A device for testing compression performance of a recycled polyester fiber roadbed reinforcing material monitored by a sensor and a testing method thereof

Abstract

The application relates to the technical field of compression performance testing, in particular to a regenerated polyester fiber roadbed reinforcing material compression performance testing device and method thereof through sensor monitoring, which comprises a supporting plate, a support fixed on the supporting plate, and a top plate arranged at the top of the support; a pressure tank fixed on the supporting plate is used for bearing water, a rubber pipe is arranged in the pressure tank, and pressure regulating pipes are symmetrically arranged on the side wall of the pressure tank; a pressure regulating mechanism is arranged in the pressure regulating pipe, a piston disc in sliding sealing connection with the pressure regulating pipe is connected to the pressure regulating mechanism, a follow-up balance mechanism is arranged on the pressure regulating mechanism, when a sample arranged in the rubber pipe is compressed and the side edge of the sample is deformed, water enters the pressure regulating pipe and pushes the piston disc, under the action of the pressure regulating mechanism and the follow-up balance mechanism, the support force borne by the piston disc can be kept within a certain range at all times, so that the accuracy of the compression performance test is ensured.

Description

Technical Field

[0001] This invention relates to the field of compression performance testing technology, specifically to a device and method for testing the compression performance of recycled polyester fiber roadbed reinforcement materials monitored by sensors. Background Technology

[0002] Recycled polyester fiber is an environmentally friendly and efficient geosynthetic material used in roadbed reinforcement. It primarily disperses loads and inhibits crack development through reinforcement, isolation, filtration, and drainage. Therefore, compression performance testing is a crucial step in evaluating its comprehensive mechanical behavior and its ability to work collaboratively with the soil.

[0003] For the compression performance test of recycled polyester fibers used for roadbed reinforcement, the core is to prepare fiber-soil composite samples according to requirements, and then apply a certain pressure to them after preparation to test their compression performance.

[0004] During compression testing, the prepared sample is placed on a pressure gauge, and a gradually increasing downward pressure is applied to the top of the sample until a clear failure surface appears or the axial strain reaches the set value. However, recycled polyester fiber reinforced roadbed materials are typically flexible, three-dimensional discrete reinforcing materials. Their mechanical properties and interaction with the soil are crucial to their reinforcing effect. Applying axial compressive force directly without any lateral constraints cannot simulate the stress state under real-world conditions, easily leading to stress concentration and premature sample failure.

[0005] To address this, a triaxial compression test can be used to test the compressibility of the sample. During a triaxial compression test, a certain confining pressure is provided to the sample, ensuring uniform lateral support. However, when the sample expands laterally due to axial compression, in actual roadbeds, this expansion is subject to passive resistance from the surrounding soil, and this resistance changes accordingly with the deformation of the sample. The confining pressure provided by the triaxial compression test remains constant, i.e., it is a rigid boundary constraint, which inevitably leads to errors in the test results. Summary of the Invention

[0006] The purpose of this invention is to provide a device and method for testing the compressive performance of recycled polyester fiber roadbed reinforcement materials monitored by sensors, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A sensor-based testing device for the compressive performance of recycled polyester fiber roadbed reinforcement materials includes:

[0009] Support plate, and brackets fixed on the support plate, with a top plate on the top of the brackets;

[0010] Also includes:

[0011] A pressure tank, fixed on a support plate, is used to carry water. A rubber tube is installed inside the pressure tank, and pressure regulating pipes are symmetrically arranged on the side wall of the pressure tank.

[0012] A pressure regulating mechanism is disposed inside the pressure regulating pipe. A piston disc is connected to the pressure regulating mechanism and is slidably and sealingly connected to the pressure regulating pipe. A follow-up balancing mechanism is provided on the pressure regulating mechanism. The follow-up balancing mechanism can adjust the supporting force on the piston disc through the pressure regulating mechanism when the water pressure on the piston disc changes.

[0013] As a further aspect of the present invention: the side wall of the pressure tank is formed with a through hole that communicates with the pressure regulating pipe.

[0014] As a further embodiment of the present invention: the pressure regulating mechanism includes guide columns fixed inside the pressure regulating pipe and arranged symmetrically, a movable plate sliding axially on the guide column, and a second cylinder provided at the end of the pressure regulating pipe, the telescopic end of the second cylinder passing through the pressure regulating pipe and fixedly connected to the movable plate.

[0015] As a further embodiment of the present invention: the pressure regulating mechanism further includes a support sleeve fixed on the movable plate, a support rod axially sliding inside the support sleeve, the support rod being fixedly connected to the piston disc, a second helical groove being formed on the outer circumference of the support rod, and a limiting block being provided on the inner wall of the support sleeve that slides and engages with the second helical groove.

[0016] As a further embodiment of the present invention: the follow-up balancing mechanism includes a rotating sleeve rotatably mounted on the movable plate, and a guide groove is formed on the outer circumferential wall of the rotating sleeve;

[0017] It also includes a sliding component and an elastic component disposed on the support sleeve and connected to the guide groove, for adjusting the supporting force provided to the piston disc.

[0018] As a further embodiment of the present invention: the sliding assembly includes a limiting rod fixed to the outer circumferential wall of the support sleeve, the support sleeve has a limiting ring that is fitted with the limiting rod in the axial direction, and the limiting ring is provided with a limiting post that is fitted with the guide groove.

[0019] As a further embodiment of the present invention: the elastic component includes a guide block fixed on the rotating sleeve, a rotating plate is provided on the support rod, a support column passing through the guide block is provided on the rotating plate, and a spring is sleeved on the support sleeve and the support rod, with the two ends of the spring abutting against the rotating plate and the limiting ring respectively.

[0020] As a further embodiment of the present invention: a compression assembly is provided on the top plate, the compression assembly includes a first cylinder fixed on the top plate, a push plate is provided at the telescopic end of the first cylinder, and a pressure plate is provided on the push plate.

[0021] As a further embodiment of the present invention: the guide groove includes an annular groove and a first spiral groove, and one end of the annular groove and the first spiral groove are connected to each other.

[0022] A method for testing the compressive properties of recycled polyester fiber roadbed reinforcement materials monitored by sensors includes the following steps:

[0023] Step 1: Place the prepared sample inside the rubber tube and fill the pressure vessel with water;

[0024] Step 2: When the water pressure inside the pressure tank reaches a certain value, the compression component applies downward pressure to the sample.

[0025] Step 3: When the sample is compressed and undergoes lateral deformation, water in the pressure tank is controlled to enter the pressure regulating pipe and push the piston disc to move;

[0026] Step 4: The piston disc will drive the pressure regulating mechanism and the follow-up balancing mechanism to move, and adaptively adjust the support force on the piston disc according to the piston disc's stroke.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] This invention automatically controls the piston disc to reposition itself based on the drainage volume in the pressure vessel when a sample undergoes lateral deformation under downward pressure. As the piston disc repositions, the rotation of the support rod drives the entire follow-up balancing mechanism, thereby automatically adjusting the support force on the piston disc. This ensures that the support force on the piston disc remains within a certain range, guaranteeing that the confining pressure applied to the sample remains stable. This effectively avoids the problem of excessive confining pressure due to sample deformation affecting the accuracy of compression performance testing, and is particularly suitable for simulating the stress state of materials under actual working conditions.

[0029] Using water as a pressure transmission medium can uniformly and isotropically transmit pressure to the rubber tube and sample surface, eliminating local stress concentration in the soil sample during testing. This restores the confining pressure environment experienced by underground soil or saturated materials under natural conditions. Furthermore, the confining pressure provided by water naturally simulates the saturated environment and hydrostatic pressure state of underground soil. Therefore, during sample compression performance testing, only the change in the amount of water entering the pressure regulating tube needs to be observed to infer the change in the sample's own volume. This allows for continuous and high-precision monitoring of the shearing or dilatation behavior of the sample during shearing when it is subjected to continuous downward pressure.

[0030] By moving the movable plate through the second cylinder, the initial compression of the spring can be changed, thus allowing for easy and continuous adjustment of the initial confining pressure without the need for repeated water injection or drainage. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of one embodiment of a device for testing the compressive performance of recycled polyester fiber roadbed reinforcement materials monitored by sensors.

[0032] Figure 2 This is a schematic diagram of the structure from another angle in one embodiment of a device for testing the compressive performance of recycled polyester fiber roadbed reinforcement materials monitored by sensors.

[0033] Figure 3 This is a schematic diagram of the structure of the rubber tube, pressure regulating tube, and pressure tank in one embodiment of a sensor-monitored testing device for the compression performance of recycled polyester fiber roadbed reinforcement materials.

[0034] Figure 4 This is a schematic cross-sectional view of the pressure regulating pipe and pressure tank in one embodiment of a sensor-monitored testing device for the compressibility of recycled polyester fiber roadbed reinforcement materials.

[0035] Figure 5 for Figure 4 A magnified schematic diagram of the structure at point A in the middle.

[0036] Figure 6 This is a schematic diagram of the compression component in one embodiment of a sensor-monitored testing device for the compression performance of recycled polyester fiber roadbed reinforcement materials.

[0037] Figure 7 This is a schematic diagram of the internal structure of the pressure regulating pipe in one embodiment of a sensor-monitored testing device for the compressibility of recycled polyester fiber roadbed reinforcement materials.

[0038] Figure 8 This is a schematic diagram of part of the pressure regulating mechanism and part of the follow-up balancing mechanism in one embodiment of a sensor-monitored compressive performance testing device for recycled polyester fiber roadbed reinforcement materials.

[0039] Figure 9 This is a schematic diagram of the structure of a portion of the pressure regulating mechanism and piston disc in one embodiment of a sensor-monitored testing device for the compressibility of recycled polyester fiber roadbed reinforcement materials.

[0040] Figure 10 This is an exploded structural diagram of part of the pressure regulating mechanism and part of the follow-up balancing mechanism in one embodiment of a sensor-monitored compressive performance testing device for recycled polyester fiber roadbed reinforcement materials.

[0041] In the diagram: 1. Support plate; 2. Bracket; 3. Top plate; 4. First cylinder; 5. Push plate; 6. Pressure plate; 7. Pressure tank; 701. Through hole; 8. Rubber hose; 9. Pressure regulating pipe; 10. Guide column; 11. Second cylinder; 12. Movable plate; 13. Rotating sleeve; 1301. Annular groove; 1302. First spiral groove; 1303. Guide block; 14. Support sleeve; 1401. Limiting block; 1402. Limiting rod; 15. Support rod; 1501. Second spiral groove; 16. Piston disc; 17. Limiting ring; 18. Limiting column; 19. Spring; 20. Rotating plate; 21. Support column. Detailed Implementation

[0042] 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, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] Furthermore, elements in this invention are referred to as being "fixed to" or "set on" another element, which may be directly on the other element or may also include an intervening element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or may also include an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0044] Please see Figures 1-10 In this embodiment of the invention, a device for testing the compressive performance of recycled polyester fiber roadbed reinforcement materials monitored by sensors includes:

[0045] Support plate 1, and bracket 2 fixed on support plate 1, with top plate 3 provided on top of bracket 2;

[0046] Also includes:

[0047] Pressure tank 7 is fixed on support plate 1 for carrying water. Rubber tube 8 is installed inside pressure tank 7, and pressure regulating pipes 9 are symmetrically arranged on the side wall of pressure tank 7.

[0048] A pressure regulating mechanism is provided inside the pressure regulating pipe 9. A piston disc 16 is connected to the pressure regulating mechanism and is slidably and sealingly connected to the pressure regulating pipe 9. A follow-up balancing mechanism is provided on the pressure regulating mechanism. The follow-up balancing mechanism can adjust the supporting force on the piston disc 16 through the pressure regulating mechanism when the water pressure on the piston disc 16 changes.

[0049] The pressure tank 7 has a through hole 701 on its side wall that communicates with the pressure regulating pipe 9.

[0050] Specifically, when testing the compressibility of the material, a cylindrical sample adapted to the rubber tube 8 can be prepared and placed inside the rubber tube 8. To test the compression state of the sample during actual use, it is necessary to simulate the surrounding pressure experienced by the sample under natural conditions, and then simulate the increase in vertical stress caused by the increase in upper load. Therefore, when the sample is fully inside the rubber tube 8, the upper and lower sides of the rubber tube 8 can be fixed to the pressure tank 7, and the pressure tank 7 and the rubber tube 8 can be sealed together using a sealing element. At this time, the pressure tank 7 is in a sealed state, and water can be poured into the pressure tank 7. The water will enter the pressure regulating pipe 9 through the through hole 701. When the pressure tank 7 is full of water, the water pressure will act on the piston disc 16. Under the action of the pressure regulating mechanism and the follow-up balancing mechanism, the supporting force provided to the piston disc 16 is canceled out by the water pressure. The piston disc 16 stops moving. Since water is essentially incompressible, the pressure generated by the water in the pressure tank 7 will be evenly and seamlessly transmitted to the rubber tube 8, confining the sample. At this time, a certain downward pressure can be provided to the sample, causing it to be compressed. Since the sample is rigidly supported on both the top and bottom sides, the sample will deform laterally, corresponding to the deformation of the rubber tube 8, which will squeeze the water in the pressure tank 7. After being squeezed, the water will continue to enter the pressure regulating tube 9, increasing the thrust on the piston disc 16. The piston disc 16 will drive the pressure regulating mechanism and the follow-up balancing mechanism to move. Under the action of the follow-up balancing mechanism, the pressure regulating mechanism controls the support force on the piston disc 16 to always remain within a certain range, so as to prevent the confining pressure provided to the sample from being too large due to sample deformation, which would lead to inaccurate compression test results.

[0051] Please see Figures 3-5 , Figures 7-10 The pressure regulating mechanism includes guide columns 10 fixed inside the pressure regulating pipe 9 and symmetrically arranged. A movable plate 12 slides axially on the guide column 10. A second cylinder 11 is provided at the end of the pressure regulating pipe 9. The telescopic end of the second cylinder 11 passes through the pressure regulating pipe 9 and is fixedly connected to the movable plate 12. The pressure regulating mechanism also includes a support sleeve 14 fixed on the movable plate 12. A support rod 15 slides axially inside the support sleeve 14. The support rod 15 is fixedly connected to the piston disc 16. A second spiral groove 1501 is formed on the outer circumference of the support rod 15. A limiting block 1401 is provided on the inner wall of the support sleeve 14 and slides into the second spiral groove 1501.

[0052] Please see Figures 3-5 , Figures 7-10The follow-up balancing mechanism includes a rotating sleeve 13 rotatably mounted on the movable plate 12, the outer circumferential wall of the rotating sleeve 13 having a guide groove; it also includes a sliding component and an elastic component disposed on the support sleeve 14 and connected to the guide groove, for adjusting the supporting force provided to the piston disc 16. The sliding component includes a limiting rod 1402 fixed to the outer circumferential wall of the support sleeve 14, and a limiting ring 17 axially sliding on the support sleeve 14 and engaging with the limiting rod 1402. The limiting ring 17 is provided with a limiting groove that engages with the guide groove. Position post 18, the elastic component includes a guide block 1303 fixed on the rotating sleeve 13, a rotating plate 20 is provided on the support rod 15, a support post 21 passing through the guide block 1303 is provided on the rotating plate 20, a spring 19 is sleeved on the support sleeve 14 and the support rod 15, the two ends of the spring 19 abut against the rotating plate 20 and the limiting ring 17 respectively, the guide groove includes an annular groove 1301 and a first spiral groove 1302, one end of the annular groove 1301 and the first spiral groove 1302 are connected to each other.

[0053] Please see Figure 7 In detail, the pitch of the second spiral groove 1501 is greater than the pitch of the first spiral groove 1302, and the angle formed by the second spiral groove 1501 in the circumferential direction is the same as the angle formed by the combination of the annular groove 1301 and the first spiral groove 1302.

[0054] A pressure sensor is installed on the rotating plate 20, which can detect the elastic thrust of the rotating plate 20, and thus detect the water pressure of the piston disc 16. A fixing ring is provided on the end of the support column 21 away from the rotating plate 20. The fixing ring abuts against the guide block 1303. When the pressure tank 7 is filled with water, the piston disc 16 is only subjected to the thrust provided by the follow-up balancing mechanism. In this case, in the initial state, the piston disc 16 is located at the end of the stroke away from the moving plate 12. Under the action of the support rod 15, the distance between the rotating plate 20 and the limiting ring 17 is maximized. The rotating plate 20 will control the fixing ring and the guide block 1303 to be in abutting state through the support column 21. At this time, the size of the mutual fitting between the support rod 15 and the support sleeve 14 is minimized, so that the limiting block 1401 is located at the end of the stroke of the second spiral groove 1501 away from the piston disc 16.

[0055] In this state, the limiting post 18 is located at the end of the stroke of the annular groove 1301 on the side away from the first spiral groove 1302, and the extension of the spring 19 in its natural state is greater than the maximum distance between the rotating plate 20 and the limiting ring 17. Therefore, the spring 19 always provides the rotating plate 20 with a thrust in the direction away from the movable plate 12. The rotating plate 20 will control the piston disc 16 through the support rod 15 to also tend to move away from the movable plate 12.

[0056] Under the action of the second cylinder 11, the position of the movable plate 12 will not change. When a compression test is required on the sample, water can be poured into the pressure tank 7. The water will flow through the through hole 701 into the pressure regulating pipe 9. When the pressure tank 7 is full of water, the water will also fill the chamber between the piston disc 16 and the pressure tank 7. At this time, water is continued to be poured into the pressure tank 7. Under the action of water pressure, the piston disc 16 moves towards the movable plate 12. The piston disc 16 will control the support rod 15 to move towards the support sleeve 14 and drive the rotating plate 20 to move. Since the limiting post 18 is located in the annular groove 130 Therefore, the position of the limiting ring 17 is locked, the rotating plate 20 will compress the spring 19 and control the movement of the support column 21, so that the fixed ring is separated from the guide block 1303. When the pressure sensor detects that the elastic thrust of the rotating plate 20 reaches the required value, it means that the water pressure on the piston disc 16 has reached the set value. At this time, the addition of water to the pressure tank 7 is stopped, so that the water pressure on the piston disc 16 remains unchanged. Since water is basically incompressible, under the action of water pressure, the outer circumference of the rubber tube 8 is also subjected to uniform water pressure, so as to provide the effect of confining pressure when testing the compression performance of the sample.

[0057] Please see Figure 4 At this point, the compression performance test of the sample can be performed. The top of the sample is subjected to gradually increasing downward pressure. Since the upper and lower sides of the sample are restricted, the sample will deform laterally under the action of downward pressure, thereby squeezing the water through the rubber tube 8. The deformation of the sample corresponds to the reduction of the effective cavity volume in the pressure tank 7. The water will be squeezed into the pressure regulating pipe 9, which increases the water thrust on the piston disc 16. Under the action of this thrust, the piston disc 16 is pushed to move towards the movable plate 12, causing the support rod 15 to move towards the support sleeve 14. The support rod 15 will drive the rotating plate 20 to move and compress the spring 19.

[0058] During this process, the support rod 15 will also drive the second spiral groove 1501 to move, and under the action of the limiting block 1401 and the second spiral groove 1501, the support rod 15 will rotate, thereby driving the rotating plate 20 to rotate. The rotating plate 20 will control the rotating sleeve 13 to rotate synchronously through the support column 21 and the guide block 1303. Under the action of the rotating sleeve 13, the annular groove 1301 and the first spiral groove 1302 will move. At this time, the limiting column 18 will move along the annular groove 1301 relative to the rotating sleeve 13.

[0059] If the sample has good compressibility, when the downward pressure provided to the sample reaches its maximum value, the lateral deformation of the sample itself will not be too large. Therefore, the movement stroke of the piston disc 16 is within a certain range, so that the limiting post 18 is still located in the annular groove 1301.

[0060] If the sample has poor compressibility, its lateral deformation gradually increases under downward pressure, causing the piston disc 16 to move continuously. Under the action of the limiting block 1401 and the second spiral groove 1501, the support rod 15 rotates continuously, causing the rotating sleeve 13 to rotate continuously. At this time, the limiting post 18 will move along the annular groove 1301 towards the first spiral groove 1302. When the limiting post 18 disengages from the annular groove 1301 and enters the first spiral groove 1302, the limiting post 18 is no longer rigidly locked by the annular groove 1301, and the spring 19 will provide support. The thrust of the positioning ring 17 toward the moving plate 12 causes the limiting post 18 to tend to slide along the first spiral groove 1302. The pitch of the first spiral groove 1302 is smaller than the pitch of the second spiral groove 1501. As a result, the rotating plate 20 and the limiting ring 17 will move synchronously toward the moving plate 12, and the movement speed of the rotating plate 20 is greater than the movement speed of the limiting ring 17, causing the spring 19 to continue to be compressed. During this process, since the force of the spring 19 is decomposed, the overall supporting force on the rotating plate 20 is reduced, that is, the elastic thrust measured by the pressure sensor is reduced.

[0061] As the elastic thrust on the rotating plate 20 decreases, the supporting force on the piston disc 16 remains within a certain range, thus ensuring that the overall confining pressure on the sample remains within a certain range. This avoids the problem that when the sample deforms, the supporting force on the piston disc 16 gradually increases due to the continuous compression of the spring 19, which in turn increases the confining pressure provided to the sample, making lateral deformation of the sample more difficult and affecting the accuracy of sample compression performance testing.

[0062] If it is necessary to adjust the initial confining pressure according to changes in sample composition, there is no need to add or release water in the pressure tank 7. Simply control the movable plate 12 to move towards or away from the pressure tank 7 via the second cylinder 11 to adjust the initial compression of the spring 19 and change the initial confining pressure on the sample.

[0063] Please see Figure 1 , Figure 2 , Figure 6 A compression assembly is provided on the top plate 3. The compression assembly includes a first cylinder 4 fixed on the top plate 3. A push plate 5 is provided on the telescopic end of the first cylinder 4. A pressure plate 6 is provided on the push plate 5.

[0064] Furthermore, before the sample is placed into the rubber tube 8, the first cylinder 4 controls the push plate 5 to be at the end of its stroke towards the top plate 3 to ensure that the push plate 5 does not interfere with the normal placement of the sample. When the cylindrical sample is placed into the rubber tube 8, the first cylinder 4 operates and pushes the push plate 5 towards the rubber tube 8 until the push plate 5 comes into contact with the top of the sample. At this time, the sample is deformed by downward pressure. Since the rubber tube 8 itself can deform to a certain extent, the rubber tube 8 will not hinder the deformation of the sample. Under the action of the first cylinder 4, the downward pressure of the push plate 5 on the sample is gradually increased until the downward pressure reaches its maximum.

[0065] Since water is essentially incompressible, and according to the properties of water, the pressure applied to a closed fluid can be transmitted from the fluid in all directions without changing magnitude. The water pressure acts uniformly on the rubber tube 8 that wraps the sample from all directions, thus applying a completely isotropic confining pressure to the sample. This uniformity ensures that the initial stress state at each point of the sample is completely consistent, eliminating local stress concentration or abnormal deformation caused by uneven pressure. This provides highly reliable initial boundary conditions for the experiment. Moreover, using water to provide confining pressure naturally simulates the saturated environment and hydrostatic pressure state of underground soil, making the experimental results closer to engineering practice.

[0066] In this regard, during the sample compression performance test, it is only necessary to observe the change in the amount of water entering the pressure regulating tube 9 to infer the change in the sample's own volume. Thus, when the sample is subjected to continuous downward pressure, the shearing or shearing expansion behavior of the sample during the shearing process can be continuously and with high precision monitored.

[0067] A method for testing the compressive properties of recycled polyester fiber roadbed reinforcement materials monitored by sensors includes the following steps:

[0068] Step 1: Place the prepared sample into the rubber tube 8 and fill the pressure tank 7 with water;

[0069] Step 2: When the water pressure inside pressure tank 7 reaches a certain value, the compression component provides downward pressure to the sample.

[0070] Step 3: When the sample is compressed and undergoes lateral deformation, the water in the pressure tank 7 is controlled to enter the pressure regulating pipe 9 and push the piston disc 16 to move.

[0071] Step 4: The piston disc 16 will drive the pressure regulating mechanism and the follow-up balancing mechanism to move, and adaptively adjust the support force on the piston disc 16 according to the stroke of the piston disc 16.

[0072] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0073] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A device for testing the compressive properties of recycled polyester fiber roadbed reinforcement materials monitored by sensors, comprising: Support plate, and brackets fixed on the support plate, with a top plate on the top of the brackets; Its characteristic is that it further includes: A pressure tank, fixed on a support plate, is used to carry water. A rubber tube is installed inside the pressure tank, and pressure regulating pipes are symmetrically arranged on the side wall of the pressure tank. A pressure regulating mechanism is provided inside the pressure regulating pipe. A piston disc is connected to the pressure regulating mechanism and is slidably and sealingly connected to the pressure regulating pipe. A follow-up balancing mechanism is provided on the pressure regulating mechanism. The follow-up balancing mechanism can adjust the supporting force on the piston disc through the pressure regulating mechanism when the water pressure on the piston disc changes. The pressure regulating mechanism includes guide columns fixed inside the pressure regulating pipe and arranged symmetrically, and a movable plate is slidably mounted on the guide column along its axis. The pressure regulating mechanism also includes a support sleeve fixed on the movable plate. A support rod slides axially inside the support sleeve. The support rod is fixedly connected to the piston disc. A second spiral groove is formed on the outer circumference of the support rod. A limiting block is provided on the inner wall of the support sleeve that slides and engages with the second spiral groove. The follow-up balancing mechanism includes a rotating sleeve rotatably mounted on the movable plate, and a guide groove is formed on the outer circumferential wall of the rotating sleeve; the guide groove includes an annular groove and a first spiral groove, and one end of the annular groove and the first spiral groove are connected to each other. It also includes a sliding component and an elastic component disposed on the support sleeve and connected to the guide groove, for adjusting the supporting force provided to the piston disc; The sliding assembly includes a limiting rod fixed to the outer circumferential wall of the support sleeve, and a limiting ring that is axially slidable on the support sleeve and engages with the limiting rod. The limiting ring is provided with a limiting post that engages with the guide groove. The elastic component includes a guide block fixed on the rotating sleeve, a rotating plate on the support rod, a support column passing through the guide block on the rotating plate, and a spring sleeved on the support sleeve and the support rod, with the two ends of the spring abutting against the rotating plate and the limiting ring, respectively.

2. The device for testing the compressive performance of recycled polyester fiber roadbed reinforcement material monitored by sensors according to claim 1, characterized in that, The pressure tank sidewall has a through hole that communicates with the pressure regulating pipe.

3. The device for testing the compressive performance of recycled polyester fiber roadbed reinforcement material monitored by sensors according to claim 1, characterized in that, A second cylinder is provided at the end of the pressure regulating pipe. The extension end of the second cylinder passes through the pressure regulating pipe and is fixedly connected to the movable plate.

4. The device for testing the compressive performance of recycled polyester fiber roadbed reinforcement material monitored by sensors according to claim 1, characterized in that, A compression assembly is provided on the top plate. The compression assembly includes a first cylinder fixed on the top plate. A push plate is provided at the telescopic end of the first cylinder, and a pressure plate is provided on the push plate.

5. A method for testing the compressive performance of recycled polyester fiber roadbed reinforcement materials monitored by sensors, comprising the sensor-monitored compressive performance testing device for recycled polyester fiber roadbed reinforcement materials as described in any one of claims 1-4, characterized in that, Includes the following steps: Step 1: Place the prepared sample inside the rubber tube and fill the pressure vessel with water; Step 2: When the water pressure inside the pressure tank reaches a certain value, the compression component applies downward pressure to the sample. Step 3: When the sample is compressed and undergoes lateral deformation, water in the pressure tank is controlled to enter the pressure regulating pipe and push the piston disc to move; Step 4: The piston disc will drive the pressure regulating mechanism and the follow-up balancing mechanism to move, and adaptively adjust the support force on the piston disc according to the piston disc's stroke.

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