Fractured drill rod taking-out device

Abstract

The invention relates to the technical field of mine drilling, and discloses a fractured drill rod taking-out device which comprises a guide rod and a drill rod body, the outer diameter of the guide rod is smaller than the inner diameter of the drill rod body, the end, close to the drill rod body, of the guide rod is arranged to be in an arc shape, and the fractured drill rod taking-out device further comprises a positioning assembly used for clamping the inner wall of a fractured drill rod. The positioning assembly is arranged on the surface of the guide rod and comprises a plurality of movable plates hinged to the surface of the guide rod, a rotating shaft is rotationally connected to the axis position in the guide rod, right-hand threads are formed in the surface of the rotating shaft, push blocks are arranged on the sides, close to the interior of the guide rod, of the movable plates, and the push blocks are connected with the movable plates through connecting blocks; a moving block is arranged in the push block, and a plurality of balls are movably connected to the bottom of the moving block. The outer diameter of the guide rod is reduced, the guide rod is eccentrically inserted into the fractured drill rod, the outer expanding movable plate is matched to tightly clamp the inner wall of the fractured drill rod, and the fractured drill rod taking-out efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of mine drilling, in particular to a device for removing a broken drill rod. Background Art

[0002] In underground drilling operations in coal mines, the drill rod, as the core component connecting the drilling rig and the drill bit, plays a key role in transmitting power, transporting mud and removing rock cuttings during drilling operations.

[0003] Affected by complex geological conditions, such as the collapse and squeezing of broken rock strata, the shrinkage of the borehole caused by high ground stress, and the fatigue accumulation caused by alternating loads, the drill pipe faces a high risk of fracture during the drilling process. Once fracture occurs, the broken drill pipe will remain in the hole, which will not only cause the drilling hole to be scrapped, but may also cause safety hazards such as gas leakage and water inrush, and it needs to be salvaged.

[0004] In the prior art, slip salvage tools are often used to salvage broken drill pipes in holes. The tools bite the drill pipe body by inserting an outer sleeve or an inner sleeve to achieve recovery. However, in actual working conditions, the broken end faces of drill pipes often present irregular shapes due to impact loads or corrosion. Some fracture surfaces even abnormally invade foreign objects such as bolt fragments and rock chips due to rock squeezing and mud scouring in the borehole, resulting in uneven cross-sections or local protrusions at the fracture site. In such cases, the slip teeth of the slip salvage tool are difficult to cut smoothly along the outer or inner wall of the drill pipe, resulting in insufficient biting force of the salvage tool, which to a certain extent aggravates the difficulty of accident handling. Summary of the Invention

[0005] The purpose of the present invention is to provide a broken drill rod removal device to solve the problems raised by the above background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a broken drill rod removal device, comprising a guide rod and a drill rod body, wherein the outer diameter of the guide rod is smaller than the inner diameter of the drill rod body, and the end of the guide rod close to the drill rod body is configured in an arc shape; It also includes a positioning assembly for biting the inner wall of the broken drill rod, which is arranged on the surface of the guide rod, and the positioning assembly includes a plurality of movable plates hinged on the surface of the guide rod, the inner axis position of the guide rod is rotatably connected to a rotating shaft, the surface of the rotating shaft is provided with a positive thread, and the movable plate is provided with a push block on the side close to the inner side of the guide rod, the push block is connected to the movable plate through a connecting block, and a moving block is provided in the push block, and a plurality of balls are movably connected to the bottom of the moving block, and the balls are embedded in the positive thread groove; The utility model also comprises an adjusting component for disengaging the ball from the positive thread groove to locate the position of the movable plate.

[0007] Preferably, the adjustment assembly includes a contact plate, which is arranged on the surface of the movable plate and away from the hinge point between the movable plate and the guide rod. The contact plate is connected to the movable plate through a plurality of pressure-sensitive switches. The movable block slides in the push block, and the movable block is configured to have a ferromagnetic material. An electromagnet adapted to the movable block is fixedly connected to the top of the push block, and the electromagnet is electrically connected to the pressure-sensitive switch. It also includes a fixing component for positioning the rotation angle of the movable plate.

[0008] Preferably, a plurality of anti-slip grooves are provided on the surface of the contact plate.

[0009] Preferably, the fixed component includes abutment blocks fixedly connected to both sides of the moving block, and there are sliding blocks in the push block near both sides of the moving block, the clamping blocks abut against the abutment blocks, and the inner wall of the guide rod is provided with a sliding groove for the push block to slide, and a rack is provided along the inner wall of the sliding groove, and one end of the clamping block is provided with a tooth groove adapted to the rack.

[0010] Preferably, the clamping block is connected to the pushing block via a tension spring.

[0011] Preferably, a sleeve is sleeved on the surface of the guide rod, the inner diameter of the sleeve is larger than the outer diameter of the drill rod body, and one end of the guide rod away from the drill rod body is connected to the sleeve.

[0012] Preferably, a movable groove is provided on the surface of the guide rod, and a push plate slides through the movable groove, a reverse thread adapted to the push plate is provided on the surface of the rotating shaft, a receiving ring is slid on the inner wall of the sleeve, and a plurality of inclined blocks are fixedly connected to the end of the receiving ring away from the push plate, and a clamping block is provided on the end of the inner wall of the sleeve close to the drill rod body, and one end of the inclined block is inserted between the clamping block and the inner wall of the sleeve.

[0013] Preferably, the inner diameter of the receiving ring is larger than the outer diameter of the guide rod.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention reduces the outer diameter of the guide rod instead of completely fitting the size of the inner wall of the drill rod, so that it can avoid the abnormal intrusion of the broken drill rod, and thus be eccentrically inserted into the broken drill rod. The outward-expanding movable plate tightly clamps the inner wall of the broken drill rod, thereby improving the applicability of removing the broken drill rod.

[0015] 2. The present invention adjusts the setting of the assembly so that the guide rod eccentrically inserted into the broken drill rod can rotate and unfold at different angles for each movable plate, so that the guide rod can be pressed against the inner wall of the broken drill rod through the movable plate even when it is not directly facing the axis, thereby improving the stability of removing the drill rod.

[0016] 3. The present invention assists in inserting the inner wall of the guide rod into the broken drill rod and biting it tightly through the setting of the sleeve. The sleeve clamps the outer wall of the broken drill rod from the outside through the clamping block on its inner wall. Since the inner diameter of the sleeve is larger than the outer diameter of the drill rod, the clamping block can also adjust the offset position of the sleeve accordingly when clamping, so that the sleeve can also eccentrically clamp the drill rod, biting the broken drill rod inside and outside, achieving a more secure clamping and improving the stability of removing the broken drill rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the present invention for illustrating the state in which the guide rod is offset and inserted into the drill rod body; Figure 3 This is a cross-sectional view of the present invention for illustrating the internal structure of the guide rod; Figure 4 This is a front cross-sectional view of the present invention for illustrating the entire device; Figure 5 For the present invention Figure 4 A magnified view of point A in the figure; Figure 6 This is a cross-sectional view of the push block used to illustrate the present invention.

[0018] In the figure: 1. Guide rod; 11. Sleeve; 12. Drill rod body; 2. Movable plate; 21. Contact plate; 211. Pressure switch; 22. Push block; 221. Connecting block; 23. Moving block; 231. Ball; 232. Electromagnet; 24. Abutment block; 241. Card block; 242. Rack; 243. Tension spring; 3. Rotating shaft; 31. Positive thread; 32. Negative thread; 4. Push plate; 41. Adapter ring; 42. Bevel block; 43. Clamping block. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] The embodiment of the present invention discloses a broken drill rod removal device, such as Figures 1-6As shown, it includes a guide rod 1 and a drill rod body 12. The outer diameter of the guide rod 1 is smaller than the inner diameter of the drill rod body 12. Specifically, the diameter of the guide rod 1 can be determined according to the inner wall diameter of the broken drill rod body 12 that needs to be removed, so that the guide rod 1 can pass through the abnormal intrusion obstacle position on the surface of the drill rod body 12 and be smoothly inserted into the broken drill rod body 12. The end of the guide rod 1 close to the drill rod body 12 is set to an arc shape. The setting of the arc-shaped guide rod 1 makes it easy for the guide rod 1 to slide away smoothly when it contacts an obstacle on the surface of the drill rod body 12, avoid the obstacle, and enter the interior of the drill rod body 12.

[0021] The present invention also includes a positioning assembly for biting the inner wall of the broken drill rod, which is arranged on the surface of the guide rod 1. The positioning assembly includes a plurality of movable plates 2 hinged on the surface of the guide rod 1. The movable plates 2 are arranged near the arc-shaped end of the guide rod 1 and are circumferentially arranged around the guide rod 1. The specific number of movable plates is determined according to factors such as the size and weight of the broken drill rod to be removed. It should be set to at least three, and the circumferential spacing should be equal. The internal axis position of the guide rod 1 is rotatably connected to the rotating shaft 3, and the surface of the rotating shaft 3 is provided with a positive thread 31. The movable plate 2 is provided with a push block 22 on the side close to the inside of the guide rod 1, and the push block 22 is connected to the guide rod 1 through the connecting block 221. Connected to the movable plate 2, the connecting block 221 is fixedly connected to the pushing block 22 and slides in the oblique groove opened at the bottom of the movable plate 2. Under normal conditions, the pushing block 22 is at the arc end position closest to the guide rod 1. When the pushing block 22 moves toward the arc end position away from the guide rod 1, the connecting block 221 slides in the oblique groove, pushing the movable plate 2 to rotate and expand outward. A moving block 23 is provided in the pushing block 22, and a plurality of balls 231 are movably connected to the bottom of the moving block 23. The balls 231 are embedded in the grooves of the positive thread 31, and also include an adjustment component for disengaging the balls 231 from the grooves of the positive thread 31 to position the movable plate 2.

[0022] Specifically, since the movable block 23 is connected to the positive thread 31 groove through a plurality of balls 231, and the movable block 23 is limited by the push block 22 and can only move along the axial position of the rotating shaft 3, when the rotating shaft 3 rotates, the positive thread 31 groove spirally rotates, so that the balls 231 in the groove drive the movable block 23 to move axially, and further drive the push block 22 to move laterally, causing the surface connecting block 221 of the push block 22 to slide in the slide groove, pushing the movable plate 2 outward, and one end of the movable plate 2 expands in the direction away from the guide rod 1, thereby expanding the outer diameter of the guide rod 1, making it easier for the end of the guide rod 1 inserted into the broken drill rod to expand outward, thereby contacting and pressing against the inner wall of the drill rod, providing a stable biting force for the subsequent removal of the drill rod.

[0023] Further, due to the obstruction of the broken drill rod surface foreign matter invasion position, the guide rod 1 is not inserted into the broken drill rod concentrically, so that the eccentric guide rod 1 makes the several movable plates 2 have different outreach distances, the movable plate 2 at the position closer to the inner wall of the broken drill rod has a small outreach distance, and the movable plate 2 at the position farther away from the inner wall of the broken drill rod needs a larger outreach distance to contact and abut to the inner wall of the broken drill rod, so that after the outreach of the movable plate 2 is temporarily stopped by adjusting the assembly and detaching the contact between the ball 231 and the groove of the positive screw 31, the shaft 3 can still continue to rotate, driving the movable plate 2 which needs to continue to outreach to continue to rotate, improving the individual independence and controllability of each movable plate 2, and also realizing more stable and controllable clamping operation in the eccentric state of the guide rod 1.

[0024] Wherein, as shown in Figure 3 , Figure 4 and Figure 5 , in the embodiment, the adjusting assembly comprises a contact plate 21, the contact plate 21 is arranged on the surface of the movable plate 2, the contact plate 21 covers the surface of the movable plate 2 as a whole, and is away from the hinged point position of the movable plate 2 and the guide rod 1, so that in the process of the outward expansion of the movable plate 2, the contact plate 21 will first contact the inner wall of the drill rod body 12, the contact plate 21 is connected with the movable plate 2 through a plurality of pressure switches 211, when the movable plate 2 is expanded and the contact plate 21 contacts the inner wall of the drill rod body 12, the pressure switch 211 is pressed by the reaction force of the inner wall of the drill rod, a pressure current is generated, the moving block 23 slides in the push block 22, and the moving block 23 is arranged to be made of ferromagnetic material, such as iron block, ferromagnetic alloy block, etc., or only an iron block or a ferromagnetic alloy block is arranged on the top of the moving block 23, and the moving block 23 is mainly made of light material, such as aluminum alloy, stainless steel, etc., so as to reduce the overall weight of the moving block 23, the electromagnetic iron 232 which is matched with the moving block 23 is fixedly connected to the top of the push block 22, the electromagnetic iron 232 is electrically connected with the pressure switch 211, and the adjusting assembly further comprises a fixing assembly for positioning the rotation angle of the movable plate 2.

[0025] Specifically, when the movable plate 2 is unfolded and its surface contact plate 21 is pressed against the inner wall of the drill rod body 12, under the action of the external expansion force of the continuous unfolding of the movable plate 2, the reaction force exerted by the inner wall of the drill rod body 12 on the contact plate 21 causes the pressure-sensitive switch 211 to generate a pressure-sensitive current. A certain vertical pressing pressure threshold can be set for the pressure-sensitive switch 211. When the pressure threshold is reached, the pressure-sensitive switch 211 transmits an opening and closing signal to the electromagnet 232. The electromagnet 232 is provided with a controller. The opening and closing signal received by the controller causes the direction of the magnetic field of the electromagnet 232 to change, thereby generating a magnetic attraction, thereby sucking the moving block 23 below it upward. In this process, the moving block The ball 231 at the bottom of 23 disengages from the thread groove on the surface of the positive thread 31, canceling the movement of the positive thread 31 groove on the push block 22 when the shaft 3 rotates. At this time, the movable plate 2 is in a stopped expansion state, and the shaft 3 can continue to rotate, driving other movable plates 2 to continue to expand outward to adapt to the eccentric state of the guide rod 1. At the same time, when the movable plate 2 stops expanding, the fixed assembly can timely position the movable plate 2 so that it maintains the pressing force against the inner wall of the drill rod body 12. Correspondingly, after the broken drill rod is removed, the magnetic field of the electromagnet 232 is reversed to generate a downward repulsive force, thereby pushing the movable block 23 down to return the movable plate 2 to the center, and it can continue to be reused.

[0026] Furthermore, a plurality of anti-slip grooves are provided on the surface of the contact plate 21. By providing the anti-slip grooves, the friction between the contact plate 21 and the inner wall of the drill rod body 12 is increased, thereby improving the biting force. In addition, the surface shape and material of the contact plate 21 can be selected to adapt to the inner wall according to the roughness of the inner wall material of different broken drill rods.

[0027] Furthermore, in this embodiment, if Figure 5 and Figure 6 As shown, the fixed assembly includes abutment blocks 24 fixedly connected to both sides of the moving block 23, and there are sliding blocks 241 in the push block 22 near both sides of the moving block 23, and the block 241 abuts against the abutment blocks 24, and the inner wall of the guide rod 1 is provided with a sliding groove for the push block 22 to slide, and a rack 242 is provided along the inner wall of the sliding groove, and one end of the block 241 is provided with a tooth groove adapted to the rack 242, and the block 241 is connected to the push block 22 through a tension spring 243, and the two ends of the tension spring 243 are fixedly connected to the block 241 and the push block 22 respectively. When the tension spring 243 is in a relaxed state, the block 241 does not contact and engage with the rack 242.

[0028] Specifically, when the moving block 23 is attracted by the electromagnet 232 and moves upward, the ball 231 is disengaged from the positive thread 31, and accordingly, the abutment block 24 also moves upward synchronously, pushing the clamping block 241 to move toward the direction close to the rack 242. The movement of the clamping block 241 stretches the tension spring 243. In the process of the moving block 23 continuing to move upward and being completely attracted by the electromagnet 232, the clamping block 241 is pushed outward to be pressed against the surface of the rack 242. The engagement and clamping of the tooth groove on the surface of the clamping block 241 and the rack 242 fixes the position of the entire push block 22, thereby positioning the outward angle of the movable plate 2.

[0029] like Figure 3 and Figure 4 As shown, the surface of the guide rod 1 is covered with a sleeve 11, the inner diameter of the sleeve 11 is larger than the outer diameter of the drill rod body 12, and the inner diameter size of the sleeve 11 is selected according to the different sizes of the drill rod body 12. The end of the guide rod 1 away from the drill rod body 12 is connected to the sleeve 11, and an aluminum alloy plate or a stainless steel plate with a size equivalent to the inner wall of the sleeve 11 can be set on the surface of the guide rod 1 and snapped into the inner wall of the sleeve 11 to realize the connection between the guide rod 1 and the sleeve 11. This connection state allows the guide rod 1 to adjust the pointing angle in the sleeve 11. After the guide rod 1 is inserted into the drill rod body 12, the sleeve 11 can be sleeved on the outer wall of the drill rod body 12 to provide stable support and protection for the guide rod 1, thereby avoiding damage to the guide rod 1 during the removal of the broken drill rod.

[0030] Furthermore, a movable groove is provided on the surface of the guide rod 1, and a push plate 4 slides through the movable groove. The push plate 4 slides axially on the surface of the guide rod 1. A reverse thread 32 is provided on the surface of the rotating shaft 3 that is adapted to the push plate 4. The push plate 4 is threadedly connected to the reverse thread 32. A receiving ring 41 is slid on the inner wall of the sleeve 11. The receiving ring 41 is fixedly connected to a plurality of inclined blocks 42 at one end away from the push plate 4. The surface of the inclined block 42 is an inclined surface. A clamping block 43 is provided on the inner wall of the sleeve 11 close to the drill rod body 12. The clamping block 43 is made of elastic steel, and one end of the clamping block 42 is fixedly connected to the inner wall of the sleeve 11. One end of the inclined block 42 is inserted between the clamping block 43 and the inner wall of the sleeve 11.

[0031] Specifically, the positive thread 31 and the negative thread 32 have opposite thread patterns. Therefore, when the rotating shaft 3 rotates, the positive thread 31 drives the moving block 23 and the push block 22 to move in the direction away from the drill rod body 12, while the negative thread 32 drives the push plate 4 to move in the direction close to the drill rod body 12, so that the push plate 4 can push the receiving ring 41, and then drive the inclined block 42 to insert into the gap between the clamping block 43 and the inner wall of the sleeve 11. Moreover, since the inclined block 42 is set to an inclined surface, the distance between the clamping block 43 and the inner wall of the sleeve 11 is gradually expanded during the continuous insertion process, so that the clamping block 43 is deformed and can be fastened to the outer wall surface of the drill rod body 12, cooperating with the movable plate 2 for internal and external clamping, thereby improving the clamping stability of the broken drill rod.

[0032] Among them, the inner diameter of the receiving ring 41 is larger than the outer diameter of the guide rod 1. In this way, when the insertion angle of the drill rod body 12 is adjusted due to the invasion of foreign matter into the guide rod 1, the larger inner diameter of the receiving ring 41 can be used to reserve space for the guide rod 1 to move, and the outer diameter of the push plate 4 should be larger than the inner diameter of the receiving ring 41, so as to ensure that the push plate 4 can still abut against the surface of the receiving ring 41.

[0033] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for removing a broken drill rod, comprising a guide rod (1) and a drill rod body (12), wherein the outer diameter of the guide rod (1) is smaller than the inner diameter of the drill rod body (12), and wherein: One end of the guide rod (1) close to the drill rod body (12) is configured in an arc shape; It also includes a positioning assembly for biting the inner wall of the broken drill rod, which is arranged on the surface of the guide rod (1), and the positioning assembly includes a plurality of movable plates (2) hinged on the surface of the guide rod (1). The guide rod (1) is rotatably connected to a rotating shaft (3) at an internal axial position, and a positive thread (31) is provided on the surface of the rotating shaft (3). A push block (22) is provided on the side of the movable plate (2) close to the inside of the guide rod (1), and the push block (22) is connected to the movable plate (2) through a connecting block (221). A moving block (23) is provided in the push block (22), and a plurality of balls (231) are movably connected to the bottom of the moving block (23), and the balls (231) are embedded in the grooves of the positive thread (31); It also includes an adjustment component for disengaging the ball (231) from the positive thread (31) groove to position the movable plate (2).

2. A broken drill rod removal device according to claim 1, characterized in that: The adjustment component includes a contact plate (21), the contact plate (21) is arranged on the surface of the movable plate (2) and away from the hinge point of the movable plate (2) and the guide rod (1), the contact plate (21) is connected to the movable plate (2) through a plurality of pressure switches (211), the moving block (23) slides in the push block (22), and the moving block (23) is set to a ferromagnetic material, and an electromagnet (232) adapted to the moving block (23) is fixedly connected to the top of the push block (22), and the electromagnet (232) is electrically connected to the pressure switch (211); It also includes a fixing component for positioning the rotation angle of the movable plate (2).

3. The broken drill rod removal device according to claim 2, characterized in that: A plurality of anti-slip grooves are provided on the surface of the contact plate (21).

4. A broken drill rod removal device according to claim 2, characterized in that: The fixed assembly includes abutment blocks (24) fixedly connected to both sides of the moving block (23), and a clamping block (241) is slidably provided in the push block (22) at positions close to both sides of the moving block (23). The clamping block (241) abuts against the abutment blocks (24), and a sliding groove for sliding the push block (22) is provided on the inner wall of the guide rod (1), and a rack (242) is provided along the inner wall of the sliding groove, and a tooth groove adapted to the rack (242) is provided at one end of the clamping block (241).

5. The broken drill rod removal device according to claim 4, characterized in that: The clamping block (241) is connected to the pushing block (22) via a tension spring (243).

6. A broken drill rod removal device according to any one of claims 1 to 5, characterized in that: The surface of the guide rod (1) is covered with a sleeve (11), the inner diameter of the sleeve (11) is larger than the outer diameter of the drill rod body (12), and one end of the guide rod (1) away from the drill rod body (12) is connected to the sleeve (11).

7. The broken drill rod removal device according to claim 5, characterized in that: A movable groove is provided on the surface of the guide rod (1), and a push plate (4) slides through the movable groove. A reverse thread (32) adapted to the push plate (4) is provided on the surface of the rotating shaft (3). A receiving ring (41) is slidably provided on the inner wall of the sleeve (11). An end of the receiving ring (41) away from the push plate (4) is fixedly connected to a plurality of inclined blocks (42). A clamping block (43) is provided on the inner wall of the sleeve (11) near the end of the drill rod body (12). One end of the inclined block (42) is inserted between the clamping block (43) and the inner wall of the sleeve (11).

8. The broken drill rod removal device according to claim 6, characterized in that: The inner diameter of the receiving ring (41) is larger than the outer diameter of the guide rod (1).

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