A rapid detection device and method for road surface compactness

Abstract

The application relates to the field of detection, in particular to a rapid detection device and method for road surface compactness. The detection device comprises a drilling machine and a drill bit; the drill bit comprises a barrel seat, a plurality of mounting pieces and a plurality of cutting wheels; the barrel seat is coaxially arranged at the tail end of a drill rod on the drilling machine, the plurality of mounting pieces are uniformly arranged at the lower end of the barrel seat in the circumferential direction of the barrel seat and extend downward, the plurality of mounting pieces can slide up and down, a first elastic member is arranged between each mounting piece and the barrel seat, the plurality of cutting wheels correspond to the plurality of mounting pieces one by one, the cutting wheels are embedded in the bottom of the mounting pieces and the axis of the cutting wheels is perpendicular to the axis of the barrel seat, and the cutting wheels are configured to be capable of cutting the road surface. Through the arrangement of the plurality of mounting pieces and the cutting wheels, the cutting part of the drill bit forms a split structure, in the cutting process, if a hard stone block is encountered, the corresponding mounting piece and cutting wheel move upward to avoid, the hard stone block is prevented from falling off due to excessive vibration caused by forced cutting, and the integrity of the sample core is ensured.

Description

Technical Field

[0001] This invention relates to the field of testing, and specifically to a rapid testing device and method for road surface compaction. Background Technology

[0002] Road surface compaction, also known as tamping, is a key indicator for measuring the quality of road construction, directly affecting the stability, bearing capacity, and service life of the subgrade and pavement. Methods for testing road surface compaction include the sand cone method, ring cutter method, core drilling method, and nuclear density meter method. Among these, the core drilling method remains widely used in the industry due to its simplicity, low cost, and high accuracy.

[0003] In recent years, the application of new materials containing regenerated aggregates in road construction has been vigorously promoted. Regenerated aggregates are recycled materials made from solid waste such as construction waste and engineering waste through processes such as crushing and screening. They replace part or all of the natural aggregates (such as stones and gravel) in road paving. The application of these materials is an important practice to promote the green and low-carbon development of cities. Road surfaces using regenerated aggregates often contain large-diameter recycled crushed stone. When using core drilling to test compaction, the sampling drill bit faces significant cutting difficulties when encountering large crushed stone or large concrete fragments. The contact between the drill bit and large aggregate particles can easily generate excessive vibration, causing large particles to detach from the core sample. This results in uneven surfaces on the core, incomplete core samples, and affects volume determination and subsequent measurement results.

[0004] The information disclosed in the background section of this invention is intended only to enhance the understanding of the general background of this invention, and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention proposes a rapid detection device and method for road compaction, thereby solving the problems of poor sample core integrity and inaccurate detection results in existing road compaction detection devices.

[0006] The rapid detection device for road surface compaction of the present invention adopts the following technical solution: including:

[0007] A drilling rig, on which a drill rod is mounted, is configured to drive the drill rod to rotate and to move the drill rod axially.

[0008] The drill bit includes a barrel, several mounting plates, and several cutting wheels. The barrel is coaxially disposed at the end of the drill rod. Several mounting plates are evenly disposed at the lower end of the barrel along the circumference and extend downward. The mounting plates are arc-shaped and form a cavity for accommodating the core sample. The mounting plates can slide up and down. Each mounting plate is provided with a first elastic element between itself and the barrel. The first elastic element tends to position the mounting plate at its lower limit. Several cutting wheels correspond one-to-one with several mounting plates. The cutting wheels are embedded in the bottom of the mounting plates and their axes are perpendicular to the axis of the barrel. The cutting wheels are configured to cut the road surface.

[0009] Optionally, the mounting plate is provided with a guide groove, which includes an arc segment and circular holes connected to both ends of the arc segment. The diameter of the circular holes is larger than the width of the arc segment. A limiting shaft protrusion is provided at the axis of the cutting wheel. The limiting shaft protrusion is slidably disposed in the guide groove, and the width of the limiting shaft protrusion is adapted to the arc segment, and the length of the limiting shaft protrusion is adapted to the diameter of the circular hole.

[0010] The drill bit also includes a transmission structure and a limiting assembly. The transmission structure is configured to convert the upward movement of the mounting plate into the rotation of the cutting wheel when the limiting shaft of the cutting wheel is protruding into the circular hole of the guide groove, thereby increasing the cutting speed of the cutting wheel.

[0011] The limiting component is configured such that the limiting shaft of the cutting wheel tends to be within the arcuate section of the guide groove and prevents the mounting piece from moving upward when the limiting shaft of the cutting wheel is within the arcuate section of the guide groove, and is configured to allow the mounting piece to move upward when the limiting shaft of the cutting wheel is within the circular hole of the guide groove.

[0012] Optionally, the transmission structure includes protruding teeth disposed on the left and right sides of the mounting plate, with multiple protruding teeth evenly disposed in the vertical direction, and cutting teeth evenly disposed in the circumferential direction of the cutting wheel, the cutting teeth being able to mesh with the protruding teeth.

[0013] Optionally, the limiting component includes a locking block and a stop bar;

[0014] The bottom of the mounting plate is provided with an insert groove, which divides the bottom of the mounting plate into an inner plate and an outer plate. A guide groove is provided on the outer plate, and a mounting hole is provided on the inner plate. The peripheral wall of the mounting hole includes two opposing arc surfaces and an inclined surface connecting the two ends of the arc surfaces. The arc surfaces and the inclined surface are tangent.

[0015] The locking block is set in the mounting hole, and the two ends of the locking block slide in contact with the arc segment of the mounting hole so that the locking block can rotate around the center of the mounting hole; the two sides of the locking block are provided with spring strips, which abut against the two inclined surfaces on the corresponding sides of the mounting hole. The spring strips can deform, and the spring strips tend to keep the locking block in a vertical position; the limiting shaft protrusion at the center of the cutting wheel is rotatably connected to the lower end of the locking block.

[0016] The stop bar is mounted on the cylinder base, and the stop bar is slidably inserted into the mounting plate with its lower end connected to the mounting hole.

[0017] The block has an internal cavity that extends through both sides of the block. The spring bar avoids the cavity of the block to allow the stop bar to be inserted.

[0018] Optionally, two spring bars are provided on each side of the card block, with the two spring bars on the same side respectively located on the front and rear sides of the inner cavity of the card block.

[0019] Optionally, baffles are provided at both ends of the arc-shaped surface of the mounting hole.

[0020] Optionally, the cylinder base includes a base cylinder and a limiting ring coaxially disposed on the outer periphery of the bottom of the base cylinder. The limiting ring is provided with a number of through grooves evenly distributed along the circumferential direction and extending vertically. The mounting piece is slidably disposed in the through grooves.

[0021] Optionally, the mounting plate includes a main body and a limiting top plate, the limiting top plate being detachably connected to the top of the main body, and the limiting top plate being able to cooperate with the limiting ring for stopping.

[0022] Optionally, the first elastic element is a compression spring.

[0023] A rapid method for detecting pavement compaction, using the aforementioned rapid pavement compaction detection device, specifically includes the following steps:

[0024] Step 1: Determine the road sampling point, move the drilling rig to the vicinity of the sampling point, and position the drill bit at the sampling point;

[0025] Step 2: Start the drilling rig. The drilling rig drives the drill bit to rotate through the drill rod and feeds it towards the road surface.

[0026] Step 3: Cutting complete. Lift the drill bit and remove the core sample.

[0027] The beneficial effects of the present invention are as follows: The rapid detection device for road compaction of the present invention, through the arrangement of several mounting plates and cutting wheels, makes the cutting part of the drill bit form a split structure. During the cutting process, if a harder stone is encountered, the corresponding mounting plates and cutting wheels move upward to avoid it, so as to avoid the hard stone falling off due to excessive vibration caused by forced cutting, and to ensure the integrity of the sample core.

[0028] Furthermore, the cutting wheel is configured to have two states: synchronous rotation with the mounting plate and the ability to rotate on its own axis. The state of the cutting wheel is controlled and switched via a limit component, and the upward movement of the mounting plate is converted into the rotation of the cutting wheel through a transmission structure. Under normal operating conditions (without encountering hard stones), the cutting wheel rotates synchronously with the mounting plate to cut the road surface. When the cutting wheel encounters a hard stone, it switches to the ability to rotate on its own axis. The cutting wheel, obstructed by the hard stone, drives the mounting plate upward, avoiding the hard stones and preventing excessive vibration from forced cutting, thus ensuring the integrity of the core sample. Simultaneously, as the mounting plate moves upward relative to the cylinder, the transmission structure causes the cutting wheel to rotate around its own axis. This rotation accelerates the cutting speed of the hard stones, allowing for efficient and stable cutting while avoiding them. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the overall structure of a rapid detection device for road surface compaction according to the present invention;

[0031] Figure 2 This is a schematic diagram of the drill bit structure in a rapid road compaction detection device of the present invention;

[0032] Figure 3 for Figure 2 The front view;

[0033] Figure 4 for Figure 3 A three-dimensional view cut along the AA direction;

[0034] Figure 5 This is a schematic diagram of another state of the drill bit (one of the mounting plates is moved upwards);

[0035] Figure 6 for Figure 5 The front view;

[0036] Figure 7 for Figure 6 BB section view;

[0037] Figure 8 for Figure 6 3D cross-section of the middle BB;

[0038] Figure 9 for Figure 8 Enlarged view at point X;

[0039] Figure 10 This is an exploded view of the drill bit;

[0040] Figure 11 This is a schematic diagram showing the fit between the mounting plate and its mechanism.

[0041] Figure 12 for Figure 11 The exploded diagram.

[0042] In the picture:

[0043] 100. Drilling rig; 101. Drill rod;

[0044] 200, Drill bit; 201, Cylinder base; 20100, Base cylinder; 20101, Limiting ring; 2011, Stop bar; 202, Mounting plate; 20200, Main body; 20201, Limiting top plate; 2021, First elastic element; 2022, Guide groove; 2023, Mounting hole; 20231, Stop bar; 20232, Limiting protrusion; 2024, Protruding tooth; 203, Locking block; 2031, Spring bar; 204, Cutting wheel; 2041, Limiting shaft protrusion. 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] like Figures 1 to 12 As shown, the embodiment of the present invention provides a rapid detection device for road compaction, which includes a drilling rig 100 and a drill bit 200; a drill rod 101 is installed on the drilling rig 100, and the drilling rig 100 is configured to drive the drill rod 101 to rotate and drive the drill rod 101 to move axially, and the drill bit 200 is coaxially disposed at the end of the drill rod 101.

[0047] The drill bit 200 includes a cylinder seat 201, a plurality of mounting plates 202, and a plurality of cutting wheels 204. The cylinder seat 201 is coaxially disposed at the end of the drill rod 101. The plurality of mounting plates 202 are evenly disposed at the lower end of the cylinder seat 201 along the circumferential direction and extend downward. The plurality of mounting plates 202 are arc-shaped and thus form a receiving cavity for accommodating the sample core. The plurality of mounting plates 202 can slide up and down. A first elastic element 2021 is disposed between each mounting plate 202 and the cylinder seat 201. The first elastic element 2021 makes the mounting plate 202 tend to be in the lower limit position. Preferably, the first elastic element 2021 is a compression spring. The plurality of cutting wheels 204 correspond one-to-one with the plurality of mounting plates 202. The cutting wheels 204 are embedded in the bottom of the mounting plates 202 and their axes are perpendicular to the axis of the cylinder seat 201. The cutting wheels 204 are configured to cut the road surface.

[0048] In use, the rapid detection device for road compaction of the present invention is moved to the preset sampling point on the road surface, the drilling rig 100 is started, the drilling rig 100 drives the drill bit 200 to rotate through the drill rod 101 and feeds vertically downward to the road surface, the cutting wheel 204 cuts the road surface, and the cut sample core is contained in the receiving cavity surrounded by several mounting plates 202. After the cutting is completed, the drill bit 200 is lifted and the sample core is taken out to realize the core sampling.

[0049] During sampling, if the cutting wheel 204 encounters a hard rock, making it difficult to cut, the cutting wheel 204 will be blocked by the hard rock, and the cutting resistance will gradually increase. As the cutting resistance increases, the cutting wheel 204, pushed by the hard rock, overcomes the elastic force of the first elastic element 2021 and drives the mounting plate 202 to move upward, avoiding the hard rock and reducing excessive vibration caused by forced cutting, thus ensuring the integrity of the core sample. In other words, the solution in this embodiment, through the arrangement of several mounting plates 202 and the cutting wheel 204, makes the cutting part of the drill bit 200 form a split structure. During the cutting process, if a hard rock is encountered, the corresponding mounting plate 202 and the cutting wheel 204 move upward to avoid it, preventing the hard rock from falling off due to excessive vibration caused by forced cutting, thus ensuring the integrity of the core sample.

[0050] Furthermore, refer to Figure 8 and Figure 10As shown, the cylinder base 201 includes a base cylinder 20100 and a limiting ring 20101 coaxially disposed on the outer periphery of the bottom of the base cylinder 20100. A flange is provided on the top of the base cylinder 20100 for easy connection with the drill rod 101. The limiting ring 20101 is provided with several through slots evenly distributed along the circumferential direction and extending vertically. The mounting plate 202 is slidably disposed in the through slots. To facilitate the installation and limiting of the mounting plate 202, the mounting plate 202 adopts a split structure, specifically including a main body 20200 and a limiting top plate 20201. The limiting top plate 20201 is detachably connected to the top of the main body 20200 by fasteners such as bolts. The limiting top plate 20201 can stop and cooperate with the limiting ring 20101.

[0051] Mounting rods are provided on both sides of the mounting plate 202. The mounting rods are slidably connected to the limiting ring 20101. The first elastic element 2021 is sleeved on the mounting rod and connected between the mounting plate 202 and the limiting ring 20101.

[0052] When the cutting wheel 204 encounters a relatively hard rock, as the cutting continues, the mounting plates 202 move upward and reset one by one. Since the top of the mounting plates 202 is exposed, the operator can observe and judge whether a relatively hard rock or other difficult-to-cut condition has been encountered during the sampling process. This allows the operator to control the drill 100, slow down the downward movement of the drill bit 200, and increase the rotation speed. By adjusting the parameters of the drill 100, the operator can assist in cutting the relatively hard rock until it is cut smoothly and efficiently. The process is convenient to use and the sampling process is highly controllable.

[0053] In a further embodiment, a guide groove 2022 is provided on the mounting piece 202. The guide groove 2022 extends along the bending direction of the mounting piece 202. The guide groove 2022 includes an arc-shaped segment and circular holes connected to both ends of the arc-shaped segment. The diameter of the circular holes is larger than the width of the arc-shaped segment. A limiting axial protrusion 2041 is provided at the axis of the cutting wheel 204. The limiting axial protrusion 2041 is slidably disposed in the guide groove 2022. The width of the limiting axial protrusion 2041 is adapted to the arc-shaped segment, and the length of the limiting axial protrusion 2041 is adapted to the diameter of the circular hole. This allows the cutting wheel 204 to rotate when the limiting axial protrusion 2041 is located in the arc-shaped segment and to rotate when the limiting axial protrusion 2041 is located in the circular hole. Specifically, the limiting axial protrusion 2041 is an oblong block.

[0054] The drill bit 200 also includes a transmission structure and a limiting assembly. The transmission structure is configured to convert the upward movement of the mounting plate 202 into the rotation of the cutting wheel 204 when the limiting shaft protrusion 2041 of the cutting wheel 204 is in the circular hole of the guide groove 2022, so as to increase the cutting speed of the cutting wheel 204.

[0055] The limiting component is configured such that the limiting shaft protrusion 2041 of the cutting wheel 204 tends to be within the arcuate section of the guide groove 2022 and prevents the mounting piece 202 from moving upward when the limiting shaft protrusion 2041 of the cutting wheel 204 is within the arcuate section of the guide groove 2022, and is configured to allow the mounting piece 202 to move upward when the limiting shaft protrusion 2041 of the cutting wheel 204 is within the circular hole of the guide groove 2022.

[0056] In the initial state, the cutting wheel 204 cannot rotate due to the limitation of the limiting component and the guide groove 2022, and thus rotates synchronously with the mounting plate 202 to cut the road surface. At this time, the mounting plate 202 cannot move upward. When the cutting wheel 204 encounters a harder stone, the stone is difficult to cut. At this time, the cutting wheel 204 will be blocked by the harder stone. Under the obstruction of the harder stone, the cutting wheel 204 overcomes the limitation of the limiting component and moves backward along the guide groove 2022 (the rotation direction of the drill bit 200 is forward, and vice versa) until it moves into the round hole at the end of the guide groove 2022. At this time, the cutting wheel 204 can rotate, and the mounting plate 202 can move upward.

[0057] Subsequently, the cutting wheel 204 overcomes the elastic force of the first elastic element 2021 under the obstruction and pushing of the harder stone, and drives the mounting plate 202 to move upward. The transmission structure converts the upward movement of the mounting plate 202 into the rotation of the cutting wheel 204. The cutting wheel 204 rotates around its own axis while rotating with the mounting plate 202. The cutting speed of the cutting wheel 204 on the harder stone increases, improving the cutting effect on the harder stone, so that the harder stone can be cut efficiently and smoothly.

[0058] In a further embodiment, the preferred transmission structure of the present invention includes protruding teeth 2024 disposed on the left and right sides of the mounting plate 202. Multiple protruding teeth 2024 are evenly disposed in the vertical direction. Cutting teeth are evenly disposed in the circumferential direction of the cutting wheel 204. The cutting teeth can mesh with the protruding teeth 2024.

[0059] When the cutting wheel 204 slides along the guide groove 2022 into the circular hole, the cutting teeth on the cutting wheel 204 approach the corresponding convex teeth 2024 on the mounting plate 202 located behind it. As the cutting wheel 204 moves upward, the cutting teeth on it gradually mesh with the convex teeth 2024. Under the meshing action of the convex teeth 2024 and the cutting teeth, the cutting wheel 204 rotates, and the direction of rotation matches the direction of rotation of the drill bit 200. In this way, the rotation speed of the drill bit 200 is superimposed with the rotation speed of the cutting wheel 204, and the cutting speed of the cutting wheel 204 on relatively hard stones is increased, thus enhancing the cutting effect.

[0060] In a further embodiment, the preferred limiting component of the present invention includes a locking block 203 and a stop bar 2011;

[0061] The bottom of the mounting plate 202 is provided with an insert groove, which runs through the bottom surface and the two circumferential sides of the mounting plate 202, thereby dividing the bottom of the mounting plate 202 into an inner plate and an outer plate. The inner plate is close to the axis of the cylinder seat 201, and the outer plate is away from the axis of the cylinder seat 201. The guide groove 2022 is provided on the outer plate, and the inner plate is provided with a mounting hole 2023. The mounting hole 2023 runs through the inside and outside (in the radial direction of the cylinder seat 201, the one closer to the axis of the cylinder seat 201 is the inside, and the one further away is the outside). The peripheral wall of the mounting hole 2023 includes two upper and lower opposing arc surfaces and an inclined surface connecting the two ends of the two arc surfaces. The arc surfaces and the inclined surfaces are tangent to each other and thus transition smoothly. In order to reduce stress concentration, the two inclined surfaces on the same side are connected by arcs.

[0062] The locking block 203 is disposed in the mounting hole 2023. The two ends of the locking block 203 slide in contact with the arc segment of the mounting hole 2023, so that the locking block 203 can rotate around the center of the mounting hole 2023. The two sides of the locking block 203 are provided with spring strips 2031, which abut against the two inclined surfaces on the corresponding sides of the mounting hole 2023. The spring strips 2031 can deform, and the spring strips 2031 tend to make the locking block 203 be in a vertical position. The limiting shaft protrusion 2041 at the center of the cutting wheel 204 is rotatably connected to the lower end of the locking block 203.

[0063] The stop bar 2011 is provided on the cylinder base 201, and the stop bar 2011 is slidably inserted into the mounting plate 202 with its lower end connected to the mounting hole 2023;

[0064] The locking block 203 has an internal cavity that extends through both the left and right sides of the locking block 203. The spring bar 2031 avoids the cavity of the locking block 203 to allow the stop bar 2011 to be inserted.

[0065] Furthermore, to ensure force balance, two spring bars 2031 are provided on each side of the locking block 203. The two spring bars 2031 located on the same side are respectively located on the front and rear sides of the inner cavity of the locking block 203 to avoid obstructing the inner cavity.

[0066] Furthermore, both ends of the arc-shaped surface of the mounting hole 2023 are provided with retaining strips 20231 to limit the rotation angle of the locking block 203. To prevent the locking block 203 from coming out of the inside of the mounting hole 2023, a limiting protrusion 20232 is provided on the side of the arc-shaped surface of the mounting hole 2023 near the axis of the cylinder seat 201, and a locking notch is provided on the upper and lower end faces of the locking block 203 near the axis of the cylinder seat 201. The locking notch is adapted to the limiting protrusion 20232 to prevent the locking block 203 from moving in the direction close to the axis of the cylinder seat 201.

[0067] In the initial state, the locking block 203 is in a vertical state due to the action of the spring bar 2031. At this time, the stop bar 2011 abuts against the upper end face of the locking block 203, preventing the mounting plate 202 from moving upward. Under the restriction of the locking block 203, the cutting wheel 204 is in the middle of the arc segment of the guide groove 2022, and the cutting wheel 204 cannot rotate.

[0068] The drilling rig 100 drives the drill bit 200 to rotate and feed downward through the drill rod 101. During the sampling process, if the road surface soil is easy to cut, the cutting wheel 204 rotates synchronously with the mounting plate 202 to cut and sample normally. The sample core is contained in the receiving cavity formed by the mounting plate 202.

[0069] During sampling, when the cutting wheel 204 encounters a hard stone, the stone is difficult to cut. At this time, the cutting wheel 204 is blocked by the hard stone and slides backward along the guide groove 2022 under the resistance of the hard stone. At the same time, it drives the locking block 203 to rotate along the mounting hole 2023 and compresses the spring strip 2031. When the cutting wheel 204 moves to the end of the guide groove 2022, the cutting wheel 204 can rotate around its own axis. At the same time, because the locking block 203 is tilted, the cavity inside the locking block 203 aligns with the stop rod 2011. That is, the stop rod 2011 releases its stop on the locking block 203, and the mounting plate 202 can move upward.

[0070] Subsequently, under the action of harder stones, the cutting wheel 204 drives the mounting plate 202 to move upward relative to the cylinder base 201, avoiding the hard stones that are difficult to cut, preventing excessive vibration caused by forced cutting, and ensuring the integrity of the sample core. At the same time, when the mounting plate 202 moves upward relative to the cylinder base 201, the cutting teeth on the corresponding cutting wheel 204 contact the protruding teeth 2024 on the mounting plate 202 located behind it. As the mounting plate 202 moves upward, the cutting teeth of the cutting wheel 204 and the protruding teeth 2024 mesh, causing the cutting wheel 204 to rotate around its own axis. The rotation of the cutting wheel 204 increases the speed at which the cutting wheel 204 cuts the hard stones, thus avoiding the hard stones while allowing the hard stones to be cut faster and more smoothly.

[0071] After the harder stones are cut, the mounting plate 202 returns to its original position downwards under the action of the first elastic element 2021. The stop bar 2011 gradually moves away from the locking block 203. Then, the locking block 203 and the cutting wheel 204 return to their original positions under the action of the elastic bar 2031. The stop bar 2011 re-abuts against the upper end face of the locking block 203, preventing the mounting plate 202 from moving upwards. The device then cuts the road surface normally until the core is extracted.

[0072] This invention also provides a rapid detection method for road surface compaction, using the aforementioned rapid detection device for road surface compaction, specifically including the following steps:

[0073] Step 1: Determine the road sampling point, move the drilling rig 100 to the vicinity of the sampling point, and position the drill bit 200 at the sampling point;

[0074] Step 2: Start the drilling rig 100. The drilling rig 100 drives the drill bit 200 to rotate and feed towards the road surface through the drill rod 101.

[0075] In this step, when the cutting wheel 204 encounters a harder rock, the cutting wheel 204 is pushed by the harder rock and drives the mounting plate 202 to move upward to avoid the hard rock. At the same time, the upward movement of the mounting plate 202 drives the cutting wheel 204 to rotate, which increases the cutting speed of the cutting wheel 204 on the harder rock, helps the harder rock to be cut efficiently and smoothly, and ensures the integrity of the sample.

[0076] Step 3: Cutting complete. Raise the drill bit 200 degrees and remove the core sample.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A rapid detection device for the compactness of a road surface, characterized in that, The application relates to a drilling machine and a drill bit. The drilling machine is provided with a drill rod, and is configured to drive the drill rod to rotate and axially move. The drill bit comprises a barrel, a plurality of mounting pieces and a plurality of cutting wheels. The barrel is coaxially arranged at the tail end of the drill rod. The plurality of mounting pieces are uniformly arranged at the lower end of the barrel along the circumferential direction of the barrel and extend downward. The plurality of mounting pieces are arc-shaped and are enclosed to form a containing cavity for containing a sample core.

2. The rapid detection device for road surface compactness according to claim 1, characterized in that, Each mounting piece is provided with a first elastic member between the mounting piece and the barrel.

3. The rapid detection device for road surface compactness according to claim 1, characterized in that, The first elastic member enables the mounting piece to have a tendency to be at the lower end limit position. The plurality of cutting wheels are correspondingly arranged with the plurality of mounting pieces. The cutting wheel is embedded at the bottom of the mounting piece and the axis of the cutting wheel is perpendicular to the axis of the barrel. The cutting wheel is configured to cut the road surface. The mounting piece is provided with a guide groove.

4. The rapid detection device for road surface compactness according to claim 3, characterized in that, The guide groove comprises an arc segment and a circular hole connected at both ends of the arc segment.

5. The rapid detection device for road surface compactness according to claim 3, characterized in that, The diameter of the circular hole is larger than the width of the arc segment.

6. The rapid detection device for road surface compactness according to claim 1, wherein The cutting wheel is provided with a limiting shaft convex at the center. The limiting shaft convex is slidingly arranged in the guide groove. The width of the limiting shaft convex is matched with the arc segment. The length of the limiting shaft convex is matched with the diameter of the circular hole. The drill bit further comprises a transmission structure and a limiting assembly. When the limiting shaft convex of the cutting wheel is in the circular hole of the guide groove, the transmission structure converts the upward movement of the mounting piece into the rotation of the cutting wheel to increase the cutting speed of the cutting wheel. The limiting assembly enables the limiting shaft convex of the cutting wheel to have a tendency to be in the arc segment of the guide groove and hinders the upward movement of the mounting piece when the limiting shaft convex of the cutting wheel is in the arc segment of the guide groove. When the limiting shaft convex of the cutting wheel is in the circular hole of the guide groove, the limiting assembly allows the upward movement of the mounting piece. The transmission structure comprises protruding teeth arranged on both sides of the mounting piece. The protruding teeth are uniformly arranged in the upward and downward directions. The cutting wheel is uniformly provided with cutting teeth in the circumferential direction. The cutting teeth can be engaged with the protruding teeth. The limiting assembly comprises a clamping block and a blocking rod. The bottom of the mounting piece is provided with an embedded groove. The embedded groove divides the bottom of the mounting piece into an inner plate and an outer plate. The guide groove is arranged on the outer plate. An installation hole is arranged on the inner plate. The peripheral wall surface of the installation hole comprises two circular arc surfaces and an inclined surface. The circular arc surfaces are tangent to the inclined surface. The clamping block is arranged in the installation hole. The two ends of the clamping block are in sliding contact with the circular arc segments of the installation hole. The clamping block can rotate around the center of the installation hole. The two sides of the clamping block are provided with elastic strips. The elastic strips are in contact with the two inclined surfaces of the corresponding side of the installation hole. The elastic strips can be deformed. The elastic strips enable the clamping block to have a tendency to be at the vertical position. The limiting shaft convex at the center of the cutting wheel is rotationally connected with the lower end of the clamping block. The blocking rod is arranged on the barrel. The blocking rod is slidingly inserted into the mounting piece and is connected with the installation hole at the lower end. The clamping block has a cavity. The cavity penetrates through the left and right sides of the clamping block. The elastic strips avoid the cavity of the clamping block to allow the blocking rod to be inserted. The two elastic strips on the same side are arranged on the front and rear sides of the inner cavity of the clamping block. The arc surfaces of the installation hole are provided with blocking strips at both ends. The barrel comprises a base barrel and a limiting ring coaxially arranged on the outer periphery of the bottom of the base barrel. The limiting ring is provided with a plurality of through grooves uniformly distributed along the circumferential direction and penetrating through the upper and lower sides. The mounting piece is slidingly arranged in the through groove.

7. The rapid detection device for road surface compactness according to claim 6, characterized in that, The mounting piece comprises a main body and a limiting top plate, the limiting top plate is detachably connected to the top of the main body, and the limiting top plate can be stopped by cooperating with the limiting ring.

8. The rapid detection device for road surface compactness according to claim 1, characterized in that, The first elastic member is a compression spring.

9. A method for rapid detection of the degree of compaction of a road surface, characterized in that, The rapid detection device for road surface compactness according to any one of claims 1-8 is used, and specifically comprises the following steps: Step 1, determining a road surface sampling point, moving a drilling machine to the vicinity of the sampling point, and positioning a drill bit to the sampling point; Step 2, starting the drilling machine, the drilling machine rotating and feeding the drill bit to the road surface through a drill rod; Step 3, cutting is completed, the drill bit is lifted, and a sample core is taken out.

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