Reverse circulation drilling machine capable of preventing clamping fault

Abstract

The invention relates to the technical field of building construction, in particular to a reverse circulation drilling machine capable of preventing clamping faults, which comprises a drill bit, a drill rod, an anti-blocking connecting device and an impeller, the drill bit is arranged at the lower end of the anti-blocking connecting device, and the drill rod is arranged at the upper end of the anti-blocking connecting device. The drill bit, the drill rod and the anti-blocking connecting device are detachably connected; the drill bit is of a hollow structure, and a suction inlet is formed in the surface. The drill rod and the anti-blocking connecting device are both of a hollow structure and communicate with the hollow structure in the drill bit. The impeller is arranged at the end, away from the anti-blocking connecting device, of the drill rod. Through the synergistic effect of the clamping arm structure and the elastic blocking structure, the anti-blocking connecting device can reliably block large-particle-size stones, prevent the large-particle-size stones from blocking the impeller, effectively prevent the drilling machine from clamping faults, guarantee stable operation of equipment, reduce the shutdown maintenance time and improve the construction efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of construction, and in particular to a reverse circulation drill for preventing clamping failures. Background Art

[0002] The construction principle of a reverse circulation drill is to pump the mud chips cut by the drill bit through the drill pipe to the outside of the hole by a sand pump. However, during the construction process, large-sized stones may directly be sucked into the impeller at the upper part of the drill through the drill pipe, causing the impeller shaft to be stuck and unable to continue drilling. It is necessary to remove the entire drill pipe and all the connecting components of the impeller, find the stone and then take it out. This is time-consuming and laborious, and affects the construction efficiency. Summary of the Invention

[0003] The purpose of the present invention is to provide a reverse circulation drill for preventing clamping failures, so as to solve at least one technical problem existing in the prior art.

[0004] To solve the above technical problems, a reverse circulation drill for preventing clamping failures provided by the present invention includes a drill bit, a drill pipe, an anti-blocking connection device, and an impeller; The drill bit is arranged at the lower end of the anti-blocking connection device, and the drill pipe is arranged at the upper end of the anti-blocking connection device; The drill bit, the drill pipe and the anti-blocking connection device are detachably connected; The drill bit is of a hollow structure, and a suction port is arranged on the surface; Both the drill pipe and the anti-blocking connection device are of hollow structures and are communicated with the hollow structure inside the drill bit; The impeller is arranged at one end of the drill pipe away from the anti-blocking connection device; After being driven by an external force to rotate, the impeller generates a suction force, so that the crushed stones and mud outside the drill bit are sucked in from the suction port of the drill bit, and pass through the hollow structures of the drill bit, the anti-blocking connection device and the drill pipe to reach the impeller, and continue to move to the mud discharge pipeline to be discharged; The anti-blocking connection device is used to prevent large-sized stones from being sucked in and getting stuck at the impeller, resulting in a failure of the drill.

[0005] Further, the drill bit includes a main body and drill teeth; The drill teeth are distributed on the surface of the main body; The suction port is arranged at the place where there are no drill teeth distributed on the main body; The diameter of the suction port is less than or equal to the inner diameter of the drill pipe.

[0006] Further, a first screw thread connection pair is arranged between the drill pipe and the anti-blocking connection device; A second screw thread connection pair is arranged between the drill bit and the anti-blocking connection device; The drill pipe and the anti-blocking connection device are connected to each other through the first screw connection pair; The drill bit and the anti-blocking connection device are connected to each other through the second screw connection pair.

[0007] Further, the first screw connection pair includes an internal thread provided at the bottom end of the drill pipe and an external thread provided at the top end of the anti-blocking connection device; Alternatively, the first screw connection pair includes an external thread provided at the bottom end of the drill pipe and an internal thread provided at the top end of the anti-blocking connection device.

[0008] Further, the second screw connection pair includes an internal thread provided at the top end of the drill bit and an external thread provided at the bottom end of the anti-blocking connection device; Alternatively, the second screw connection pair includes an external thread provided at the top end of the drill bit and an internal thread provided at the bottom end of the anti-blocking connection device.

[0009] Further, the anti-blocking connection device includes a housing and a clamping arm structure; The clamping arm structure is arranged inside the housing and is used to block large-sized stones from passing through the housing, thereby preventing the impeller from being stuck.

[0010] Further, the clamping arm structure includes a blocking arm and a slot provided on the inner wall of the housing; One end of the blocking arm extends into the slot and is connected to the housing, and the other end extends out of the slot and is exposed in the hollow area surrounded by the housing.

[0011] Further, at least 3 clamping arm structures are circumferentially arranged on the inner wall of the housing.

[0012] Further, the slot includes a longitudinal slot and a first transverse slot that communicate with each other; The blocking arm is inserted into the first transverse slot; A limit key is inserted into the longitudinal slot for limiting the blocking arm fixed in the first transverse slot.

[0013] Further, a clamping convex is connected to the blocking arm through a first spring; The slot includes a clamping groove corresponding to the clamping convex; When the clamping convex does not reach the clamping groove, the first spring is compressed by the clamping convex; When the clamping convex reaches the clamping groove, the elasticity of the first spring is released, and the clamping convex tends to be tightly abutted in the clamping groove under the thrust of the first spring.

[0014] Further, telescopic socket cylinders are also provided on the clamping protrusions and the blocking arms, and the first spring is inside the telescopic socket cylinders; The telescopic socket cylinders are of rigid structures and include outer cylinders and inner cylinders; The outer cylinders are integrally connected to the clamping protrusions, and the inner cylinders are integrally connected to the blocking arms; Alternatively, the outer cylinders are integrally connected to the blocking arms, and the inner cylinders are integrally connected to the clamping protrusions; After the first spring elastically releases, the clamping protrusions are clamped in the card slots, and the telescopic socket cylinders restrict the movement of the blocking arms in the radial direction.

[0015] Further, the outer diameter of the telescopic socket cylinders is smaller than the inner diameter of the card slots, so that the telescopic sleeves are allowed to move in the card slots, thereby resolving the impact force of large - sized stones on the blocking arms.

[0016] Further, the outer extension end of the blocking arm is in a "one" shape, a "Y" shape or a "W" shape.

[0017] Further, the anti - clogging connection device further includes an elastic blocking structure; The elastic blocking structure is arranged inside the housing body and is closer to the drill bit than the clamping arm structure, and is used for elastically blocking large - sized stones when the impeller is running, and releasing elastic potential energy to push out the large - sized stones when the impeller stops running or runs in reverse.

[0018] Further, the elastic blocking structure includes a lock head and a second spring; The lock head is connected to the inner wall of the housing body; The top end of the second spring is connected to the lock head; When the impeller is working, large - sized stones are inhaled and contact the second spring to compress the second spring. The second spring stores elastic potential energy. When the impeller stops running or runs in reverse, the elastic potential energy of the second spring is released to push out the large - sized stones.

[0019] Further, the slotting includes second transverse slots communicated with the longitudinal slots; One end of the lock head extends into the second transverse slots and is clamped in the second transverse slots, and the other end extends out of the second transverse slots and is exposed in the hollow area surrounded by the housing body and is connected to the second spring.

[0020] Further, the end of the lock head extending into the second transverse slots is in a "work" - shaped structure, and the second transverse slots are provided with slot bodies matching the "work" - shaped structure of the lock head; After the lock head is horizontally inserted into the second transverse groove from the longitudinal groove, a limit key is inserted into the longitudinal groove to limit the lock head fixed in the second transverse groove.

[0021] Further, a clamping protrusion is provided on the lock head; A clamping groove matching the shape of the clamping protrusion is provided on the second spring; The clamping protrusion is clamped in the clamping groove, so that the second spring is connected to the lock head.

[0022] Further, the clamping protrusion is made of a magnetic material, so as to magnetically attract each other with the second spring and improve the connection stability.

[0023] Further, a magnetic lock piece is fixedly provided on the clamping groove; The magnetic lock piece is made of a magnetic material; The clamping protrusion is made of a material that can be adsorbed by a magnetic material; The clamping protrusion is clamped in the magnetic lock piece, and the clamping protrusion and the magnetic lock piece attract each other to reduce creep.

[0024] Further, a gravel cone is further included; The gravel cone is arranged in the main body of the drill bit and is located directly below the inner wall of the main body; When the elastic blocking structure ejects large-sized stones, the large-sized stones collide with the gravel cone and break into multiple small-sized stones.

[0025] Further, a grinding stone cylinder is further included; The grinding stone cylinder includes an inner cylinder and grinding stone particles fixedly arranged on the inner cylinder; The inner cylinder is fixedly arranged in the outer shell body and is located at the height of the second spring; The large-sized stones with loose texture blocked by the elastic blocking structure gradually loosen by rubbing against the grinding stone particles and thus break into multiple small-sized stones.

[0026] Further, the inner cylinder is fixed on the inner wall of the outer shell body through a fastener.

[0027] Adopting the above technical solution, the present invention has the following beneficial effects: (1) Through the cooperative action of the clamping arm structure and the elastic blocking structure, the anti-blocking connection device can reliably block large-sized stones, avoid jamming the impeller, effectively prevent the drilling rig from having a clamping failure, ensure the stable operation of the equipment, reduce the shutdown and maintenance time, and improve the construction efficiency.

[0028] (2) The drill bit, drill pipe, and anti-blocking connection device are connected by a screw thread connection pair. This connection method has a simple structure and a firm connection, ensuring a tight connection between components, not easily loosening under complex working conditions, and guaranteeing the overall structural stability of the drilling rig. At the same time, when the anti-blocking connection device needs to be replaced, it can be replaced simply by unscrewing the screw thread, which is simple and convenient to operate.

[0029] (3) Through unique design, the clamping arm structure includes components such as a blocking arm, a slotted groove, a limit key, a clamping projection, and a telescopic sleeve cylinder. It can not only limit the movement of the blocking arm in the radial direction but also resolve the impact force of large-sized stones, making the blocking arm more stable and flexible when blocking stones, and improving the anti-blocking effect.

[0030] (4) The elastic blocking structure uses the cooperation of a lock head and a second spring to elastically block large-sized stones and store elastic potential energy during the operation of the impeller, and releases the elastic potential energy to push the stones out when the impeller stops or runs in the reverse direction, realizing the dynamic treatment of large-sized stones and effectively avoiding stone accumulation.

[0031] (5) The connection between the lock head and the second spring is through the clamping of a clamping projection and a clamping groove, as well as the mutual attraction of magnetic materials, which improves the connection stability, reduces creep, and ensures the stable and reliable performance of the elastic blocking structure during long-term use.

[0032] (6) The setting of the gravel cone and the grinding stone cylinder respectively crushes the large-sized stones ejected and blocked by the elastic blocking structure, converts the large-sized stones into small-sized stones for easy discharge, further reduces the risk of blockage, and improves the working efficiency of the drilling rig. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0034] Figure 1 It is a schematic structural diagram when large-sized stones are inhaled by the reverse circulation drilling rig and cause an obstacle to the impeller; Figure 2 It is a disassembled structural diagram of the reverse circulation drilling rig for preventing clamping failures disclosed in the present application; Figure 3 It is a bottom view of the anti-blocking connection device; Figure 4 It is a schematic structural diagram of the slotted groove; Figure 5 It is a schematic structural diagram when the first transverse groove is installed with the clamping arm structure; Figure 6Schematic diagram of the completed installation structure of the first transverse groove and the clamping arm structure; Figure 7 Schematic diagram of the blocking arm, the first spring and the clamping projection; Figure 8 Schematic cross-sectional view of the telescopic socket cylinder; Figure 9 Schematic diagram of the W-shaped blocking arm; Figure 10 Schematic diagram of the Y-shaped blocking arm; Figure 11 Schematic diagram of the structure during the installation of the second transverse groove and the elastic blocking structure; Figure 12 Schematic diagram of the lock head from the front view perspective; Figure 13 Schematic diagram of the lock head from the left view perspective; Figure 14 Schematic diagram of the magnetic attraction lock piece and the clamping groove; Figure 15 Schematic diagram of the structure when the lock head, the magnetic attraction lock piece and the second spring are connected; Figure 16 Schematic diagram of the elastic blocking structure rebounding large-sized stones and the gravel cone crushing stones; Figure 17 Schematic diagram of the clamping arm structure blocking large-sized stones and the grinding stone cylinder working; Figure 18 Schematic diagram of the grinding stone cylinder from the top view perspective when working.

[0035] Reference signs: 1 - Drill bit; 11 - Main body; 12 - Drill teeth; 13 - Suction port; 14 - Gravel cone; 2 - Drill pipe; 3 - Anti-blocking connection device; 31 - Outer housing; 32 - Grooves; 321 - Longitudinal groove; 322 - First transverse groove; 323 - Second transverse groove; 324 - Card slot; 33 - Limit key; 34 - Grinding stone cylinder; 341 - Inner cylinder; 342 - Fastener; 342 - Grinding stone particles; 4 - Impeller; 51 - First screw thread connection pair; 52 - Second screw thread connection pair; 53 - Internal screw thread; 54 - External screw thread; 6 - Clamping arm structure; 61 - Blocking arm; 62 - First spring; 63 - Clamping projection; 64 - Telescopic socket cylinder; 641 - Outer sleeve; 642 - Inner sleeve; 7 - Elastic blocking structure; 71 - Lock head; 711 - Clamping protrusion; 72 - Second spring; 721 - Clamping groove; 73 - Magnetic attraction lock piece. Detailed implementation manners

[0036] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0037] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It 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 operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0038] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "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 invention can be understood according to specific situations.

[0039] It should also be noted that the following specific embodiments or specific implementation manners are a series of optimized setting manners listed by the present invention to further explain the specific invention content, and these setting manners can be combined with each other or used in association with each other.

[0040] The present invention will be further explained below in conjunction with specific implementation manners.

[0041] As Figure 1-2 shown, a reverse circulation drill for preventing clamping failures provided in this embodiment includes a drill bit 1, a drill pipe 2, an anti-blocking connection device 3, and an impeller 4; The drill bit 1 is arranged at the lower end of the anti-blocking connection device 3, and the drill pipe 2 is arranged at the upper end of the anti-blocking connection device 3; The drill bit 1, the drill pipe 2 and the anti-blocking connection device 3 are detachably connected; The drill bit 1 has a hollow structure, and a suction port 13 is arranged on the surface; Both the drill pipe 2 and the anti-blocking connection device 3 have hollow structures and are communicated with the hollow structure inside the drill bit 1; The impeller 4 is arranged at one end of the drill pipe 2 away from the anti-blocking connection device 3; After the impeller 4 is driven by an external force to rotate, a suction force is generated, so that the crushed stones and mud outside the drill bit 1 are sucked in from the suction port 13 of the drill bit 1, pass through the hollow structures of the drill bit 1, the anti-blocking connection device 3 and the drill pipe 2 to reach the impeller 4, and continue to move to the sludge discharge pipeline to be discharged; The anti-blocking connection device 3 is used to prevent large-particle-size stones from being sucked in and getting stuck at the impeller 4, resulting in malfunctions of the drilling rig.

[0042] During the operation of a traditional reverse circulation drilling rig, while the drill bit 1 drills downward, the impeller 4 extracts mud. The mud enters the hollow area of the drilling rig through the suction port 13 provided on the drill bit 1 and continuously rises. However, during this process, the mud may contain some large-particle-size stones. After these stones are pumped up, the impeller 4 will be stuck, and the corresponding motor will be stalled or even the equipment will be damaged. Although such stones are relatively few, once the impeller 4 is stuck, the equipment needs to be shut down and the impeller 4 structure needs to be taken out to remove the stones. Therefore, in this application, by setting the anti-blocking connection device 3, large-particle-size stones are blocked and discharged to avoid the occurrence of the above problems.

[0043] As Figure 1-2 shown, as a further implementation manner of this embodiment, the drill bit 1 includes a main body 11 and drill teeth 12; The drill teeth 12 are distributed on the surface of the main body 11; The suction port 13 is provided at the position where no drill teeth 12 are distributed on the main body 11; The diameter of the suction port 13 is less than or equal to the inner diameter of the drill pipe 2.

[0044] As Figure 2 shown, as a further implementation manner of this embodiment, a first screw thread connection pair 51 is provided between the drill pipe 2 and the anti-blocking connection device 3; A second screw thread connection pair 52 is provided between the drill bit 1 and the anti-blocking connection device 3; The drill pipe 2 and the anti-blocking connection device 3 are connected to each other through the first screw thread connection pair 51; The drill bit 1 and the anti-blocking connection device 3 are connected to each other through the second screw thread connection pair 52.

[0045] As Figure 2 shown, as a further implementation manner of this embodiment, the first screw thread connection pair 51 includes an internal screw thread 53 provided at the bottom end of the drill pipe 2 and an external screw thread 54 provided at the top end of the anti-blocking connection device 3; Alternatively, the first screw thread connection pair 51 includes an external screw thread 54 provided at the bottom end of the drill pipe 2 and an internal screw thread 53 provided at the top end of the anti-blocking connection device 3.

[0046] As Figure 2 shown, as a further implementation manner of this embodiment, the second screw connection pair 52 includes an internal screw 53 provided at the top end of the drill bit 1 and an external screw 54 provided at the bottom end of the anti-blocking connection device 3; Alternatively, the second screw connection pair 52 includes an external screw 54 provided at the top end of the drill bit 1 and an internal screw 53 provided at the bottom end of the anti-blocking connection device 3.

[0047] In this application, the anti-blocking connection device 3 is connected to the drill pipe 2 and the drill bit 1 through a screw connection pair. During use, when the anti-blocking connection device 3 is aged, blocked, etc., the on-site construction can quickly replace the new anti-blocking connection device 3.

[0048] As Figure 3 shown, as a further implementation manner of this embodiment, the anti-blocking connection device 3 includes a housing 31 and a clamping arm structure 6; The clamping arm structure 6 is arranged inside the housing 31 and is used to block large-particle stones from passing through the housing 31, thereby preventing the impeller 4 from being stuck.

[0049] As Figure 3-10 shown, as a further implementation manner of this embodiment, the clamping arm structure 6 includes a blocking arm 61 and a slot 32 provided on the inner wall of the housing 31; One end of the blocking arm 61 extends into the slot 32 and is connected to the housing 31, and the other end extends out of the slot 32 and is exposed in the hollow area surrounded by the housing 31.

[0050] As Figure 3 shown, as a further implementation manner of this embodiment, at least 3 clamping arm structures 6 are arranged circumferentially on the inner wall of the housing 31.

[0051] As Figure 4-6 shown, as a further implementation manner of this embodiment, the slot 32 includes a longitudinal slot 321 and a first transverse slot 322 that communicate with each other; The blocking arm 61 is inserted into the first transverse slot 322; A limit key 33 is inserted into the longitudinal slot 321 for limiting the blocking arm 61 fixed in the first transverse slot 322.

[0052] As Figure 5-10 shown, as a further implementation manner of this embodiment, a clamping convex 63 is connected to the blocking arm 61 through a first spring 62; The slot 32 includes a card slot 324 corresponding to the clamping convex 63; When the locking protrusion 63 does not reach the locking groove 324 , the first spring 62 is compressed by the locking protrusion 63 ; When the locking protrusion 63 reaches the locking groove 324 , the elasticity of the first spring 62 is released, and the locking protrusion 63 tends to be pushed by the first spring 62 and tightly abut against the locking groove 324 .

[0053] like Figure 8 As shown, as a further implementation of this embodiment, a telescopic sleeve 64 is further provided on the clamping protrusion 63 and the blocking arm 61, and the first spring 62 is inside the telescopic sleeve 64; The telescopic sleeve 64 is a rigid structure, including an outer sleeve 641 and an inner sleeve 642; The outer sleeve 641 is integrally connected to the clamping protrusion 63, and the inner sleeve 642 is integrally connected to the blocking arm 61; Alternatively, the outer sleeve 641 is integrally connected to the blocking arm 61, and the inner sleeve 642 is integrally connected to the clamping protrusion 63; After the first spring 62 is elastically released, the locking protrusion 63 is locked in the locking groove 324 , and the telescopic sleeve 64 limits the movement of the blocking arm 61 in the radial direction.

[0054] like Figure 8 As shown, as a further implementation of this embodiment, the outer diameter of the telescopic sleeve 64 is smaller than the inner diameter of the slot 324, so that the telescopic sleeve is allowed to move in the slot 324, thereby eliminating the impact force of large-size stones on the blocking arm 61.

[0055] like Figure 9-10 As shown, as a further implementation of this embodiment, the outwardly extending end of the blocking arm 61 is in an "I" shape, a "Y" shape or a "W" shape.

[0056] The clamping arm structure 6 in the present application is arranged in the outer shell 31, and the stones are blocked by the multiple blocking arms 61 extending outward. After the stones are blocked, the gaps on the sides of the stones can also continue to allow the mud to flow. When the mud flow at the impeller 4 is too small, it means that there are too many stones in the anti-blocking connection device 3. The blocking arm 61 is installed by the first spring 62 and the clamping protrusion 63. In addition, the telescopic sleeve 64 also exposes a certain activity space with the inner wall of the clamping groove 324 when connected, so that when the large-size stone impacts the blocking arm 61, the impact force can be resolved by the movement of the telescopic sleeve and the lateral expansion and contraction of the first spring 62, avoiding damage to the blocking arm 61 and extending the service life of the device.

[0057] like Figure 11-16 As shown, as a further implementation of this embodiment, the anti-blocking connection device 3 also includes an elastic blocking structure 7; The elastic blocking structure 7 is disposed within the outer housing 31 and is closer to the drill bit 1 than the clamping arm structure 6, and is configured to elastically block large-sized stones during operation of the impeller 4, and release elastic potential energy to push out the large-sized stones when the impeller 4 stops operating or operates in reverse.

[0058] After the lock head 71 and the blocking arm 61 are both installed, a limit key 33 is inserted into the longitudinal groove 321, and at this time, the movement spaces of the lock head 71 and the blocking arm 61 are restricted. When disassembly or replacement is required, first remove the limit key 33, and then remove the lock head 71 and the blocking arm 61. The limit key 33 blocks the transverse grooves on the side when the lock head 71 and the blocking arm 61 are installed and disassembled, and can also prevent mud or water from entering the groove 32, affecting the installation and disassembly of the lock head 71 and the blocking arm 61.

[0059] As Figure 11-16 shown, as a further implementation manner of this embodiment, the elastic blocking structure 7 includes a lock head 71 and a second spring 72; The lock head 71 is connected to the inner wall of the outer housing 31; The top end of the second spring 72 is connected to the lock head 71; When the impeller 4 is operating, large-sized stones are sucked in and contact the second spring 72 to compress the second spring 72. The second spring 72 stores elastic potential energy. When the impeller 4 stops operating or operates in reverse, the elastic potential energy of the second spring 72 is released to push out the large-sized stones.

[0060] As Figure 11 shown, as a further implementation manner of this embodiment, the groove 32 includes a second transverse groove 323 communicating with the longitudinal groove 321; One end of the lock head 71 extends into the second transverse groove 323 and is clamped in the second transverse groove 323, and the other end extends out of the second transverse groove 323 and is exposed in the hollow area surrounded by the outer housing 31 and is connected to the second spring 72.

[0061] As a further implementation manner of this embodiment, the end of the lock head 71 extending into the second transverse groove 323 is an "I" shape structure, and the second transverse groove 323 has a groove body (not shown in the figure) matching the "I" shape structure of the lock head 71; After the lock head 71 is horizontally inserted into the second transverse groove 323 from the longitudinal groove 321, a limit key 33 is inserted into the longitudinal groove 321 to limit the lock head 71 fixed in the second transverse groove 323.

[0062] As Figure 12-15As shown, as a further implementation of this embodiment, the lock head 71 is provided with a clamping protrusion 711; The second spring 72 is provided with a clamping groove 721 matching the shape of the clamping protrusion 711; The engaging protrusion 711 is engaged in the engaging groove 721 , so that the second spring 72 is connected to the lock head 71 .

[0063] As a further implementation of this embodiment, the clamping protrusion 711 is made of magnetic material, so as to be magnetically attracted to the second spring 72 to improve the connection stability.

[0064] like Figure 14-15 As shown, as a further implementation of this embodiment, a magnetic lock piece 73 is fixedly provided on the clamping groove 721; The magnetic lock piece 73 is made of magnetic material; The clamping protrusion 711 is made of a material that can be adsorbed by magnetic materials; The engaging protrusion 711 is engaged with the magnetic locking piece 73 , and the engaging protrusion 711 and the magnetic locking piece 73 attract each other to reduce creeping.

[0065] like Figure 16 As shown, as a further implementation of this embodiment, it also includes a stone crushing cone 14; The stone crushing cone 14 is arranged in the main body 11 of the drill bit 1 and is located directly below the inner wall of the main body 11; When the elastic blocking structure 7 ejects the large-diameter stone, the large-diameter stone collides with the stone crushing cone 14 and breaks into a plurality of small-diameter stones.

[0066] The elastic blocking structure 7 disclosed in the present application relies on the second spring 72 to hold the stone and store elastic potential energy. When the impeller 4 stops working or reverses, the elastic potential energy of the second spring 72 is released to eject the stone downward, and the stone is broken into multiple small-diameter stones after colliding with the stone crushing cone 14. At the same time, due to the outflow of mud, the broken stones flow out of the drill bit 1 with the mud. After the impeller 4 is restarted, the drill bit 1 further crushes the stones, so that the original large stones become small gravel and pass through the impeller 4 with the mud without causing the impeller 4 to get stuck.

[0067] like Figure 17-18 As shown, as a further implementation of this embodiment, it also includes a grinding stone cylinder 34; The grinding stone cylinder 34 includes an inner cylinder 341 and grinding stone particles 342 fixedly arranged on the inner cylinder 341; The inner cylinder 341 is fixedly disposed in the outer shell 31 and is located at the height of the second spring 72; The large - sized stones with loose texture blocked by the elastic blocking structure 7 gradually loosen due to friction with the abrasive particles 342, and thus break into multiple small - sized stones.

[0068] As Figure 17-18 shown, as a further implementation manner of this embodiment, the inner cylinder 341 is fixed on the inner wall of the outer housing 31 through the fastener 342.

[0069] Adopting the above - mentioned technical solution, the present invention has the following beneficial effects: (1) By setting the anti - block connection device 3, it can effectively prevent large - sized stones from being sucked in and stuck at the impeller 4, avoid equipment failures caused by stone blockages, ensure the stable operation of the drill rig, reduce downtime for maintenance, and improve construction efficiency.

[0070] (2) The drill bit 1, the drill pipe 2 and the anti - block connection device 3 are connected by a screw - thread connection pair, which is convenient for quickly replacing the aged or blocked anti - block connection device 3 on - site, improves the convenience of equipment maintenance, and reduces the maintenance cost.

[0071] (3) The arm - locking structure 6 realizes the reliable blocking of large - sized stones through the cooperation of the blocking arm 61 and the slot 32, and the elastic design of the first spring 62 and the clamping projection 63. At the same time, the design of the telescopic sleeve 64 effectively dissipates the impact force of the stones and prolongs the service life of the device.

[0072] (4) The elastic blocking structure 7 utilizes the elastic potential energy of the second spring 72 to elastically block large - sized stones during the operation of the impeller 4, and releases the elastic potential energy to push the stones out when the impeller 4 stops or runs in the reverse direction, realizing the dynamic treatment of the stones and avoiding blockages.

[0073] (5) The locking head 71 and the second spring 72 are connected by the clamping of the clamping protrusion 711 and the clamping groove 721, and the mutual attraction of magnetic materials, ensuring stable and reliable connection, reducing creep, and improving the overall performance of the equipment.

[0074] (6) The settings of the gravel cone 14 and the grinding stone cylinder 34 respectively perform fragmentation treatment on the large - sized stones that pop out and are blocked, convert large stones into small gravels, further reduce the risk of blockage, and improve the working efficiency of the drill rig.

[0075] Finally, it should be noted that: the above - mentioned embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A reverse circulation drilling rig for preventing jamming failure, characterized in that: It includes a drill bit, a drill rod, an anti-blocking connection device and an impeller; The drill bit is arranged at the lower end of the anti-blocking connection device, and the drill rod is arranged at the upper end of the anti-blocking connection device; The drill bit and the drill rod are detachably connected to the anti-blocking connection device; The drill bit is a hollow structure, and a suction port is provided on the surface; The drill rod and the anti-blocking connection device are both hollow structures and are connected to the hollow structure in the drill bit; The impeller is arranged at one end of the drill rod away from the anti-blocking connection device; The impeller is driven by the outside to rotate and generate suction force, so that the rocks and mud crushed outside the drill bit are sucked from the suction port of the drill bit, and pass through the drill bit, the anti-blocking connection device and the hollow structure of the drill rod to reach the impeller, and continue to move to the mud discharge pipeline to be discharged; The anti-blocking connection device is used to prevent large-diameter stones from being sucked in and getting stuck at the impeller, causing the drilling rig to malfunction.

2. The reverse circulation drilling rig for preventing sticking failure according to claim 1, characterized in that: The drill bit comprises a main body and drill teeth; The drill teeth are distributed on the surface of the main body; A suction port is provided on the main body at a location where no drill teeth are distributed; The diameter of the suction port is less than or equal to the inner diameter of the drill rod.

3. The reverse circulation drilling rig for preventing sticking failure according to claim 2, characterized in that: A first threaded connection pair is provided between the drill rod and the anti-blocking connection device; A second threaded connection pair is provided between the drill bit and the anti-blocking connection device; The drill rod and the anti-blocking connection device are connected to each other through the first threaded connection pair; The drill bit and the anti-blocking connection device are connected to each other through the second threaded connection pair.

4. The reverse circulation drilling rig for preventing sticking failure according to claim 3, characterized in that: The first threaded connection pair includes an inner thread arranged at the bottom end of the drill rod and an outer thread arranged at the top end of the anti-blocking connection device; Alternatively, the first threaded connection pair includes an outer thread arranged at the bottom end of the drill rod and an inner thread arranged at the top end of the anti-blocking connection device.

5. The reverse circulation drilling rig for preventing sticking failure according to claim 3, characterized in that: The second threaded connection pair includes an inner thread arranged at the top end of the drill bit and an outer thread arranged at the bottom end of the anti-blocking connection device; Alternatively, the second threaded connection pair includes an outer thread arranged at the top end of the drill bit and an inner thread arranged at the bottom end of the anti-blocking connection device.

6. The reverse circulation drilling rig for preventing sticking failure according to claim 3, characterized in that: The anti-blocking connection device comprises an outer shell and a clamping arm structure; The clamping arm structure is arranged in the outer shell to prevent large-diameter stones from passing through the outer shell, thereby preventing the impeller from being stuck.

7. The reverse circulation drilling rig for preventing sticking failure according to claim 6, characterized in that: The clamping arm structure comprises a blocking arm and a slot arranged on the inner wall of the outer shell; One end of the blocking arm extends into the slot and is connected to the outer shell, and the other end extends out of the slot to be exposed in the hollow area surrounded by the outer shell.

8. The reverse circulation drilling rig for preventing sticking failure according to claim 6, characterized in that: The number of the clamp arm structures provided is no less than 3 in the circumferential direction of the inner wall of the outer shell.

9. The reverse circulation drilling rig for preventing sticking failure according to claim 7, characterized in that: The slots include a longitudinal slot and a first transverse slot that are interconnected; The barrier arm is inserted into the first transverse groove; A limit key is inserted into the longitudinal groove to limit the blocking arm fixed in the first transverse groove.

10. The reverse circulation drilling rig for preventing sticking failure according to claim 9, characterized in that: The blocking arm is provided with a locking protrusion after being connected by a first spring; The slot includes a slot corresponding to the protrusion; When the locking protrusion does not reach the locking groove, the first spring is compressed by the locking protrusion; When the locking protrusion reaches the locking slot, the elasticity of the first spring is released, and the locking protrusion tends to be pushed by the first spring and tightly abut against the locking slot.

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