A sampling device for highway construction detection

Abstract

This invention discloses a sampling device for highway construction testing, belonging to the field of highway construction testing technology. It includes a floor, a lifting mechanism, a drive motor, a fixing mechanism, a sampling cylinder, cutting teeth, and a sample securing mechanism. The sampling cylinder has longitudinal grooves on its sidewalls and depth markings. The sample securing mechanism is coaxially located on the outside of the sampling cylinder and includes a positioning and return assembly, a fixing ring, a ground-pressing power assembly, an integrated connecting assembly, a linkage push plate assembly, a fixing arc plate, and a limiting and positioning assembly. This device uses the road surface reaction force during drilling to trigger the core sample clamping. After drilling, the core sample can be simultaneously extracted with the cylinder, eliminating the need for additional tools and effectively preventing core sample breakage. The sampling cylinder is easy to assemble and disassemble, and it is suitable for core sampling and testing of various structural layers of highway pavement.

Description

Technical Field

[0001] This invention relates to the field of highway construction testing technology, specifically a sampling device for highway construction testing. Background Technology

[0002] In highway engineering quality inspection, core sampling is the core method for verifying the thickness, compaction degree and material strength of pavement structural layers. The complete and efficient extraction of core samples is the key to ensuring testing efficiency and data accuracy.

[0003] Existing road core sampling devices generally suffer from cumbersome core sampling operations: First, most drill barrels lack reliable clamping structures, making it easy for core samples to break and fall into the borehole during drilling. Additional tools such as pliers and core hooks are needed to retrieve them, resulting in low efficiency and potential secondary damage to the core samples. Second, while some devices can bring the core samples out with the drill barrel, they often become stuck inside the barrel wall, requiring tools like screwdrivers and rubber mallets to pry and knock them out. This is inconvenient and easily damages the edges of the core samples, interfering with subsequent testing accuracy. Third, conventional drill barrel disassembly and replacement require removing multiple sets of bolts, leading to low efficiency when changing between different specifications. Furthermore, drilling depth needs to be indirectly calculated and cannot be directly read, resulting in insufficient on-site operational convenience. A few devices with clamping functions rely on additional electric or pneumatic power sources, resulting in complex structures that are difficult to adapt to the dusty and vibrating working environment of field construction sites.

[0004] Therefore, there is an urgent need for a sampling device for highway construction testing to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a sampling device for highway construction testing to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A sampling device for highway construction testing includes: a platform, a lifting mechanism mounted on the platform, a drive motor mounted on the lifting mechanism, and a sampling cylinder that is connected to the output end of the drive motor. The lower end of the sampling cylinder has a plurality of cutting teeth arranged circumferentially, and the side wall of the sampling cylinder has a plurality of circumferentially arranged grooves. The output end of the drive motor is connected to one end of a fixing mechanism, and the other end of the fixing mechanism is connected to the top end of the sampling cylinder. The side wall of the sampling cylinder is longitudinally engraved with scale lines, and the sampling cylinder is provided with a sample fixing mechanism for clamping and fixing the core sample after sampling.

[0008] The sample fixing mechanism includes: a positioning and return component, a fixing ring, a ground pressing power component, an integrated connecting component, a linkage push plate component, a fixed arc plate, and a limiting and positioning component; the fixing ring is coaxially connected to the outside of the sampling cylinder through the positioning and return component; the ground pressing power component is slidably connected to the fixing ring; the integrated connecting component is rotatably mounted on the fixing ring and is used to connect the ground pressing power component and the fixing ring into a whole; one end of the linkage push plate component is connected to the fixing ring and the other end is connected to the fixed arc plate, and is used to drive the fixed arc plate to move; the fixed arc plate is located inside the groove; one end of the limiting and positioning component is connected to the integrated connecting component and the other end is connected to the outer wall of the sampling cylinder.

[0009] As a further embodiment of the present invention: the lifting mechanism includes: a vertical rod frame, a mounting block, a sliding sleeve, a threaded rod, and a handle.

[0010] The vertical pole frame is vertically fixedly installed on the floor. Sliding sleeves are fixedly provided on both sides of the mounting block. The sliding sleeves are slidably connected to the vertical pole frame. The drive motor is fixedly installed on the mounting block. The threaded rod is rotatably installed on the floor. The threaded rod passes through the mounting block and is threadedly connected to it. The handle is fixedly connected to the top of the threaded rod.

[0011] As a further embodiment of the present invention: the fixing mechanism includes: a ferrule, a fixing block, and a fixing bolt;

[0012] The ferrule is fixedly installed at the output end of the drive motor. The fixing block is slidably embedded in the inner side wall of the ferrule. The fixing bolt passes through the ferrule and the fixing block to fix and lock the ferrule and the fixing block together. The fixing block is connected to the top of the sampling cylinder.

[0013] As a further embodiment of the present invention: the positioning and return assembly includes: a fixing plate, a telescopic rod, a spring, a magnetic ring, and a magnetic ring.

[0014] The fixing plate is fixedly installed on the outer wall of the sampling cylinder. The telescopic rod is vertically connected between the top surface of the fixing plate and the bottom surface of the fixing ring. The spring is sleeved on the outside of the telescopic rod, with one end connected to the fixing plate and the other end connected to the fixing ring. The first magnetic ring is fixedly installed on the bottom surface of the fixing plate. The second magnetic ring is fixedly installed on the outer wall of the sampling cylinder and located at the bottom of the first magnetic ring. The opposite sides of the first and second magnetic rings are magnetically attracted to each other.

[0015] As a further embodiment of the present invention: the ground pressing power component includes: a sliding rod, a movable ring, a ball bearing, and a limiting plate;

[0016] The sliding rod slides vertically through the fixed ring, the movable ring is fixedly installed at the bottom end of the sliding rod, the ball bearings are rolled and embedded in the bottom surface of the movable ring, and the limiting plate is fixedly installed at the top end of the sliding rod.

[0017] As a further embodiment of the present invention: the integrated connecting component includes: a card slot, a rotating ring, a card block, a second grip, and a magnetic positioning component;

[0018] The top of the rotating ring and the fixed ring are rotatably connected. The rotating ring is a double-ring structure with coaxial arrangement and different diameters. The slot is opened on the sliding rod and is arranged longitudinally at equal intervals along the sliding rod. The card block is fixedly set on the rotating ring and is engaged with the corresponding slot. The second grip is fixedly connected to the rotating ring. The magnetic positioning component is set between the rotating ring and the fixed ring and is used to magnetically lock the rotation position of the rotating ring.

[0019] As a further aspect of the present invention: the magnetic positioning component includes: magnet one, magnet two, and magnet three;

[0020] Magnet one and magnet two are both fixed to the top of the rotating ring, and magnet three is fixed to the top of the fixed ring and located between magnet one and magnet two. Magnet three is magnetically attracted to the opposite side of magnet one and magnet two.

[0021] As a further aspect of the present invention: the linkage push plate assembly includes: a bent tube, a connecting rod, piston one, piston two, and a buffer assembly;

[0022] The bent tube is fixedly installed on the outer wall of the sampling cylinder. The piston one and piston two are respectively sealed and slidably disposed in the two sections of the bent tube. One end of the connecting rod is connected to piston one and the other end is connected to the fixing ring. One end of the buffer assembly is connected to piston two and the other end is connected to the fixing arc plate.

[0023] As a further embodiment of the present invention: the buffer assembly includes: a sliding sleeve, a fixing rod, and a spring.

[0024] The first sliding sleeve is connected to the second piston and is slidably connected to the bent tube. One end of the fixed rod is connected to the fixed arc plate, and the other end is slidably inserted into the first sliding sleeve and connected to one end of the second spring. The other end of the second spring is connected to the first sliding sleeve.

[0025] As a further embodiment of the present invention: the limiting and positioning component includes: a bending rod, a second sliding sleeve, a trapezoidal block, a third spring, an orifice plate, and a path limiting block;

[0026] One end of the bent rod is fixedly connected to the rotating ring, the second sliding sleeve is slidably connected to the other end of the bent rod, the trapezoidal block is fixedly installed on the sliding sleeve, one end of the third spring is connected to the trapezoidal block and the other end is connected to the bent rod, the orifice plate is fixedly installed on the outer wall of the sampling cylinder, and the path limiting block is set inside the orifice plate and connected to the inner wall of one side of the orifice plate.

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

[0028] Core sampling can be performed without additional tools, and the operation is convenient and efficient: The device holds the core sample by a circumferentially fixed arc plate of the sample fixing mechanism. After drilling is completed, the core sample can be lifted out of the borehole along with the sampling tube. After the drill is lifted, the sample fixing mechanism can be unlocked to automatically release the core sample. No additional auxiliary tools such as clamps, pry bars, or hammering tools are needed throughout the process. This avoids damage to the edges and corners of the core sample caused by prying with tools, greatly simplifies the core sampling operation process, and improves the efficiency of on-site testing.

[0029] Purely mechanical linkage triggering, with strong environmental adaptability: The solidification mechanism uses the road surface reaction force of the drilling feed as the power source, transmits displacement through the ground pressing power component, and converts it into radial clamping force through the linkage push plate component. No additional power device is required throughout the process. The structure is simple and reliable, suitable for complex working environments with dust and vibration in the field, and has a low failure rate.

[0030] Intuitive depth reading and stable clamping: The sampling tube has longitudinal depth scale lines engraved on its side wall, allowing direct observation of the actual drilling depth without the need for frequent drill lifting for verification; combined with the dual locking structure of the integrated connecting component and the limiting and positioning component, the clamping state is stable and reliable during drill lifting, effectively preventing the core sample from loosening and falling off midway. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of a sampling device for highway construction testing in an embodiment of the present invention.

[0032] Figure 2 This is a partial structural schematic diagram of a sampling device for highway construction testing according to an embodiment of the present invention.

[0033] Figure 3 This is a structural breakdown diagram of the fixing mechanism in an embodiment of the present invention.

[0034] Figure 4 This is a schematic diagram of the sampling cylinder and the sample fixing mechanism in an embodiment of the present invention.

[0035] Figure 5 This is a schematic diagram of the sample-fixing mechanism in an embodiment of the present invention.

[0036] Figure 6 This is a structural breakdown diagram of the sample-fixing mechanism in an embodiment of the present invention.

[0037] Figure 7 for Figure 6 A magnified schematic diagram of the structure at point A in the middle.

[0038] Figure 8 This is a schematic diagram of the structure of the ground pressure power component in an embodiment of the present invention.

[0039] Figure 9 This is a partial structural schematic diagram of the sample-fixing mechanism in an embodiment of the present invention.

[0040] Figure 10 This is a schematic diagram of the integrated connection component in an embodiment of the present invention.

[0041] Figure 11 This is a cross-sectional view of the linkage pusher assembly in an embodiment of the present invention.

[0042] Figure 12 This is a schematic diagram of the positioning and return component in an embodiment of the present invention.

[0043] Figure 13 This is a schematic diagram of the structure of the limiting and positioning component in an embodiment of the present invention.

[0044] Figure 14 This is a partial structural diagram of the integrated connecting component in an embodiment of the present invention.

[0045] Figure 15 This is a schematic diagram of the trapezoidal block in an embodiment of the present invention.

[0046] In the diagram: 1. Flooring; 2. Lifting mechanism; 3. Drive motor; 4. Fixing mechanism; 5. Sampling cylinder; 6. Cutting teeth; 7. Sample fixing mechanism; 21. Vertical rod frame; 22. Mounting block; 23. Sliding sleeve; 24. Threaded rod; 25. Handle one; 41. Sleeve; 42. Fixing block; 43. Fixing bolt; 71. Positioning and return assembly; 72. Fixing ring; 73. Ground pressing power assembly; 74. Integrated connection assembly; 75. Linkage push plate assembly; 76. Fixing arc plate; 77. Limiting and positioning assembly; 711. Fixing plate; 712. Telescopic rod; 713. Spring one; 714. Magnetic ring one; 715. Magnetic ring two; 731. 732. Sliding rod; 733. Moving ring; 734. Ball bearing; 735. Limiting plate; 746. Slot; 747. Rotating ring; 748. Block; 749. Grip two; 740. Magnetic positioning assembly; 7451. Magnet one; 7452. Magnet two; 7453. Magnet three; 751. Bending tube; 752. Connecting rod; 753. Piston one; 754. Piston two; 755. Buffer assembly; 7551. Sliding sleeve one; 7552. Fixed rod; 7553. Spring two; 771. Bending rod; 772. Sliding sleeve two; 773. Trapezoidal block; 774. Spring three; 775. Orifice plate; 776. Path limiting block. Detailed Implementation

[0047] 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.

[0048] In the embodiments of this invention, please refer to Figures 1 to 15 A sampling device for highway construction inspection includes a floor 1, a lifting mechanism 2, a drive motor 3, a fixing mechanism 4, a sampling cylinder 5, cutting teeth 6, and a sample fixing mechanism 7. The base plate 1 is a horizontally arranged rectangular flat plate structure with a sampling hole in the middle. During operation, the base plate 1 is placed flat on the road surface to be tested, providing a stable support reference for the entire device. The lifting mechanism 2 is vertically installed on the upper surface of the base plate 1. The drive motor 3 is mounted on the movable end of the lifting mechanism 2 and can be driven by the lifting mechanism 2 to perform vertical lifting and feeding movements. The sampling cylinder 5 is a hollow cylindrical structure with an open bottom. Its top end is connected to the output shaft end of the drive motor 3 through a fixing mechanism 4 and is driven by the drive motor 3 to rotate around its own axis. The lower edge of the sampling cylinder 5 has several carbide cutting teeth 6 evenly arranged circumferentially for rotary grinding and drilling into each structural layer of the road surface. The side wall of the sampling cylinder 5 has several sets of longitudinal grooves evenly distributed circumferentially. The outer side wall of the sampling cylinder 5 is also engraved with longitudinal depth scale lines, so that the operator can directly observe the drilling depth without frequent drilling verification. The sampling cylinder 5 is equipped with a sample fixing mechanism 7 for clamping and fixing the core sample after sampling.

[0049] As one embodiment of the present invention, please refer to Figure 1 and Figure 2 The lifting mechanism 2 includes: a vertical rod frame 21, a mounting block 22, a sliding sleeve 23, a threaded rod 24, and a handle 25. Two vertical rod frames 21 are provided, both vertically fixedly installed on the upper surface of the base plate 1, symmetrically distributed on the left and right sides of the sampling hole. Sliding sleeves 23 are fixedly connected to the left and right end faces of the mounting block 22, respectively. The sliding sleeves 23 on both sides are correspondingly slidably fitted onto the outside of the two vertical rod frames 21, allowing the mounting block 22 to slide stably vertically along the vertical rod frames 21. The drive motor 3 is fixedly installed on the mounting block 22. The threaded rod 24 is vertically arranged, with its bottom end rotatably mounted on the upper surface of the base plate 1 via a bearing seat. The rod body of the threaded rod 24 vertically penetrates the mounting block 22 and forms a threaded transmission engagement with the mounting block 22. The handle 25 is fixedly connected to the top of the threaded rod 24. During operation, rotating the handle 25 drives the threaded rod 24 to rotate, driving the mounting block 22 to rise and fall along the vertical rod frame 21 via threaded transmission, thus realizing drilling feed and drill lifting actions.

[0050] As one embodiment of the present invention, please refer to Figures 1 to 3The fixing mechanism 4 includes a retaining sleeve 41, a fixing block 42, and a fixing bolt 43. The retaining sleeve 41 is a cylindrical structure with an open bottom, and its top center is fixedly connected to the lower end of the output shaft of the drive motor 3, rotating synchronously with the output shaft. The fixing block 42 is fixedly installed at the top center of the sampling cylinder 5. The shape of the fixing block 42 is adapted to the inner cavity contour of the retaining sleeve 41, and it can slide axially into the retaining sleeve 41 to achieve circumferential limiting and torque transmission. The fixing bolt 43 passes radially through the retaining sleeve 41 and the fixing block 42, axially locking the retaining sleeve 41 and the fixing block 42. When disassembling and assembling the sampling cylinder 5, only one fixing bolt 43 needs to be loosened to pull the sampling cylinder 5 together with the fixing block 42 out of the retaining sleeve 41, making it convenient and efficient to replace sampling cylinders 5 of different diameters.

[0051] As one embodiment of the present invention, please refer to Figure 1 , Figures 4 to 15 The sample fixing mechanism 7 is coaxially installed on the outside of the sampling cylinder 5. It is used to form a circumferential clamping and fixing of the core sample inside the cylinder after drilling is completed, so as to facilitate the removal of the core sample. It includes: positioning and return component 71, fixing ring 72, ground pressing power component 73, integrated connection component 74, linkage push plate component 75, fixing arc plate 76 and limiting and fixing component 77. The fixing ring 72 is a circular ring structure, coaxially sleeved on the outside of the sampling cylinder 5. The fixing ring 72 is connected to the outer wall of the sampling cylinder 5 through multiple sets of positioning and return components 71 evenly distributed along the circumference, and can slide relative to each other along the axial direction of the sampling cylinder 5. The ground pressing power component 73 is slidably connected to the fixing ring 72. The integrated connecting component 74 is rotatably mounted on the fixing ring 72 and is used to connect the ground pressing power component 73 and the fixing ring 72 into a whole. One end of the linkage push plate component 75 is connected to the fixing ring 72, and the other end is connected to the fixed arc plate 76, which is used to drive the fixed arc plate 76 to move. The fixed arc plate 76 is located inside the groove. One end of the limiting and fixing component 77 is connected to the integrated connecting component 74, and the other end is connected to the outer wall of the sampling cylinder 5.

[0052] As one embodiment of the present invention, please refer to Figure 1 , Figure 4 , Figure 5 , Figure 6 , Figure 9 , Figure 10 and Figure 12The positioning and return assembly 71 includes: a fixed plate 711, a telescopic rod 712, a first spring 713, a first magnetic ring 714, and a second magnetic ring 715. The fixed plate 711 is horizontally fixedly installed on the outer wall of the sampling cylinder 5, corresponding to the position below the fixed ring 72; the telescopic rod 712 is vertically arranged, with its bottom end fixedly connected to the top surface of the fixed plate 711 and its top end fixedly connected to the bottom surface of the fixed ring 72, accurately guiding the sliding direction of the fixed ring 72 and preventing circumferential deflection; the first spring 713 is sleeved on the outside of the telescopic rod 712, with its lower end connected to the top surface of the fixed plate 711 and its upper end connected to the bottom surface of the fixed ring 72; Under normal conditions, spring 713 is in a slightly extended state, pulling the fixing ring 72 down to its initial high position. Magnetic ring 714 is fixed to the bottom surface of fixing plate 711, and magnetic ring 715 is fixedly embedded in the outer wall of sampling cylinder 5, located directly below magnetic ring 714. The opposite end faces of magnetic ring 714 and magnetic ring 715 are magnetically attracted to each other. When the fixing ring 72 is in its initial high position, magnetic ring 714 and magnetic ring 715 are attracted and cooperate to form an auxiliary positioning for the fixing ring 72, preventing the fixing ring 72 from shaking randomly when not in operation.

[0053] As one embodiment of the present invention, please refer to Figure 1 , Figures 4 to 10 The ground-pressing power assembly 73 includes: a sliding rod 731, a movable ring 732, a ball bearing 733, and a limiting plate 734. The sliding rod 731 slides vertically through the ring body of the fixed ring 72 and can slide up and down relative to the fixed ring 72. The movable ring 732 is fixedly installed at the bottom end of the sliding rod 731. The ball bearing 733 is rolled and embedded in the center of the bottom surface of the movable ring 732, and the bottom of the ball bearing 733 protrudes from the lower surface of the movable ring 732. During operation, the ball bearing 733 first contacts the road surface and can roll relative to the road surface as the sampling cylinder 5 rotates, converting sliding friction into rolling friction and reducing wear. The limiting plate 734 is fixedly installed at the top end of the sliding rod 731, and its diameter is larger than the rod diameter of the sliding rod 731. It is used to limit the sliding rod 731 from sliding down out of the fixed ring 72, forming a downward limit.

[0054] As one embodiment of the present invention, please refer to Figure 1 , Figure 4 , Figure 5 , Figure 6 , Figure 9 , Figure 10 and Figure 14The integrated connecting component 74 is rotatably disposed on the top of the fixed ring 72 and is used to lock the sliding rod 731 and the fixed ring 72 together to lock the clamping stroke. It includes: a slot 741, a rotating ring 742, a locking block 743, a second grip 744 and a magnetic positioning component 745. The rotating ring 742 is a coaxial double-ring structure, rotatably mounted on the top surface of the fixed ring 72 via a plane bearing, and can rotate horizontally around the axis of the fixed ring 72. The slots 741 are formed on one side wall of the sliding rod 731, and multiple sets are arranged at equal intervals along the axial direction of the sliding rod 731 to form multiple locking positions. The locking blocks 743 are fixedly mounted on the rotating ring 742, and their number corresponds one-to-one with the sliding rods 731. When the rotating ring 742 rotates, it can drive the locking blocks 743 to engage in the corresponding height slots 741, thereby locking the sliding rod 731 and the fixed ring 72 relative to each other, preventing axial relative displacement between them. The second grip 744 is fixedly connected to the rotating ring 742 and is used by the operator to rotate the rotating ring 742 to complete the locking and unlocking operations. The magnetic positioning component 745 is set between the rotating ring 742 and the fixed ring 72 and is used to magnetically position the two rotating positions of the rotating ring 742 for locking and unlocking, preventing positional displacement caused by vibration.

[0055] As one embodiment of the present invention, please refer to Figure 1 , Figure 4 , Figure 5 , Figure 6 , Figure 9 , Figure 10 and Figure 14 The magnetic positioning component 745 includes: magnet one 7451, magnet two 7452, and magnet three 7453. Magnet one 7451 and magnet two 7452 are both fixedly embedded on the top surface of the rotating ring 742 and arranged at a certain angle along the circumference; magnet three 7453 is fixedly embedded on the top surface of the fixed ring 72 and is located on the rotation path between magnet one 7451 and magnet two 7452; the end faces of magnet three 7453 and magnet one 7451 are magnetically attracted, corresponding to the locking position of the locking block 743 entering the locking position of the locking slot 741; the end faces of magnet three 7453 and magnet two 7452 are magnetically attracted, corresponding to the unlocking position of the locking block 743 disengaging from the locking slot 741; the magnetic attraction force keeps the rotating ring 742 stable in the corresponding position, avoiding the rotating ring 742 from deflecting on its own due to vibration during the drilling process.

[0056] As one embodiment of the present invention, please refer to Figure 1 , Figures 4 to 6 , Figures 9 to 11The linkage push plate assembly 75 is configured one-to-one with the fixed arc plate 76 to convert the vertical displacement of the fixed ring 72 into the radial reciprocating motion of the fixed arc plate 76. It includes: a bent tube 751, a connecting rod 752, a piston one 753, a piston two 754, and a buffer assembly 755. The bent tube 751 is an L-shaped, sealed tube fixedly installed on the outer wall of the sampling cylinder 5, with its vertical section opening upwards and its horizontal section facing the groove on the side wall of the sampling cylinder 5. The piston one 753 is slidably disposed within the vertical section of the bent tube 751. The connecting rod 752 is vertically positioned, its top end fixedly connected to the bottom surface of the piston one 753, and its bottom end extending downwards from the bent tube 751 and fixedly connected to the top surface of the fixed ring 72. The piston two... The 754 sealing sliding is set inside the horizontal section of the bent pipe 751. The inside of the bent pipe 751 and the sealed cavity between piston 1 753 and piston 2 754 are filled with transmission hydraulic oil or gas. When the fixed ring 72 moves upward relative to the sampling cylinder 5, it pushes piston 1 753 upward through the connecting rod 752, squeezing the hydraulic oil or gas in the sealed cavity. The hydraulic oil or gas transmits pressure to drive piston 2 754 to move along the horizontal pipe section towards the inside of the sampling cylinder 5, outputting radial clamping power.

[0057] As one embodiment of the present invention, please refer to Figure 11 The buffer assembly 755 is connected between the piston 754 and the fixed arc plate 76 to provide clamping buffer and prevent rigid clamping from damaging the core sample. It includes a sliding sleeve 7551, a fixed rod 7552, and a spring 7553. The sliding sleeve 7551 is a sleeve structure with one open end. Its closed end is fixedly connected to the inner end face of the piston 754, and its open end faces the inside of the sampling cylinder 5. The inner end of the fixed rod 7552 is fixedly connected to the outer arc surface of the fixed arc plate 76, and the outer end of the fixed rod 7552 is slidably inserted into the inner cavity of the sliding sleeve 7551. The spring 7553 is disposed in the inner cavity of the sliding sleeve 7551, with its outer end connected to the inner wall of the sliding sleeve 7551 and its inner end connected to the outer end of the fixed rod 7552. When the fixed arc plate 76 contacts the side wall of the core sample, if the piston 754 continues to advance, the fixed rod 7552 will retract into the sliding sleeve 7551 and compress the spring 7553. The spring force forms a flexible clamp, which ensures the clamping friction and avoids rigid extrusion that could damage the edges and corners of the core sample.

[0058] In this embodiment, the fixed arc plate 76 is an arc-shaped plate structure coaxially arranged with the sampling cylinder 5, and is embedded in the groove of the side wall of the sampling cylinder 5. It can slide radially back and forth along the groove. The inner arc surface of the fixed arc plate 76 is provided with anti-slip rough texture to increase the friction with the side wall of the core sample, improve the clamping stability, and prevent the core sample from sliding down during the lifting process.

[0059] As one embodiment of the present invention, please refer to Figure 1, Figure 4 , Figure 5 , Figure 6 , Figure 9 , Figure 10 , Figure 13 and Figure 15 , the position-limiting and shaping component 77 is arranged between the rotating ring 742 and the outer wall of the sampling cylinder 5, and is used to ensure the clamping effect after the core sample is clamped and fixed, and includes: a bent rod 771, a second sliding sleeve 772, a trapezoidal block 773, a third spring 774, a square plate 775 and a path limiting block 776. The lower end of the bent rod 771 is fixedly connected to the rotating ring 742, and the upper end extends horizontally towards the side close to the sampling cylinder 5; the second sliding sleeve 772 is slidably sleeved on the upper rod body of the bent rod 771 and can slide along the rod body direction of the bent rod 771; the trapezoidal block 773 is fixedly installed at one end of the second sliding sleeve 772, and its radial cross-section is a trapezoidal structure; the third spring 774 is arranged inside the second sliding sleeve 772, one end is connected to the trapezoidal block 773, and the other end is connected to the bent rod 771. Under normal conditions, the third spring 774 pushes the trapezoidal block 77向内 (i.e., towards the side close to the sampling cylinder 5); the square plate 775 is a square frame structure and is fixedly installed on the outer wall of the sampling cylinder 5; the path limiting block 776 is fixedly arranged on one inner wall inside the square plate 775 (when the clamping block 743脱离 the unlocking position of the clamping groove 741, the trapezoidal block 773 is located below the other side of the path limiting block 776; when the clamping block 743卡入 the locking position of the clamping groove 741, the trapezoidal block 773 is located below the same side of the path limiting block 776; the path limiting block 776 makes the inner cavity of the square plate 775 form a "匚" shape), and the trapezoidal block 773 can slide horizontally in an arc in the frame cavity of the square plate 775 along with the rotation of the rotating ring 742, and can also slide longitudinally in the frame cavity of the square plate 775 along with the longitudinal movement of the fixed ring 72; when the fixed ring 72 moves upward and the fixed arc plate 76 fixes and locks the core sample, the bottom surface of the trapezoidal block 773 abuts and cooperates with the top of the path limiting block 776 to form longitudinal limitation, ensuring that the fixed arc plate 76 is in the core fixing position.

[0060] The working principle of the present invention is: place the floor plate 1 horizontally at the pavement detection point to be detected, align the middle sampling hole with the marking point, embed the fixing block 42 at the top of the sampling cylinder 5 upward into the inner cavity of the chuck 41 at the lower end of the driving motor 3, and tighten the fixing bolt 43 to complete axial locking, realizing the rapid installation of the sampling cylinder 5. Rotate the first handle 25 to drive the threaded rod 24 to rotate, and drive the mounting block 22 to descend along the vertical rod frame 21 through threaded transmission, so that the cutting teeth 6 at the lower end of the sampling cylinder 5 contact the pavement marking point;

[0061] Based on the design thickness of the road surface structure layer of this section, the height of the movable ring 732 is adjusted so that the bottom height of the ball bearing 733 is above the road surface thickness (e.g., if the road surface design thickness is 10 cm, then the bottom height of the ball bearing 733 is 11 cm). After the adjustment is completed, the rotating ring 742 is rotated so that the magnet three 7453 is disengaged from the magnet two 7452. When the locking block 743 is inserted into the corresponding locking slot 741, the magnet three 7453 is magnetically connected to the magnet one 7451, positioning the rotating ring 742 so that the rotating ring 742, the fixed ring 72, the movable ring 732, and the sliding rod 731 form a whole and move synchronously. At this time, the trapezoidal block 773 is located on the same side below the path limiting block 776.

[0062] Start the drive motor 3, which drives the sampling cylinder 5 to rotate at high speed around the axis; at the same time, slowly rotate the handle 25 to feed downwards, and the cutting teeth 6 grind the road material to begin drilling. As the sampling cylinder 5 continues to penetrate deeper into the road surface, when the drilling depth reaches the designed total thickness, it basically reaches the bottom (at this time, the sound of the core drill motor becomes significantly lighter, the vibration of the machine body decreases, and the resistance of the feed handle drops sharply; when it cannot penetrate, the drill bit continues to bite the hard mixture, with high resistance and a muffled sound from the motor; once the structural layer is penetrated, the drill bit enters the loose layer / underlying layer below, and the resistance is released instantly). Then, slowly drill 2-3 cm to ensure penetration (at this time, the controller controls the speed of the drive motor 3 to decrease; if the lower layer is a relatively loose soil layer such as plain soil, the drive motor 3 stops rotating). During the process of ensuring penetration, the ball bearing 733 in the ground compaction power component 73 first contacts the original road surface; when the sampling cylinder 5 continues to feed downwards (at this time, it has penetrated), the reaction force of the road surface pushes the fixed ring 72 to slide upwards relative to the sampling cylinder 5, the telescopic rod 712 is stretched, and the spring 713 is stretched and stores energy).

[0063] During the upward movement of the fixed ring 72, the connecting rod 752 drives the piston 753 to move upward along the vertical section of the bent pipe 751, squeezing the hydraulic oil or gas in the sealed cavity; the hydraulic oil or gas transmits the pressure to the piston 754, driving the piston 754 to move along the horizontal pipe section towards the inside of the sampling cylinder 5, and then through the buffer assembly 755 pushes the fixed arc plate 76 to extend into the inside of the sampling cylinder 5 along the groove, gradually pressing against the outer wall of the core sample. Multiple sets of fixed arc plates 76 move synchronously to form circumferential clamping (because the road surface has been drilled through during the clamping process of the fixed arc plate 76, the core sample will rotate synchronously with the sampling cylinder 5. The fixed arc plate 76 is relatively long, which can clamp the core sample over a large range. At the same time, the rotation speed of the sampling cylinder 5 decreases to ensure that the core sample will not break).

[0064] During the upward movement of the fixed ring 72, the trapezoidal block 773 moves upward synchronously. The inclined structure at the top of the trapezoidal block 773 ensures that when the trapezoidal block 773 abuts against the path limiting block 776, the spring 774 can be compressed, allowing the trapezoidal block 773 to continue to rise. When the bottom of the trapezoidal block 773 moves above the path limiting block 776, the rotation of the threaded rod 24 stops. At this time, the bottom of the trapezoidal block 773 abuts against the top of the path limiting block 776, limiting the fixed ring 72 and preventing the fixed ring 72 from falling back to its original position.

[0065] Once the drilling reaches the target depth and the fixed arc plate 76 stably clamps the core sample, the operator rotates the threaded rod 24 in the opposite direction to remove the sampling cylinder 5. Then, the operator reverses the grip 744 to rotate the rotating ring 742, causing the locking block 743 on the rotating ring 742 to disengage from the corresponding height slot 741 on the sliding rod 731. At this time, the magnet 7452 rotates with the rotating ring 742 until it aligns with the magnet 7453. The two magnetically attract each other to maintain the unlocked position. The rotating ring 742 drives the trapezoidal block 773 to move synchronously, causing the bottom of the trapezoidal block 773 to disengage from the path limiting block 776. The stretched spring 713 retracts and resets, pulling the fixed ring 72 to slide downward relative to the sampling cylinder 5. The downward movement of the fixed ring 72 causes the connecting rod 752 and the piston 753 to move downward, reducing the pressure in the sealed cavity of the bent tube 751. The piston 754 drives the fixed arc plate 76 to retract outward and release the clamping of the core sample, allowing the core sample to be completely removed for testing.

[0066] 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.

[0067] 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 sampling device for highway construction inspection, comprising: The sample tube comprises a floor, a lifting mechanism mounted on the floor, a drive motor mounted on the lifting mechanism, and a sampling tube connected to the output end of the drive motor. The lower end of the sampling tube has several cutting teeth arranged circumferentially, and the side wall of the sampling tube has several sets of circumferentially arranged grooves. The characteristic feature is that the output end of the drive motor is connected to one end of a fixing mechanism, the other end of the fixing mechanism is connected to the top end of the sampling tube, the side wall of the sampling tube is longitudinally engraved with scale lines, and the sampling tube is provided with a sample fixing mechanism for clamping and fixing the core sample after sampling. The sample fixing mechanism includes: a positioning and return component, a fixing ring, a ground pressing power component, an integrated connecting component, a linkage push plate component, a fixed arc plate, and a limiting and positioning component; the fixing ring is coaxially connected to the outside of the sampling cylinder through the positioning and return component; the ground pressing power component is slidably connected to the fixing ring; the integrated connecting component is rotatably mounted on the fixing ring and is used to connect the ground pressing power component and the fixing ring into a whole; one end of the linkage push plate component is connected to the fixing ring and the other end is connected to the fixed arc plate, and is used to drive the fixed arc plate to move; the fixed arc plate is located inside the groove; one end of the limiting and positioning component is connected to the integrated connecting component and the other end is connected to the outer wall of the sampling cylinder.

2. The sampling device for highway construction detection according to claim 1, characterized in that, The lifting mechanism includes: a vertical rod frame, a mounting block, a sliding sleeve, a threaded rod, and a handle. The vertical pole frame is vertically fixedly installed on the floor. Sliding sleeves are fixedly provided on both sides of the mounting block. The sliding sleeves are slidably connected to the vertical pole frame. The drive motor is fixedly installed on the mounting block. The threaded rod is rotatably installed on the floor. The threaded rod passes through the mounting block and is threadedly connected to it. The handle is fixedly connected to the top of the threaded rod.

3. The sampling device for highway construction testing according to claim 1, characterized in that, The fixing mechanism includes: a ferrule, a fixing block, and a fixing bolt; The ferrule is fixedly installed at the output end of the drive motor. The fixing block is slidably embedded in the inner side wall of the ferrule. The fixing bolt passes through the ferrule and the fixing block to fix and lock the ferrule and the fixing block together. The fixing block is connected to the top of the sampling cylinder.

4. The sampling device for highway construction detection according to claim 1, characterized in that, The positioning and return assembly includes: a fixed plate, a telescopic rod, a spring, a magnetic ring, and a magnetic ring. The fixing plate is fixedly installed on the outer wall of the sampling cylinder. The telescopic rod is vertically connected between the top surface of the fixing plate and the bottom surface of the fixing ring. The spring is sleeved on the outside of the telescopic rod, with one end connected to the fixing plate and the other end connected to the fixing ring. The first magnetic ring is fixedly installed on the bottom surface of the fixing plate. The second magnetic ring is fixedly installed on the outer wall of the sampling cylinder and located at the bottom of the first magnetic ring. The opposite sides of the first and second magnetic rings are magnetically attracted to each other.

5. The sampling device for highway construction detection according to claim 1, characterized in that, The ground-pressing power assembly includes: a sliding rod, a movable ring, ball bearings, and a limiting plate; The sliding rod slides vertically through the fixed ring, the movable ring is fixedly installed at the bottom end of the sliding rod, the ball bearings are rolled and embedded in the bottom surface of the movable ring, and the limiting plate is fixedly installed at the top end of the sliding rod.

6. The sampling device for highway construction detection according to claim 5, characterized in that, The integrated connection assembly includes: a card slot, a rotating ring, a card block, a second grip, and a magnetic positioning assembly; The top of the rotating ring and the fixed ring are rotatably connected. The rotating ring is a double-ring structure with coaxial arrangement and different diameters. The slot is opened on the sliding rod and is arranged longitudinally at equal intervals along the sliding rod. The card block is fixedly set on the rotating ring and is engaged with the corresponding slot. The second grip is fixedly connected to the rotating ring. The magnetic positioning component is set between the rotating ring and the fixed ring and is used to magnetically lock the rotation position of the rotating ring.

7. The sampling device for highway construction detection according to claim 6, characterized in that, The magnetic positioning component includes: magnet one, magnet two, and magnet three; Magnet one and magnet two are both fixed to the top of the rotating ring, and magnet three is fixed to the top of the fixed ring and located between magnet one and magnet two. Magnet three is magnetically attracted to the opposite side of magnet one and magnet two.

8. The sampling device for highway construction detection according to claim 1, characterized in that, The linkage push plate assembly includes: a bent tube, a connecting rod, piston one, piston two, and a buffer assembly; The bent tube is fixedly installed on the outer wall of the sampling cylinder. The piston one and piston two are respectively sealed and slidably disposed in the two sections of the bent tube. One end of the connecting rod is connected to piston one and the other end is connected to the fixing ring. One end of the buffer assembly is connected to piston two and the other end is connected to the fixing arc plate.

9. A sampling device for highway construction testing according to claim 8, characterized in that, The buffer assembly includes: a sliding sleeve, a fixing rod, and a spring. The first sliding sleeve is connected to the second piston and is slidably connected to the bent tube. One end of the fixed rod is connected to the fixed arc plate, and the other end is slidably inserted into the first sliding sleeve and connected to one end of the second spring. The other end of the second spring is connected to the first sliding sleeve.

10. The sampling device for highway construction detection according to claim 6, characterized in that, The limiting and positioning assembly includes: a bending rod, a sliding sleeve II, a trapezoidal block, a spring III, an orifice plate, and a path limiting block; One end of the bent rod is fixedly connected to the rotating ring, the second sliding sleeve is slidably connected to the other end of the bent rod, the trapezoidal block is fixedly installed on the sliding sleeve, one end of the third spring is connected to the trapezoidal block and the other end is connected to the bent rod, the orifice plate is fixedly installed on the outer wall of the sampling cylinder, and the path limiting block is set inside the orifice plate and connected to the inner wall of one side of the orifice plate.

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