A fully hydraulic power head drill suitable for drilling in loose and broken strata

Abstract

The present invention discloses a fully hydraulic power head drill suitable for drilling in loose and broken strata. It includes a chassis assembly, a centering gripper, a pipe ramming machine, a power head, a drill rig guide rail, a fixed pulley block, a support oil cylinder and a feed oil cylinder; the power head is fixedly connected to the feed oil cylinder and is slidably connected to the drill rig guide rail; the drill rig guide rail is installed on the chassis assembly; the fixed pulley block is fixed at the top of the drill rig guide rail to change the direction of the wire rope and form a traction mechanism in cooperation with the winch on the drill rig, and when necessary, pull the power head and the drill pipe string to the starting position; the support oil cylinder and the feed oil cylinder are hinged and fixed on the chassis assembly. The present invention has the advantages of realizing the rotary feed function of an ordinary core drill while realizing impact rotary compound drilling and improving the working efficiency of pipe ramming drilling.

Description

Technical Field

[0001] The present invention relates to the field of geological equipment, and particularly to a full-hydraulic power head drill rig, and more specifically, it is a full-hydraulic power head drill rig suitable for drilling in loose and broken strata. Background Art

[0002] When drilling in loose and broken strata such as Quaternary overburden and fault-developed zones, due to poor rock cementation, loose and fragile, the hole wall is prone to lose stability under the adverse effects of mud erosion and drill tool vibration, resulting in downhole accidents such as hole collapse and mud loss, threatening the hole wall safety and core recovery rate of the drilling project. At present, for drilling construction in loose and broken strata, the casing drilling method is widely used on site, and the solution of using a downhole hydraulic hammer for impact rotary drilling is adopted, that is, using a double-tube drill tool (a casing string is sleeved outside the drill pipe string, the casing string does not rotate, and is connected to the downhole drill tool by a pipe shoe, etc., and the downhole drill tool drives the casing string to extend downward) for synchronous drilling. After drilling to the predetermined hole position, the drill pipe string is lifted, and the casing string is left in the hole to support the hole wall and protect the borehole; in addition, by using the vibration and impact action of the hydraulic hammer, the complex strata can be quickly passed through to improve the drilling efficiency.

[0003] The solution of casing drilling combined with a downhole hydraulic hammer can effectively deal with loose and broken strata, but there are still some problems at present. For example, the jacking of the casing string completely depends on the drive of the downhole drill tool, there is no special equipment on the surface, and the efficiency is low; the disassembly and assembly of the casing need to be completed manually, which is time-consuming and laborious; the existing full-hydraulic power head drill rig does not have the ability to pull out the casing string and needs to be equipped with other auxiliary equipment; the downhole hydraulic hammer that plays the role of vibration and impact needs to be designed and selected according to the borehole size and does not meet the requirements of multi-stage boreholes.

[0004] Therefore, it is necessary to develop a drill rig suitable for drilling in loose and broken strata that can realize the rotary feed function of an ordinary core drill rig while realizing impact rotary compound drilling and improving the working efficiency of casing drilling. Summary of the Invention

[0005] The purpose of the present invention is to provide a full-hydraulic power head drill rig suitable for drilling in loose and broken strata. While realizing the rotary feed function of an ordinary core drill rig, a pipe ramming machine is added, and a power head with a hydraulic vibration and impact function is adopted, which can apply impact work to the downhole drill tool through surface equipment, and no longer requires a downhole hydraulic hammer, so as to realize impact rotary compound drilling and simplify the structure of the downhole drill tool; in addition, the pipe ramming machine is driven by a separate hydraulic source and independently controlled, with strong ability, and can directly pull out or press in the casing string, no longer relying on the drive of the downhole drill tool, and can also disassemble and assemble the casing, greatly improving the working efficiency of casing drilling; overcoming the defect that the existing downhole hydraulic hammer that plays the role of vibration and impact needs to be designed and selected according to the borehole size and does not meet the requirements of multi-stage boreholes.

[0006] To achieve the above object, the technical solution of the present invention is as follows: A fully hydraulic power head drill suitable for drilling in loose and broken strata, characterized in that it includes a chassis assembly, a centering gripper, a pipe ramming machine, a power head, a drill guide rail, a fixed pulley set, a support cylinder and a feed cylinder;

[0007] The power head is fixedly connected to the feed cylinder and slidably connected to the drill guide rail;

[0008] The upper end of the support cylinder is connected to the drill guide rail;

[0009] The drill guide rail is installed on the chassis assembly;

[0010] The fixed pulley set is fixed at the top of the drill guide rail; it changes the direction of the wire rope and forms a traction mechanism in cooperation with the winch on the drill to pull the power head and the drill pipe string to the starting position when necessary;

[0011] The lower ends of the support cylinder and the feed cylinder are both hinged and fixed on the chassis assembly.

[0012] In the above technical solution, a clamping cylinder is arranged inside the centering gripper;

[0013] The centering gripper is fixed on the centering gripper connecting plate by screws.

[0014] In the above technical solution, a clamping cylinder is arranged inside the pipe ramming machine;

[0015] Three cylinders are hinged outside the pipe ramming machine, one of which is a pipe ramming machine unscrewing cylinder connected to the clamping cylinder, and the other two are both pipe ramming machine feed cylinders. The two pipe ramming machine feed cylinders are respectively fixed on the centering gripper and the pipe ramming machine feed cylinder hinge support;

[0016] A lower hexagonal guide rail sliding sleeve is welded on the outer shell of the pipe ramming machine.

[0017] In the above technical solution, a hydraulic vibration impact device is installed inside the power head;

[0018] An upper hexagonal guide rail sliding sleeve is welded on the outer shell of the power head;

[0019] The power head support plate assembly is hinged to the power head;

[0020] The power head support plate assembly is fixedly connected to the feed cylinder by screws.

[0021] In the above technical solution, the drill guide rail is hinged to the chassis assembly through two connecting shafts; the connecting shafts are welded on the guide rail welding pads;

[0022] The fixing plate, the guide rail welding pad and the drill guide rail are fixedly connected by screws.

[0023] The present invention has the following advantages:

[0024] (1) While realizing the rotary feed function of a common core drill rig, the present invention adds a pipe ramming machine. By using a power head with hydraulic vibration impact function, the impact work can be applied to the downhole drill string through surface equipment, and there is no need for a downhole hydraulic hammer. Thus, the impact rotary compound drilling can be achieved, simplifying the structure of the downhole drill string. In addition, the pipe ramming machine is driven by a separate hydraulic source and independently controlled, with strong capabilities. It can directly pull out or press in the casing string without relying on the driving effect of the downhole drill string, and can also unscrew and screw on the casing, greatly improving the working efficiency of pipe following drilling.

[0025] (2) This drill rig can adopt various drilling methods and be applied to different scenarios, such as engineering survey construction, surface core drilling, and hydrogeological well hole forming operations. It is especially suitable for drilling operations in loose, broken, and complex strata. The drill rig can select rotary drilling method, percussion drilling method, impact rotary drilling method, pipe following drilling method or directly install a casing for protection in an existing borehole according to project objectives, formation characteristics and other constraints.

[0026] (3) Adopting the modular design method, each component of the drill rig can be disassembled for transportation and then installed and used after arriving at the site. The weight of a single modular component does not exceed 80 kilograms. Such a design greatly improves the portability of the drill rig, facilitates the transportation and handling of the drill rig, and expands the application space of the drill rig in complex scenarios such as mountains, jungles, and cities. Description of the Drawings

[0027] Figure 1 is the front view of the present invention.

[0028] Figure 2 is the side view of the present invention.

[0029] Figure 3 is the schematic diagram of the connection of the chassis assembly, drill rig guide rail, feed cylinder in the present invention, as well as the fixed connection structure of the pipe ramming machine and the centering gripper.

[0030] Figure 4 is the connection schematic diagram of the pipe ramming machine and the centering gripper in the present invention.

[0031] Figure 5 is the connection relationship diagram of the bottom of the drill rig guide rail in the present invention.

[0032] Figure 6 is the top view structure schematic diagram of the present invention.

[0033] Figure 7 is Figure 1 the enlarged view of A in

[0034] Figure 8 is Figure 1 the enlarged view of B in

[0035] Figure 9 This is a schematic three-dimensional structure diagram of the pipe ramming machine in the present invention.

[0036] Figure 10 It is Figure 9 a sectional view of.

[0037] In Figure 4 , Figure 9 , Figure 10 , A represents the hinge shaft of the pipe ramming machine; Figure 9 , Figure 10 , B represents the outer shell of the pipe ramming machine.

[0038] In the figure, 1 - chassis assembly, 2 - centering gripper, 3 - pipe ramming machine, 4 - power head assembly, 5 - drill rig guide rail, 6 - fixed pulley block, 7 - support oil cylinder, 8 - feed oil cylinder, 9 - upper hexagonal guide rail sliding sleeve, 10 - power head support plate assembly, 11 - lower hexagonal guide rail sliding sleeve, 12 - pipe ramming machine feed oil cylinder, 13 - pipe ramming machine screwing and unscrewing oil cylinder, 14 - clamping oil cylinder, 15 - pipe ramming machine feed oil cylinder hinge support, 16 - centering gripper connecting plate, 17 - feed oil cylinder hinge seat shoe, 18 - hinge shaft support plate, 19 - connecting shaft, 20 - guide rail welding pad, 21 - fixing plate. Specific embodiments

[0039] The following will describe in detail the implementation of the present invention with reference to the accompanying drawings. However, they do not constitute a limitation to the present invention and are only for illustration purposes. At the same time, the advantages of the present invention will be made clearer and easier to understand through the description.

[0040] The power head function in the present invention adds a vibration and impact function. Structurally, it combines the structure of a hydraulic vibrator, and at the same time adds a pipe ramming machine, which can be used for the implementation of the casing drilling process. The present invention is aimed at surface drilling and hole formation in loose and broken strata, and combines the casing drilling process to quickly drill through the loose and broken strata.

[0041] Referring to the accompanying drawings, it can be seen that: a fully hydraulic power head drill rig suitable for drilling in loose and broken strata, the drill rig main body adopts a modular design method, and the whole machine is composed of several main components;

[0042] It includes a chassis assembly 1, a centering gripper 2, a pipe ramming machine 3, a power head assembly 4, a drill rig guide rail 5, a fixed pulley block 6, a support oil cylinder 7 and a feed oil cylinder 8; the chassis assembly 1 is the drill rig base and supports other components;

[0043] The centering gripper 2 is fixedly installed on the centering gripper connecting plate 16 through screws, and the centering gripper connecting plate 16 is hinged to the connecting shaft 19;

[0044] The upper and lower end faces of the pipe ramming machine 3 are inserted with a pipe ramming machine hinge shaft, whose function is to limit the translational movement of the pipe ramming machine 3. The pipe ramming machine hinge shaft is fixedly connected by screws to the upper and lower clamping plates of the lower hexagonal guide rail sliding sleeve 11. The lower hexagonal guide rail sliding sleeve 11 is sleeved on the sliding guide rail and can slide up and down along the guide rail;

[0045] The centering gripper 2 and the pipe ramming machine 3 are connected by the pipe ramming machine feed cylinder 12. There are two pipe ramming feed cylinders 12, which are symmetrically and flush in position and synchronously extend and retract. One cylinder barrel is fixedly installed on the centering gripper 2, and the other cylinder barrel is fixedly installed on the guide rail welding pad 20; the two piston rods are hinged to the pipe ramming machine 3, and the pipe ramming machine 3 slides up and down along the guide rail under the push of the piston rods.

[0046] The power head assembly 4 consists of a power head, a hexagonal guide rail sliding sleeve 9, and a power head support plate assembly 10. The power head is fixedly connected to the feed cylinder 8 and is slidably connected to the drilling rig guide rail 5; the hexagonal guide rail sliding sleeve 9 is welded to the outer shell of the power head support plate assembly 10, which plays a limiting role, enabling the power head support plate assembly 10 to only slide up and down along the drilling rig guide rail 5 and not rotate or translate;

[0047] The drilling rig guide rail 5 is installed on the chassis assembly 1;

[0048] The fixed pulley block 6 is fixed to the top of the drilling rig guide rail 5 (i.e., a steel wire rope passes through the fixed pulley block 6, and the function of the steel wire rope is to lift the drill tool in the borehole), changing the direction of the steel wire rope and forming a traction mechanism in combination with the winch on the drilling rig to pull the power head and the drill pipe string to the starting position according to the use requirements; the fixed pulley block 6 is used to salvage the core barrel in the borehole in the wireline coring process;

[0049] The support cylinder 7 and the feed cylinder 8 are hinged and fixed to the chassis assembly 1. The piston rod of the support cylinder 7 is hinged to the drilling rig guide rail 5. The extension and retraction of the piston rod of the support cylinder 7 drive the main body of the drilling rig to rotate around the connecting shaft 19. The cylinder barrel of the feed cylinder 8 is welded to the power head assembly 4, and the extension and retraction of the feed cylinder drive the power head assembly 4 to move up and down; the support cylinder 7 drives the main body structure of the drilling rig to rotate around the connecting shaft 19 by the extension and retraction of the piston rod, changing the opening direction.

[0050] Further, a clamping cylinder 14 is arranged inside the centering gripper 2,

[0051] The centering gripper 2 is fixed to the centering gripper connecting plate 16 by screws to fixedly install the centering gripper and make it rigidly connected to the main body structure of the drilling rig.

[0052] Furthermore, a pair of clamping cylinders 14 are provided inside the pipe ramming machine 3 (two clamping cylinders are respectively provided inside the centering gripper 2 and the pipe ramming machine 3) for fixedly clamping the casing passing through the central hole of the pipe ramming machine 3. The pipe ramming machine is hinged between the upper and lower clamping plates of the lower hexagonal guide rail sliding sleeve 11 and can rotate freely. The hinge shaft of the pipe ramming machine is threadedly connected to the lower hexagonal guide rail sliding sleeve 11. Three cylinders are hinged on the lower hexagonal guide rail sliding sleeve 11, one of which is the pipe ramming machine unscrewing cylinder 13. The other end of the unscrewing cylinder 13 is hinged to the casing of the pipe ramming machine. The piston rod of the pipe ramming machine unscrewing cylinder 13 can stretch and drive the pipe ramming machine to rotate; the other two are both pipe ramming machine feeding cylinders 12. The two pipe ramming machine feeding cylinders 12 are respectively fixed on the centering gripper 2 and the pipe ramming machine feeding cylinder hinge support 15. The two pipe ramming machine feeding cylinders 12 act synchronously to drive the pipe ramming machine to move up and down;

[0053] The lower hexagonal guide rail sliding sleeve 11 is fixedly connected to the internal stator of the pipe ramming machine by screws. The pipe ramming machine is installed between the two clamping plates and can rotate around the central hole of the pipe ramming machine and cannot move up and down along the stator. The lower hexagonal guide rail sliding sleeve 11 is sleeved on the drilling guide rail 5 to limit the pipe ramming machine and the connected pipe ramming machine feeding cylinders, etc., so that the pipe ramming machine can only slide up and down.

[0054] The cylinder barrel of the pipe ramming machine unscrewing cylinder 13 is hinged and installed on the hexagonal guide rail sliding sleeve 11 and can also rotate around the hinge shaft.

[0055] The main functions of the pipe ramming machine 3 are to cooperate with the centering gripper 2 to unscrew the casing, pull out and feed the casing string. The casing string passes through the central holes of the pipe ramming machine 3 and the centering gripper 2 and is clamped and fixed by the clamping cylinders. The casing string is composed of multiple casings (i.e., special steel pipes) connected by threads. The centering gripper clamps the lower single casing through the clamping cylinder, and the pipe ramming machine clamps the upper single casing through the clamping cylinder.

[0056] When unscrewing the casing, the piston rod of the pipe ramming machine unscrewing cylinder 13 extends, driving the pipe ramming machine and the upper casing to slightly rotate a certain angle around the central hole of the pipe ramming machine, unlocking the tightest several threads in the threaded connection, and then the clamping cylinder 14 is loosened, and the casing is manually removed. The same principle applies when tightening.

[0057] Pulling out and feeding the casing is the process of the piston cylinder of the feeding cylinder 12 stretching and contracting. Generally, it only feeds and does not pull out. When feeding, the upper clamping cylinder clamps, the lower clamping cylinder loosens, the piston rod of the feeding cylinder 12 contracts to the bottom, and then the clamping cylinder of the pipe ramming machine loosens. The piston rod of the feeding cylinder extends to the predetermined position, and the clamping cylinder of the pipe ramming machine clamps. Repeating the above process realizes feeding.

[0058] The casing string is supported by the bottom of the hole. The pulling-out method is the same as that of the casing string.

[0059] The device described in the present invention is not connected to the drill pipe string. The drill pipe is inside the casing, concentric and not in contact. The drill pipe string extends beyond the casing string by a certain distance and is clamped by the power head.

[0060] Further, the power head of the power head assembly 4 is driven by a single motor and is internally equipped with a hydraulic clamping and hydraulic vibration impact device. The central hole of the power head passes through the drill pipe string. The hydraulic clamping device clamps the drill pipe string, the motor rotates, and the vibration impact device operates to provide torque, rotational speed, and impact work for the downhole drill tool through the drill pipe string.

[0061] On the outer shell of the power head support plate assembly 10, a hexagonal guide rail sliding sleeve 9 is welded (for the limiting function, so that the power head support plate assembly 10 can only slide up and down along the drill rig guide rail and cannot rotate or translate), and it cooperates with the drill rig guide rail 5 to play a role in limiting the power head assembly 4.

[0062] The power head support plate assembly 10 is hinged to the power head; the power head of the power head assembly 4 can rotate around the shaft on the support plate assembly 10 to facilitate the operation at the opening position.

[0063] The power head support plate assembly 10 is fixedly connected to the feed cylinder 8 by screws, and the feed cylinder 8 drives the power head support plate assembly 10 to slide up and down along the drill rig guide rail 5.

[0064] Furthermore, the drill rig guide rail 5 is the sliding base for the power head assembly 4 and the pipe ramming machine 3, and supports other key components of the drill rig.

[0065] The drill rig guide rail 5 is hinged to the chassis assembly 1 through a connecting shaft 19; the feed cylinder hinge seat holding block 17 and the hinge shaft support plate 18 are both installed on the centering chuck connecting plate 16; the feed cylinder hinge seat holding block 17 is located between the fixing plate 21 and the hinge shaft support plate 18.

[0066] One end of the connecting shaft 19 sequentially passes through the feed cylinder hinge seat holding block 17 and the hinge shaft support plate 18 and is welded to the guide rail welding pad 20; the other end is movably connected to the chassis assembly 1.

[0067] The fixing plate 21, the guide rail welding pad 20 and the drill rig guide rail 5 are fixedly connected by screws to form a rigid whole.

[0068] The drill rig guide rail 5 is fixed by the support cylinder 7 to support the main structure of the drill rig.

[0069] Embodiment

[0070] Now, taking the application of the present invention in a certain core drilling construction as an example, the present invention will be described in detail. It also has guiding significance for the application of the present invention in the drilling of other loose and broken formations.

[0071] In this embodiment, the core drilling construction is carried out by the pipe - following drilling method, and the specific method is as follows:

[0072] (1) Main construction equipment. One all-hydraulic power head drill suitable for drilling in loose and broken formations, one set of power units, one set of mud mixing and purification equipment, two sets of core drilling tools, several casings and drill pipes of corresponding sizes selected according to the designed borehole structure, and several guide centralizers.

[0073] (2) Install the drill. The drill of the present invention should be installed firmly and solidly. To prevent the drill of the present invention from shaking back and forth and left and right, anchor bolts should be embedded according to the anchor bolt holes at the drill base, so as to form an integral body among the ground, the machine platform wood and the drill, and use a spirit level to make the front and back of the drill on the same horizontal plane. According to the pre-designed opening angle, adjust the elongation of the support cylinder 7 until the inclination angle of the axis of the drill guide rail 5 reaches the predetermined target.

[0074] (3) Core-taking process. Select appropriate drilling procedure parameters and mud parameters, and the specific core-taking method is as follows.

[0075] 1) Before lowering the drill, assemble and debug each assembly as required to meet the requirements for lowering the drill. The drill tool is connected to the casing through the pipe shoe, the drill pipe string and the casing string are concentrically nested, the casing is centered with the axis of the pipe-rubbing machine 3 through the centering gripper 2, and the upper end of the drill pipe string is threadedly connected to the power head assembly 4.

[0076] 2) Lift the drill, start the power unit, and the mud starts to circulate. The power head assembly 4 rotates, the hydraulic vibration impactor works, the eccentric bit is driven by the drill pipe string to break rock and drill, the feed cylinder retracts, and the power head assembly 4 slides down along the drill guide rail 5. At the same time, the centering gripper 2 clamps the casing, and the feed cylinder 12 of the pipe-rubbing machine contracts synchronously, driving the casing string to extend downward.

[0077] 3) Add a single joint. The drill pipe is longer than the casing at the end close to the ground. Clamp the drill pipe with tools, the power head assembly 4 reversely unscrews the coupling and rises back to the upper part. Align the concentric nesting parts of the drill pipe and the casing with the drill pipe and the casing in the hole, the centering gripper 2 clamps the casing in the hole, the pipe-rubbing machine 3 clamps the newly added casing, the screw-on and unscrew cylinder 13 of the pipe-rubbing machine rotates, and tightens the casing; the output shaft of the power head aligns with the upper thread joint of the newly added drill pipe, and then directly rotates to tighten the drill pipe. Continue the drilling operation.

[0078] 4) At the end of a round trip, the core fills the core barrel, the power head assembly 4 reversely rotates a certain angle, the eccentric bit retracts into the casing, and lift the drill.

[0079] At this time, the casing string and the drill pipe string are separated, the casing string is left in the hole to play a role in protecting the wall, and the drill pipe string is directly lifted out of the ground surface to complete the core-taking operation.

[0080] Other parts not described are all prior arts.

Claims

1. A fully hydraulic power head drill suitable for drilling in loose and broken strata, characterized in that: It includes a chassis assembly (1), a centering gripper (2), a pipe ramming machine (3), a power head assembly (4), a drilling rig guide rail (5), a fixed pulley block (6), a support oil cylinder (7) and a feed oil cylinder (8); The power head of the power head assembly (4) is fixedly connected to the feed oil cylinder (8) and is slidably connected to the drilling rig guide rail (5); The drilling rig guide rail (5) is connected to the support oil cylinder (7); The drilling rig guide rail (5) is installed on the chassis assembly (1); The fixed pulley block (6) is fixed to the top of the drilling rig guide rail (5); Both the support oil cylinder (7) and the feed oil cylinder (8) are hinged and fixed to the chassis assembly (1); A clamping oil cylinder (14) is arranged inside the centering gripper (2); The centering gripper (2) is fixed to the centering gripper connecting plate (16) by screws; A clamping oil cylinder (14) is arranged inside the pipe ramming machine (3); Three oil cylinders are hinged to the outside of the pipe ramming machine (3). One of them is the pipe ramming machine unscrewing oil cylinder (13) connected to the clamping oil cylinder (14) of the pipe ramming machine (3), and the other two are both pipe ramming machine feed oil cylinders (12). The two pipe ramming machine feed oil cylinders (12) are respectively fixed to the centering gripper (2) and the pipe ramming machine feed oil cylinder hinge support (15); A lower hexagonal guide rail sliding sleeve (11) is welded on the shell of the pipe ramming machine (3); The drill string is inside the casing, concentric and not in contact. The drill string extends beyond the casing string by a certain distance and is clamped by the power head; The power head of the power head assembly (4) is driven by a single motor and is internally equipped with a hydraulic clamping and hydraulic vibration impact device. The center hole of the power head passes through the drill string. The hydraulic clamping device clamps the drill string, the motor rotates, and the vibration impact device works to provide torque, rotational speed and impact work for the downhole drill tool through the drill string; The pipe ramming machine is driven by a separate hydraulic source and is independently controlled with strong capabilities. It can directly pull out or press in the casing string without relying on the driving action of the downhole drill tool, and can also unscrew the casing, greatly improving the working efficiency of pipe following drilling; Pulling out and feeding the casing is the piston cylinder telescoping process of the pipe ramming machine feed oil cylinder (12). During feeding, the clamping oil cylinder of the pipe ramming machine (3) clamps, the clamping oil cylinder of the centering gripper (2) loosens, the piston rod of the pipe ramming machine feed oil cylinder (12) retracts to the end, then the clamping oil cylinder of the pipe ramming machine loosens, the piston rod of the feed oil cylinder extends to the predetermined position, and the clamping oil cylinder of the pipe ramming machine clamps. Repeating the above process realizes feeding; Before drilling, the drill tool is connected to the casing through the pipe shoe. The drill string and the casing string are concentrically nested, and the upper end of the drill string is threadedly connected to the power head assembly (4); When pulling out the drill, the power head assembly (4) rotates, drives the eccentric bit to break rock and drill through the drill string, the feed oil cylinder (8) retracts, and the power head assembly (4) slides down along the drilling rig guide rail (5); At the same time, the clamping oil cylinder of the pipe ramming machine (3) clamps the casing, and the pipe ramming machine feed oil cylinder (12) contracts synchronously, driving the casing string to extend downward; When adding a single joint of drill pipe, the drill pipe is longer than the casing at the end closer to the ground. Clamp the drill pipe with a tool. The power head assembly (4) rotates in reverse to release the connection, and then rises back upwards. Align the concentric sleeve for the drill pipe and the casing with the drill pipe and the casing in the hole. The centering gripper (2) clamps the casing in the hole, and the pipe ramming machine (3) clamps the newly added casing. The rotation cylinder (13) of the pipe ramming machine rotates to tighten the casing. Align the output shaft of the power head with the upper threaded joint of the newly added drill pipe, and then directly rotate to tighten the drill pipe. Continue with the drilling operation; At the end of a drilling cycle, when the core fills the core barrel, the power head assembly (4) rotates in reverse by a certain angle, and the eccentric bit retracts into the casing, then the drill string is lifted; At this time, the casing string is separated from the drill pipe string. The casing string is left in the hole to serve as a hole protection wall, while the drill pipe string is directly lifted out of the ground surface to complete the coring operation.

2. The all-hydraulic power head drill applicable to drilling in loose and broken strata according to claim 1, characterized in that: The power head assembly (4) consists of a power head, a hexagonal guide rail sliding sleeve (9), and a power head support plate assembly (10); Inside the power head of the power head assembly (4), a hydraulic clamping and hydraulic vibration impact device is installed; The hexagonal guide rail sliding sleeve (9) is welded to the outer shell of the power head support plate assembly (10); The power head support plate assembly (10) is hinged to the power head; The power head support plate assembly (10) is fixedly connected to the feed cylinder (8) by screws; 3. The all-hydraulic power head drill applicable to drilling in loose and broken strata according to claim 2, wherein: The drill rig guide rail (5) is hinged to the chassis assembly (1) through a connecting shaft (19), and the connecting shaft (19) is welded to the guide rail welding pad (20); The fixing plate (21), the guide rail welding pad (20), and the drill rig guide rail (5) are fixedly connected by screws.

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