A drilling device applied to the outside of a highway guardrail

Abstract

The present application relates to a kind of drilling device applied to the outside of highway guardrail, the drilling device is used to drill on the outside of highway guardrail, the drilling device includes drill tool, it further includes mounting bracket, the mounting bracket is erected on highway guardrail, mounting bracket includes upper beam, lower beam, stringer and slide base, the upper beam and lower beam are laterally arranged in parallel, the stringer is vertically arranged between upper beam and lower beam, two stringers are respectively located at the front and rear ends of lower beam, the slide base is slidably arranged on lower beam along the length direction of lower beam, the drill tool is located at the lower side of lower beam and is fixedly installed on the slide base, and the upper beam, lower beam, stringer and slide base are all located on the outside of highway guardrail.The purpose of the present application is to solve or at least alleviate the problems of great safety risk and low drilling efficiency in the existing technology for drilling multiple holes on the outside of highway guardrail, and to provide a kind of drilling device applied to the outside of highway guardrail.

Description

Technical Field

[0001] This invention belongs to the technical field of road construction auxiliary equipment, and in particular relates to a drilling device for use on the outside of highway guardrails. Background Technology

[0002] Some safety facilities on elevated highways require drilling and installation on the outside of the guardrails, such as visual guidance signs and safety warning signs. The guardrails are 1100mm above the road surface, and the drilling locations are approximately 700mm above the road surface.

[0003] The current conventional drilling process is as follows:

[0004] (1) Surveying and setting out: Mark the location of the signboard on the top surface of the highway guardrail according to the design requirements of the drawings;

[0005] (2) Drilling: Construction personnel enter the construction basket outside the highway guardrail to drill holes. After each hole is drilled, the construction personnel must be evacuated and the basket moved before drilling the next hole.

[0006] (3) Sign installation: The sign is installed on the road surface using a mobile crane.

[0007] Drilling multiple holes in a suspended platform outside the highway guardrail requires frequent entry and exit from the platform. The use and storage of the platform can also pose safety hazards. Some people use homemade suspended platforms for this purpose. Overall, the existing technology for drilling multiple holes outside the highway guardrail has significant safety risks and low drilling efficiency. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art, solve or at least alleviate the problems of high safety risks and low drilling efficiency in the existing technology for drilling multiple holes on the outside of highway guardrails, and to provide a drilling device for use on the outside of highway guardrails.

[0009] This invention is achieved through the following technical solution:

[0010] A drilling device for use on the outside of a highway guardrail, the drilling device being used to drill holes on the outside of the highway guardrail, the drilling device including a drill bit and a mounting frame, the mounting frame being erected on the highway guardrail, the mounting frame including an upper beam, a lower beam, a longitudinal beam and a slide block, the upper beam and the lower beam being arranged horizontally in parallel, the longitudinal beam being arranged vertically between the upper beam and the lower beam, the two longitudinal beams being located at the front and rear ends of the lower beam respectively, the slide block being slidably disposed on the lower beam along the length direction of the lower beam, the drill bit being located on the lower side of the lower beam and fixedly installed on the slide block, the upper beam, the lower beam, the longitudinal beam and the slide block being all located on the outside of the highway guardrail.

[0011] To further realize the present invention, the following technical solutions may be preferred:

[0012] Preferably, the longitudinal section of the lower beam is I-shaped, and a traveling rack is fixedly provided on both sides of the vertical section of the lower beam. Several traveling gears are rotatably provided on both sides of the slide block, and the traveling gears mesh with the traveling racks for transmission.

[0013] Preferably, the slide includes a top plate and a bottom plate. The top plate is slidably disposed on the upper surface of the lower beam, and the bottom plate is located on the lower side of the lower beam and fixedly connected to the top plate. The traveling gear is rotatably disposed between the top plate and the bottom plate. A plurality of first transmission gears and a plurality of second transmission gears are rotatably disposed on the upper side of the top plate. The first transmission gears and the traveling gears are coaxially disposed. The number of first transmission gears and traveling gears is equal and they are arranged in a one-to-one correspondence. The second transmission gears are located between two adjacent first transmission gears along the length direction of the lower beam and mesh with the two first transmission gears for transmission.

[0014] Preferably, the longitudinal section of the upper beam is n-shaped, and an adjusting rod is provided inside the upper beam along its length. The adjusting rod is rotatably mounted on the upper beam. An adjusting seat is slidably mounted inside the upper beam along its length. A worm gear sleeve is rotatably mounted laterally on the adjusting seat, and a driving rod is rotatably mounted longitudinally on the adjusting seat. The worm gear sleeve is slidably fitted onto the adjusting rod along its axial direction and rotates with the adjusting rod. A worm wheel is fixedly fitted onto the upper part of the driving rod. The worm wheel is meshed with the worm gear sleeve and is connected for transmission. The upper part of the driving rod is fixedly rotatably connected to the slide and is also connected for transmission to the traveling gear.

[0015] Preferably, there are two drive rods, which are distributed on both sides of the worm sleeve, and each drive rod has a worm wheel that meshes with the worm sleeve on its upper part;

[0016] One of the drive rods is provided with a first drive gear at its lower part, and the first drive gear is connected to all the travel gears located on one side of the slide.

[0017] Another drive rod has a reversing rod rotatably mounted on its lower part. The reversing rod is rotatably mounted on the slide and fixedly fitted with a second drive gear. The second drive gear is connected to all the travel gears located on the other side of the slide. A reversing assembly is provided between the reversing rod and the drive rod. The reversing assembly drives the reversing rod and the drive rod to rotate synchronously in opposite directions.

[0018] Preferably, the reversing assembly includes an upper end face gear, a lower end face gear, and a reversing gear. The upper end face gear and the lower end face gear are arranged opposite each other and are respectively fixedly sleeved on the drive rod and the reversing rod. The reversing gear is longitudinally rotatably disposed on the slide and located between the upper end face gear and the lower end face gear. The upper and lower sides of the reversing gear are respectively meshed with the upper end face gear and the lower end face gear.

[0019] Preferably, a first ratchet is fixedly provided on the lower surface of the lower beam along its length direction, and a second ratchet is slidably provided on the slide block in the longitudinal direction. The first ratchet and the second ratchet are arranged opposite to each other, and a spring is provided between the second ratchet and the slide block. The spring drives the second ratchet to approach the first ratchet.

[0020] Preferably, the second ratchet is provided with a pull-down assembly, which includes a pull-down rod, a pull-down sleeve, and a pull-down rope. The pull-down rod is rotatably disposed inside the upper beam along the length direction of the upper beam. The pull-down sleeve is rotatably and laterally fixedly disposed on the adjusting seat. The pull-down sleeve slides and fits onto the pull-down rod along the axial direction of the pull-down rod and rotates with the pull-down rod. The upper end of the pull-down rope is fixedly wound around the pull-down sleeve, and the lower end of the pull-down rope extends downwards out of the lower side of the slide seat and connects upwards to the second ratchet.

[0021] Both the drive rod and the reversing rod are hollow tubular structures. The pull-down rope is installed inside the drive rod and the reversing rod, and the lower part of the pull-down rope passes through the slide and the lower beam to connect to the second ratchet rack.

[0022] Preferably, the front part of the upper beam extends forward and is mounted on the upper side of the highway guardrail. A clamping rod is slidably fitted onto a section of the upper beam that extends out of the highway guardrail. The clamping rod and the adjacent longitudinal beam clamp the highway guardrail tightly.

[0023] Preferably, the clamping rod is ⊥-shaped, with the upper part of the vertical section of the clamping rod slidingly fitted onto the upper beam, and a positioning plate being fixedly installed laterally on the lower side of the horizontal section of the clamping rod, the positioning plate abutting against the road surface inside the highway guardrail.

[0024] The beneficial effects of the present invention through the above technical solution are:

[0025] The mounting frame of this invention is erected on a highway guardrail, and the drilling tool is installed on the lower part of the sliding block that slides along the lower beam. The drilling operator drives the sliding block to slide towards the highway guardrail from the inside of the highway guardrail, thereby driving the drilling tool to drill.

[0026] Eliminating suspended platform operations allows construction workers to work inside the bridge railings, improving construction safety; reducing the need for repeatedly moving and inconvenient equipment, and adopting portable equipment improves construction efficiency. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the present invention;

[0028] Figure 2 This is a front view of the present invention;

[0029] Figure 3 For the present invention Figure 2 Sectional view at point AA;

[0030] Figure 4 For the present invention Figure 2Enlarged view of point B in the middle;

[0031] Figure 5 For the present invention Figure 3 Enlarged view of point C in the middle;

[0032] Figure 6 For the present invention Figure 3 Enlarged view at point D;

[0033] Figure 7 This is a schematic diagram of the lower beam and traveling rack of the present invention;

[0034] Figure 8 This is a schematic diagram of the slide block of the present invention;

[0035] Figure 9 This is a front view of the slide of the present invention;

[0036] Figure 10 This is a schematic diagram of the structure of the adjusting seat of the present invention;

[0037] Figure 11 This is a schematic diagram of the structure of the clamping rod and positioning plate of the present invention;

[0038] Wherein: 1-Drill tool; 2-Upper beam; 3-Lower beam; 4-Longitudinal beam; 5-Slide seat; 6-Traveling rack; 7-Traveling gear; 8-First transmission gear; 9-Second transmission gear; 10-Adjusting rod; 11-Adjusting seat; 12-Worm sleeve; 13-Drive rod; 14-Worm wheel; 15-First drive gear; 16-Second drive gear; 17-Reversing rod; 18-Upper end face gear; 19-Lower end face gear; 20-Reversing gear; 21-First ratchet rack; 22-Second ratchet rack; 23-Pull-down rod; 24-Pull-down sleeve; 25-Pull-down rope; 26-Clamping rod; 27-Positioning plate; 501-Top plate; 502-Bottom plate. Implementation

[0039] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0041] like Figures 1-11 As shown, a drilling device is used on the outside of a highway guardrail. The drilling device is used to drill holes on the outside of the highway guardrail. The drilling device includes a drill bit 1 and a mounting frame. The mounting frame is mounted on the highway guardrail and includes an upper beam 2, a lower beam 3, a longitudinal beam 4, and a slide block 5. The upper beam 2 and the lower beam 3 are arranged horizontally in parallel. The longitudinal beam 4 is arranged vertically between the upper beam 2 and the lower beam 3. The two longitudinal beams 4 are located at the front and rear ends of the lower beam 3, respectively. The slide block 5 is slidably mounted on the lower beam 3 along the length of the lower beam 3. The drill bit 1 is located on the lower side of the lower beam 3 and is fixedly mounted on the slide block 5. The upper beam 2, the lower beam 3, the longitudinal beam 4, and the slide block 5 are all located on the outside of the highway guardrail.

[0042] The mounting frame of the present invention is erected on the highway guardrail. The drill bit 1 is installed on the lower part of the slide block 5 that slides along the lower beam 3. The drilling personnel drive the slide block 5 to slide towards the highway guardrail from the inside of the highway guardrail, thereby driving the drill bit 1 to drill.

[0043] Eliminating suspended platform operations allows construction workers to work inside the bridge railings, improving construction safety; reducing the need for repeatedly moving and inconvenient equipment, and adopting portable equipment improves construction efficiency.

[0044] To facilitate the movement of the slide block 5 along the lower beam 3, the longitudinal section of the lower beam 3 is I-shaped. Both sides of the vertical section of the lower beam 3 are fixedly equipped with traveling racks 6, and both sides of the slide block 5 are rotatably equipped with several traveling gears 7. The traveling gears 7 mesh with the traveling racks 6 for transmission. To ensure the stability of the movement, there are three traveling gears 7 on both sides of the slide block 5.

[0045] To ensure reliable movement, in this embodiment, the slide block 5 includes a top plate 501 and a bottom plate 502. The top plate 501 is slidably disposed on the upper surface of the lower beam 3, and the bottom plate 502 is located on the lower side of the lower beam 3 and is fixedly connected to the top plate 501. The walking gear 7 is rotatably disposed between the top plate 501 and the bottom plate 502. Several first transmission gears 8 and several second transmission gears 9 are rotatably disposed on the upper side of the top plate 501. The first transmission gears 8 and the walking gears 7 are coaxially disposed, and the number of first transmission gears 8 and the walking gears 7 are equal and correspond one-to-one. The second transmission gear 9 is located between two adjacent first transmission gears 8 along the length direction of the lower beam 3 and meshes with the two first transmission gears 8 for transmission. Driving any one of the second transmission gears 9 on one side of the slide block 5 can cause all the walking gears 7 on that side to rotate synchronously in the same direction.

[0046] To enable construction workers to drive the sliding block 5 to move horizontally inside the highway guardrail, the longitudinal section of the upper beam 2 is n-shaped. An adjusting rod 10 is installed inside the upper beam 2 along its length. The adjusting rod 10 is rotatably mounted on the upper beam 2. An adjusting seat 11 is slidably mounted inside the upper beam 2 along its length. A worm gear sleeve 12 is fixedly mounted laterally and rotatably mounted longitudinally on the adjusting seat 11. The worm gear sleeve 12 slides along the adjusting rod 10 and rotates with the adjusting rod 10. A worm wheel 14 is fixedly mounted on the upper part of the driving rod 13. The worm wheel 14 meshes with the worm gear sleeve 12 for transmission. The upper part of the driving rod 13 is fixedly rotatably connected to the sliding block 5 and is also transmitted to the traveling gear 7. Rotating the adjusting rod 10 causes the worm gear sleeve 12 to drive the worm wheel 14 and the driving rod 13 to rotate. The driving rod 13 drives the traveling gear 7 to rotate, causing the sliding block 5 to move horizontally. At the same time as the sliding block 5 moves horizontally, the adjusting seat 11 moves horizontally with the sliding block 5.

[0047] In order to maintain the reliability of transmission and the stability of the translation of the adjusting seat 11, and to make the traveling gears 7 on both sides of the slide 5 rotate synchronously in opposite directions, there are two drive rods 13. The two drive rods 13 are distributed on both sides of the worm sleeve 12, and the upper part of the two drive rods 13 is provided with worm wheels 14 that mesh with the worm sleeve 12.

[0048] One of the drive rods 13 has a first drive gear 15 at its lower part. The first drive gear 15 is connected to all the walking gears 7 located on one side of the slide block 5. The first drive gear 15 meshes with any one of the first transmission gears 8.

[0049] Another drive rod 13 is coaxially rotatably equipped with a reversing rod 17 at its lower part. The reversing rod 17 is rotatably mounted on the slide 5 and fixedly fitted with a second drive gear 16. The second drive gear 16 is connected to all the travel gears 7 located on the other side of the slide 5. A reversing assembly is provided between the reversing rod 17 and the drive rod 13. The reversing assembly drives the reversing rod 17 and the drive rod 13 to rotate synchronously in opposite directions. The second drive gear 16 meshes with any one of the second transmission gears 9.

[0050] To optimize the product structure, in this embodiment, the reversing assembly includes an upper end face gear 18, a lower end face gear 19, and a reversing gear 20. The upper end face gear 18 and the lower end face gear 19 are arranged opposite each other and are respectively fixedly sleeved on the drive rod 13 and the reversing rod 17. The reversing gear 20 is longitudinally rotatably disposed on the slide 5 and located between the upper end face gear 18 and the lower end face gear 19. The upper and lower sides of the reversing gear 20 are respectively meshed with the upper end face gear 18 and the lower end face gear 19. The second drive gear 16 is located outside the circumference of the lower end face gear 19.

[0051] To improve drilling efficiency, the drill bit 1 will use an impact drill. When drilling with an impact drill, it will generate a reverse impact force on the slide block 5. In order to ensure the stability of the position of the slide block 5, a first ratchet 21 is fixedly installed on the lower surface of the lower beam 3 along its length direction. A second ratchet 22 is slidably installed on the slide block 5 in the longitudinal direction. The first ratchet 21 and the second ratchet 22 are arranged opposite to each other. A spring is installed between the second ratchet 22 and the slide block 5. The spring drives the second ratchet 22 to move closer to the first ratchet 21. Due to the elastic force of the spring, the drill bit 1 can only move in the direction of the highway guardrail and cannot move in the opposite direction.

[0052] To facilitate the removal of the drill bit 1 after drilling is completed, the second ratchet 22 is equipped with a pull-down assembly, which includes a pull-down rod 23, a pull-down sleeve 24, and a pull-down rope 25. The pull-down rod 23 is rotatably mounted inside the upper beam 2 along the length of the upper beam 2. The pull-down sleeve 24 is laterally fixed and rotatably mounted on the adjusting seat 11. The pull-down sleeve 24 slides along the axial direction of the pull-down rod 23 and rotates with the pull-down rod 23. The upper end of the pull-down rope 25 is fixedly wrapped around the pull-down sleeve 24, and the lower end of the pull-down rope 25 extends downwards from the lower side of the slide seat 5 and connects upwards to the second ratchet 22. Rotating the pull-down rod 23 drives the pull-down sleeve 24 to rotate, and the pull-down rope 25 is wrapped around the pull-down sleeve 24. The pull-down rope 25 moves the second ratchet 22 downwards and disengages it from the first ratchet 21. At this time, the adjusting rod 10 is rotated in the opposite direction, so that the slide seat 5 drives the drill bit 1 to move away from the highway guardrail.

[0053] To prevent the pull-down rope 25 from getting caught, the drive rod 13 and the reversing rod 17 are both hollow tubular structures. The pull-down rope 25 is installed inside the drive rod 13 and the reversing rod 17. The lower part of the pull-down rope 25 passes through the slide block 5 and the lower beam 3 and connects to the second ratchet rack 22.

[0054] The second ratchet 22 is located between the top plate 501 and the bottom plate 502 and is longitudinally slidably mounted on the bottom plate 502. A hollow guide post is provided on the upper side of the bottom plate 502. The second ratchet 22 is slidably fitted onto the guide post. A spring is fitted onto the guide post. The upper and lower ends of the spring abut against the second ratchet 22 and the bottom plate 502. The lower beam 3 is provided with a long groove along its length. The lower end of the pull rope 25 passes through the drive rod 13 or the reversing rod 17 and then passes through the long groove of the top plate 501 and the lower beam 3. It then passes through the guide post and exits the lower side of the bottom plate 502. Finally, it passes upward through the bottom plate 502 and connects to the second ratchet 22.

[0055] To facilitate a stable installation, the front part of the upper beam 2 extends forward and is mounted on the upper side of the highway guardrail. A clamping rod 26 is slidably fitted onto a section of the upper beam 2 that extends out of the highway guardrail. The clamping rod 26 and its adjacent longitudinal beam 4 clamp the highway guardrail. A locking device is provided on the upper part of the clamping rod 26. After the clamping rod 26 is in place, the locking device maintains the stability of the position of the clamping rod 26.

[0056] To optimize the product structure and further ensure the stability of the mounting frame's position during drilling, the clamping rod 26 is ⊥-shaped. The upper part of the vertical section of the clamping rod 26 is slidably fitted onto the upper beam 2, and a positioning plate 27 is horizontally fixed on the lower side of the horizontal section of the clamping rod 26. The positioning plate 27 abuts against the road surface inside the highway guardrail. During drilling, the construction personnel stand on the positioning plate 27, and the weight of the construction personnel makes the mounting frame less prone to shaking.

[0057] To improve applicability, in this embodiment, the vertical sections of the longitudinal beam 4 and clamping rod 26 and the drive rod 13 are all adjustable telescopic rod structures; in order to ensure that the slide 5 and the adjusting seat 11 can move synchronously, the slide 5 and the adjusting seat 11 are provided with connecting pipes, and the upper and lower ends of the connecting pipes are fixedly connected to the slide 5 and the adjusting seat 11 respectively, and the drive rod 13 and the reversing rod 17 are both located inside the connecting pipes.

[0058] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A drilling device for use on the outside of a highway guardrail, the drilling device being used to drill holes on the outside of the highway guardrail, the drilling device comprising a drill bit (1), characterized in that, It also includes an installation frame, which is erected on the highway guardrail. The installation frame includes an upper beam (2), a lower beam (3), a longitudinal beam (4), and a sliding block (5). The upper beam (2) and the lower beam (3) are arranged horizontally in parallel. The longitudinal beam (4) is arranged vertically between the upper beam (2) and the lower beam (3). The two longitudinal beams (4) are located at the front and rear ends of the lower beam (3), respectively. The sliding block (5) is slidably arranged on the lower beam (3) along the length direction of the lower beam (3). The drill bit (1) is located on the lower side of the lower beam (3) and is fixedly installed on the sliding block (5). The upper beam (2), the lower beam (3), the longitudinal beam (4), and the sliding block (5) are all located on the outside of the highway guardrail. The longitudinal section of the lower beam (3) is I-shaped. Both sides of the vertical section of the lower beam (3) are fixedly provided with a traveling rack (6). Both sides of the slide (5) are rotatably provided with several traveling gears (7). The traveling gears (7) mesh with the traveling rack (6) for transmission. The longitudinal section of the upper beam (2) is n-shaped. An adjusting rod (10) is provided inside the upper beam (2) along the length direction of the upper beam (2). The adjusting rod (10) is rotatably provided on the upper beam (2). An adjusting seat (11) is slidably provided inside the upper beam (2) along its length direction. A worm sleeve (12) is rotatably provided in the adjusting seat (11) in the transverse direction and a driving rod (13) is rotatably provided in the longitudinal direction. The worm sleeve (12) is slidably fitted onto the adjusting rod (10) along the axial direction of the adjusting rod (10) and rotates with the adjusting rod (10). A worm wheel (14) is fixedly fitted on the upper part of the driving rod (13). The worm wheel (14) is meshed with the worm sleeve (12) and is connected to the transmission. The upper part of the driving rod (13) is fixedly rotatably connected to the slide (5) and is connected to the traveling gear (7). There are two drive rods (13), which are distributed on both sides of the worm sleeve (12). Each of the two drive rods (13) has a worm wheel (14) that meshes with the worm sleeve (12) on its upper part. One of the drive rods (13) is provided with a first drive gear (15) at the lower part, and the first drive gear (15) is connected to all the walking gears (7) located on one side of the slide (5). Another drive rod (13) is coaxially rotatably provided with a reversing rod (17) at its lower part. The reversing rod (17) is rotatably provided on the slide (5) and fixedly fitted with a second drive gear (16). The second drive gear (16) is connected to all the travel gears (7) located on the other side of the slide (5). A reversing assembly is provided between the reversing rod (17) and the drive rod (13). The reversing assembly drives the reversing rod (17) and the drive rod (13) to rotate synchronously in opposite directions. The reversing assembly includes an upper end face gear (18), a lower end face gear (19), and a reversing gear (20). The upper end face gear (18) and the lower end face gear (19) are arranged opposite to each other and are respectively fixedly sleeved on the drive rod (13) and the reversing rod (17). The reversing gear (20) is longitudinally rotatably arranged on the slide (5) and located between the upper end face gear (18) and the lower end face gear (19). The upper and lower sides of the reversing gear (20) are respectively meshed with the upper end face gear (18) and the lower end face gear (19). A first ratchet (21) is fixedly provided on the lower surface of the lower beam (3) along its length direction, and a second ratchet (22) is slidably provided on the slide block (5) in the longitudinal direction. The first ratchet (21) and the second ratchet (22) are arranged opposite to each other. A spring is provided between the second ratchet (22) and the slide block (5), and the spring drives the second ratchet (22) to approach the first ratchet (21). The second ratchet (22) is provided with a pull-down assembly, which includes a pull-down rod (23), a pull-down sleeve (24) and a pull-down rope (25). The pull-down rod (23) is rotatably disposed in the upper beam (2) along the length direction of the upper beam (2). The pull-down sleeve (24) is rotatably disposed in the adjusting seat (11) in a horizontal direction. The pull-down sleeve (24) slides along the pull-down rod (23) axially and rotates with the pull-down rod (23). The upper end of the pull-down rope (25) is fixedly wrapped around the pull-down sleeve (24). The lower end of the pull-down rope (25) extends downwards from the lower side of the slide seat (5) and connects upwards to the second ratchet (22). The drive rod (13) and the reversing rod (17) are both hollow tubular structures. The pull-down rope (25) is arranged inside the drive rod (13) and the reversing rod (17). The lower part of the pull-down rope (25) passes through the slide (5) and the lower beam (3) and is connected to the second ratchet (22).

2. The drilling device for use on the outside of a highway guardrail according to claim 1, characterized in that, The slide (5) includes a top plate (501) and a bottom plate (502). The top plate (501) is slidably disposed on the upper surface of the lower beam (3). The bottom plate (502) is located on the lower side of the lower beam (3) and is fixedly connected to the top plate (501). The traveling gear (7) is rotatably disposed between the top plate (501) and the bottom plate (502). Several first transmission gears (8) and several second transmission gears (9) are rotatably disposed on the upper side of the top plate (501). The first transmission gears (8) and the traveling gears (7) are coaxially disposed. The number of first transmission gears (8) and traveling gears (7) is equal and they are arranged in a one-to-one correspondence. The second transmission gear (9) is located between two adjacent first transmission gears (8) along the length direction of the lower beam (3) and meshes with the two first transmission gears (8) for transmission.

3. A drilling device for use on the outside of a highway guardrail according to claim 1, characterized in that, The upper beam (2) extends forward and is mounted on the upper side of the highway guardrail. A section of the upper beam (2) extending out of the highway guardrail is slidably fitted with a clamp (26). The clamp (26) and its adjacent longitudinal beam (4) clamp the highway guardrail.

4. The drilling device applied to the outside of the highway guardrail according to claim 3, characterized in that, The clamp (26) is ⊥-shaped. The upper part of the vertical section of the clamp (26) is slidably fitted onto the upper beam (2). A positioning plate (27) is fixedly installed on the lower side of the horizontal section of the clamp (26). The positioning plate (27) abuts against the road surface inside the highway guardrail.

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