A road core drilling machine that facilitates core extraction

Abstract

This invention provides a road core drilling machine that facilitates core extraction, solving the problem of forcing core samples to detach by hammering the outer wall of the core cylinder. This method not only fails to guarantee core sample detachment but also breaks or damages the core sample, thus affecting the accuracy of subsequent mechanical property test results. This invention creates two through-holes in the drill cylinder, corresponding to each other along the radial direction of the cylinder. Two fixing rods are installed on the frame, each with a groove corresponding to the center of the drill cylinder in the left-right direction. After drilling, the insert rod is inserted into the grooves, through the through-holes, and into the drill cylinder. As the lifting mechanism drives the mounting base upward, the insert rod compresses the core sample inside the drill cylinder, forcing the bottom end of the core sample out of the cylinder. This facilitates the complete removal of the core sample without breaking or damaging it, ensuring the accuracy of subsequent mechanical property test results.

Description

Technical Field

[0001] This utility model relates to the field of road inspection technology, and in particular to a road core drilling machine that facilitates core extraction. Background Technology

[0002] Asphalt pavement, by incorporating asphalt binder into mineral materials, significantly enhances the pavement's resistance to traffic loads and natural erosion, offering outstanding advantages such as high smoothness, impermeability, and strong durability. In new construction and reconstruction / expansion asphalt pavement projects, drilling core samples from the structural layers for mechanical property testing has become a necessary step in quality control, and core drilling machines have become an indispensable core piece of equipment in road engineering.

[0003] However, in actual coring operations, when the core barrel completes drilling and rises, the core sample is often stuck inside the core barrel due to the combined effects of vacuum adsorption and frictional resistance of the barrel wall. On-site, the method of hammering the outer wall of the core barrel is often used to force the core sample to fall off. This method of hammering not only cannot guarantee the core sample to fall off, but will also break or damage the core sample, which will affect the accuracy of the mechanical property test results of the core sample in the later stage. Utility Model Content

[0004] To address the problem in the prior art that the method of hammering the outer wall of the core cylinder to force the core sample to detach is not only unable to guarantee the core sample detachment but may also shatter or damage the core sample, thereby affecting the accuracy of the subsequent mechanical property test results of the core sample, this utility model proposes a road core drilling machine that facilitates core extraction.

[0005] The technical solution of this utility model is: a road core drilling machine that facilitates core extraction, including a frame, the frame including a base frame, two guide rods that are spaced apart from each other and extend upward are fixedly provided on the base frame, and a connecting rod is fixedly provided at the top of the two guide rods;

[0006] The frame is equipped with a lifting mechanism, which in turn is equipped with a mounting base. The mounting base is equipped with a drilling assembly. The lifting mechanism can move up and down together by driving the mounting base and the drilling assembly located on the mounting base. The drilling assembly includes a bearing fixed to the front side of the mounting base. The bearing has a drive shaft that rotates through the bearing. The bottom end of the drive shaft passes through the bearing and is fixed to a drill cylinder. The side wall of the drill cylinder has two through holes that are corresponding to each other in the radial direction of the drill cylinder. The through holes extend in the vertical direction. Each of the two guide rods has a fixed rod that extends forward. The front end of the fixed rod has a groove that is open to the left and right and has a front opening. The two grooves correspond to the center of the drill cylinder in the left and right direction, so that the two grooves can correspond to the through holes in the left and right. The two grooves and the through holes together have a insertion rod inserted into the drill cylinder. The insertion rod can squeeze out the core sample in the drill cylinder during the upward movement of the drill cylinder.

[0007] Preferably, the drill barrel includes a main barrel and an extension barrel. The top end of the main barrel is fixedly connected to the bottom end of the drive shaft. The inner wall of the bottom end of the main barrel is provided with a first trapezoidal internal thread section, and the outer wall of the top end of the extension barrel is provided with a first trapezoidal external thread section. The bottom end of the main barrel and the top end of the extension barrel are threadedly connected by the first trapezoidal internal thread section and the first trapezoidal external thread section.

[0008] Preferably, the bottom end of the extended cylinder is provided with a drill bit, which is a tubular structure with annular serrations at the bottom end. The inner wall of the bottom end of the extended cylinder is provided with a second trapezoidal internal thread section, and the outer wall of the top end of the drill bit is provided with a second trapezoidal external thread section. The bottom end of the extended cylinder and the top end of the drill bit are threadedly connected through the second trapezoidal internal thread section and the second trapezoidal external thread section.

[0009] Preferably, the lifting mechanism includes a screw rod that is rotatably mounted on the connecting rod via a ball bearing. The screw rod extends in the vertical direction, and the top end of the screw rod passes through the connecting rod and is fixedly provided with a rotating handle. An internally threaded sleeve is fixedly mounted inside the mounting base, and the internally threaded sleeve is threaded onto the screw rod.

[0010] The mounting base has connectors at both ends. A U-shaped slider is fixed at the end of the connector away from the mounting base, and the U-shaped slider slides on the guide rod.

[0011] Preferably, the mounting base is provided with a drive mechanism, which is connected to the drilling assembly in a transmission manner. The drive mechanism is used to drive the drive shaft inside the drilling assembly to rotate. The drive mechanism includes a fixed plate fixedly mounted at the bottom end of the mounting base and extending rearward. A drive motor is fixedly mounted on the top of the fixed plate. The output shaft of the drive motor passes through the fixed plate and is fixedly mounted on a first tensioning wheel. A second tensioning wheel is fixedly mounted on the drive shaft. A belt is connected to the first tensioning wheel and the second tensioning wheel in a transmission manner.

[0012] Preferably, two support rods are fixedly provided on the rear side of the connecting rod, which are spaced apart from each other and tilted backward, and the bottom end of the support rods is fixedly provided on the rear end of the base frame.

[0013] Advantages of this invention: This invention creates two through-holes in the drill barrel used for drilling road surfaces, corresponding to each other in the radial direction of the drill barrel. Simultaneously, two fixed rods are installed on the frame, each with two grooves in the left-right direction corresponding to the center of the drill barrel (i.e., corresponding to the two through-holes). After drilling is completed, when the insert rod is inserted into the two grooves, through-holes, and drill barrel, and the lifting mechanism drives the mounting base and the drilling assembly located on the mounting base to move upwards, the insert rod can compress the core sample inside the drill barrel, forcing the bottom end of the core sample out of the drill barrel. This facilitates the removal of the complete core sample without breaking or damaging it, ensuring the accuracy of subsequent mechanical property test results. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This utility model Figure 1 Another perspective structure;

[0017] Figure 3 This is an exploded view of the drill barrel structure of this utility model.

[0018] In the diagram: 1. Frame; 11. Base frame; 12. Guide rod; 13. Connecting rod; 14. Support rod; 2. Lifting mechanism; 21. Screw; 22. Rotary handle; 23. Internal threaded sleeve; 24. Connector; 25. U-shaped slider; 3. Mounting base; 4. Drilling assembly; 41. Shaft seat; 42. Drive shaft; 43. Drill barrel; 431. Main barrel; 432. Extended barrel; 44. Drill bit; 5. Drive mechanism; 51. Fixing plate; 52. Drive motor; 53. First tensioning wheel; 54. Second tensioning wheel; 55. Belt; 6. Strip hole; 7. Fixing rod; 8. Insert rod. Detailed Implementation

[0019] 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.

[0020] Example 1: A road core drilling machine that facilitates core extraction, such as Figure 1-3 As shown, the system includes a frame 1, which includes a base frame 11. Two guide rods 12, spaced apart horizontally and extending upwards, are fixedly mounted on the base frame 11. The guide rods 12 are square steel pipes. Connecting rods 13 are fixedly mounted on the top ends of the two guide rods 12. The two guide rods 12, the base frame 11, and the connecting rods 13 together form a rectangular frame structure, making the structure more stable. Two support rods 14, spaced apart horizontally and tilted backwards, are fixedly mounted on the rear side of the connecting rods 13. The bottom ends of the support rods 14 are fixedly mounted on the rear end of the base frame 11. The support rods 14 can support the top of the rectangular frame structure, further improving the structural stability of the rectangular frame structure.

[0021] A lifting mechanism 2 is provided on the frame 1, a mounting base 3 is provided on the lifting mechanism 2, and a drilling assembly 4 is provided on the mounting base 3. The lifting mechanism 2 can drive the mounting base 3 and the drilling assembly 4 located on the mounting base 3 to move up and down together to complete the drilling operation. The drilling assembly 4 includes a bearing 41 fixedly installed on the front side of the mounting base 3. The bearing 41 is rotatably mounted on a drive shaft 42 via a bearing. The bottom end of the drive shaft 42 passes through the bearing 41 and is fixedly mounted on a drill cylinder 43. The drill cylinder 43 is a cylindrical structure with a bottom opening. Two through holes 6 are provided on the side wall of the drill cylinder 43, which are corresponding to each other in the radial direction of the drill cylinder 43. The through holes 6 extend in the vertical direction. Each of the two guide rods 12 is provided with a fixed rod 7 extending forward. The fixed rod 7 is offset from the drilling assembly 4 in the planar direction. To prevent collisions when the drilling assembly 4 moves up and down, the front end of the fixing rod 7 has a groove that is open to the left and right and has a front opening. The two grooves correspond to the center of the drill cylinder 43 in the left and right direction, so that the two grooves can correspond to the strip hole 6 in the left and right directions. The two grooves and the strip hole 6 are connected by an insertion rod 8. The insertion rod 8 is inserted into the drill cylinder 43. After drilling is completed, the insertion rod 8 is inserted into the two grooves, the strip hole 6 and the drill cylinder 43. During the process of the lifting mechanism 2 driving the mounting base 3 and the drilling assembly 4 located on the mounting base 3 to move upward, the insertion rod 8 can squeeze the core sample located in the drill cylinder 43 and squeeze the bottom end of the core sample out of the drill cylinder 43, so as to facilitate the removal of the complete core sample without breaking or damaging the core sample, thus ensuring the accuracy of the mechanical property test results of the core sample in the later stage.

[0022] The drill barrel 43 includes a main barrel 431 and an extension barrel 432. The main barrel 431 is a cylindrical structure with an opening at the bottom. The top end of the main barrel 431 is fixedly connected to the bottom end of the drive shaft 42. The extension barrel 432 is a tubular structure that is open at both ends. The inner wall of the bottom end of the main barrel 431 has a first trapezoidal internal thread section, and the outer wall of the top end of the extension barrel 432 has a first trapezoidal external thread section. The bottom end of the main barrel 431 and the top end of the extension barrel 432 are threadedly connected by the first trapezoidal internal thread section and the first trapezoidal external thread section. Installing or removing the extension tube 432 allows the core drill to adjust the overall length of the drill tube 43 according to the road thickness requirements, so as to be suitable for road surfaces of different thicknesses. The rotation direction of the extension tube 432 when it is threaded into the main tube 431 is opposite to the rotation direction of the drill tube 43 when drilling the road surface, so as to prevent the extension tube 432 from detaching from the main tube 431 during the drilling process. At the same time, when the extension tube 432 is fully inserted into the main tube 431, the strip hole 6 on the main tube 431 corresponds vertically to the strip hole 6 on the extension tube 432.

[0023] The bottom end of the extended cylinder 432 is equipped with a drill bit 44, which is a tubular structure with annular serrations at the bottom end. The drill bit 44 facilitates the drilling cylinder 43 to break through hard road surfaces and improves drilling efficiency. The inner wall of the bottom end of the extended cylinder 432 is provided with a second trapezoidal internal thread section, and the outer wall of the top end of the drill bit 44 is provided with a second trapezoidal external thread section. The bottom end of the extended cylinder 432 and the top end of the drill bit 44 are threadedly connected through the second trapezoidal internal thread section and the second trapezoidal external thread section. The rotation direction of the drill bit 44 when it is threaded into the extended cylinder 432 is opposite to the rotation direction of the drilling cylinder 43 when drilling the road surface, so as to prevent the drill bit 44 from disengaging from the extended cylinder 432 during the drilling process. At the same time, the second trapezoidal external thread section on the drill bit 44 is compatible with the first trapezoidal internal thread section on the main cylinder 431, so that after the extended cylinder 432 is disassembled, the drill bit 44 can be installed at the bottom end of the main cylinder 431 for use.

[0024] The lifting mechanism 2 includes a screw 21 that is rotatably mounted on the connecting rod 13 via a ball bearing. The screw 21 extends vertically, and its top end protrudes from the connecting rod 13 and is fixedly fitted with a handle 22. An internally threaded sleeve 23 is fixedly mounted inside the mounting base 3 and threaded onto the screw 21. Connectors 24 are provided at both ends of the mounting base 3. A U-shaped slider 25 is fixedly mounted at the end of the connector 24 away from the mounting base 3. The U-shaped slider 25 slides on the guide rod 12 to guide the mounting base 3 to move up and down. By rotating the handle 22, the mounting base 3 can be moved up and down by the internally threaded sleeve 23 under the action of the thread, thereby driving the drilling assembly 4 located on the mounting base 3 to move up and down for drilling operations.

[0025] The mounting base 3 is equipped with a drive mechanism 5, which is connected to the drilling assembly 4. The drive mechanism 5 is used to drive the drive shaft 42 inside the drilling assembly 4 to rotate, thereby driving the drill barrel 43 to rotate for drilling operations. Specifically, the drive mechanism 5 includes a fixed plate 51 fixedly mounted at the bottom end of the mounting base 3 and extending rearward. A drive motor 52 is fixedly mounted on the top of the fixed plate 51. The output shaft of the drive motor 52 passes through the fixed plate 51 and is fixedly mounted with a first tensioning wheel 53. A second tensioning wheel 54 is fixedly mounted on the drive shaft 42. A belt 55 is connected to the first tensioning wheel 53 and the second tensioning wheel 54 for transmission. During the driving process, the drive motor 52 can drive the drive shaft 42 and the drill barrel 43 to rotate through the transmission of the first tensioning wheel 53, the second tensioning wheel 54, and the belt 55, thereby realizing the drilling operation.

[0026] Working principle: During the drilling stage, the drive motor 52 drives the drive shaft 42 to rotate via the belt 55. The drive shaft 42 drives the drill barrel 43 and drill bit 44 to rotate and cut the road surface. Then, the rotating handle 22 drives the screw 21, which drives the mounting seat 3 to move down through the internal threaded sleeve 23. The U-shaped slider 25 slides along the guide rod 12 to ensure verticality. During the downward movement of the mounting seat 3, the drill barrel 43 and drill bit 44 in the drilling assembly 4 continue to cut the road surface downward. After drilling is completed, the insertion rod 8 is passed through the groove of the fixing rod 7 and the strip hole 6 of the drill barrel 43. The rotating handle 22 is reversed to lift the mounting seat 3. The insertion rod 8 serves as a fixed fulcrum. When the drill barrel 43 rises, its inner wall and the core sample are relatively displaced, squeezing the bottom end of the core sample out of the drill barrel 43. Then, the core sample is completely pulled out.

[0027] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims and not by the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A pavement coring machine that facilitates coring, characterized by: Includes a frame (1), the frame (1) includes a base frame (11), and two guide rods (12) are fixedly provided on the base frame (11) with left and right spacing and upward extension, and a connecting rod (13) is fixedly provided at the top of the two guide rods (12). A lifting mechanism (2) is provided on the frame (1), a mounting base (3) is provided on the lifting mechanism (2), and a drilling assembly (4) is provided on the mounting base (3). The lifting mechanism (2) can move up and down together by driving the mounting base (3) and the drilling assembly (4) located on the mounting base (3). The drilling assembly (4) includes a bearing (41) fixedly installed on the front side of the mounting base (3). The bearing (41) is rotatably provided with a drive shaft (42) through a bearing. The bottom end of the drive shaft (42) passes through the bearing (41) and is fixedly provided with a drill barrel (43). Two through holes are opened on the side wall of the drill barrel (43) and are connected along the drill barrel (43). 3) Corresponding radial strip hole (6) The strip hole (6) extends in the vertical direction. Both guide rods (12) are provided with a fixed rod (7) extending forward. The front end of the fixed rod (7) is provided with a groove that is open to the left and right and has a front opening. The two grooves correspond to the center of the drill barrel (43) in the left and right direction, so that the two grooves can correspond to the strip hole (6) in the left and right. The two grooves and the strip hole (6) are connected together with the insertion rod (8). The insertion rod (8) is inserted into the drill barrel (43). The insertion rod (8) can squeeze out the core sample in the drill barrel (43) during the upward movement of the drill barrel (43).

2. A road core drill for facilitating coring according to claim 1, characterized in that: The drill barrel (43) includes a main barrel (431) and an extension barrel (432). The top end of the main barrel (431) is fixedly connected to the bottom end of the drive shaft (42). The inner wall of the bottom end of the main barrel (431) is provided with a first trapezoidal internal thread section, and the outer wall of the top end of the extension barrel (432) is provided with a first trapezoidal external thread section. The bottom end of the main barrel (431) and the top end of the extension barrel (432) are threadedly connected by the first trapezoidal internal thread section and the first trapezoidal external thread section.

3. A road core drill for facilitating coring according to claim 2, characterized in that: The bottom end of the extended cylinder (432) is provided with a drill bit (44), which is a tubular structure with annular serrations at the bottom end. The inner wall of the bottom end of the extended cylinder (432) is provided with a second trapezoidal internal thread section, and the outer wall of the top end of the drill bit (44) is provided with a second trapezoidal external thread section. The bottom end of the extended cylinder (432) and the top end of the drill bit (44) are connected by the second trapezoidal internal thread section and the second trapezoidal external thread section.

4. A road core drilling machine for easy core extraction according to claim 1, characterized in that: The lifting mechanism (2) includes a screw (21) that is rotatably mounted on the connecting rod (13) via a ball bearing. The screw (21) extends in the vertical direction. The top end of the screw (21) passes through the connecting rod (13) and is fixedly provided with a handle (22). An internal threaded sleeve (23) is fixedly mounted inside the mounting base (3). The internal threaded sleeve (23) is threaded onto the screw (21). The mounting base (3) has connectors (24) at both ends. A U-shaped slider (25) is fixed at the end of the connector (24) away from the mounting base (3). The U-shaped slider (25) slides on the guide rod (12).

5. A road core drilling machine for easy core extraction according to claim 1, characterized in that: The mounting base (3) is provided with a drive mechanism (5), which is connected to the drilling assembly (4) for transmission. The drive mechanism (5) is used to drive the drive shaft (42) inside the drilling assembly (4) to rotate. The drive mechanism (5) includes a fixed plate (51) fixedly installed at the bottom end of the mounting base (3) and extending backward. A drive motor (52) is fixedly installed on the top of the fixed plate (51). The output shaft of the drive motor (52) passes through the fixed plate (51) and is fixedly installed with a first tensioning wheel (53). A second tensioning wheel (54) is fixedly sleeved on the drive shaft (42). A belt (55) is connected to the first tensioning wheel (53) and the second tensioning wheel (54) for transmission.

6. A road core drilling machine for easy core sampling according to claim 1, characterized in that: Two support rods (14) are fixedly provided on the rear side of the connecting rod (13) and are arranged at left and right intervals and tilted backward. The bottom end of the support rod (14) is fixedly provided on the rear end of the base frame (11).

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