Rotary drilling rig

Abstract

The utility model discloses a rotary drilling rig which comprises a walking mechanism, a main machine, a mast, a drill rod, a power head and a pressurizing device. Wherein the pressurizing device comprises a driving part, a driving wheel, a chain and a tensioning part, the driving part is used for driving the driving wheel to rotate, the chain is wound around the driving wheel so as to be driven by the rotating driving wheel to move circularly, one end of the chain is connected to the power head, the other end of the chain is connected to one end of the tensioning part, and the other end of the tensioning part is connected to the power head; the tensioning piece is telescopically arranged to tension the chain. According to the rotary drilling rig, a chain structure is adopted to pressurize the power head, the pressurization stroke is long, various construction conditions can be met, the chain bearing capacity is large, the pressurization force is large, flexible pressurization is achieved, impact force and vibration of a drilling tool can be absorbed, and the rotary drilling rig is suitable for construction of various soft and hard stratums; and the pressurizing piece can provide stable tensile force, so that the stability and the safety during pressurizing are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of foundation construction, in particular to a rotary drilling rig. Background Technique

[0002] A rotary drilling rig is a construction machine suitable for hole-forming operations in building foundation projects. It is mainly suitable for construction in soil layers such as sandy soil, cohesive soil, and silty soil. It is widely used in various foundation construction projects such as cast-in-place piles, diaphragm walls, and foundation reinforcement. Generally, it adopts a hydraulic crawler telescopic chassis, a self-rising and foldable drill mast, a telescopic drill pipe, with vertical automatic detection and adjustment, digital display of hole depth, etc.

[0003] At present, the power heads of rotary drilling rigs usually adopt two methods: cylinder pressurization and winch pressurization. Please refer to Figure 1 , for cylinder pressurization, which is rigid pressurization. Its structure is to arrange the pressurizing cylinder on the mast, with the piston rod end fixed on the power head, and the power head is pressurized by the extension of the cylinder rod. Please refer to Figure 2 and Figure 3 , for winch pressurization, which is flexible pressurization. Its pressurizing device consists of a winch, a steel wire rope, and a pulley block. The winch has ropes coming out at both ends. After the two ends of the steel wire rope are wound around the pulleys on the power head, the rope ends are fixed on the mast. By retracting and releasing the steel wire rope by the winch, the functions of lifting the power head and pressurizing and lowering it are driven, and its pressurizing stroke can reach the full stroke of the mast.

[0004] However, for a rotary drilling rig with cylinder pressurization, due to its own structural characteristics, its pressurizing stroke is short, which cannot meet the requirements of long casing operations, and cannot absorb the impact force and vibration of the drill tool when drilling rocks, and is more suitable for drilling operations in soft strata; at the same time, because the working conditions of the rotary drilling rig are harsh, the operation intensity is high, and vibration and impact conditions are common, it bears complex fatigue alternating stresses, and the cylinder body is prone to fatigue failure and oil leakage. For a rotary drilling rig with winch pressurization, it can meet the requirements of long casing operations, but due to its relatively complex structure and large flexibility of the steel wire rope, it is easy to interfere and rub with other structural parts, easy to wear, and there are safety hazards. The steel wire rope is a vulnerable part and needs to be regularly maintained and replaced, and the later maintenance cost is relatively high. Due to the bearing capacity of the steel wire rope, it cannot bear a large pressing force. Summary of the Utility Model

[0005] In view of this, the purpose of the present utility model is to provide a rotary drilling rig to meet the construction requirements of a long pressurizing stroke, and be able to absorb the impact force and vibration of the drill tool, and meet the construction requirements of hard and soft strata.

[0006] To achieve the above object, the utility model provides a rotary drilling rig, which includes a traveling mechanism, a main machine, a mast, a drill pipe, a power head and a pressurizing device. The main machine is arranged on the traveling mechanism, the mast is connected to the main machine, the power head and the follower frame are movably arranged on the mast, and the power head is sleeved on the drill pipe, and the follower frame is fixedly connected to the drill pipe. Wherein, the pressurizing device includes a driving member, a driving wheel, a chain and a tensioning member. The driving member is used to drive the driving wheel to rotate, the chain is wound around the driving wheel to be driven to move circularly by the rotating driving wheel, one end of the chain is connected to the power head, the other end is connected to one end of the tensioning member, and the other end of the tensioning member is connected to the power head. The tensioning member is telescopically arranged to tension the chain.

[0007] Optionally, one end of the chain is connected to the bottom end of the power head, and the other end of the chain is connected to the top end of the power head through the tensioning member.

[0008] Optionally, the pressurizing device further includes a guide wheel, and the chain is wound around the guide wheel; both the driving wheel and the guide wheel are arranged on the mast, the driving member and the driving wheel are arranged at the bottom end of the mast, and the guide wheel is arranged at the top end of the mast.

[0009] Optionally, the pressurizing device further includes a tensile force detecting element, which is used to detect the tensile force of the chain, and one end of the chain is connected to the bottom end of the power head through the tensile force detecting element.

[0010] Optionally, the driving member is a driving motor, the rotary drilling rig further includes a controller and a hydraulic system for supplying oil to the driving member. The hydraulic system includes a proportional relief valve. The tensile force detecting element is connected to the controller and is used to transmit the detected tensile force of the chain to the controller. The controller is used to adjust the set pressure of the proportional relief valve according to the tensile force.

[0011] Optionally, a selection switch is arranged on the main machine, and the selection switch includes a low gear, a medium gear and a high gear.

[0012] Optionally, the pressurizing device further includes a trailing wheel, the trailing wheel is arranged near the bottom end of the mast, the chain is wound around the trailing wheel, and the two trailing wheels are respectively arranged upstream and downstream of the driving wheel.

[0013] Optionally, a cavity is formed in the mast, and the chain can pass through the cavity of the mast.

[0014] Optionally, the tensioning member is a tensioning oil cylinder, the cylinder barrel of the tensioning oil cylinder is connected to the power head, and the piston end is connected to the chain.

[0015] Optionally, the rotary drilling rig includes a first state, a second state, and a third state. In the first state, the follower frame is located near the top of the mast, the power head is located near the top of the mast, and is located at one end of the drill pipe close to the follower frame; in the second state, the follower frame is located near the top of the mast, the power head is located near the bottom of the mast, and is located at one end of the drill pipe away from the follower frame; in the third state, the power head is located at the bottom of the mast, and the follower frame is located near the bottom of the mast.

[0016] In the rotary drilling rig of the present application, a chain structure is used to pressurize the power head. The pressurization stroke is long, which can meet various construction conditions. Moreover, the chain has a large bearing capacity and a large pressing force, and is a flexible pressurization, which can absorb the impact force and vibration of the drilling tool, and is suitable for construction in various soft and hard strata; the pressurizing member can provide a stable tension force to ensure the stability and safety during pressurization. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a rotary drilling rig with an oil cylinder pressurization method.

[0019] Figure 2 It is the front view of a rotary drilling rig with a hoist pressurization method.

[0020] Figure 3 It is Figure 2 the side view of the shown rotary drilling rig.

[0021] Figure 4 It is the state diagram of the rotary drilling rig of an embodiment of the present invention when not pressurized.

[0022] Figure 5 It is Figure 4 the state diagram of the shown rotary drilling rig when pressurized.

[0023] Figure 6 It is Figure 4 the state diagram of the shown rotary drilling rig when pressurized to the limit position. Detailed Embodiments

[0024] The following will describe in detail specific embodiments of the present utility model in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the description of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present utility model.

[0025] In the description of the present utility model, unless otherwise clearly defined and limited, terms such as "set", "installed", "connected", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0026] Terms such as "first", "second", "third", etc. are only used to distinguish numerical values or elements with similar attributes, rather than indicating or implying relative importance or a specific order.

[0027] The term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion. In addition to the listed elements, it may also include other elements not specifically listed.

[0028] An embodiment of the present utility model provides a rotary drilling rig. Please refer to Figure 4 , a rotary drilling rig in an embodiment includes a traveling mechanism 11, a main machine 13, a mast 15, a drill pipe 17, a power head 19, and a pressurizing device. The traveling mechanism 11 is used to drive the rotary drilling rig to move. The main machine 13 is provided on the traveling mechanism 11. The mast 15 is connected to the main machine 13. The power head 19 and the follower frame 23 are movably provided on the mast 15. The power head 19 is sleeved on the drill pipe 17. The follower frame 23 is fixedly connected to the drill pipe 17. One end of the drill pipe 17 is connected to a steel wire rope 24 that is lifted or lowered by a hoisting mechanism. The drill pipe 17 can be lifted and lowered under the traction of the steel wire rope 24. Among them, the pressurizing device includes a driving member 211, a driving wheel 213, a chain 215, and a tensioning member 217. The driving member 211 is used to drive the driving wheel 213 to rotate. The chain 215 is wound around the driving wheel 213 to be driven to move in a cycle by the rotating driving wheel 213. One end of the chain 215 is connected to the power head 19, and the other end is connected to one end of the tensioning member 217. The other end of the tensioning member 217 is connected to the power head 19. The tensioning member 217 is telescopically arranged to tension the chain 215.

[0029] In the rotary drilling rig of this embodiment, a chain structure is adopted to pressurize the power head. The pressurization stroke is long, which can meet various construction conditions. Moreover, the chain has a large bearing capacity and a large pressing force, and is a flexible pressurization, which can absorb the impact force and vibration of the drill tool, and is suitable for construction in various soft and hard strata; the pressurizing member can provide a stable tension force to ensure the stability and safety during pressurization.

[0030] In this embodiment, one end of the chain 215 is connected to the bottom end of the power head 19, and the other end of the chain 215 is connected to the top end of the power head 19 through the tensioning member 217.

[0031] In this embodiment, the driving member 211 can specifically be a driving motor. It can be understood that the driving member 211 can also be other driving members such as an electric motor, as long as it can drive the driving wheel 213 to rotate.

[0032] In this embodiment, the pressurizing device further includes a guide wheel 219, and the chain 215 is wound around the guide wheel 219. Specifically, both the driving wheel 213 and the guide wheel 219 are arranged on the mast 15. The driving member 211 and the driving wheel 213 are arranged at the bottom end of the mast 15, and the guide wheel 219 is arranged at the top end of the mast 15. Specifically, one end of the chain 215 is connected to the power head 19 and then bypasses the driving wheel 213 first and then the guide wheel 219, and the other end is connected to the power head 19 through the tensioning member 217. By arranging the driving wheel 213 and the driving member 211 at the bottom end of the mast 15, it is convenient for installation and later maintenance.

[0033] Specifically, a cavity can be opened in the mast 15, and the chain 215 can pass through the cavity of the mast 15. In this way, the pressurizing device does not need to occupy too much space.

[0034] In this embodiment, the pressurizing device further includes a trailing wheel 221, and the trailing wheel 221 is arranged near the bottom end of the mast 15, and the chain 215 is wound around the trailing wheel 221. Specifically, the two trailing wheels 221 are respectively arranged upstream and downstream of the driving wheel 213, that is, the chain 215 bypasses one trailing wheel 221, the driving wheel 213 and the other trailing wheel 221 in sequence. The trailing wheel 211 can, on the one hand, tension the chain 215 to a certain extent, and on the other hand, widen the width of the chain 215.

[0035] In this embodiment, the chain 215 can be a roller chain. The model of the chain 215 can be selected according to the requirements of the pressing force.

[0036] In this embodiment, the tensioning member 217 can specifically be a tensioning cylinder. Specifically, the cylinder barrel of the tensioning cylinder is connected to the power head 19, and the piston end is connected to the chain 215. Of course, it can also be the other way around. It can be understood that the tensioning member 217 can also be other tensioning members such as a spring and a threaded adjusting member (the threaded adjusting member can include two parts connected by threads, one part is connected to the chain, and the other part is connected to the power head).

[0037] In this embodiment, the pressurizing device further includes a tensile force detecting element 223 for detecting the tensile force applied to the chain 215. Specifically, one end of the chain 215 is connected to the bottom end of the power head 19 through the tensile force detecting element 223. Specifically, the tensile force detecting element 223 can be a tensile force sensor.

[0038] In this embodiment, the rotary drilling rig further includes a controller and a hydraulic system for supplying oil to the driving member 211. The hydraulic system includes a proportional relief valve. The tensile force detecting element 223 is connected to the controller and is used to transmit the detected tensile force of the chain 215 to the controller. The controller is used to adjust the set pressure of the proportional relief valve according to the tensile force, so as to adjust the pressure oil output to the driving member 211, and further realize the adjustment of the magnitude of the applied pressure. Specifically, the controller can include a comparator, which automatically outputs corresponding electrical signals (such as high level, low level) by comparing the magnitudes of the tensile forces, and controls the control current of the proportional relief valve through the electrical signals, so as to realize the adjustment of the set pressure of the proportional relief valve. Of course, the controller can also perform stepless adjustment on the set pressure of the proportional relief valve according to the magnitude of the tensile force.

[0039] In this embodiment, a selection switch is provided on the main machine 13, and the selection switch includes a low gear, a medium gear, and a high gear. Before work, the low gear, medium gear, or high gear can be selected through the selection switch according to the requirement for the magnitude of the applied pressure.

[0040] In this embodiment, the rotary drilling rig further includes a luffing mechanism 25, and the mast 15 is connected to the main machine 13 through the luffing mechanism 25. Through the luffing mechanism 25, the mast 15 can realize luffing adjustment.

[0041] In this embodiment, the rotary drilling rig further includes a drilling tool 27, and the drilling tool 27 is arranged at the bottom of the drill pipe 17. During drilling, the rotary drilling rig drills into the formation through the drilling tool 27.

[0042] When the driving member 211 works to drive the driving wheel 213 to rotate clockwise, the lower chain 215 of the power head 19 moves downward, pulling the power head 19 to slide downward on the mast 15. Synchronously, the upper chain 215 of the power head 19 moves downward, and the upper chain 215 of the power head 19 is relaxed, thereby realizing the pressurizing function; when the driving member 211 works to drive the driving wheel 213 to rotate counterclockwise, the upper chain 215 of the power head 19 moves upward, pulling the power head 19 to slide upward on the mast 15. Synchronously, the lower chain 215 of the power head 19 moves upward, and the lower chain 215 of the power head 19 is relaxed, thereby realizing the lifting function.

[0043] Please refer to Figure 4 , the follower frame 23 is located near the top end of the mast 15, and the power head 19 is located near the top end of the mast 15 and is located at one end of the drill pipe 17 close to the follower frame 23. At this time, it is the state when the pressurizing device is not pressurized. Please refer to Figure 5, the follower frame 23 is located near the top of the mast 15. As the pressure device applies pressure, the power head 19 gradually moves to near the bottom of the mast 15 and moves towards one end of the drill pipe 17 away from the follower frame 23. At this time, the pressure device is applying pressure to the power head 19. Please refer to Figure 6 , the pressure device continues to apply pressure, the power head 19 gradually moves to the bottom of the mast 15, and the drill pipe 17 gradually drills in, driving the follower frame 23 to move downward along the mast 15 together until it reaches the limit position where the pressure device applies pressure to the power head 19. That is, the rotary drilling rig includes a first state, a second state, and a third state. In the first state, the follower frame 23 is located near the top of the mast 15, and the power head 19 is located near the top of the mast 15 and at one end of the drill pipe 17 close to the follower frame 23; in the second state, the follower frame 23 is located near the top of the mast 15, the power head 19 is located near the bottom of the mast 15 and at one end of the drill pipe 17 away from the follower frame 23; in the third state, the power head 19 is located at the bottom of the mast 15, and the follower frame 23 is located near the bottom of the mast 15.

[0044] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A rotary drilling rig, characterized in that: The invention comprises a walking mechanism (11), a main machine (13), a mast (15), a drill rod (17), a power head (19) and a pressurizing device, wherein the main machine (13) is arranged on the walking mechanism (11), the mast (15) is connected to the main machine (13), the power head (19) and a follower frame (23) are movably arranged on the mast (15), the power head (19) is sleeved on the drill rod (17), and the follower frame (23) is fixedly connected to the drill rod (17); wherein the pressurizing device comprises a driving member (211), a driving wheel (213 ), a chain (215) and a tensioning member (217), the driving member (211) is used to drive the driving wheel (213) to rotate, the chain (215) is wound around the driving wheel (213) to be driven by the rotating driving wheel (213) to move cyclically, one end of the chain (215) is connected to the power head (19), and the other end is connected to one end of the tensioning member (217), the other end of the tensioning member (217) is connected to the power head (19), and the tensioning member (217) is telescopically arranged to tighten the chain (215).

2. The rotary drilling rig according to claim 1, characterized in that: One end of the chain (215) is connected to the bottom end of the power head (19), and the other end of the chain (215) is connected to the top end of the power head (19) through the tensioning member (217).

3. The rotary drilling rig according to claim 2, characterized in that: The pressurizing device further comprises a guide wheel (219), and the chain (215) is wound around the guide wheel (219); the driving wheel (213) and the guide wheel (219) are both arranged on the mast (15), the driving member (211) and the driving wheel (213) are arranged at the bottom end of the mast (15), and the guide wheel (219) is arranged at the top end of the mast (15).

4. The rotary drilling rig according to claim 3, characterized in that: The pressurizing device further comprises a tension detection element (223), wherein the tension detection element (223) is used to detect the tension applied to the chain (215), and one end of the chain (215) is connected to the bottom end of the power head (19) via the tension detection element (223).

5. The rotary drilling rig according to claim 4, characterized in that: The driving member (211) is a driving motor. The rotary drilling rig also includes a controller and a hydraulic system for supplying oil to the driving member (211). The hydraulic system includes a proportional relief valve. The tension detection element (223) is connected to the controller and is used to transmit the detected tension of the chain (215) to the controller. The controller is used to adjust the set pressure of the proportional relief valve according to the tension.

6. The rotary drilling rig according to claim 5, characterized in that: The host (13) is provided with a selection switch, and the selection switch includes low range, middle range and high range.

7. The rotary drilling rig according to claim 3, characterized in that: The pressurizing device further comprises a sprocket wheel (221), wherein the sprocket wheel (221) is arranged near the bottom end of the mast (15), the chain (215) is wound around the sprocket wheel (221), and the two sprocket wheels (221) are respectively arranged upstream and downstream of the driving wheel (213).

8. The rotary drilling rig according to claim 1, characterized in that: A cavity is provided in the mast (15), and the chain (215) can pass through the cavity of the mast (15).

9. The rotary drilling rig according to claim 1, characterized in that: The tensioning member (217) is a tensioning oil cylinder, the cylinder barrel of the tensioning oil cylinder is connected to the power head (19), and the piston end is connected to the chain (215).

10. The rotary drilling rig according to claim 1, characterized in that: The rotary drilling rig comprises a first state, a second state and a third state. In the first state, the follower frame (23) is located near the top end of the mast (15), the power head (19) is located near the top end of the mast (15) and is located at one end of the drill rod (17) near the follower frame (23); in the second state, the follower frame (23) is located near the top end of the mast (15), the power head (19) is located near the bottom end of the mast (15) and is located at one end of the drill rod (17) away from the follower frame (23); in the third state, the power head (19) is located at the bottom end of the mast (15), and the follower frame (23) is located near the bottom end of the mast (15).

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