A core taking device for highway pavement quality detection and an operating method thereof

Abstract

This invention belongs to the field of pavement core sampling and testing technology, specifically a core sampling device and operating method for highway pavement quality testing. The device includes a base, a fixed frame fixedly connected to the top of the base, a first motor fixedly connected to the top of the fixed frame, and a lead screw fixedly connected to the output end of the first motor through the fixed frame. This invention provides a core sampling device and operating method for highway pavement quality testing. After core drilling is completed, a first hydraulic cylinder drives the connecting ring to descend as a whole. Through mechanical transmission, the connecting shaft is pushed to an angular offset, causing the cutting block to extend stably and cut into the root of the core sample. Combined with the rotation of the drill cylinder, the cutting block performs circumferential cutting, achieving the separation of the core sample root from the subgrade base layer. This facilitates the removal of the core sample from the subgrade base layer, effectively avoiding adverse phenomena such as core sample layering, breakage, end-face defects, and structural damage caused by core sample retention in the borehole or forced extraction, thus improving the integrity and quality of the extracted core sample.

Description

Technical Field

[0001] This invention belongs to the field of pavement core sampling and testing technology, specifically a core sampling device and operating method for highway pavement quality testing. Background Technology

[0002] After the completion of highway construction, it is necessary to conduct sampling tests on key quality indicators such as the thickness, compaction degree, and bond strength of the pavement structural layers. Road core sampling is a core procedure for highway completion acceptance and subsequent maintenance testing. By drilling and forming pavement core samples with a core drill, the construction quality of each pavement structural layer can be directly determined, providing reliable data support for project quality assessment. Currently, the industry generally uses vertical pavement core drills to complete the core drilling operation. The high-speed rotating drill cylinder cuts into the pavement and subgrade to obtain columnar core samples for subsequent physical and chemical testing.

[0003] However, after the core sample is extracted, the root of the core sample tends to remain fixed to the subgrade. Directly lifting the drill barrel can easily cause the core sample to remain inside the subgrade borehole, resulting in a low core extraction success rate. Secondly, if the core sample is directly pulled out by the drill barrel, it is easy for the core sample to stick and become stuck to the inner wall of the drill barrel, which can cause problems with unloading. Forced extraction can easily damage the core sample, making it impossible to guarantee the integrity of the core sample and affecting the accuracy of the test. In addition, traditional core extraction operations rely solely on external spraying to cool the drill barrel. The drill barrel is tightly attached to the road surface and subgrade to form a sealing structure. After the coolant is sprayed onto the road surface, it tends to spread to the surroundings and is difficult to effectively penetrate into the cutting area of ​​the drill barrel, resulting in a limited cooling effect.

[0004] Therefore, the present invention provides a core sampling device and operating method for highway pavement quality testing. Summary of the Invention

[0005] To address the shortcomings of existing technologies and solve the problem that after drilling and sampling, the core sample root tends to remain fixed to the subgrade base, and directly lifting the drill barrel can easily cause the core sample to remain inside the subgrade borehole, resulting in a low core sampling success rate. Secondly, if the core sample is directly carried out by the drill barrel, it is prone to adhesion and jamming to the inner wall of the drill barrel, leading to difficulties in unloading, core sample damage and breakage, and inability to guarantee core sample integrity, thus affecting the accuracy of testing. In addition, traditional core sampling operations rely solely on external spraying to cool the drill barrel, which forms a sealing structure with the road surface and subgrade. After the coolant is sprayed onto the road surface, it tends to diffuse in all directions and has difficulty effectively penetrating the cutting area of ​​the drill barrel, resulting in limited cooling effect. Therefore, this invention proposes a core sampling device and operating method for highway pavement quality testing.

[0006] The technical solution adopted by the present invention to solve its technical problem is as follows: A core sampling device for highway pavement quality testing, comprising a base, a fixed frame fixedly connected to the top of the base, a first motor fixedly connected to the top of the fixed frame, the output end of the first motor passing through the fixed frame and fixedly connected to a lead screw, the end of the lead screw being rotatably connected to the base, a slider connected to the outer wall of the lead screw via a lead screw and nut pair, the slider being slidably connected to the fixed frame, a side plate fixedly connected to one side of the slider, the side plate being slidably connected to the fixed frame, a support plate fixedly connected to one side of the side plate, a second motor fixedly connected to the top of the support plate, a first rotating shaft fixedly connected to the output end of the second motor, a second rotating shaft slidably engaged with the outer wall of the first rotating shaft, the two being able to slide relative to each other axially and synchronously transmit power in the circumferential direction, a drill cylinder fixedly connected to the bottom of the second rotating shaft, and a cutting assembly being provided inside the drill cylinder.

[0007] Preferably, a sleeve is fixedly connected to the bottom of the support plate, a fixing ring is fixedly connected to the bottom of the sleeve, a support ring is rotatably connected to the outer wall of the drill barrel, and a sliding plate is slidably connected to the outer wall of the support ring. The sliding plate is annular and fixedly connected to the inner wall of the fixing ring.

[0008] Preferably, the cutting assembly includes two first mounting slots, which are symmetrically opened on the inner wall of the drill barrel. A cutting block is slidably connected to the bottom of the inner wall of each of the two first mounting slots. The bottom of the cutting block is set as an inclined surface. A second mounting slot is opened inside the cutting block. A second spring is installed inside the second mounting slot. One end of the second spring is fixedly connected to the cutting block, and the other end of the second spring is fixedly connected to the drill barrel. A driving unit is provided on the top of the support ring.

[0009] Preferably, the drive unit includes two first hydraulic cylinders, which are symmetrically fixedly installed on the top of the support ring. The output ends of the two first hydraulic cylinders are jointly fixedly connected to a connecting ring. A rotating ring is rotatably connected to the bottom of the connecting ring. Two connecting rods are symmetrically fixedly connected to the bottom of the rotating ring. The connecting rods are slidably connected to the drill barrel, and the bottom of the connecting rods extends through the interior of the first mounting groove. A connecting shaft is rotatably connected between the connecting rods and the cutting block.

[0010] Preferably, two mounting plates are symmetrically fixedly connected to the inner wall of the fixed ring. The inner walls of the two mounting plates are rotatably connected to a third rotating shaft. The outer walls of the two third rotating shafts are rotatably connected to a cam. The cam is located below the support ring. Several sliding shafts are fixedly installed in a circular array inside the support ring. Several sliding shafts are slidably connected to the slide plate. The outer walls of several sliding shafts are fitted with a first spring. The top of the first spring is fixedly connected to the slide plate, and the bottom of the first spring is fixedly connected to the support ring. An adjustment component is provided inside the cam.

[0011] Preferably, the adjustment component includes a third mounting groove, which is opened inside the cam. A locking block is slidably connected to the inner wall of the third mounting groove. A third spring is fixedly connected to the bottom of the locking block. The bottom of the third spring is fixedly connected to the cam. The cross-section of the locking block is a right trapezoid. The two locking blocks are centrally symmetrically arranged. A slot is opened on the outer wall of the third rotating shaft. The locking block fits into the inner wall of the slot. A linkage unit is provided on the outer wall of the first rotating shaft.

[0012] Preferably, the linkage unit includes a first bevel gear, which is fixedly mounted on the outer wall of the first rotating shaft. The inner walls of the two mounting plates are rotatably connected to a fourth rotating shaft. One end of each of the two fourth rotating shafts is fixedly connected to a second bevel gear, and the two second bevel gears mesh with the first bevel gear. The other end of each of the two fourth rotating shafts is fixedly connected to a first synchronous pulley, and the ends of each of the two third rotating shafts are fixedly connected to a second synchronous pulley. The first synchronous pulley and the second synchronous pulley are connected by a synchronous belt drive.

[0013] Preferably, the bottoms of the two mounting plates are fixedly connected to an annular pipe, and a plurality of nozzles are fixedly installed in an annular array on the inner wall of the annular pipe. A water tank is fixedly connected to the top of the base, and a water pump is fixedly connected to the top of the water tank. A water pump is fixedly connected to the input end of the water pump, and the end of the water pump extends into the interior of the water tank. A water outlet pipe is fixedly connected to the output end of the water pump, and the end of the water outlet pipe extends into the interior of the annular pipe.

[0014] Preferably, the inner wall of the base is fixedly connected to two brackets, and the top of each of the two brackets is fixedly connected to a second hydraulic cylinder. The output ends of the two second hydraulic cylinders are jointly fixedly connected to a flow-limiting ring. The top of the flow-limiting ring is set as an annular inclined surface, and the inner diameter of the flow-limiting ring is larger than the outer diameter of the drill barrel.

[0015] A method for operating a core sampling device for highway pavement quality testing, applicable to the aforementioned core sampling device for highway pavement quality testing, comprising the following steps:

[0016] S1: Move the base to the road surface to be sampled, start the first motor to control the drill barrel to move downward, and start the second motor to control the drill barrel to rotate, drilling into the roadbed;

[0017] S2: Start the water pump to draw the coolant into the annular pipe, and spray the coolant out through several nozzles to cool the surface of the drill barrel.

[0018] S3: Start the first hydraulic cylinder to control the cutting block to extend, and coordinate with the rotation of the drill barrel to drive the cutting block to cut circumferentially;

[0019] S4: Control the drill barrel after core extraction to move out of the ground, start the second motor to control the drill barrel to vibrate continuously downward, and shake off the core sample that is stuck in the drill barrel.

[0020] The beneficial effects of this invention are as follows:

[0021] 1. The core sampling device and operating method for highway pavement quality testing described in this invention, after the core drilling operation is completed, uses a first hydraulic cylinder to drive the connecting ring and connecting rod to move downward as a whole. Through mechanical transmission, the connecting shaft is pushed to cause an angular offset, so that the cutting block extends stably and cuts into the root of the core sample. With the rotation of the drill barrel, the cutting block is driven to cut circumferentially, realizing the separation of the root of the core sample from the subgrade base layer. This facilitates the removal of the core sample from the subgrade base layer and effectively avoids adverse phenomena such as core sample layering, breakage, end face defects, and structural damage caused by core sample retention in the drill hole and forced extraction. It greatly improves the integrity and forming quality of the core sample.

[0022] 2. The core sampling device and operating method for highway pavement quality testing described in this invention utilizes a second motor to control the forward rotation of a first rotating shaft, enabling cutting of the roadbed. The second motor also controls the first rotating shaft to rotate in reverse, allowing a cam to maintain rotation through the cooperation of a locking block and a locking groove. This cam lifts the support ring and the drill cylinder. When the cam's protruding end rotates away from the support ring, the drill cylinder moves downward and vibrates under the action of a first spring and its own weight. This reciprocating mechanical vibration utilizes inertia to quickly peel off and shake off the core sample adhering to the inner wall of the drill cylinder, eliminating the need for manual knocking or prying for unloading. This completely avoids core sample chipping, breakage, and structural damage caused by manual unloading, significantly improving unloading efficiency and core sample integrity, and ensuring the accuracy and reliability of pavement quality testing data.

[0023] 3. The core sampling device and operating method for highway pavement quality testing described in this invention achieves all-round and uniform spraying of cooling medium through an annular pipe and array nozzles, which can fully cover and cool the outer wall of the drill barrel. The flow-limiting ring is driven by a second hydraulic cylinder to move down and fit tightly against the road surface. The inclined enclosure structure of the flow-limiting ring effectively gathers and constrains the sprayed coolant, preventing the coolant from spreading to the surroundings, extending the contact time between the coolant and the drill barrel, and achieving a better cooling effect. Moreover, the coolant trapped by the enclosure can fully penetrate into the cutting gap between the drill barrel and the road surface, and can continuously cool the working section of the drill barrel that extends deep into the roadbed, effectively solving the problems of insufficient cooling and failure of deep cooling in traditional external spraying. Attached Figure Description

[0024] The invention will now be further described with reference to the accompanying drawings.

[0025] Figure 1 This is a perspective view of the base and drill barrel of the present invention in use;

[0026] Figure 2 This is a perspective view of the support plate and drill barrel of the present invention in use;

[0027] Figure 3 This is an exploded view of the slider and drill barrel of the present invention in use;

[0028] Figure 4 This is an exploded view of the connecting ring and support ring of the present invention in use.

[0029] Figure 5 This is a cross-sectional view of the drill barrel and retaining ring used in conjunction with the present invention;

[0030] Figure 6 This is an exploded view of the cam of the present invention in use with the third rotating shaft;

[0031] Figure 7 This is a perspective view of the drill barrel and flow-limiting ring used in conjunction with the present invention;

[0032] Figure 8 This is an exploded view of the connecting rod and connecting ring of the present invention in use;

[0033] Figure 9 This is an exploded view of the support ring and mounting plate of the present invention in use.

[0034] Figure 10 This is the present invention. Figure 5 Enlarged view of point A in the middle;

[0035] Figure 11 This is the present invention. Figure 5 Enlarged view of point B in the middle.

[0036] In the diagram: 1. Base; 2. Fixing frame; 3. First motor; 4. Lead screw; 5. Slider; 6. Side plate; 7. Support plate; 8. Second motor; 9. First rotating shaft; 10. Second rotating shaft; 11. Drill barrel; 12. Sleeve; 13. Fixing ring; 14. Slide plate; 15. Support ring; 16. Sliding shaft; 17. First spring; 18. First mounting groove; 19. Cutting block; 20. Second mounting groove; 21. Second spring; 22. First hydraulic cylinder; 23. Connecting ring; 24. Rotating ring 25. Connecting rod; 26. Connecting shaft; 27. Mounting plate; 28. Third rotating shaft; 29. ​​Cam; 30. Third mounting groove; 31. Third spring; 32. Locking block; 33. Locking groove; 34. First bevel gear; 35. Fourth rotating shaft; 36. Second bevel gear; 37. First synchronous pulley; 38. Second synchronous pulley; 39. Synchronous belt; 40. Annular pipe; 41. Nozzle; 42. Water tank; 43. Water pump; 44. Bracket; 45. Second hydraulic cylinder; 46. Flow limiting ring. Detailed Implementation

[0037] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0038] like Figures 1 to 11 As shown, the present invention provides a technical solution: a core sampling device for highway pavement quality testing, comprising a base 1, a fixing frame 2 fixedly connected to the top of the base 1, a first motor 3 fixedly connected to the top of the fixing frame 2, the output end of the first motor 3 passing through the fixing frame 2 and fixedly connected to a lead screw 4, the end of the lead screw 4 being rotatably connected to the base 1, a slider 5 connected to the outer wall of the lead screw 4 via a lead screw and nut pair, the slider 5 being slidably connected to the fixing frame 2, a side plate 6 fixedly connected to one side of the slider 5, the side plate 6 being slidably connected to the fixing frame 2, a support plate 7 fixedly connected to one side of the side plate 6, and the top of the support plate 7 being... A second motor 8 is fixedly connected, and a first rotating shaft 9 is fixedly connected to the output end of the second motor 8. A second rotating shaft 10 is slidably engaged with the outer wall of the first rotating shaft 9. The two can slide relative to each other axially and transmit synchronously in the circumferential direction. A drill cylinder 11 is fixedly connected to the bottom of the second rotating shaft 10. A cutting assembly is provided inside the drill cylinder 11. A sleeve 12 is fixedly connected to the bottom of the support plate 7. A fixing ring 13 is fixedly connected to the bottom of the sleeve 12. A support ring 15 is rotatably connected to the outer wall of the drill cylinder 11. A sliding plate 14 is slidably connected to the outer wall of the support ring 15. The sliding plate 14 is set as an annular shape and is fixedly connected to the inner wall of the fixing ring 13.

[0039] Using the above technical solution, the base 1 is moved to the road surface to be sampled, the first motor 3 is started, which drives the lead screw 4 to rotate, causing the slider 5 to move downward, which in turn drives the side plate 6 and the support plate 7 to move downward, causing the second motor 8 and the drill cylinder 11 to move downward. When the drill cylinder 11 contacts the road surface, the second motor 8 is started, which drives the first rotating shaft 9 to rotate, which in turn drives the second rotating shaft 10 to rotate, which in turn drives the drill cylinder 11 to rotate. As the drill cylinder 11 rotates, it moves downward, which allows it to drill into the roadbed. When the drill cylinder 11 rotates, the support ring 15 supports the drill cylinder 11, which improves the stability of the drill cylinder 11 rotation. After the drill cylinder 11 has finished drilling, the core sample root is cut off from the roadbed base layer by the cutting assembly, which makes it easier to remove the core sample from the roadbed base layer.

[0040] Specifically, the cutting assembly includes two first mounting slots 18, which are symmetrically opened on the inner wall of the drill barrel 11. A cutting block 19 is slidably connected to the bottom of the inner wall of each of the two first mounting slots 18. The bottom of the cutting block 19 is set as an inclined surface. A second mounting slot 20 is opened inside the cutting block 19. A second spring 21 is set inside the second mounting slot 20. One end of the second spring 21 is fixedly connected to the cutting block 19, and the other end of the second spring 21 is fixedly connected to the drill barrel 11. A drive unit is set on the top of the support ring 15. The drive unit includes two first hydraulic cylinders 22, which are symmetrically fixedly installed on the top of the support ring 15. The output ends of the two first hydraulic cylinders 22 are jointly fixedly connected to a connecting ring 23. A rotating ring 24 is rotatably connected to the bottom of the connecting ring 23. Two connecting rods 25 are symmetrically fixedly connected to the bottom of the rotating ring 24. The connecting rods 25 are slidably connected to the drill barrel 11, and the bottom of the connecting rods 25 extends into the interior of the first mounting slot 18. A connecting shaft 26 is rotatably connected between the connecting rods 25 and the cutting block 19.

[0041] Through the above technical solution, while the drill barrel 11 rotates, it drives the two connecting rods 25 to rotate, causing the rotating ring 24 to rotate at the bottom of the connecting ring 23. After the drill barrel 11 finishes drilling, the two first hydraulic cylinders 22 control the connecting ring 23 to move downward, driving the rotating ring 24 to move downward, causing the two connecting rods 25 to move downward. After the connecting rods 25 move downward, they push the connecting shaft 26 to shift, causing the cutting block 19 to extend and insert into the core sample. The second motor 8 controls the drill barrel 11 to rotate, driving the cutting block 19 to rotate. The rotating cutting block 19 can cut off the root of the core sample, making it easy to remove the core sample from the subgrade base. After the cutting block 19 extends out of the first mounting groove 18, it pulls open the second spring 21. After the core is removed, the two first hydraulic cylinders 22 control the connecting ring 23 and the connecting rod 25 to move upward and reset. Under the action of the second spring 21, the cutting block 19 can be put back into the first mounting groove 18, making it easy to cut the next core sample.

[0042] Specifically, two mounting plates 27 are symmetrically fixedly connected to the inner wall of the fixed ring 13. A third rotating shaft 28 is rotatably connected to the inner wall of each mounting plate 27. A cam 29 is rotatably connected to the outer wall of each of the two third rotating shafts 28. The cam 29 is located below the support ring 15. Several sliding shafts 16 are fixedly installed in a circular array inside the support ring 15. Each sliding shaft 16 is slidably connected to the slide plate 14. A first spring 17 is sleeved on the outer wall of each sliding shaft 16. The top of the first spring 17 is fixedly connected to the slide plate 14, and the bottom of the first spring 17 is fixedly connected to the support ring 15. An adjustment component is provided inside the cam 29. The adjustment component includes a third mounting groove 30, which is located inside the cam 29. A locking block 32 is slidably connected to the inner wall of the third mounting groove 30. A third spring 31 is fixedly connected to the bottom of the locking block 32. The bottom of the three springs 31 is fixedly connected to the cam 29. The cross-section of the locking block 32 is a right trapezoid. The two locking blocks 32 are centrally symmetrically arranged. The outer wall of the third rotating shaft 28 is provided with a locking groove 33. The locking block 32 fits against the inner wall of the locking groove 33. The outer wall of the first rotating shaft 9 is provided with a linkage unit. The linkage unit includes a first bevel gear 34, which is fixedly installed on the outer wall of the first rotating shaft 9. The inner walls of the two mounting plates 27 are rotatably connected to a fourth rotating shaft 35. One end of each of the two fourth rotating shafts 35 is fixedly connected to a second bevel gear 36. Both second bevel gears 36 mesh with the first bevel gear 34. The other end of each of the two fourth rotating shafts 35 is fixedly connected to a first synchronous pulley 37. The ends of the two third rotating shafts 28 are fixedly connected to a second synchronous pulley 38. The first synchronous pulley 37 and the second synchronous pulley 38 are connected by a synchronous belt 39.

[0043] Through the above technical solution, when core sampling is performed on the road surface, the second motor 8 controls the first rotating shaft 9 to rotate forward. Simultaneously, the rotation of the first rotating shaft 9 drives the first bevel gear 34 to rotate, causing the two second bevel gears 36 to rotate in opposite directions. This, in turn, drives the two fourth rotating shafts 35 to rotate in opposite directions, causing the two first synchronous pulleys 37 to rotate. Under the transmission of the synchronous belt 39, the two third rotating shafts 28 rotate in opposite directions, causing the two cams 29 to rotate in opposite directions. When the protruding end of the cam 29 rotates to a position close to the support ring 15, it is pressed by the support ring 15 and stops rotating. At this time, as the two third rotating shafts 28 continue to rotate, and because the inclined surfaces of the two locking blocks 32 are centrally symmetrically distributed, the inner walls of their two locking grooves 33 simultaneously press against the inclined surfaces of the locking blocks 32. Under the pressure of the locking grooves 33, the locking blocks 32 move into the third mounting groove 30, compressing the third spring 31. Thus, when the second motor 8 controls the drill barrel 11 to drill into the road surface, the support ring 15 remains stationary. After the core sample inside the drill barrel 11 is cut, the first motor... 3. Control the drill barrel 11 to move upward, so that the drill barrel 11 moves out of the roadbed base layer. The second motor 8 controls the first rotating shaft 9 to reverse, which in turn causes the third rotating shaft 28 to reverse, driving the cam 29 to reverse. When the protruding end of the cam 29 rotates again to a position close to the support ring 15, under the action of the third spring 31, the locking block 32 is inserted into the locking groove 33. The inner wall of the locking groove 33 abuts against the straight surface on the locking block 32. Thus, under the limit of the locking block 32, the cam 29 continues to rotate, pushing the support ring 15 to move upward, driving the drill barrel 11 and the second rotating shaft 10 to move upward. While the support ring 15 moves upward, it presses the first spring 17. When the protruding end of the cam 29 rotates to a position away from the support ring 15, under the action of the first spring 17 and the weight of the drill barrel 11 itself, the drill barrel 11 moves downward and vibrates. This process repeats. When the second motor 8 controls the first rotating shaft 9 to reverse, the drill barrel 11 can continuously vibrate downward. Through the action of inertia, it is easy to shake off the core sample that is stuck in the drill barrel 11.

[0044] Specifically, the bottom of the two mounting plates 27 is fixedly connected to an annular pipe 40. The inner wall of the annular pipe 40 is fixedly installed with several nozzles 41 in an annular array. The top of the base 1 is fixedly connected to a water tank 42. The top of the water tank 42 is fixedly connected to a water pump 43. The input end of the water pump 43 is fixedly connected to a water pumping pipe. The end of the water pumping pipe extends into the interior of the water tank 42. The output end of the water pump 43 is fixedly connected to an outlet pipe. The end of the outlet pipe extends into the interior of the annular pipe 40. The inner wall of the base 1 is fixedly connected to two brackets 44. The top of each bracket 44 is fixedly connected to a second hydraulic cylinder 45. The output ends of the two second hydraulic cylinders 45 are fixedly connected to a flow-limiting ring 46. The top of the flow-limiting ring 46 is set as an annular inclined surface. The inner diameter of the flow-limiting ring 46 is larger than the outer diameter of the drill barrel 11, and the flow-limiting ring 46 is located below the drill barrel 11.

[0045] Through the above technical solution, coolant is filled into the water tank 42, and the water pump 43 is started to draw the coolant from the water tank 42 into the annular pipe 40. The coolant is sprayed out through several nozzles 41 to uniformly spray and cool the surface of the drill barrel 11. At the same time, the flow-limiting ring 46 is moved downward by two second hydraulic cylinders 45 so that the bottom of the flow-limiting ring 46 is pressed against the road surface. At this time, the coolant that slides down the surface of the drill barrel 11 accumulates on the inclined surface of the top of the flow-limiting ring 46. The flow-limiting ring 46 blocks the coolant from spreading to the surroundings, prolonging the contact time between the coolant and the drill barrel 11, resulting in a better cooling effect. Moreover, the coolant trapped by the flow-limiting ring can fully penetrate into the cutting gap between the drill barrel 11 and the road surface, which can continuously cool the working section of the drill barrel 11 that extends deep into the roadbed, effectively solving the problems of insufficient cooling and failure of deep cooling in traditional external spraying.

[0046] A method for operating a core sampling device for highway pavement quality testing, applicable to the aforementioned core sampling device for highway pavement quality testing, comprising the following steps:

[0047] S1: Move the base 1 to the road surface to be sampled, start the first motor 3 to control the drill barrel 11 to move downward, and start the second motor 8 to control the drill barrel 11 to rotate and drill into the roadbed;

[0048] S2: Start the water pump 43 to draw the coolant into the annular pipe 40, and spray the coolant out through several nozzles 41 to spray the surface of the drill barrel 11 to cool it down.

[0049] S3: Start the first hydraulic cylinder 22 to control the cutting block 19 to extend, and coordinate with the rotation of the drill barrel 11 to drive the cutting block 19 to cut in the circumferential direction;

[0050] S4: Control the drill barrel 11 after core extraction to move out of the ground, start the second motor 8 to control the drill barrel 11 to vibrate continuously downward, and shake off the core sample that is stuck in the drill barrel 11.

[0051] In use, move the base 1 to the road surface to be sampled, start the first motor 3, which drives the lead screw 4 to rotate, causing the slider 5 to move downwards, which in turn drives the side plate 6 and support plate 7 to move downwards, causing the second motor 8 and drill barrel 11 to move downwards. When the drill barrel 11 contacts the road surface, the second motor 8 controls the first rotating shaft 9 to rotate forward. Simultaneously, the rotation of the first rotating shaft 9 drives the first bevel gear 34 to rotate, causing the two second bevel gears 36 to rotate, which in turn drives the two fourth rotating shafts 35 to rotate, causing the two first synchronous pulleys 37 to rotate. Under the transmission of the synchronous belt 39, the two third rotating shafts 28 are driven to rotate, causing the two cams 29 to rotate. When the protruding end of the cam 29 rotates to a position close to the support ring 15, it is pressed by the support ring 15 and stops rotating. At this time, with the third rotating shaft 28... As the rotation continues, the inner wall of the slot 33 presses against the inclined surface of the block 32 on one side. Under the pressure of the slot 33, the block 32 moves into the third mounting groove 30, compressing the third spring 31. Thus, when the second motor 8 controls the drill barrel 11 to drill into the road surface, the support ring 15 remains stationary. As the drill barrel 11 rotates, the support ring 15 supports the drill barrel 11, improving the stability of the drill barrel 11's rotation. Coolant is added to the water tank 42, and the water pump 43 is started to draw the coolant from the water tank 42 into the annular pipe 40. The coolant is sprayed out through several nozzles 41, uniformly spraying and cooling the surface of the drill barrel 11. At the same time, the two second hydraulic cylinders 45 control the flow-limiting ring 46 to move downward, so that the bottom of the flow-limiting ring 46 presses against the road surface. At this time, the coolant sliding down the surface of the drill barrel 11... Coolant accumulates on the inclined surface at the top of the flow-limiting ring 46. The flow-limiting ring 46 prevents the coolant from spreading outwards, extending the contact time between the coolant and the drill barrel 11, resulting in better cooling. Furthermore, the coolant trapped within the flow-limiting ring 46 can fully penetrate the cutting gap between the drill barrel 11 and the road surface, providing continuous cooling to the working section of the drill barrel 11 extending deep into the roadbed. This effectively solves the problems of insufficient cooling and failure of traditional external spray cooling. As the drill barrel 11 rotates, it drives the two connecting rods 25 to rotate, causing the rotating ring 24 to rotate at the bottom of the connecting ring 23. After the drill barrel 11 completes drilling, the two first hydraulic cylinders 22 control the connecting ring 23 to move downwards, driving the rotating ring 24 downwards, which in turn moves the two connecting rods 25 downwards. After moving downwards, the connecting shaft 26 is offset, causing the cutting block 19 to extend and insert into the core sample. The second motor 8 controls the drill barrel 11 to rotate, which in turn drives the cutting block 19 to rotate. The rotating cutting block 19 can cut off the root of the core sample, making it easier to remove the core sample from the subgrade base. After cutting off the core sample in the drill barrel 11, the first motor 3 controls the drill barrel 11 to move upwards, causing the drill barrel 11 to move out of the subgrade base. The second motor 8 controls the first rotating shaft 9 to reverse, which in turn causes the third rotating shaft 28 to reverse, driving the cam 29 to reverse. When the protruding end of the cam 29 rotates again to a position close to the support ring 15, the inner wall of the slot 33 abuts against the straight surface on the other side of the locking block 32. Thus, under the limitation of the locking block 32, the cam 29 continues to rotate, pushing the support ring 15 to move upwards.The drill barrel 11 and the second rotating shaft 10 move upwards, and the support ring 15 moves upwards while pressing the first spring 17. When the protruding end of the cam 29 rotates to a position away from the support ring 15, the drill barrel 11 moves downwards and vibrates under the action of the first spring 17 and its own weight. This process repeats. When the second motor 8 controls the first rotating shaft 9 to reverse, the drill barrel 11 continues to vibrate downwards. Through inertia, the core sample adhering to the drill barrel 11 is easily shaken off. After core removal is completed, the connecting ring 23 and the connecting rod 25 are moved upwards and reset by the two first hydraulic cylinders 22. Under the action of the second spring 21, the cutting block 19 can be retracted into the first mounting groove 18, facilitating the cutting of the next core sample.

[0052] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0053] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0054] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A core sampling device for highway pavement quality testing, characterized in that: Includes a base (1), a fixed frame (2) is fixedly connected to the top of the base (1), a first motor (3) is fixedly connected to the top of the fixed frame (2), the output end of the first motor (3) passes through the fixed frame (2) and is fixedly connected to a lead screw (4), the end of the lead screw (4) is rotatably connected to the base (1), the outer wall of the lead screw (4) is connected to a slider (5) through a lead screw nut pair, the slider (5) is slidably connected to the fixed frame (2), and a side plate (6) is fixedly connected to one side of the slider (5). The side plate (6) is slidably connected to the fixed frame (2). A support plate (7) is fixedly connected to one side of the side plate (6). A second motor (8) is fixedly connected to the top of the support plate (7). A first rotating shaft (9) is fixedly connected to the output end of the second motor (8). A second rotating shaft (10) is slidably engaged with the outer wall of the first rotating shaft (9). The two can slide relative to each other axially and transmit synchronously in the circumferential direction. A drill cylinder (11) is fixedly connected to the bottom of the second rotating shaft (10). A cutting assembly is provided inside the drill cylinder (11).

2. The core sampling device for highway pavement quality testing according to claim 1, characterized in that: A sleeve (12) is fixedly connected to the bottom of the support plate (7), and a fixing ring (13) is fixedly connected to the bottom of the sleeve (12). A support ring (15) is rotatably connected to the outer wall of the drill barrel (11), and a sliding plate (14) is slidably connected to the outer wall of the support ring (15). The sliding plate (14) is set as an annular shape and is fixedly connected to the inner wall of the fixing ring (13).

3. The core sampling device for highway pavement quality testing according to claim 2, characterized in that: The cutting assembly includes two first mounting slots (18), which are symmetrically opened on the inner wall of the drill barrel (11). A cutting block (19) is slidably connected to the bottom of the inner wall of each of the two first mounting slots (18). The bottom of the cutting block (19) is set as an inclined surface. A second mounting slot (20) is opened inside the cutting block (19). A second spring (21) is provided inside the second mounting slot (20). One end of the second spring (21) is fixedly connected to the cutting block (19), and the other end of the second spring (21) is fixedly connected to the drill barrel (11). A driving unit is provided on the top of the support ring (15).

4. The core sampling device for highway pavement quality testing according to claim 3, characterized in that: The drive unit includes two first hydraulic cylinders (22), which are symmetrically fixedly installed on the top of the support ring (15). The output ends of the two first hydraulic cylinders (22) are fixedly connected to a connecting ring (23). A rotating ring (24) is rotatably connected to the bottom of the connecting ring (23). Two connecting rods (25) are symmetrically fixedly connected to the bottom of the rotating ring (24). The connecting rods (25) are slidably connected to the drill barrel (11), and the bottom of the connecting rods (25) extends through the interior of the first mounting groove (18). A connecting shaft (26) is rotatably connected between the connecting rods (25) and the cutting block (19).

5. A core sampling device for highway pavement quality testing according to claim 4, characterized in that: The inner wall of the fixed ring (13) is symmetrically fixedly connected to two mounting plates (27). The inner walls of the two mounting plates (27) are rotatably connected to a third rotating shaft (28). The outer walls of the two third rotating shafts (28) are rotatably connected to a cam (29). The cam (29) is located below the support ring (15). The support ring (15) has several sliding shafts (16) fixedly installed in a ring array inside. The several sliding shafts (16) are slidably connected to the slide plate (14). The outer walls of the several sliding shafts (16) are fitted with a first spring (17). The top of the first spring (17) is fixedly connected to the slide plate (14). The bottom of the first spring (17) is fixedly connected to the support ring (15). The cam (29) is provided with an adjustment component inside.

6. A core sampling device for highway pavement quality testing according to claim 5, characterized in that: The adjustment component includes a third mounting groove (30), which is located inside the cam (29). A locking block (32) is slidably connected to the inner wall of the third mounting groove (30). A third spring (31) is fixedly connected to the bottom of the locking block (32). The bottom of the third spring (31) is fixedly connected to the cam (29). The cross-section of the locking block (32) is a right trapezoid. The two locking blocks (32) are centrally symmetrically arranged. A slot (33) is provided on the outer wall of the third rotating shaft (28). The locking block (32) fits against the inner wall of the slot (33). A linkage unit is provided on the outer wall of the first rotating shaft (9).

7. A core sampling device for highway pavement quality testing according to claim 6, characterized in that: The linkage unit includes a first bevel gear (34), which is fixedly installed on the outer wall of the first rotating shaft (9). The inner walls of the two mounting plates (27) are rotatably connected to a fourth rotating shaft (35). One end of each of the two fourth rotating shafts (35) is fixedly connected to a second bevel gear (36), which meshes with the first bevel gear (34). The other end of each of the two fourth rotating shafts (35) is fixedly connected to a first synchronous pulley (37), and the ends of each of the two third rotating shafts (28) are fixedly connected to a second synchronous pulley (38). The first synchronous pulley (37) and the second synchronous pulley (38) are connected by a synchronous belt (39).

8. A core sampling device for highway pavement quality testing according to claim 7, characterized in that: The bottom of the two mounting plates (27) is fixedly connected to an annular pipe (40). The inner wall of the annular pipe (40) is fixedly installed with several nozzles (41) in an annular array. The top of the base (1) is fixedly connected to a water tank (42). The top of the water tank (42) is fixedly connected to a water pump (43). The input end of the water pump (43) is fixedly connected to a water pumping pipe. The end of the water pumping pipe extends into the interior of the water tank (42). The output end of the water pump (43) is fixedly connected to a water outlet pipe. The end of the water outlet pipe extends into the interior of the annular pipe (40).

9. A core sampling device for highway pavement quality testing according to claim 8, characterized in that: The inner wall of the base (1) is fixedly connected to two brackets (44), and the top of each of the two brackets (44) is fixedly connected to a second hydraulic cylinder (45). The output ends of the two second hydraulic cylinders (45) are fixedly connected to a flow-limiting ring (46). The top of the flow-limiting ring (46) is set as an annular inclined surface, and the inner diameter of the flow-limiting ring (46) is larger than the outer diameter of the drill barrel (11).

10. A method for operating a core sampling device for highway pavement quality testing, the method being applicable to the core sampling device for highway pavement quality testing as described in claim 9, characterized in that: The steps for this operation are as follows: S1: Move the base (1) to the road surface to be sampled, start the first motor (3) to control the drill barrel (11) to move downward, and start the second motor (8) to control the drill barrel (11) to rotate and drill into the roadbed; S2: Start the water pump (43) to draw the coolant into the annular pipe (40) and spray the coolant out through several nozzles (41) to cool the surface of the drill barrel (11); S3: Start the first hydraulic cylinder (22) to control the cutting block (19) to extend, and in conjunction with the rotation of the drill barrel (11), drive the cutting block (19) to perform circumferential cutting; S4: Control the drill barrel (11) after core extraction to move out of the ground, start the second motor (8) to control the drill barrel (11) to vibrate continuously downward, and shake off the core sample stuck in the drill barrel (11).

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