Magnetic type fast-rotating centrifugal slag-removing and hole-forming device and control method thereof

Abstract

The invention belongs to the technical field of coal seam pressure relief and permeability improvement, and relates to a magnetic type fast-rotating centrifugal deslagging and cave-making device which comprises a device body and a magnetic tool arm, the device body is of an integrated structure, a female connector is arranged at the rear end of the device body, a male connector is arranged at the front end of the device body, and a locking linkage groove and a liquid passing air channel are sequentially formed in the device body in the axial direction; the side wall is provided with a tool arm groove used for containing the magnetic suction tool arm. A locking linkage rod and a locking spring are installed in the locking linkage groove, one end of the locking spring abuts against the bottom of the locking linkage groove, and the other end of the locking spring pushes the locking linkage rod to axially move towards one end of the female connector. The middle of the locking linkage rod is provided with a conical tooth and a hole penetrating in the radial direction, and an annular channel communicating with the hole is formed in the locking linkage rod. One end of the magnetic suction cutter arm is hinged to the interior of the cutter arm groove, and a cutter arm gear meshed with the conical teeth is arranged at the end, hinged to the cutter arm groove, of the magnetic suction cutter arm; magnetic suction grooves are formed in the corresponding positions of the device body and the magnetic suction cutter arm, and annular magnets are fixed in the magnetic suction grooves.

Description

Technical Field

[0001] The invention belongs to the technical field of coal seam pressure relief and permeability enhancement, and relates to a magnetic suction type fast-rotation centrifugal slag removal and cavitation device and a control method thereof. Background Art

[0002] As my country's coal mining depth continues to increase at a rate of 10-25 meters per year, more than 40% of mines are deeper than 800 meters. Deep mining faces high geostress (generally 20-35MPa), low permeability (10 -4 ~10 -3 mD level), high gas pressure (2-5MPa), etc. The pressure relief range of the traditional 94-133mm diameter borehole can only cover the 0.5-1.2m area around the borehole, the pressure relief impact radius is small, and the gas disaster and rock burst control cycle is long. Especially for hard coal seams with a solidity coefficient f≥1.5, the degree of development of primary fissures is 60%-80% lower than that of medium-hard coal seams, and the conventional ordinary drilling pressure relief and permeability enhancement effect is not obvious, which seriously restricts the safety production efficiency of mines.

[0003] In the existing technology, hydraulic pressure relief technology mainly includes two categories: hydraulic cutting and hydraulic fracturing. The existing hydraulic cutting device uses a high-pressure water jet (35-50MPa) to cut the coal body to form a slot, but the single cutting depth in the hard coal seam with f≥2 is less than 0.3m, and the drill rod needs to be repeatedly advanced and retreated, resulting in an increase of more than 40% in working hours. Although the existing hydraulic fracturing technology can produce a crack extension of 5-15m, monitoring data show that about 32% of the cases have cracks penetrating the top and bottom plates, and the risk factor of inducing roof water inrush accidents is as high as 0.18. In addition, the random expansion of the fracture network results in an effective control rate of less than 65%, making it difficult to achieve directional permeability enhancement. In terms of mechanical hole expansion technology, the current main hole-making device is driven by an external power source (such as compressed air, compressed water, and hydraulic pressure). A typical example is the hydraulically controlled hole-reaming drill, which uses a hydraulic cylinder to push the cutter arm to expand. However, its hydraulic pipeline has a response delay of 3-5s when the hole depth exceeds 200m, which makes it difficult to open and close the cutter arm during drilling construction, resulting in a deviation of the cutter arm expansion angle of ±8°. Mechanical jamming is prone to occur in hard rock interlayers, and the drill may be damaged due to premature expansion of the cutter arm. Another pneumatic hole-reaming device uses compressed air to drive the cutter arm. Although it solves the problem of hydraulic delay, the closure failure rate caused by coal slag blocking the air path is as high as 15%, and the proportion of coal blocks with a particle size of >30mm produced by hole expansion exceeds 40%, resulting in a 35% increase in the risk of slag discharge system blockage.

[0004] It can be seen that the existing technology has the following common defects: (1) Power control mode limitation: the external hydraulic / pneumatic system is limited by the hole depth, and the control accuracy of the knife arm expansion and closing decreases exponentially with the increase of hole depth; (2) Coal slag interference problem: the cumulative amount of coal slag generated during the hole expansion process can reach 0.8-1.2m3 The existing device lacks active slag discharge structure design, which leads to mechanical lock caused by coal slag accumulation, affecting the recovery of drill rods and hole-making devices. Therefore, it is urgent to develop a controllable device to increase the borehole diameter, so as to increase the pressure relief and permeability enhancement range of the borehole, and improve the prevention and control effect of coal, rock gas and rock burst disasters. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a magnetic fast-rotating centrifugal slag removal and hole-making device and a control method thereof, which can accurately control the opening of the knife arm through the drill pipe rotation speed to solve the technical problems raised by the background technology.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A magnetic fast-rotation centrifugal slag removal and hole-making device, comprising a device body and a magnetic blade arm, wherein the device body is an integrated structure, a female interface is provided at the rear end, a male connector is provided at the front end, a locking linkage groove and a liquid-passing air channel are sequentially provided inside along the axial direction, and a blade arm groove for placing the magnetic blade arm is provided on the side wall;

[0008] A locking linkage rod and a locking spring are installed in the locking linkage groove, one end of the locking spring abuts against the bottom of the locking linkage groove, and the other end pushes the locking linkage rod to move axially toward one end of the female interface;

[0009] The locking linkage rod is provided with conical teeth and radially penetrating holes in the middle, and an annular passage communicating with the holes is provided inside the locking linkage rod;

[0010] One end of the magnetic blade arm is hinged in the blade arm slot, and one end of the magnetic blade arm hinged to the blade arm slot is provided with a blade arm gear meshing with the bevel gear;

[0011] Magnetic grooves are provided at positions corresponding to the device body and the magnetic blade arm, and an annular magnet is fixed in the magnetic groove.

[0012] Furthermore, both ends of the locking linkage rod are provided with grid rings for holes to be sealingly and slidingly connected with the locking linkage groove.

[0013] Furthermore, there are two blade arm slots which are symmetrically distributed on both sides of the device body.

[0014] Furthermore, the magnetic groove is located at one end of the magnetic knife arm away from the hinge point of the magnetic knife arm, and the magnetic knife arm and the device body are closed and fixed by the annular magnet.

[0015] Furthermore, a filter baffle is provided at both the female interface and the male joint, the outer side of the filter baffle is axially fixed by an elastic retaining ring, and the elastic retaining ring at the female interface cooperates with the filter baffle to limit the axial displacement of the locking linkage rod.

[0016] Furthermore, a channel hole is provided between the blade arm slot and the liquid-air passage to guide the high-pressure fluid to flow from the liquid-air passage into the blade arm slot for cleaning the coal slag.

[0017] Furthermore, the magnetic blade arm is hinged in the blade arm slot through a fixing pin.

[0018] A control method for a magnetic fast-rotation centrifugal slag removal and cavitation device, comprising:

[0019] The rotation speed of the device body makes the centrifugal force generated by the magnetic blade arm be F 离 The magnetic attraction force generated by the annular magnet of the device body and the annular magnet of the magnetic blade arm is F 磁 The minimum thrust generated by the locking spring on the locking linkage rod is F 弹min , control F 离 <F 磁 +F 弹min , so that the magnetic blade arm is in a closed rotation state;

[0020] The control device body rotates at a speed such that F 离 >F 磁 +F 弹max , so that the magnetic knife arm is expanded outward, and through the knife arm gear, the locking linkage rod and the locking spring are driven to be compressed and moved toward the male connector end, thereby making the magnetic knife arm in an open rotation state;

[0021] The control device body rotates at a speed such that F 离 <F 磁 +F 弹min The locking spring pushes the locking linkage rod to move toward the female interface (1-1), and drives the knife arm gear to rotate, thereby closing and resetting the magnetic knife arm.

[0022] Furthermore, the magnetic suction type fast-rotation centrifugal slag removal and hole-making device is installed on the drill rod through the female interface and the male connector, and the state of the magnetic suction knife arm is controlled by the drill rod rotation speed:

[0023] The speed during drilling is ≤100r / min, and the speed during hole making is ≥150r / min.

[0024] Furthermore, a passage hole is provided between the blade arm groove and the liquid and air passage;

[0025] A high-pressure fluid is introduced into the drill pipe, and the high-pressure fluid flows through the female interface, the annular passage, the locking linkage groove, the liquid and gas passage and the male joint in sequence, and is ejected from the eyelet and the channel hole to clean the coal slag.

[0026] The beneficial effects of the present invention are:

[0027] The present invention proposes a magnetic fast-rotation centrifugal slag removal and hole-making device, the core of which is to achieve precise control of the knife arm and effective cleaning of coal slag through innovative magnetic attraction and fast-rotation centrifugal mechanisms, thereby significantly improving the effect of drilling pressure relief and permeability enhancement.

[0028] The innovation of this technical solution is mainly reflected in three aspects. First, the device body adopts an integrated structure, which enhances the structural strength and ensures the stability of the device in the complex environment of deep mines. Secondly, through the ingenious design of the magnetic suction and locking structure, it ensures that the cutter arm is always in a closed state during the drilling process, improving the safety of the operation. Most importantly, a fast-rotating centrifugal cutter arm opening method was invented. Without the use of external force, the cutter arm can be quickly opened by adjusting the drill pipe speed, greatly improving the operation efficiency.

[0029] The practicability of this technical solution is also significant. On the one hand, the device realizes the instant cleaning of coal slag during the cavitation process through the built-in channel holes and holes in combination with high-pressure fluid, effectively preventing the influence of coal slag blockage on the opening and closing of the knife arm, and ensuring the continuous and stable operation of the device. On the other hand, the device simplifies the structure of the traditional hydraulic or hydraulic propulsion cavitation device, reduces the manufacturing cost and maintenance difficulty, and improves the reliability and durability of the device. Therefore, the present invention has a high on-site promotion value and is of great significance for improving the safety and efficiency of coal mining.

[0030] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0032] Figure 1 It is a structural schematic diagram of a magnetic fast-rotation centrifugal slag removal and cavitation device in the embodiment;

[0033] Figure 2 Schematic diagram of the structure of the locking linkage rod in the embodiment;

[0034] Figure 3 It is a schematic diagram of the development of a magnetic fast-rotation centrifugal slag removal and cavitation device in the embodiment.

[0035] Figure markings: 1-device body, 2-magnetic blade arm, 3-cover plate, 1-1-female interface, 1-2-locking linkage groove, 1-3-liquid and air passage, 1-4-locking spring, 1-5-locking linkage rod, 1-5-a-grid ring for hole, 1-5-b-conical tooth, 1-5-c-eyelet, 1-5-d-annular channel, 1-6-blade arm groove, 1-7-gear groove, 1-8-fixing pin, 1-9-channel hole, 1-10-magnetic groove, 1-11-annular magnet, 1-12-rivet, 1-13-male connector, 1-14-filter baffle, 1-15-elastic retaining ring, 2-1-blade arm gear, 2-2-blade arm eyelet. DETAILED DESCRIPTION

[0036] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0037] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0038] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing 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 operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0039] See also Figure 1 to Figure 3 It is a magnetic fast-rotating centrifugal slag removal and hole-making device. The magnetic knife arm is used to quickly rotate with the drill rod in the coal seam borehole to open the hole and increase the borehole diameter. At the same time, it can realize the coal slag cleaning function to prevent coal slag from entering the hole-making structure, affecting the closure of the magnetic knife arm and causing wear of the hole-making device.

[0040] The device includes a device body 1 and a magnetic knife arm 2. The device body 1 is a hollow rod body with an integrated structure. A female interface 1-1 is provided at the rear end, a male connector 1-13 is provided at the front end, a locking linkage groove 1-2 and a liquid and air passage 1-3 are sequentially arranged along the axial direction inside, and a knife arm groove 1-6 is provided on the side wall, and the knife arm groove 1-6 is connected to the locking linkage groove 1-2.

[0041] A locking linkage rod 1-5 and a locking spring 1-4 are sequentially installed in the locking linkage groove 1-2 along the axial direction, and one end of the locking spring 1-4 away from the locking linkage rod 1-5 contacts the bottom of the locking linkage groove 1-2, so that the locking spring 1-4 generates a thrust force on the locking linkage rod 1-5 away from the locking spring 1-4;

[0042] Wherein, both ends of the locking linkage rod 1-5 are provided with hole-use grid rings 1-5-a to form a sealed sliding connection with the locking linkage groove 1-2, and the middle part of the locking linkage rod 1-5 is provided with axially arranged conical teeth 1-5-b and a plurality of radially penetrating holes 1-5-c of the locking linkage rod 1-5, and the locking linkage rod 1-5 has an axially arranged annular channel 1-5-d which is connected with the hole 1-5-c.

[0043] Specifically, there are 4 conical teeth 1-5-b, and the holes 1-5-c are arranged at the top of the conical teeth 1-5-b and the middle part of the adjacent conical teeth 1-5-b, specifically 9 in number, and the diameter of the holes is 2mm; two grooves are respectively arranged at both ends of the locking linkage rod 1-5, and correspondingly there are grid rings 1-5-a for the holes.

[0044] There are two knife arm slots 1-6, which are symmetrically arranged on the device body 1, one end of the magnetic knife arm 2 is provided with a knife arm hole 2-2, and is hinged in the knife arm slot 1-6 by a fixing pin 1-8 penetrating the knife arm hole 2-2, and the end of the magnetic knife arm 2 hinged to the knife arm slot 1-6 is provided with a knife arm gear 2-1 meshing with the conical tooth 1-5-b, so that when the magnetic knife arm 2 is rotated and unfolded, the locking linkage rod 1-5 is driven to make axial movement through the knife arm gear 2-1.

[0045] Magnetic grooves 1-10 are provided at corresponding positions of the device body 1 and the magnetic knife arm 2, and an annular magnet 1-11 fixed by a rivet 1-12 is arranged in the magnetic knife arm 1-10, so that the magnetic knife arm 2 is fixed to the device body 1 by magnetic attraction without being subjected to force. Specifically, in this embodiment, the magnetic groove 1-10 is arranged at one end of the magnetic knife arm 2 away from the fixing pin 1-8 to maximize the magnetic attraction force.

[0046] Furthermore, symmetrically distributed channel holes 1-9 are provided between the blade arm slot 1-6 and the liquid and air passage 1-3. The aperture of the channel holes 1-9 is 4 mm, and is used for high-pressure fluid to flow from the liquid and air passage 1-3 into the blade arm slot 1-6 to remove coal slag.

[0047] Furthermore, a filter baffle 1-14 is provided at both the female interface 1-1 and the male connector 1-13, and an elastic retaining ring 1-15 is provided on the side of the filter baffle 1-14 away from the device body 1 to axially fix the filter baffle 1-14; and the elastic retaining ring 1-15 at the female connector 1-1 cooperates with the filter baffle 1-14 to limit the axial displacement of the locking linkage rod 1-5.

[0048] Furthermore, a cover plate 3 arranged at the fixing pins 1 - 8 is provided on the device body 1 to prevent coal slag from entering the connection between the fixing pins 1 - 8 and the device body 1 .

[0049] For details, please refer to Figure 1 The assembly sequence of the magnetic fast-rotation centrifugal slag removal and cavitation device is as follows:

[0050] First, the locking spring 1-4 and the locking linkage rod 1-5 are sequentially placed in the locking linkage groove 1-2, and then the filter baffle 1-14 and the elastic retaining ring 1-15 are installed at the front end of the female interface 1-1; the locking spring 1-4 and the locking linkage rod 1-5 cooperate with the filter baffle 1-14 and the elastic retaining ring 1-15 at the front end of the female interface 1-1 to form a locking linkage mechanism;

[0051] Then, the magnetic knife arm 2 is placed in the knife arm slot 1-6, and the knife arm gear 2-1 is matched and meshed with the conical tooth 1-5-b, and then the fixing pin 1-8 is passed through the knife arm hole 2-2 to hinge the magnetic knife arm 2 in the knife arm slot 1-6;

[0052] Then, an annular magnet 1-11 is installed in the magnetic blade arm 2 and the magnetic groove 1-10 in the blade arm groove 1-6 respectively, and fixed with a rivet 1-12;

[0053] Finally, the filter baffle 1-14 and the elastic retaining ring 1-15 are installed in sequence at the front end of the male connector 1-13.

[0054] See also Figure 3 , is the working state of the magnetic fast-rotating centrifugal slag removal and hole-forming device, and the control method of the magnetic fast-rotating centrifugal slag removal and hole-forming device is as follows:

[0055] The rotation speed of the device body 1 causes the centrifugal force generated by the magnetic blade arm 2 to be F 离 The magnetic attraction force generated by the annular magnet of the device body 1 and the annular magnet of the magnetic blade arm is F 磁The minimum thrust generated by the locking spring 1-4 on the locking linkage rod 1-5 is F 弹min , control F 离 <F 磁 +F 弹min , so that the magnetic blade arm 2 is in a closed rotation state;

[0056] The control device body 1 rotates at a speed that causes the magnetic blade arm 2 to generate a centrifugal force F 离 , greater than the magnetic attraction F of the ring magnet 1-11 磁 Maximum thrust F with locking spring 1-4 弹max , that is, F 离 >F 磁 +F 弹max , so that the magnetic knife arm 2 is expanded outward, and through the knife arm gear 2-1, the locking spring 1-4 and the locking linkage rod 1-5 are compressed and moved toward the end of the male connector 1-13, and finally the magnetic knife arm 2 is in an open rotation state;

[0057] The control device body 1 rotates at a speed such that F 离 <F 磁 +F 弹min The locking spring 1-4 pushes the locking linkage rod 1-5 to move toward the female interface 1-1, and drives the knife arm gear 2-1 to rotate, thereby closing and resetting the magnetic knife arm, and fixing it with the device body through magnetic attraction.

[0058] Furthermore, the magnetic fast-rotation centrifugal slag removal and hole-making device is installed on the drill rod through the female interface 1-1 and the male connector 1-13, and the state of the magnetic blade arm 2 is controlled by the rotation speed of the drill rod.

[0059] When drilling normally, control the rotation speed of the drill rod to ≤100r / min so that F 离 <F 磁 +F 弹min , so that the magnetic blade arm 2 is in a closed state; when drilling is required, the rotation speed of the drill rod is controlled to be ≥150r / min, so that F 离 >F 磁 +F 弹max , thereby causing the magnetic blade arm 2 to expand outward and move forward to perform rotational acupuncture.

[0060] Furthermore, when drilling holes, high-pressure air or high-pressure water is introduced into the drill pipe. When the high-pressure air or high-pressure water flows out through the female interface 1-1, the annular channel 1-5-d, the locking linkage groove 1-2, the liquid and air channel 1-3 and the male connector 1-13, it flows out through the hole 1-5-c and the channel hole 1-9 respectively to clean the coal slag at the blade arm gear 2-1 and the blade arm groove 1-6.

[0061] Example 2

[0062] The difference between this embodiment and embodiment 1 is that the magnetic knife arms 2 can be set to 3 or 4. When the magnetic knife arms 2 are 3, the magnetic knife arms 2 are evenly arranged at intervals of 120° on the device body 1; when the magnetic knife arms 2 are 4, the magnetic knife arms 2 are evenly arranged at intervals of 90° on the device body 1 to ensure that the magnetic knife arms 2 are evenly stressed on the device body.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A magnetic fast-rotation centrifugal slag removal and hole-making device, characterized in that: The device comprises a device body (1) and a magnetic knife arm (2), wherein the device body (1) is an integrated structure, a female interface (1-1) is provided at the rear end, a male connector (1-13) is provided at the front end, a locking linkage groove (1-2) and a liquid and air passage (1-3) are sequentially provided inside along the axial direction, and a knife arm groove (1-6) for accommodating the magnetic knife arm (2) is provided on the side wall; A locking linkage rod (1-5) and a locking spring (1-4) are installed in the locking linkage groove (1-2); one end of the locking spring (1-4) abuts against the bottom of the locking linkage groove (1-2), and the other end pushes the locking linkage rod (1-5) to move axially toward one end of the female interface (1-1); The locking linkage rod (1-5) is provided with a conical tooth (1-5-b) and a radially penetrating hole (1-5-c) in the middle thereof, and an annular passage (1-5-d) communicating with the hole (1-5-c) is provided inside the locking linkage rod (1-5); One end of the magnetic blade arm (2) is hinged in the blade arm slot (1-6), and the end hinged to the blade arm slot (1-6) is provided with a blade arm gear (2-1) meshing with the conical gear (1-5-b); Magnetic suction grooves (1-10) are provided at corresponding positions of the device body (1) and the magnetic suction knife arm (2), and an annular magnet (1-11) is fixed in the magnetic suction groove (1-10).

2. The device according to claim 1, characterized in that: Both ends of the locking linkage rod (1-5) are provided with hole grid rings (1-5-a) to be sealed and slidably connected with the locking linkage groove (1-2).

3. The device according to claim 1, characterized in that: There are two blade arm slots (1-6) which are symmetrically distributed on both sides of the device body (1).

4. The device according to claim 1, characterized in that: The magnetic suction groove (1-10) is located at one end of the magnetic suction knife arm (2) away from the hinge point of the magnetic suction knife arm (2), and the magnetic suction knife arm (2) and the device body (1) are closed and fixed by the annular magnet (1-11).

5. The device according to claim 1, characterized in that: A filter baffle (1-14) is provided at both the female interface (1-1) and the male connector (1-13); the outer side of the filter baffle (1-14) is axially fixed by an elastic retaining ring (1-15); and the elastic retaining ring (1-15) at the female interface (1-1) cooperates with the filter baffle (1-14) to limit the axial displacement of the locking linkage rod (1-5).

6. The device according to claim 1, characterized in that: A channel hole (1-9) is provided between the blade arm slot (1-6) and the liquid and air passage (1-3) to guide high-pressure fluid from the liquid and air passage (1-3) into the blade arm slot (1-6) for cleaning coal slag.

7. The device according to claim 1, characterized in that: The magnetic blade arm (2) is hinged in the blade arm slot (1-6) via a fixing pin (1-8).

8. A control method for a magnetic fast-rotation centrifugal slag removal and hole-forming device, characterized in that: Used to control the magnetic fast-rotation centrifugal slag removal and cavitation device described in any one of claims 1 to 7, the control method comprises: The rotation speed of the device body (1) causes the centrifugal force generated by the magnetic blade arm (2) to be F 离 The magnetic attraction force generated by the annular magnet of the device body (1) and the annular magnet of the magnetic blade arm (2) is F 磁 The minimum thrust generated by the locking spring (1-4) on the locking linkage rod (1-5) is F 弹min , control F 离 <F 磁 +F 弹min , so that the magnetic blade arm (2) is in a closed rotation state; The control device body (1) rotates at a speed such that F 离 >F 磁 +F 弹max , causing the magnetic knife arm (2) to expand outward, and through the knife arm gear (2-1), driving the locking linkage rod (1-5) and the locking spring (1-4) to be compressed and moved toward the end of the male connector (1-13), thereby placing the magnetic knife arm (2) in an open rotation state; The control device body (1) rotates at a speed such that F 离 <F 磁 +F 弹min The locking spring (1-4) pushes the locking linkage rod (1-5) to move toward the female interface (1-1), and drives the knife arm gear (2-1) to rotate, thereby closing and resetting the magnetic knife arm.

9. The control method according to claim 8, characterized in that: The magnetic suction type fast-rotation centrifugal slag removal and hole-making device is installed on the drill rod through the female interface (1-1) and the male connector (1-13), and the state of the magnetic suction knife arm (2) is controlled by the drill rod rotation speed: The speed during drilling is ≤100r / min, and the speed during hole making is ≥150r / min.

10. The control method according to claim 9, characterized in that: A channel hole (1-9) is provided between the blade arm groove (1-6) and the liquid and air passage (1-3); A high-pressure fluid is introduced into the drill pipe, and the high-pressure fluid flows through the female interface (1-1), the annular passage (1-5-d), the locking linkage groove (1-2), the liquid and gas passage (1-3) and the male connector (1-13) in sequence, and is ejected from the eyelet (1-5-c) and the passage hole (1-9) to clean the coal slag.

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