Reverse circulation drill bit

Abstract

The utility model belongs to the field of drill bits, and particularly relates to a reverse circulation drill bit which comprises a drill bit body, the drill bit body comprises a main rod, and the top of the main rod is communicated with an ejector rod. Rock breaking work is conducted through the main rod, the ejector rod and the cutting teeth, the second meshing plate and the first meshing plate rotate outwards under the pressure of mud rock, then the effect of smoothly conveying the mud rock can be achieved, on the contrary, after mud conveying is completed, the second meshing plate and the first meshing plate lose force, and the mud rock is broken. And then the limiting block restores to the original position under the action of the spring, and the two sides of the thin ring are stored in the inner cavity of the shell, so that the effect of preventing the slurry in the inner cavities of the main rod and the ejector rod from flowing back is achieved, and the problem that in the using process of an existing reverse circulation drill bit, an operator can convey the slurry to a drill bit part through a slurry pump, and operation is inconvenient is solved. And a large amount of slurry remained in the drill bit still has a reverse flow phenomenon under the action of gravity.

Description

Technical Field

[0001] The utility model relates to the field of drill bits, in particular to a reverse circulation drill bit. Background Art

[0002] Reverse circulation drill, also called reverse circulation drill, is a drill specially used for reverse drilling. Traditional drill can only drill in clockwise direction, while reverse circulation drill can drill in counterclockwise direction, which can be used for special processing or repair work.

[0003] However, during the use of existing reverse circulation drill bits, operators can rely on mud pumps to transport mud to the drill head, using the pressure and flow of the mud to flush small pieces of rock out of the hole and out of the ground. However, a large amount of mud remaining inside the drill bit will still flow back under the action of gravity, which will affect the working efficiency of the drill bit. Utility Model Content

[0004] In order to make up for the shortcomings of the prior art, the mud generated when the drill bit is working may flow back under the action of gravity. The utility model provides a reverse circulation drill bit.

[0005] The utility model solves the technical problem by adopting the following technical solution: a reverse circulation drill bit, comprising a drill bit body, the drill bit body comprising a main rod, the top of the main rod is connected with a mandrel, the top of the mandrel is fixedly connected with cutting teeth, the number of the cutting teeth is multiple, and the inner cavity of the mandrel is provided with a backflow prevention mechanism;

[0006] The anti-backflow mechanism includes an outer ring, the surface of the outer ring is installed on the top of the inner cavity of the push rod, the inner cavity of the outer ring is movably connected with a rotating plate, the bottom of the inner side of the rotating plate is fixedly connected with a connecting plate, the bottom of the connecting plate is respectively fixedly connected with meshing plate 2 and meshing plate 1, the two sides of the meshing plate 2 are movably connected to the two sides of the meshing plate 1, the bottom of the outer side of the meshing plate 1 is fixedly connected with an outer shell, both sides of the inner cavity of the outer shell are movably connected with thin rings, the center of the surface of the thin ring is fixedly connected with a connecting ring, and the inner side of the connecting ring is fixedly connected to the bottom of the outer side of the meshing plate 2.

[0007] Preferably, the inner cavity of the outer ring is fixedly connected with a rotating shaft, the number of the rotating shafts is multiple, and the surface of the rotating shaft is movably connected to the inner cavity of the rotating plate.

[0008] Preferably, the meshing plate 2 and the meshing plate 1 are both arranged in an arc-shaped structure, and 60 is an angle, the meshing plate 2 and the meshing plate 1 are staggered, and the meshing plate 2 and the meshing plate 1 are arranged in a conical structure as a whole.

[0009] Preferably, both sides of the thin ring are fixedly connected to limit blocks, the surface of the limit blocks is movably connected to the inner cavity of the shell, the diameter of the limit blocks is larger than the diameter of the thin ring, and the limit blocks are arranged in a circular structure.

[0010] Preferably, springs are sleeved on both sides of the surface of the thin ring, the outer side of the spring is fixedly connected to the inner side of the limit block, and the inner side of the spring is fixedly connected to the inner cavity of the shell.

[0011] Preferably, mounting plates are fixedly connected around the top of the outer ring, bolts are installed in the inner cavity of the mounting plates, and the bottom of the mounting plates is fixedly connected to the top of the push rod by bolts.

[0012] Preferably, mounting holes are provided around the top of the inner cavity of the push rod, the mounting holes are arranged in a circular structure, and the bottom of the bolt surface is movably connected to the inner cavity of the mounting hole.

[0013] The utility model is beneficial in that:

[0014] The utility model performs rock breaking work through the main rod, the top rod and the cutting teeth, and transports the mud to the main rod through the mud rock. When the mud rock is transported, the meshing plate two and the meshing plate one rotate outward under the pressure of the mud rock, and then the meshing plate one and the meshing plate two rotate to make the thin ring slide in the inner cavity of the outer shell, so that the diameter between the thin ring and the outer shell gradually increases, and then the bottom of the meshing plate one and the meshing plate two is in an open state, so that the mud rock can be smoothly transported. On the contrary, when the mud rock is transported, the meshing plate two and the meshing plate one lose their strength, so that the connecting plate and the rotating plate are in the outer ring The inner cavity of the main rod rotates, and then the limit block returns to its original position under the action of the spring, and the two sides of the thin ring are retracted into the inner cavity of the shell, thereby achieving the effect of closing the meshing plate 1 and the meshing plate 2, thereby achieving the effect of preventing the backflow of mud in the inner cavity of the main rod and the top rod, solving the problem that during the use of the existing reverse circulation drill bit, the operator can rely on the mud pump to transport mud to the drill head, and use the pressure and flow of the mud to flush small pieces of rock out of the hole and out of the ground, while the large amount of mud remaining in the drill bit will still flow back under the action of gravity, which will affect the working efficiency of the drill bit. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is a schematic diagram of the cutting tooth structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the mounting hole structure of the utility model;

[0018] Figure 3 This is a schematic diagram of the bolt structure of the utility model;

[0019] Figure 4 This is a schematic diagram of the rotating shaft structure of the utility model;

[0020] Figure 5 This is a schematic diagram of the thin ring structure of the utility model;

[0021] Figure 6 This is a schematic diagram of the limit block structure of the utility model.

[0022] In the figure: 1. drill body; 101. main rod; 102. push rod; 103. cutting teeth; 104. mounting hole; 2. anti-backflow mechanism; 201. outer ring; 202. bolt; 203. meshing plate 1; 204. rotating plate; 205. connecting plate; 206. meshing plate 2; 207. mounting plate; 208. rotating shaft; 209. outer casing; 210. connecting ring; 211. thin ring; 212. spring; 213. limit block. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] The following is combined with Figure 1-6 To further explain this application in detail,

[0025] The present application embodiment discloses a reverse circulation drill bit. Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 A reverse circulation drill bit includes a drill bit body 1, the drill bit body 1 includes a main rod 101, the top of the main rod 101 is connected to a mandrel 102, the top of the mandrel 102 is fixedly connected to a cutting tooth 103, the number of the cutting teeth 103 is multiple, and the inner cavity of the mandrel 102 is provided with an anti-backflow mechanism 2;

[0026] The anti-backflow mechanism 2 includes an outer ring 201, the surface of the outer ring 201 is installed on the top of the inner cavity of the top rod 102, the inner cavity of the outer ring 201 is movably connected with a rotating plate 204, the bottom of the inner side of the rotating plate 204 is fixedly connected with a connecting plate 205, the bottom of the connecting plate 205 is respectively fixedly connected with a meshing plate 206 and a meshing plate 1 203, the two sides of the meshing plate 206 are movably connected to the two sides of the meshing plate 1 203, the bottom of the outer side of the meshing plate 1 203 is fixedly connected with an outer shell 209, both sides of the inner cavity of the outer shell 209 are movably connected with thin rings 211, the center of the surface of the thin ring 211 is fixedly connected with a connecting ring 210, and the inner side of the connecting ring 210 is fixedly connected to the bottom of the outer side of the meshing plate 206.

[0027] Reference Figure 3 and Figure 4 The inner cavity of the outer ring 201 is fixedly connected with a rotating shaft 208, and the number of the rotating shafts 208 is multiple. The surface of the rotating shaft 208 is movably connected to the inner cavity of the rotating plate 204. Through the setting of the rotating shaft 208, the rotating plate 204 can smoothly rotate in the inner cavity of the outer ring 201, thereby driving the connecting plate 205 and the meshing plate 206 to rotate.

[0028] Reference Figure 3 and Figure 4 The meshing plate 206 and the meshing plate 1 203 are both arranged in an arc-shaped structure, and the angle is 60 degrees. The meshing plate 206 and the meshing plate 1 203 are staggered, and the meshing plate 206 and the meshing plate 1 203 are generally arranged in a conical structure. Through the arrangement of the meshing plate 206 and the meshing plate 1 203, the mud rock in the inner cavity of the main rod 101 and the top rod 102 will fall to the outside of the meshing plate 1 203 and the meshing plate 206 under the action of gravity, thereby achieving the effect of preventing the backflow of the mud rock in the inner cavity of the main rod 101 and the top rod 102.

[0029] Reference Figure 6 Both sides of the thin ring 211 are fixedly connected to the limiting blocks 213, the surface of the limiting blocks 213 is movably connected to the inner cavity of the shell 209, the diameter of the limiting blocks 213 is larger than the diameter of the thin ring 211, and the limiting blocks 213 are arranged in a circular structure. Through the arrangement of the limiting blocks 213, the effect of limiting the thin ring 211 in the moving state is achieved, and the thin ring 211 is prevented from falling off from the inner cavity of the shell 209 during the movement.

[0030] Reference Figure 6Springs 212 are sleeved on both sides of the surface of the thin ring 211, and the outer side of the spring 212 is fixedly connected to the inner side of the limit block 213, and the inner side of the spring 212 is fixedly connected to the inner cavity of the shell 209. Through the setting of the spring 212, when the thin ring 211 moves, the limit block 213 will move to absorb the energy of the generated force. Further, when the thin ring 211 loses its force, the limit block 213 will return to its original position, thereby achieving the effect of opening and closing the bottom of the integral composite of the meshing plate 1 203 and the meshing plate 2 206.

[0031] Reference Figure 3 and Figure 4 The top of the outer ring 201 is fixedly connected with mounting plates 207 all around, the inner cavity of the mounting plate 207 is installed with bolts 202, and the bottom of the mounting plate 207 is fixedly connected to the top of the top rod 102 by bolts 202. Through the setting of the mounting plate 207 and the bolts 202, the outer ring 201 and the top rod 102 in the working state are installed and fixed, so as to avoid the outer ring 201 from shaking and falling off during the working process.

[0032] Reference Figure 2 , Figure 3 and Figure 4 , mounting holes 104 are opened around the top of the inner cavity of the push rod 102, and the mounting holes 104 are arranged in a circular structure. The bottom of the surface of the bolt 202 is movably connected to the inner cavity of the mounting hole 104. Through the setting of the mounting hole 104, the bolt 202 can be smoothly installed and fixed in the inner cavity of the push rod 102, thereby achieving the effect of installing and fixing the outer ring 201 in the working state.

[0033] Working principle: First, the outer ring 201 is placed in the inner cavity of the mandrel 102 by hand, and the movement of the outer ring 201 drives the mounting plate 207 to move, so that the bottom of the mounting plate 207 is closely fitted with the top of the mandrel 102. When the mounting plate 207 reaches the specified position, the bolt 202 is inserted into the mounting hole 104 of the mounting plate 207 and the inner cavity of the mandrel 102 by hand, and then the mandrel 102 and the outer ring 201 in the working state are installed and fixed. Secondly, the main rod 101, the mandrel 102 and the cutting teeth 103 are used to break the rock, and the mud is transported to the main rod 101 by relying on the mud rock. When the mud rock is transported During the delivery, the meshing plate 206 and the meshing plate 1 203 rotate outwards under the pressure of the mud rock, and the rotation of the meshing plate 1 203 and the meshing plate 206 drives the connecting plate 205 to move, and the movement of the connecting plate 205 drives the rotating plate 204 to rotate around the surface of the rotating shaft 208 of the inner cavity of the outer ring 201, and then the meshing plate 206 and the bottom of the meshing plate 1 203 are rotated outwards to open, and the rotation of the meshing plate 1 203 and the meshing plate 206 drives the connecting ring 210 and the outer shell 209 to move, and drives the thin ring 211 to slide in the inner cavity of the outer shell 209, and the movement of the thin ring 211 The limit block 213 is driven to move, so that the spring 212 is compressed, and at the same time, the thin ring 211 and the meshing plate 206 in the working state are installed and fixed through the connecting ring 210, and the size of the hole formed by the meshing plate 1 203 and the bottom of the meshing plate 206 is further adjusted through the thin ring 211 and the outer shell 209, so that the mud rock can be smoothly transported to the main rod 101 through the top rod 102. Finally, when the mud rock is transported, the limit block 213 will return to its original position under the action of the spring 212, and the thin ring 211 is driven to move by the movement of the limit block 213, so that The thin ring 211 is retracted into the inner cavity of the outer shell 209, thereby reducing the overall diameter between the thin ring 211 and the outer shell 209, and making the bottoms of the meshing plates 1 203 and the meshing plates 2 206 fit tightly together. The rotation of the meshing plates 206 and the meshing plates 1 203 drives the connecting plate 205 to move, and the movement of the connecting plate 205 drives the rotating plate 204 to rotate around the rotating shaft 208, thereby making the remaining mud rock in the inner cavity of the main rod 101 and the top rod 102 fall to the outer side of the cone formed by the meshing plates 1 203 and the meshing plates 2 206, thereby avoiding the phenomenon of mud rock backflow, which will affect the working efficiency of the drill bit.

[0034] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A reverse circulation drill bit, characterized in that: The drill bit body (1) comprises a main rod (101), the top of the main rod (101) is connected to a mandrel (102), the top of the mandrel (102) is fixedly connected to a cutting tooth (103), the number of the cutting teeth (103) is plural, and the inner cavity of the mandrel (102) is provided with a backflow prevention mechanism (2); The anti-backflow mechanism (2) comprises an outer ring (201), the surface of the outer ring (201) is mounted on the top of the inner cavity of the push rod (102), the inner cavity of the outer ring (201) is movably connected to a rotating plate (204), the bottom of the inner side of the rotating plate (204) is fixedly connected to a connecting plate (205), the bottom of the connecting plate (205) is respectively fixedly connected to a meshing plate 2 (206) and a meshing plate 1 (203), the two sides of the meshing plate 2 (206) are movably connected to the two sides of the meshing plate 1 (203), the bottom of the outer side of the meshing plate 1 (203) is fixedly connected to an outer shell (209), both sides of the inner cavity of the outer shell (209) are movably connected to thin rings (211), the center of the surface of the thin ring (211) is fixedly connected to a connecting ring (210), and the inner side of the connecting ring (210) is fixedly connected to the bottom of the outer side of the meshing plate 2 (206).

2. A reverse circulation drill bit according to claim 1, characterized in that: The inner cavity of the outer ring (201) is fixedly connected to a rotating shaft (208), the number of the rotating shafts (208) is multiple, and the surface of the rotating shaft (208) is movably connected to the inner cavity of the rotating plate (204).

3. A reverse circulation drill bit according to claim 1, characterized in that: The meshing plate 2 (206) and the meshing plate 1 (203) are both arranged in an arc-shaped structure, and the angle is 60 degrees. The meshing plate 2 (206) and the meshing plate 1 (203) are staggered, and the meshing plate 2 (206) and the meshing plate 1 (203) are generally arranged in a conical structure.

4. A reverse circulation drill bit according to claim 1, characterized in that: Both sides of the thin ring (211) are fixedly connected to limit blocks (213), the surface of the limit blocks (213) is movably connected to the inner cavity of the outer shell (209), the diameter of the limit blocks (213) is greater than the diameter of the thin ring (211), and is arranged in a circular structure.

5. A reverse circulation drill bit according to claim 1, characterized in that: Springs (212) are sleeved on both sides of the surface of the thin ring (211), the outer side of the spring (212) is fixedly connected to the inner side of the limit block (213), and the inner side of the spring (212) is fixedly connected to the inner cavity of the outer shell (209).

6. A reverse circulation drill bit according to claim 1, characterized in that: The top of the outer ring (201) is fixedly connected with a mounting plate (207) on all four sides, the inner cavity of the mounting plate (207) is installed with bolts (202), and the bottom of the mounting plate (207) is fixedly connected to the top of the top rod (102) through the bolts (202).

7. A reverse circulation drill bit according to claim 6, characterized in that: The top of the inner cavity of the push rod (102) is surrounded by mounting holes (104), the mounting holes (104) are arranged in a circular structure, and the bottom of the surface of the bolt (202) is movably connected to the inner cavity of the mounting hole (104).

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