Drilling rig drill bit anti-falling device and drilling assembly structure

Abstract

The application provides a drill bit anti-falling device and a drilling assembly structure, and belongs to the technical field of drilling rigs. The technical problem of long fishing time of a drill bit when the drill bit and a drill rod are broken is solved. The drill bit anti-falling device comprises a first anti-falling structure, a second anti-falling structure and a flexible connecting piece. The first anti-falling structure comprises a mounting seat and a rotating ring. The mounting seat is fixed to the outer wall of the drill rod. The rotating ring is movably arranged on the mounting seat. One end of the flexible connecting piece is connected with the rotating ring, and the other end is connected with the drill bit. When the drill rod and the drill bit are broken, the drill rod is still connected with a power device for transmission. The power device will drive the drill rod to rotate at this time. The drill rod will drive the annular mounting cavity to rotate when rotating. Since the rotating ring is movably arranged in the annular mounting cavity, the annular mounting cavity will move relative to the rotating ring at this time. The flexible connecting piece is prevented from being wound and twisted off, so that the drill bit will not fall off from the drill rod, and the time required for fishing the drill bit is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drilling rig, in particular to a drilling rig drill bit anti-falling device and a drilling assembly structure. BACKGROUND

[0002] In the process of building construction, a drilling rig is usually used to form a hole. The main transmission component of the drilling rig is a drilling assembly structure, which includes a drill pipe and a drill bit connected to one end of the drill pipe. A power device in the drilling rig is in transmission connection with the drill pipe. The power device transmits torque to make the drill pipe rotate. The drill pipe is connected with the drill bit. The drill pipe drives the drill bit to rotate and cut soil and stones to form a borehole, a shaft, a wellbore, etc.

[0003] The existing drill pipe and drill bit are connected by bolts or hexagonal teeth. In the process of using the drilling assembly structure, the drill bit and the drill pipe are prone to falling off. In the construction process, due to improper operation, long-term use, or the influence of complex geology and other factors, the drill bit and the drill pipe will be broken, causing the drill bit to fall into the hole. At this time, the drill bit needs to be fished out from the bottom of the hole, otherwise it will affect further construction, delay the construction period, and cause economic losses. However, the fishing of the drill bit is very troublesome and time-consuming. At present, the fishing method of the drill bit is to use various fishing equipment to clamp the drill bit, and then lift the fishing equipment to take out the drill bit. However, the drill bit is broken in various ways, and the drill bit is most likely to be in an inclined and stuck state when it is broken. At the same time, there is a large amount of unremoved slag around the drill bit. This fishing method has low success rate, is difficult to fish, and is time-consuming and laborious, which increases the time cost and labor cost.

[0004] Since the existing drill bit is broken and falls off from the drill pipe, the fishing time of the drill bit is increased. SUMMARY

[0005] The present application provides a drilling rig drill bit anti-falling device and a drilling assembly structure to solve the technical problem of long fishing time of the drill bit when the existing drill bit and drill pipe are broken.

[0006] The first aspect of the embodiment of the present application provides a drilling rig drill bit anti-falling device, which comprises a first anti-falling structure, a second anti-falling structure, and at least one soft connecting piece.

[0007] The first anti-falling structure comprises a mounting seat and a rotating ring. The mounting seat is used to be fixed on the outer wall of the drill pipe. An annular mounting cavity is arranged on the mounting seat. The rotating ring is movably arranged in the annular mounting cavity. The center of the annular mounting cavity and the center of the rotating ring are both located on the axis of the drill pipe.

[0008] At least one first soft connecting part is arranged on the rotating ring. The second anti-falling structure comprises at least one second soft connecting part. The second soft connecting part is used to be fixed on the drill bit.

[0009] The side wall of the annular mounting cavity is provided with an opening, each first soft connection part passes through the opening and is connected to one end of each soft connecting piece, and the other end of each soft connecting piece is connected to each second soft connection part.

[0010] In the preferred technical solution of the drill bit anti-falling device, a rolling assembly is further included, and the rotating ring is rolling connected with the inner wall of the annular mounting cavity through the rolling assembly.

[0011] In the preferred technical solution of the drill bit anti-falling device, the mounting seat includes an annular base and an annular cover plate.

[0012] The inner ring of the annular base is used for sleeving on the outer wall of the drill rod, and the upper end of the annular base is provided with a first annular mounting groove matched with the rotating ring.

[0013] The annular cover plate covers the upper end of the annular base, and the lower end of the annular cover plate is provided with a second annular mounting groove matched with the rotating ring.

[0014] The first annular mounting groove and the second annular mounting groove are connected to form the annular mounting cavity.

[0015] In the preferred technical solution of the drill bit anti-falling device, the opening is arranged between the outer ring side wall of the first annular mounting groove and the outer ring side wall of the second annular mounting groove.

[0016] In the preferred technical solution of the drill bit anti-falling device, the rolling assembly includes a plurality of first rolling pieces and a plurality of second rolling pieces, the first rolling pieces are arranged between the rotating ring and the bottom wall of the first annular mounting groove, and the second rolling pieces are arranged between the rotating ring and the bottom wall of the second annular mounting groove.

[0017] In the preferred technical solution of the drill bit anti-falling device, the rolling assembly further includes a plurality of third rolling pieces, the inner ring side wall of the first annular mounting groove and the inner ring side wall of the second annular mounting groove are connected to form a contact side wall, and the third rolling pieces are arranged between the inner ring of the rotating ring and the contact side wall.

[0018] In the preferred technical solution of the drill bit anti-falling device, the rolling assembly further includes a plurality of fourth rolling pieces and a plurality of fifth rolling pieces, the fourth rolling pieces are arranged between the outer ring of the rotating ring and the outer ring side wall of the first annular mounting groove, and the fifth rolling pieces are arranged between the outer ring of the rotating ring and the outer ring side wall of the second annular mounting groove.

[0019] In the preferred technical scheme of the drill bit anti-falling device, the cross section of the rotating ring is cross-shaped.

[0020] In the preferred technical scheme of the drill bit anti-falling device, a fastener is further included, which sequentially passes through the annular cover plate and the annular base to fix the annular cover plate on the annular base.

[0021] The second aspect of the embodiments of the present application provides a drilling assembly structure, which comprises a drill pipe and a drill bit, the drill bit is fixed at one end of the drill pipe, and further comprises the drill bit anti-falling device, the drill pipe is connected with the drill bit through the drill bit anti-falling device.

[0022] The drill bit anti-falling device and the drilling assembly structure provided by the present application, wherein the drill bit anti-falling device comprises a first anti-falling structure, a second anti-falling structure and at least one soft connecting piece. The first anti-falling structure is used for being installed on the drill pipe, and the first anti-falling structure comprises a mounting seat and a rotating ring, wherein the mounting seat is fixed on the outer wall of the drill pipe, the annular mounting cavity is arranged on the mounting seat, and the center of the annular mounting cavity and the center of the rotating ring are located on the axis of the drill pipe. At least one first soft connecting part is arranged on the rotating ring, the second anti-falling structure comprises at least one second soft connecting part, the second soft connecting part is used for being fixed on the drill bit, one end of the soft connecting piece is connected with the first soft connecting part, and the other end is connected with the second soft connecting part. When the connection between the drill pipe and the drill bit is broken, the drill pipe is still connected with the power device for transmission, and the power device will drive the drill pipe to rotate at this time. The drill pipe will drive the annular mounting cavity to rotate when rotating, and the annular mounting cavity will move relative to the rotating ring because the rotating ring is movably arranged in the annular mounting cavity. Thus, the soft connecting piece can be prevented from generating a large torque between the drill pipe and the drill bit, and the soft connecting piece can be prevented from being wound and twisted off. Thus, after the connection between the drill bit and the drill pipe is broken, the drill bit will not fall off from the drill pipe, the phenomenon that the drill bit falls into the hole is prevented, and the time required for fishing the drill bit is saved. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate one embodiment consistent with the present application and, together with the description, serve to explain the principles of the application.

[0024] Figure 1 The structure schematic diagram of the drill bit anti-falling device provided by the embodiments of the present application is shown in the figure;

[0025] Figure 2 The local structure schematic diagram of the first anti-falling structure in the drill bit anti-falling device provided by the embodiments of the present application is shown in the figure;

[0026] Figure 3A top view angle structure schematic diagram of a drill pipe in a drilling tool assembly structure provided for an embodiment of the present application;

[0027] Figure 4 A top view angle structure schematic diagram of a drill bit in a drilling tool assembly structure provided for an embodiment of the present application.

[0028] Explanation of reference signs:

[0029] 100 - first anti-disengagement structure; 110 - annular mounting cavity; 111 - annular base; 112 - annular cover plate; 120 - rotating ring;

[0030] 200 - connecting structure;

[0031] 300 - soft connecting member;

[0032] 400 - first soft connecting part;

[0033] 500 - second soft connecting part;

[0034] 600 - opening;

[0035] 700 - rolling assembly; 710 - first rolling member; 720 - second rolling member; 730 - third rolling member; 740 - fourth rolling member; 750 - fifth rolling member;

[0036] 800 - first annular mounting groove;

[0037] 900 - second annular mounting groove;

[0038] 1000 - fastener;

[0039] 1100 - drill bit;

[0040] 1200 - drill pipe;

[0041] 1300 - rib plate;

[0042] 1400 - sealing gasket.

[0043] Through the above drawings, the specific embodiments of the present application have been shown, and will be described in more detail hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application by any means, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0044] The exemplary embodiments will be described in detail herein with reference to the attached drawings. In the following description, like reference numerals refer to like elements, unless the context clearly dictates otherwise. The following description is not intended to represent all embodiments in accordance with the present application. Rather, they merely represent typical embodiments in accordance with a portion of the application, as detailed in the appended claims. Based on the embodiments disclosed herein, one skilled in the art will appreciate that numerous other embodiments can be derived from the present disclosure without departing from the spirit and scope of the present application.

[0045] It should be noted that all directional indications, such as upper, lower, left, right, front, rear, etc., are merely used for convenience of description and are not intended to limit the application to a particular orientation. The above-mentioned and other objects and advantages of the application will become more apparent by describing in detail exemplary embodiments thereof, with reference made to the accompanying drawings.

[0046] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be internal connection of two elements, or interaction relationship between two elements, unless otherwise explicitly specified and limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0047] In addition, if the present application has a description involving "first", "second", etc., the description of "first", "second", etc. is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions. For example, "A and / or B" includes A solution, or B solution, or A and B solution. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art. When the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection claimed by the present application.

[0048] The existing drill pipe 1200 and drill bit 1100 are connected by bolts or hexagonal teeth, as shown in Figure 1As shown in the figure, the existing drill pipe 1200 and drill bit 1100 are connected through a connecting structure 200, which can be a bolt or a hexagonal tooth structure. During use, the drill bit 1100 and the drill pipe 1200 are prone to falling off. When the drill bit 1100 falls off, it needs to be fished out from the hole bottom, otherwise it will affect further construction. At present, various drill bit 1100 fishing equipment is used to fish out the drill bit 1100 from the hole bottom. The current fishing method has low success rate, is difficult to fish, time-consuming and laborious, and increases the time cost and labor cost.

[0049] The drill bit anti-falling device of the present application is provided with a first anti-falling structure 100 on the drill pipe 1200 and a second anti-falling structure on the drill bit 1100, and the first anti-falling structure 100 and the second anti-falling structure are connected through a soft connecting piece 300, which is a chain, a steel wire rope, etc. When the connection between the drill pipe 1200 and the drill bit 1100 is broken, the drill bit 1100 can be prevented from falling off. Moreover, when the connection between the drill pipe 1200 and the drill bit 1100 is broken, the upper drill pipe 1200 is still connected to the power device and rotates, while the lower drill bit 1100 has lost power and stops rotating. The first anti-falling structure 100 and the second anti-falling structure of the present application can prevent the soft connecting piece 300 from being wound and twisted off, so as to prevent the soft connecting piece 300 from being broken and the drill bit 1100 from falling off again after the connection between the drill pipe 1200 and the drill bit 1100 is broken. After the connection between the drill bit 1100 and the drill pipe 1200 is broken, the drill bit 1100 will not fall off from the drill pipe 1200, so that the drill bit 1100 can be taken out at the same time when the drill pipe 1200 is taken out from the hole, preventing the drill bit 1100 from falling into the hole after the connection between the drill pipe 1200 and the drill bit 1100 is broken, and saving the time needed to fish out the drill bit 1100. The specific structure and embodiments of the present application are described below.

[0050] In the embodiments of the present application, as shown in the figure, the first aspect of the embodiments of the present application provides a drill bit anti-falling device for a drilling machine, which comprises a first anti-falling structure 100, a second anti-falling structure and at least one soft connecting piece 300. Figures 1 to 4

[0051] The first anti-falling structure 100 comprises a mounting seat and a rotating ring 120. The mounting seat is used to be fixed on the outer wall of the drill pipe 1200, and an annular mounting cavity 110 is arranged on the mounting seat. The rotating ring 120 is movably arranged in the annular mounting cavity 110, and the center of the annular mounting cavity 110 and the center of the rotating ring 120 are located on the axis of the drill pipe 1200.

[0052] ​The rotating ring 120 is provided with at least one first soft connecting part 400, and the second anti-dropping structure comprises at least one second soft connecting part 500, and the second soft connecting part 500 is used for being fixed on the drill bit 1100.

[0053] The side wall of the annular mounting cavity 110 is provided with an opening 600, each first soft connecting part 400 is connected to one end of each soft connecting piece 300 in a one-to-one correspondence by partially penetrating through the opening 600, and the other end of each soft connecting piece 300 is connected to each second soft connecting part 500 in a one-to-one correspondence.

[0054] The first anti-dropping structure 100 of the present application is used for being mounted on the drill rod 1200, and the first anti-dropping structure 100 comprises a mounting seat and a rotating ring 120, wherein the mounting seat is fixed on the outer wall of the drill rod 1200, the mounting seat is provided with an annular mounting cavity 110, the rotating ring 120 is arranged in the annular mounting cavity 110, and the center of the annular mounting cavity 110 and the center of the rotating ring 120 are located on the axis of the drill rod 1200.

[0055] Since the rotating ring 120 can move relative to the annular mounting cavity 110, that is, the rotating ring 120 can move in the annular mounting cavity 110, for example, the rotating ring 120 is connected to the inner wall of the annular mounting cavity 110 in a sliding connection or a rolling connection, so that the rotating ring 120 can be movably arranged in the annular mounting cavity 110.

[0056] Specifically, for example, the rotating ring 120 is directly placed in the annular mounting cavity 110, and of course, in order to reduce the friction between the inner wall of the annular mounting cavity 110 and the rotating ring 120, when the materials of the annular mounting cavity 110 and the rotating ring 120 are selected, materials with low friction coefficient can be selected.

[0057] Of course, a lubricant or the like can also be added between the annular mounting cavity 110 and the rotating ring 120 to reduce the friction. For example, a rolling member, a sliding member or the like can be arranged between the annular mounting cavity 110 and the rotating ring 120 to reduce the friction between the annular mounting cavity 110 and the rotating ring 120, such as a ball roller, so that the rotating ring 120 can be movably arranged in the annular mounting cavity 110.

[0058] As shown in Figure 1 and Figure 2 The rotating ring 120 is provided with at least one first soft connecting part 400, and the first soft connecting part 400 is used for being connected to one end of the soft connecting piece 300. The specific structure of the first soft connecting part 400 is, for example, a buckle, a snap buckle or the like. When the first soft connecting part 400 is a plurality of first soft connecting parts 400, the plurality of first soft connecting parts 400 can be arranged circumferentially and uniformly on the rotating ring 120, so as to improve the stability of the force received by the rotating ring 120 and ensure that the force received by the rotating ring 120 is uniform.

[0059] AsFigure 4 As shown, the second anti-dropping structure of the present application comprises at least one second soft connecting part 500, which is used to be fixed on the drill bit 1100. The second soft connecting part 500 is used to be connected with the other end of the soft connecting member 300. The specific structure of the second soft connecting part 500 is, for example, a clasp, a buckle, etc. The structure of the second soft connecting part 500 can be the same as or different from that of the first soft connecting part 400. Similarly, when the second soft connecting part 500 is multiple, the multiple second soft connecting parts 500 can be arranged uniformly in the circumference on the drill bit 1100 to improve the stability of the force received by the drill bit 1100 and ensure that the drill bit 1100 receives force evenly.

[0060] Since the opening 600 is arranged on the side wall of the annular mounting cavity 110, each first soft connecting part 400 is connected to one end of each soft connecting member 300 in a one-to-one correspondence by partially penetrating the opening 600, and the other end of each soft connecting member 300 is connected to each second soft connecting part 500 in a one-to-one correspondence. The soft connecting member 300 can be a chain, a steel wire rope, a traction rope, etc.

[0061] When the connection between the drill rod 1200 and the drill bit 1100 is broken, the drill rod 1200 is still connected to the power device for transmission, and the power device will drive the drill rod 1200 to rotate at this time. If the drill rod 1200 is connected to the drill bit 1100 only through the soft connecting member 300, the power device will drive the drill rod 1200 to rotate at this time, thereby driving the soft connecting member 300 to rotate. Since the connection between the drill rod 1200 and the drill bit 1100 is broken at this time, the drill bit 1100 has lost power and will stop rotating at this time. At this time, the power device drives the drill rod 1200 to rotate, thereby driving the soft connecting member 300 to rotate. The soft connecting member 300 will be wound or even twisted off, thereby causing the drill bit 1100 to fall off the drill rod 1200 again, and further causing the drill bit 1100 to be fished out of the drill hole.

[0062] Therefore, one end of the soft connecting piece 300 is connected with the first soft connecting part 400, and the other end is connected with the second soft connecting part 500. The first soft connecting part 400 is fixed on the rotating ring 120, and the second soft connecting part 500 is fixed on the drill bit 1100. When the connection between the drill rod 1200 and the drill bit 1100 is broken, the drill rod 1200 is still connected with the power device for transmission, and the power device will drive the drill rod 1200 to rotate at this time. When the drill rod 1200 rotates, it will drive the annular mounting cavity 110 to rotate. Since the rotating ring 120 is movably arranged in the annular mounting cavity 110, at this time the annular mounting cavity 110 will move relative to the rotating ring 120. Since the first soft connecting part 400 is fixed on the rotating ring 120, and the first soft connecting part 400 is connected with one end of the soft connecting piece 300, and the other end of the soft connecting piece 300 is connected with the second soft connecting part 500, the soft connecting piece 300 can avoid generating a large torque between the drill rod 1200 and the drill bit 1100, and avoid winding or even breaking the soft connecting piece 300. Therefore, after the connection between the drill bit 1100 and the drill rod 1200 is broken, the drill bit 1100 will not fall off from the drill rod 1200. When the drill rod 1200 is taken out of the hole, the drill bit 1100 can be taken out through the soft connecting piece 300. The phenomenon that the drill bit 1100 falls into the hole after the connection between the drill rod 1200 and the drill bit 1100 is broken is prevented, and the time required to fish the drill bit 1100 is saved.

[0063] The rotating ring 120 can be movably arranged in the annular mounting cavity 110 in many ways, such as sliding connection, rolling connection, etc. between the rotating ring 120 and the inner wall of the annular mounting cavity 110, to realize the movable arrangement of the rotating ring 120 in the annular mounting cavity 110. For example, the rotating ring 120 can be directly placed in the annular mounting cavity 110, of course, a lubricant can be added between the annular mounting cavity 110 and the rotating ring 120 to reduce friction, or a rolling component or a sliding component can be arranged between the annular mounting cavity 110 and the rotating ring 120 to reduce the friction between the annular mounting cavity 110 and the rotating ring 120, so that the rotating ring 120 can be movably arranged in the annular mounting cavity 110.

[0064] In some possible embodiments, as shown in Figure 2 In some possible embodiments, as shown in

[0065] The mounting base is used for fixed connection with the drill pipe 1200, and only needs to ensure that the annular mounting cavity 110 can be arranged on the mounting base. In some possible embodiments, the mounting base comprises an annular base 111 and an annular cover plate 112. The inner ring of the annular base 111 is used for sleeving on the outer wall of the drill pipe 1200. The annular base 111 is provided with a first annular mounting groove 800 matched with the rotating ring 120 at the upper end. The annular cover plate 112 is covered on the upper end of the annular base 111. The annular cover plate 112 is provided with a second annular mounting groove 900 matched with the rotating ring 120 at the lower end. The first annular mounting groove 800 and the second annular mounting groove 900 are connected to form the annular mounting cavity 110.

[0066] In the embodiment, the annular mounting cavity 110 is formed by the first annular mounting groove 800 and the second annular mounting groove 900. The first annular mounting groove 800 is used for mounting the lower part of the rotating ring 120, and the second annular mounting groove 900 is used for mounting the upper part of the rotating ring 120. By covering the annular cover plate 112 on the annular base 111, the annular mounting cavity 110 can be formed, thereby facilitating the installation of the rotating ring 120.

[0067] The opening 600 enables the first soft connection part 400 to partially pass through the annular mounting cavity 110, so that the first soft connection part 400 can be connected with the soft connection piece 300. The opening 600 can be arranged at any position of the annular mounting cavity 110, as long as the rotating ring 120 can rotate in the annular mounting cavity 110.

[0068] In some possible embodiments, the opening 600 is arranged between the outer ring side wall of the first annular mounting groove 800 and the outer ring side wall of the second annular mounting groove 900. It should be noted that, at this time, the opening 600 surrounds the outer ring of the annular mounting cavity 110 for one turn.

[0069] In some possible embodiments, the rolling assembly 700 comprises a plurality of first rolling pieces 710 and a plurality of second rolling pieces 720. The first rolling pieces 710 are arranged between the rotating ring 120 and the bottom wall of the first annular mounting groove 800. The second rolling pieces 720 are arranged between the rotating ring 120 and the bottom wall of the second annular mounting groove 900.

[0070] The first rolling member 710 and the second rolling member 720 can be cylindrical rollers, ball rollers, pulleys, etc. In the present embodiment, the first rolling member 710 is arranged between the rotating ring 120 and the bottom wall of the first annular mounting groove 800, so that the rotating ring 120 is in rolling connection with the bottom wall of the first annular mounting groove 800, and the rotating ring 120 is movable in contact with the bottom wall of the annular mounting cavity 110. Similarly, the second rolling member 720 is arranged between the rotating ring 120 and the bottom wall of the second annular mounting groove 900, so that the rotating ring 120 is in rolling connection with the bottom wall of the second annular mounting groove 900, and the rotating ring 120 is movable in contact with the top wall of the annular mounting cavity 110.

[0071] In some possible embodiments, the rolling assembly 700 further comprises a plurality of third rolling members 730, the inner ring side wall of the first annular mounting groove 800 and the inner ring side wall of the second annular mounting groove 900 are connected to form a contact side wall, and the third rolling members 730 are arranged between the inner ring of the rotating ring 120 and the contact side wall. The third rolling member 730 can be a cylindrical roller, a ball roller, a pulley, etc. Similarly, the third rolling member 730 is arranged between the rotating ring 120 and the contact side wall, so that the rotating ring 120 is in rolling connection with the contact side wall, and the rotating ring 120 is movable in contact with the inner ring side wall of the annular mounting cavity 110.

[0072] In some possible embodiments, the rolling assembly 700 further comprises a plurality of fourth rolling members 740 and a plurality of fifth rolling members 750, the fourth rolling members 740 are arranged between the outer ring of the rotating ring 120 and the outer ring side wall of the first annular mounting groove 800, and the fifth rolling members 750 are arranged between the outer ring of the rotating ring 120 and the outer ring side wall of the second annular mounting groove 900. The fourth rolling member 740 and the fifth rolling member 750 can be a cylindrical roller, a ball roller, a pulley, etc. Similarly, the fourth rolling member 740 is arranged between the rotating ring 120 and the outer ring side wall of the first annular mounting groove 800, so that the rotating ring 120 is in rolling connection with the outer ring side wall of the first annular mounting groove 800, and the rotating ring 120 is movable in contact with the outer ring side wall of the annular mounting cavity 110. Furthermore, the fifth rolling member 750 is arranged between the rotating ring 120 and the outer ring side wall of the second annular mounting groove 900, so that the rotating ring 120 is in rolling connection with the outer ring side wall of the second annular mounting groove 900, and the rotating ring 120 is movable in contact with the outer ring side wall of the annular mounting cavity 110.

[0073] The shape of the cross section of the rotating ring 120 can be triangular, circular, polygonal, elliptical, etc. In the present embodiment, the cross section of the rotating ring 120 is cruciform, so as to facilitate the installation of the rolling assembly 700 between the rotating ring 120 and the inner wall of the annular mounting cavity 110.

[0074] The ring-shaped cover plate 112 can be attached to the upper end of the ring-shaped base 111 in various ways, such as by snapping onto the ring-shaped base 111. In the present embodiment, as shown in Figure 2 FIG. 1, a fastener 1000 is provided to sequentially pass through the ring-shaped cover plate 112 and the ring-shaped base 111 to secure the ring-shaped cover plate 112 to the ring-shaped base 111. The fastener 1000 can be a bolt, a screw, or the like.

[0075] In some possible embodiments, at least a reinforcing plate 1300 is provided at the lower end of the ring-shaped base 111, as shown in Figure 1 and Figure 2 The reinforcing plate 1300 can be added to the ring-shaped base 111 to more firmly secure the ring-shaped base 111 to the drill pipe 1200.

[0076] In some possible embodiments, a sealing gasket 1400 is provided between the ring-shaped base 111 and the ring-shaped cover plate 112, as shown in Figure 2 The sealing gasket 1400 is annular to prevent dust or sand from entering the annular mounting cavity 110.

[0077] A second aspect of the present application provides a drill assembly structure, which includes a drill pipe 1200 and a drill bit 1100 fixed to one end of the drill pipe 1200, and a drill bit anti-falling device. The drill pipe 1200 is connected to the drill bit 1100 through the drill bit anti-falling device. As shown in Figure 1 , Figure 3 and Figure 4 By using the drill assembly structure of the present application, the drill bit 1100 will not fall off the drill pipe 1200 after the connection between the drill pipe 1200 and the drill bit 1100 is broken, preventing the drill bit 1100 from falling into the hole and saving time for fishing the drill bit 1100.

[0078] The drill pipe 1200 has at least one sub drill pipe. When the drill pipe 1200 has multiple sub drill pipes, the sub drill pipes are connected through a connecting structure 200, which can be a bolt, a hexagonal tooth insert, a welding structure, or the like. The drill bit anti-falling device of the present application also connects one sub drill pipe to another sub drill pipe, i.e., a first anti-falling structure 100 is provided on the upper sub drill pipe, a second anti-falling structure is provided on the lower sub drill pipe, and the first anti-falling structure 100 is connected to the second anti-falling structure through at least one soft connecting member 300. When the connection between the sub drill pipes is broken, i.e., the connecting structure 200 is broken, the sub drill pipes will not fall off due to the combined action of the first anti-falling structure 100, the second anti-falling structure, and the soft connecting member 300, thereby ensuring that the drill bit 1100 will not fall off the drill pipe 1200.

[0079] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the application be construed as including any patern, process, or method inherently or expressly described herein that is within its true spirit and scope. It is intended that the specification and examples be considered exemplary only, with the true scope and spirit of the application indicated only by the following claims.

[0080] It is understood that the application is not limited to the precise construction herein disclosed and shown in the drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is limited only by the claims that follow.

Claims

1. A drill bit anti-drop device for a drilling rig, characterized in that, The first anti-falling structure, the second anti-falling structure and the at least one soft connecting piece are included. The first anti-falling structure includes a mounting seat and a rotating ring, the mounting seat is used for being fixed on the outer wall of the drill rod, an annular mounting cavity is arranged on the mounting seat, the rotating ring is movably arranged in the annular mounting cavity, and the center of the annular mounting cavity and the center of the rotating ring are located on the axis of the drill rod. The rotating ring is provided with at least one first soft connecting part, the second anti-falling structure includes at least one second soft connecting part, and the second soft connecting part is used for being fixed on the drill bit. An opening is arranged on the side wall of the annular mounting cavity, each first soft connecting part is connected to one end of each soft connecting piece through the opening in a one-to-one correspondence, and the other end of each soft connecting piece is connected to each second soft connecting part in a one-to-one correspondence.

2. The drill bit anti-drop device for a drilling rig according to claim 1, characterized in that, A rolling assembly is further included, and the rotating ring is rolling connected with the inner wall of the annular mounting cavity through the rolling assembly.

3. The drill bit anti-drop device for a drill rig of claim 2, wherein, The mounting seat includes an annular base and an annular cover plate. The inner ring of the annular base is used for being sleeved on the outer wall of the drill rod, a first annular mounting groove matched with the rotating ring is arranged on the upper end of the annular base. The annular cover plate is covered on the upper end of the annular base, and a second annular mounting groove matched with the rotating ring is arranged on the lower end of the annular cover plate. The first annular mounting groove and the second annular mounting groove are connected to form the annular mounting cavity.

4. The drill bit anti-drop device for a drill rig of claim 3, wherein, The opening is arranged between the outer ring side wall of the first annular mounting groove and the outer ring side wall of the second annular mounting groove.

5. The drill bit anti-drop device for a drill rig of claim 4, wherein, The rolling assembly includes a plurality of first rolling pieces and a plurality of second rolling pieces, the first rolling pieces are arranged between the rotating ring and the bottom wall of the first annular mounting groove, and the second rolling pieces are arranged between the rotating ring and the bottom wall of the second annular mounting groove.

6. The drill bit anti-drop device of claim 5, wherein, The rolling assembly further includes a plurality of third rolling pieces, the inner ring side wall of the first annular mounting groove and the inner ring side wall of the second annular mounting groove are connected to form a contact side wall, and the third rolling pieces are arranged between the inner ring of the rotating ring and the contact side wall.

7. The drill bit anti-drop device for a drill rig of claim 6, wherein, The rolling assembly further includes a plurality of fourth rolling pieces and a plurality of fifth rolling pieces, the fourth rolling pieces are arranged between the outer ring of the rotating ring and the outer ring side wall of the first annular mounting groove, and the fifth rolling pieces are arranged between the outer ring of the rotating ring and the outer ring side wall of the second annular mounting groove.

8. The drill bit anti-drop device of any one of claims 1 to 7, wherein, The cross section of the rotating ring is cross-shaped.

9. A drill bit retention assembly according to any one of claims 3 to 7, wherein, A fastener is further included, the fastener passes through the annular cover plate and the annular base in sequence to fix the annular cover plate on the annular base.

10. A drill assembly structure comprising a drill pipe and a drill bit, the drill bit being fixed to an end portion of the drill pipe, characterized by, A drill bit anti-falling device is further included, the drill rod is connected with the drill bit through the drill bit anti-falling device.

Images