 moves relative to each other, and the second telescopic rod 34 drives the two arc-shaped plates 32 to move relative to each other, the arc-shaped plates 32 continuously compress the asphalt specimen. At this time, the arc-shaped plates 32 experience resistance, which is transmitted to the second telescopic rod 34, causing the second telescopic rod 34 to extend and retract accordingly. The second spring 3401 is squeezed inward, which causes the arc plate 32 to move continuously for a certain distance. When the arc plate 32 continues to move relative to the asphalt specimen and squeezes it, the arc plate 32 squeezes the third spring 36 inward. The third spring 36 is squeezed, and it will exert a pushing force on both sides through its elastic potential energy. The second pressure sensor 37 detects the pushing force of the second spring 3401. The greater the squeezing force of the two arc plates 32 on the asphalt specimen, the greater the squeezing force of the arc plate 32 on the third spring 36, which can represent the higher compressive strength of the asphalt specimen. This can be used to detect the compressive performance of the asphalt specimen.
[0029] Example 3:
[0030] Please see the appendix Figure 7 and attached Figure 9 This embodiment is used to test the fracture strength of asphalt specimens. The strength testing component includes a first pressure sensor 2101 and a first spring 2102. The first pressure sensor 2101 is installed on the inner end of the first telescopic rod 21, and the first spring 2102 is disposed inside the first telescopic rod 21, with one end of the first spring 2102 connected to the first pressure sensor 2101.
[0031] Specifically, the splitting blade 20 is vertically positioned and directly opposite the diameter of the placement plate 27. Since the asphalt specimens for splitting tests are mostly cylindrical, when the asphalt specimen is placed inside the placement plate 27 and coincides with the center of the plate 27, the splitting blade 20 moves downward to split the asphalt specimen. The splitting blade can be directly opposite the diameter of the asphalt specimen, thus ensuring uniform stress distribution and accurate test results. When the splitting blade 20 moves downward and comes into contact with the asphalt specimen, the continuous downward pressure will cause the first telescopic rod 21 to retract, thereby squeezing the first spring 2102 inward. The first spring 2102 can release thrust to both ends through elastic potential energy. The first pressure sensor 2101 detects the thrust, and the downward pressure of the splitting blade is detected, thereby allowing the splitting strength of the asphalt specimen to be tested.
[0032] Example 4:
[0033] Please see the appendix Figure 8This embodiment is used to effectively link splitting strength testing and compressive strength testing. The linkage component includes a threaded rod 25, a threaded cylinder 26, a worm 38, a worm wheel 39, a connecting rod 41, a sprocket 42, a chain 35, and a bidirectional lead screw 30. The bidirectional lead screw 30 passes through two moving plates 43. The threaded rod 25 is fixedly installed on the top surface of the lower pressure plate 23. The threaded cylinder 26 is sleeved on the outside of the threaded rod 25. The worm 38 is fixedly sleeved on the outside of the threaded cylinder 26. The worm wheel 39 is located on one side of the worm 38 and is meshed with the worm 38. The connecting rod 41 is fixedly installed on one side of the worm wheel 39. Two sprockets 42 are respectively fixedly installed on one end of the bidirectional lead screw 30 and the connecting rod 41. The chain 35 is meshed between the two sprockets 42.
[0034] Specifically, the threaded cylinder 26 and the threaded rod 25 are connected by threads. When the threaded cylinder 26 rotates and limits the threaded rod 25, it can cause the threaded rod 25 to extend inside the threaded cylinder 26. When the threaded rod 25 extends, it can drive the lower pressure plate 23 to rise and fall, which in turn can drive the control of the splitting cutter 20 to rise and fall, so as to ensure the normal splitting test of the asphalt specimen. The two opposite threads of the bidirectional screw 30 are connected to the two moving plates 43 by threads. When the bidirectional screw 30 rotates, it can drive the two moving plates 43 to move relative to each other or in opposite directions. The lead screw 30 is rotatably connected to the inner seat 13. Therefore, when the bidirectional lead screw 30 rotates inside the inner seat 13, the position of the inner seat 13 remains unchanged. Furthermore, when the bidirectional lead screw 30 rotates, the relative movement of the moving plate 43 causes the two arc-shaped plates 32 to move synchronously relative to each other. Thus, when the asphalt specimen is placed on the placement tray 27, the relative movement of the arc-shaped plates 32, and the fact that the distance from the center of the placement tray 27 to the same point on both arc-shaped plates 32, ensures that the asphalt specimen is positioned on the placement tray 27 when the two arc-shaped plates 32 contact both sides of the asphalt specimen. At the center, the center of the asphalt specimen can be aligned with the splitting tool 20, facilitating subsequent splitting tests. Simultaneously, when the worm 38 rotates, it drives the threaded cylinder 26 to rotate, which in turn drives the threaded rod 25 to extend, thereby causing the splitting tool 20 to move downwards to test the splitting strength of the asphalt specimen. At the same time, when the worm 38 rotates, it drives the worm wheel 39 to rotate. The worm wheel 39 drives one of the sprockets 42 to rotate via the connecting rod 41. The sprocket 42 drives the other sprocket 42 to rotate via the chain 35, which in turn drives the bidirectional screw 30 to rotate. The movable plate 43 can be moved synchronously, and the smoothness of the arc plate 32 during movement can be ensured by the speed reduction transmission of the worm gear 39 and the worm 38. After the cracking tool tests the asphalt specimen and obtains the test data, the splitting tool 20 can be moved down continuously, and the arc plate 32 can be continuously squeezed on the asphalt specimen. At this time, the movement distance of the arc plate 32 can be reserved by the extension and retraction of the second telescopic rod 34. When the splitting tool 20 continues to press down, the asphalt specimen, which is divided into two halves, is continuously squeezed by the arc plate 32. At the same time, the compressive strength of the asphalt specimen can be measured by the deformation of the third spring 36. It is worth noting that when this equipment performs splitting strength testing on asphalt specimens, the arc plate 32 will initially contact the asphalt specimen. When the splitting blade 20 is continuously moved downward to test the ultimate strength of the asphalt specimen, the second telescopic rod 34 can be retracted through the linkage of the moving plate 43. The retraction distance of the second telescopic rod 34 is the reserved distance for the downward compression of the asphalt specimen in the splitting performance test. After the splitting performance test of the asphalt specimen is completed, the continuous downward movement of the splitting blade 20 will cause the splitting blade 20 to cut into the interior of the asphalt specimen, splitting the asphalt specimen into two halves. At this time, when the arc plate 32 is continuously moved, the compressive strength of the two halves of the asphalt specimen can be tested. Thus, the splitting strength of the asphalt specimen can be tested at the same time as its compressive strength.
[0035] Please see the appendix Figure 1 Appendix Figure 5 Appendix Figure 6 and attached Figure 8 A mounting frame 7 is fixedly installed on the top surface of the machine body 1. A drive housing 8 is installed on the top of the mounting frame 7. A second motor 40 is provided inside the drive housing 8, and the output end of the second motor 40 is connected to the worm gear 38. Rollers 33 are rotatably installed inside the two arc plates 32.
[0036] Specifically, the second motor 40 can be turned on to drive the worm 38 to rotate, and the worm wheel 39 is installed inside the mounting frame 7 via a rotating shaft, thereby ensuring the stability of the rotation of the worm 38. By setting rollers 33 inside the arc plate 32, when the arc plate 32 contacts the asphalt specimen, the rolling of the rollers 33 can easily squeeze the asphalt specimen to the center of the two arc plates 32, thereby making it easy to position the asphalt specimen at the center of the placement plate 27, aligned with the splitting tool 20.
[0037] Please see the appendix Figure 5 Appendix Figure 6 and attached Figure 7 A second guide rod 24 is symmetrically installed on the top surface of the lower pressure plate 23, and the top end of the second guide rod 24 is fixedly installed on the inner side of the mounting frame 7. A first guide rod 22 is symmetrically installed on the bottom surface of the lower pressure plate 23, and the bottom end of the first guide rod 22 is connected to the splitting blade 20. A smooth rod 31 is inserted between the two moving plates 43. Uprights 3 are fixedly installed at the four corners of the bottom surface of the machine body 1. A base plate 2 is fixedly installed between the uprights 3. A water tank 4 is provided on the top of the base plate 2. A water pump 6 is connected to the top surface of the water tank 4. One end of the water pump 6 is connected to a water pump 5, and the water pump 5 is installed on the top surface of the machine body 1. A vacuum pump 12 is installed on the top surface of the machine body 1. A sealing door 9 is installed on one side of the machine body 1 through a hinge. A control panel 10 is provided on one side of the machine body 1. A drain pipe 11 is connected to the bottom surface of the machine body 1.
[0038] Specifically, the second guide rod 24 and the first guide rod 22 are telescopic. Therefore, when the threaded rod 25 extends and pushes the lower pressure plate 23 downward, the second guide rod 24 can also extend, thereby increasing the stability and directionality of the lower pressure plate 23 during lifting and lowering. At the same time, when the first telescopic rod 21 retracts or extends, the first guide rod 22 can also extend and retract, thereby increasing the stability of the fracture tool during use. The smooth rod 31 and the moving plate 43 are connected by a sliding connection. Therefore, when the bidirectional screw 30 rotates and drives the moving plate 43 to move, the moving plate 43 can slide on the smooth rod 31, thereby increasing the stability and directionality of the moving plate 43 during movement. By turning on the water pump 5, the water pump 5 can draw water from the water tank 4 into the machine body 1. The water tank 4 is also equipped with an electric heating wire, which can heat the water inside the water tank 4 to simulate the water bath environment of the asphalt specimen. The vacuum pump 12... The internal environment of the machine body 1 can simulate a vacuum, thereby enhancing the testing effect on asphalt specimens. The surface of the sealing door 9 of this equipment is equipped with a sealing gasket. When the sealing door 9 is closed, the sealing gasket adheres to the surface of the machine body 1, thus ensuring the airtightness of the internal environment of the machine body 1. Furthermore, the sealing technology of the sealing door 9 on the market is relatively mature, so the specific structure and principle of the sealing door 9 will not be elaborated on here. The water bath inside the machine body 1 can be drained through the drain pipe 11, and a valve is provided at the port of the drain pipe 11 to control the opening and closing of the drain pipe 11. The control panel can view the pressure inside the machine body 1 and can intuitively view the test data and control the electrical hardware of this equipment. The control panel 10 uses PLC programming technology to control various components, and the PLC programming technology used in this equipment is a commonly used technique, so its specific structure and principle will not be elaborated on here.
[0039] Example 5:
[0040] After a water bath, the surface of the asphalt specimen will be wetted with water. The attached water will have a lubricating effect, affecting the stress state of the asphalt specimen. This embodiment solves this problem through the following solution. Please see the appendix Figure 3 The auxiliary mechanism includes a fan blade 15, a second rotating rod 18, and an air guide plate 19. The second rotating rod 18 is rotatably mounted on the bottom of the body 1. The fan blade 15 is fixedly mounted on the outer surface of the second rotating rod 18. The air guide plate 19 is symmetrically mounted on the top surface of the inner seat 13 via hinges.
[0041] Specifically, after the asphalt specimen is water-bathed, the vibration of the second rotating rod 18 can drive the fan blades 15 to rotate. The rotating fan blades 15 can blow air upwards, and the airflow flows upwards through the first opening 28 and the second opening 29. Guided by the air guide plate 19, the airflow can come into contact with the asphalt specimen placed on the placement tray 27, thereby drying the asphalt specimen. This two-stage drying process replaces the traditional wiping action, and the non-contact drying can prevent damage to the asphalt specimen due to contact.
[0042] Example 6:
[0043] During the water bath process, the varying distances between the water and the heating element may cause a temperature gradient, resulting in uneven water temperature and affecting the testing results of the asphalt specimens. This embodiment provides an alternative structure to solve the above problem. Please see the appendix Figure 4 The auxiliary mechanism can also be a first rotating rod 16 and a stirring rod 17. The first rotating rod 16 is rotatably mounted on the bottom of the machine body 1, and the stirring rod 17 is fixedly mounted on the outer surface of the first rotating rod 16.
[0044] During the water bath process, the rotation of the first rotating rod 16 can drive the stirring rod 17 to rotate, and the stirring rod 17 stirs the water in the water bath, thereby ensuring the uniformity of the water temperature in the water bath and increasing the accuracy of subsequent experiments.
[0045] Please see the appendix Figure 3 and attached Figure 4 The bottom surface of the machine body 1 is fixedly mounted with a first motor 14 by a fixing frame, and the output end of the first motor 14 is connected to the first rotating rod 16 or the second rotating rod 18.
[0046] Specifically, by turning on the first motor 14, the first rotating rod 16 or the second rotating rod 18 can be driven to rotate.
[0047] This embodiment provides a device for testing the freeze-thaw cycle performance of modified asphalt in high-altitude permafrost areas. In use, the machine body 1 can be placed in a designated position, the sealing door 9 can be opened and the asphalt specimen can be placed inside the placement tray 27. The sealing door 9 can be closed and the cooling device inside the machine body 1 can be turned on, thereby simulating a low-temperature environment inside the machine body 1 to test the freeze-thaw cycle performance of the asphalt specimen. By turning on the water pump 5, the heated water bath water inside the water tank 4 can be drawn into the machine body 1, thereby water bathing the asphalt specimen. The water bath water can be discharged through the drain pipe 11. When testing the splitting strength of asphalt specimens, the second motor 40 can be activated. The second motor 40 drives the worm gear 38 to rotate, which in turn drives the worm wheel 39 to rotate. The worm wheel 39 drives the threaded cylinder 26 to rotate, which in turn drives the threaded rod 25 to extend. The threaded rod 25 pushes the lower pressure plate 23 downward. The lower pressure plate 23 drives the splitting cutter 20 downward via the first telescopic rod 21. Simultaneously, the worm gear 38 drives the worm wheel 39 to rotate, which in turn drives the sprocket 42 and chain 35 to rotate via the connecting rod 41. The sprocket 42 and chain 35 drive the bidirectional lead screw 30 to rotate, which in turn drives the moving plate 43 to move. The moving plate 43 moves via the second telescopic rod 21. Rod 34 drives the arc plate 32 to move relative to each other. The arc plate 32 can position the asphalt specimen. When the splitting tool 20 comes into contact with the dynamic contact of the asphalt specimen, the splitting tool 20 continues to move downward. At this time, the first telescopic rod 21 retracts and squeezes the first spring 2102. The first pressure sensor 2101 detects the deformation elastic force of the first spring 2102, so as to detect the splitting strength of the asphalt specimen. At the same time, the two arc plates 32 continue to move relative to each other. The arc plates 32 can squeeze the asphalt specimen inward. The arc plates 32 squeeze the third spring 36 inward. The second pressure sensor 37 detects the elastic force of the third spring 36, so as to detect the compressive strength of the asphalt specimen. Furthermore, during the water bath, the first motor 14 can be turned on, which drives the stirring rod 17 to rotate. The stirring rod 17 stirs the water in the water bath to increase the uniformity of the water temperature and ensure the accuracy of subsequent asphalt specimen testing. After the water bath, the second rotating rod 18 can be driven to rotate by the first motor 14. The second rotating rod 18 can drive the fan blades 15 to rotate. The fan blades 15 blow air upwards, and the airflow is guided by the air guide plate 19 to contact the surface of the asphalt specimen, thereby drying the water stains on the surface of the asphalt specimen, which is convenient for subsequent testing.
[0048] 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 device for testing the freeze-thaw cycle resistance of modified asphalt surface layers in high-altitude permafrost regions, comprising a body (1), characterized in that: The machine body (1) is equipped with a refrigeration device inside. An inner seat (13) is fixedly installed on the inner side of the machine body (1) by a rod. A placement plate (27) is provided at the center of the inner side of the inner seat (13). A first opening (28) and a second opening (29) are respectively opened through the bottom surface of the inner seat (13) and the bottom surface of the placement plate (27). An arc plate (32) is symmetrically provided on the inner side of the inner seat (13). A moving plate (43) is connected to one side of the arc plate (32) by a second telescopic rod (34). A pressure testing component is installed on one side of the moving plate (43). A lower pressure plate (23) is provided on the inner side of the machine body (1). A splitting knife (20) is connected to the bottom surface of the lower pressure plate (23) by a first telescopic rod (21). A strength testing component is provided inside the first telescopic rod (21). A linkage component is connected to the top surface of the lower pressure plate (23). An auxiliary mechanism is provided at the bottom of the inner side of the machine body (1).
2. The device for testing the freeze-thaw cycle resistance of modified asphalt surface layer in high-altitude permafrost regions according to claim 1, characterized in that: The pressure resistance detection component includes a second pressure sensor (37) and a third spring (36). The second pressure sensor (37) is fixedly installed on one side of the movable plate (43). The third spring (36) is disposed between the arc plate (32) and the movable plate (43), and the two ends of the third spring (36) are respectively connected to the second pressure sensor (37) and the arc plate (32).
3. The device for testing the freeze-thaw cycle resistance of modified asphalt surface layer in high-altitude permafrost regions according to claim 1, characterized in that: The second telescopic rod (34) is equipped with a second spring (3401).
4. The device for testing the freeze-thaw cycle resistance of modified asphalt surface layer in high-altitude permafrost regions according to claim 1, characterized in that: The strength detection component includes a first pressure sensor (2101) and a first spring (2102). The first pressure sensor (2101) is installed on the inner end of the first telescopic rod (21), and the first spring (2102) is disposed inside the first telescopic rod (21), with one end of the first spring (2102) connected to the first pressure sensor (2101).
5. The device for testing the freeze-thaw cycle resistance of modified asphalt surface layer in high-altitude permafrost regions according to claim 1, characterized in that: The linkage assembly includes a threaded rod (25), a threaded cylinder (26), a worm (38), a worm wheel (39), a connecting rod (41), a sprocket (42), a chain (35), and a bidirectional lead screw (30). The bidirectional lead screw (30) passes through two moving plates (43). The threaded rod (25) is fixedly installed on the top surface of the lower pressure plate (23). The threaded cylinder (26) is sleeved on the outside of the threaded rod (25). The worm (38) is fixedly sleeved on the outside of the threaded cylinder (26). The worm wheel (39) is located on one side of the worm (38) and is meshed with the worm (38). The connecting rod (41) is fixedly installed on one side of the worm wheel (39). The two sprockets (42) are respectively fixedly installed on one end of the bidirectional lead screw (30) and the connecting rod (41). The chain (35) is meshed between the two sprockets (42).
6. The device for testing the freeze-thaw cycle resistance of modified asphalt surface layer in high-altitude permafrost regions according to claim 5, characterized in that: The top surface of the body (1) is fixedly mounted with a mounting frame (7), and the top of the mounting frame (7) is mounted with a drive housing (8). The drive housing (8) is equipped with a second motor (40), and the output end of the second motor (40) is connected to the worm gear (38). Rollers (33) are rotatably mounted inside the two arc plates (32).
7. The device for testing the freeze-thaw cycle resistance of modified asphalt surface layer in high-altitude permafrost regions according to claim 6, characterized in that: The top surface of the lower pressure plate (23) is symmetrically equipped with a second guide rod (24), and the top end of the second guide rod (24) is fixedly installed on the inner side of the mounting frame (7). The bottom surface of the lower pressure plate (23) is symmetrically equipped with a first guide rod (22), and the bottom end of the first guide rod (22) is connected to the splitting blade (20). A smooth rod (31) is inserted between the two moving plates (43). Uprights (3) are fixedly installed at the four corners of the bottom surface of the machine body (1), and a base plate is fixedly installed between the uprights (3). (2) A water tank (4) is provided on the top of the base plate (2). A water pump (6) is connected to the top surface of the water tank (4). A water pump (5) is connected to one end of the water pump (6). The water pump (5) is installed on the top surface of the body (1). A vacuum pump (12) is installed on the top surface of the body (1). A sealing door (9) is installed on one side of the body (1) through a hinge. A control panel (10) is provided on one side of the body (1). A drain pipe (11) is connected to the bottom surface of the body (1).
8. The device for testing the freeze-thaw cycle resistance of modified asphalt surface layer in high-altitude permafrost regions according to claim 1, characterized in that: The auxiliary mechanism includes a fan blade (15), a second rotating rod (18), and a guide plate (19). The second rotating rod (18) is rotatably mounted on the bottom of the body (1). The fan blade (15) is fixedly mounted on the outer surface of the second rotating rod (18). The guide plate (19) is symmetrically mounted on the top surface of the inner seat (13) via hinges.
9. The device for testing the freeze-thaw cycle resistance of modified asphalt for surface courses in high-altitude permafrost regions according to claim 1, characterized in that: The auxiliary mechanism may also be a first rotating rod (16) and a stirring rod (17). The first rotating rod (16) is rotatably mounted on the bottom of the machine body (1), and the stirring rod (17) is fixedly mounted on the outer surface of the first rotating rod (16).
10. A device for testing the freeze-thaw cycle resistance of modified asphalt for surface courses in high-altitude permafrost regions according to any one of claims 8-9, characterized in that: The bottom surface of the machine body (1) is fixedly mounted with a first motor (14) by a fixing frame, and the output end of the first motor (14) is connected to the first rotating rod (16) or the second rotating rod (18).