A rotary drilling rig for road construction

Abstract

The present invention relates to the field of soil layer drilling equipment, and particularly to a rotary drilling rig for road construction, which includes a drilling tool. The drilling tool includes a drill barrel, an inner spiral drill bit and an outer spiral drill bit. The drill barrel can rotate around its axis, and the inner spiral drill bit is coaxially and rotatably arranged inside the drill barrel. The inner spiral drill bit includes a plurality of first spiral plates and a central cylinder. The present invention is provided with an inner spiral drill bit. When the inner spiral drill bit is in the drilling state, a plurality of first spiral plates are connected to form a continuous auger helix. At this time, under the action of the auger helix, the soil is conveyed to the inside of the drill barrel by the auger helix. When the inside of the drill barrel is filled with soil, the inner spiral drill bit switches to the soil discharging state. At this time, a plurality of first spiral plates are all located on the same side in the circumferential direction of the drill barrel, that is, the overlapping area of the first spiral plates in the circumferential direction of the drill barrel reaches the maximum, which greatly increases the path for the soil to fall, making it easier for the soil inside the drill barrel to pour out from the inside of the drill barrel.

Description

Technical Field

[0001] The present invention relates to the technical field of soil layer drilling equipment, and particularly to a rotary drilling rig for road construction. Background Art

[0002] A rotary drilling rig, also known as a rotary drill, is a heavy mechanical equipment widely used in foundation construction such as pile foundation engineering. The rotary drilling rig mainly drives the drill pipe and the drill bit to rotate through a power head, breaks the soil or rock in the formation by cutting or excavating with the drill tool, and discharges the excavated soil out of the rotary hole.

[0003] The drill tool is the core component of the rotary drilling rig. It directly contacts the formation and is responsible for cutting, excavating, and removing soil or rock. A common type of drill tool is a barrel drill, which includes a cylindrical barrel with an open lower end and a spiral drill bit. The spiral drill bit is coaxially and fixedly arranged inside the cylindrical barrel. During drilling, the cylindrical barrel is mainly used for wall protection to prevent the hole wall from collapsing during drilling. The spiral drill bit is used to drill into the soil and convey the soil upward into the barrel. As the soil inside the barrel continuously increases and the spiral drill bit continues to rotate, the soil inside the barrel is gradually compacted and stored in the barrel. When the barrel is full of soil, the drill tool is removed from the soil layer, the drill tool is rotated in the reverse direction to pour out the soil inside it, and then the drill bit is extended into the soil again for drilling. When the barrel is full of soil, the drill tool is removed again to pour out the soil. However, such a drill tool has the following problems when rotary drilling a hole: In order to be able to rotate more soil into the barrel for compaction and storage, the spiral inclination angle of the spiral drill bit is often small. Therefore, when the drill tool rotates in the reverse direction, the efficiency of discharging the soil inside the barrel is low, and it takes a long time to completely discharge the soil inside the barrel. Summary of the Invention

[0004] Based on this, it is necessary to provide a rotary drilling rig for road construction aiming at the problems existing in the drill tool of the current rotary drilling rig, so as to solve the problem of low efficiency when the soil inside the barrel is completely discharged.

[0005] The above object is achieved by the following technical solutions:

[0006] A rotary drilling rig for road construction includes: a drill tool, and the drill tool includes:

[0007] A drill barrel that can rotate around its axis;

[0008] An inner spiral drill bit coaxially rotates inside the drill barrel. The inner spiral drill bit includes a first spiral plate and a central cylinder. There are multiple first spiral plates and multiple central cylinders. The multiple central cylinders are sequentially connected along the axis of the drill barrel, and adjacent two central cylinders can rotate relative to each other within a preset angle. The multiple first spiral plates correspond to the multiple central cylinders one by one and are respectively arranged on the outer peripheral walls of the corresponding central cylinders;

[0009] The outer spiral drill bit is coaxially and rotatably arranged inside the drill barrel, and the rotation direction of the outer spiral drill bit is opposite to that of the inner spiral drill bit. The outer spiral drill bit includes a second spiral plate and a rotating ring. There are multiple second spiral plates and multiple rotating rings. The multiple rotating rings are sequentially connected along the axis of the drill barrel, and two adjacent rotating rings can rotate relative to each other within a preset angle. The multiple second spiral plates correspond to the multiple rotating rings one by one and are respectively arranged on the outer peripheral walls of the corresponding rotating rings, and the spiral direction of the second spiral plate is opposite to that of the first spiral plate;

[0010] In the drilling state, the multiple first spiral plates and the multiple second spiral plates are all sequentially connected along their respective spiral lines to form a continuous auger spiral ring for conveying soil upward;

[0011] In the soil dumping state, the multiple first spiral plates and the multiple second spiral plates are all located on the same side in the circumferential direction of the drill barrel.

[0012] Preferably, a driving assembly is arranged inside the drill barrel, and the driving assembly is used to drive the inner spiral drill bit and the outer spiral drill bit to rotate in opposite directions.

[0013] Preferably, the driving assembly includes a driving source, a main shaft, a first gear, a planetary gear and a toothed ring. The driving source is arranged inside the drill barrel. The main shaft is fixedly connected to the output shaft of the driving source, and the main shaft is coaxially sleeved inside the central barrel. The main shaft and the lowermost central barrel can rotate synchronously. The first gear is coaxially arranged at the upper end of the uppermost central barrel. The planetary gear is rotatably arranged inside the drill barrel. The planetary gear meshes with the first gear. The toothed ring is arranged on the inner peripheral wall of the uppermost rotating ring, and the toothed ring meshes with the planetary gear.

[0014] Preferably, a first arc-shaped groove is formed on the lower end surface of the central barrel, and a first guide post is arranged on the upper end surface of the central barrel. Among two adjacent central barrels, the first guide post on the lower central barrel is slidably connected in the first arc-shaped groove on the upper central barrel.

[0015] Preferably, a second arc-shaped groove is formed on the lower end surface of the rotating ring, and a second guide post is arranged on the upper end surface of the rotating ring. Among two adjacent rotating rings, the second guide post on the lower rotating ring is slidably connected in the second arc-shaped groove on the upper rotating ring.

[0016] Preferably, the pitch of the auger spiral ring formed by connecting the multiple first spiral plates increases from bottom to top.

[0017] Preferably, the outer diameter of the auger spiral ring formed by connecting the multiple first spiral plates decreases from bottom to top.

[0018] Preferably, the pitch of the auger spiral ring formed by connecting the multiple second spiral plates decreases from bottom to top.

[0019] Preferably, the inner diameter of the auger spiral ring formed by connecting multiple said second spiral plates increases upward from bottom to top.

[0020] Preferably, a plurality of drilling teeth are circumferentially and equally spaced on the lower end face of the drill barrel.

[0021] The beneficial effects of the present invention are as follows:

[0022] 1. The present invention is provided with an inner spiral drill bit and an outer spiral drill bit. When the inner spiral drill bit and the outer spiral drill bit are in the drilling state, multiple first spiral plates are connected to form a continuous auger spiral, and multiple second spiral plates are also connected to form a continuous auger spiral. At this time, under the action of the auger spiral, the soil is transported by the auger spiral into the drill barrel. When the soil in the drill barrel is full, the inner spiral drill bit and the outer spiral drill bit switch to the soil discharging state. At this time, multiple first spiral plates and multiple second spiral plates are all on the same side in the circumferential direction of the drill barrel, that is, the overlapping area of the first spiral plate and the second spiral plate in the circumferential direction of the drill barrel reaches the maximum, which greatly increases the path for the soil to fall, making it easier for the soil in the drill barrel to pour out from the inside of the drill barrel.

[0023] 2. The present invention is provided with an inner spiral drill bit and an outer spiral drill bit. Since the rotation direction of the auger spiral ring formed by connecting the first spiral plates is opposite to the rotation direction of the auger spiral ring formed by connecting the second spiral plates and both are spiral upward, when the inner spiral drill bit and the outer spiral drill bit are in the drilling state, the friction between the soil transported by the first spiral plate and the soil transported by the second spiral plate helps the soil to be stably transported upward along the spiral line, preventing the soil transported by the first spiral plate and the second spiral plate from moving downward under the action of the self-gravity of the soil due to insufficient spiral lift. In addition, it can also promote the radial movement of the soil along the drill barrel, so as to increase the compactness of the soil inside the drill barrel, improve the soil storage capacity inside the drill barrel, and at the same time reduce the transfer frequency of the first spiral plate and the second spiral plate.

[0024] 3. The present invention is provided with an inner spiral drill bit and an outer spiral drill bit. When the inner spiral drill bit and the outer spiral drill bit are in the soil discharging state, since the rotation direction of the auger spiral formed by connecting the first spiral plate and the second spiral plate is opposite, the friction between the soil transported by the first spiral plate and the soil transported by the second spiral plate helps to accelerate the discharge of the soil inside the drill barrel to the outside. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of a drilling tool of a rotary drilling rig for road construction according to the present invention;

[0026] Figure 2 is a front view of a rotary drilling rig for road construction according to the present invention;

[0027] Figure 3 isFigure 2 Cross-sectional view A-A in

[0028] Figure 4 This is an exploded view of the drill tool in a rotary drilling rig for road construction according to the present invention;

[0029] Figure 5 is Figure 4 Schematic diagram of the enlarged structure at position B in

[0030] Figure 6 This is a schematic diagram of the structure of the inner spiral drill bit in a rotary drilling rig for road construction according to the present invention;

[0031] Figure 7 This is a schematic diagram of the drilling state of the inner spiral drill bit in a rotary drilling rig for road construction according to the present invention;

[0032] Figure 8 This is a schematic diagram of the soil dumping state of the inner spiral drill bit in a rotary drilling rig for road construction according to the present invention.

[0033] Wherein:

[0034] 100, drill barrel; 110, drilling teeth;

[0035] 200, inner spiral drill bit; 210, first spiral plate; 220, central cylinder; 221, first arc groove; 222, first guide post;

[0036] 300, outer spiral drill bit; 310, second spiral plate; 320, rotating ring; 321, second arc groove; 322, second guide post;

[0037] 400, drive assembly; 410, drive source; 420, main shaft; 430, first gear; 440, planetary gear; 450, gear ring. Detailed implementation manners

[0038] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following further details the present invention through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0039] The serial numbers assigned to the components in this text itself, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. The "connection" and "coupling" as mentioned in the present invention, unless otherwise specifically stated, both include direct and indirect connection (coupling). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0040] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0041] As Figures 1 to 8As shown in the figure, a rotary drilling rig for road construction includes a drilling tool. The drilling tool includes a drill barrel 100, an inner spiral drill bit 200, and an outer spiral drill bit 300. The drill barrel 100 can rotate around its axis. Specifically, the power end of the rotary drilling rig is coaxially connected to the drill barrel 100. The inner spiral drill bit 200 is coaxially rotatably arranged inside the drill barrel 100. The inner spiral drill bit 200 includes a first spiral plate 210 and a central cylinder 220. There are multiple first spiral plates 210 and multiple central cylinders 220. The multiple central cylinders 220 are sequentially connected along the axis of the drill barrel 100, and adjacent two central cylinders 220 can relatively rotate within a preset angle. The multiple first spiral plates 210 and the multiple central cylinders 220 correspond one by one and are respectively arranged on the outer peripheral walls of the corresponding central cylinders 220. The outer spiral drill bit 300 is coaxially rotatably arranged inside the drill barrel 100, and the rotation direction of the outer spiral drill bit 300 is opposite to that of the inner spiral drill bit 200. The outer spiral drill bit 300 includes a second spiral plate 310 and a rotating ring 320. There are multiple second spiral plates 310 and multiple rotating rings 320. The multiple rotating rings 320 are sequentially connected along the axis of the drill barrel 100, and adjacent two rotating rings 320 can relatively rotate within a preset angle range. The multiple second spiral plates 310 and the multiple rotating rings 320 correspond one by one and are respectively arranged on the outer peripheral walls of the corresponding rotating rings 320, and the spiral direction of the second spiral plate 310 is opposite to that of the first spiral plate 210. When the drilling tool is in the drilling state, the multiple first spiral plates 210 and the multiple second spiral plates 310 are all sequentially connected along their respective helical lines to form a continuous auger spiral ring for conveying soil upward. When the drilling tool is in the soil dumping state, the multiple first spiral plates 210 and the multiple second spiral plates 310 are all located on the same side in the circumferential direction of the drill barrel 100.

[0042] When the drilling tool drills into the soil, start the rotary drilling rig. The power end of the rotary drilling rig drives the drill barrel 100 to rotate circumferentially and move downward along its axis. At the same time, the drilling tool is in the drilling state. At this time, multiple first spiral plates 210 and multiple second spiral plates 310 are sequentially connected along their respective helical lines to form a continuous auger spiral ring. Under the action of the auger spiral ring, the soil is dug by the auger spiral ring and conveyed upward along its helical line. Finally, the soil is stored inside the drill barrel 100. Since the rotation direction of the auger spiral ring formed by the first spiral plates 210 is opposite to that of the auger spiral ring formed by the second spiral plates 310 and both are helically upward, the frictional force between the soil conveyed by the first spiral plates 210 and the soil conveyed by the second spiral plates 310 helps the soil to be stably conveyed upward along the helical line, preventing the soil conveyed by the first spiral plates 210 and the second spiral plates 310 from moving downward under the action of the soil's own gravity. In addition, since the rotation direction of the auger spiral ring formed by the first spiral plates 210 is opposite to that of the auger spiral ring formed by the second spiral plates 310 and both are helically upward, it can promote the radial movement of the soil along the drill barrel 100, so as to increase the compactness of the soil inside the drill barrel 100, improve the soil storage capacity inside the drill barrel 100, and at the same time reduce the transfer frequency of the first spiral plates 210 and the second spiral plates 310.

[0043] When the soil inside the drill barrel 100 is full, the rotary drilling rig drives the drill barrel 100 to move upward so that the drilling tool is removed from the pile hole. Next, the drilling tool is in the soil-dumping state. At this time, multiple first spiral plates 210 and multiple second spiral plates 310 are all on the same side in the circumferential direction of the drill barrel 100, that is, the overlapping area of the first spiral plates 210 and the second spiral plates 310 in the circumferential direction of the drill barrel 100 reaches the maximum. This greatly increases the path for the soil to fall, making it easier for the soil inside the drill barrel 100 to be poured out of the drill barrel 100, which is beneficial to improving the soil discharge efficiency. In addition, similarly, since the rotation direction of the auger spiral formed by the first spiral plates 210 and the second spiral plates 310 is opposite, the frictional force between the soil conveyed by the first spiral plates 210 and the soil conveyed by the second spiral plates 310 helps to accelerate the discharge of the soil inside the drill barrel 100 outward. After the soil inside the drill barrel 100 is completely poured out, the rotary drilling rig is used to control the drill barrel 100 to extend into the pile hole for rotary drilling operation. When the soil inside the drill barrel 100 is full, the drill barrel 100 is also removed from the pile hole, and then the drilling tool is switched to the soil-discharging state. Next, the above operations are repeated until the pile hole is drilled to the preset depth.

[0044] It should also be added that, as Figures 4 - 6As shown in the figure, to enable relative movement between two adjacent central cylinders 220 within a preset angle, specifically, a first arc-shaped groove 221 is formed on the lower end surface of the central cylinder 220, and a first guide post 222 is provided on the upper end surface of the central cylinder 220. Among two adjacent central cylinders 220, the first guide post 222 on the lower central cylinder 220 is slidably connected to the first arc-shaped groove 221 on the upper central cylinder 220. Similarly, to enable relative movement between two adjacent rotating rings 320 within a preset angle, specifically, a second arc-shaped groove 321 is formed on the lower end surface of the rotating ring 320, and a second guide post 322 is provided on the upper end surface of the rotating ring 320. Among two adjacent rotating rings 320, the second guide post 322 on the lower rotating ring 320 is slidably connected to the second arc-shaped groove 321 on the upper rotating ring 320.

[0045] In this embodiment, as Figure 3 and Figure 4 shown, a driving assembly 400 is provided inside the drill pipe 100. The driving assembly 400 is used to drive the inner spiral drill bit 200 and the outer spiral drill bit 300 to rotate in opposite directions. The driving assembly 400 includes a driving source 410, a main shaft 420, a first gear 430, a planetary gear 440, and a toothed ring 450. The driving source 410 is arranged inside the drill pipe 100. The driving source 410 is a servo motor. The main shaft 420 is fixedly connected to the output shaft of the driving source 410, and the main shaft 420 is coaxially sleeved inside the central cylinder 220. The main shaft 420 and the lowermost central cylinder 220 can rotate synchronously. The first gear 430 is coaxially arranged at the upper end of the uppermost central cylinder 220. The planetary gear 440 is rotatably arranged inside the drill pipe 100. The planetary gear 440 meshes with the first gear 430. The toothed ring 450 is arranged on the inner peripheral wall of the uppermost rotating ring 320. The toothed ring 450 meshes with the planetary gear 440.

[0046] In the initial state, the inner spiral drill bit 200 and the outer spiral drill bit 300 are in the drilling state. When drilling into the soil layer, the drive source 410 is started. Under the action of the drive source 410, the main shaft 420 rotates synchronously with the output shaft of the drive source 410. At this time, the main shaft 420 drives the lowermost central cylinder 220 to rotate circumferentially. The lowermost central cylinder 220 pushes against the groove wall of the first arc-shaped groove 221 through the first guide post 222, so that the lowermost central cylinder 220 and the adjacent central cylinder 220 rotate synchronously. Similarly, under the guiding and matching action of other first guide posts 222 and the corresponding first arc-shaped grooves 221, multiple central cylinders 220 rotate synchronously in the circumferential direction. At this time, the auger spiral ring formed by connecting multiple first spiral plates 210 is forced to rotate circumferentially, and the soil is dug by the auger spiral ring and transported upward along its spiral line and stored inside the drill cylinder 100. At the same time, after the uppermost central cylinder 220 rotates circumferentially, it drives the first gear 430 to rotate synchronously. The first gear 430 drives the toothed ring 450 to rotate circumferentially through the planetary gear 440. Since the toothed ring 450 is arranged on the inner peripheral wall of the uppermost rotating ring 320, the uppermost rotating ring 320 is forced to rotate circumferentially. Similarly, under the cooperation of the second guide post 322 and the corresponding second arc-shaped groove 321, multiple rotating rings 320 rotate synchronously in the circumferential direction. Then, the auger spiral ring formed by connecting multiple second spiral plates 310 is forced to rotate circumferentially. Under the action of the auger spiral ring, the soil is dug by the auger spiral ring and transported upward along its spiral line and finally stored inside the drill cylinder 100.

[0047] When the soil inside the drill barrel 100 is full, the drill tool is then removed from the pile hole. Next, the drill tool is put into the state of dumping soil. Specifically, the drive source 410 is activated to rotate in the reverse direction. Under the driving action of the drive source 410, the main shaft 420 rotates synchronously with the output shaft of the drive source 410. At this time, the main shaft 420 drives the lowermost central cylinder 220 to rotate circumferentially. After the first guide post 222 of the lowermost central cylinder 220 slides until it abuts against the other side wall of the first arc-shaped groove 221 of the adjacent central cylinder 220, the lowermost central cylinder 220 and the adjacent central cylinder 220 rotate synchronously. At this time, the two central cylinders 220 rotate relative to each other by a preset angle, and the first spiral plates 210 corresponding to the two central cylinders 220 are both located on the same side in the circumferential direction of the drill barrel 100, and the overlapping area of the first spiral plates 210 corresponding to the two central cylinders 220 in their circumferential directions reaches the maximum. Similarly, through the mutual cooperation of other first arc-shaped grooves 221 and the corresponding first guide posts 222, the first spiral plates 210 corresponding to all the central cylinders 220 are rotated to the same side in the circumferential direction of the drill barrel 100, so that the overlapping areas of the first spiral plates 210 corresponding to multiple central cylinders 220 in the circumferential direction of the drill barrel 100 all reach the maximum, thereby greatly increasing the path for the soil to fall, making the soil in the area of the first spiral plate 210 easier to be poured out from the inside of the drill barrel 100, and thus improving the soil discharging efficiency of the drill tool. Next, the drill barrel 100 is rotated at a low speed until the soil inside the drill barrel 100 is completely discharged.

[0048] Similarly, after the uppermost central cylinder 220 rotates in the reverse direction, it drives the first gear 430 to rotate synchronously. The first gear 430 drives the gear ring 450 to rotate circumferentially through the planetary gear 440. Since the gear ring 450 is arranged on the inner peripheral wall of the uppermost rotating ring 320, the uppermost rotating ring 320 rotates synchronously in the reverse direction. Similarly, after the second guide post 322 corresponding to the uppermost rotating ring 320 rotates until it abuts against the other side wall of the second arc-shaped groove 321 of the adjacent rotating ring 320, the two rotating rings 320 rotate relative to each other by a preset angle. At this time, the second spiral plates 310 corresponding to the two rotating rings 320 are both located on the same side of the circumference of the drill barrel 100, and the overlapping area of the second spiral plates 310 corresponding to the two rotating rings 320 in their circumferential directions reaches the maximum. Similarly, through the mutual cooperation of other second arc-shaped grooves 321 and the corresponding second guide posts 322, the second spiral plates 310 corresponding to all the rotating rings 320 are located on the same side of the circumference of the drill barrel 100, so that the overlapping areas of the second spiral plates 310 corresponding to all the rotating rings 320 in their circumferential directions reach the maximum, thereby increasing the path for the soil to fall and making the soil in the area of the second spiral plate 310 easier to be discharged from the drill barrel 100.

[0049] In this embodiment, as Figure 3 andFigure 7 As shown, the pitch of the auger spiral ring formed by connecting multiple first spiral plates 210 increases from bottom to top.

[0050] Such a setting enables the lower part of the first spiral plate 210 to more easily rotate and dig the soil and convey it upward, and the increasing pitch of the first spiral plate 210 from bottom to top is also beneficial for transferring the soil from the area where the first spiral plate 210 is located to the area where the second spiral plate 310 is located, so as to reduce the resistance when the inner spiral drill bit 200 rotates circumferentially.

[0051] In this embodiment, the outer diameter of the auger spiral ring formed by connecting multiple first spiral plates 210 decreases from bottom to top.

[0052] It can be understood that the lower part of the first spiral plate 210 is in direct contact with the soil, and it is responsible for the rotary digging operation of the soil. Maximizing the diameter of the lower part of the first spiral plate 210 is beneficial to improving the rotary digging efficiency, while reducing the diameter of the upper part of the first spiral plate 210 can reduce the amount of soil stored in the area where the first spiral plate 210 is located, which is beneficial to reducing the resistance when the inner spiral drill bit 200 rotates and preventing the inner spiral drill bit 200 from getting stuck during the rotary digging operation.

[0053] In this embodiment, as Figure 3 and Figure 4 shown, the pitch of the auger spiral ring formed by connecting multiple second spiral plates 310 decreases from bottom to top.

[0054] Such a setting enables more soil to be stored in the upper area of the second spiral plate 310, while reducing the contact area between the lower part of the second spiral plate 310 and the soil and reducing the rotational resistance of the auger spiral ring formed by connecting the second spiral plates 310.

[0055] It can be understood that the reason for storing more soil in the area where the second spiral plate 310 is located is that after being decelerated by the planetary gear 440, the rotational torque of the second spiral plate 310 is greater than that of the first spiral plate 210, so the second spiral plate 310 can bear a greater load.

[0056] In this embodiment, as Figure 3 and Figure 4 shown, the inner diameter of the auger spiral ring formed by connecting multiple second spiral plates 310 increases from bottom to top.

[0057] Such a setting is beneficial for the soil in the area of the second spiral plate 310 to be gradually compacted, so as to store more soil in the area where the second spiral plate 310 is located.

[0058] In this embodiment, as Figure 1 shown, a plurality of drilling teeth 110 are circumferentially and equally spaced on the lower end surface of the drill barrel 100.

[0059] Such a setting is beneficial to reducing the resistance when the drill pipe 100 drills into the soil.

[0060] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0061] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A rotary drilling rig for road construction, characterized in that: include: Drilling tools include: a drill barrel, which is capable of rotating about its axis; An inner spiral drill bit is coaxially rotatable in a drill barrel, and includes a first spiral plate and a center barrel. There are multiple first spiral plates and multiple center barrels, and the multiple center barrels are sequentially connected along the axis of the drill barrel, and two adjacent center barrels can rotate relative to each other within a preset angle. The multiple first spiral plates correspond to the multiple center barrels one by one and are respectively arranged on the outer peripheral walls of the corresponding center barrels. An outer spiral drill bit is coaxially rotatable in the drill barrel, and the outer spiral drill bit rotates in opposite directions to the inner spiral drill bit. The outer spiral drill bit includes a second spiral plate and a rotating ring. There are multiple second spiral plates and multiple rotating rings, which are sequentially connected along the axis of the drill barrel, and two adjacent rotating rings can rotate relative to each other within a preset angle. The multiple second spiral plates correspond to the multiple rotating rings one by one and are respectively arranged on the outer peripheral walls of the corresponding rotating rings, and the second spiral plates have opposite rotation directions to the first spiral plates. In the drilling state, the plurality of first spiral plates and the plurality of second spiral plates are sequentially connected along their own spiral lines to form a continuous auger spiral ring for conveying soil upward; In the soil dumping state, the plurality of first spiral plates and the plurality of second spiral plates are all located on the same side of the drill tube in the circumferential direction.

2. A rotary drilling rig for road construction according to claim 1, characterized in that: A driving assembly is arranged inside the drill barrel, and the driving assembly is used to drive the inner spiral drill bit and the outer spiral drill bit to rotate in opposite directions.

3. A rotary drilling rig for road construction according to claim 2, characterized in that: The driving assembly includes a driving source, a main shaft, a first gear, a planetary gear and a gear ring. The driving source is arranged inside the drill barrel. The main shaft is fixedly connected to the output shaft of the driving source and is coaxially sleeved inside the center tube. The main shaft and the lowermost center tube can rotate synchronously. The first gear is coaxially arranged at the upper end of the uppermost center tube. The planetary gear is rotatably arranged in the drill barrel. The planetary gear is meshed with the first gear. The gear ring is arranged on the inner circumferential wall of the uppermost rotating ring and is meshed with the planetary gear.

4. A rotary drilling rig for road construction according to claim 1, characterized in that: The lower end surface of the central tube is provided with a first arc groove, and the upper end surface of the central tube is provided with a first guide column. In two adjacent central tubes, the first guide column on the lower central tube is slidably connected in the first arc groove on the upper central tube.

5. A rotary drilling rig for road construction according to claim 1, characterized in that: The lower end surface of the rotating ring is provided with a second arc groove, and the upper end surface of the rotating ring is provided with a second guide column. Among the two adjacent rotating rings, the second guide column on the lower rotating ring is slidably connected in the second arc groove of the upper rotating ring.

6. A rotary drilling rig for road construction according to claim 1, characterized in that: The pitch of the auger spiral ring formed by connecting a plurality of the first spiral plates increases from bottom to top.

7. A rotary drilling rig for road construction according to claim 1, characterized in that: The outer diameter of the auger spiral ring formed by connecting a plurality of the first spiral plates decreases from bottom to top.

8. A rotary drilling rig for road construction according to claim 1, characterized in that: The pitch of the auger spiral ring formed by connecting a plurality of the second spiral plates decreases from bottom to top.

9. A rotary drilling rig for road construction according to claim 1, characterized in that: The inner diameter of the auger spiral ring formed by connecting a plurality of the second spiral plates increases from bottom to top.

10. A rotary drilling rig for road construction according to claim 1, characterized in that: The lower end surface of the drill tube is provided with a plurality of drilling teeth at equal intervals in the circumferential direction.

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