Rotary drilling rig for road construction

Abstract

The invention relates to the field of soil layer drilling equipment, in particular to a rotary drilling rig for road construction, which comprises a drilling tool, the drilling tool comprises a drilling barrel, an inner spiral drill bit and an outer spiral drill bit, the drilling barrel can rotate around the axis of the drilling barrel, the inner spiral drill bit is coaxially and rotatably arranged in the drilling barrel, and the inner spiral drill bit comprises a first spiral plate and a central barrel; the number of the first spiral plates and the number of the center cylinders are both multiple. An inner spiral drill bit is arranged, when the inner spiral drill bit is in a drilling state, a plurality of first spiral plates are connected to form a coherent auger spiral, at the moment, under the action of the auger spiral, soil is conveyed into a drill barrel through the auger spiral, and after the drill barrel is full of the soil, the inner spiral drill bit is switched to a soil discharging state; at the moment, the multiple first spiral plates are all located on the same side in the circumferential direction of the drilling barrel, that is, the overlapping area of the first spiral plates in the circumferential direction of the drilling barrel reaches the maximum, in this way, the soil falling path is greatly increased, and soil in the drilling barrel can be poured out from the interior of the drilling barrel more easily.

Description

Technical Field

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

[0002] A rotary drilling rig, also known as a rotary drilling rig, is a heavy-duty mechanical equipment widely used in foundation construction such as pile foundation engineering. The rotary drilling rig mainly drives the drill rod and the drill bit to rotate through the power head, and uses the cutting or excavation of the drill tool to break the soil or rock in the stratum, and discharge the excavated soil out of the rotary drilling hole.

[0003] The drill tool is the core component of the rotary drilling rig. It is in direct contact with the stratum and is responsible for cutting, digging and removing soil or rocks. The common type of drill tool is the barrel drill, which includes a cylindrical barrel with an opening at the lower end and a spiral drill bit. The spiral drill bit is coaxially fixed 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 transport the soil upward to the inside of the barrel. As the soil inside the barrel continues to increase and the spiral drill bit continues to rotate, the soil inside the barrel is gradually compacted and stored in the barrel. When the soil inside the barrel is full, the drill tool is removed from the soil layer, causing the drill tool to rotate in the opposite direction to pour out the soil inside. Next, the drill bit continues to be extended into the soil for drilling. After the soil inside the barrel is full, the drill tool is continued to be removed to pour out the soil. However, this type of drilling tool has the following problems when rotary drilling: in order to be able to screw more soil into the cylinder for compaction and storage, the spiral inclination angle of the spiral drill bit is often small. Therefore, when the drilling tool rotates in the opposite direction, the efficiency of discharging the soil inside the cylinder is low, and it takes a long time to completely discharge the soil inside the cylinder. Summary of the invention

[0004] Based on this, it is necessary to provide a rotary drilling rig for road construction to solve the problem of low efficiency when the soil inside the cylinder is completely removed in view of the problems existing in the drilling tools of the current rotary drilling rig.

[0005] The above purpose is achieved through the following technical solutions: A rotary drilling rig for road construction comprises: a drilling tool, the drilling tool comprises: 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.

[0006] Preferably, a driving assembly is provided 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.

[0007] Preferably, 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 the main shaft 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 the gear ring is meshed with the planetary gear.

[0008] Preferably, a first arc groove is formed on the lower end surface of the center tube, and a first guide column is provided on the upper end surface of the center tube. In two adjacent center tubes, the first guide column on the lower center tube is slidably connected in the first arc groove on the upper center tube.

[0009] Preferably, a second arc groove is formed on the lower end surface of the rotating ring, and a second guide column is provided on the upper end surface of the rotating ring. 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.

[0010] Preferably, the pitch of the auger spiral ring formed by connecting a plurality of the first spiral plates increases from bottom to top.

[0011] Preferably, the outer diameter of the auger spiral ring formed by connecting a plurality of the first spiral plates decreases from bottom to top.

[0012] Preferably, the pitch of the auger spiral ring formed by connecting a plurality of the second spiral plates decreases from bottom to top.

[0013] Preferably, the inner diameter of the auger spiral ring formed by connecting a plurality of the second spiral plates increases from bottom to top.

[0014] Preferably, a plurality of drilling teeth are provided at equal intervals in the circumferential direction on the lower end surface of the drill tube.

[0015] The beneficial effects of the present invention are: 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 a drilling state, a plurality of first spiral plates are connected to form a continuous auger spiral, and a plurality of 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 to the inside of the drill barrel by the auger spiral. When the soil inside the drill barrel is full, the inner spiral drill bit and the outer spiral drill bit are switched to a soil discharge state. At this time, the plurality of first spiral plates and the plurality of second spiral plates are all located on the same side of the drill barrel in the circumferential direction, that is, the overlapping area of ​​the first spiral plates and the second spiral plates in the circumferential direction of the drill barrel is maximized, which greatly increases the path for the soil to fall, making it easier for the soil inside the drill barrel to be poured out from the inside of the drill barrel.

[0016] 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 plate is opposite to the rotation direction of the auger spiral ring formed by connecting the second spiral plate and both are spirally upward, when the inner spiral drill bit and the outer spiral drill bit are in a drilling state, the friction between the soil transported by the first spiral plate and the soil transported by the second spiral plate helps to stably transport the soil 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 soil's own gravity 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, increase the soil storage capacity in the drill barrel, and reduce the transfer frequency of the first spiral plate and the second spiral plate.

[0017] 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 a soil discharge state, since the rotation directions of the auger spiral formed by connecting the first spiral plate and the second spiral plate are 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 in the drill barrel to the outside. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the drilling tool structure of a rotary drilling rig for road construction according to the present invention; Figure 2 It is a front view of a rotary drilling rig for road construction of the present invention; Figure 3 for Figure 2 Middle AA section view; Figure 4 This is an exploded view of a drilling tool in a rotary drilling rig for road construction according to the present invention; Figure 5 for Figure 4 Schematic diagram of the enlarged structure at B in the middle; Figure 6 It is a schematic structural diagram of an inner spiral drill bit in a rotary drilling rig for road construction according to the present invention; Figure 7 It is a schematic diagram of the drilling state of an inner spiral drill bit in a rotary drilling rig for road construction of the present invention; Figure 8 The present invention is a schematic diagram of the soil pouring state of the inner spiral drill bit in the rotary drilling rig for road construction.

[0019] in: 100, drill tube; 110, drilling teeth; 200, inner spiral drill bit; 210, first spiral plate; 220, center tube; 221, first arc groove; 222, first guide column; 300, external spiral drill bit; 310, second spiral plate; 320, rotating ring; 321, second arc groove; 322, second guide column; 400, driving assembly; 410, driving source; 420, main shaft; 430, first gear; 440, planetary gear; 450, gear ring. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below 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.

[0021] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which 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 therefore cannot be understood as a limitation to the present invention.

[0022] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean 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, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0023] like Figures 1 to 8 As shown, a rotary drilling rig for road construction includes a drilling tool, which 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, and the inner spiral drill bit 200 is coaxially rotatable in the drill barrel 100. The inner spiral drill bit 200 includes a first spiral plate 210 and a center barrel 220. There are multiple first spiral plates 210 and multiple center barrels 220. The multiple center barrels 220 are connected in sequence along the axis of the drill barrel 100, and two adjacent center barrels 220 can rotate relative to each other within a preset angle. The multiple first spiral plates 210 correspond to the multiple center barrels 220 one by one and are respectively arranged on the outer peripheral walls of the corresponding center barrels 220. The outer spiral drill bit 300 is coaxially rotatable in the drill barrel 100, and the outer spiral drill bit 300 and the inner spiral drill bit 20 0, the external 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 connected in sequence along the axis of the drill tube 100, and two adjacent rotating rings 320 can rotate relative to each other within a preset angle range, the multiple second spiral plates 310 correspond to the multiple rotating rings 320 one by one and are respectively arranged on the outer peripheral walls of the corresponding rotating rings 320, and the second spiral plate 310 has an opposite rotation direction to the first spiral plate 210, when the drill tool is in the drilling state, the multiple first spiral plates 210 and the multiple second spiral plates 310 are sequentially connected along their own spiral lines to form a continuous auger spiral ring for conveying soil upward, and when the drill tool is in the soil dumping state, the multiple first spiral plates 210 and the multiple second spiral plates 310 are located on the same side of the drill tube 100 in the circumferential direction.

[0024] When the drill tool drills into the soil, the rotary drilling rig is started, and 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 drill tool is in a drilling state. At this time, multiple first spiral plates 210 and multiple second spiral plates 310 are sequentially connected along their own spiral lines to form a continuous auger spiral ring. Under the action of the auger spiral ring, the soil is rotary dug by the auger spiral ring and transported upward along its spiral line. Finally, the soil is stored in the drill barrel 100. Since the rotation direction of the auger spiral ring connected by the first spiral plate 210 is opposite to the rotation direction of the auger spiral ring connected by the second spiral plate 310 and both are spirally upward, at this time, the soil transported by the first spiral plate 210 and The friction between the soil transported by the second spiral plate 310 helps to stably transport the soil upward along the spiral line, preventing the soil transported by the first spiral plate 210 and the second spiral plate 310 from moving downward under the action of the soil's own gravity due to insufficient spiral lift. In addition, since the rotation direction of the auger spiral ring formed by the first spiral plate 210 is opposite to the rotation direction of the auger spiral ring formed by the second spiral plate 310 and both are spirally upward, the radial movement of the soil along the drill barrel 100 can be promoted, so as to increase the compactness of the soil inside the drill barrel 100, increase the soil storage capacity in the drill barrel 100, and reduce the transportation frequency of the first spiral plate 210 and the second spiral plate 310.

[0025] When the soil inside the drill tube 100 is full, the drill tube 100 is driven upward by the rotary drilling rig to move the drill tool out of the pile hole, and then the drill tool is put into a soil dumping state. At this time, the plurality of first spiral plates 210 and the plurality of second spiral plates 310 are all located on the same side of the drill tube 100 in the circumferential direction, that is, the overlapping area of ​​the first spiral plates 210 and the second spiral plates 310 in the circumferential direction of the drill tube 100 is maximized, which greatly increases the path for the soil to fall, making it easier for the soil inside the drill tube 100 to be dumped out from the inside of the drill tube 100, which is beneficial to improving the soil discharge efficiency. In addition, in the same way, due to the first The rotation directions of the auger spirals formed by connecting the spiral plate 210 and the second spiral plate 310 are opposite, so the friction between the soil transported by the first spiral plate 210 and the soil transported by the second spiral plate 310 helps to accelerate the discharge of the soil in the drill barrel 100. After the soil inside the drill barrel 100 is completely poured out, the drill barrel 100 is controlled by the rotary drilling rig to extend into the pile hole for rotary drilling. After 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 discharge state, and then the above operation is repeated until the pile hole is rotary drilled to a preset depth.

[0026] It should also be noted that if Figure 4-Figure 6As shown, in order to enable two adjacent center tubes 220 to move relative to each other within a preset angle, specifically, a first arc groove 221 is provided on the lower end surface of the center tube 220, and a first guide column 222 is provided on the upper end surface of the center tube 220. Among the two adjacent center tubes 220, the first guide column 222 on the lower center tube 220 is slidably connected in the first arc groove 221 on the upper center tube 220. Similarly, in order to enable two adjacent rotating rings 320 to move relative to each other within a preset angle, specifically, a second arc groove 321 is provided on the lower end surface of the rotating ring 320, and a second guide column 322 is provided on the upper end surface of the rotating ring 320. Among the two adjacent rotating rings 320, the second guide column 322 on the lower rotating ring 320 is slidably connected in the second arc groove 321 of the upper rotating ring 320.

[0027] In this embodiment, if Figure 3 and Figure 4 As shown, a driving assembly 400 is provided inside the drill barrel 100, and 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 gear ring 450. The driving source 410 is arranged inside the drill barrel 100, and 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 center tube 220. The main shaft 420 and the lowermost center tube 220 can rotate synchronously. The first gear 430 is coaxially arranged at the upper end of the uppermost center tube 220. The planetary gear 440 is rotatably arranged in the drill barrel 100, and the planetary gear 440 is meshed with the first gear 430. The gear ring 450 is arranged on the inner circumferential wall of the uppermost rotating ring 320, and the gear ring 450 is meshed with the planetary gear 440.

[0028] In the initial state, the inner spiral drill bit 200 and the outer spiral drill bit 300 are in a drilling state. When drilling into the soil layer, the driving source 410 is started. Under the action of the driving source 410, the main shaft 420 rotates synchronously with the output shaft of the driving source 410. At this time, the main shaft 420 drives the lowest center tube 220 to rotate circumferentially. The lowest center tube 220 pushes the groove wall of the first arc groove 221 through the first guide column 222, so that the lowest center tube 220 and the center tube 220 adjacent to it rotate synchronously. Similarly, under the guiding cooperation of other first guide columns 222 and corresponding first arc grooves 221, multiple center tubes 220 rotate synchronously. At this time, the auger spiral ring formed by connecting multiple first spiral plates 210 is forced to rotate circumferentially, and the soil is excavated by the auger spiral ring and transported upward along its spiral line and stored in the drill barrel 100. At the same time, the top center tube 220 rotates circumferentially and 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 circumferential wall of the top rotating ring 320, the top rotating ring 320 is forced to rotate circumferentially. Similarly, under the cooperation of the second guide column 322 and the corresponding second arc groove 321, the multiple rotating rings 320 rotate circumferentially synchronously, so the auger spiral ring connected by the multiple second spiral plates 310 is forced to rotate circumferentially. Under the action of the auger spiral ring, the soil is excavated by the auger spiral ring and transported upward along its spiral line and finally stored in the drill barrel 100.

[0029] When the soil inside the drill tube 100 is full, the drill tool is removed from the pile hole, and then the drill tool is put into a soil pouring state. Specifically, the driving source 410 is started to rotate in the opposite direction. Under the driving action of the driving source 410, the main shaft 420 rotates synchronously with the output shaft of the driving source 410. At this time, the main shaft 420 drives the lowermost center tube 220 to rotate circumferentially. After the first guide column 222 of the lowermost center tube 220 slides to abut against the other side groove wall of the first arc groove 221 of the adjacent center tube 220, the lowermost center tube 220 and the adjacent center tube 220 rotate synchronously. At this time, the two center tubes 220 rotate relative to each other by a preset angle, and the first spiral plates 210 corresponding to the two center tubes 220 are both located in the drill tube. On the same side of the drill barrel 100 in the circumferential direction, the overlapping area of ​​the first spiral plates 210 corresponding to the two center barrels 220 in the circumferential direction reaches the maximum. Similarly, through the cooperation of other first arc grooves 221 and the corresponding first guide columns 222, the first spiral plates 210 corresponding to all the center barrels 220 are rotated to the same side of the drill barrel 100 in the circumferential direction, so that the overlapping area of ​​the first spiral plates 210 corresponding to multiple center barrels 220 in the circumferential direction of the drill barrel 100 is maximized, thereby greatly increasing the path for soil to fall, making it easier for the soil in the area of ​​the first spiral plates 210 to be poured out from the inside of the drill barrel 100, thereby improving the soil discharge efficiency of the drilling tool, and then the drill barrel 100 is rotated at a low speed until the soil in the drill barrel 100 is completely discharged.

[0030] Similarly, the top central tube 220 rotates in the opposite direction and 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 circumferential wall of the top rotating ring 320, the top rotating ring 320 rotates in the opposite direction synchronously. Similarly, after the second guide column 322 corresponding to the top rotating ring 320 rotates to abut against the other side groove wall of the second arc groove 321 of the rotating ring 320 adjacent to it, the two rotating rings 320 rotate relative to each other by a preset angle. At this time, the second spiral plates 322 corresponding to the two rotating rings 320 are 10 are all 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 the circumferential direction is maximized. Similarly, through the cooperation of the other second arc grooves 321 and the corresponding second guide columns 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 area of ​​the second spiral plates 310 corresponding to all the rotating rings 320 in the circumferential direction is maximized, thereby increasing the path for soil to fall, making it easier for the soil in the second spiral plate 310 area to be discharged from the drill barrel 100.

[0031] In this embodiment, if Figure 3 and Figure 7 As shown, the pitch of the auger spiral ring formed by connecting a plurality of first spiral plates 210 increases from bottom to top.

[0032] Such a configuration enables the lower part of the first spiral plate 210 to more easily transport the soil upward after rotary excavation, and the pitch of the first spiral plate 210 increasing 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 of the inner spiral drill bit 200 during circumferential rotation.

[0033] In this embodiment, the outer diameter of the auger spiral ring formed by connecting a plurality of first spiral plates 210 decreases from bottom to top.

[0034] It can be understood that the lower part of the first spiral plate 210 is in direct contact with the soil and is responsible for the rotary excavation of the soil. Maximizing the lower diameter of the first spiral plate 210 is beneficial to improving the rotary excavation efficiency, while reducing the upper diameter 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 of the inner spiral drill bit 200 during rotation and preventing the inner spiral drill bit 200 from getting stuck during the rotary excavation operation.

[0035] In this embodiment, if Figure 3 and Figure 4 As shown, the pitch of the auger spiral ring formed by connecting multiple second spiral plates 310 decreases from bottom to top.

[0036] Such a configuration enables the upper area of ​​the second spiral plate 310 to store more soil, while reducing the contact area between the lower part of the second spiral plate 310 and the soil, thereby reducing the rotational resistance of the auger spiral ring formed by the second spiral plate 310.

[0037] It is understandable that the reason why more soil is stored in the area where the second spiral plate 310 is located is that after deceleration by the planetary gear 440, the rotational torque of the second spiral plate 310 is greater than the rotational torque of the first spiral plate 210, so the second spiral plate 310 can bear a larger load.

[0038] In this embodiment, if Figure 3 and Figure 4 As shown, the inner diameter of the auger spiral ring formed by connecting a plurality of second spiral plates 310 increases from bottom to top.

[0039] Such a configuration is beneficial for gradually compacting the soil in the area of ​​the second spiral plate 310 , so that more soil can be stored in the area where the second spiral plate 310 is located.

[0040] In this embodiment, if Figure 1 As shown, a plurality of drilling teeth 110 are provided at equal intervals in the circumferential direction on the lower end surface of the drill tube 100 .

[0041] Such a configuration is beneficial to reducing the resistance when the drill tube 100 drills into the soil.

[0042] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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, they should be considered to be within the scope of this specification.

[0043] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached 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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