A large-inclination angle inclined shaft anti-falling mechanism for reaming while drilling

Abstract

This invention relates to a fall prevention mechanism for reaming drill bits used in large-angle inclined well reverse drilling. It includes a drill bit connecting rod, with a reaming section detachably connected to the bottom end of the connecting rod via an installation part. A fall prevention mechanism is fixedly connected to the middle of the bottom end of the reaming section. The fall prevention mechanism includes a fall prevention vertical rod, the top end of which is fixedly connected to the middle of the bottom end of the reaming section. Several fall prevention horizontal rods are fixedly connected to the middle of the outer wall of the fall prevention vertical rod, and these horizontal rods are evenly spaced circumferentially along the middle of the outer wall of the fall prevention vertical rod. Each horizontal rod contains a fall prevention drive part. A circular slot is formed inside the fall prevention vertical rod, and a fall prevention response part is movably disposed within the slot. The fall prevention drive part and the fall prevention response part are correspondingly arranged. Several fall prevention actuators are located at the bottom of the outer wall of the fall prevention vertical rod, with each actuator corresponding to one of the drive and actuators. This invention can prevent the drill bit from falling into the lower tunnel of the reverse well and causing secondary damage, effectively improving construction safety.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of drilling equipment, and particularly relates to a large-inclination-angle inclined shaft reverse-well drilling reaming bit anti-falling mechanism. BACKGROUND

[0002] Reaming drilling is a large-volume rock breaking process of a reverse-well drilling machine. A main shaft of a power head of the reverse-well drilling machine drives a drill rod to rotate to apply a torsional moment to a drill bit, and applies upward lifting force of a pushing cylinder to the drill bit to form a drilling pressure. The two forces together transmit the rock breaking energy to a reamer arranged on the drill bit body, and the reamer rotates around its cutter shaft. The reaming bit breaks down rocks from a rock mass to form a reverse-well borehole, and is mainly composed of a reamer, a cutter seat, a drill bit body, a central pipe and the like, and needs to meet the process requirements of high-efficiency rock breaking, rock residue removal and auxiliary dust reduction. The drill rod is a hollow shaft structure used to transmit axial force and torsional moment and to transport well flushing medium. The drill rod is provided with an internal conical thread and an external conical thread at two ends thereof, and two drill rods are connected to each other through an offset trapezoidal thread. During the reaming drilling of the reverse-well drilling machine, the drill rod not only bears great tension and torsion, but also bears additional moment caused by unbalanced operation, and drill rod fracture accidents occur from time to time. Drill rod fracture includes rod body fracture, external thread fracture and internal thread fracture, and the reasons include drill rod material, processing technology, detection and inspection, drill rod storage and drill rod use. In field application, the drill rod fracture position is mostly located at the tooth root of the external thread close to the shoulder. Observation shows that there are obvious smooth and rough zones at the fracture, which indicates that the fracture is mainly caused by fatigue damage. After the drill rod is fractured, the drill rod and the reaming bit below the fractured position will directly fall into the reverse-well lower opening roadway, and the huge impact momentum will cause secondary damage to the drilling tools and is difficult to handle, which seriously affects the construction safety. Therefore, it is necessary to design a large-inclination-angle inclined shaft reverse-well drilling reaming bit anti-falling mechanism to solve the above problems. SUMMARY

[0003] The application aims to provide a large-inclination-angle inclined shaft reverse-well drilling reaming bit anti-falling mechanism to solve the above problems, avoid the secondary damage of the huge impact momentum to the drilling tools when the reaming bit falls into the reverse-well lower opening roadway, and effectively improve the safety of construction.

[0004] To achieve the above-mentioned purpose, the application provides the following solution: a large-inclination-angle inclined shaft reverse-well drilling reaming bit anti-falling mechanism, comprising a drill bit connecting rod, a reaming part being detachably connected to the bottom end of the drill bit connecting rod through a mounting part, and an anti-falling mechanism being fixedly connected to the middle of the bottom end of the reaming part.

[0005] The anti-falling mechanism comprises an anti-falling vertical rod, the top end of the anti-falling vertical rod is fixedly connected with the middle part of the bottom end of the hole expanding part, a plurality of anti-falling horizontal rods are fixedly connected with the middle part of the outer side wall of the anti-falling vertical rod, the plurality of anti-falling horizontal rods are arranged at equal intervals along the middle part of the outer side wall of the anti-falling vertical rod, an anti-falling driving part is arranged in each anti-falling horizontal rod, a circular through slot is formed in the anti-falling vertical rod, an anti-falling response part is movably arranged in the circular through slot, the anti-falling driving part and the anti-falling response part are correspondingly arranged, a plurality of anti-falling execution parts are arranged at the bottom of the outer side wall of the anti-falling vertical rod, the anti-falling execution parts correspond to the anti-falling driving parts in one-to-one correspondence, and the anti-falling execution parts are correspondingly arranged with the anti-falling response part.

[0006] Preferably, a sliding groove is formed in one end of the anti-falling horizontal rod away from the anti-falling vertical rod, the anti-falling driving part comprises a sliding block, the sliding block is vertically and slidably arranged in the sliding groove, one end of the sliding block is located outside the sliding groove, the other end of the sliding block is fixedly connected with an anti-coming-off block, the anti-coming-off block is slidably arranged in the sliding groove, a horizontal sliding rod is horizontally and slidably arranged in the anti-falling horizontal rod, an inclined surface is formed in one end of the horizontal sliding rod located in the sliding groove, the inclined surface is downwardly inclined, the other end of the horizontal sliding rod is fixedly connected with an elastic part and correspondingly arranged with the anti-falling response part.

[0007] Preferably, a plurality of third accommodating grooves are formed in the anti-falling vertical rod, the third accommodating grooves are communicated with the circular through slot, the end of the horizontal sliding rod is slidably arranged in the third accommodating groove, the elastic part comprises a second spring, one end of the second spring is fixedly connected with the side wall of the third accommodating groove, the other end of the second spring is fixedly connected with the end of the horizontal sliding rod, an insertion rod through hole is formed in the end of the horizontal sliding rod close to the second spring, and the anti-falling response part is correspondingly arranged with the insertion rod through hole.

[0008] Preferably, the anti-falling response part comprises a first spring, the first spring is arranged in the circular through slot, one end of the first spring is fixedly connected with the top wall of the circular through slot, the other end of the first spring is fixedly connected with the top end of an upper sliding ring, the upper sliding ring is slidably arranged in the circular through slot, the bottom end of the upper sliding ring is fixedly connected with a plurality of vertical insertion rods, the plurality of vertical insertion rods are arranged at equal intervals along the circumference of the upper sliding ring and are slidably arranged in the circular through slot, the vertical insertion rods correspond to the insertion rod through holes in one-to-one correspondence, one end of a third spring is fixedly connected with the bottom wall of the circular through slot, the other end of the third spring is fixedly connected with a lower sliding ring, and the lower sliding ring is slidably arranged in the annular groove formed in the outer side wall of the anti-falling vertical rod.

[0009] Preferably, the anti-falling executing part comprises two horizontally arranged horizontal connecting rods, the close ends of the two horizontal connecting rods are fixedly connected with the outer side wall of the anti-falling vertical rod, and a long through hole is formed in the middle of each horizontal connecting rod.

[0010] Preferably, the anti-falling fixing part comprises an anti-falling insertion rod, one end of the anti-falling insertion rod is rotatably connected with a hinged seat through a hinge shaft, the hinged seat is fixedly connected with the outer side wall of the lower sliding ring, two symmetrically arranged limiting connecting rods are fixedly connected with the outer side wall of the middle of the anti-falling insertion rod, the limiting connecting rods are movably arranged in the long through hole, and the other end of the anti-falling insertion rod is provided as a pointed end.

[0011] Preferably, the reaming part comprises a center table, a plurality of first fixed rods and a plurality of second fixed rods are fixedly connected with the outer side wall of the center table and arranged horizontally, the first fixed rods are arranged at intervals from the second fixed rods, an arc-shaped connecting rod is fixedly connected between the first fixed rod and the adjacent second fixed rod, a plurality of first cutting knives are fixedly connected with the top end of the first fixed rod and arranged at equal intervals, a plurality of second cutting knives are fixedly connected with the top end of the second fixed rod and arranged at equal intervals, the first cutting knives and the second cutting knives are arranged alternately, and the first fixed rods, the second fixed rods and the center table are detachably installed at the bottom end of the drill bit connecting rod.

[0012] Preferably, a first accommodating groove is formed in the middle of the bottom end of the drill bit connecting rod, the first accommodating groove is matched with the center table, a plurality of second accommodating grooves are formed in the outer side wall of the first accommodating groove and arranged at equal intervals, the second accommodating grooves are matched with the first fixed rods and the second fixed rods, and a clearance groove is formed in the two opposite side walls of the second accommodating groove.

[0013] Compared with the prior art, the present application has the following advantages and technical effects:

[0014] The installation part can conveniently and quickly install the reaming part at the bottom end of the drill bit connecting rod, the anti-falling driving part arranged in the anti-falling horizontal rod can generate a driving action in the process of the drill bit falling, drive the anti-falling responding part arranged in the anti-falling vertical rod, transmit the action to the anti-falling executing part after the anti-falling responding part is driven, and start the action of the anti-falling executing part to block the drill bit falling process, prevent the drill bit from falling into the anti-inferior well opening tunnel to cause secondary damage, and effectively improve the construction safety. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative effort:

[0016] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0017] Figure 2 It is a sectional view of the present application;

[0018] Figure 3 It is Figure 2 a partial enlarged view of A in the middle;

[0019] Figure 4 It is Figure 2 a partial enlarged view of B in the middle;

[0020] Figure 5 It is Figure 2 a partial enlarged view of C in the middle;

[0021] Figure 6 It is Figure 2 a partial enlarged view of D in the middle;

[0022] Figure 7 It is a top view of the present application;

[0023] Figure 8 It is a schematic diagram of the bottom end of the drill connecting rod of the present application;

[0024] Figure 9 It is Figure 8 a sectional view of E-E in the middle;

[0025] Figure 10 It is an axis measurement drawing of the connection between the upper sliding ring and the vertical insertion rod of the present application;

[0026] Figure 11 It is a schematic diagram of the second embodiment of the present application.

[0027] Wherein, 1, drill bit connecting rod; 2, first fixed rod; 3, second fixed rod; 4, first cutting knife; 5, second cutting knife; 6, anti-falling vertical rod; 7, anti-falling horizontal rod; 8, sliding block; 9, horizontal connecting rod; 10, anti-falling plug rod; 11, first containing groove; 12, second containing groove; 13, let go of the slot; 14, hinged baffle; 15, round through slot; 16, first spring; 17, upper sliding ring; 18, vertical plug rod; 19, horizontal sliding rod; 20, plug rod through hole; 21, second spring; 22, third containing groove; 23, sliding groove; 24, anti-dropping block; 25, limit connecting rod; 26, long through hole; 27, ring groove; 28, third spring; 29, lower sliding ring; 30, hinged seat; 31, hinged shaft; 32, center table; 33, arc-shaped connecting rod; 34, anti-falling ball. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0029] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0030] Embodiment one:

[0031] With reference to Figures 1-10 The embodiment provides a large-inclination angle inclined shaft anti-well drilling reaming drill bit anti-falling mechanism, which comprises a drill bit connecting rod 1, the bottom end of the drill bit connecting rod 1 is detachably connected with a reaming part through a mounting part, and the bottom end of the reaming part is fixedly connected with an anti-falling mechanism in the middle part.

[0032] The anti-falling mechanism comprises an anti-falling vertical rod 6, the top end of the anti-falling vertical rod 6 is fixedly connected with the bottom end of the reaming part in the middle part, a plurality of anti-falling horizontal rods 7 are fixedly connected with the outer side wall of the anti-falling vertical rod 6 in the middle part, the plurality of anti-falling horizontal rods 7 are arranged at equal intervals in the circumferential direction of the outer side wall of the anti-falling vertical rod 6, each anti-falling horizontal rod 7 is provided with an anti-falling driving part, a round through slot 15 is formed in the anti-falling vertical rod 6, an anti-falling response part is movably arranged in the round through slot 15, the anti-falling driving part and the anti-falling response part are correspondingly arranged, a plurality of anti-falling execution parts are arranged on the bottom of the outer side wall of the anti-falling vertical rod 6, the anti-falling execution parts correspond to the anti-falling driving parts one by one, and the anti-falling execution parts are correspondingly arranged with the anti-falling response parts.

[0033] The mounting portion is arranged to facilitate and expedite the mounting of the reaming portion at the bottom end of the drill bit connecting rod 1, and the anti-falling driving portion arranged in the anti-falling horizontal rod 7 can generate a driving action during the falling of the drill bit, drive the anti-falling response portion arranged in the anti-falling vertical rod 6, and after the anti-falling response portion is driven, the action is transmitted to the anti-falling execution portion, the anti-falling execution portion starts to act to block the falling process of the drill bit, prevents the drill bit from falling into the anti-inferior mouth roadway to cause secondary damage, and effectively improves the construction safety.

[0034] Further optimization scheme, the end of the anti-falling horizontal rod 7 away from the anti-falling vertical rod 6 is provided with a sliding groove 23, the anti-falling driving portion includes a sliding block 8, the sliding block 8 is vertically slidably arranged in the sliding groove 23, one end of the sliding block 8 is located outside the sliding groove 23, the other end of the sliding block 8 is fixedly connected with an anti-falling block 24, the anti-falling block 24 is slidably arranged in the sliding groove 23, a horizontal sliding rod 19 is horizontally slidably arranged in the anti-falling horizontal rod 7, one end of the horizontal sliding rod 19 located in the sliding groove 23 is provided with an inclined surface, the inclined surface is inclined downward, the other end of the horizontal sliding rod 19 is fixedly connected with an elastic portion and is correspondingly arranged with the anti-falling response portion.

[0035] The end of the sliding block 8 located outside the sliding groove 23 is flush with the end of the reaming portion, and during the process of reverse well drilling, the drill bit gradually rises from bottom to top, the end of the sliding block 8 located outside the sliding groove 23 contacts the sidewall of the well during the rising process, under the action of friction, the sliding block 8 is always located at the bottom of the sliding groove 23, when the drill bit falls during the drilling process, the sliding block 8 slides to the top of the sliding groove 23 under the friction of the well wall and contacts the inclined surface of the horizontal sliding rod 19, which generates extrusion on the horizontal sliding rod 19, so that the horizontal sliding rod 19 slides towards the anti-falling vertical rod 6, after sliding in place, the anti-falling response portion generates action and acts on the anti-falling execution portion, the anti-falling execution portion starts to act to prevent the drill bit from falling further.

[0036] Further optimization scheme, the anti-falling vertical rod 6 is internally provided with a plurality of third accommodating grooves 22, the third accommodating grooves 22 are communicated with the circular through groove 15, the end of the horizontal sliding rod 19 is slidably arranged in the third accommodating groove 22, the elastic portion includes a second spring 21, one end of the second spring 21 is fixedly connected with the sidewall of the third accommodating groove 22, the other end of the second spring 21 is fixedly connected with the end of the horizontal sliding rod 19, the end of the horizontal sliding rod 19 close to the second spring 21 is provided with a plug rod through hole 20, and the anti-falling response portion is correspondingly arranged with the plug rod through hole 20.

[0037] After the horizontal sliding rod 19 slides to the position close to the anti-falling vertical rod 6, the plug rod through hole 20 is aligned with the anti-falling response portion, the anti-falling response portion generates action and slides downward to act on the anti-falling execution portion, so that the anti-falling execution portion plays a role in preventing the drill bit from falling.

[0038] The scheme is further optimized. The fall protection response unit includes a first spring 16, which is disposed in a circular through groove 15. One end of the first spring 16 is fixedly connected to the top wall of the circular through groove 15, and the other end of the first spring 16 is fixedly connected to the top of an upper sliding ring 17. The upper sliding ring 17 is slidably disposed in the circular through groove 15. Several vertical insert rods 18 are fixedly connected to the bottom end of the upper sliding ring 17. The several vertical insert rods 18 are equally spaced along the circumference of the upper sliding ring 17 and slidably disposed in the circular through groove 15. The vertical insert rods 18 correspond one-to-one with the insert rod through holes 20. One end of a third spring 28 is fixedly connected to the bottom wall of the circular through groove 15, and the other end of the third spring 28 is fixedly connected to a lower sliding ring 29. The lower sliding ring 29 is slidably disposed in the annular groove 27 opened on the outer wall of the fall protection vertical rod 6.

[0039] In the initial state, the end of the horizontal slide bar 19 limits the upper slide ring 17 and the vertical insert rod 18, causing the first spring 16 to be in a compressed state. When the horizontal slide bar 19 moves to the insert rod through hole 20 and aligns with the vertical insert rod 18, the upper slide ring 17 and the vertical insert rod 18 are no longer blocked by the limit. At this time, the first spring 16 returns to its original length, and at the same time, the upper slide ring 17 and the vertical insert rod 18 slide downward together until the bottom end of the vertical insert rod 18 acts on the lower slide ring 29. The lower slide ring 29 begins to move downward and drives the anti-fall actuator to produce an action.

[0040] The scheme is further optimized. The anti-fall actuator includes two horizontal connecting rods 9 arranged in parallel. The ends of the two horizontal connecting rods 9 that are close to each other are fixedly connected to the outer wall of the anti-fall vertical rod 6. Each horizontal connecting rod 9 has a long through hole 26 in the middle. The two long through holes 26 are movably arranged with an anti-fall fixing part. The end of the anti-fall fixing part is fixedly connected to the outer wall of the sliding ring 29.

[0041] The design is further optimized so that the anti-fall fixing part includes an anti-fall rod 10. One end of the anti-fall rod 10 is rotatably connected to a hinge seat 30 through a hinge shaft 31. The hinge seat 30 is fixedly connected to the outer wall of the sliding ring 29. Two symmetrically arranged limiting rods 25 are fixedly connected to the outer wall of the middle part of the anti-fall rod 10. The limiting rods 25 are movably arranged in the long through hole 26. The other end of the anti-fall rod 10 is set as a pointed tip.

[0042] As the sliding ring 29 moves downward, it drives the ends of the hinge seat 30 and the anti-fall rod 10 to move downward simultaneously. Since the limiting link 25 is movably set in the long through hole 26, as the ends of the hinge seat 30 and the anti-fall rod 10 move downward simultaneously, the tip of the anti-fall rod 10 moves away from the anti-fall vertical rod 6 and finally inserts into the side wall of the raised well, thus realizing the anti-fall function of the drill bit.

[0043] The design is further optimized so that the hole-reaming section includes a center platform 32. Several first fixing rods 2 and several second fixing rods 3 are fixedly connected to the outer wall of the center platform 32. The first fixing rods 2 and the second fixing rods 3 are spaced apart. An arc-shaped connecting rod 33 is fixedly connected between the first fixing rod 2 and the adjacent second fixing rod 3. Several first cutting blades 4 are fixedly connected to the top of the first fixing rod 2 at equal intervals. Several second cutting blades 5 are fixedly connected to the top of the second fixing rod 3 at equal intervals. The several first cutting blades 4 and the several second cutting blades 5 are staggered. The first fixing rods 2, the second fixing rods 3, and the center platform 32 are detachably installed at the bottom of the drill bit connecting rod 1.

[0044] After the first fixing rod 2, the second fixing rod 3, and the center platform 32 are installed at the bottom of the drill bit connecting rod 1, the drilling equipment on the ground (not shown in the figure) drives the drill bit connecting rod 1 to rotate continuously, and at the same time drives the first cutting blade 4 at the top of the first fixing rod 2 and the second cutting blade 5 at the top of the second fixing rod 3 to rotate continuously, cutting the soil layer and realizing the reverse drilling process.

[0045] In a further optimized design, a first receiving groove 11 is provided at the bottom center of the drill bit connecting rod 1. The first receiving groove 11 is adapted to the center platform 32. Several second receiving grooves 12 are provided at equal intervals on the outer side wall of the first receiving groove 11. The second receiving grooves 12 are adapted to the first fixing rod 2 and the second fixing rod 3. The two opposite side walls of the second receiving grooves 12 are respectively provided with clearance grooves 13. The bottom wall of one clearance groove 13 is rotatably connected to the bottom end of a hinge baffle 14. The other end of the hinge baffle 14 is movably disposed in another clearance groove 13.

[0046] During installation, align the first fixing rod 2 and the second fixing rod 3 with the second receiving groove 12, and then control the drill bit connecting rod 1 to move downward. During the movement, the first fixing rod 2 and the second fixing rod 3 push open the hinge baffle 14 in the second receiving groove 12. Then the drill bit connecting rod 1 continues to move downward, and the hinge baffle 14 automatically resets, completing the installation and connection of the first fixing rod 2, the second fixing rod 3 and the drill bit connecting rod 1.

[0047] Example 2:

[0048] Reference Figure 11 The only difference between this embodiment and Embodiment 1 is that the tip of the anti-falling rod 10 is changed to a horizontal end, and a thread is opened on its outer side wall. The anti-falling ball 34 is detachably connected through the thread. In this embodiment, when the reverse drilling operation is carried out in a rock layer, the tip of the anti-falling rod 10 cannot be smoothly inserted into the side wall of the rock well. At this time, the tip is replaced with the anti-falling ball 34. When the drill bit falls, the anti-falling ball 34 can fix the drill bit by relying on the friction with the rock wall to prevent the drill bit from falling further.

[0049] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0050] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A fall prevention mechanism for a drill bit used in reverse drilling and reaming of a large-angle inclined well, characterized in that, It includes a drill bit connecting rod (1), the bottom end of which is detachably connected to a hole-enlarging part via an installation part, and a fall-prevention mechanism is fixedly connected to the middle of the bottom end of the hole-enlarging part; The fall protection mechanism includes a fall protection vertical rod (6), the top of which is fixedly connected to the middle of the bottom of the enlarged hole. A plurality of fall protection horizontal rods (7) are fixedly connected to the middle of the outer side wall of the fall protection vertical rod (6). The plurality of fall protection horizontal rods (7) are evenly spaced along the middle of the outer side wall of the fall protection vertical rod (6). Each fall protection horizontal rod (7) is provided with a fall protection driving part. A circular through groove (15) is opened inside the fall protection vertical rod (6). A fall protection response part is movably arranged in the circular through groove (15). The fall protection driving part and the fall protection response part are arranged correspondingly. A plurality of fall protection execution parts are arranged at the bottom of the outer side wall of the fall protection vertical rod (6). The fall protection execution parts correspond one-to-one with the fall protection driving parts. The fall protection execution parts and the fall protection response parts are arranged correspondingly. The anti-fall horizontal bar (7) has a groove (23) at one end away from the anti-fall vertical bar (6). The anti-fall driving part includes a sliding block (8). The sliding block (8) is vertically slidably disposed in the groove (23). One end of the sliding block (8) is located outside the groove (23). The other end of the sliding block (8) is fixedly connected to an anti-detachment block (24). The anti-detachment block (24) is slidably disposed in the groove (23). A horizontal sliding rod (19) is horizontally slidably disposed inside the anti-fall horizontal bar (7). One end of the horizontal sliding rod (19) located in the groove (23) has an inclined surface. The inclined surface is inclined downward. The other end of the horizontal sliding rod (19) is fixedly connected to an elastic part and is disposed corresponding to the anti-fall response part. The fall arresting vertical rod (6) has several third receiving grooves (22) inside. The third receiving grooves (22) are connected to the circular through groove (15). The end of the horizontal slide rod (19) is slidably disposed in the third receiving groove (22). The elastic part includes a second spring (21). One end of the second spring (21) is fixedly connected to the side wall of the third receiving groove (22). The other end of the second spring (21) is fixedly connected to the end of the horizontal slide rod (19). The end of the horizontal slide rod (19) near the second spring (21) has a rod insertion through hole (20). The fall arresting response part is correspondingly disposed with the rod insertion through hole (20).

2. The anti-fall mechanism for a drill bit used in large-angle inclined well reverse drilling and reaming as described in claim 1, characterized in that, The fall protection response unit includes a first spring (16), which is disposed in the circular through groove (15). One end of the first spring (16) is fixedly connected to the top wall of the circular through groove (15), and the other end of the first spring (16) is fixedly connected to the top of an upper sliding ring (17). The upper sliding ring (17) is slidably disposed in the circular through groove (15). The bottom end of the upper sliding ring (17) is fixedly connected to a plurality of vertical insert rods (18). The plurality of vertical insert rods (18) are equally spaced along the circumference of the upper sliding ring (17) and slidably disposed in the circular through groove (15). The vertical insert rods (18) correspond one-to-one with the insert rod through holes (20). One end of a third spring (28) is fixedly connected to the bottom wall of the circular through groove (15), and the other end of the third spring (28) is fixedly connected to a lower sliding ring (29). The lower sliding ring (29) is slidably disposed in the annular groove (27) opened on the outer side wall of the fall protection vertical rod (6).

3. The anti-fall mechanism for a large-angle inclined well reverse drilling reaming drill bit according to claim 2, characterized in that, The fall arrestor includes two horizontal connecting rods (9) arranged in parallel. The ends of the two horizontal connecting rods (9) are fixedly connected to the outer wall of the fall arrestor vertical rod (6). Each horizontal connecting rod (9) has a long through hole (26) in the middle. A fall arrestor fixing part is movably arranged in the two long through holes (26). The end of the fall arrestor fixing part is fixedly connected to the outer wall of the sliding ring (29).

4. The anti-fall mechanism for a large-angle inclined well reverse drilling reaming drill bit according to claim 3, characterized in that, The fall arresting fixing part includes a fall arresting rod (10). One end of the fall arresting rod (10) is rotatably connected to a hinge seat (30) via a hinge shaft (31). The hinge seat (30) is fixedly connected to the outer wall of the sliding ring (29). Two symmetrically arranged limiting rods (25) are fixedly connected to the outer wall of the middle part of the fall arresting rod (10). The limiting rods (25) are movably arranged in the long through hole (26). The other end of the fall arresting rod (10) is set as a pointed tip.

5. The anti-fall mechanism for a drill bit used in large-angle inclined well reverse drilling and reaming as described in claim 1, characterized in that, The enlarged hole section includes a central platform (32). Several first fixing rods (2) and several second fixing rods (3) are fixedly connected to the outer wall of the central platform (32). The first fixing rods (2) and the second fixing rods (3) are spaced apart. An arc-shaped connecting rod (33) is fixedly connected between the first fixing rod (2) and the adjacent second fixing rod (3). Several first cutting blades (4) are fixedly connected to the top of the first fixing rod (2) at equal intervals. Several second cutting blades (5) are fixedly connected to the top of the second fixing rod (3) at equal intervals. Several first cutting blades (4) and several second cutting blades (5) are staggered. The first fixing rods (2), the second fixing rods (3), and the central platform (32) are detachably installed at the bottom of the drill bit connecting rod (1).

6. The anti-fall mechanism for a large-angle inclined well reverse drilling reaming drill bit according to claim 5, characterized in that, The drill bit connecting rod (1) has a first receiving groove (11) at the bottom center, which is adapted to the center platform (32). The outer side wall of the first receiving groove (11) has several equally spaced second receiving grooves (12). The second receiving grooves (12) are adapted to the first fixing rod (2) and the second fixing rod (3). The two opposite side walls of the second receiving groove (12) are respectively provided with relief grooves (13). The bottom wall of one relief groove (13) is rotatably connected to the bottom end of a hinge baffle (14). The other end of the hinge baffle (14) is movably disposed in another relief groove (13).

Images