Electromagnetic resonance impact tool

Abstract

The invention discloses an electromagnetic resonance impact tool, and relates to the technical field of well drilling, the electromagnetic resonance impact tool comprises a drill rod, and further comprises a slip ring fixedly sleeved in the circumferential direction of the drill rod; the filter is sleeved and fixed in the circumferential direction of the drill rod and is positioned below the slip ring; the electromagnetic resonator comprises a shell, a telescopic shaft, a spring and an electromagnetic coil, a cavity is formed in the shell, the shell is arranged at the bottom end of the drill rod, the telescopic shaft vertically penetrates through the cavity, the top end of the telescopic shaft is arranged at the bottom end of the drill rod, the telescopic shaft is sleeved with the spring and the electromagnetic coil, and the top end of the spring is fixed to the top in the cavity. The bottom end of the spring abuts against the top of the electromagnetic coil. The drill is arranged at the bottom end of the telescopic shaft. The device has the advantages that under the action of an electromagnetic field, the spring drives the drill bit to stretch out and draw back in a reciprocating mode to form the impact frequency of electromagnetic resonance excitation, and when the impact frequency is consistent with the inherent frequency of the rock when the drill bit breaks the rock, the rock generates resonance for stable rock breaking.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling, and specifically relates to an electromagnetic resonance impact tool. Background Art

[0002] For many years, people have been trying the idea of using impact energy to drill holes in hard rock formations during drilling operations. Many tools have been developed over the years and they all have similar working principles. Among them, a piston operated by compressed air or hydraulic pressure impacts the drill pipe, converting the potential energy of the fluid into the kinetic energy of the drill bit. However, the result is that the rock is fragmented and crushed, and the drill bit inside the drill string penetrates into the rock formation together. To avoid this situation, tools using electromagnetic impact for rock breaking have been developed. Using electromagnetic impact for rock breaking is a new type of rock-breaking tool that combines electromagnetic drive technology and the principle of impact rock breaking, and has the characteristics of high efficiency, low energy consumption, and flexible operation.

[0003] The electromagnetic impact rock-breaking device mainly drives the impact head or drill bit to impact and break the rock through electromagnetic force. Its core principle is to use an electromagnetic coil to generate a magnetic field, and by controlling the direction and magnitude of the current, the impact head or drill bit is made to perform reciprocating motion, thereby applying high-frequency impact force to the rock. Existing electromagnetic impact rock-breaking devices also mainly set up structures that generate electromagnetic fields and use the magnetic force generated by the electromagnetic fields to assist the drill bit in rock breaking. However, the main force of this method is superimposed on the impact motion of the drill bit, which will cause the drilling pressure of the drill bit to be too large and the impact force to be unstable, resulting in poor wellbore stability, inability to break the rock stably, and seriously affecting the efficiency of rock breaking. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides an electromagnetic resonance impact tool that uses electromagnetic resonance impact. By using an electromagnetic resonator to adjust the frequency and amplitude of the dynamic load, the resonance condition between the drill bit and the formation is maintained under different drilling conditions to stably break the rock.

[0005] The present invention provides an electromagnetic resonance impact tool, including: a drill pipe, and further including: A slip ring, sleeved and fixed on the circumference of the drill pipe; A filter, sleeved and fixed on the circumference of the drill pipe, located below the slip ring; An electromagnetic resonator, including a housing, a telescopic shaft, a spring, and an electromagnetic coil. The housing has a cavity inside. The housing is arranged at the bottom end of the drill pipe. The telescopic shaft is vertically arranged in the cavity. The top end of the telescopic shaft is arranged at the bottom end of the drill pipe. The spring and the electromagnetic coil are both sleeved on the circumference of the telescopic shaft. The top end of the spring is fixed to the top inside of the cavity, and the bottom end of the spring abuts against the top of the electromagnetic coil. The filter filters the electrical signal transmitted by the slip ring and then transmits it to the electromagnetic coil. After receiving the electrical signal, the electromagnetic coil generates an electromagnetic field; The drill bit is arranged at the bottom end of the telescopic shaft. Under the action of the electromagnetic field, the spring drives the drill bit to reciprocate telescopically to form an impact frequency excited by electromagnetic resonance. When this impact frequency is consistent with the natural frequency of the rock when the drill bit breaks the rock, the rock resonates to break the rock stably.

[0006] Preferably, two insulating tubes are sleeved on the telescopic shaft, the electromagnetic coils are respectively sleeved on the two insulating tubes, and the electromagnetic coils are in circumferential contact with the telescopic shaft.

[0007] Preferably, the telescopic shaft includes: The first shaft, the spring is sleeved on the circumference of the first shaft, and the top end of the first shaft is detachably connected to the bottom end of the drill pipe; A plurality of sleeves are sleeved in sequence from head to tail. The sleeve located at the uppermost part is arranged at the bottom end of the first shaft, and the thrust ball bearing and the insulating tube are respectively sleeved on the circumferences of the plurality of sleeves; The second shaft is arranged through the bottom of the housing. The top end of the second shaft is located in the cavity, the bottom end of the second shaft is located outside the housing, the drill bit is fixed at the bottom end of the second shaft, and the top end of the second shaft is sleeved in the sleeve located at the lowermost part. There is a sliding connection between adjacent two sleeves and between the second shaft and the sleeve through a limiting structure.

[0008] Preferably, the top end of the spring is fixed to the inner top of the cavity through a spring pad, and the spring pad is sleeved and fixed on the circumference of the first shaft; the bottom end of the electromagnetic coil abuts against the inner bottom of the cavity through a coil pad, and the coil pad is sleeved and fixed on the circumference of the second shaft.

[0009] Preferably, the detachable connection structure between the first shaft and the drill pipe includes: The adapter shaft is vertically arranged at the bottom end of the drill pipe; The plug pin is arranged at the bottom end of the adapter shaft. A through hole is opened at the top of the first shaft, the plug pin is sleeved in the through hole, and the plug pin is threadedly connected to the hole wall of the through hole.

[0010] Preferably, at least one air hole is opened on the through hole, and the air hole horizontally penetrates the first shaft.

[0011] Preferably, a thrust ball bearing is sleeved on the circumference of the sleeve, the bottom end of the spring is fixed to the top end of the thrust ball bearing, and the bottom end of the thrust ball bearing contacts the top end of the electromagnetic coil.

[0012] Preferably, it further includes: Spring washer, the adapter shaft includes two shaft bodies with different diameters, the diameter of the lower shaft body is smaller than that of the upper shaft body, and the spring washer is sleeved on the circumference of the lower shaft body; Spring washer fixing ring, sleeved and fixed on the circumference of the spring washer, and the top end of the spring washer fixing ring is fixed to the bottom end of the upper shaft body.

[0013] Preferably, the outer diameter of the spring washer is equal to the inner diameter of the thrust ball bearing.

[0014] Compared with the prior art, the present invention discloses an electromagnetic resonance impact tool, and its beneficial effects are as follows: This device uses electromagnetic resonance impact. By using an electromagnetic resonator to adjust the frequency and amplitude of the dynamic load, the resonance condition between the drill bit and the formation is maintained under different drilling conditions to generate a stable and expanding fracture zone, so as to achieve the purpose of efficiently breaking hard rock formations. At the same time, it also reduces the axial impact on the drill bit and increases the service life of the drill bit. During specific operation, when the electromagnetic coil is energized, magnetic fields are generated at its two poles, and the filter also generates a fixed electrical frequency. This electrical frequency can affect the magnitude of the magnetic field attraction. The magnetic field attraction pulls the spring downward, and at the same time, the elastic force of the spring itself, the electromagnetic force of the magnetic field at the other pole, and the influence of the filter on the magnitude of the magnetic field attraction work together. When reaching a specific electrical frequency, the magnetic field attraction becomes smaller, which can also reset the spring. The spring reciprocates in stretching and compression, forming a telescopic frequency inherent to the device system itself. When this telescopic frequency is consistent with the inherent frequency of the broken rock, a vibration phenomenon with a sharp increase in amplitude is generated, thus assisting the drill bit in breaking rock, improving the drilling rate, and at the same time, the rock generates resonance, which can also enhance the stability of rock breaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 It is a schematic structural diagram of the present invention; Figure 2 It is an internal structural diagram of the electromagnetic resonator of the present invention; Figure 3 It is a schematic structural diagram of the telescopic shaft of the present invention; Figure 4 It is a top view of the electromagnetic coil of the present invention; Figure 5 It is a side view of the electromagnetic coil of the present invention; Figure 6 Schematic diagram of the internal structure of the electromagnetic coil of the present invention; Figure 7 Schematic diagram of the structure of the slip ring of the present invention.

[0017] Meanings of each label in the figure: 1 - bracket, 2 - slip ring, 3 - drill pipe, 4 - filter, 5 - transfer shaft, 6 - pin, 7 - electromagnetic resonator, 8 - drill bit, 9 - spring washer, 10 - through hole, 11 - air hole, 12 - spring, 13 - telescopic shaft, 14 - thrust ball bearing, 15 - electromagnetic coil, 16 - coil gasket, 17 - housing, 18 - first sleeve, 19 - second sleeve, 20 - third sleeve, 21 - second shaft, 22 - spring washer gasket, 23 - spring washer fixing ring, 24 - limiting member, 25 - brush, 26 - insulating tube. Specific embodiments

[0018] The following will describe in detail a specific embodiment of the present invention with reference to the accompanying drawings. It should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0019] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the technical solutions of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0020] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0021] In addition, in the description of the present invention, "a plurality of" means two or more than two. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as implying or indicating relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0022] Embodiment 1 An embodiment of the present invention provides an electromagnetic resonance impact tool such as Figure 1As shown in the figure, it includes: drill pipe 3, slip ring 2, filter 4, electromagnetic resonator 7, and drill bit 8. The drill pipe 3 is in a vertical state during use and drills downward to break rocks, and has a driving structure for driving the drill pipe 3 to rotate and drill downward; the slip ring 2 is sleeved and fixed on the circumference of the drill pipe 3, such as Figure 7As shown in the figure, the slip ring 2 is an electric slip ring for transmitting electrical signals, including a carbon brush 25 sleeved around the circumference of the drill pipe 3 and two limit members 24. The carbon brush 25 is located between the two limit members 24. The lower limit member 24 is fixed and in contact with the carbon brush 25, and the upper limit member 24 rotates with the drill pipe 3 to achieve 360° rotary conduction of the slip ring 2; the filter 4 is annular, sleeved around the circumference of the drill pipe 3, and located below the slip ring 2. The slip ring 2 is used to transmit electrical signals to the filter 4, and the filter 4 is used to filter the electrical signals transmitted by the slip ring 2. The filter 4 is a frequency selection device that can allow specific frequency components in the signal to pass through, while greatly attenuating or suppressing other frequency components. The filter 4 can transmit the specific signals transmitted by the slip ring 2 and filter out the remaining signals; the electromagnetic resonator 7 includes a housing 17, an elastic member, and an electromagnetic coil 15. The housing 17 has a cavity inside. The housing 17 is similar to a hollow cylinder. The cylindrical shape is convenient for installation and fixation, can form a stable support between the upper and lower parts of the overall device, ensure the correct positions of the internal components, and also help prevent the deposition of impurities in the cavity, reducing the workload of cleaning and maintenance. The housing 17 is made of insulating material. The housing 17 serves as a protective structure for the entire electromagnetic resonator 7. Its main function is to protect the electromagnetic resonator 7 to work stably under any conditions, especially in a magnetic field environment, while also avoiding internal electromagnetic leakage, improving the safety and working efficiency of the entire device. The housing 17 is arranged at the bottom end of the drill pipe 3. The elastic member and the electromagnetic coil 15 are both arranged in the cavity. The elastic member has two ends. One end of the elastic member is connected to the bottom end of the drill pipe 3, and the electromagnetic coil 15 is sleeved on the elastic member. The filter 4 transmits the filtered electrical signals to the electromagnetic coil 15. After receiving the electrical signals, the electromagnetic coil 15 generates an electromagnetic field. Among them, after receiving the electrical signals, the electromagnetic coil 15 generates an electromagnetic field, and the magnetic force direction of the magnetic field is vertical and consistent with the telescopic direction of the elastic member. The main function of the electromagnetic coil 15 is to generate a magnetic field attraction after passing through an electric current; the drill bit 8 is arranged at one end of the electromagnetic resonator 7 away from the drill pipe 3. The magnetic field attraction can assist the drill bit 8 in breaking rocks. When the natural frequency of rock breaking is consistent with the impact frequency excited by the electromagnetic resonance, the rock will resonate at this time. At this time, the vibration displacement of the rock is the largest and it is most likely to be damaged, thus achieving the purpose of resonance drilling. This device uses electromagnetic resonance impact. By using the electromagnetic resonator 7 to adjust the frequency and amplitude of the dynamic load, the resonance condition between the drill bit 8 and the formation is maintained under different drilling conditions to generate a stable and expanding fracture zone, so as to achieve the purpose of efficient rock breaking in hard rock formations.When the device is working, after being powered on first, the current is provided by the slip ring 2 and transmitted to the electromagnetic coil 15 via the filter 4. The electromagnetic coil 15 is powered on, and magnetic fields are generated at its two poles. The filter 4 also generates a fixed electrical frequency, which can affect the magnitude of the magnetic field attraction. The magnetic field attraction pulls the elastic member downward to stretch it. At the same time, the elastic force of the elastic member itself, the electromagnetic force of the magnetic field at the other pole, and the influence of the filter 4 on the magnitude of the magnetic field attraction work together. When a specific electrical frequency is reached, the magnetic field attraction becomes smaller, and the elastic member can be reset. The elastic member reciprocates between stretching and compressing, forming a telescopic frequency inherent to the device system itself. Before and during drilling, the filter 4 is always in operation. The current passes through the filter 4 to effectively filter out abnormal frequency components, ensuring a pure signal and screening out the effective excitation frequency band, enhancing the precise transmission of the impact energy, and forming a stable wave frequency. During drilling, when the drill bit 8 contacts the rock, the rock exerts an upward reaction force on the device, and the reaction force is transmitted to the elastic member to make it in a compressed state. Immediately afterwards, due to the filtering effect of the filter 4 on the electrical signal, when the electrical signal reaches a specific electrical frequency in the electromagnetic coil 15, the electromagnetic force field weakens, and the elastic member rebounds and returns to its original state due to the weakening of the external force, reaching a stretched state. At this time, the repeated working process forms an externally driven frequency. When the externally driven frequency is close to or equal to the frequency inherent to the device system itself, a vibration phenomenon with a sharp increase in amplitude occurs, thereby assisting the drill bit 8 in rock breaking, increasing the drilling rate. At the same time, the rock generates resonance, which can also enhance the stability of rock breaking.

[0023] This embodiment provides a specific structure of the elastic member. Further, as Figure 2 shown, the elastic member includes: a telescopic shaft 13, a spring 12, and a thrust ball bearing 14. The telescopic shaft 13 is vertically inserted into the cavity. The telescopic shaft 13 has the function of telescoping. The top end of the telescopic shaft 13 is detachably connected to the bottom end of the drill pipe 3, and the drill bit 8 is arranged at the bottom end of the telescopic shaft 13. An insulating tube 26 is sleeved on the telescopic shaft 13, and the electromagnetic coil 15 is sleeved on the insulating tube 26. Therefore, the magnetic force direction generated after the electromagnetic coil 15 is powered on is vertical and consistent with the axial direction of the telescopic shaft 13. The electromagnetic coil 15 is in circumferential contact with the telescopic shaft 13, facilitating the transmission of electromagnetic signals between the electromagnetic coil 15 and the telescopic shaft 13, as Figures 4 to 6As shown in the figure, the electromagnetic coil 15 is formed by winding a wire around an insulating tube 26 in circles. The wires are insulated from each other, and the insulating tube 26 is hollow. The electromagnetic coil 15 is a device that works based on the principle of electromagnetic induction. When an electric current flows through a wire, a certain electromagnetic field will be generated around this wire. And the wire itself in this electromagnetic field will have an inductive effect on the wires within the range of this electromagnetic field, that is, self-induction. The changing current generated by the wire itself generates a changing magnetic field, and this magnetic field further affects the current in the wire; the thrust ball bearing 14 is sleeved on the circumference of the telescopic shaft 13, and the bottom end of the thrust ball bearing 14 contacts the top end of the electromagnetic coil 15; the spring 12 is sleeved on the circumference of the telescopic shaft 13. Therefore, the telescopic direction of the spring 12 is also consistent with the axial direction of the telescopic shaft 13, that is, the telescopic direction of the spring 12 is consistent with the magnetic force direction generated by the electromagnetic coil 15. The top end of the spring 12 is fixed to the top inside the cavity, and the bottom end of the spring 12 is fixed to the top end of the thrust ball bearing 14. The thrust ball bearing 14 is designed to withstand thrust loads during high-speed operation and is composed of a washer-shaped raceway groove with ball rolling, and is composed of three parts: a seat ring, a shaft ring, and a steel ball cage. According to its force-bearing situation, a double-direction thrust ball bearing is used. This bearing is used to bear the axial load generated by the spring 12 and the electromagnetic coil 15 on it when the device impacts and breaks rocks, but does not bear radial loads at the same time, so as to support the rotation of the entire device, reduce the static friction coefficient during the movement process, and ensure the rotational accuracy of the device. When the inner diameter of the thrust ball bearing 14 is large enough, the model with the smallest outer diameter and thickness is selected to reduce the total length and volume of the device. According to the working principle of the above device, the elastic member reciprocally stretches and contracts under the magnetic field force and the reaction force during the drilling of the drill bit 8. That is, the spring 12 and the telescopic shaft 13 reciprocally stretch and contract together to form the impact frequency excited by electromagnetic resonance. When this impact frequency is the same as or close to the natural frequency of the rock when the drill bit 8 breaks the rock, the rock generates resonance for stable rock breaking.

[0024] As Figure 3As shown, further, the telescopic shaft 13 includes: a first shaft, a sleeve, and a second shaft 21. The spring 12 is sleeved on the circumference of the first shaft, and the top of the first shaft is detachably connected to the bottom end of the drill rod 3. The electromagnetic resonator 7 is installed at the bottom end of the drill rod 3 when working. The electromagnetic resonator 7 can be removed when not working or after work is completed. At this time, the drill bit 8 is installed at the bottom end of the drill rod 3 and can be used alone; multiple sleeves are sleeved in sequence head to tail, and the sleeve located at the top is arranged at the bottom end of the first shaft. The thrust ball bearing 14 and the insulating tube 26 are respectively sleeved on the circumference of multiple sleeves. The number of sleeves is set according to the actual working conditions. In this embodiment, there are three sleeves, namely the first sleeve 18, the second sleeve 19, and the third sleeve 20. The first sleeve 18 is arranged at the bottom end of the first shaft; the second sleeve 19 The top end of the third sleeve 20 is sleeved in the first sleeve 18, and the thrust ball bearing 14 is sleeved in the circumference of the first sleeve 18 and the second sleeve 19; the top end of the third sleeve 20 is sleeved in the second sleeve 19, and the insulating tube 26 and the electromagnetic coil 15 are sleeved in the circumference of the second sleeve 19 and the third sleeve 20; the second shaft 21 is passed through the bottom of the shell 17, the top end of the second shaft 21 is located in the cavity, and the bottom end of the second shaft 21 is located outside the shell 17, the drill bit 8 is fixed to the bottom end of the second shaft 21, and the top end of the second shaft 21 is sleeved in the third sleeve 20, and the first sleeve 18 and the second sleeve 19, the third sleeve 20 and the second sleeve 19, and the third sleeve 20 and the second shaft 21 are slidably connected by limiting structures. Figures 4 to 6 As shown, the electromagnetic coil 15 is composed of two small coils assembled together through a shell. When the electromagnetic coil 15 is energized, the two electromagnetic rings that are nested together generate an electromagnetic field at their two poles, that is, the two electromagnetic rings that are nested together generate a magnetic field vertically above and below. The three sleeves placed in the magnetic field are affected by the magnetic field attraction. In the initial state, the magnetic field traction force is downward, thereby pulling the three sleeves to move downward. When the sleeve moves downward and telescopes past the middle position of the electromagnetic coil 15, it will be attracted in the opposite direction. At this time, the magnetic field force is upward, and the sleeve reciprocates to telescope, thereby forming a frequency inherent to the device system itself. When breaking rocks, the continuous reaction force of the rock on the device forms a frequency driven by the outside, that is, the natural frequency of the rock. When the natural frequency of the rock is close to or equal to the natural frequency of the device system itself, a vibration phenomenon with a sharply increased amplitude is generated, thereby assisting the drill bit in breaking rocks and increasing the drilling rate.

[0025] Example 2 As a further improvement based on Embodiment 1, further, the top end of the spring 12 is fixed to the inner top of the cavity through a spring washer 9, and the spring washer 9 is sleeved and fixed on the circumference of the first shaft; the bottom end of the electromagnetic coil 15 located below abuts against the inner bottom of the cavity through a coil washer 16, and the coil washer 16 is sleeved and fixed on the circumference of the second shaft 21. In this embodiment, the spring washer 9 and the coil washer 16 are provided for anti-loosening. According to the size of the spring 12 and the national standard, the specification of the M16 type spring washer 9 is selected, and finally the fastener is tightened according to a certain torque value. When the fastener is tightened, the spring washer 9 will be compressed, providing the tension and pre-tightening force at the connection. The main purpose of the spring washer 9 is to provide tension and pre-tightening force in the connecting assembly, which helps to maintain the clamping force and prevent loosening or loss of tension due to vibration, thermal cycling or other factors. The spring washer 9 also helps to absorb shock and reduce the impact of cyclic loading on the connection, which can improve the durability and service life of the assembly. In addition, the spring washer 9 can be used to compensate for slight misalignment or adjust the tension of the connection without additional parts. The coil washer 16 is installed in contact with the inner bottom of the electromagnetic coil 15 at the bottom and the outer shell 17, and its main function is to increase the contact area, disperse the pressure on the outer shell 17 and the electromagnetic coil 15, and prevent the soft-textured electromagnetic coil 15 from being damaged.

[0026] Further, the detachable connection structure between the first shaft and the drill pipe 3 includes: a transfer shaft 5 and a pin 6. The transfer shaft 5 is vertically arranged at the bottom end of the drill pipe 3; the pin 6 is arranged at the bottom end of the transfer shaft 5. A through hole 10 is opened at the top of the first shaft, and the pin 6 is sleeved in the through hole 10, and the pin 6 is threadedly connected to the hole wall of the through hole 10. Among them, the threaded connection between the pin 6 and the through hole 10 adopts a spiral method with a large torque force. When the drill pipe 3 rotates, it will not drive the pin 6 to rotate relative to the through hole 10, but only make the pin 6 and the entire telescopic shaft 13 and other structures below rotate synchronously with the drill pipe 3.

[0027] Further, at least one air hole 11 is opened on the through hole 10, and the air hole 11 horizontally penetrates the first shaft. Opening the air hole 11 can realize the internal gas circulation, that is, an interference fit is adopted, so that the transfer shaft 5 can freely rotate in the through hole 10 to ensure the reliability of the connection. The interference fit with a small interference amount can transmit a relatively small force, and applying a larger force will cause the transfer shaft 5 and the through hole 10 to rotate. The assembly can be knocked with a wooden mallet for assembly.

[0028] Among them, the other structures of this embodiment are the same as those of Embodiment 1, only an optimization of Embodiment 1.

[0029] Embodiment 3 As a further improvement based on Embodiment 1, as Figure 3As shown in the figure, further, it also includes: a spring washer 22 and a spring washer fixing ring 23. The adapter shaft 5 includes two shaft bodies with different diameters. The diameter of the lower shaft body is smaller than that of the upper shaft body. The spring washer 22 is sleeved on the circumference of the lower shaft body. The spring washer 22 is used to ensure the stable connection between the adapter shaft 5 and the housing 17, reduce its looseness, and enable the normal operation of the machine. The spring washer fixing ring 23 is sleeved and fixed on the circumference of the spring washer 22. The top end of the spring washer fixing ring 23 is fixed to the bottom end of the upper shaft body. The spring washer fixing ring 23 can be used to fix the spring washer 22 to achieve a more stable connection.

[0030] Further, the outer diameter of the spring washer 22 is equal to the inner diameter of the thrust ball bearing 14. Since the spring washer 22 is sleeved on the telescopic shaft 13, and the inner diameter of the thrust ball bearing 14 is equal to the inner diameter of the telescopic shaft 13, when the bearing is pushed upward, the spring 12 can be effectively compressed. Therefore, the inner diameters of the spring washer 22 and the thrust ball bearing 14 are equal to meet the installation and working requirements. The outer diameter of the spring washer 22 is equal to the outer diameter of the thrust ball bearing 14, which can minimize the force exerted by the thrust ball bearing 14 on the spring washer 9 through the spring 12.

[0031] Among them, the other structures of this embodiment are the same as those of Embodiment 1, which is only an optimization of Embodiment 1.

[0032] Embodiment 4 As a further improved solution based on Embodiment 1, further, the drill pipe 3 is a screw rod, and it also includes: the bracket 1 is in an N shape. The drill pipe 3 passes through the top of the bracket 1, and the drill pipe 3 is threadedly connected to the bracket 1. The bracket 1 adopts a "gantry" structure, similar to a gantry crane. It can not only transmit power for the rotation and drilling of the drill pipe 3 by installing a motor, but also provide support for the stable drilling of the impact tool to bear the self-weight and working load of the drilling impact tool. The top of the drill pipe 3 is connected to the bracket 1, and the entire electromagnetic resonator 7 is suspended by the support of the gantry-shaped bracket 1 to achieve the purpose of vertical drilling and rock breaking. The two sides of the bracket 1 are designed in a "T" shape, so as to cope with the longitudinal vibration of the impact device when the resonance phenomenon occurs between the drill tool impact tool and the rock. The bracket 1 can play a good role in stability to ensure the accurate positioning when the drill bit breaks the rock. At the same time, a driving member is arranged on the bracket 1, and the output end of the driving member is connected to the top end of the drill pipe 3. The driving member is used to drive the drill pipe 3 to rotate. The driving member can be a motor, a servo or other rotary driving structures. In this embodiment, the driving member is a motor, and the output shaft of the motor is fixed to the top end of the drill pipe 3 to drive the drill pipe 3 to rotate.

[0033] Among them, the other structures of this embodiment are the same as those of Embodiment 1, which is only an optimization of Embodiment 1.

[0034] The advantages of the present invention are as follows. This device utilizes electromagnetic resonance impact. By using an electromagnetic resonator to adjust the frequency and amplitude of the dynamic load, the resonance condition between the drill bit and the formation is maintained under different drilling conditions to generate a steadily expanding fracture zone, thereby achieving the purpose of efficiently breaking hard rock formations. At the same time, the axial impact on the drill bit is reduced, and the service life of the drill bit is increased. During specific operation, when the electromagnetic coil is energized, magnetic fields are generated at both of its poles, and the filter also generates a fixed electrical frequency. This electrical frequency can affect the magnitude of the magnetic field attraction. The magnetic field attraction pulls the spring downward to stretch it. At the same time, under the combined action of the elastic force of the spring itself, the electromagnetic force of the magnetic field at the other pole, and the influence of the filter on the magnitude of the magnetic field attraction, when a specific electrical frequency is reached, the magnetic field attraction becomes smaller, which can also cause the spring to reset. The spring reciprocates in stretching and compressing, forming a telescopic frequency inherent to the device system itself. When this telescopic frequency is consistent with the inherent frequency of the broken rock, a vibration phenomenon with a sharply increased amplitude is generated, thereby assisting the drill bit in breaking rock, increasing the drilling rate. At the same time, when the rock resonates, the stability of rock breaking can also be enhanced.

[0035] The above-disclosed are only several specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto, and any changes that can be contemplated by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. An electromagnetic resonance impact tool, comprising: A drill pipe (3), characterized in that it further comprises: A slip ring (2), sleeved and fixed on the circumference of the drill pipe (3); A filter (4), sleeved and fixed on the circumference of the drill pipe (3), located below the slip ring (2); An electromagnetic resonator (7), comprising a housing (17), a telescopic shaft (13), a spring (12) and an electromagnetic coil (15). The housing (17) has a cavity inside. The housing (17) is arranged at the bottom end of the drill pipe (3). The telescopic shaft (13) is vertically arranged in the cavity. The top end of the telescopic shaft (13) is arranged at the bottom end of the drill pipe (3). The spring (12) and the electromagnetic coil (15) are both sleeved on the circumference of the telescopic shaft (13). The top end of the spring (12) is fixed to the inner top of the cavity, and the bottom end of the spring (12) abuts against the top of the electromagnetic coil (15). The filter (4) filters the electrical signal transmitted by the slip ring (2) and then transmits it to the electromagnetic coil (15). After receiving the electrical signal, the electromagnetic coil (15) generates an electromagnetic field; A drill bit (8), arranged at the bottom end of the telescopic shaft (13). Under the action of the electromagnetic field, the spring (12) drives the drill bit (8) to reciprocally expand and contract to form an impact frequency excited by electromagnetic resonance. When this impact frequency is consistent with the natural frequency of the rock when the drill bit (8) breaks the rock, the rock generates resonance for stable rock breaking.

2. The electromagnetic resonance impact tool according to claim 1, characterized in that, Two insulating tubes (26) are sleeved on the telescopic shaft (13), and the electromagnetic coils (15) are respectively sleeved on the two insulating tubes (26), and the electromagnetic coils (15) are in circumferential contact with the telescopic shaft (13).

3. An electromagnetic resonance impact tool according to claim 2, characterized in that, The telescopic shaft (13) comprises: A first shaft, on the circumference of which the spring (12) is sleeved. The top end of the first shaft is detachably connected to the bottom end of the drill pipe (3); A plurality of sleeves, sleeved in sequence from head to tail. The sleeve located at the uppermost part is arranged at the bottom end of the first shaft, and the insulating tube (26) is sleeved on the circumferences of the plurality of sleeves; A second shaft (21), passing through the bottom of the housing (17). The top end of the second shaft (21) is located inside the cavity, and the bottom end of the second shaft (21) is located outside the housing (17). The drill bit (8) is fixed to the bottom end of the second shaft (21). The top end of the second shaft (21) is sleeved inside the sleeve located at the lowermost part. Between adjacent two sleeves and between the second shaft (21) and the sleeve, they are all slidably connected through a limiting structure.

4. An electromagnetic resonance impact tool according to claim 3, characterized in that The top end of the spring (12) is fixed to the inner top of the cavity through a spring pad (9), and the spring pad (9) is sleeved and fixed on the circumference of the first shaft; the bottom end of the electromagnetic coil (15) abuts against the inner bottom of the cavity through a coil pad (16), and the coil pad (16) is sleeved and fixed on the circumference of the second shaft (21).

5. An electromagnetic resonance impact tool according to claim 3, characterized in that, The detachable connection structure between the first shaft and the drill pipe (3) comprises: An adapter shaft (5), vertically arranged at the bottom end of the drill pipe (3); A bolt (6) is provided at the bottom end of the adapter shaft (5). A through hole (10) is formed at the top of the first shaft. The bolt (6) is sleeved in the through hole (10), and the bolt (6) is threadedly connected to the hole wall of the through hole (10).

6. An electromagnetic resonance impact tool according to claim 5, characterized in that, At least one air hole (11) is formed in the through hole (10), and the air hole (11) horizontally penetrates the first shaft.

7. An electromagnetic resonance impact tool according to claim 5, characterized in that, A thrust ball bearing (14) is circumferentially sleeved on the sleeve. The bottom end of the spring (12) is fixed to the top end of the thrust ball bearing (14), and the bottom end of the thrust ball bearing (14) contacts the top end of the electromagnetic coil (15).

8. An electromagnetic resonance impact tool according to claim 7, characterized in that, Further comprising: A spring washer (22). The adapter shaft (5) comprises two shaft bodies with different diameters. The diameter of the lower shaft body is smaller than that of the upper shaft body. The spring washer (22) is sleeved on the circumference of the lower shaft body. A spring washer fixing ring (23) is sleeved and fixed on the circumference of the spring washer (22). The top end of the spring washer fixing ring (23) is fixed to the bottom end of the upper shaft body.

9. An electromagnetic resonance impact tool according to claim 8, characterized in that, The outer diameter of the spring washer (22) is equal to the inner diameter of the thrust ball bearing (14).

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