Portable drill rod assembled rotation-impact ultrasonic drilling tool system

Abstract

The invention discloses a portable drill rod assembled rotary-impact ultrasonic drilling tool system, which belongs to the technical field of high-altitude mountain glacier drilling equipment and comprises a T-shaped grip, at least one assembled drill rod and a rotary power module which are sequentially and detachably connected from top to bottom. The ice core sampling drill bit or the combined impact power module and the rock core sampling drill bit are selected according to a drilling object; a cable bundle is arranged in the T-shaped grip, the assembled drill rod, the rotary power module and the impact power module in a penetrating manner, and the cable bundle comprises a motor driving cable and a piezoelectric driving cable which are respectively used for supplying power to a motor in the rotary power module and transmitting signals to a piezoelectric transducer in the impact power module; the system is powered by an outdoor mobile power supply and is controlled by a controller. The novel drilling system can adapt to the extreme environment of high-altitude mountain glacier, has efficient and low-consumption drilling capacity, and can realize continuous transmission of underground power and signals.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of high-altitude mountain glacier drilling equipment, in particular to a light drill pipe assembly type rotary-impact ultrasonic drilling system. BACKGROUND

[0002] Drilling through the ice layer and ice-rock interface to obtain the bedrock sample under the ice has important scientific value for understanding the formation and evolution of the landscape, revealing the interaction mechanism of glacier-bedrock, reconstructing the paleoclimate environment, and analyzing the characteristics of glacier dynamics.

[0003] However, the conventional drilling and sampling equipment has many limitations in the high-altitude mountain glacier environment. Conventional drilling tools are often difficult to perform such tasks due to adverse natural conditions, difficulties in transporting materials, inconvenience in energy supply, short effective operation time, low efficiency of high-altitude human operation, and strict environmental protection requirements. The commonly used drilling and sampling devices generally have poor environmental adaptability, large overall weight, high power consumption, slow drilling speed, large required drilling pressure, and dependence on drilling fluid for auxiliary chip removal, which cannot meet the actual needs of high-altitude glacier drilling.

[0004] In recent years, rotary-impact ultrasonic drilling technology based on piezoelectric driving principle has gradually attracted attention. Such drilling tools have a wide temperature resistance range, compact structure, light weight, low power consumption, small required drilling pressure, no need for drilling fluid, and easy operation, and are particularly suitable for bedrock coring operations in extreme environments such as high mountain glaciers. However, there is still room for improvement in the existing technology in actual application.

[0005] The commonly used assembly type drill pipe still has deficiencies in structural design. In particular, when performing downhole power driving and control, the conventional drill pipe does not integrate a cable for power supply and signal transmission, resulting in the inability to continuously power the downhole power device and reliably transmit signals during the process of adding drill pipes section by section, which severely restricts the ability of deep sampling and real-time data acquisition.

[0006] Therefore, there is an urgent need to develop a new drilling system that can adapt to the extreme environment of high-altitude mountain glaciers, has efficient and low-consumption drilling capability, and can realize continuous transmission of downhole power and signals. SUMMARY

[0007] The present application aims to provide a light drill pipe assembly type rotary-impact ultrasonic drilling system suitable for high-altitude mountain glacier environments to overcome the deficiencies of the prior art.

[0008] To achieve the above-mentioned purpose, the present application adopts the following technical solution: a light drill pipe assembly type rotary-impact ultrasonic drilling system, comprising, from top to bottom, sequentially detachably connected: T-shaped handle, at least one set of drill pipe, rotary power module, and according to the drilling object selection of ice core sampling drill bit or combined impact power module and core sampling drill bit; The T-shaped handle, the set of drill pipe, the rotary power module and the impact power module are internally provided with a cable bundle, the cable bundle includes motor driving cables and piezoelectric driving cables, and is respectively used for power supply and signal transmission for a motor in the rotary power module and a piezoelectric transducer in the impact power module. The system is powered by an outdoor mobile power supply and is controlled by a controller.

[0009] Further, the set of drill pipe includes a drill pipe base body, a drill pipe socket and a drill pipe plug plastic piece arranged at two ends of the drill pipe base body; the drill pipe socket is internally provided with a drill pipe socket contact pin, the drill pipe plug plastic piece is internally provided with a drill pipe plug contact pin, and the motor driving cables and the piezoelectric driving cables are connected to the drill pipe socket contact pin at one end and connected to the drill pipe plug contact pin at the other end.

[0010] Further, the lower end of the T-shaped handle is provided with a handle plug rotating fixing ring and a handle plug contact pin; the handle plug rotating fixing ring is threadedly connected with the drill pipe socket of the uppermost set of drill pipe, and the handle plug contact pin is in plug-in conduction with the drill pipe socket contact pin.

[0011] Further, a plurality of the set of drill pipes are connected through the following modes: The drill pipe plug contact pin at the lower end of the upper set of drill pipe is in plug-in conduction with the drill pipe socket contact pin at the upper end of the lower set of drill pipe; The drill pipe plug rotating fixing ring at the lower end of the upper set of drill pipe is threadedly connected with the drill pipe socket at the upper end of the lower set of drill pipe.

[0012] Further, the lower end of the lowermost set of drill pipe is threadedly connected with the joint socket at the top of the rotary power module through the drill pipe plug rotating fixing ring, and the drill pipe plug contact pin is in plug-in conduction with the joint socket contact pin.

[0013] Further, the bottom of the rotary power module is provided with a rotary connecting disc, the side wall of the rotary connecting disc is circumferentially uniformly provided with at least three mounting holes, each mounting hole is provided with a second spring and a fixed pin shaft, and a quick connecting mechanism is formed; The top side wall of the ice core sampling drill bit and the impact power module is provided with a pin hole corresponding to the fixed pin shaft, the fixed pin shaft is released after being pressed into and aligned with the pin hole, the fixed pin shaft is ejected and inserted into the pin hole under the elastic force of the second spring, the quick connection and locking of the rotary power module and the ice core sampling drill bit and the impact power module are realized.

[0014] Further, the impact power module comprises a piezoelectric transducer, a free mass, an impact power slider and a first spring; The first spring is arranged between the rotary connecting disc and the rear cover of the piezoelectric transducer, and is used for providing a pre-tightening force. The high-frequency vibration generated by the piezoelectric transducer is amplified by the free mass and then transmitted to the impact power slider, so as to drive the core sampling drill bit to realize high-frequency impact.

[0015] Further, the rotary power module is internally provided with an electrical slip ring; the piezoelectric driving cable in the cable bundle is connected to the piezoelectric transducer in the impact power module through the stator of the electrical slip ring and the rotor thereof.

[0016] Further, the core sampling drill bit comprises a drill bit base body, an inclined wedge type core breaking device, a cutter head assembly, a rock debris chamber and a core chamber, a spiral groove is arranged on the outer wall of the drill bit base body; the rock debris chamber is used for storing the rock debris returned by the spiral groove of the drill bit base body during drilling; the core chamber is used for storing the core after a single drilling cycle is completed; the inclined wedge type core breaking device is threadedly connected to the inner recessed step of the drill bit base body, and comprises a bearing seat, a bearing frame, a first thrust ball bearing, a special-shaped bolt, an inclined wedge, a felt ring, a special-shaped nut and a second thrust ball bearing; the bearing seat is connected to the upper part of the core chamber through threads; the bearing frame is connected to the bearing seat through screws; the lower end surface of the special-shaped bolt is matched with the upper end surface of the first thrust ball bearing; the lower end surface of the first thrust ball bearing is matched with the bearing frame; the upper end surface of the second thrust ball bearing is matched with the bearing frame; the lower end surface of the second thrust ball bearing is matched with the inclined wedge; the special-shaped nut fixes the inclined wedge on the special-shaped bolt through threads; the felt ring is fixed in the reserved groove on the inclined wedge; the cutter head assembly is fixed on the side wall of the drill bit base body through screws; the cutter head assembly comprises an openable core claw for supporting the core after the core is broken by the inclined wedge.

[0017] Further, the system has two working modes: The rotary drilling mode is used for drilling in ice layers or granular snow layers, and the bottom of the rotary power module is directly connected to the ice core sampling drill bit at this time; The rotary-impact drilling mode is used for drilling in the bedrock under the ice, and the bottom of the rotary power module is sequentially connected to the impact power module and the core sampling drill bit at this time.

[0018] Through the above design scheme, the portable drill rod group joint type rotary-impact ultrasonic drill system provided by the present application has the technical advantages of light weight, low drilling pressure requirement, strong high and low temperature resistance, low power consumption, high drilling efficiency and no need for drilling fluid, and has outstanding environmental adaptability, and is particularly suitable for drilling and sampling operations in extreme working conditions such as high-altitude mountain glaciers.

[0019] The system takes a motor as a rotary power source and a piezoelectric transducer as an impact power source, and can flexibly switch between a pure rotary drilling mode and a rotary-impact combined drilling mode according to stratum conditions, so as to significantly improve drilling adaptability and operation efficiency.

[0020] In terms of the drill pipe structure, the application breaks through the traditional threaded connection mode, adopts a group joint type drill pipe design, integrates a drill pipe plug rotary fixing ring, and adopts a threaded locking type connection structure. Each group joint type drill pipe is internally provided with a driving cable, effectively overcoming the technical bottleneck that the cable is difficult to be synchronously lowered during the process of adding a drill pipe.

[0021] The system further adopts a modular architecture, supports rapid disassembly and maintenance in harsh environments such as high-altitude mountains and glaciers.

[0022] The impact power module is passively rotated with the whole drilling tool, the high-frequency axial impact generated inside is independent of the rotary motion provided by the drilling tool, and can be controlled respectively. The first spring is used to apply a pre-tightening force to the piezoelectric transducer, the free mass block and the core sampling drill bit, so as to ensure that the three are in the best matching state. Tests show that there is a clear optimal interval between the pre-tightening force and the drilling speed, and the use of the first spring pre-tightening structure can make the impact performance optimal. In addition, by replacing springs with different stiffness, the pre-tightening force can be flexibly adjusted, so as to continuously optimize the adaptability and drilling efficiency of the system to different strata. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 FIG. 1 is a structure schematic diagram of a rotary-impact ultrasonic drilling tool system for ice (granular snow) layers in an embodiment of the application; Figure 2 FIG. 2 is a structure schematic diagram of a rotary-impact ultrasonic drilling tool system for bedrock under ice in an embodiment of the application; Figure 3 FIG. 3 is a cross-sectional view of a T-shaped handle and a group joint type drill pipe after assembly; Figure 4 FIG. 4 is a cross-sectional view of a light-weight drill pipe group joint type rotary-impact ultrasonic drilling tool system; Figure 5 FIG. 5 is a cross-sectional view of a rotary power module; Figure 6 FIG. 6 is a cross-sectional view of an impact power module; Figure 7 FIG. 7 is a cross-sectional view of a core sampling drill bit; Figure 8 FIG. 8 is a cross-sectional view of a group joint type drill pipe; Figure 9 FIG. 9 is a cross-sectional view of a T-shaped handle; Figure: 1-T-shaped handle; 2-Sectional drill pipe; 3-rotary power module; 4-impact power module; 5-core sampling drill bit; 6-ice core sampling drill bit; 7-outdoor mobile power supply; 8-controller; 9-handle; 10-cable bundle; 11-handle plug plastic part; 12-handle plug rotary fixing ring; 13-drill pipe plug pin insulation seat; 14-drill pipe base body; 15-motor drive cable; 16-piezoelectric drive cable; 17-drill pipe plug plastic part; 18-drill pipe plug rotary fixing ring; 19-joint plug pin insulation seat; 20-joint; 21-housing A; 22-motor; 23-reducer; 24-coupling; 25-housing B; 26-angular contact ball bearing; 27-electric slip ring; 28-deep groove ball bearing; 29-seal; 30-rotary connecting disc; 31-second spring; 32-fixing pin shaft; 33-thrust pin; 34-first spring; 35-piezoelectric transducer rear cover; 36-piezoelectric transducer housing; 37-protection housing; 38-piezoelectric transducer; 39-impact power slider; 40-free mass; 41-drill bit base body; 42-inclined wedge type core breaker; 43-tool head assembly; 44-bearing seat; 45-bearing frame; 46-first thrust ball bearing; 47-odd-shaped bolt; 48-inclined wedge; 49-felt ring; 50-odd-shaped nut; 51-cuttings chamber; 52-core chamber; 53-rotary shaft; 54-second thrust ball bearing; 55-handle plug contact pin; 56-drill pipe socket contact pin; 57-drill pipe socket nut; 58-drill pipe socket; 59-drill pipe plug contact pin; 60-joint nut; 61-joint socket contact pin; 62-joint socket. DETAILED DESCRIPTION

[0024] In order to make the objects, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below in conjunction with the drawings and specific embodiments. Those skilled in the art should understand that the specific description below is illustrative rather than limiting, and should not limit the protection scope of the present application. Unless otherwise defined, the technical terms or scientific terms used herein should be understood as the usual meaning understood by those skilled in the art in the field of the present application. In order to avoid obscuring the essence of the present application, well-known methods, processes, procedures, elements and circuits are not described in detail.

[0025] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9As shown, this invention proposes a lightweight drill pipe assembly-type rotary-impact ultrasonic drilling tool system, which adopts a modular design and includes nine modules: a T-handle 1, an assembly-type drill pipe 2, a rotary power module 3, an impact power module 4, a core sampling drill bit 5, an ice core sampling drill bit 6, an outdoor portable power supply 7, a controller 8, and a cable bundle 10. The system is powered by the outdoor portable power supply 7 and controlled by the controller 8.

[0026] The T-shaped grip 1 consists of a handle 9, a grip plug contact pin 55, a grip plug plastic part 11, and a grip plug rotating retaining ring 12. The handle 9 is formed by welding two round tubes into a T-shape, with a through hole in the middle for threading the cable bundle 10. The grip plug plastic part 11 is cylindrical, with four circular through holes machined along its axial direction for inserting the grip plug contact pin 55. The side wall of the grip plug plastic part 11 has an axial semi-circular keyway as a guide structure to prevent mis-insertion and damage to the equipment. The grip plug rotating retaining ring 12 is a hollow cylinder with internal threads machined on its inner wall for screwing into the drill rod socket 58. The outer wall of the grip plug rotating retaining ring 12 has anti-slip textures to increase friction during manual unscrewing. The plastic part 11 of the grip plug is integrally connected to the inner wall below the handle 9 by epoxy resin adhesive. The rotating retaining ring 12 of the grip plug is placed on the handle 9 and can move along the axial direction of the handle 9. After the plastic part 11 of the grip plug and the drill pipe socket 58 are inserted together, the rotating retaining ring 12 of the grip plug is used to screw them together and fix them, thereby realizing the connection of the cable. The rotating retaining ring 12 of the grip plug connects the T-shaped grip 1 to the modular drill pipe 2, which can overcome the torque generated during drilling. The grip plug contact pin 55 is a copper tubular structure used to insert into the drill pipe socket contact pin 56. The grip plug contact pin 55 has an "I"-shaped notch at its lower end and is fixed to the plastic part 11 of the grip plug by epoxy resin adhesive. The core function of the T-shaped grip 1 is to provide a grip for the operator during drilling operations to resist the counter-torque generated when drilling into ice or rock. Electrical energy and signals are introduced into the handle 9 via the cable bundle 10, and then conducted to the handle plug contact pin 55. Finally, the transmission of electricity and signals is achieved through the contact between the handle plug contact pin 55 and the drill pipe socket contact pin 56.

[0027] The T-shaped handle 1 is connected with the drill pipe socket 58 on the assembled drill pipe 2 through the inner thread on the handle plug rotary fixing ring 12, and the lower part of the assembled drill pipe 2 is connected with the joint socket 62 of the rotary power module 3 or the drill pipe socket 58 on another assembled drill pipe 2 through the inner thread on the drill pipe plug rotary fixing ring 18. The drill pipe socket 58 is a tubular structure, and the outer wall thereof is threaded at the upper end for connection with the drill pipe plug rotary fixing ring 18 or the handle plug rotary fixing ring 12; a flange structure is arranged in the middle to limit the screwing depth. The drill pipe plug rotary fixing ring 18 is a cylindrical structure, and the inner wall thereof is threaded to be connected with the thread on the drill pipe socket 58; the outer wall of the drill pipe plug rotary fixing ring 18 is processed with anti-skid lines to increase the friction force when manually screwing. The joint socket 62 is consistent with the drill pipe socket 58 in structure.

[0028] When drilling into the ice layer in the rotary mode, the rotary power module 3 is connected with the ice core sampling drill bit 6 through the fixing pin shaft 32. When drilling into the bedrock under the ice in the rotary-impact mode, the rotary power module 3 is connected with the impact power module 4 through the fixing pin shaft 32, and the impact power module 4 is connected with the drill bit base 41 through the outer thread of the impact power slider 39 and the inner thread of the drill bit base 41, and the impact power slider 39 can move axially along the protective shell 37. The cable bundle 10 passes through the T-shaped handle 1, the assembled drill pipe 2, the rotary power module 3 and the impact power module 4 in sequence.

[0029] Among them, the current and signal transmitted by the cable are connected between the T-shaped handle 1 and the assembled drill pipe 2 through the handle plug contact pin 55 and the drill pipe socket contact pin 56, connected between different assembled drill pipes 2 through the drill pipe plug contact pin 59 and the drill pipe socket contact pin 56, and connected between the assembled drill pipe 2 and the rotary power module 3 through the drill pipe plug contact pin 59 and the joint socket contact pin 61.

[0030] The cable bundle 10 includes a motor driving cable 15 and a piezoelectric driving cable 16. The motor driving cable 15 passes through the T-shaped handle 1, and the current or signal transmitted by the motor driving cable 15 is transmitted into the cable in the assembled drill pipe 2 through the handle plug contact pin 55 and the drill pipe socket contact pin 56, and then transmitted into the rotary power module 3 through the drill pipe plug contact pin 59 and the joint socket contact pin 61 to be connected with the motor 22, so as to realize power supply and signal transmission of the motor 22. The piezoelectric driving cable 16 passes through the T-shaped handle 1, and the high-frequency alternating current transmitted by the piezoelectric driving cable 16 is transmitted into the cable in the assembled drill pipe 2 through the handle plug contact pin 55 and the drill pipe socket contact pin 56, and then transmitted into the cable in the rotary power module 3 through the drill pipe plug contact pin 59 and the joint socket contact pin 61, and then connected to the electrical slip ring 27 in the rotary power module 3, and then connected to the piezoelectric transducer 38 in the impact power module 4 through the electrical slip ring 27 outlet, so as to realize power supply and driving of the piezoelectric transducer 38.

[0031] The piezoelectric transducer 38 is composed of a cylinder, a stacked piezoelectric ceramic and a variable cross-section cylinder from top to bottom. The high frequency vibration generated by the stacked piezoelectric ceramic is amplified in amplitude by the variable cross-section cylinder and then transmitted to the free mass 40.

[0032] The assembled drill rod 2 comprises a drill rod socket nut 57, a drill rod socket 58, a drill rod socket contact pin 56, a drill rod contact pin insulating seat 13, a drill rod base 14, a motor driving cable 15, a piezoelectric driving cable 16, a drill rod plug plastic part 17, a drill rod plug rotating fixing ring 18 and a drill rod plug contact pin 59. The drill rod socket nut 57 is screwed on the drill rod socket 58, the drill rod socket 58 is screwed on the drill rod base 14, the drill rod socket contact pin 56 is bonded on the drill rod contact pin insulating seat 13 by epoxy resin adhesive, the drill rod contact pin insulating seat 13 is bonded on the drill rod socket 58 by epoxy resin adhesive, the motor driving cable 15 and the piezoelectric driving cable 16 are connected on the drill rod socket contact pin 56 at one end and connected on the drill rod plug contact pin 59 at the other end. The drill rod plug rotating fixing ring 18 has threads on the inner wall and can move axially along the drill rod base 14, the drill rod plug contact pin 59 is fixed on the drill rod plug plastic part 17 by epoxy resin adhesive, and the drill rod plug plastic part 17 is fixed on the lower end of the drill rod base 14 by epoxy resin adhesive. The upper part of the assembled drill rod 2 is connected with the lower part of the T-shaped handle 1 or the lower part of another assembled drill rod 2, and the lower part of the assembled drill rod 2 is connected with the joint 20 of the rotary power module 3 or the upper part of another assembled drill rod 2. During drilling, the assembled drill rod 2 is added successively to realize drilling at a greater depth.

[0033] The rotary power module 3 includes a joint socket contact pin 61, a joint socket 62, a joint nut 60, a joint pin insulation seat 19, a joint 20, a shell A 21, a motor 22, a reducer 23, a shaft coupling 24, a shell B 25, an angular contact ball bearing 26, a rotary shaft 53, an electrical slip ring 27, a deep groove ball bearing 28, a seal 29, a rotary connecting disc 30, a second spring 31, a fixed pin shaft 32 and a thrust pin 33. The joint socket contact pin 61 and the joint pin insulation seat 19 are bonded together by epoxy resin adhesive, and the joint pin insulation seat 19 is fixed together with the joint socket 62 by epoxy resin adhesive. The joint nut 60 is connected together with the joint socket 62 by threads, and the joint socket 62 is connected together with the joint 20 by its own threads. The joint 20 is connected together with the shell A 21 by bolts, the motor 22 is fixed to the shell A 21 by bolts, the rear end of the reducer 23 is positioned by a flat key and fixed to the motor 22 by bolts. One end of the shaft coupling 24 is positioned by a flat key and fixed to the front end of the reducer 23 by bolts, the other end of the shaft coupling 24 is positioned by a flat key and fixed to the rotary shaft 53 by bolts, the shell B 25 is connected to the lower part of the shell A 21 by threads, the rotary shaft 53 passes through the electrical slip ring 27, the stator of the electrical slip ring 27 is fixed on the shell B 25, the inner ring of the angular contact ball bearing 26 is fixed on the rotary shaft 53, and the outer ring is fixed on the shell B 25, the inner ring of the deep groove ball bearing 28 is fixed on the rotary connecting disc 30, and the outer ring is fixed on the shell B 25, the rotary connecting disc 30 is positioned by a flat key and fixed to the rotary shaft 53 by bolts. The rotary connecting disc 30 is provided with three circumferentially distributed holes, the holes have the second spring 31 and the fixed pin shaft 32, and the thrust pin 33 is fixed to the side of the fixed pin shaft 32 by threads.

[0034] When connecting the rotary power module 3 and the impact power module 4, first connect the cables between the rotary power module 3 and the impact power module 4. Use a screwdriver to push the fixed pin shaft 32 inward, push the second spring 31 to the limit position of the thrust pin 33, then align the hole on the upper side wall of the protective shell 37 of the impact power module 4 with the hole on the side wall of the rotary connecting disc 30 of the rotary power module 3, and the second spring 31 is pushed out, the fixed pin shaft 32 is pushed out, and the rotary power module 3 and the impact power module 4 are connected. When the rotary power module 3 is directly connected with the ice core sampling drill bit 6, this method is also used. When the impact power module 4 or the ice core sampling drill bit 6 needs to be removed, the same steps are performed.

[0035] The impact power module 4 includes a first spring 34, a piezoelectric transducer rear cover 35, a piezoelectric transducer shell 36, a protective shell 37, a piezoelectric transducer 38, an impact power slider 39 and a free mass 40. The first spring 34 is pressed at both ends of the rotary power module 3 and the piezoelectric transducer rear cover 35 of the impact power module 4, respectively, the piezoelectric transducer rear cover 35 is connected to the piezoelectric transducer shell 36 by screwing, the piezoelectric transducer 38 flange is connected to the piezoelectric transducer shell 36 by screwing, the impact power slider 39 is circumferentially fixed to the three guide columns of the protective shell 37, which can move forward and backward along the guide shaft. The free mass 40 is pressed between the piezoelectric transducer 38 and the impact power slider 39.

[0036] The core sampling drill bit 5 includes a drill bit base 41, a wedge type core breaker 42 and a cutter head assembly 43. The drill bit base 41 is a cylindrical structure, the outer surface of the drill bit base 41 is provided with a spiral groove, the upper end of the drill bit base 41 is provided with a threaded hole for connecting the impact power slider 39 above. The internal cavity of the drill bit base 41 is divided into a cutting debris chamber 51, an inner recess step and a core chamber 52 from top to bottom. At least three sets of threaded holes are provided on the side wall of the lower end of the drill bit base 41 for mounting and fixing the cutter head assembly 43. The wedge type core breaker 42 is connected to the inner recess step of the drill bit base 41 by screwing, which is used to separate the core during coring. When the cutting debris is discharged, the cutting debris is returned along the spiral groove on the drill bit base 41 until it falls into the cutting debris chamber 51 from the reserved hole. The cutting debris chamber 51 is used to store the cutting debris returned by the spiral groove during drilling, and the core chamber 52 is used to store the core after the single round drilling is completed. The wedge type core breaker 42 includes a bearing seat 44, a bearing frame 45, a first thrust ball bearing 46, a special-shaped bolt 47, a second thrust ball bearing 54, a wedge 48, a felt ring 49 and a special-shaped nut 50. The bearing seat 44 is connected to the upper part of the core chamber 52 by screwing, the bearing frame 45 is connected to the bearing seat 44 by screwing, the lower end surface of the special-shaped bolt 47 is matched with the upper end surface of the first thrust ball bearing 46, the lower end surface of the first thrust ball bearing 46 is matched with the bearing frame 45, the upper end surface of the second thrust ball bearing 54 is matched with the bearing frame 45, the lower end surface of the second thrust ball bearing 54 is matched with the wedge 48, the special-shaped nut 50 fixes the wedge 48 on the special-shaped bolt 47 by screwing, and the felt ring 49 is fixed in the groove reserved on the wedge 48. The wedge 48 is composed of a thin disc and a wedge body, the side wall of the thin disc is provided with a groove for mounting the outer ring of the felt ring 49.

[0037] Further, the drill rod pin insulation seat 13 is a cylindrical plastic part, which is provided with four circular through holes in the axial direction, and the drill rod socket contact pin 56 penetrates into the four circular through holes and is fixed by using epoxy resin adhesive.

[0038] The drill pipe base 14 is a stepped tube. The inner wall of the large diameter end is provided with a thread for connecting the drill pipe socket 58; the other end is provided with a flange to prevent the drill pipe plug rotating fixing ring 18 from falling off.

[0039] The drill pipe plug plastic part 17 is identical in structure to the handle plug plastic part 11, which is a cylindrical plastic part with four axial circular through holes and a semicircular guide key groove in the side wall, for correctly inserting the contact pin and preventing misinsertion.

[0040] The shell A21 is a hollow cylindrical sleeve structure with a flange, composed of a flange plate, a cylinder and an inner recessed connecting section. The one end is provided with a thickened circular flange plate, and the flange is uniformly distributed with six through holes, which are fastened and connected with the threaded holes on the side surface of the joint 20 through screws. The other end is an inner recessed connecting section, which is in the form of an inner recessed step, and a group of through holes are arranged on the step surface for screwing into screws to connect with the threaded holes on the end surface of the speed reducer 23, thereby fixing the speed reducer 23. The outer side of the end port is also processed with external threads for screwing connection with the internal thread section of the shell B25.

[0041] The shell B25 is a multi-stage cylindrical shell with three-stage inner cavity steps. The uppermost end has the largest inner cavity diameter for accommodating the coupling 24, and the port has internal threads for connection with the shell A21; the middle section is an annular step with a reduced inner diameter for cooperation with the outer ring of the angular contact ball bearing 26; the lowermost end inner cavity diameter is expanded again, and a ring-shaped groove is processed on the port for installing the felt ring outer ring 49.

[0042] The piezoelectric transducer rear cover 35 is composed of three sections from top to bottom. The uppermost end is a cylindrical section with at least one flat notch in the side wall to form a wrench socket for easy disassembly and assembly with tools. The middle part is a disc section, and the outer diameter of the disc section is larger than that of the cylindrical section. The lower end is a circular ring section. The diameter of the disc section is the same as the outer diameter of the circular ring section. The outer periphery of the disc section and the circular ring section is provided with external threads for screwing connection with the piezoelectric transducer shell 36.

[0043] The piezoelectric transducer shell 36 is in the form of a cylinder. The upper end is provided with internal threads for connection with the external threads of the piezoelectric transducer rear cover 35. The inner side of the lower end is provided with a ring-shaped recessed step, which is uniformly distributed with at least six threaded holes in the circumferential direction for connecting the piezoelectric transducer 38 flange and the piezoelectric transducer shell 36 through fasteners.

[0044] The protective shell 37 is a thin-walled hollow cylinder. The upper end side wall is uniformly provided with three circular holes in the circumferential direction. The fixing pin shaft 32 penetrates the circular holes and the holes on the rotary connecting disc 30 corresponding to the circular holes, connecting the protective shell 37 and the upper rotary connecting disc 30 together to realize power transmission. The lower end inner side of the protective shell 37 is provided with a circle of concave steps for axially limiting the core sampling drill bit 5. On the inner wall of the shell above the steps, at least three axially extending guide columns (or guide grooves) are arranged to cooperate with the corresponding structure on the core sampling drill bit 5, so as to ensure that the core sampling drill bit 5 can only move up and down in the protective shell 37 in the axial direction, and cannot rotate in the circumferential direction.

[0045] The drill rod socket contact pin 56 is a tubular structure, the upper end of which is a hollow semispherical shape and has a section of “I”-shaped notch, and the lower end is a semicircular shape with a notch.

[0046] The drill rod socket nut 57 is a hexagonal head nut, which is screwed on the drill rod socket 58 to facilitate the clamping and fixing of the open wrench when the drill rod is disassembled.

[0047] The drill rod socket 58 is a tubular part, the outer wall of which is provided with threads at the upper end for connecting with the drill rod plug rotary fixing ring 18 or the handle plug rotary fixing ring 12; the middle part is provided with a flange structure to limit the rotation depth.

[0048] The drill rod plug contact pin 59 is a copper tubular part for inserting into the drill rod socket contact pin 56 or the joint socket contact pin 61; the lower end is provided with an “I”-shaped notch, and is fixed on the drill rod plug plastic part 17 by epoxy resin adhesive.

[0049] The joint nut 60 is consistent in structure with the drill rod socket nut 57, and is screwed on the joint socket 62 to facilitate the tightening or loosening by means of the open wrench when the drill rod is disassembled.

[0050] The joint socket contact pin 61 is the same in structure as the drill rod socket contact pin 56.

[0051] The joint socket 62 is consistent in structure with the drill rod socket 58.

[0052] The electrical slip ring 27 adopts a standard commercial part.

[0053] The piezoelectric transducer 38 is used to provide impact power. The piezoelectric transducer 38 generates high-frequency vibration of tens of kHz, and after the energy concentration and amplification of the free mass block 40, the impact is transmitted to the drill bit. The free mass block 40 reciprocates between the piezoelectric transducer 38 and the drill bit at a frequency of 60 Hz to 1000 Hz, so that the drill bit impacts and breaks the rock with high-frequency micro-vibration, thereby realizing low drilling pressure and high drilling efficiency compared with pure rotary drilling and other impact drilling.

[0054] The piezoelectric transducer 38 is simple in structure and high in output density (for example, the maximum output force of a stacked piezoelectric transducer with a cross-sectional size of 10 mm*10 mm reaches 7 kN, and the output force density of an ultrasonic piezoelectric driver reaches 5-10 times of that of an electromagnetic motor). Moreover, high-frequency micro-vibration makes the drilling tool have a small demand for drilling pressure, and additional counterweights or a large drilling pressure artificially applied are not needed. Spiral cutting is adopted, and an air circulation system and a drilling fluid circulation system are not needed to assist in cutting. In summary, the drilling tool realizes lightweight and drilling without drilling fluid, and does not cause pollution to the environment.

[0055] The piezoelectric transducer 38 is based on the inverse piezoelectric effect and adopts a piezoelectric ceramic sheet as a core driving element. The ceramic sheet has a wide temperature resistance range (-140℃ to 386℃) and high power density characteristics, thereby significantly reducing the overall power consumption of the drilling tool and endowing it with excellent high and low temperature environment adaptability.

[0056] Working principle of the present application: The present application can realize rotary drilling and rotary-impact drilling processes, and can replace the drill bit according to different drilling processes, so as to realize drilling of granular snow layer, ice layer and sub-ice bedrock.

[0057] When drilling the granular snow layer or the ice layer, the rotary drilling process is used, and the ice core sampling drill bit 6 is directly connected below the rotary power module 3. The drilling personnel hold the T-shaped handle 1 with both hands to resist the torque generated in the drilling process, turn on the motor driving cable 15, make the rotary power module 3 work, and transmit the rotary power to the ice core sampling drill bit 6 through the rotary connecting disc 30, so as to realize rotary drilling of the granular snow layer or the ice layer. In the drilling process, the drilling personnel apply pressure downward to provide the drilling pressure in the drilling process, and the ice (snow) cuttings generated during drilling are returned through the spiral groove on the drill bit base 41 and then fall into the cutting chamber 51. After the drilling of this time is completed, the drilling tool is taken out, and the ice (snow) cuttings and the ice core (snow) are poured out.

[0058] When drilling into the subglacial bedrock, the rotary-impact drilling process is used, and the rotary power module 3 is connected to the core sampling drill bit 5 below. The driller also needs to hold the T-shaped handle 1 to resist the torque generated during drilling. The rotary power module 3 rotates the impact power module 4 and the core sampling drill bit 5, and the piezoelectric drive cable 16 is connected. According to the inverse piezoelectric effect of the piezoelectric ceramic, the piezoelectric transducer 38 in the impact power module 4 is excited by a high-frequency alternating current signal to produce high-frequency longitudinal vibration. After amplification by the free mass block 40, the impact power is transmitted to the impact power slider 39 of the impact power module 4, causing the impact power slider 39 to drive the drill bit base 41 to move circumferentially and reciprocally, thereby achieving the effect of rotary-impact drilling into the rock. During drilling, the driller applies pressure through the drill pipe to apply drilling pressure. The first spring 34 is compressed, and the compression force of the first spring 34 is the pressure applied to the drill tool, which is also the pre-tightening force between the piezoelectric transducer 38, the free mass block 40, and the core sampling drill bit 5. The compression process of the first spring 34 will continue until the upper end surface of the core sampling drill bit 5 is tightly attached to the protective shell 37. At this time, the first spring 34 reaches the maximum compression state, and the pre-tightening force between the piezoelectric transducer 38, the free mass block 40, and the core sampling drill bit 5 is no longer adjustable. Since the impact power module 4 has an optimal pre-tightening force, such a structure can achieve the purpose of controlling the pre-tightening force, allowing the impact power module 4 to perform at its best. If a greater pre-tightening force is required, a spring with greater stiffness should be used.

[0059] After the subglacial bedrock drilling is completed and the core chamber 52 is filled with samples, the wedge-type core breaker 42 breaks the core wedge, and the core claws on the cutter assembly 43 open to hold the broken core to prevent it from falling. The driller raises the drill tool to the ground, removes the core, and pours out the drillings. Depending on the drilling depth, the drill pipe 2 is connected to complete the core drilling work.

[0060] After the ice core sampling drill bit 6 is used to drill into the ice layer, the core sampling drill bit 5 needs to be replaced. The fixed pin shaft 32 is pushed inward to compress the second spring 31 to the limit position of the thrust pin 33, and the ice core sampling drill bit 6 is removed. The impact power module 4 and the core sampling drill bit 5 are installed, and after the hole above the impact power module 4 is aligned with the hole where the fixed pin shaft 32 is located, the second spring 31 is pulled out to fix the impact power module 4. If the impact power module 4 and the core sampling drill bit 5 are removed in the same way when drilling into the ice layer, the ice core sampling drill bit 6 is replaced.

[0061] In the process of rotary drilling or rotary-impact drilling, the drill bit base 41 relies on the helical groove on the outer surface to rotate the drill cuttings generated during drilling to the gap above the cutting chamber 51 of the core sampling drill bit 5 or the ice core sampling drill bit 6, and the drill cuttings fall into the cutting chamber 51, thereby achieving the function of storing drill cuttings during drilling. After the single drilling cycle is completed, the drill sampler is lifted to the ground, the drill cuttings are poured out, and the cutting effect is achieved, thereby reducing the influence of drill cuttings on drilling efficiency. At the same time, during the rotary-impact drilling of the sampler, the vibration of the piezoelectric transducer 38 transmitted to the drill bit through the free mass block 40 can also enhance the cutting effect, further improving the drilling efficiency.

Claims

1. A portable drill pipe makeup rotary-impact ultrasonic drill system, characterized by, It comprises T-shaped handle (1), at least one set of drill pipe (2), rotary power module (3), and ice core sampling drill bit (6) or combined impact power module (4) and core sampling drill bit (5) selected according to drilling object, which are connected in turn from top to bottom. The T-shaped handle (1), the set of drill pipe (2), the rotary power module (3) and the impact power module (4) are provided with cable bundles (10) inside and through them, the cable bundles (10) include motor driving cable (15) and piezoelectric driving cable (16), which are respectively used for power supply and signal transmission for the motor (22) in the rotary power module (3) and the piezoelectric transducer (38) in the impact power module (4). The system is powered by outdoor mobile power supply (7) and controlled by controller (8). The set of drill pipe (2) includes drill pipe base body (14), drill pipe socket (58) and drill pipe plug plastic part (17) arranged at both ends of the drill pipe base body (14); the drill pipe socket (58) is provided with drill pipe socket contact pin (56) inside, the drill pipe plug plastic part (17) is provided with drill pipe plug contact pin (59) inside, and the motor driving cable (15) and the piezoelectric driving cable (16) are connected to the drill pipe socket contact pin (56) at one end and connected to the drill pipe plug contact pin (59) at the other end.

2. The compact drill pipe make-up rotary-impact ultrasonic drill tool system of claim 1, wherein, The lower end of the T-shaped handle (1) is provided with handle plug rotating fixing ring (12) and handle plug contact pin (55); the handle plug rotating fixing ring (12) is threadedly connected with the drill pipe socket (58) of the uppermost set of drill pipe (2), and the handle plug contact pin (55) is inserted and connected with the drill pipe socket contact pin (56).

3. The compact drill pipe make-up rotary-impact ultrasonic drill tool system of claim 2, wherein, A plurality of the set of drill pipe (2) are connected by the following ways:

4. The portable drill pipe make-up rotary-impact ultrasonic drill system of claim 2, wherein, The drill pipe plug contact pin (59) at the lower end of the upper set of drill pipe (2) is inserted and connected with the drill pipe socket contact pin (56) at the upper end of the lower set of drill pipe (2); The drill pipe plug rotating fixing ring (18) at the lower end of the upper set of drill pipe (2) is threadedly connected with the drill pipe socket (58) at the upper end of the lower set of drill pipe (2). The lower end of the lowermost set of drill pipe (2) is threadedly connected with the joint socket (62) at the top of the rotary power module (3) through the drill pipe plug rotating fixing ring (18), and the drill pipe plug contact pin (59) is inserted and connected with the joint socket contact pin (61).

5. The compact drill pipe make-up rotary-impact ultrasonic drill tool system of claim 2, wherein, The bottom of the rotary power module (3) is provided with rotary connecting disc (30), the side wall of the rotary connecting disc (30) is circumferentially provided with at least three mounting holes, each mounting hole is provided with second spring (31) and fixed pin shaft (32), and a quick connecting mechanism is formed; the top side wall of the ice core sampling drill bit (6) and the impact power module (4) is provided with pin hole corresponding to the fixed pin shaft (32), the fixed pin shaft (32) is pressed into and aligned with the pin hole, then released, the fixed pin shaft (32) is ejected and inserted into the pin hole under the elastic force of the second spring (31), and the quick connection and locking of the rotary power module (3) with the ice core sampling drill bit (6) and the impact power module (4) are realized.

6. The compact drill pipe make-up rotary-impact ultrasonic drill tool system of claim 1, wherein, ​ 7. The compact drill pipe make-up rotary-impact ultrasonic drill tool system of claim 6, wherein, The impact power module (4) comprises a piezoelectric transducer (38), a free mass (40), an impact power slider (39) and a first spring (34); The first spring (34) is arranged between the rotary connecting disc (30) and the piezoelectric transducer rear cover (35) to provide a pre-tightening force; The high-frequency vibration generated by the piezoelectric transducer (38) is amplified by the free mass (40) and then transmitted to the impact power slider (39) to drive the core sampling drill bit (5) to realize high-frequency impact.

8. The compact drill pipe make-up rotary-impact ultrasonic drill tool system of claim 1, wherein, The rotary power module (3) is internally provided with an electrical slip ring (27); the piezoelectric drive cable (16) in the cable bundle (10) is connected to the piezoelectric transducer (38) in the impact power module (4) through the stator of the electrical slip ring (27) and the rotor thereof, thereby realizing continuous power supply in the rotary state.

9. The compact drill pipe make-up rotary-impact ultrasonic drill tool system of claim 1, wherein, The core sampling drill bit (5) comprises a drill bit base body (41), a wedge-type core breaking device (42), a cutter head assembly (43), a debris chamber (51) and a core chamber (52), the outer wall of the drill bit base body (41) is provided with a spiral groove; the debris chamber (51) is used to store the debris returned by the spiral groove of the drill bit base body (41) during drilling; the core chamber (52) is used to store the core after a single round of drilling is completed; the wedge-type core breaking device (42) is threadedly connected to the inner recessed step of the drill bit base body (41), and comprises a bearing seat (44), a bearing frame (45), a first thrust ball bearing (46), a special-shaped bolt (47), a wedge (48), a felt ring (49), a special-shaped nut (50) and a second thrust ball bearing (54); the bearing seat (44) is connected to the upper part of the core chamber (52) by threads; the bearing frame (45) is connected to the bearing seat (44) by screws; the lower end surface of the special-shaped bolt (47) is matched with the upper end surface of the first thrust ball bearing (46); the lower end surface of the first thrust ball bearing (46) is matched with the bearing frame (45); the upper end surface of the second thrust ball bearing (54) is matched with the bearing frame (45), and the lower end surface of the second thrust ball bearing (54) is matched with the wedge (48); the special-shaped nut (50) fixes the wedge (48) to the special-shaped bolt (47) by threads; the felt ring (49) is fixed in the reserved groove on the wedge (48); the cutter head assembly (43) is fixed to the side wall of the drill bit base body (41) by screws; the cutter head assembly (43) comprises expandable core claws for supporting the core after the core is broken by the wedge.

10. The compact drill pipe make-up rotary-impact ultrasonic drill tool system of claim 1, wherein, The system has two working modes: Rotary drilling mode: used for drilling in ice layer or granular snow layer, at this time the bottom of the rotary power module (3) is directly connected to the ice core sampling drill bit (6); Rotary-impact drilling mode: used for drilling in underlying bedrock, at this time the bottom of the rotary power module (3) is sequentially connected to the impact power module (4) and the core sampling drill bit (5).

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