A deep hole rotary drilling rig for pile foundation construction

Abstract

The present application relates to rotary digging device technical field, specifically to a kind of pile construction's deep hole rotary drilling rig, including machine body and sand bucket.Lifting sand bucket includes barrel, rotary digging plate and unlocking lever.Barrel is vertically arranged on machine body.Rotary digging plate is rotatably installed in the lower end of barrel, and unlocking lever is rotatably installed in barrel, the lower end of unlocking lever is rotatably connected with hook, and the circumferential wall surface of barrel is provided with through opening.Rotary digging plate is provided with hanging rod, and hook is engaged with hanging rod in initial state.A kind of pile construction's deep hole rotary drilling rig of the present application is by the work of lifting sand bucket is divided into first state and second state, in first state, make hook extend through opening and agitate soil, break the close fit between soil and barrel, reduce the resistance when subsequent lifting barrel.In second state, through unlocking lever control rotary digging plate open to realize soil removal, two states orderly link, guarantee the normal progress of rotary digging.

Description

Technical Field

[0001] This invention relates to the field of rotary drilling rig technology, and more specifically to a deep-hole rotary drilling rig for pile foundation construction. Background Technology

[0002] In pile foundation construction, rotary drilling rigs, as highly efficient hole-forming equipment, are widely used in deep hole drilling operations for building foundations, bridge foundations, and other projects. One of its core drilling tools is the sand scoop bucket. The sand scoop bucket is connected to the drill rig's power head via a square head. It uses the rotation of the cylinder to cut into the strata, and then uses a movable bottom gate to grab and unload loose strata materials such as sand and pebbles. It is a key component to ensure the efficiency of pile foundation hole formation.

[0003] Sand dredging buckets can be classified into two types according to their cylindrical structure: straight cylindrical and conical cylindrical. Among them, the conical cylindrical sand dredging bucket, due to its conical shape, can generate centripetal extrusion force during drilling, reducing the frictional resistance of the strata on the cylinder and significantly improving the drilling speed. Therefore, it is widely used in rotary drilling of pile foundations.

[0004] However, during construction in clay layers, due to the high viscosity and low permeability of the clay soil, when the conical sand-scooping bucket rotates and cuts into the clay layer, the soil tends to adhere tightly to the inner wall of the bucket. Furthermore, due to the conical structure's closing characteristics, the soil and the bucket easily form a near-sealed fit, significantly increasing the resistance when lifting the bucket. This not only reduces construction efficiency but may also cause the bucket to deform due to forced lifting, or even lead to drill bit breakage, which is detrimental to normal construction. Summary of the Invention

[0005] This invention provides a deep-hole rotary drilling rig for pile foundation construction, which solves the problem that when the existing cone-type sand scoop is used in clay layer construction, the soil and the scoop body easily form a near-sealed fit, which greatly increases the resistance when lifting the scoop body and affects the normal progress of construction.

[0006] The present invention provides a deep-hole rotary drilling rig for pile foundation construction, comprising a machine body and a sand-collecting bucket; the sand-collecting bucket includes a cylinder, a rotary drilling plate, and an unlocking rod; the cylinder is a tapered cylinder vertically arranged on the machine body and is wider at the bottom than at the top, and the cylinder can move up and down relative to the machine body and rotate around its own axis relative to the machine body; the rotary drilling plate is rotatably mounted on the lower end of the cylinder around a first reference axis direction, the first reference axis direction being perpendicular to the axis direction of the cylinder, and an inlet is provided on the rotary drilling plate; the unlocking rod is inclined relative to the vertical direction and rotatably mounted in the cylinder around a second reference axis direction, the second reference axis direction being perpendicular to the axis direction of the unlocking rod; the lower end of the unlocking rod is rotatably connected by a first elastic element. The device is equipped with a hook that can rotate relative to the unlocking rod around a second reference axis. An opening is provided on the peripheral wall of the cylinder, allowing the hook to extend out of the opening. A hanging rod is provided on the upper surface of the rotary drilling plate, initially engaging the hook with the hanging rod. The sand-collecting bucket has a first state and a second state. In the first state, the rotary drilling plate rotates upward relative to the cylinder around the first reference axis, causing the hook to rotate relative to the unlocking rod around the second reference axis and disengage from the hanging rod, thus extending the hook out of the opening. In the second state, the unlocking rod rotates relative to the cylinder around the second reference axis, causing the hook to rotate around the second reference axis and disengage from the hanging rod, while the rotary drilling plate rotates downward relative to the cylinder around the first reference axis.

[0007] Furthermore, in the initial state, there is a gap between the side of the rotary drilling plate where the hook and the hanging rod are engaged and the cylinder.

[0008] Furthermore, a trigger rod is provided on the upper end face of the rotary drilling plate. The rotary drilling plate rotates upward relative to the cylinder in the direction of the first reference axis so that the upper end face of the trigger rod abuts against the lower end face of the hook, and the lower end face of the hook is an inclined surface.

[0009] Furthermore, it also includes a pressure plate, which is mounted on the machine body and located directly above the cylinder. The cylinder is movable up and down relative to the pressure plate, and when the cylinder moves up relative to the pressure plate, it can abut against the pressure plate and cause the unlocking rod to rotate relative to the cylinder about the second reference axis.

[0010] Furthermore, the pressure plate has an edge in the circumferential direction, and the edge is set in the vertical direction; the upper end of the unlocking rod extends out of the cylinder and is rotatably connected to the rotating rod through the second elastic element; both the unlocking rod and the rotating rod can be slidably set on the cylinder in the radial direction of the cylinder, and the rotating rod is inclined relative to the unlocking rod. One end of the unlocking rod extending out of the cylinder can abut against the edge, and the edge causes the unlocking rod to rotate around the second reference axis.

[0011] Furthermore, the rotating rod is rotatably connected to the unlocking rod via the second rotating shaft. An anti-rotation rod is provided on the rotating rod. The axial direction of the anti-rotation rod and the axial direction of the second rotating shaft are both parallel to the direction of the second reference axis, and the anti-rotation rod is located on the side of the second rotating shaft in the radial direction of the cylinder that is close to the central axis of the cylinder.

[0012] Furthermore, the section of the unlocking lever extending out of the cylinder is connected to the cylinder via a third elastic element.

[0013] Furthermore, a groove is provided on the cylinder body, the groove is arranged in the radial direction of the cylinder body, and the upper end of the unlocking rod passes through the groove and extends out of the cylinder body.

[0014] Furthermore, both ends of the rotating rod along the second reference axis are provided with locking pins, and the cylinder is provided with a limiting rod. In the initial state, there is a gap between the locking pins and the limiting rod in the radial direction of the cylinder, and the rotating rod can slide along the radial direction of the cylinder towards the side closer to the central axis of the cylinder so that the limiting rod abuts against the locking pins.

[0015] Furthermore, the unlocking rod is hinged to the cylinder body via a third pivot, and the unlocking rod is positioned close to the inner circumferential wall of the cylinder body. The axial direction of the third pivot is the direction of the second reference axis.

[0016] The beneficial effects of this invention are as follows: The deep-hole rotary drilling rig for pile foundation construction divides the operation of the sand-collecting bucket into a first state and a second state. In the first state, the hook extends from the opening to agitate the soil, breaking the tight seal between the soil and the cylinder, preventing excessive sealing, reducing resistance during subsequent cylinder lifting, and making the cylinder easier to pull out, ensuring the normal operation of the rotary drilling rig. Furthermore, the rotary drilling plate automatically triggers the hook extension based on soil pressure, requiring no additional power control. In the second state, the rotary drilling plate opens via an unlocking rod to discharge soil, and the hook's pre-reset prevents soil leakage during cylinder lifting. The two states are seamlessly connected, ensuring the normal operation of the rotary drilling. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of a deep-hole rotary drilling rig for pile foundation construction according to the present invention;

[0019] Figure 2This is a schematic diagram of the sand-collecting bucket and pressure plate in the initial state of an embodiment of a deep-hole rotary drilling rig for pile foundation construction according to the present invention;

[0020] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0021] Figure 4 A cross-sectional view of the sand-collecting bucket and pressure plate in the initial state of an embodiment of a deep-hole rotary drilling rig for pile foundation construction according to the present invention;

[0022] Figure 5 for Figure 4 Enlarged view of point B in the middle;

[0023] Figure 6 This is a diagram showing the sand scoop in a first state and the hook extending out of the opening, according to an embodiment of a deep-hole rotary drilling rig for pile foundation construction of the present invention.

[0024] Figure 7 This is a diagram showing the sand-collecting bucket in a second state and the cylinder moving upwards to the point where the rotating rod abuts against the pressure plate, according to an embodiment of the deep-hole rotary drilling rig for pile foundation construction of the present invention.

[0025] Figure 8 for Figure 7 Enlarged view of point C in the middle;

[0026] Figure 9 This is a diagram showing the sand-collecting bucket in a second state and the cylinder moving upwards to the point where the rotating rod abuts against the edge, according to an embodiment of the deep-hole rotary drilling rig for pile foundation construction of the present invention.

[0027] Figure 10 for Figure 9 Enlarged view of point D in the middle;

[0028] Figure 11 This is a diagram showing the sand-collecting bucket in a second state and the cylinder moving upwards to a state where the rotating rod and the pressure plate are in contact, according to an embodiment of the deep-hole rotary drilling rig for pile foundation construction of the present invention.

[0029] Figure 12 for Figure 11 Enlarged view at point E in the middle;

[0030] Figure 13 for Figure 11 Enlarged view at point F;

[0031] Figure 14 This is a diagram showing the state of the limiting rod and the locking column when they are in contact, according to an embodiment of a deep-hole rotary drilling rig for pile foundation construction of the present invention.

[0032] Figure 15 for Figure 14 A magnified view of point G in the middle.

[0033] In the diagram: 100, machine body; 110, drive component; 200, sand scoop; 210, cylinder; 211, through-hole; 212, chute; 213, limit rod; 220, rotary drilling plate; 221, hanging rod; 222, trigger rod; 223, first rotating shaft; 230, unlocking rod; 240, first elastic element; 250, hook; 260, second elastic element; 270, rotating rod; 271, anti-rotation rod; 272, locking post; 280, third elastic element; 300, pressure plate; 310, edge. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] An embodiment of the deep-hole rotary drilling rig for pile foundation construction according to the present invention is as follows: Figures 1 to 15 As shown.

[0036] A deep-hole rotary drilling rig for pile foundation construction includes a body 100 and a sand-collecting bucket 200. The sand-collecting bucket 200 includes a cylinder 210, a rotary drilling plate 220, and an unlocking rod 230. The cylinder 210 is a tapered cylinder, wider at the bottom and narrower at the top, mounted vertically on the body 100. The cylinder 210 can move up and down relative to the body 100 and can rotate about its own axis relative to the body 100. The rotary drilling plate 220 is coaxial with the cylinder 210 and rotatably mounted on the lower end of the cylinder 210 about a first reference axis perpendicular to the axis of the cylinder 210. An inlet is provided on the rotary drilling plate 220.

[0037] The unlocking rod 230 is installed inside the cylinder 210 at an angle relative to the vertical direction and is rotatable about a second reference axis, which is perpendicular to the axis of the unlocking rod 230. A hook 250 is rotatably connected to the lower end of the unlocking rod 230 via a first elastic element 240, and the hook 250 is rotatable about the second reference axis relative to the unlocking rod 230. The first elastic element 240 is a torsion spring. An opening 211 is provided on the peripheral wall of the cylinder 210, and the hook 250 can extend out of the opening 211 by rotating about the second reference axis relative to the unlocking rod 230. A hanging rod 221 is provided on the upper surface of the rotary drilling plate 220, and initially the hook 250 is engaged with the hanging rod 221. The first elastic element 240 always has a tendency to cause the hook 250 to rotate about the second reference axis relative to the unlocking rod 230 towards the hanging rod 221 and engage with it.

[0038] The sand dredging bucket 200 has a first state and a second state. In the first state, the rotary drilling plate 220 rotates upward relative to the cylinder 210 about the first reference axis, and the hook 250 rotates relative to the unlocking rod 230 about the second reference axis to disengage from the hanging rod 221, so that the hook 250 extends out of the opening 211. In the second state, the unlocking rod 230 rotates relative to the cylinder 210 about the second reference axis, and drives the hook 250 to rotate about the second reference axis to disengage from the hanging rod 221, and the rotary drilling plate 220 rotates downward relative to the cylinder 210 about the first reference axis.

[0039] Specifically, the cylinder 210 is mounted on the body 100 via a drive member 110. The drive member 110 can move up and down relative to the body 100 and can rotate around its own axis relative to the body 100. The cylinder 210 can move synchronously with the drive member 110. The drive member 110 is prior art and will not be described in detail here.

[0040] The rotary drilling plate 220 is hinged to the lower end of the cylinder 210 via a first rotating shaft 223. The first rotating shaft 223 is located at one end of the rotary drilling plate 220, and the direction of the first reference axis is the axial direction of the first rotating shaft 223.

[0041] In this embodiment, a sand-collecting bucket 200 is installed on the machine body 100. During construction, the cylinder 210 moves downward while rotating around its own axis. At this time, the rotary drilling plate 220 installed at the lower end of the cylinder 210 will move synchronously with the cylinder 210 to perform rotary drilling on the soil, allowing the soil to enter the interior of the cylinder 210 from the inlet. At this time, the sand-collecting bucket 200 is in the first state. During the downward rotary drilling process of the sand-collecting bucket 200, the rotary drilling plate 220 will rotate upward relative to the cylinder 210 around the first reference axis under the action of soil pressure, and cause the hook 250 to rotate relative to the unlocking rod 230 around the second reference axis, so that the hook 250 disengages from the hanging rod 221 and extends out of the opening 211.

[0042] As the cylinder 210 continues to rotate and descend, the hook 250 extending from the cylinder 210 will agitate the surrounding soil, breaking the tight seal between the soil and the cylinder 210. This prevents the seal from becoming too tight, reducing resistance during subsequent lifting of the cylinder 210 and making it easier to pull out, ensuring the normal operation of the rotary drilling rig. After downward rotary drilling is completed, the cylinder 210 moves upward relative to the machine body 100. Once the soil pressure is removed, the hook 250 will reset under the action of the first elastic element 240, allowing it to re-engage with the hook rod 221. This prevents the rotary drilling plate 220 from opening prematurely, causing soil leakage and ensuring soil retention inside the cylinder 210.

[0043] During the upward movement of the cylinder 210 relative to the machine body 100, the sand-collecting hopper 200 is in the second state, see [reference]. Figures 7 to 13 As shown, the unlocking rod 230 will rotate relative to the cylinder 210 around the second reference axis, causing the hook 250 to rotate around the second reference axis again, disengaging the hook 250 from the hanging rod 221. This allows the rotary drilling plate 220 to rotate downwards around the first reference axis under its own weight and soil pressure, bringing the cylinder 210 to the ground level for easy removal of soil. It should be noted that although the inlet on the rotary drilling plate 220 remains open during the upward movement of the cylinder 210, the soil inside the cylinder 210 is already compacted and will not leak out.

[0044] In a further embodiment, in the initial state, there is a gap between the side of the rotary drilling plate 220 where the hook 250 and the hanging rod 221 are engaged and the cylinder 210, so that when the sand hopper 200 is digging downwards, the rotary drilling plate 220 can rotate upwards relative to the cylinder 210 around the first reference axis under the action of soil pressure.

[0045] Furthermore, a trigger rod 222 is provided on the upper end face of the rotary drilling plate 220. The rotary drilling plate 220 can rotate upward relative to the cylinder 210 around the first reference axis so that the upper end face of the trigger rod 222 abuts against the lower end face of the hook 250. The lower end face of the hook 250 is inclined, so that when the upper end face of the trigger rod 222 abuts against the lower end face of the hook 250, the hook 250 can rotate relative to the unlocking rod 230 around the second reference axis, so that the hook 250 disengages from the hanging rod 221 and extends out of the opening 211.

[0046] See Figures 4 to 6 As shown, during the downward rotary excavation process of the sand hopper 200, the rotary excavator plate 220 can rotate upward relative to the cylinder 210 around the first reference axis under the action of soil pressure. After the upper end face of the trigger rod 222 abuts against the lower end face of the hook 250, if the rotary excavator plate 220 continues to move upward, the trigger rod 222 will cause the hook 250 to rotate relative to the unlocking rod 230 around the second reference axis to the side away from the central axis of the cylinder 210, so that the hook 250 extends out of the opening 211.

[0047] In a further embodiment, a deep-hole rotary drilling rig for pile foundation construction also includes a pressure plate 300, which is installed on the machine body 100 and located directly above the cylinder 210. The cylinder 210 is configured to move up and down relative to the pressure plate 300 and to rotate relative to the pressure plate 300 about its own axis. The upward movement of the cylinder 210 relative to the pressure plate 300 can abut against the pressure plate 300 and cause the unlocking rod 230 to rotate relative to the cylinder 210 about a second reference axis.

[0048] The pressure plate 300 has a circumferential edge 310, which is vertically oriented. The upper end of the unlocking rod 230 extends out of the cylinder 210 and is rotatably connected to a rotating rod 270 via a second elastic element 260. The second elastic element 260, being a torsion spring, always tends to cause the rotating rod 270 to rotate upwards relative to the unlocking rod 230 around a second reference axis. Both the unlocking rod 230 and the rotating rod 270 are slidably mounted on the cylinder 210 along its radial direction. The rotating rod 270 is inclined relative to the unlocking rod 230. One end of the unlocking rod 230 extending out of the cylinder 210 abuts against the edge 310, causing the unlocking rod 230 to rotate around the second reference axis via the edge 310.

[0049] Furthermore, the rotating rod 270 is rotatably connected to the unlocking rod 230 via a second rotating shaft. An anti-rotation rod 271 is provided on the rotating rod 270. The axial direction of the anti-rotation rod 271 and the axial direction of the second rotating shaft are both parallel to the direction of the second reference axis, and the anti-rotation rod 271 is located on the side of the second rotating shaft in the radial direction of the cylinder 210, closer to the central axis of the cylinder 210. By providing the anti-rotation rod 271, the maximum included angle between the rotating rod 270 and the unlocking rod 230 is limited.

[0050] When the downward rotary drilling ends and the cylinder 210 moves upward relative to the pressure plate 300, see [reference needed]. Figures 7 to 13 As shown, the rotating rod 270 will first contact the pressure plate 300. After the rotating rod 270 contacts the pressure plate 300, as the cylinder 210 continues to move upward, the pressure plate 300 will apply pressure to the rotating rod 270, causing the rotating rod 270 to rotate relative to the unlocking rod 230 and gradually abut against the edge 310 of the pressure plate 300. When the rotating rod 270 abuts against the edge 310 of the pressure plate 300, as the cylinder 210 continues to move upward, the rotating rod 270 will be subjected to downward pressure from the pressure plate 300 and lateral pressure from the edge 310. This will cause the rotating rod 270 and the unlocking rod 230 to be subjected to a downward force. The rotating rod 270 will drive the unlocking rod 230 to rotate, causing the unlocking rod 230 to rotate counterclockwise around the second reference axis until the rotating rod 270 is in contact with the pressure plate 300. Furthermore, the unlocking lever 230 rotates counterclockwise around the second reference axis, which will cause the hook 250 to rotate, causing the hook 250 to disengage from the hanging rod 221.

[0051] In a further embodiment, a portion of the unlocking lever 230 extending out of the cylinder 210 is connected to the cylinder 210 via a third elastic element 280. The third elastic element 280 is a tension spring.

[0052] The cylinder 210 has a groove 212, which is arranged radially along the cylinder 210. The upper end of the unlocking rod 230 passes through the groove 212 and extends out of the cylinder 210. The two ends of the groove 212 along the radial direction of the cylinder 210 are referred to as the first end and the second end, respectively. The first end is located on the side of the second end in the radial direction of the cylinder 210 away from the central axis of the cylinder 210. In the initial state, the unlocking rod 230 abuts against the first end of the groove 212.

[0053] Furthermore, both ends of the rotating rod 270 along the second reference axis are provided with locking pins 272, and the cylinder 210 is provided with a limiting rod 213. In the initial state, there is a gap between the locking pins 272 and the limiting rod 213 in the radial direction of the cylinder 210, and the rotating rod 270 can slide along the radial direction of the cylinder 210 to the side closer to the central axis of the cylinder 210 so that the limiting rod 213 abuts against the locking pins 272.

[0054] This embodiment incorporates a third elastic element 280, see [link / reference] Figure 14 and Figure 15 As shown, during the upward movement of the cylinder 210, if a clod of soil falls between the rotating rod 270 and the unlocking rod 230, the clod will tend to cause the rotating rod 270 and the unlocking rod 230 to move towards the side closer to the central axis of the cylinder 210 along the radial direction of the cylinder 210. That is, the unlocking rod 230 tends to move from the first end of the slide groove 212 to the second end of the slide groove 212. The movement of the unlocking rod 230 towards the side closer to the central axis of the cylinder 210 along the radial direction of the cylinder 210 will cause the unlocking rod 230 to rotate around the second reference axis, which may cause the hook 250 to detach from the hanging rod 221. Therefore, by setting the third elastic element 280, the compressive force of the clod of soil can be resisted, preventing the hook 250 from mis-locking with the hanging rod 221. Furthermore, if the compressive force of the clod of soil is too great, the locking post 272 will abut against the limiting rod 213, restricting the unlocking rod 230 from continuing to move and preventing the hook 250 from mis-locking with the hanging rod 221.

[0055] When the pressure plate 300 normally causes the rotating rod 270 to rotate, the locking pin 272 will rotate to a position that is not on the same vertical plane as the limiting rod 213, so that under normal circumstances the locking pin 272 will not abut against the rotating rod 270, nor will it restrict the unlocking rod 230 from sliding in the slide groove 212.

[0056] In a further embodiment, the unlocking rod 230 is hinged inside the cylinder 210 via a third pivot, and the unlocking rod 230 is disposed close to the inner peripheral wall of the cylinder 210. The axial direction of the third pivot is the direction of the second reference axis.

[0057] Furthermore, the unlocking rod 230 is divided into an upper section and a lower section, with the third pivot as the dividing point. The upper section is located above the lower section, and its length is greater than that of the lower section. The minimum distance at which the hanging rod 221 is moved radially along the cylinder 210 to disengage it from the hook 250 is called the first preset distance. The distance from the first end to the second end of the slide groove 212 is called the second preset distance, which is greater than the first preset distance. The distance between the locking pin 272 and the limiting rod 213 in the radial direction of the cylinder 210 is called the third preset distance, which is less than the first preset distance.

[0058] By positioning the unlocking rod 230 close to the inner circumferential wall of the cylinder 210, the impact of soil on the unlocking rod 230 when soil enters the cylinder 210 can be reduced, preventing damage to the unlocking rod 230. Furthermore, by ensuring the upper rod section is longer than the lower rod section and the second preset distance is greater than the first preset distance, during the upward movement of the cylinder 210, when the rotating rod 270 drives the unlocking rod 230 to rotate counterclockwise around the second reference axis (the unlocking rod 230 moves from the first end to the second end of the slide groove 212), the hook 250 disengages from the hanging rod 221 before the rotating rod 270 contacts the pressure plate 300. Additionally, ensuring the third preset distance is less than the first preset distance prevents the hook 250 from disengaging from the hanging rod 221 before the locking post 272 engages with the limiting rod 213.

[0059] Based on the above embodiments, the specific working process is as follows:

[0060] During construction, the cylinder 210 is first moved downwards while rotating around its own axis. At this time, the rotary drilling plate 220 installed at the lower end of the cylinder 210 will move synchronously with the cylinder 210, performing rotary drilling on the soil, allowing the soil to enter the cylinder 210 from the inlet. The sand hopper 200 is in its first state at this time. (See also...) Figures 4 to 6 As shown, during the downward rotary drilling process of the sand hopper 200, the rotary drilling plate 220 can rotate upward relative to the cylinder 210 around the first reference axis under the action of soil pressure. After the upper end face of the trigger rod 222 abuts against the lower end face of the hook 250, if the rotary drilling plate 220 continues to move upward, the trigger rod 222 will cause the hook 250 to rotate relative to the unlocking rod 230 around the second reference axis to the side away from the central axis of the cylinder 210, so that the hook 250 extends out of the opening 211. Subsequently, as the cylinder 210 continues to rotate and move downward, the hook 250 extending out of the cylinder 210 will agitate the surrounding soil, breaking the tight fit between the soil and the cylinder 210, avoiding excessive sealing between the soil and the cylinder 210, reducing the resistance when lifting the cylinder 210 later, making the cylinder 210 easier to pull out, and ensuring the normal operation of the rotary drilling rig.

[0061] After the downward rotary excavation is completed, the cylinder 210 moves upward relative to the machine body 100. After the soil pressure is lost, the hook 250 will be reset under the action of the first elastic element 240, so that the hook 250 can be engaged with the hanging rod 221 again, preventing the rotary excavator plate 220 from opening prematurely and causing soil leakage, and ensuring that the soil inside the cylinder 210 is retained.

[0062] During the upward movement of the cylinder 210 relative to the machine body 100, the sand-collecting hopper 200 is in the second state, see [reference]. Figures 7 to 13 As shown, the rotating rod 270 will first contact the pressure plate 300. After the rotating rod 270 contacts the pressure plate 300, as the cylinder 210 continues to move upward, the pressure plate 300 will apply pressure to the rotating rod 270, causing the rotating rod 270 to rotate relative to the unlocking rod 230 and gradually abut against the edge 310 of the pressure plate 300. When the rotating rod 270 abuts against the edge 310 of the pressure plate 300, as the cylinder 210 continues to move upward, the rotating rod 270 will be subjected to downward pressure from the pressure plate 300 and lateral pressure from the edge 310. This will cause the rotating rod 270 and the unlocking rod 230 to be subjected to a downward force. The rotating rod 270 will drive the unlocking rod 230 to rotate, causing the unlocking rod 230 to rotate counterclockwise around the second reference axis until the rotating rod 270 is in contact with the pressure plate 300. Furthermore, the unlocking rod 230 rotates counterclockwise around the second reference axis, which will drive the hook 250 to rotate, causing the hook 250 to disengage from the hanging rod 221 again. Under the action of its own weight and soil pressure, the rotary drilling plate 220 rotates downward around the first reference axis, and at this time the cylinder 210 comes to the ground, making it convenient to discharge the soil inside the cylinder 210.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A deep-hole rotary drilling rig for pile foundation construction, characterized in that: The system includes a machine body and a sand-collecting bucket. The sand-collecting bucket includes a cylindrical body, a rotary drilling plate, and an unlocking rod. The cylindrical body is vertically mounted on the machine body and is a tapered cylinder with a smaller top and a larger bottom. The cylindrical body can move up and down relative to the machine body and can rotate around its own axis relative to the machine body. The rotary drilling plate is rotatably mounted on the lower end of the cylindrical body around a first reference axis, which is perpendicular to the axis of the cylindrical body. An inlet is provided on the rotary drilling plate. The unlocking rod is inclined relative to the vertical direction and rotatably mounted on the cylindrical body around a second reference axis, which is perpendicular to the axis of the unlocking rod. A hook is rotatably connected to the lower end of the unlocking rod via a first elastic element, and the hook can rotate around the second reference axis relative to the unlocking rod. An opening is provided on the peripheral wall of the cylindrical body, and the hook can extend out of the opening when rotating around the second reference axis relative to the unlocking rod. A hanging rod is provided on the upper end face of the rotary drilling plate, and the hook is initially engaged with the hanging rod. The sand dredging bucket has a first state and a second state. In the first state, the rotary drilling plate rotates upward relative to the cylinder about the first reference axis, and the hook rotates relative to the unlocking rod about the second reference axis to disengage from the hanging rod, so that the hook extends out of the opening. In the second state, the unlocking rod rotates relative to the cylinder about the second reference axis, and drives the hook to rotate about the second reference axis to disengage from the hanging rod, and the rotary drilling plate rotates downward relative to the cylinder about the first reference axis.

2. The deep-hole rotary drilling rig for pile foundation construction according to claim 1, characterized in that: In the initial state, there is a gap between the side of the rotary drilling plate where the hook and the hanging rod are engaged and the cylinder.

3. The deep-hole rotary drilling rig for pile foundation construction according to claim 2, characterized in that: A trigger rod is provided on the upper end face of the rotary drilling plate. The rotary drilling plate rotates upward relative to the cylinder around the first reference axis so that the upper end face of the trigger rod abuts against the lower end face of the hook, and the lower end face of the hook is an inclined surface.

4. The deep-hole rotary drilling rig for pile foundation construction according to claim 1, characterized in that: It also includes a pressure plate, which is mounted on the machine body and located directly above the cylinder. The cylinder is movable up and down relative to the pressure plate, and when the cylinder moves up relative to the pressure plate, it can abut against the pressure plate and cause the unlocking rod to rotate relative to the cylinder about the second reference axis.

5. A deep-hole rotary drilling rig for pile foundation construction according to claim 4, characterized in that: The pressure plate has an edge in the circumferential direction and the edge is set in the vertical direction; the upper end of the unlocking rod extends out of the cylinder and is rotatably connected to the rotating rod through the second elastic element; both the unlocking rod and the rotating rod can be slidably set on the cylinder in the radial direction of the cylinder, and the rotating rod is inclined relative to the unlocking rod. The end of the unlocking rod extending out of the cylinder can abut against the edge and cause the unlocking rod to rotate around the second reference axis through the edge.

6. A deep-hole rotary drilling rig for pile foundation construction according to claim 5, characterized in that: The rotating rod is rotatably connected to the unlocking rod via the second rotating shaft. An anti-rotation rod is provided on the rotating rod. The axial direction of the anti-rotation rod and the axial direction of the second rotating shaft are both parallel to the direction of the second reference axis. The anti-rotation rod is located on the side of the second rotating shaft in the radial direction of the cylinder, close to the central axis of the cylinder.

7. A deep-hole rotary drilling rig for pile foundation construction according to claim 5, characterized in that: The section of the unlocking lever extending out of the cylinder is connected to the cylinder via a third elastic element.

8. A deep-hole rotary drilling rig for pile foundation construction according to claim 5, characterized in that: A groove is provided on the cylinder body, which is set along the radial direction of the cylinder body. The upper end of the unlocking rod passes through the groove and extends out of the cylinder body.

9. A deep-hole rotary drilling rig for pile foundation construction according to claim 5, characterized in that: Both ends of the rotating rod along the second reference axis are provided with locking pins, and the cylinder is provided with a limiting rod. In the initial state, there is a gap between the locking pins and the limiting rod in the radial direction of the cylinder, and the rotating rod can slide along the radial direction of the cylinder towards the side closer to the central axis of the cylinder so that the limiting rod abuts against the locking pins.

10. A deep-hole rotary drilling rig for pile foundation construction according to claim 1, characterized in that: The unlocking rod is hinged to the cylinder body via a third pivot, and the unlocking rod is positioned close to the inner circumferential wall of the cylinder body. The axial direction of the third pivot is the direction of the second reference axis.

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