A rotary drilling rig for pile foundation hole forming

Abstract

The present application relates to rotary drilling rig technical field, specifically to a kind of pile foundation hole-forming is prevented suction drill rotary drilling rig, including rotary drilling machine body, rotary drilling machine body is equipped with stop piece and rotary drill bit, the rotary drill bit includes drill cylinder, upper bottom plate and lower bottom plate, upper bottom plate is hingedly arranged at the bottom of drill cylinder, the lower bottom plate rotationally arranged at the bottom of upper bottom plate, the drill cylinder is equipped with lock catch mechanism, lock catch mechanism includes lock bar and locking piece, lock bar is arranged on the outer circumferential surface of drill cylinder, the lower end of lock bar is connected with lower bottom plate, the locking piece is slidably installed on drill cylinder, the upper end of lock bar and the lower end of locking piece are clamped together;When unloading, the rotary drill bit can be moved upwards, so that drill cylinder drives locking piece and lock bar to move upwards synchronously, when locking piece contacts with stop piece, locking piece moves downwards relative to lock bar, so that lock bar is separated from locking piece, and then soil in the interior of drill cylinder is automatically discharged, ensure feeding and unloading efficiency.

Description

Technical Field

[0001] This invention relates to the field of rotary drilling rig technology, and in particular to a rotary drilling rig for pile foundation drilling that prevents drill bit suction. Background Technology

[0002] A rotary drilling rig is a machine that uses a hydraulic system to power a telescopic drill rod and various types of rotary drill bits, along with a chassis traveling mechanism, to extract soil, break up soil, and form pile holes. To prevent the drill bit from being sucked in, vent holes are usually provided on the rotary drill bit, allowing air to enter the bottom of the drill bit, breaking the negative pressure and balancing the pressure.

[0003] For example, patent document CN113982490B discloses a rotary drilling bit and rotary drilling method suitable for mudstone strata, including a drill barrel, a locking mechanism, an upper base plate, and a lower base plate. The locking mechanism is located inside the drill barrel and is used to open the upper base plate to achieve material unloading. However, because the locking mechanism of this rotary drilling bit is located inside the drill barrel, the locking mechanism can easily block the entry and exit of soil, resulting in low feeding and discharging efficiency of the rotary drilling bit. Summary of the Invention

[0004] Therefore, it is necessary to provide a rotary drilling rig with anti-drill-sucking mechanism for pile foundation drilling, which addresses the technical problem that the locking mechanism inside the current rotary drilling bit affects the efficiency of feeding and discharging.

[0005] The above objectives are achieved through the following technical solutions:

[0006] A rotary drilling rig for pile foundation drilling with anti-drill-sucking capability includes a rotary drilling rig body, a stopper and a rotary drilling bit on the rotary drilling rig body, and a drill bit including a drill barrel, an upper base plate and a lower base plate. The axis of the drill barrel extends vertically, and the upper base plate is hinged to the bottom of the drill barrel. The upper base plate has an opening for soil to enter the interior of the drill barrel. The lower base plate is rotatably connected to the bottom of the upper base plate about the axis of the drill barrel. The rotation of the upper base plate relative to the lower base plate can open or close the opening. The bottom of the lower base plate has cutting teeth for drilling soil. The cutting teeth can cause the upper base plate to rotate relative to the lower base plate when inserted into the soil.

[0007] The drill barrel is equipped with a locking mechanism, which includes a locking rod and a locking element. The locking rod is disposed on the outer circumference of the drill barrel and extends in the vertical direction. The lower end of the locking rod is connected to the lower base plate. The locking element is slidably installed on the drill barrel in the vertical direction, and the lower end of the locking element extends into the inner top of the drill barrel. The upper end of the locking rod can extend into the inner top of the drill barrel and engage with the lower end of the locking element. During unloading, the rotary drill bit can move upward, thereby driving the locking element and the locking rod to move upward synchronously. When the locking element contacts the stop, the locking element moves downward relative to the locking rod, allowing the locking rod to disengage from the locking element. In turn, the locking rod drives the lower base plate and the upper base plate to rotate downward synchronously, so that the soil inside the drill barrel is automatically discharged.

[0008] Furthermore, the locking rod protrudes from the outer circumferential surface of the drill barrel. When the upper base plate rotates relative to the lower base plate, the locking rod can rotate synchronously around the outer circumferential surface of the drill barrel, thereby partially scraping away the soil on the outer circumferential surface of the drill barrel.

[0009] Furthermore, the outer circumferential surface of the drill barrel is provided with an L-shaped hole, and the upper end of the locking rod is provided with a snap-fit ​​connector extending radially along the drill barrel. The snap-fit ​​connector passes through the L-shaped hole and engages with the locking member. The L-shaped hole includes a first through hole extending in the horizontal direction and a second through hole extending in the vertical direction. One end of the first through hole communicates with the second through hole.

[0010] Furthermore, the stop is a stop plate, and the locking component includes a trigger rod and a locking ring. The drill barrel has a top plate, and the upper end of the trigger rod can pass through the top plate and contact the stop plate. The locking ring is located inside the drill barrel and connected to the lower end of the trigger rod. The locking ring includes an upper arc ring and a lower arc ring arranged correspondingly. Both the upper and lower arc rings are coaxially arranged with the drill barrel. The snap-fit ​​connector is provided with a snap-fit ​​groove. The snap-fit ​​connector can extend between the upper and lower arc rings and make the snap-fit ​​groove snap onto the lower arc ring, thereby realizing the snap-fit ​​between the snap-fit ​​connector and the locking ring.

[0011] Furthermore, a compression spring is sleeved on the trigger rod, and a retaining ring is provided on the trigger rod. The upper end of the compression spring is engaged with the retaining ring for a stop, and the lower end of the compression spring is engaged with the top plate for a stop. The compression spring has a tendency to cause the trigger rod to return to its original position upward.

[0012] Furthermore, the end of the snap-fit ​​connector is provided with a guide slope, which is inclined relative to the vertical direction. The guide slope can slide and engage with the lower arc ring, thereby guiding the snap-fit ​​slot to engage with the lower arc ring.

[0013] Furthermore, the drill barrel is also provided with a fixed bracket, the fixed bracket is provided with a guide hole, the axis of the guide hole extends in the vertical direction, and the trigger rod is slidably disposed in the guide hole.

[0014] Furthermore, the inner wall of the drill barrel is provided with a hinge shaft, which extends horizontally, and the upper base plate is provided with a hinge sleeve, which is rotatably mounted on the hinge shaft.

[0015] Furthermore, a sleeve is provided at the center of the upper base plate, and the sleeve is coaxially arranged with the drill barrel. A rotating shaft is provided at the center of the lower base plate, and the rotating shaft is rotatably engaged with the sleeve through a bearing.

[0016] Furthermore, the rotary drilling rig body is also equipped with a power system and a drill rod. The drill rod extends in the vertical direction, and the drill barrel is coaxially arranged at the bottom of the drill rod. The power system can drive the drill rod to move in the vertical direction or rotate around its own axis, thereby driving the drill barrel to move up and down synchronously or rotate around its own axis.

[0017] The beneficial effects of this invention are:

[0018] The rotary drilling rig for pile foundation drilling provided by the present invention has the following features: First, since the locking rod is located outside the drill barrel and the upper end of the locking rod extends into the inner top of the drill barrel and engages with the lower end of the locking member, the locking mechanism only occupies part of the space at the top of the drill barrel, and does not occupy all the space below the drill barrel, thus not hindering the entry or discharge of soil and ensuring the efficiency of feeding and unloading.

[0019] Secondly, after feeding is completed, the drill barrel is driven to rotate in the opposite direction, causing the upper bottom plate to rotate relative to the lower bottom plate and close the opening. Since the lower bottom plate is inserted into the soil through the cutting teeth, the lower bottom plate and the locking rod remain stationary. In this way, the drill barrel rotates relative to the locking rod, and the locking rod can partially scrape away the soil on the outer circumference of the drill barrel, so that an air passage can be formed between the drill barrel and the borehole wall, thereby avoiding the phenomenon of drill bit suction. There is no need to design additional air holes, simplifying the structure of the rotary drilling bit. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural schematic diagram of a rotary drilling rig for pile foundation drilling that is designed to prevent drill bit suction, according to an embodiment of the present invention.

[0021] Figure 2 This is a side view schematic diagram of a rotary drilling rig for pile foundation drilling with anti-drill-sucking capability provided in an embodiment of the present invention;

[0022] Figure 3 for Figure 2 Enlarged view of the structure at point A in the middle;

[0023] Figure 4 This is a schematic diagram of the rotary drilling bit and locking mechanism in a rotary drilling rig for pile foundation drilling that is designed to prevent drill bit suction, according to an embodiment of the present invention.

[0024] Figure 5 for Figure 4 Enlarged view of the structure at point B in the middle;

[0025] Figure 6 for Figure 4 Enlarged view of the structure at point C;

[0026] Figure 7 This is a schematic diagram of the assembly of the rotary drilling bit and locking mechanism in a rotary drilling rig for pile foundation drilling that is designed to prevent drill bit suction, according to an embodiment of the present invention.

[0027] Figure 8 for Figure 7 Sectional view of XX;

[0028] Figure 9 for Figure 8 Enlarged view of the structure at point D;

[0029] Figure 10 This is a schematic diagram of the first state of the upper and lower bottom plates in a rotary drilling rig for pile foundation drilling provided in an embodiment of the present invention;

[0030] Figure 11 This is a schematic diagram of the second state of the upper and lower bottom plates in a rotary drilling rig for pile foundation drilling provided in an embodiment of the present invention;

[0031] Figure 12 This is a partial cross-sectional schematic diagram of a rotary drilling rig for pile foundation drilling with anti-drill-sucking capability, provided in an embodiment of the present invention.

[0032] in:

[0033] 110. Rotary drilling rig body; 111. Power system; 112. Drill rod; 113. Stop plate; 120. Drill barrel; 121. Top plate; 122. Fixed bracket; 123. First through hole; 124. Second through hole; 125. Hinge hole; 130. Trigger rod; 131. Retaining ring; 132. Compression spring; 133. Upper arc ring; 134. Lower arc ring; 140. Lower base plate; 141. Snap connector; 142. Cutting teeth; 143. Bearing; 144. Locking rod; 145. Snap groove; 146. Guide slope; 150. Upper base plate; 151. Opening; 152. Hinge shaft; 153. Sleeve; 154. Push bar. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be 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 merely illustrative of the invention and are not intended to limit the invention.

[0035] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] like Figures 1 to 12 As shown in the figure, an embodiment of the present invention provides a rotary drilling rig for pile foundation drilling with anti-drill-sucking capability, including a rotary drilling rig body 110. The rotary drilling rig body 110 is provided with a stop and a rotary drilling bit. The rotary drilling bit includes a drill cylinder 120, an upper base plate 150 and a lower base plate 140. The axis of the drill cylinder 120 extends in the vertical direction. The upper base plate 150 is hinged to the bottom of the drill cylinder 120. The upper base plate 150 is provided with an opening 151 for... Soil enters the interior of the drill barrel 120; the lower base plate 140 is rotatably connected to the bottom of the upper base plate 150 around the axis of the drill barrel 120. The rotation of the lower base plate 140 relative to the upper base plate 150 can open or close the opening 151. The bottom of the lower base plate 140 is provided with cutting teeth 142, which are used to drill soil. When the cutting teeth 142 are inserted into the soil, the rotation of the drill barrel 120 can drive the upper base plate 150 to rotate relative to the lower base plate 140.

[0038] Both the upper base plate 150 and the lower base plate 140 are composed of two sector-shaped plates, and the bottom of the upper base plate 150 is provided with two push bars 154. The upper base plate 150 and the lower base plate 140 have a first state and a second state. The first state is as follows: Figure 10As shown, the upper base plate 150 and the lower base plate 140 overlap, and the side of the lower base plate 140 engages with the push bar 154 of the upper base plate 150 to stop it. At this time, the opening 151 on the upper base plate 150 is fully open. The second state is as follows. Figure 11 As shown, the overlap between the lower base plate 140 and the upper base plate 150 is reduced, so the opening 151 on the upper base plate 150 is not completely closed.

[0039] The drill barrel 120 is equipped with a locking mechanism, which includes a locking rod 144 and a locking member. The locking rod 144 is disposed on the outer circumferential surface of the drill barrel 120 and extends in the vertical direction. The lower end of the locking rod 144 is connected to the lower base plate 140. The locking member is slidably mounted on the drill barrel 120 in the vertical direction, and the lower end of the locking member extends into the inner top of the drill barrel 120. The upper end of the locking rod 144 can extend into the inner top of the drill barrel 120 and engage with the lower end of the locking member. During unloading, the rotary drill bit can move upward, thereby causing the drill barrel 120 to move upward synchronously with the locking member and the locking rod 144. When the locking member contacts the stop, the locking member moves downward relative to the locking rod 144, thereby causing the locking rod 144 to disengage from the locking member. Then, the locking rod 144 drives the lower base plate 140 and the upper base plate 150 to rotate downward synchronously, so that the soil inside the drill barrel 120 is automatically discharged.

[0040] Specifically, the lower end of the locking rod 144 is fixedly connected to the lower base plate 140.

[0041] Since the locking rod 144 is located outside the drill barrel 120, and the upper end of the locking rod 144 extends into the inner top of the drill barrel 120 and engages with the lower end of the locking member, the locking mechanism only occupies part of the space at the inner top of the drill barrel 120, and does not occupy all the space below the drill barrel 120, thus not hindering the entry or discharge of soil and ensuring the efficiency of feeding and unloading.

[0042] Furthermore, the locking rod 144 protrudes from the outer peripheral surface of the drill barrel 120. When the upper base plate 150 rotates relative to the lower base plate 140, the locking rod 144 can rotate synchronously around the outer peripheral surface of the drill barrel 120, thereby partially scraping away the soil on the outer peripheral surface of the drill barrel 120.

[0043] After feeding is completed, the drill barrel 120 is driven to rotate in the opposite direction, causing the upper bottom plate 150 to rotate relative to the lower bottom plate 140 and partially close the opening 151. Since the lower bottom plate 140 is inserted into the soil layer through the cutting teeth 142, the lower bottom plate 140 and the locking rod 144 remain stationary. In this way, the drill barrel 120 rotates relative to the locking rod 144, and the locking rod 144 can partially scrape away the soil on the outer circumference of the drill barrel 120, so that a ventilation channel can be formed between the drill barrel 120 and the borehole wall, thereby avoiding the phenomenon of drill bit suction. There is no need to design additional ventilation holes, simplifying the structure of the rotary drilling bit.

[0044] In other embodiments, a vent hole can be provided on the drill barrel 120, and a recessed sliding area can be provided on the outer peripheral surface of the drill barrel 120, so that the locking rod 144 can slide in the sliding area, thus the locking rod 144 does not need to protrude from the outer peripheral surface of the drill barrel 120.

[0045] Furthermore, the outer circumferential surface of the drill barrel 120 is provided with an L-shaped hole, and the upper end of the locking rod 144 is provided with a snap-fit ​​connector 141 extending radially along the drill barrel 120. The snap-fit ​​connector 141 passes through the L-shaped hole and engages with the locking member. The L-shaped hole includes a first through hole 123 extending in the horizontal direction and a second through hole 124 extending in the vertical direction. One end of the first through hole 123 communicates with the second through hole 124.

[0046] After feeding is completed, the drive cylinder 120 rotates in the opposite direction, causing the upper base plate 150 to be in the opposite direction to the lower base plate 140 (i.e., Figure 11 Rotating the upper base plate 150 clockwise (as seen from the paper) partially closes the opening 151, allowing the snap-fit ​​connector 141 to slide along the first through hole 123 and enter the second through hole 124. As the drill barrel 120 moves upward, when the locking member contacts the stop member, and the locking rod 144 disengages from the locking member, the snap-fit ​​connector 141 can slide along the second through hole 124, thereby enabling the upper base plate 150 to rotate downward.

[0047] Furthermore, the stop is a stop plate 113, and the locking component includes a trigger rod 130 and a locking ring. The drill barrel 120 has a top plate 121. The upper end of the trigger rod 130 can pass through the top plate 121 and contact the stop plate 113. The locking ring is located inside the drill barrel 120 and connected to the lower end of the trigger rod 130. The locking ring includes an upper arc-shaped ring 133 and a lower arc-shaped ring 134 arranged correspondingly. Both the upper arc-shaped ring 133 and the lower arc-shaped ring 134 are coaxially arranged with the drill barrel 120. The snap-fit ​​connector 141 is provided with a snap-fit ​​groove 145. The snap-fit ​​connector 141 can extend between the upper arc-shaped ring 133 and the lower arc-shaped ring 134, and the snap-fit ​​groove 145 is engaged with the lower arc-shaped ring 134, thereby realizing the snap-fit ​​between the snap-fit ​​connector 141 and the locking ring. This locking component has a simple structure and is easy to manufacture.

[0048] Specifically, both ends of the upper arc ring 133 and the lower arc ring 134 are connected by vertical rods.

[0049] Furthermore, a compression spring 132 is sleeved on the trigger rod 130, and a retaining ring 131 is provided on the trigger rod 130. The upper end of the compression spring 132 is in a stop-fitting cooperation with the retaining ring 131, and the lower end of the compression spring 132 is in a stop-fitting cooperation with the top plate 121. The compression spring 132 has a tendency to cause the trigger rod 130 to return to its original position upward.

[0050] Furthermore, the end of the snap-fit ​​connector 141 is provided with a guide slope 146, which is inclined relative to the vertical direction. The guide slope 146 can slide and engage with the lower arc ring 134, thereby guiding the snap-fit ​​groove 145 to snap onto the lower arc ring 134.

[0051] By setting the guide slope 146, the snap-fit ​​connector 141 can more easily enter between the upper arc ring 133 and the lower arc ring 134, thus facilitating snap-fit.

[0052] Furthermore, the drill barrel 120 is also provided with a fixed bracket 122, the fixed bracket 122 is provided with a guide hole, the axis of the guide hole extends in the vertical direction, and the trigger rod 130 is slidably disposed in the guide hole.

[0053] By setting the fixed bracket 122, the trigger rod 130 is straightened, preventing the trigger rod 130 from tilting.

[0054] Furthermore, the inner wall of the drill barrel 120 is provided with a hinge shaft 152, which extends in the horizontal direction, and the upper base plate 150 is provided with a hinge sleeve, which is rotatably mounted on the hinge shaft 152.

[0055] Specifically, the inner wall of the drill barrel 120 is provided with a hinge hole 125, and the hinge shaft 152 is fixedly installed in the hinge hole 125. The hinge shaft 152 and the locking rod 144 are arranged opposite to each other in the circumferential direction of the drill barrel 120.

[0056] Furthermore, the upper base plate 150 is provided with a sleeve 153 at its center, the sleeve 153 is coaxially arranged with the drill barrel 120, and the lower base plate 140 is provided with a rotating shaft at its center, the rotating shaft being rotatably engaged with the sleeve 153 through a bearing 143.

[0057] Furthermore, the rotary drilling rig body 110 is also equipped with a power system 111 and a drill rod 112. The drill rod 112 extends in the vertical direction, and the drill barrel 120 is coaxially arranged at the bottom of the drill rod 112. The power system 111 can drive the drill rod 112 to move in the vertical direction or rotate around its own axis, thereby driving the drill barrel 120 to move up and down synchronously or rotate around its own axis.

[0058] The power system 111 can adopt the existing power head assembly and hydraulic telescopic cylinder. The power head assembly consists of a hydraulic motor and a reducer, which can drive the drill rod 112 to rotate around its own axis; the hydraulic telescopic cylinder can drive the drill rod 112 to move in the vertical direction. The rotary drilling rig body 110 is also equipped with tracks, which can move on the ground, thereby adapting to various complex terrains.

[0059] Based on the above embodiments, the usage principle and working process of the embodiments of the present invention are as follows:

[0060] In the initial state, the snap-fit ​​groove 145 of the snap-fit ​​connector 141 engages with the lower arc-shaped ring 134, the snap-fit ​​connector 141 is located in the first through hole 123 and close to the second through hole 124, and the lower base plate 140 and the upper base plate 150 are perpendicular. Figure 11 The second state in.

[0061] Feeding process: Start the power system 111, which drives the drill rod 112 to move downward, thereby driving the rotary drill bit to move downward synchronously and forward (i.e., Figure 11 The rotary drilling bit rotates counterclockwise (as seen from the paper), causing it to gradually move downwards and contact the soil layer. Once the cutting teeth 142 on the lower base plate 140 are inserted into the soil, the resistance of the soil prevents the lower base plate 140 from rotating in the forward direction (i.e., the lower base plate 140 remains essentially stationary). This causes the upper base plate 150 to rotate relative to the lower base plate 140, resulting in an angle between the lower base plate 140 and the upper base plate 150. Figure 10 In the first state shown, the lower base plate 140 fully opens the opening 151 on the upper base plate 150, allowing soil to enter the drill barrel 120 through the opening 151, thus achieving feeding. After the drill barrel 120 is filled with soil, the power system 111 stops the rotary drill bit from moving downwards and causes the rotary drill bit to rotate in the opposite direction (i.e., ...). Figure 10 (Looking at the paper from a clockwise direction), at this time, the cutting teeth 142 on the lower base plate 140 are inserted into the soil layer, so the lower base plate 140 and the locking rod 144 remain stationary. This causes the drill barrel 120 to rotate in the opposite direction relative to the locking rod 144. The locking rod 144 can partially scrape away the soil on the outer circumference of the drill barrel 120, creating an air passage between the drill barrel 120 and the borehole wall, thus preventing drill bit suction. Simultaneously, the clamping connector 141 enters the second through hole 124 through the first through hole 123, such as... Figure 11 As shown, the overlap between the upper base plate 150 and the lower base plate 140 is reduced, and the lower base plate 140 does not completely seal the opening 151 on the upper base plate 150 to prevent soil leakage.

[0062] Unloading process: The power system 111 drives the rotary drill bit to rise. When the trigger rod 130 on the drill barrel 120 contacts the stop plate 113, the trigger rod 130 moves downward, causing the locking ring to move downward synchronously. This allows the locking joint 141 of the locking rod 144 to disengage from the lower arc ring 134, thus unlocking the locking rod 144. At this time, under the action of gravity, the locking rod 144, the lower base plate 140, and the upper base plate 150 can rotate around the hinge shaft 152, thereby opening the bottom of the drill barrel 120 and realizing automatic unloading.

[0063] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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.

[0064] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A rotary drilling rig for pile foundation drilling with anti-drill-sucking capability, characterized in that, include: The rotary drilling rig body is equipped with a stop and a rotary drilling bit. The rotary drilling bit includes a drill barrel, an upper base plate, and a lower base plate. The axis of the drill barrel extends vertically. The upper base plate is hinged to the bottom of the drill barrel and has an opening for soil to enter the interior of the drill barrel. The lower base plate is rotatably connected to the bottom of the upper base plate about the axis of the drill barrel. The rotation of the upper base plate relative to the lower base plate can open or close the opening. The bottom of the lower base plate has cutting teeth for drilling soil. When the cutting teeth are inserted into the soil, the rotation of the drill barrel can drive the upper base plate to rotate relative to the lower base plate. A locking mechanism is provided on the rotary drilling bit. The locking mechanism includes a locking rod and a locking member. The locking rod is provided on the outer circumferential surface of the drill barrel and extends in the vertical direction. The lower end of the locking rod is connected to the lower bottom plate. The locking member is slidably installed on the drill barrel in the vertical direction, and the lower end of the locking member extends into the inner top of the drill barrel. The upper end of the locking rod can extend into the inner top of the drill barrel and engage with the lower end of the locking member. During unloading, the rotary drill bit can move upward, thereby driving the locking member and locking rod to move upward synchronously. When the locking member contacts the stop member, the locking member moves downward relative to the locking rod, allowing the locking rod to disengage from the locking member. The locking rod then drives the lower and upper base plates to rotate downward synchronously, automatically discharging the soil inside the drill barrel. The outer circumference of the drill barrel is provided with an L-shaped hole. The upper end of the locking rod is provided with a snap-fit ​​connector extending radially along the drill barrel. The snap-fit ​​connector passes through the L-shaped hole and engages with the locking member. The L-shaped hole includes a first through hole extending horizontally and a second through hole extending vertically. One end of the perforation is connected to the second perforation. The stop is a stop plate. The locking element includes a trigger rod and a locking ring. The drill barrel has a top plate. The upper end of the trigger rod can pass through the top plate and contact the stop plate. The locking ring is located inside the drill barrel and is connected to the lower end of the trigger rod. The locking ring includes an upper arc ring and a lower arc ring arranged correspondingly. The upper arc ring and the lower arc ring are both coaxially arranged with the drill barrel. The snap-fit ​​connector is provided with a snap-fit ​​groove. The snap-fit ​​connector can extend between the upper arc ring and the lower arc ring and make the snap-fit ​​groove snap onto the lower arc ring, thereby realizing the snap-fit ​​between the snap-fit ​​connector and the locking ring.

2. The rotary drilling rig for pile foundation drilling with anti-drill-sucking capability according to claim 1, characterized in that, The locking rod protrudes from the outer circumference of the drill barrel. When the upper base plate rotates relative to the lower base plate, the locking rod can rotate synchronously around the outer circumference of the drill barrel, thereby partially scraping away the soil on the outer circumference of the drill barrel.

3. The rotary drilling rig for pile foundation drilling with anti-drill-sucking capability according to claim 1, characterized in that, A compression spring is fitted on the trigger rod, and a retaining ring is provided on the trigger rod. The upper end of the compression spring is engaged with the retaining ring, and the lower end of the compression spring is engaged with the top plate. The compression spring has a tendency to cause the trigger rod to return to its original position.

4. The rotary drilling rig for pile foundation drilling with anti-drill-sucking capability according to claim 3, characterized in that, The end of the snap-fit ​​connector is provided with a guide slope, which is inclined relative to the vertical direction. The guide slope can slide and engage with the lower arc ring, thereby guiding the snap-fit ​​slot to engage with the lower arc ring.

5. The rotary drilling rig for pile foundation drilling with anti-drill-sucking capability according to claim 1, characterized in that, The drill barrel is also provided with a fixed bracket, and the fixed bracket is provided with a guide hole. The axis of the guide hole extends in the vertical direction, and the trigger rod is slidably disposed in the guide hole.

6. The rotary drilling rig for pile foundation drilling with anti-drill-sucking capability according to claim 1, characterized in that, The inner wall of the drill barrel is provided with a hinge shaft, which extends horizontally, and the upper base plate is provided with a hinge sleeve, which is rotatably mounted on the hinge shaft.

7. The rotary drilling rig for pile foundation drilling with anti-drill-sucking capability according to claim 1, characterized in that, The upper base plate has a sleeve at its center, which is coaxial with the drill barrel. The lower base plate has a rotating shaft at its center, which is rotatably engaged with the sleeve through a bearing.

8. The rotary drilling rig for pile foundation drilling with anti-drill-sucking capability according to claim 1, characterized in that, The rotary drilling rig body is also equipped with a power system and a drill rod. The drill rod extends in the vertical direction, and the drill barrel is coaxially arranged at the bottom of the drill rod. The power system can drive the drill rod to move in the vertical direction or rotate around its own axis, thereby driving the drill barrel to move up and down synchronously or rotate around its own axis.

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