Pavement compactness detection sample coring device

Abstract

The utility model discloses a pavement compactness detection sample coring device. The pavement compactness detection sample coring device comprises a support frame, a coring drill bit and a driving mechanism, the supporting frame comprises a top plate and a plurality of supporting legs connected to the periphery of the bottom of the top plate and used for supporting the top plate. The driving mechanism is connected between the top plate and the coring bit and used for driving the coring bit to rotate and move up and down. The first motor is arranged to drive the transmission shaft, the coring drill bit and the driving gear to rotate, the coring drill bit and the driving gear are connected to the transmission shaft, and meanwhile the driving gear drives the lifting rod to rotate through the driven gear. Therefore, the lifting rod can drive the driving mechanism to integrally move downwards, so that the coring drill bit rotates and simultaneously feeds downwards to cut a road surface and drill a certain depth or after the coring drill bit reaches a preset drilling depth, the first motor is controlled to rotate reversely, and the coring drill bit moves upwards to take out a sample to complete coring operation. And the problem that the traditional manual sample digging is very laborious is solved.

Description

Technical Field

[0001] This utility model belongs to the technical field of core sampling devices, and in particular relates to a core sampling device for road compaction testing samples. Background Technology

[0002] Compaction degree, also known as tamping degree, refers to the ratio of the dry density of compacted soil or other road construction materials to the standard maximum dry density, expressed as a percentage. Road surface compaction quality is one of the most important intrinsic indicators of road engineering construction quality management. Only by fully compacting the road surface structural layers can the strength, stiffness, stability, and smoothness of the road surface be guaranteed, thereby extending its service life. For soil and road base courses, compaction degree refers to the ratio of the actual dry density achieved on-site to the maximum dry density obtained from indoor standard compaction tests; for asphalt pavements, it refers to the ratio of the actual density achieved on-site to the indoor standard density.

[0003] Currently, the commonly used method for road surface sampling is the sand cone method. A test pit is dug according to the dimensions, the mass of the excavated sample is weighed, the moisture content of the sample is determined, and standard sand is poured into the test pit. The mass of standard sand used to fill the pit is calculated. Through a series of calculations, the compaction degree of the road surface can be obtained.

[0004] Traditional methods require manual operation when digging samples, which is very laborious, and it is difficult to dig if the road surface is hard. Utility Model Content

[0005] To address the problems existing in the prior art, the purpose of this utility model is to provide a core sampling device for road compaction testing.

[0006] To solve the above problems, the present invention adopts the following technical solution:

[0007] A core sampling device for road compaction testing includes a support frame, a core drill bit, and a drive mechanism. The support frame includes a top plate and several support legs connected around the bottom of the top plate for supporting the top plate. The drive mechanism is connected between the top plate and the core drill bit for driving the core drill bit to rotate and move up and down. The drive mechanism includes a transmission box, a first motor, a transmission shaft, a lifting rod, and a transmission gear set. The first motor is located at the top of the transmission box, the transmission shaft is connected to the output end of the first motor, the transmission shaft extends vertically downward through the transmission box, the core drill bit is connected to the bottom end of the transmission shaft, the transmission gear set is located inside the transmission box, the lower end of the lifting rod is rotatably connected to the transmission box, the upper half of the lifting rod is provided with external threads, the upper end of the lifting rod passes through the top plate and is threadedly connected to the top plate through the external threads, the transmission gear set includes a driving gear and a driven gear, the driving gear is sleeved on the transmission shaft and can rotate synchronously with the transmission shaft, the driven gear is sleeved on the lifting rod and can rotate synchronously with the lifting rod, and the driving gear and the driven gear mesh for transmission.

[0008] Preferably, the driven gear includes two primary driven gears and four secondary driven gears. There are four lifting rods. The four secondary driven gears are respectively sleeved on the four lifting rods. The two primary driven gears are respectively arranged on both sides of the driving gear and mesh with the driving gear for transmission. The four secondary driven gears are respectively arranged at the four corners of the driving gear and mesh with the two primary driven gears in pairs for transmission.

[0009] Preferably, the primary driven gear is a double-layer gear composed of a large and a small gear, wherein the large gear meshes with the driving gear and the diameter of the large gear is larger than the diameter of the driving gear, and the small gear meshes with the secondary driven gear and the diameter of the secondary driven gear is larger than the diameter of the small gear.

[0010] Preferably, a first pressure sensor is provided between the first motor and the top plate, the first pressure sensor is connected to the top of the first motor, a limit baffle is provided on the support leg, a second pressure sensor is provided on the limit baffle, the second pressure sensor is located directly below the transmission box, the first pressure sensor and the second pressure sensor are electrically connected to a control module, and the control module is electrically connected to the first motor.

[0011] Preferably, the top plate is provided with a suction box, and a vertical baffle is provided inside the suction box to divide the suction box into two parts. The baffle is provided with ventilation holes. A turbine fan blade is provided inside the suction box on one side of the baffle. A second motor is provided on the suction box. The turbine fan blade is connected to the output end of the second motor. A flexible telescopic corrugated pipe is connected to the side wall of the suction box on the other side of the baffle. A discharge pipe is provided at the bottom of the suction box on the other side of the baffle.

[0012] Preferably, the top plate is provided with upright plates around its top perimeter, which are then joined together to form an upward-opening main unit housing. The upper ends of the suction box, the second motor, and the lifting rod are all placed inside the main unit housing, and the top of the main unit housing is covered by a main unit housing cover.

[0013] Preferably, the bottom of the support leg is provided with folding rollers.

[0014] Preferably, the main unit chassis cover is provided with a handle.

[0015] Preferably, the main unit chassis cover is provided with control buttons.

[0016] Preferably, the control module is a PLC programmable control module.

[0017] The beneficial effects of this utility model are:

[0018] Compared with existing technologies, the advantages of this utility model are:

[0019] This invention uses a first motor to drive a transmission shaft, a core drill bit connected to the transmission shaft, and a drive gear to rotate. Simultaneously, the drive gear drives a lifting rod to rotate via a driven gear. Since the upper end of the lifting rod passes through the top plate and is threadedly connected to the top plate via an external thread, the lifting rod will drive the entire drive mechanism to move downwards. This causes the core drill bit to feed downwards and cut the road surface while rotating. After drilling to a certain depth or reaching a predetermined drilling depth, the first motor is controlled to reverse, causing the core drill bit to move upwards and bring out the sample, thus completing the core extraction operation. This solves the problem of the extremely laborious nature of traditional manual sample extraction. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a cross-sectional view of the present invention;

[0022] Figure 3 This is a schematic diagram of the connection structure of the core drill bit, first motor, drive shaft, lifting rod and transmission gear set of this utility model;

[0023] Figure 4 This is an exploded view of the connection structure of the suction box, baffle, turbine fan blade, second motor, flexible telescopic corrugated pipe and discharge pipe of this utility model.

[0024] In the diagram: 1. Support frame; 11. Top plate; 12. Support leg; 2. Core drill bit; 31. Transmission box; 32. First motor; 33. Drive shaft; 34. Lifting rod; 341. External thread; 35. Drive gear; 36. First-stage driven gear; 37. Second-stage driven gear; 4. Limiting baffle; 51. Suction box; 52. Baffle; 521. Vent hole; 53. Turbine fan blade; 54. Second motor; 55. Flexible telescopic corrugated pipe; 56. Discharge pipe; 61. Main unit box; 62. Main unit box cover; 7. Folding roller; 8. Handle. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] like Figure 1-4As shown, this utility model provides a technical solution: a core sampling device for road compaction testing, including a support frame 1, a core drill bit 2, and a drive mechanism; the support frame 1 includes a top plate 11 and a plurality of support legs 12 connected around the bottom of the top plate 11 for supporting the top plate 11; the drive mechanism is connected between the top plate 11 and the core drill bit 2 for driving the core drill bit 2 to rotate and move up and down, the drive mechanism includes a transmission box 31, a first motor 32, a transmission shaft 33, a lifting rod 34, and a transmission gear set, the first motor 32 is disposed on the top of the transmission box 31, the transmission shaft 33 is connected to the output end of the first motor 32, and the transmission shaft 33 passes through the transmission gear set. The housing 31 extends vertically downwards. The core drill bit 2 is connected to the bottom end of the drive shaft 33. The transmission gear set is set inside the transmission housing 31. The lower end of the lifting rod 34 is rotatably connected inside the transmission housing 31. The upper part of the lifting rod 34 is provided with an external thread 341. The upper end of the lifting rod 34 passes through the top plate 11 and is threadedly connected to the top plate 11 through the external thread 341. The transmission gear set includes a driving gear 35 and a driven gear. The driving gear 35 is sleeved on the drive shaft 33 and can rotate synchronously with the drive shaft 33. The driven gear is sleeved on the lifting rod 34 and can rotate synchronously with the lifting rod 34. The driving gear 35 and the driven gear mesh and transmit power.

[0027] In use, the core sampling device is moved to the core sampling location, and the first motor 32 is started. The first motor 32 drives the transmission shaft 33 and the core drill bit 2 and the drive gear 35 connected to the transmission shaft 33 to rotate. At the same time, the drive gear 35 drives the lifting rod 34 to rotate through the driven gear. Since the upper end of the lifting rod 34 passes through the top plate 11 and is threaded to the top plate 11 through the external thread 341, the lifting rod 34 will drive the entire drive mechanism to move downward, so that the core drill bit 2 feeds downward to cut the road surface while rotating. After drilling to a certain depth or reaching the predetermined drilling depth, the first motor 32 is controlled to reverse, so that the core drill bit 2 moves upward to bring out the sample, thereby completing the core sampling operation.

[0028] Furthermore, the driven gear includes two primary driven gears 36 and four secondary driven gears 37. There are four lifting rods 34. The four secondary driven gears 37 are respectively sleeved on the four lifting rods 34. The two primary driven gears 36 are respectively arranged on both sides of the driving gear 35 and mesh with the driving gear 35 for transmission. The four secondary driven gears 37 are respectively arranged at the four corners of the driving gear 35 and mesh with the two primary driven gears 36 in pairs for transmission. This makes the four lifting rods 34 distributed at the four corners of the driving gear 35 to support and lift the transmission box 31, making the structure more stable and the lifting smoother.

[0029] Furthermore, the primary driven gear 36 is a double-layer gear composed of a large and a small gear. The large gear meshes with the driving gear 35, and its diameter is larger than that of the driving gear 35. The small gear meshes with the secondary driven gear 37, and its diameter is larger than that of the small gear. During operation, the rotational speed of the lifting rod 34 is reduced through the two-stage reduction gear set, thereby decreasing the lifting speed of the lifting rod 34. This ensures that the core drill bit 2 maintains a high rotational speed while slowing down the downward drilling feed speed of the core drill bit 2, thus achieving stable core drilling and preventing damage to the core drill bit 2.

[0030] Furthermore, a first pressure sensor is provided between the first motor 32 and the top plate 11. The first pressure sensor is connected to the top of the first motor 32. A limit baffle 4 is provided on the support leg 12, and a second pressure sensor is provided on the limit baffle 4. The second pressure sensor is located directly below the transmission box 31. The first pressure sensor and the second pressure sensor are electrically connected to a control module, and the control module is electrically connected to the first motor 32. During operation, when the first motor 32 drives the transmission box 31 to move downward as a whole, when the bottom of the transmission box 31 touches the second pressure sensor provided on the limit baffle 4, the second pressure sensor moves towards the control module. The control module sends an electrical signal, and when it receives the signal, it stops the first motor 32. This allows the predetermined drilling depth to be adjusted based on the height of the limit baffle 4, preventing the transmission box 31 from moving too far downwards, which could lead to excessive drilling depth or the lifting rod 34 detaching from the top plate 11. When the first motor 32 drives the transmission box 31 to move upwards, the first pressure sensor at the top of the first motor 32 touches the top plate 11. The first pressure sensor then sends an electrical signal to the control module, which, upon receiving the signal, stops the first motor 32. This prevents the transmission box 31 from moving too far upwards, which could cause the first motor 32 to collide with the top plate 11 and be damaged. Specifically, the control module uses a PLC programmable control module, enabling it to receive electrical signals from the first and second pressure sensors and control the first motor 32.

[0031] Furthermore, a suction box 51 is provided on the top plate 11. A vertical baffle 52 divides the suction box 51 into two parts. A vent 521 is provided on the baffle 52. A turbine blade 53 is provided on one side of the baffle 52 inside the suction box 51. A second motor 54 is provided on the suction box 51, and the turbine blade 53 is connected to the output end of the second motor 54. A flexible telescopic corrugated pipe is connected to the side wall of the suction box 51 on the other side of the baffle 52. 55. A discharge pipe 56 is provided at the bottom of the suction box 51 on the other side of the baffle 52. After the core drill bit 2 completes the core drilling, the opening of the flexible telescopic corrugated pipe 55 is aligned with the core sample crushed stone. The second motor 54 is started to drive the turbine fan blade 53 to rotate, so that a negative pressure is formed in the suction box 51. The core sample crushed stone is sucked into the suction box 51 through the flexible telescopic corrugated pipe 55 and falls into the discharge pipe 56 after hitting the baffle 52. The worker places the container under the discharge pipe 56 to collect the core sample crushed stone, thus completing the collection of the core sample crushed stone.

[0032] Furthermore, upright plates are provided around the top of the top plate 11 and are joined with the top plate 11 to form an upward-opening main unit housing 61. The upper ends of the suction box 51, the second motor 54, and the lifting rod 34 are all placed inside the main unit housing 61, and the top of the main unit housing 61 is covered by a main unit housing cover 62. The main unit housing 61 and the main unit housing cover 62 protect the upper ends of the suction box 51, the second motor 54, and the lifting rod 34, thereby preventing exposed mechanical parts from causing injury and preventing dust from adhering to the surface of the external thread 341 of the lifting rod 34, which could cause the lifting rod 34 to jam or become stuck during lifting.

[0033] Furthermore, the bottom of the support leg 12 is provided with a folding roller 7. When the core retrieval device needs to be moved, the folding roller 7 is folded down to support it on the ground, making it easy to move the core retrieval device. When the core retrieval device is moved to the core retrieval location, the folding roller 7 is folded up to lift it off the ground, and the support leg 12 supports the core retrieval device.

[0034] Furthermore, a handle 8 is provided on the main unit cover 62. When the core drill bit 2 is drilling, the worker can hold the handle 8 with both hands to prevent the core drilling device from deviating and improve the core drilling accuracy.

[0035] Furthermore, a control button is provided on the top cover 62 of the main unit. The control button is electrically connected to the control module and can realize manual start / stop and lifting motion control of the PLC programmable control module.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A core sampling device for road compaction testing, characterized in that, include: Support frame (1), core drill bit (2) and drive mechanism; The support frame (1) includes a top plate (11) and a plurality of support legs (12) connected around the bottom of the top plate (11) for supporting the top plate (11). The drive mechanism is connected between the top plate (11) and the core drill bit (2) for driving the core drill bit (2) to rotate and move up and down. The drive mechanism includes a transmission box (31), a first motor (32), a transmission shaft (33), a lifting rod (34), and a transmission gear set. The first motor (32) is located on the top of the transmission box (31). The transmission shaft (33) is connected to the output end of the first motor (32). The transmission shaft (33) extends vertically downward through the transmission box (31). The core drill bit (2) is connected to the bottom end of the transmission shaft (33). The transmission gear set is located inside the transmission box (31). The lower end of the lifting rod (34) is rotatably connected to the transmission box (31). The upper half of the lifting rod (34) is provided with an external thread (341). The upper end of the lifting rod (34) passes through the top plate (11) and is threadedly connected to the top plate (11) through the external thread (341). The transmission gear set includes a driving gear (35) and a driven gear. The driving gear (35) is sleeved on the transmission shaft (33) and can rotate synchronously with the transmission shaft (33). The driven gear is sleeved on the lifting rod (34) and can rotate synchronously with the lifting rod (34). The driving gear (35) meshes with the driven gear for transmission.

2. The core sampling device for road compaction testing according to claim 1, characterized in that, The driven gears include two primary driven gears (36) and four secondary driven gears (37). There are four lifting rods (34). The four secondary driven gears (37) are respectively fitted on the four lifting rods (34). The two primary driven gears (36) are respectively set on both sides of the driving gear (35) and mesh with the driving gear (35) for transmission. The four secondary driven gears (37) are respectively set at the four corners of the driving gear (35) and mesh with the two primary driven gears (36) in pairs for transmission.

3. The core sampling device for road compaction testing according to claim 2, characterized in that, The first-stage driven gear (36) is a double-layer gear composed of two layers of gears, a large gear and a small gear. The large gear meshes with the driving gear (35) and the diameter of the large gear is greater than the diameter of the driving gear (35). The small gear meshes with the second-stage driven gear (37) and the diameter of the second-stage driven gear (37) is greater than the diameter of the small gear.

4. The pavement compaction test sample core sampling device according to claim 1, characterized in that, A first pressure sensor is provided between the first motor (32) and the top plate (11). The first pressure sensor is connected to the top of the first motor (32). A limit baffle (4) is provided on the support leg (12). A second pressure sensor is provided on the limit baffle (4). The second pressure sensor is located directly below the transmission box (31). The first pressure sensor and the second pressure sensor are electrically connected to a control module. The control module is electrically connected to the first motor (32).

5. The core sampling device for road compaction testing according to claim 4, characterized in that, A suction box (51) is provided on the top plate (11). A vertical baffle (52) is provided inside the suction box (51) to divide the suction box (51) into two parts. A vent hole (521) is provided on the baffle (52). A turbine fan blade (53) is provided on one side of the baffle (52) inside the suction box (51). A second motor (54) is provided on the suction box (51). The turbine fan blade (53) is connected to the output end of the second motor (54). A flexible telescopic corrugated pipe (55) is connected to the side wall on the other side of the baffle (52) inside the suction box (51). A discharge pipe (56) is provided at the bottom on the other side of the baffle (52) inside the suction box (51).

6. The core sampling device for road compaction testing according to claim 5, characterized in that, The top plate (11) has upright plates around its top perimeter, which are joined together with the top plate (11) to form an upward-opening main unit housing (61). The upper ends of the suction box (51), the second motor (54), and the lifting rod (34) are all placed inside the main unit housing (61). The top of the main unit housing (61) is covered by a main unit housing cover (62).

7. The pavement compaction test sample core sampling device according to claim 1, characterized in that, The bottom of the support leg (12) is provided with a folding roller (7).

8. A core sampling device for road compaction testing according to claim 6, characterized in that, The main unit chassis cover (62) is provided with a handle (8).

9. A core sampling device for road compaction testing according to claim 6, characterized in that, The main unit chassis cover (62) is provided with a control button, which is electrically connected to the control module.

10. A core sampling device for road compaction testing according to claim 4, characterized in that, The control module is a PLC programmable control module.

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