Regenerated roadbed aggregate compression resistance detection device based on mechanical sensor sensing and detection method thereof

Abstract

This invention relates to the field of compressive strength testing technology, specifically to a device and method for testing the compressive strength of recycled roadbed aggregate based on mechanical sensor sensing. The device includes: a machine base, and a support platform mounted on the machine base, with a guide column on the support platform and a movable plate slidably mounted on the guide column along its axial direction; a support assembly mounted on the support platform for supporting the sample; a multi-directional centering mechanism mounted on the movable plate, with multiple circumferentially distributed limiting wheels connected to the multi-directional centering mechanism; a movable rod slidably mounted on the movable plate and connected to the multi-directional centering mechanism, with a stamping assembly mounted on the movable rod; and a rotation adjustment mechanism mounted on the movable plate and connected to the movable rod. The reciprocating motion of the movable plate in the vertical direction drives the movable rod to rotate via the rotation adjustment mechanism, thereby changing the detection position of the stamping assembly and ensuring the comprehensiveness of the test results.

Description

Technical Field

[0001] This invention relates to the field of compressive strength testing technology, specifically to a device and method for testing the compressive strength of recycled roadbed aggregate based on mechanical sensor sensing. Background Technology

[0002] Recycled roadbed aggregate refers to recycled materials with certain gradation and strength obtained by processing waste concrete, bricks and stones through crushing, screening and washing processes. It is widely used in the filling projects of roadbed, base course and subbase course.

[0003] Recycled aggregates are derived from waste concrete of varying strength grades, resulting in significant differences in their mechanical properties. Furthermore, the production process may introduce microcracks or weak interfaces, leading to lower compressive strength, elastic modulus, and other key indicators compared to natural aggregates. Therefore, before application in roadbed engineering, recycled aggregates must undergo rigorous compressive performance testing to ensure the load-bearing capacity and long-term stability of the roadbed structure.

[0004] In the existing technology, the compressive strength test of recycled aggregate specimens mainly refers to the test method of natural aggregates, that is, using a pressure testing machine to conduct an axial compression test on standard-sized cylindrical or cubic specimens, and recording the force value change during the loading process through a pressure sensor until the specimen is destroyed, thereby obtaining its compressive strength.

[0005] However, in actual engineering, different parts of recycled aggregate specimens may have differences in density and strength. Traditional pressure testing machines can only perform overall pressure testing and cannot independently apply pressure to specific points on the surface of the specimen. If multi-point testing is required, the specimen must be moved and re-aligned repeatedly. The movement of the specimen can easily lead to specimen displacement, which in turn can cause eccentric loads during the pressure process, resulting in uneven stress distribution inside the specimen and ultimately inaccurate test results. Summary of the Invention

[0006] The purpose of this invention is to provide a device and method for detecting the compressive strength of recycled roadbed aggregate based on mechanical sensor sensing, 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 device for detecting the compressive strength of recycled roadbed aggregate based on mechanical sensors includes:

[0009] The machine base, and the support platform set on the machine base, the support platform is equipped with guide columns, and the guide columns have movable plates that slide axially.

[0010] Also includes:

[0011] A support assembly is provided on the support platform to support the sample, and a pressure sensor is installed on the support assembly to detect the pressure state of the sample.

[0012] A multi-directional centering mechanism is provided on the movable plate. The multi-directional centering mechanism is connected to a plurality of limiting wheels that are equidistantly distributed in a circle. The multi-directional centering mechanism can center the sample through the limiting wheels.

[0013] A movable rod is slidably mounted on the movable plate and connected to the multi-directional centering mechanism; a stamping assembly is provided on the movable rod.

[0014] A rotary adjustment mechanism is disposed on the movable plate and connected to the movable rod. The rotary adjustment mechanism can adjust the stamping position of the stamping assembly through the movable rod.

[0015] As a further aspect of the present invention: the bearing assembly includes a lower pressure platform disposed on the bearing platform, and a lower pressure plate is disposed at the end of the lower pressure platform.

[0016] As a further embodiment of the present invention: the multi-directional centering mechanism includes a support sleeve disposed on the movable plate, the support sleeve being slidably connected to the movable rod, and an upper pressure plate being disposed at the end of the support sleeve;

[0017] It also includes a swing assembly and a limiting assembly disposed on the support sleeve and connected to the upper pressure plate.

[0018] As a further embodiment of the present invention: the oscillation assembly includes a plurality of hinged rods that are hinged to the support sleeve and are equidistantly distributed in a circle. The hinged rods are rotatably connected to the limiting wheel. The support sleeve has a movable ring that slides axially. A connecting rod that is hinged to the hinged rod is hinged to the movable ring. A first spring is sleeved on the support sleeve. The two ends of the first spring abut against the movable ring and the upper pressure plate, respectively.

[0019] As a further embodiment of the present invention: the limiting component includes a connecting plate slidably mounted on the support sleeve, and a cylinder is provided on the upper pressure plate, the telescopic end of the cylinder being connected to the connecting plate.

[0020] As a further embodiment of the present invention: the stamping assembly includes a slot formed on the upper pressure plate, the end of the movable rod is provided with a fitting plate that engages with the slot, and an eccentric pressure block is provided on the fitting plate.

[0021] As a further embodiment of the present invention: the rotary adjustment mechanism includes a fixed plate disposed at the end of the guide post, the movable rod abutting against the fixed plate, the movable plate being provided with a protruding post penetrating the fixed plate, and a receiving plate slidably mounted on the protruding post and rotatably connected to the movable rod;

[0022] It also includes a guide assembly and a one-way transmission assembly disposed on the receiving plate and connected to the movable rod.

[0023] As a further embodiment of the present invention: the guiding component includes a sliding plate slidably mounted on the receiving plate, the sliding plate having a vertical groove and an inclined groove, and the movable plate having a limiting post that slidably engages with the vertical groove and the inclined groove.

[0024] As a further embodiment of the present invention: the one-way transmission assembly includes a ratchet plate disposed on the sliding plate, a ratchet wheel that meshes with the ratchet plate is disposed on the movable rod, and a second spring is sleeved on the movable rod, with the two ends of the second spring abutting against the movable plate and the ratchet wheel respectively.

[0025] A method for detecting the compressive strength of recycled roadbed aggregate based on mechanical sensor sensing includes the following steps:

[0026] Step 1: Place the sample to be tested on the support assembly;

[0027] Step 2: Control the movable plate to slide along the guide column, and control the limit wheel to move towards the bearing component through the multi-directional centering mechanism;

[0028] Step 3: When the limiting wheel abuts against the side of the sample, the multi-directional centering mechanism controls the limiting wheel to move aside and guides the sample to the center position of the bearing component. Then, under the action of the stamping component, the sample is subjected to a compressive strength test.

[0029] Step 4: After the test at this position is completed, the movable plate is reset. Under the action of the rotation adjustment mechanism, the impact position of the stamping assembly is adjusted by the movable rod, and the above steps are repeated to complete the comprehensive test of the sample.

[0030] Compared with the prior art, the beneficial effects of the present invention are:

[0031] This invention enables the sample to be centered before testing. When the movable plate moves down, four circumferentially distributed limiting wheels first contact the side of the sample. The outward swing of the hinge rod generates a radial thrust on the sample, automatically pushing the sample to make a slight translation on the surface of the lower pressure plate until its central axis coincides with the central axis of the pressure plate. This ensures that the pressure on the sample is strictly transmitted axially throughout the entire testing process, providing a fundamental guarantee for the accuracy of the compressive strength data.

[0032] After the stamping assembly completes one test, the rotary adjustment mechanism, through the cooperation of the inclined groove and the limiting post, converts the lifting motion of the movable plate into the horizontal reciprocating motion of the sliding plate. Then, through the unidirectional transmission ratchet mechanism, it drives the movable rod and the eccentric pressure block to rotate intermittently. After each lifting cycle, the eccentric pressure block automatically rotates by a fixed angle to reach the next test point. In this way, local compressive strength tests can be performed on multiple different positions on the upper surface of the sample in sequence, thereby ensuring the comprehensiveness of the test.

[0033] The interlocking plate and the slot on the upper pressure plate adopt a cross-shaped interlocking structure, forming a rigid connection during the pressure application phase. This ensures that the eccentric pressure block will not deflect or shift during the pressure application process. Simultaneously, the rotation adjustment mechanism maintains the angle of the eccentric pressure block through a one-way slippage design during the downward movement of the movable plate, only driving its rotation to switch positions during the reset phase. This bidirectional locking design ensures that the pressure direction at each testing point is strictly along the specimen's axial direction, fundamentally avoiding localized stress concentration or testing errors caused by deviations in the pressure direction. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of an embodiment of a device for detecting the compressive strength of recycled roadbed aggregate based on mechanical sensor sensing.

[0035] Figure 2 This is a structural schematic diagram from another angle in an embodiment of the device for detecting the compressive strength of recycled roadbed aggregate based on mechanical sensor sensing.

[0036] Figure 3 This is a schematic diagram showing the connection relationship between the movable plate, part of the rotation adjustment mechanism, the guide column, and part of the multi-directional centering mechanism in an embodiment of a mechanical sensor-based device for detecting the compressive strength of recycled roadbed aggregate.

[0037] Figure 4 for Figure 3 A magnified schematic diagram of the structure at point A in the middle.

[0038] Figure 5 This is a schematic diagram of the structure of a multi-directional centering mechanism, a rotary adjustment mechanism, and a movable plate in an embodiment of a mechanical sensor-based device for detecting the compressive strength of recycled roadbed aggregate.

[0039] Figure 6 This is a schematic diagram of the structure of some multi-directional centering mechanism and some rotation adjustment mechanism in an embodiment of a mechanical sensor-based device for detecting the compressive strength of recycled roadbed aggregate.

[0040] Figure 7 This is a schematic diagram of the multi-directional centering mechanism, movable rod, and stamping assembly in an embodiment of a mechanical sensor-based device for detecting the compressive strength of recycled roadbed aggregate.

[0041] Figure 8 This is an exploded structural diagram of the multi-directional centering mechanism and stamping component in an embodiment of a mechanical sensor-based device for detecting the compressive strength of recycled roadbed aggregate.

[0042] Figure 9 This is a schematic diagram of the rotating adjustment mechanism in an embodiment of a mechanical sensor-based device for detecting the compressive strength of recycled roadbed aggregate.

[0043] Figure 10 This is an exploded structural diagram of the rotary adjustment mechanism in an embodiment of a mechanical sensor-based device for detecting the compressive strength of recycled roadbed aggregate.

[0044] In the diagram: 1. Machine base; 2. Support platform; 3. Guide column; 4. Lower pressure platform; 401. Lower pressure plate; 5. Movable plate; 6. Fixed plate; 7. Support sleeve; 8. Upper pressure plate; 801. Slot; 9. Movable rod; 10. Fitting plate; 11. Eccentric pressure block; 12. Hinge rod; 13. Limiting wheel; 14. Movable ring; 15. Connecting rod; 16. First spring; 17. Connecting plate; 18. Cylinder; 19. Protruding column; 20. Support plate; 21. Sliding plate; 2101. Vertical groove; 2102. Inclined groove; 22. Limiting column; 23. Racket plate; 24. Ratchet; 25. Second spring. Detailed Implementation

[0045] 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.

[0046] 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.

[0047] Please see Figures 1 to 10 In this embodiment of the invention, the device for detecting the compressive strength of recycled roadbed aggregate based on mechanical sensor sensing includes:

[0048] The machine base 1 and the support platform 2 set on the machine base 1, the support platform 2 is provided with guide column 3, and the guide column 3 has a movable plate 5 that slides axially.

[0049] Also includes:

[0050] A support assembly is mounted on the support platform 2 to support the sample. A pressure sensor is installed on the support assembly to detect the pressure state of the sample.

[0051] A multi-directional centering mechanism is provided on the movable plate 5. The multi-directional centering mechanism is connected to a plurality of limiting wheels 13 that are equidistantly distributed in a circle. The multi-directional centering mechanism can center the sample through the limiting wheels 13.

[0052] The movable rod 9 is slidably mounted on the movable plate 5 and connected to the multi-directional centering mechanism. A stamping assembly is provided on the movable rod 9.

[0053] A rotary adjustment mechanism is disposed on the movable plate 5 and connected to the movable rod 9. The rotary adjustment mechanism can adjust the stamping position of the stamping assembly through the movable rod 9.

[0054] Specifically, when conducting compressive strength tests on samples, to ensure comprehensive testing, it is necessary to control the test to be centered and apply pressure to different positions of the sample. This can be achieved by placing the sample on a support assembly, simultaneously controlling the movable plate 5 to move towards the support assembly, and driving the limiting wheel 13 to move synchronously via a multi-directional centering mechanism. When the limiting wheel 13 first contacts the side of the sample, the multi-directional centering mechanism causes the limiting wheel 13 to move aside and position the sample, ensuring that the force direction of the sample always points towards its axis. After positioning, the stamping assembly will stamp the sample. Subsequently, the movable plate 5 will be reset, and the rotating adjustment mechanism will move under the action of the movable rod 9, causing the movable rod 9 to rotate a certain angle. At this point, the stamping assembly will adjust to the next stamping position, repeating the above steps to achieve comprehensive multi-directional compressive strength testing of the sample.

[0055] The bearing assembly includes a pressure plate 4 disposed on the bearing platform 2, and a pressure plate 401 is disposed at the end of the pressure plate 4.

[0056] The multi-directional centering mechanism includes a support sleeve 7 mounted on the movable plate 5, the support sleeve 7 being slidably connected to the movable rod 9, and an upper pressure plate 8 being provided at the end of the support sleeve 7; it also includes a swinging component and a limiting component mounted on the support sleeve 7 and connected to the upper pressure plate 8, the swinging component including a plurality of hinged rods 12 hinged to the support sleeve 7 and equidistantly distributed in a circle, the hinged rods 12 being rotatably connected to the limiting wheel 13, a movable ring 14 slidably mounted on the support sleeve 7, a connecting rod 15 hinged to the movable ring 14 and hinged to the hinged rods 12, a first spring 16 mounted on the support sleeve 7, the two ends of the first spring 16 abutting against the movable ring 14 and the upper pressure plate 8 respectively, the limiting component including a connecting plate 17 slidably mounted on the support sleeve 7, a cylinder 18 being provided on the upper pressure plate 8, the telescopic end of the cylinder 18 being connected to the connecting plate 17.

[0057] In detail, a pressure sensor is installed on the lower pressure plate 4, which can detect the magnitude of the force when the sample is placed on the lower pressure plate 401 and subjected to force. The movable plate 5 can be driven by a hydraulic cylinder to move up and down along the guide column 3. The upper pressure plate 8 and the lower pressure plate 401 are in a coaxial state. In order to ensure that the sample is always subjected to axial pressure during the compressive strength test, it is necessary to ensure that the sample is located in the center of the lower pressure plate 401. Therefore, the sample needs to be centered before the test.

[0058] In the initial state, under the action of cylinder 18, the connecting plate 17 is located at the end of its stroke in the direction close to the movable plate 5. In this state, the movable ring 14 and the connecting plate 17 are in contact, that is, the distance between the movable ring 14 and the upper pressure plate 8 is the largest. The elongation of the first spring 16 in its natural state is greater than the maximum distance between the movable ring 14 and the upper pressure plate 8. Therefore, the first spring 16 is in a pre-compressed state and always provides the movable ring 14 with a thrust in the direction close to the connecting plate 17. The movable ring 14 will control the angle between the hinge rod 12 and the support sleeve 7 to be the smallest through the connecting rod 15, and the hinge rod 12 and the support sleeve 7 are in a parallel state. Therefore, the distance between the four limit wheels 13 is the smallest, and the ring size formed by the combination of the central axes of the four limit wheels 13 is slightly larger than the size of the sample.

[0059] When it is necessary to perform a compressive strength test on the sample, the movable plate 5 can be controlled by the hydraulic cylinder to slide along the axial direction of the guide column 3 and move towards the lower pressure plate 401, thereby driving the upper pressure plate 8 to move through the support sleeve 7. The support sleeve 7 will also drive the limit wheel 13 to move synchronously through the hinge rod 12.

[0060] As the movable plate 5 continues to move downward, the limiting wheel 13 first contacts the side of the sample. Since the ring size formed by the combination of the central axes of the four limiting wheels 13 is slightly larger than the sample size in the initial state, when the limiting wheel 13 contacts the side of the sample, the sample generates a reverse force on the limiting wheel 13. This force is transmitted to the connecting rod 15 through the hinge rod 12, forcing the hinge rod 12 to swing outward around its hinge point with the support sleeve 7, driving multiple hinge rods 12 to move in a direction away from each other. The opening movement of the hinge rod 12 applies a downward pulling force to the movable ring 14 through the connecting rod 15 with which it is hinged, causing the movable ring 14 to overcome the pre-compression force of the first spring 16 and slide along the axial direction of the support sleeve 7 toward the upper pressure plate 8, further compressing the first spring 16.

[0061] During the opening of the limiting wheels 13, if the initial position of the sample deviates from the center of the lower pressure plate 401, the contact points between the four limiting wheels 13 and the side of the sample will generate uneven thrust. The resultant force of this thrust will push the sample to make a slight translation on the surface of the lower pressure plate 401 until the central axis of the sample coincides with the central axis of the lower pressure plate 401. When the limiting wheels 13 are fully in contact with the side wall of the sample and all the hinge rods 12 reach a stable opening angle, the sample is precisely positioned to the center of the lower pressure plate 401. Through this automatic centering mechanism, it is ensured that the force direction of the sample always points to its axial direction, providing an accurate positioning basis for subsequent compressive strength testing.

[0062] After the sample is centered, cylinder 18 operates, and its telescopic end pushes connecting plate 17 toward the upper pressure plate 8. The movement of connecting plate 17 gradually brings it closer to and eventually abuts against movable ring 14. As connecting plate 17 continues to move, it applies a downward thrust to movable ring 14, pushing movable ring 14 to further compress the first spring 16. Through connecting rod 15, it drives hinge rod 12 to continue to swing outward, causing limiting wheel 13 to gradually separate from the side wall of the sample. When connecting plate 17 moves to the end of its stroke, limiting wheel 13 completely detaches from the sample surface, eliminating the lateral constraint or friction interference that limiting wheel 13 may cause to the sample during subsequent compression. In this way, by first centering and positioning and then giving way and applying pressure, the device ensures that the sample is accurately centered while effectively avoiding the influence of limiting wheel 13 on the test results. It ensures that the pressure on the sample during compression is strictly transmitted along its axial direction, thereby significantly improving the accuracy and reliability of the compression test data.

[0063] The stamping assembly includes a slot 801 formed on the upper pressure plate 8, and the end of the movable rod 9 is provided with a fitting plate 10 that fits into the slot 801. An eccentric pressure block 11 is provided on the fitting plate 10.

[0064] The rotary adjustment mechanism includes a fixed plate 6 disposed at the end of the guide post 3, the movable rod 9 abutting against the fixed plate 6, a protruding post 19 penetrating the fixed plate 6 disposed on the movable plate 5, and a receiving plate 20 slidably mounted on the protruding post 19 and rotatably connected to the movable rod 9; it also includes a guide assembly and a one-way transmission assembly disposed on the receiving plate 20 and connected to the movable rod 9, the guide assembly including a sliding plate 21 slidably mounted on the receiving plate 20, the sliding plate 21 having a vertical groove 2101 and an inclined groove 2102 formed thereon, the movable plate 5 having a limiting post 22 slidably engaged with the vertical groove 2101 and the inclined groove 2102, the one-way transmission assembly including a ratchet plate 23 disposed on the sliding plate 21, a ratchet 24 engaged with the ratchet plate 23 disposed on the movable rod 9, and a second spring 25 sleeved on the movable rod 9, the two ends of the second spring 25 abutting against the movable plate 5 and the ratchet 24 respectively.

[0065] Furthermore, the slot 801 is a cross-shaped groove, the mating plate 10 is a cross-shaped plate with dimensions similar to the slot 801, and the eccentric pressure block 11 is located on one of the extension posts of the mating plate 10.

[0066] In the initial state, the movable plate 5 is at its maximum lifting height. At this time, the movable rod 9 and the fixed plate 6 are in contact, which locks the position of the movable rod 9. The gap between the movable plate 5 and the ratchet 24 is the smallest. The extension of the second spring 25 in its natural state is greater than the minimum gap between the movable plate 5 and the ratchet 24. Therefore, the second spring 25 is in a compressed state and always provides the ratchet 24 with a pushing force away from the movable plate 5. In this state, the fitting plate 10 and the slot 801 are separated, and the gap between the fitting plate 10 and the slot 801 is the largest.

[0067] The limiting post 22 is located at the end of the stroke of the inclined groove 2102 near the movable plate 5. Under the action of the inclined groove 2102 and the limiting post 22, the sliding plate 21 is located at the maximum stroke on its horizontal displacement side. At this time, under the action of the ratchet plate 23 and the ratchet 24, the eccentric pressure block 11 is controlled to rotate to the required detection position by the movable rod 9 and the fitting plate 10.

[0068] When the sample needs to be tested for compressive strength, the hydraulic cylinder controls the movable plate 5 to slide along the guide column 3 axially and move towards the lower pressure plate 401. Since the second spring 25 is in a compressed state in the initial state, its elastic potential energy acts on the movable rod 9 through the ratchet 24, so that the end of the movable rod 9 is in contact with the fixed plate 6. Therefore, in the initial stage of the movable plate 5 moving down, the positions of the movable rod 9 and the fixed fitting plate 10 and eccentric pressure block 11 remain relatively fixed, while the movable plate 5 drives the upper pressure plate 8 and the slot 801 to gradually move closer to the fitting plate 10.

[0069] At the same time, the downward movement of the movable plate 5 causes the limiting post 22 fixed on it to move downward synchronously. The limiting post 22 slides along the inclined groove 2102 on the sliding plate 21. Since the inclined groove 2102 is inclined, the sliding of the limiting post 22 converts the linear movement of the movable plate 5 into the horizontal lateral movement of the sliding plate 21, driving the sliding plate 21 to move along the receiving plate 20 to the other side of its horizontal displacement. The movement of the sliding plate 21 causes the ratchet plate 23 fixed on it to move synchronously. Since the ratchet plate 23 and the ratchet wheel 24 are designed for unidirectional transmission, the ratchet plate 23 and the ratchet wheel 24 are in a slipping state in this direction of movement. Therefore, the ratchet wheel 24 does not rotate, ensuring that the eccentric pressure block 11 maintains a constant angle during the downward movement of the movable plate 5.

[0070] When the movable plate 5 moves down to the set position, the slot 801 on the upper pressure plate 8 is fully engaged with the fitting plate 10, and the upper pressure plate 8 and the fitting plate 10 combine to form a rigid whole. At this time, the limiting post 22 just disengages from the inclined groove 2102 and moves to the end of the stroke of the vertical groove 2101. The sliding plate 21 reaches the limit position on the other side of its horizontal displacement. As the movable plate 5 continues to move down, since the slot 801 and the fitting plate 10 are engaged and locked, the upper pressure plate 8 drives the movable rod 9 to move down synchronously through the fitting plate 10. The movement of the movable rod 9 causes its end to separate from the fixed plate 6. The downward movement of the movable rod 9 drives the eccentric pressure block 11 to continue moving downward through the interlocking plate 10 until the eccentric pressure block 11 contacts the upper surface of the sample and cooperates with the lower pressure plate 401 to complete the pressure test at this position. Since the interlocking plate 10 and the slot 801 form a cross-interlocking structure, the eccentric pressure block 11 will not deflect or shift during the pressure application process, ensuring that the pressure applied to the sample is always strictly transmitted along its axial direction.

[0071] When the pressure test at this position is completed, that is, when the pressure sensor detects that the applied pressure has reached the set value, the hydraulic cylinder reverses its action, controlling the movable plate 5 to start resetting and lifting upwards. This controls the movable rod 9 to move synchronously through the slot 801 and the fitting plate 10. When the movable rod 9 comes into contact with the fixed plate 6 again, the upward movement of the movable rod 9 stops, while the movable plate 5 continues to lift upwards, causing the slot 801 to gradually separate from the fitting plate 10. During this process, the limiting post 22 slides upwards along the vertical groove 2101, maintaining the locked state of the sliding plate 21.

[0072] When the slot 801 is completely separated from the mating plate 10, the limiting post 22 just disengages from the vertical groove 2101 and re-enters the inclined groove 2102. As the movable plate 5 continues to rise, the limiting post 22 slides along the inclined groove 2102, driving the sliding plate 21 to move horizontally in the opposite direction to reset. The reverse movement of the sliding plate 21 drives the ratchet plate 23 to move synchronously. In this direction of movement, the ratchet plate 23 and the ratchet wheel 24 are in a meshing state, driving the ratchet wheel 24 to rotate at a fixed angle. The rotation of the ratchet wheel 24 drives the movable rod 9 and the mating plate 10 to rotate synchronously, thereby driving the eccentric pressure block 11 to rotate around the axis of the movable rod 9 to the next detection position. When the movable plate 5 is raised to the maximum height, the limiting post 22 moves to the end of the stroke of the inclined groove 2102 away from the vertical groove 2101, the sliding plate 21 reaches the limit position on the other side of its horizontal displacement, the movable rod 9 rotates to the maximum angle, and the eccentric pressure block 11 completes one position switch and reaches the next detection point.

[0073] By repeating the above cycle of "downward detection - upward switching", the compressive strength test can be performed on multiple different positions on the upper surface of the sample in sequence, so as to realize the multi-directional compressive strength performance evaluation of the sample. In addition, the eccentric pressure block 11 is set on the interlocking plate 10 by bolts. If it is necessary to test the overall compressive strength performance of the sample, the bolts can be removed and the eccentric pressure block 11 can be removed, so that the bottom surface of the interlocking plate 10 can be directly used as the pressure surface. At this time, when the movable plate 5 moves down, the interlocking plate 10 and the upper pressure plate 8 are engaged and directly contact the upper surface of the sample, so as to realize the uniform pressure test of the entire sample.

[0074] In summary, the device can perform both multi-point local compressive strength testing and overall compressive strength testing on samples without replacing any parts, significantly improving the adaptability and flexibility of the testing device. At the same time, the cross-fitting structure between the slot 801 and the interlocking plate 10 ensures that the angle of the eccentric pressure block 11 is locked during the pressure application process, avoiding testing errors caused by the deviation of the pressure direction, and ensuring the accuracy and consistency of multi-directional testing results.

[0075] A method for detecting the compressive strength of recycled roadbed aggregate based on mechanical sensor sensing includes the following steps:

[0076] Step 1: Place the sample to be tested on the support assembly;

[0077] Step 2: Control the movable plate 5 to slide along the guide column 3, and control the limit wheel 13 to move towards the direction of the bearing component through the multi-directional centering mechanism;

[0078] Step 3: When the limiting wheel 13 abuts against the side of the sample, the multi-directional centering mechanism controls the limiting wheel 13 to give way and guides the sample to move to the center position of the bearing component. Then, under the action of the stamping component, the sample is subjected to a compressive strength test.

[0079] Step 4: After the position test is completed, the movable plate 5 is reset. Under the action of the rotation adjustment mechanism, the impact position of the stamping assembly is adjusted by the movable rod 9, and the above steps are repeated to complete the comprehensive test of the sample.

[0080] 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.

[0081] 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 detecting the compressive strength of recycled roadbed aggregate based on mechanical sensor sensing, comprising: The machine base, and the support platform set on the machine base, the support platform is equipped with guide columns, and the guide columns have movable plates that slide axially. Its characteristic is that it further includes: A support assembly is provided on the support platform to support the sample, and a pressure sensor is installed on the support assembly to detect the pressure state of the sample. A multi-directional centering mechanism is provided on the movable plate. The multi-directional centering mechanism is connected to a plurality of limiting wheels that are equidistantly distributed in a circle. The multi-directional centering mechanism can center the sample through the limiting wheels. A movable rod is slidably mounted on the movable plate and connected to the multi-directional centering mechanism; a stamping assembly is provided on the movable rod. A rotary adjustment mechanism is disposed on the movable plate and connected to the movable rod. The rotary adjustment mechanism can adjust the stamping position of the stamping assembly through the movable rod.

2. The device for detecting the compressive strength of recycled roadbed aggregate based on mechanical sensor sensing according to claim 1, characterized in that, The bearing assembly includes a lower pressure platform disposed on the bearing platform, and a lower pressure plate is disposed at the end of the lower pressure platform.

3. The device for detecting the compressive strength of recycled roadbed aggregate based on mechanical sensor sensing according to claim 1, characterized in that, The multi-directional centering mechanism includes a support sleeve disposed on the movable plate, the support sleeve being slidably connected to the movable rod, and an upper pressure plate being disposed at the end of the support sleeve; It also includes a swing assembly and a limiting assembly disposed on the support sleeve and connected to the upper pressure plate.

4. The device for detecting the compressive strength of recycled roadbed aggregate based on mechanical sensor sensing according to claim 3, characterized in that, The oscillation assembly includes a plurality of hinged rods that are hinged to the support sleeve and are equidistantly distributed around the circumference. The hinged rods are rotatably connected to the limiting wheel. The support sleeve has a movable ring that slides axially. A connecting rod that is hinged to the hinged rod is mounted on the movable ring. A first spring is fitted on the support sleeve. The two ends of the first spring abut against the movable ring and the upper pressure plate, respectively.

5. The device for detecting the compressive strength of recycled roadbed aggregate based on mechanical sensor sensing according to claim 4, characterized in that, The limiting component includes a connecting plate slidably mounted on the support sleeve, and a cylinder is provided on the upper pressure plate, with the telescopic end of the cylinder connected to the connecting plate.

6. The device for detecting the compressive strength of recycled roadbed aggregate based on mechanical sensor sensing according to claim 3, characterized in that, The stamping assembly includes a slot formed on the upper pressure plate, and the end of the movable rod is provided with a fitting plate that engages with the slot. An eccentric pressure block is provided on the fitting plate.

7. The device for detecting the compressive strength of recycled roadbed aggregate based on mechanical sensor sensing according to claim 1, characterized in that, The rotary adjustment mechanism includes a fixed plate disposed at the end of the guide post, the movable rod abutting against the fixed plate, a protruding post penetrating the fixed plate disposed on the movable plate, and a receiving plate slidably mounted on the protruding post and rotatably connected to the movable rod; It also includes a guide assembly and a one-way transmission assembly disposed on the receiving plate and connected to the movable rod.

8. The device for detecting the compressive strength of recycled roadbed aggregate based on mechanical sensor sensing according to claim 7, characterized in that, The guiding component includes a sliding plate slidably mounted on the receiving plate, the sliding plate having vertical grooves and inclined grooves, and the movable plate having a limiting post that slidably engages with the vertical grooves and inclined grooves.

9. The device for detecting the compressive strength of recycled roadbed aggregate based on mechanical sensor sensing according to claim 8, characterized in that, The one-way transmission assembly includes a ratchet plate disposed on the sliding plate, a ratchet wheel that meshes with the ratchet plate disposed on the movable rod, and a second spring sleeved on the movable rod, with the two ends of the second spring abutting against the movable plate and the ratchet wheel respectively.

10. A method for detecting the compressive strength of recycled roadbed aggregate based on mechanical sensor sensing, comprising the mechanical sensor-based detection device for detecting the compressive strength of recycled roadbed aggregate as described in any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Place the sample to be tested on the support assembly; Step 2: Control the movable plate to slide along the guide column, and control the limit wheel to move towards the bearing component through the multi-directional centering mechanism; Step 3: When the limiting wheel abuts against the side of the sample, the multi-directional centering mechanism controls the limiting wheel to move aside and guides the sample to the center position of the bearing component. Then, under the action of the stamping component, the sample is subjected to a compressive strength test. Step 4: After the test at this position is completed, the movable plate is reset. Under the action of the rotation adjustment mechanism, the impact position of the stamping assembly is adjusted by the movable rod, and the above steps are repeated to complete the comprehensive test of the sample.

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