Drilling apparatus for road construction blasting

Abstract

Disclosed is a drilling apparatus for road construction blasting, comprising: a work platform, wherein a plurality of support legs are provided below the work platform; a material collection box, capable of being raised and lowered, arranged below the workbench, and detachably connected to the work platform, a material guide hole being formed in the bottom wall of the material collection box; and a material guide cylinder, wherein the material guide cylinder is vertically inserted into the material guide hole and is detachably connected to the material collection box, a spiral drill rod is rotatably inserted into the material guide cylinder, the top of the spiral drill rod is inserted into the material collection box and rotatably connected to the top wall of the material collection box, the spiral drill rod is driven by a driving motor located at the top of the material collection box to rotate, the bottom of the spiral drill rod extends out of the material guide cylinder, the spiral drill rod extending out of the material guide cylinder is divided into a feeding portion and a drilling portion from top to bottom, the outer diameter of the feeding portion is the same as the outer diameter of the spiral drill rod located in the material guide cylinder, and the outer diameter of the drilling portion is not smaller than the outer diameter of the material guide cylinder. The present invention can effectively prevent drilling waste from piling up or spilling around the drilling area during drilling, avoid the waste from covering surrounding drilled holes, and reduce flying dust.

Description

Hole-opening device for road construction blasting Technical Field

[0001] The present invention relates to the technical field of construction machinery for building engineering, and in particular to a hole-opening device for blasting in road construction. Background Art

[0002] During road construction, it is often necessary to demolish unwanted structures by blasting. The drill-and-blast method, commonly used in construction, refers to a method of excavating rock through drilling, charging, and blasting. Holes are drilled according to the drill-and-blast requirements, and then filled with explosives to achieve directional blasting. Drilling requires the use of drilling equipment. Chinese patent publication number CN115234165B discloses a blasting drilling device for blasting construction. During use, a worker holds a handle and places the drill bit on the work surface to be drilled. The drill bit is driven by a motor to rotate to drill the work surface. However, the device lacks an automatic material guide function, and debris, dust, and other waste materials generated during the drilling process are directly scattered in the area surrounding the drill hole, easily generating dust that can cover the already drilled hole.

[0003] Summary of the Invention

[0004] The purpose of the present invention is to provide a hole-opening device for road construction blasting, which inserts the top of the spiral drilling rod into the aggregate box and sets a material guide cylinder connected to the aggregate box on the outer periphery of the spiral drilling rod. During the drilling process, the spiral drilling rod transports the drilling waste into the aggregate box through the spiral groove and the material guide cylinder, thereby realizing the collection of the drilling waste.

[0005] The present invention provides a hole-opening device for road construction blasting, comprising:

[0006] A workbench, with a plurality of supporting legs arranged underneath;

[0007] A material collecting box is arranged to be lifted below the workbench and is detachably connected to the workbench, and a material guide hole is provided on the bottom wall of the material collecting box;

[0008] The material guide cylinder is vertically inserted in the material guide hole and is detachably connected to the aggregate box. A spiral drilling rod is rotatably inserted in the material guide cylinder. The top of the spiral drilling rod is inserted into the aggregate box and is rotatably connected to the top wall of the aggregate box, and is connected to the output shaft of the driving motor located at the top of the aggregate box and is driven to rotate by the driving motor. The bottom of the spiral drilling rod extends out of the material guide cylinder, and the spiral drilling rod extending out of the material guide cylinder is divided into a feeding part and a drilling part from top to bottom. The outer diameter of the feeding part is the same as the outer diameter of the spiral drilling rod located in the material guide cylinder, and the outer diameter of the drilling part is not less than the outer diameter of the material guide cylinder.

[0009] Preferably, in the hole-opening device for road construction blasting, a support plate is provided on the workbench for horizontal movement, a hydraulic cylinder is provided on the support plate, a horizontal lifting plate is provided at the telescopic top end of the hydraulic cylinder, and vertical first connecting plates are detachably provided at both ends of the lifting plate, and the two first connecting plates are respectively connected to the two side walls of the aggregate box through the lifting holes on the support plate.

[0010] Preferably, in the hole-opening device for road construction blasting, both ends of the lifting plate are bent downward to form vertical second connecting plates, the two first connecting plates are located between the two second connecting plates and are respectively connected to the corresponding second connecting plates through a plurality of first screws and first nut structures.

[0011] Preferably, in the hole-opening device for road construction blasting, the outer peripheral movable sleeve of the guide cylinder is provided with a horizontal protective plate, and a plurality of vertical third connecting plates are provided at both ends of the protective plate, and a plurality of connecting vertical slide grooves are provided on the two side walls of the aggregate box and the first connecting plates corresponding thereto, and a slider is provided in the slide groove, and the slider is detachably connected to the top of the corresponding third connecting plate.

[0012] Preferably, in the hole-opening device for road construction blasting, a connecting hole is provided on the third connecting plate, a connecting screw is inserted into the connecting hole, and the tail end of the connecting screw is inserted into the connecting threaded hole on the slider.

[0013] Preferably, in the hole-opening device for road construction blasting, a protective cylinder is provided around the protective hole corresponding to the material guide cylinder below the protective plate, and a connecting cylinder is provided around the protective hole above the protective plate, and the connecting cylinder is movably sleeved around the outer periphery of the material guide cylinder.

[0014] Preferably, in the hole-opening device for road construction blasting, a movable hole is provided on the workbench, a pair of horizontal movable grooves are provided on the workbench around the movable hole, and both side portions of the support plate are movably inserted into the pair of movable grooves respectively.

[0015] Preferably, in the hole-opening device for road construction blasting, a horizontal screw is rotatably arranged in the movable groove, the support plate is movably sleeved on the corresponding screw through a movable threaded hole arranged thereon, a positioning hole is provided on the workbench, a connecting block with a regular polygonal cross-sectional shape is provided in the positioning hole, the connecting block is connected to one end of the screw, a positioning block is inserted into the positioning hole, a notch is provided on the positioning block that matches the shape of the connecting block and the connecting block is clamped at the notch.

[0016] Preferably, in the hole-opening device for road construction blasting, the bottom wall of the aggregate box is funnel-shaped with the material guide hole as the center.

[0017] Preferably, in the hole-opening device for road construction blasting, a connecting frame is provided at the bottom of the aggregate box, a fourth connecting plate is provided on the material guide cylinder, and the fourth connecting plate is connected to the connecting frame by a plurality of second screws and second nuts.

[0018] The present invention includes at least the following beneficial effects: the aggregate box is lifted and arranged below the workbench, the guide cylinder is vertically inserted into the guide hole of the bottom wall of the aggregate box, a spiral drilling rod is rotatably inserted in the guide cylinder, the top of the spiral drilling rod is inserted into the aggregate box and is rotatably connected to the aggregate box, and the bottom extends out of the guide cylinder. The spiral drilling rod rotates and the aggregate box is lifted and lowered synchronously to drive the spiral drilling rod to lift and lower to realize drilling, and at the same time, the aggregate box drives the guide cylinder to descend synchronously, and the waste in the drilled hole enters the aggregate box along the spiral groove of the spiral drilling rod under the limiting action of the guide cylinder, thereby realizing the collection of waste, effectively preventing all drilling waste from piling up or spilling in the area around the drilled hole during the drilling process, avoiding waste covering the surrounding drilled holes, and reducing dust.

[0019] Other advantages, objectives and features of the present invention will be reflected in part from the following description and will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a schematic diagram of the main structure of a hole-opening device for road construction blasting in one technical solution of the present invention;

[0021] FIG2 is a schematic top view of a hole-opening device for road construction blasting according to one technical solution of the present invention;

[0022] FIG3 is a schematic diagram of the connection structure between the lifting plate and the first connecting plate in one technical solution of the present invention;

[0023] FIG4 is a schematic diagram of the connection structure between the third connecting plate and the side wall of the aggregate box in one technical solution of the present invention;

[0024] FIG5 is a schematic diagram showing the positional relationship between the screw and the positioning block in one technical solution of the present invention;

[0025] FIG6 is a schematic diagram showing the positional relationship between the notch of the positioning block and the connecting block in one technical solution of the present invention.

[0026] Among them, 1- workbench, 2- armrest, 3- first connecting plate, 4- lifting plate, 5- hydraulic cylinder, 6- driving motor, 7- positioning block, 8- material collection box, 9- spiral drilling rod, 10- connecting frame, 11- fourth connecting plate, 12- material guide cylinder, 13- third connecting plate, 14- protective plate, 15- connecting cylinder, 16- protective cylinder, 17- supporting leg, 18- moving hole, 19- lifting hole, 20- supporting plate, 21- second connecting plate, 22- slide groove, 23- connecting screw, 24- slider, 25- screw, 26- moving groove, 27- positioning hole, 28- connecting block, 29- notch. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below with reference to the embodiments so that those skilled in the art can implement the invention with reference to the description.

[0028] It should be understood that terms such as “having”, “including” and “comprising” used herein do not preclude the existence or addition of one or more other elements or combinations thereof.

[0029] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. The orientations or positional relationships indicated by the terms "transverse", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0030] As shown in FIG1 , the present application provides a hole-opening device for road construction blasting, comprising:

[0031] The workbench 1 has a plurality of supporting legs 17 provided thereunder;

[0032] A material collecting box 8 is arranged below the workbench 1 and is detachably connected to the workbench 1. A material guide hole is provided on the bottom wall of the material collecting box 8;

[0033] The material guide cylinder 12 is vertically inserted at the material guide hole and is detachably connected to the aggregate box 8. A spiral drilling rod 9 is rotatably inserted in the material guide cylinder 12. The top of the spiral drilling rod 9 is inserted into the aggregate box 8 and rotatably connected to the top wall of the aggregate box 8. It is also connected to the output shaft of the drive motor 6 located at the top of the aggregate box 8 and is driven to rotate by the drive motor 6. The bottom of the spiral drilling rod 9 extends out of the material guide cylinder 12. The spiral drilling rod 9 extending out of the material guide cylinder 12 is divided into a feeding part and a drilling part from top to bottom. The outer diameter of the feeding part is the same as the outer diameter of the spiral drilling rod 9 located in the material guide cylinder 12, and the outer diameter of the drilling part is not less than the outer diameter of the material guide cylinder 12.

[0034] The hole-opening device for road construction blasting provided by the present technical solution mainly consists of a workbench 1, a collection box 8 that is lifted and arranged below the workbench 1, and a vertical material guide cylinder 12 that is connected to the collection box 8. A plurality of support legs 17 for supporting the entire device are provided under the workbench 1. The collection box 8 is detachably connected to the workbench 1 for easy maintenance. A material guide hole is provided on the bottom wall of the collection box 8. The material guide hole is the inlet and outlet for waste materials to enter and exit the collection box 8. The material guide cylinder 12 is inserted in the material guide hole and is connected to the collection box 8 and is detachably connected to the collection box 8. A spiral drilling rod 9 is rotatably inserted in the material guide cylinder 12. The top of the spiral drilling rod 9 is inserted into the collection box 8 and is rotatably connected to the top wall of the collection box 8, and is connected to the output shaft of the drive motor 6 located at the top of the collection box 8. It is driven to rotate by the drive motor 6. A guide cylinder 12 extends from the bottom of 9 for drilling holes. The spiral drilling rod extending from the guide cylinder is divided into a feeding part and a drilling part from top to bottom. The outer diameter of the drilling part is not less than the outer diameter of the guide cylinder, and the drilling diameter is not less than the outer diameter of the guide cylinder, so that the guide cylinder and the spiral drilling rod can be inserted into the drilled hole to collect waste. The outer diameter of the feeding part is the same as the outer diameter of the spiral drilling rod located in the guide cylinder. The space corresponding to the feeding part between the guide and the drilling part is a temporary storage space for the drilled waste. The waste drilled by the drilling part first stays in the temporary storage space and then enters the aggregate box through the feeding part and the spiral drilling rod in the guide cylinder; in order to enable the waste to quickly enter the aggregate box along the spiral groove on the spiral drilling rod, the spiral groove on the spiral drilling rod is a variable pitch spiral groove, and the pitch of the spiral groove of the drilling part is smaller than the pitch of the spiral groove of the feeding part, the guide cylinder, and the aggregate box.

[0035] The method of using the hole-opening device for road construction blasting of the present technical solution is as follows: move the device to the position of the foundation to be drilled, rotate the spiral drilling rod 9 in the forward direction, and at the same time, lower the aggregate box 8 to drive the spiral drilling rod 9 and the guide barrel 12 to descend synchronously. The bottom of the spiral drilling rod 9 is first drilled into the foundation. As the drilling progresses, the guide barrel 12 follows the spiral drilling rod 9 and continues to go deeper into the drilled hole. The waste generated by the drilling enters the aggregate box 8 along the spiral groove of the spiral drilling rod 9 and under the limiting action of the guide barrel 12. When the aggregate box 8 is full, the guide barrel 12 can be disassembled from the aggregate box 8 first, and then the spiral drilling rod 9 can be rotated in the reverse direction to discharge the waste in the aggregate box 8. The hole-opening device for road construction blasting of the present technical solution can be positioned by pressurizing a fixing device or manually during use to prevent it from shifting due to vibration during the drilling process.

[0036] The present technical solution includes at least the following beneficial effects: the material collection box 8 is lifted and arranged below the workbench 1, the guide cylinder 12 is vertically inserted into the guide hole of the bottom wall of the material collection box 8, and a spiral drilling rod 9 is inserted and rotated in the guide cylinder 12. The top of the spiral drilling rod 9 is inserted into the material collection box 8 and is connected to the material collection box 8 for rotation, and the bottom extends out of the guide cylinder 12. The spiral drilling rod 9 rotates and the material collection box 8 is lifted and lowered synchronously to drive the spiral drilling rod 9 to lift and lower to achieve drilling. At the same time, the material collection box 8 drives the guide cylinder 12 to move downward synchronously. The waste in the drill hole flows down along the spiral groove of the spiral drilling rod 9 and enters the collection box 8 under the limiting action of the guide cylinder 12, so that the waste is collected and effectively prevents all the drilling waste from piling up or spilling in the area around the drill hole during the drilling process; the guide cylinder 12 is detachably connected to the collection box 8, and the collection box 8 is detachably connected to the workbench 1, which is convenient for the inspection and maintenance of various parts; the bottom of the spiral drilling rod 9 extends out of the guide cylinder 12, so that the spiral drilling rod 9 preferentially positions the drill hole to facilitate the insertion of the guide cylinder 12 into the drill hole.

[0037] In another technical solution, as shown in Figures 1, 2, and 4, in the hole-drilling device for road construction blasting, a support plate 20 is horizontally movable on the workbench 1, a hydraulic cylinder 5 is provided on the support plate 20, a horizontal lifting plate 4 is provided at the telescopic top end of the hydraulic cylinder 5, and vertical first connecting plates 3 are detachably provided at both ends of the lifting plate 4. The two first connecting plates 3 are respectively connected to the two side walls of the aggregate box 8 through the lifting holes 19 on the support plate 20. The hydraulic cylinder 5 vertically telescopes and drives the lifting plate 4 to rise and fall, thereby directly or indirectly driving the first connecting plates 3 and the aggregate box 8 to rise and fall; the support plate 20 is horizontally movable and arranged on the workbench 1 to facilitate adjustment of the horizontal position of the support plate 20 and thus the drilling position; the support plate 20 is provided with lifting holes 19 for each first connecting plate 3 to move through, which can limit the position of the first connecting plate 3 and prevent it from moving out of position or bending.

[0038] In another technical solution, as shown in Figure 3 , in the hole-drilling device for road construction blasting, the ends of the lifting plate 4 are bent downward to form vertical second connecting plates 21. The two first connecting plates 3 are positioned between the two second connecting plates 21 and are connected to the corresponding second connecting plates 21 via a plurality of first screws and first nuts. This allows the lifting plate 4 to directly apply some pressure to the first connecting plates 3, resulting in a stable structure and easy assembly and disassembly.

[0039] In another technical solution, as shown in Figures 1 and 4, in the hole-opening device for road construction blasting, the outer peripheral movable sleeve of the guide cylinder 12 is provided with a horizontal protective plate 14, and a plurality of vertical third connecting plates 13 are provided at both ends of the protective plate 14. The two side walls of the aggregate box 8 and the corresponding first connecting plates 3 are provided with a plurality of connected vertical slide grooves 22, and a slider 24 is provided in the slide groove 22, and the slider 24 is detachably connected to the top of the corresponding third connecting plate 13. The chute 22 on the side wall of the collecting box 8 and the chute 22 on the first connecting plate 3 are of the same size and are connected, so that the slider 24 can slide smoothly in the chute 22 and ensure sufficient sliding distance. As the guide cylinder 12 penetrates into the borehole, the protective plate 14 moves up relative to the guide cylinder 12 under the support of the foundation, and the slider 24 moves along the chute 22, which can prevent the protective plate 14 from shaking horizontally and causing collision damage to the guide cylinder 12; by disassembling the slider 24 and the third connecting plate 13, the protective plate 4 can be removed from the device; the protective plate 14 can prevent waste from splashing everywhere during drilling.

[0040] In another technical solution, as shown in FIG4 , in the hole-opening device for road construction blasting, the third connecting plate 13 is provided with a connecting hole, into which a connecting screw 23 is inserted, and the tail end of the connecting screw 23 is inserted into the connecting threaded hole on the slider 24 , making disassembly and assembly convenient.

[0041] In another technical solution, as shown in FIG1 , in the hole-drilling device for road construction blasting, a protective cylinder 16 is provided below the protective plate 14, around the periphery of the protective hole corresponding to the guide cylinder 12. A connecting cylinder 15 is provided above the protective plate 14, around the periphery of the protective hole. The connecting cylinder 15 is movably mounted around the periphery of the guide cylinder 12. The protective plate 14 is movably mounted around the periphery of the guide cylinder 12 through the protective hole. The protective cylinder 16 further reduces the range of waste material splashing during drilling. The connecting cylinder 15 can be configured as a frustum with a narrow top and a thick bottom. The inner diameter of the top of the connecting cylinder 15 is slightly larger than the outer diameter of the guide cylinder 12, allowing relative displacement between the two. The connecting cylinder 15 prevents waste material from splashing onto the protective plate 14 during the initial drilling process of the spiral drilling rod 9.

[0042] In another technical solution, as shown in Figures 2 and 5, in the hole-drilling device for road construction blasting, the workbench 1 is provided with a movable hole 18. A pair of horizontal movable grooves 26 are provided on the workbench 1 around the movable hole 18. The two side portions of the support plate 20 are respectively movable and inserted into the pair of movable grooves 26. The support plate 20 is pushed to move along the movable grooves 26 to adjust its horizontal position, thereby adjusting the drilling position.

[0043] In another technical solution, as shown in Figures 1, 2, 5 and 6, in the hole-opening device for road construction blasting, a horizontal screw 25 is rotatably arranged in the movable groove 26, and the support plate 20 is movably sleeved on the corresponding screw 25 through the movable threaded hole provided thereon. A positioning hole 27 is provided on the workbench 1, and a connecting block 28 with a regular polygonal cross-sectional shape is provided in the positioning hole 27. The connecting block 28 is connected to one end of the screw 25, and a positioning block 7 is inserted into the positioning hole 27. The positioning block 7 is provided with a notch 29 matching the shape of the connecting block 28 and the connecting block 28 is clamped at the notch 29. The rotation of the screw 25 drives the support plate 20 to move, and the movement of the support plate 20 can also drive the screw 25 to rotate and then drive the connecting block 28 to rotate. The positioning block 7 is used to prevent the rotation of the connecting block 28 and thus limit the rotation of the screw 25 to limit the horizontal position of the support plate 20; the more sides of the regular polygon and the closer it is to a circle, the easier it is for the connecting block 28 to break free from the constraints of the positioning block 7 and rotate, so the cross-section of the connecting block 28 is preferably a square, a regular hexagon, or an equilateral triangle.

[0044] In another technical solution, as shown in FIG1 , in the hole-opening device for road construction blasting, the bottom wall of the collecting box 8 is funnel-shaped with the guide hole as the center, so that the waste is concentrated at the guide hole by its own gravity, which facilitates the discharge of the waste.

[0045] In another technical solution, as shown in FIG1 , in the hole-drilling device for road construction blasting, a connecting frame 10 is provided at the bottom of the material collection box 8 , and a fourth connecting plate 11 is provided on the material guide cylinder 12 . The fourth connecting plate 11 is connected to the connecting frame 10 via a plurality of second screws and second nuts. A working space is provided on the connecting frame 10 for inserting operating tools, facilitating the installation and removal of the second screw and second nut structure, and thus the connecting frame 10 and fourth connecting plate 11, without damaging the material collection box 8 .

[0046] In another technical solution, as shown in Figures 1 and 2, in the hole-opening device for road construction blasting, a plurality of handrails 2 are provided on the workbench 1. The handrails 2 are provided for workers to hold and facilitate movement of the device.

[0047] The number of devices and processing scales described herein are intended to simplify the description of the present invention. Applications, modifications, and variations of the present invention will be readily apparent to those skilled in the art.

[0048] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A hole-opening device for road construction blasting, characterized in that: include: A workbench, with a plurality of supporting legs arranged underneath; A material collecting box is arranged under the workbench and is detachably connected to the workbench. A material guiding hole is arranged on the bottom wall of the material collecting box. A material guide cylinder is vertically inserted at the material guide hole and detachably connected to the material collection box, a spiral drilling rod is rotatably inserted in the material guide cylinder, the top of the spiral drilling rod is inserted into the material collection box and is rotatably connected to the top wall of the material collection box, and is connected to the output shaft of a driving motor located at the top of the material collection box and is driven to rotate by the driving motor, the bottom of the spiral drilling rod extends out of the material guide cylinder, and the spiral drilling rod extending out of the material guide cylinder is divided into a feeding part and a drilling part from top to bottom, the outer diameter of the feeding part is the same as the outer diameter of the spiral drilling rod located in the material guide cylinder, and the outer diameter of the drilling part is not less than the outer diameter of the material guide cylinder.

2. The hole-opening device for road construction blasting as claimed in claim 1, characterized in that: A support plate is provided on the workbench for horizontal movement, a hydraulic cylinder is provided on the support plate, a horizontal lifting plate is provided on the telescopic top end of the hydraulic cylinder, and vertical first connecting plates are detachably provided at both ends of the lifting plate. The two first connecting plates are respectively connected to the two side walls of the aggregate box through the lifting holes on the support plate.

3. The hole-opening device for road construction blasting as claimed in claim 2, characterized in that: Both ends of the lifting plate are bent downward to form vertical second connecting plates. The two first connecting plates are located between the two second connecting plates and are respectively connected to the corresponding second connecting plates through a plurality of first screws and first nut structures.

4. The hole-opening device for road construction blasting as claimed in claim 2, characterized in that: The outer peripheral movable sleeve of the material guide cylinder is provided with a horizontal protective plate, and multiple vertical third connecting plates are provided at both ends of the protective plate. Multiple connected vertical sliding grooves are provided on the two side walls of the collection box and the corresponding first connecting plates, and sliding blocks are provided in the sliding grooves. The sliding blocks are detachably connected to the tops of the corresponding third connecting plates.

5. The hole-opening device for road construction blasting as claimed in claim 4, characterized in that: The third connecting plate is provided with a connecting hole, a connecting screw is inserted into the connecting hole, and the tail end of the connecting screw is inserted into the connecting threaded hole on the sliding block.

6. The hole-opening device for road construction blasting as claimed in claim 4, characterized in that: A protective cylinder is arranged at the periphery of the protective hole corresponding to the material guiding cylinder below the protective plate, and a connecting cylinder is arranged at the periphery of the protective hole above the protective plate. The connecting cylinder is movably sleeved at the periphery of the material guiding cylinder.

7. The hole-opening device for road construction blasting as claimed in claim 1, characterized in that: The workbench is provided with a moving hole, and a pair of horizontal moving grooves are provided on the workbench around the moving hole. The two side portions of the support plate are respectively moved and inserted into the pair of moving grooves.

8. The hole-opening device for road construction blasting as claimed in claim 7, characterized in that: A horizontal screw is rotatably arranged in the movable groove, and the support plate is movably sleeved on the corresponding screw through a movable threaded hole arranged thereon. A positioning hole is arranged on the workbench, and a connecting block with a regular polygonal cross-sectional shape is arranged in the positioning hole. The connecting block is connected to one end of the screw, and a positioning block is inserted in the positioning hole. The positioning block is provided with a notch matching the shape of the connecting block so that the connecting block is clamped in the notch.

9. The hole-opening device for road construction blasting as claimed in claim 1, characterized in that: The bottom wall of the material collecting box is in a funnel shape with the material guiding hole as the center.

10. The hole-opening device for road construction blasting as claimed in claim 9, characterized in that: A connecting frame is arranged at the bottom of the material collecting box, a fourth connecting plate is arranged on the material guiding cylinder, and the fourth connecting plate is connected to the connecting frame through a plurality of second screws and second nut structures.

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