Impact hole forming device for rock-socketed foundation pile anchor rod

Abstract

The invention relates to the field of hole forming processes, and discloses a rock-socketed foundation pile anchor rod impact hole forming device which comprises a drill pipe which is of a hollow cylindrical structure, an inner cavity of the drill pipe forms a containing space, a stator is fixedly arranged in the inner cavity of the drill pipe, and an impact drill bit is arranged at the bottom end of the drill pipe; the impact hammer is arranged in the drill pipe and used for hitting the impact drill bit in a reciprocating mode; the power supply system is used for supplying power to the stator; electric energy is directly converted into high-frequency and large-amplitude electromagnetic driving impact mechanical energy, and the efficiency and quality of rock drilling and hole forming are remarkably improved; the functions of pneumatic cooling, buffering and chip removal are integrated, and the working reliability and environmental adaptability of the system are enhanced; closed-loop control based on acceleration feedback is adopted to replace high-cost displacement sensing, so that the overall cost is reduced while the motion control precision is ensured; the whole structure is compact, energy conversion is efficient, and the device is suitable for efficient hole forming operation in various rock stratums, deep holes and special environments.

Description

Technical Field

[0001] This invention relates to the field of hole-forming technology, and in particular to an impact hole-forming device for rock-embedded foundation pile anchor rods. Background Technology

[0002] In rock drilling, current technologies primarily rely on hydraulically or pneumatically driven down-the-hole hammers and rotary drilling rigs. Down-the-hole hammers, limited by valve switching and media inertia, exhibit low impact frequency and small amplitude, resulting in low rock-breaking efficiency. Rotary drilling rigs, employing a static grinding rock-breaking mechanism, suffer from high energy consumption and slow drilling speed. Furthermore, traditional equipment generally lacks efficient thermal management, integrated design for debris removal and impact buffering, leading to overheating during prolonged operation, poor borehole cleanliness, and high costs due to reliance on high-precision displacement sensors for control. These factors collectively limit the efficiency, quality, and economy of drilling in deep holes, hard rock formations, and special environments (such as space mining). Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is that existing impact drilling equipment has limited impact frequency and amplitude, and low energy conversion efficiency.

[0004] The above-mentioned technical problems are solved by the following technical solution: This invention proposes a rock-socketed foundation pile anchor bolt impact drilling device, which includes, The drill pipe has a hollow cylindrical structure with an inner cavity that forms a receiving space. A stator is fixedly installed in the inner cavity of the drill pipe, and an impact drill bit is installed at the bottom end of the drill pipe. An impact hammer, located inside the drill pipe, is used to reciprocate and strike the impact drill bit; A power supply system for supplying power to the stator; Specifically, the power supply system supplies power to the stator, and through the electromagnetic interaction between the stator and the impact hammer, drives the impact hammer to reciprocate at high speed along the axial direction inside the drill pipe and continuously impact the impact drill bit, thereby achieving efficient rock drilling and hole formation. By directly converting electrical energy into impact mechanical energy, the energy conversion efficiency is high, overcoming the technical defects of low frequency and small amplitude of traditional hydraulic or pneumatic impact equipment.

[0005] In a preferred embodiment of the rock-embedded foundation pile anchor bolt impact drilling device of the present invention: the stator includes an annular magnetic core extending axially in the inner cavity of the drill pipe, and an electromagnetic coil surrounding the outer side of the annular magnetic core. A plurality of the electromagnetic coils are continuously arranged and distributed in the inner cavity of the drill pipe along the axial direction of the drill pipe to form a predetermined axial distribution range. Specifically, the annular magnetic core provides magnetic circuit support for the electromagnetic coils, and the distribution range formed by the axial arrangement of multiple electromagnetic coils matches the travel stroke of the impact hammer. When the power supply system supplies power to each electromagnetic coil in a specific sequence, a traveling wave magnetic field moving axially will be generated around it, ensuring that the impact hammer is subjected to continuous and uniform electromagnetic thrust throughout the entire movement process, thereby achieving stable impact with high frequency and large amplitude, and significantly improving rock breaking efficiency.

[0006] In a preferred embodiment of the rock-embedded foundation pile anchor bolt impact drilling device of the present invention: the impact hammer is slidably disposed inside the drill pipe, the magnetic ring is embedded on the outside of the hammer body, the impact head is fixedly connected to one end of the hammer body, and the buffer head is fixedly connected to the other end of the hammer body; the electromagnetic coil has the same width as the magnetic ring. Specifically, when the traveling wave magnetic field moves, the magnetic ring is subjected to alternating electromagnetic force, which drives the entire impact hammer to accelerate along the drill pipe axis. The impact head directly impacts the impact drill bit, transferring kinetic energy to the rock formation. The buffer head buffers and resets at the end of the return stroke, which not only eliminates the radial displacement of the impact hammer and plays a good electromagnetic guiding role, but also makes the impact process more stable and reliable.

[0007] In a preferred embodiment of the rock-embedded foundation pile anchor rod impact drilling device of the present invention: the output end face of the impact drill bit is inlaid with a rock-breaking tool, and the inside of the impact drill bit is provided with a through exhaust channel. The exhaust channel extends vertically downward from the top of the impact drill bit and branches into multiple sub-exhaust channels in all directions near the output end of the impact drill bit. The sub-exhaust channels are distributed in a ring on the output end face of the impact drill bit. Specifically, the rock-breaking tool is made of high-strength alloy and acts directly on the rock surface for crushing. Under the reciprocating impact of the impact hammer, its piston effect compresses the air in the lower part of the drill pipe. The compressed air enters from the top inlet through the exhaust channel and is ejected at high speed from multiple annularly distributed sub-exhaust channels at the bottom. This high-speed airflow can effectively blow away rock debris at the bottom of the borehole, keep the bottom of the hole clean, prevent repeated crushing, and thus further improve the drilling efficiency and drilling quality.

[0008] In a preferred embodiment of the rock-embedded foundation pile anchor bolt impact drilling device of the present invention: the top end of the drill pipe is also connected to a drill rod connector, the drill rod connector has a through air inlet, and the bottom end of the drill rod connector is connected to a three-way connector; the three-way connector includes a first port, a second port and a third port, and the first port of the three-way connector is connected to the air inlet. Specifically, the external drill rod is connected to the drill rod connector, which can drive the entire device to rotate, realize rotary impact drilling, and improve the drilling efficiency; external compressed air is introduced through the air inlet on the drill rod connector and enters the three-way connector, which can realize air path diversion, providing a basis for subsequent electrical cooling and air supply to the drill pipe cavity.

[0009] In a preferred embodiment of the rock-embedded foundation pile anchor bolt impact drilling device of the present invention: the second port of the three-way connector is connected to a throttle valve, the other end of the throttle valve is connected to a buffer, and the third port of the three-way connector is connected to an electrical compartment; the two ends of the buffer space inside the buffer are respectively connected to the throttle valve and the drill pipe. Specifically, a portion of the introduced compressed air enters the electrical compartment through the third port of the three-way connector, providing forced air cooling to the internal power module and other electrical components to ensure their reliability during long-term operation. The other portion of the air enters the buffer through the second port via the throttle valve and finally flows into the inner cavity of the drill pipe. This portion of air serves two purposes: firstly, it flows through the tiny gap between the stator and the impact hammer, cooling the electromagnetic coil that generates heat during operation; secondly, under the adjustment of the buffer and the throttle valve, it forms an air cushion buffer when the impact hammer returns to the top dead center. By adjusting the throttle valve, the buffer strength can be controlled, allowing the impact hammer to decelerate smoothly to zero, effectively protecting the equipment structure.

[0010] In a preferred embodiment of the rock-embedded foundation pile anchor bolt impact drilling device of the present invention: sealing rings are provided at both ends of the air inlet; Specifically, the design ensures the airtightness of the compressed air delivery channel, prevents pressure leakage, and guarantees sufficient flow and pressure for cooling and buffering air.

[0011] In a preferred embodiment of the rock-embedded foundation pile anchor bolt impact drilling device of the present invention: the buffer head is provided with an acceleration wireless sensor, and sensor antennas are respectively provided on the outside of the acceleration wireless sensor and the three-way connector; The acceleration of the impact hammer is measured by the wireless acceleration sensor and then integrated to obtain its velocity and dynamic displacement. ; ; In the formula, The real-time acceleration of the impact hammer is measured by the wireless acceleration sensor. and represent the initial velocity and initial displacement of the impact hammer, respectively. The initial velocity and initial displacement of the impact hammer at startup are zero, i.e. = =0; The speed and dynamic displacement of the impact hammer are calculated according to the formula, and the on / off sequence of the electromagnetic coil and the frequency and phase of the power supply are controlled to form a traveling wave magnetic field that drives the impact hammer to move continuously. Specifically, the wireless acceleration sensor monitors the motion state of the impact hammer in real time. The data is wirelessly transmitted to the control system via the sensor antenna. The control system integrates the acceleration signal and calculates the precise velocity and displacement of the impact hammer in real time. Based on this feedback information, the phase, frequency, and energizing sequence of the current supplied to each electromagnetic coil are dynamically adjusted so that the velocity of the generated traveling wave magnetic field is always synchronized with the real-time velocity of the impact hammer. This method replaces complex and expensive displacement measuring devices such as grating rulers, achieving high-precision control of the impact hammer's motion trajectory at a lower cost and ensuring efficient and stable electromagnetic drive.

[0012] In a preferred embodiment of the rock-embedded foundation pile anchor bolt impact drilling device of the present invention: one end of the drill pipe is provided with a key, a guide sleeve located at one end of the key, a limiting ring located at one end of the guide sleeve, and a locking cylinder limited by the limiting ring and connected to the bottom end of the drill pipe; the guide sleeve is located between the key and the limiting ring; the top end of the guide sleeve has a receiving cavity communicating with the inner cavity of the drill pipe and the exhaust channel and suitable for accommodating the impact head; the locking cylinder is used to connect the drill pipe and the impact drill bit. Specifically, the locking key is used to axially fix the lower end of the annular magnetic core, the guide sleeve not only provides guidance for the impact head, but its internal receiving cavity can also ensure that compressed air can flow to the exhaust channel; the limiting ring and the locking cylinder work together to firmly lock the guide sleeve and the impact drill bit at the bottom end of the drill tube.

[0013] In a preferred embodiment of the rock-embedded foundation pile anchor bolt impact drilling device of the present invention: the power supply system includes a DC power supply and an inverter, which is used to convert DC power into three-phase AC power with adjustable frequency and phase, and to supply power to the electromagnetic coils, so as to form the traveling wave magnetic field by controlling the on and off sequence of each electromagnetic coil, thereby driving the impact hammer to move. Specifically, the DC power supply provides stable input power, and the inverter is preferably an IGBT or SiCMOSFET three-phase full-bridge inverter with high efficiency and high-frequency switching characteristics. The control system generates a corresponding SVPWM (space vector pulse width modulation) signal to control the inverter based on the real-time position and speed feedback of the impact hammer, and outputs three-phase AC power with precise controllable frequency and phase to each of the electromagnetic coils. By precisely controlling the commutation sequence and phase difference of the current in each phase coil, a continuously moving traveling wave magnetic field is formed in the axial direction, thereby continuously and efficiently driving the impact hammer.

[0014] The beneficial effects of this invention are as follows: It includes, The drill pipe has a hollow cylindrical structure with an inner cavity that forms a receiving space. A stator is fixedly installed in the inner cavity of the drill pipe, and an impact drill bit is installed at the bottom end of the drill pipe. An impact hammer, located inside the drill pipe, is used to reciprocate and strike the impact drill bit; The power supply system supplies power to the stator; by directly converting electrical energy into high-frequency and large-amplitude electromagnetic drive impact mechanical energy, it significantly improves the efficiency and quality of rock drilling; it integrates pneumatic cooling, buffering, and chip removal functions, enhancing the system's reliability and environmental adaptability; it adopts closed-loop control based on acceleration feedback to replace high-cost displacement sensing, reducing overall costs while ensuring motion control accuracy; the overall structure is compact and energy conversion is highly efficient, making it suitable for efficient drilling operations in various rock formations, deep holes, and special environments. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention.

[0016] Figure 1 A schematic diagram showing the overall working state of the present invention is shown.

[0017] Figure 2 A schematic diagram of the overall working state of the present invention is shown.

[0018] Figure 3 A schematic diagram of the drill pipe of the present invention is shown.

[0019] Figure 4 A schematic diagram of the stator of the present invention is shown.

[0020] Figure 5 A schematic diagram of the impact hammer of the present invention is shown.

[0021] Figure 6 A schematic diagram of the impact drill bit of the present invention is shown.

[0022] Figure 7 A schematic diagram of the exhaust duct of the present invention is shown.

[0023] Figure 8 A schematic diagram of the drill bit connector of the present invention is shown.

[0024] Figure 9 An enlarged structural schematic diagram of part A of the present invention is shown.

[0025] Figure 10 An enlarged schematic diagram of part B of the present invention is shown. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0027] The terminology used in this invention refers to those general terms currently widely used in the art in consideration of the functionality of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new techniques. Furthermore, specific terms may be chosen independently, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terminology used in this specification should not be construed as simple names, but rather based on the meaning of the terms and the overall description of the invention.

[0028] Reference Figures 1-10 This embodiment provides a rock-socketed foundation pile anchor bolt impact drilling device, which includes, The drill pipe 1 is a hollow cylindrical structure with an inner cavity forming a receiving space. A stator 11 is fixedly installed in the inner cavity of the drill pipe 1, and an impact drill bit 12 is installed at the bottom end of the drill pipe 1. The impact hammer 2 is installed inside the drill pipe 1 and is used to reciprocate to strike the impact drill bit 12; A power supply system for supplying power to stator 11; Specifically, the power supply system supplies power to the stator 11. Through the electromagnetic interaction between the stator 11 and the impact hammer 2, the impact hammer 2 is driven to reciprocate at high speed along the axial direction inside the drill pipe 1 and continuously impact the impact drill bit 12, thereby achieving efficient rock drilling and hole formation. By directly converting electrical energy into impact mechanical energy, the energy conversion efficiency is high, which overcomes the technical defects of low frequency and small amplitude of traditional hydraulic or pneumatic impact equipment.

[0029] As one embodiment provided, such as Figures 1-7 The stator 11 includes an annular magnetic core 111 extending axially into the inner cavity of the drill pipe 1, and an electromagnetic coil 112 surrounding the outer side of the annular magnetic core 111. A plurality of electromagnetic coils 112 are continuously arranged and distributed along the axial direction of the drill pipe 1 in the inner cavity of the drill pipe 1 to form a predetermined axial distribution range. Specifically, the annular magnetic core 111 provides magnetic circuit support for the electromagnetic coils 112, and the distribution range formed by the multiple electromagnetic coils 112 arranged along the axial direction matches the movement stroke of the impact hammer 2. When the power supply system supplies power to each electromagnetic coil 112 in a specific sequence, a traveling wave magnetic field 42 moving along the axial direction will be generated around it, ensuring that the impact hammer 2 can be subjected to continuous and uniform electromagnetic thrust throughout the entire movement process, thereby realizing stable impact with high frequency and large amplitude, and significantly improving rock breaking efficiency.

[0030] The impact hammer 2 is slidably disposed inside the drill pipe 1. The hammer body 21, the magnetic ring 22 embedded on the outside of the hammer body 21, the impact head 23 fixedly connected to one end of the hammer body 21, and the buffer head 24 fixedly connected to the other end of the hammer body 21; the electromagnetic coil 112 has the same width as the magnetic ring 22. The number m of magnetic rings 22 is determined according to the electromagnetic thrust design requirements of the impact hammer 2. The electromagnetic thrust of the mover is calculated according to F=m×f, where f is the electromagnetic thrust of a single strong magnetic ring 22. The width w0 of the electromagnetic coil 112 is equal to the width w1 of the magnetic ring 22, i.e., w0 = w1; and the spacing between adjacent magnetic rings 22 is also w1. Since the magnetic rings 22 are spaced apart, and the impact hammer 2 needs a certain distance for reciprocating motion (i.e., the length of the hammer body 21 cannot extend completely along the distribution range of the magnetic rings 22), the number n of electromagnetic coils 112 is greater than the number m of magnetic rings 22. Through the interaction between the magnetic rings 22 and the stator 11 of the impact hammer 2, the impact hammer 2 can perform axial reciprocating motion to strike the impact drill bit 12. Specifically, when the traveling wave magnetic field 42 moves, the magnetic ring 22 is subjected to alternating electromagnetic force, which drives the entire impact hammer 2 to accelerate along the axial direction of the drill pipe 1. The impact head 23 directly impacts the impact drill bit 12, transferring kinetic energy to the rock formation. The buffer head 24 buffers and resets at the end of the return stroke, which not only eliminates the radial displacement of the impact hammer 2 and plays a good electromagnetic guiding role, but also makes the impact process more stable and reliable.

[0031] The output end face of the impact drill bit 12 is inlaid with a rock-breaking cutter 121. The interior of the impact drill bit 12 has a through exhaust channel 122. The exhaust channel 122 extends vertically downward from the top of the impact drill bit 12 and branches into multiple sub-exhaust channels 122 near the output end of the impact drill bit 12. The sub-exhaust channels 122 are distributed in a ring on the output end face of the impact drill bit 12. Specifically, the rock-breaking tool 121 is made of high-strength alloy and acts directly on the rock surface for crushing. Under the reciprocating impact of the impact hammer 2, its piston effect compresses the air at the bottom of the drill pipe 1. The compressed air enters from the top inlet through the exhaust channel 122 and is ejected at high speed from multiple annular sub-exhaust channels 122 at the bottom. This high-speed airflow can effectively blow away the rock debris at the bottom of the borehole, keep the bottom of the hole clean, prevent repeated crushing, and thus further improve the drilling efficiency and drilling quality.

[0032] As one embodiment provided, such as Figure 1 , Figure 2 and Figure 8The top end of the drill pipe 1 is also connected to the drill rod connector 3. The drill rod connector 3 has a through air intake 31 inside. The bottom end of the drill rod connector 3 is connected to a three-way connector 32. The three-way connector 32 includes a first port, a second port and a third port. The first port of the three-way connector 32 is connected to the air intake 31. Specifically, the external drill rod is connected to the drill rod connector 3, which can drive the entire device to rotate, realize rotary impact drilling, and improve the drilling efficiency; external compressed air is introduced through the air inlet 31 on the drill rod connector 3 and enters the three-way connector 32, which can realize air path diversion, providing a basis for subsequent electrical cooling and air supply to the inner cavity of the drill pipe.

[0033] The second port of the three-way connector 32 is connected to the throttle valve 33, the other end of the throttle valve 33 is connected to the buffer 34, and the third port of the three-way connector 32 is connected to the electrical compartment 35; the two ends of the buffer space inside the buffer 34 are connected to the throttle valve 33 and the drill pipe 1, respectively. Specifically, part of the introduced compressed air enters the electrical compartment 35 through the third port of the three-way connector 32, providing forced air cooling for the internal power module and other electrical components to ensure their reliability during long-term operation. The other part of the air enters the buffer 34 through the second port via the throttle valve 33, and finally flows into the inner cavity of the drill pipe 1. This part of the air has two functions: first, it flows through the tiny gap between the stator 11 and the impact hammer 2 to cool the electromagnetic coil 112, which generates heat during operation; second, under the adjustment of the buffer 34 and the throttle valve 33, it can form an air cushion buffer when the impact hammer 2 returns to the top dead center. By adjusting the throttle valve 33, the buffer strength can be controlled, allowing the impact hammer 2 to decelerate smoothly to zero, effectively protecting the equipment structure.

[0034] Sealing rings 36 are provided at both ends of the air intake 31; Specifically, the design ensures the airtightness of the compressed air delivery channel, prevents pressure leakage, and guarantees sufficient flow and pressure for cooling and buffering air.

[0035] As one embodiment provided, such as Figure 10 The buffer head 24 is equipped with an acceleration wireless sensor 4 and sensor antennas 41 respectively located on the outside of the acceleration wireless sensor 4 and the three-way connector 32. The acceleration of the impact hammer 2 is measured by the wireless acceleration sensor 4 and then integrated to obtain its velocity and dynamic displacement. ; ; In the formula, The real-time acceleration of the impact hammer 2 is measured by the wireless acceleration sensor 4; and represent the initial velocity and initial displacement of impact hammer 2, respectively. The initial velocity and initial displacement of impact hammer 2 at startup are zero, i.e. = =0; The speed and dynamic displacement of the impact hammer 2 are calculated according to the formula. The energizing / disengaging sequence of the electromagnetic coil 112 and the frequency and phase of the power supply are controlled to form a traveling wave magnetic field 42 that drives the impact hammer 2 to move continuously. Specifically, the wireless acceleration sensor 4 monitors the motion state of the impact hammer 2 in real time. The data is wirelessly transmitted to the control system via the sensor antenna 41. The control system integrates the acceleration signal and calculates the precise velocity and displacement of the impact hammer 2 in real time. Based on this feedback information, the phase, frequency and energizing sequence of the current supplied to each electromagnetic coil 112 are dynamically adjusted so that the velocity of the generated traveling wave magnetic field 42 is always synchronized with the real-time velocity of the impact hammer 2. This method replaces complex and expensive displacement measuring devices such as grating rulers, and achieves high-precision control of the impact hammer's motion trajectory at a lower cost, ensuring efficient and stable electromagnetic drive.

[0036] The power supply system includes a DC power supply and an inverter, which converts DC power into three-phase AC power with adjustable frequency and phase, and supplies power to the electromagnetic coil 112. The traveling wave magnetic field 42 can be formed by controlling the on and off sequence of each electromagnetic coil 112, which drives the impact hammer 2 to move. Using IGBT or SiC MOSFET three-phase full-bridge inverters, the following power control scheme is implemented: ① Power phase control Electromagnetic coil 112 consists of three-phase windings (AD, BE, CF), with the current phase of each phase winding separated by 120°; the current phase is calculated based on the mover position x(t) calculated by the formula. ( (The width of the electromagnetic coil 112 and the strong magnetic ring 22) generates a three-phase sinusoidal current: , , ; When the aforementioned three-phase current is passed through the stator electromagnetic coil 112, a continuously moving axisymmetric traveling wave magnetic field 42 with a polarity opposite to that of the magnetic ring 22 will be formed.

[0037] ② Dynamic control of power supply frequency During the reciprocating motion of the impact hammer 2, the traveling speed of the traveling wave magnetic field 42 needs to be synchronized with the moving speed of the mover. Based on the mover velocity v(t) calculated by the formula, the power supply frequency is dynamically adjusted to... .

[0038] ③ Stator electromagnetic coil 112 on / off sequence control According to the arrangement of the stator electromagnetic coils 112 and the mover strong magnetic rings 22 of the device of the present invention, at the initial moment, the strong magnetic rings 22 of the mover (numbers 1, 2, 3, and 4, with m=4 magnetic rings 22) are aligned with the stator electromagnetic coils 4 of number 1, 3, 5, and 7, respectively. During the striking stroke (moving the mover moves downward), for every distance w0 moved, the four sets of electromagnetic coils 112 are activated, forming a traveling wave magnetic field 42 to drive the mover downward; according to the dynamic position x(t) of the mover, each electromagnetic coil 112 is activated in the order listed in the table below (unactivated electromagnetic coils 112 are in a de-energized state), and the phase of each phase current is controlled.

[0039] ④ Inverter switching control method of the power supply The inverter uses a three-phase full-bridge inverter with IGBT or SiC MOSFET, and the upper and lower bridge arms of each phase are complementary in conduction; the switching control signal is generated based on space vector pulse width modulation (SVPWM).

[0040] ⑤ Measures to prevent inverter short circuits Set the switching dead time to T. dead =100ns, to prevent short circuits between the upper and lower arms of each phase.

[0041] ⑥ Return control The control scheme for the return stroke of the impact hammer 2 is the opposite of the above (impact stroke) scheme, and reduces the three-phase peak current to half of the impact stroke (I0 / 2).

[0042] Specifically, the DC power supply provides stable input power, and the inverter is preferably an IGBT or SiC MOSFET three-phase full-bridge inverter with high efficiency and high-frequency switching characteristics. The control system generates corresponding SVPWM (space vector pulse width modulation) signals to control the inverter based on the real-time position and speed feedback of the impact hammer 2, and outputs three-phase AC power with precise controllable frequency and phase to each electromagnetic coil 112. By precisely controlling the commutation sequence and phase difference of the current in each phase coil, a continuously moving traveling wave magnetic field 42 is formed in the axial direction, thereby continuously and efficiently driving the impact hammer 2.

[0043] As one embodiment provided, such as Figure 9 One end of the drill pipe 1 is fitted with a key 5, a guide sleeve 6 located at one end of the key 5, a limiting ring 7 located at one end of the guide sleeve 6, and a locking cylinder 8 that is limited by the limiting ring 7 and connected to the bottom end of the drill pipe 1; the guide sleeve 6 is limited between the key 5 and the limiting ring 7; the top end of the guide sleeve 6 has a receiving cavity that communicates with the inner cavity of the drill pipe 1 and the exhaust channel 122 and is suitable for accommodating the impact head 23; the locking cylinder 8 is used to connect the drill pipe 1 and the impact drill bit 12. Specifically, the key 5 is used to axially fix the lower end of the annular magnetic core 111, the guide sleeve 6 not only provides guidance for the impact head 23, but its internal cavity can also ensure that compressed air can flow to the exhaust port 122; the limiting ring 7 and the locking cylinder 8 work together to firmly lock the guide sleeve 6 and the impact drill bit 12 to the bottom end of the drill pipe 1.

[0044] In summary, the power supply system supplies power to the stator 11. Multiple electromagnetic coils 112 within the stator 11 are arranged continuously along the axial direction of the drill pipe 1, supported by a ring-shaped magnetic core 111. When the power supply system supplies each electromagnetic coil 112 with a frequency and phase adjustable three-phase alternating current according to a set sequence, a traveling wave magnetic field 42 continuously moves axially around it. Multiple magnetic rings 22 embedded on the outside of the hammer body 21 of the impact hammer 2 are subjected to alternating electromagnetic force under the action of the traveling wave magnetic field 42, driving the impact hammer 2 to reciprocate at high speed along the inner cavity of the drill pipe 1. The impact head 23 at the front end of the impact hammer 2 strikes the impact drill bit 12 at the end of its stroke. The high-strength alloy rock-breaking cutter 121 embedded on the end face of the impact drill bit 12 transfers the impact kinetic energy to the rock layer, achieving efficient crushing. Simultaneously, the introduced compressed air enters the three-way connector 32 through the air inlet 31 of the drill rod connector 3 and is divided into two paths: one path enters the electrical compartment 35 through the third port to connect the electrical components. The air is cooled by passing through a second port, a throttle valve 33, and a buffer 34 into the inner cavity of the drill pipe 1. It flows through the gap between the stator 11 and the impact hammer 2 to cool the electromagnetic coil 112. When the impact hammer 2 returns to the top dead center, the throttle valve 33 is adjusted to form an air cushion buffer to achieve smooth deceleration. The piston effect of the reciprocating motion of the impact hammer 2 compresses the air in the lower part of the drill pipe 1 and enters the exhaust channel 122 of the impact drill bit 12 through the receiving cavity opened at the top of the guide sleeve 6. Finally, it is ejected at high speed from multiple sub-exhaust channels 122 distributed in a ring on the end face of the drill bit to blow away the rock cuttings at the bottom of the hole in time. In addition, the acceleration wireless sensor 4 installed in the buffer head 24 detects the acceleration of the impact hammer 2 in real time and transmits it to the control system through the sensor antenna 41. The real-time speed and displacement are obtained through integration calculation, and then the power supply parameters of the electromagnetic coil 112 are dynamically adjusted to achieve precise synchronization between the traveling wave magnetic field 42 and the movement of the impact hammer 2.

[0045] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A rock-embedded foundation pile anchor bolt impact drilling device, characterized in that: include, The drill pipe (1) is a hollow cylindrical structure with an inner cavity forming a receiving space. A stator (11) is fixedly installed in the inner cavity of the drill pipe (1), and an impact drill bit (12) is installed at the bottom end of the drill pipe (1). An impact hammer (2) is installed inside the drill pipe (1) and is used to reciprocate to strike the impact drill bit (12). A power supply system for supplying power to the stator (11).

2. The rock-embedded foundation pile anchor bolt impact drilling device according to claim 1, characterized in that: The stator (11) includes an annular magnetic core (111) extending axially into the inner cavity of the drill pipe (1) and an electromagnetic coil (112) surrounding the outer side of the annular magnetic core (111). A plurality of electromagnetic coils (112) are continuously arranged in the inner cavity of the drill pipe (1) along the axial direction of the drill pipe (1) to form a predetermined axial distribution range.

3. The rock-embedded foundation pile anchor bolt impact drilling device according to claim 2, characterized in that: The impact hammer (2) is slidably disposed inside the drill pipe (1) with a hammer body (21), a magnetic ring (22) embedded on the outside of the hammer body (21), an impact head (23) fixedly connected to one end of the hammer body (21), and a buffer head (24) fixedly connected to the other end of the hammer body (21); the electromagnetic coil (112) has the same width as the magnetic ring (22).

4. The rock-embedded foundation pile anchor bolt impact drilling device according to claim 3, characterized in that: The output end face of the impact drill bit (12) is inlaid with a rock-breaking tool (121). The interior of the impact drill bit (12) is provided with a through exhaust channel (122). The exhaust channel (122) extends vertically downward from the top of the impact drill bit (12) and branches into multiple sub-exhaust channels (122) near the output end of the impact drill bit (12). The sub-exhaust channels (122) are distributed in a ring on the output end face of the impact drill bit (12).

5. The rock-embedded foundation pile anchor bolt impact drilling device according to claim 4, characterized in that: The top end of the drill pipe (1) is also connected to a drill rod connector (3), and the drill rod connector (3) has a through air intake (31) inside. The bottom end of the drill rod connector (3) is connected to a three-way connector (32). The three-way connector (32) includes a first port, a second port and a third port, and the first port of the three-way connector (32) is connected to the air intake (31).

6. The rock-embedded foundation pile anchor bolt impact drilling device according to claim 5, characterized in that: The second port of the three-way connector (32) is connected to the throttle valve (33), the other end of the throttle valve (33) is connected to the buffer (34), and the third port of the three-way connector (32) is connected to the electrical compartment (35); the two ends of the buffer space inside the buffer (34) are connected to the throttle valve (33) and the drill pipe (1) respectively.

7. The rock-embedded foundation pile anchor bolt impact drilling device according to claim 5 or 6, characterized in that: The air intake (31) is provided with sealing rings (36) at both ends.

8. The rock-embedded foundation pile anchor bolt impact drilling device according to claim 7, characterized in that: The buffer head (24) is equipped with an acceleration wireless sensor (4) inside, and sensor antennas (41) are respectively disposed on the outside of the acceleration wireless sensor (4) and the three-way connector (32). The acceleration of the impact hammer (2) is measured by the wireless acceleration sensor (4), and its velocity and dynamic displacement are calculated by integration. ； ； In the formula, The real-time acceleration of the impact hammer (2) is measured by the wireless acceleration sensor (4); and represent the initial velocity and initial displacement of the impact hammer (2), respectively. The initial velocity and initial displacement of the impact hammer (2) at startup are zero, i.e. = =0; The speed and dynamic displacement of the impact hammer (2) are calculated according to the formula. The power-on / off sequence of the electromagnetic coil (112) and the frequency and phase of the power supply are controlled to form a traveling wave magnetic field (42) that drives the impact hammer (2) to move continuously.

9. The rock-embedded foundation pile anchor bolt impact drilling device according to claim 8, characterized in that: One end of the drill pipe (1) is fitted with a key (5), a guide sleeve (6) located at one end of the key (5), a limiting ring (7) located at one end of the guide sleeve (6), and a locking cylinder (8) limited by the limiting ring (7) and connected to the bottom end of the drill pipe (1); the guide sleeve (6) is located between the key (5) and the limiting ring (7); the top end of the guide sleeve (6) is provided with a receiving cavity that communicates with the inner cavity of the drill pipe (1) and the exhaust channel (122) and is suitable for accommodating the impact head (23); the locking cylinder (8) is used to connect the drill pipe (1) and the impact drill bit (12).

10. The rock-embedded foundation pile anchor bolt impact drilling device according to claim 8 or 9, characterized in that: The power supply system includes a DC power supply and an inverter for converting DC power into three-phase AC power with adjustable frequency and phase, and for powering the electromagnetic coils (112) to form the traveling wave magnetic field (42) by controlling the on and off sequence of each electromagnetic coil (112), thereby driving the impact hammer (2) to move.

Images