Drill bit of high-pressure jet grouting machine

Abstract

The utility model discloses a drill bit of a high-pressure jet grouting machine, and relates to a drilling tool for conveying slurry under a high-pressure working condition. Comprising a drill bit body, a threaded mounting hole is formed in the drill bit body, an exhaust structure and a drainage structure are mounted in the threaded mounting hole, the exhaust structure is characterized in that an exhaust hole is formed in a bottom plate, a first cover plate is rotatably mounted on the inner wall of an orifice of the exhaust hole through a first rotating device, and the other end of the first cover plate is lapped on the edge of the exhaust orifice; the drainage structure comprises a drainage opening formed in the bottom plate, second cover plates are rotationally installed on the opposite sides of the inner wall of the drainage opening through second rotating devices correspondingly, and the other ends of the two second cover plates abut against each other. The drill bit has the advantages that the installation frame can be conveniently and rapidly installed on the drill bit body for use through threads of the threaded installation hole, meanwhile, the exhaust structure and the drainage structure on the drill bit are arranged in a one-way opening mode, and the exhaust structure and the drainage structure are lifted outwards in the jetting process so that jetting can be conducted.

Description

Technical Field

[0001] The invention discloses a high-pressure jet-jet drill bit, which relates to a drilling tool used for slurry transportation under high-pressure working conditions, and in particular to a jet-jet drilling rig. Background Art

[0002] A rotary jet drilling rig is a drilling tool used to transport media such as slurry, compressed air and clean water. It can ensure continuous dynamic and static tightness under high-pressure working conditions. High-pressure rotary jet machines are divided into single-jet, double-jet and triple-jet according to different hole formation and usage methods. They are mainly composed of drill pipes, diverters, drill bits, anti-loosening devices, anti-loosening devices, pads and reducers.

[0003] In the prior art, when the high-pressure rotary jet spraying machine is in use, mud and water can easily enter the drill bit of the rotary jet spraying machine. When the drill bit needs to be replaced after being used for a period of time, the pressure of the originally cast hole will decrease to normal pressure due to the cessation of spraying when the drill bit is replaced. However, the pressure in the underground mud spraying area is very high, which will cause mud to flow back and block the mud holes, air holes or water spray holes of the drill bit. Utility Model Content

[0004] The problem to be solved by the utility model is to provide a high-pressure jetting drill bit that prevents external mud from entering the drill bit body from the drainage port in view of the above shortcomings. The technical solution is as follows:

[0005] A high-pressure rotary jet machine drill bit comprises a drill bit body, a threaded mounting hole is provided on the drill bit body, an exhaust structure and a drainage structure are installed in the threaded mounting hole, and the key technology is that a mounting frame is inserted into the threaded mounting hole, a base plate is installed on the mounting frame, exhaust structures are respectively installed at both ends of the base plate, and a drainage structure is arranged in the middle of the base plate; the exhaust structure is an exhaust hole provided on the base plate, a first cover plate is rotatably installed on the inner wall of the exhaust hole through a first rotating device, and the other end of the first cover plate is overlapped on the edge of the exhaust hole; the drainage structure comprises a drainage port provided on the base plate, and second cover plates are rotatably installed on the opposite sides of the inner wall of the drainage port through a second rotating device, and the other ends of the two second cover plates are abutted against each other.

[0006] The first rotating device is to open a rotating hole at one end of the first cover plate, install a rotating shaft on the inner wall of the exhaust hole, the rotating hole is sleeved on the rotating shaft, the first torsion spring is sleeved on the rotating shaft, one end of the first torsion spring is installed on the inner wall of the rotating hole and the other end is installed on the outer surface of the rotating shaft.

[0007] The second rotating device is to open a rotating hole at one end of the second cover plate, install a rotating shaft on the inner wall of the drain outlet, the rotating hole is sleeved on the rotating shaft, and the second torsion spring is sleeved on the rotating shaft. One end of the second torsion spring is installed on the inner wall of the rotating hole, and the other end is installed on the outer surface of the rotating shaft.

[0008] A positioning block is installed on a side corresponding to the drain outlet, a second buffer pad is installed on the positioning block, and the second buffer pad is in contact with the bottom side of the second cover plate.

[0009] A fixing plate is installed on an inner wall of one side of the exhaust hole, a first buffer pad is installed on the fixing plate, and the bottom side of the first cover plate contacts the first buffer pad.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] 1. Through the arrangement of structures such as threaded mounting holes, mounting brackets, first cover plates, first torsion springs, drainage ports, second cover plates and rotating holes, the mounting brackets can be quickly mounted on the drill body for use by utilizing the threads of the threaded mounting holes. At the same time, the exhaust structure and drainage structure on the device are both one-way port arrangements, which are lifted outwards during spraying to thereby spray.

[0012] 2. Through the arrangement of the first torsion spring, the first buffer pad, the second buffer pad, the second torsion spring and other structures, the second cover plate and the first cover plate can be quickly opened when draining water to the outside. After the pressure and water are discharged, the first buffer pad and the second torsion spring can use their own restoring force to drive the first cover plate and the second cover plate to quickly and automatically return to their original positions, and respectively press on the first torsion spring and the second buffer pad to form a seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] Figure 2 It is a cross-sectional structural schematic diagram of the drill body, threaded mounting hole and mounting frame of the utility model;

[0015] Figure 3 This is a schematic diagram of the connection structure of the rotating shaft, the first torsion spring and the first cover plate of the utility model;

[0016] Figure 4 It is a schematic diagram of the connection structure of the second torsion spring, the rotating shaft and the second cover plate of the utility model. DETAILED DESCRIPTION

[0017] 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.

[0018] See also Figure 1A high-pressure jet-jet drill bit comprises a drill bit body 1, a threaded mounting hole 2 is provided on the drill bit body 1, an exhaust structure and a drainage structure are installed in the threaded mounting hole 2, and the characteristics are as follows Figure 2 , Figure 3 As shown, the threaded mounting hole 2 is built into the mounting frame 3, the mounting frame 3 is installed on the bottom plate 31, the exhaust structures are respectively installed at both ends of the bottom plate 31, and the drainage structure is arranged in the middle position of the bottom plate 31; the exhaust structure is to open an exhaust hole 33 on the bottom plate 31, and the inner wall of the hole of the exhaust hole 33 is rotatably installed with a first cover plate 34 by a first rotating device, and the other end of the first cover plate 34 overlaps the edge of the exhaust hole; the drainage structure includes a drainage port 4 opened in the middle position of the bottom plate 31, and the opposite sides of the inner wall of the drainage port 4 are rotatably installed with second cover plates 41 by a second rotating device, and the other ends of the two second cover plates 41 are abutted against each other.

[0019] like Figure 3 As shown, the first rotating device is to open a rotating hole 35 at one end of the first cover plate 34, and install a rotating shaft 36 on the inner wall of the exhaust hole 33. The rotating hole 35 is sleeved on the rotating shaft 36, and the first torsion spring 37 is sleeved on the rotating shaft 36. One end of the first torsion spring 37 is installed on the inner wall of the rotating hole 35, and the other end of the first torsion spring 37 is installed on the outer surface of the rotating shaft 36.

[0020] like Figure 4 As shown, the second rotating device is to open a rotating hole 44 at one end of the second cover plate 41, and install a rotating shaft 45 on the inner wall of the drain outlet 4. The rotating hole 44 is sleeved on the rotating shaft 45, and the second torsion spring 46 is sleeved on the rotating shaft 45. One end of the second torsion spring 46 is installed on the inner wall of the rotating hole 44, and the other end of the second torsion spring 46 is installed on the outer surface of the rotating shaft 45.

[0021] A positioning block 42 is installed on a corresponding side of the drain outlet 4 , and a second buffer pad 43 is installed on the positioning block 42 . The second buffer pad 43 contacts the bottom side of the second cover plate 41 .

[0022] A fixing plate 38 is installed on the inner wall of one side of the exhaust hole 33 , and a first buffer pad 32 is installed on the fixing plate 38 . The bottom side of the first cover plate 34 contacts the first buffer pad 32 .

[0023] When the utility model is in use, when the air pressure in the drill body 1 is too high, the air pressure will drive the first cover plate 34 in the exhaust hole 33 to rotate outward on the rotating shaft 36. At this time, the rotating shaft 36 drives the first torsion spring 37 in the rotating hole 35 to deform, so that the air pressure can be ejected outward from the exhaust hole 33; when the air pressure in the drill body 1 drops, since the pressure on the bottom side is greater than the air pressure in the drill body 1, under the action of the external pressure and the restoring force of the first torsion spring 37, the first cover plate 34 is driven to quickly move to the first buffer pad 32 on the fixed plate 38 to restore to its original position. Since the first buffer pad 32 is wear-resistant rubber, the first cover plate 34 can form a seal with the exhaust hole 33 to prevent water and mud from flowing back into the exhaust hole 33 due to excessive external pressure, thereby blocking the exhaust hole 33. Similarly, when the water pressure in the drill body 1 is too high, it will be discharged outward through the drain port 4, and the discharge will drive the second cover plate 41 to rotate; when the water pressure in the drill body 1 drops, the second cover plate 41 returns to its original position to form a seal with the second buffer pad 43, thereby preventing external mud from entering the drill body 1 from the drain port 4.

[0024] The first cover plate 34 and the second cover plate 41 are both made of hard steel plate, and the first buffer pad 32 and the second buffer pad 43 are both made of wear-resistant rubber. When the water in the drill body 1 needs to be discharged outward, the water pressure drives the second cover plate 41 to rotate outward, and the positioning block 42 drives the second torsion spring 46 to deform; after the water pressure in the drill body 1 is reduced, the second torsion spring 46 can be used to conveniently drive the second cover plate 41 to return to its original position and cover the second buffer pad 43 to form a sealed environment.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-pressure jet-jet drill bit, comprising a drill bit body (1), a threaded mounting hole (2) being provided on the drill bit body (1), an exhaust structure and a drainage structure being installed in the threaded mounting hole (2), wherein: The threaded mounting hole (2) is built into the mounting frame (3), the mounting frame (3) is mounted on the bottom plate (31), the exhaust structures are respectively mounted on both ends of the bottom plate (31), and the drainage structure is arranged in the middle of the bottom plate (31); the exhaust structure is an exhaust hole (33) provided on the bottom plate (31), the inner wall of the hole of the exhaust hole (33) is rotationally mounted with a first cover plate (34) by a first rotating device, and the other end of the first cover plate (34) overlaps the edge of the exhaust hole; the drainage structure comprises a drainage port (4) provided on the bottom plate (31), the opposite sides of the inner wall of the drainage port (4) are rotationally mounted with second cover plates (41) by a second rotating device, and the other ends of the two second cover plates (41) are abutted against each other.

2. According to claim 1, a high pressure jet grouting machine drill bit is characterized in that The first rotating device is a rotating hole (35) formed at one end of the first cover plate (34), a rotating shaft (36) is installed on the inner wall of the exhaust hole (33), the rotating hole (35) is sleeved on the rotating shaft (36), a first torsion spring (37) is sleeved on the rotating shaft (36), one end of the first torsion spring (37) is installed on the inner wall of the rotating hole (35), and the other end is installed on the outer surface of the rotating shaft (36).

3. According to claim 1, a high pressure jet grouting machine drill bit is characterized in that The second rotating device is a rotating hole (44) formed at one end of the second cover plate (41), a rotating shaft (45) is installed on the inner wall of the drain port (4), the rotating hole (44) is sleeved on the rotating shaft (45), a second torsion spring (46) is sleeved on the rotating shaft (45), one end of the second torsion spring (46) is installed on the inner wall of the rotating hole (44), and the other end is installed on the outer surface of the rotating shaft (45).

4. According to the high pressure jet grouting machine drill bit of claim 1, it is characterized in that A positioning block (42) is installed on a corresponding side of the drain outlet (4), a second buffer pad (43) is installed on the positioning block (42), and the second buffer pad (43) is in contact with the bottom side of the second cover plate (41).

5. A high pressure jet grouting machine drill bit according to claim 1, characterized in that A fixing plate (38) is installed on the inner wall of one side of the exhaust hole (33), a first buffer pad (32) is installed on the fixing plate (38), and the bottom side of the first cover plate (34) is in contact with the first buffer pad (32).

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