Reinforced down-the-hole drill buffer

Abstract

The utility model relates to a reinforced down-the-hole drill buffer which comprises a sleeve, an end cover, a lower connector and a piston rod, the two ends of the sleeve are fixedly connected with the end cover and the lower connector respectively, the piston rod is connected between the sleeve and the end cover in a sliding mode, a vent pipe is arranged at the end, facing the piston rod, of the lower connector, and the piston rod is provided with a center hole communicated with the vent pipe. A spring piece is further included, the vent pipe is sleeved with the spring piece, and the spring piece is arranged between the lower connector and the piston rod. The utility model mainly aims to increase the impact resistance of the buffer by adding the spring piece on the basis of the original piston structure, when the impact hammer works and impacts, the piston rod moves towards the direction of the lower joint, and the spring piece is stressed and deformed while the piston rod is buffered by high-pressure gas, so that the shock resistance of the buffer is improved. Therefore, the shock resistance of the buffer is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling rigs, in particular to a reinforced down-the-hole drilling rig buffer. Background Art

[0002] The buffer of a down-the-hole drill is a necessary protective structure for buffering the vibration generated by an impact hammer and protecting the drill pipe. For example, patent No. 201220481446.7 discloses a down-the-hole drill buffer, which includes a casing, a piston rod and a piston. The upper end of the casing is connected to the end cover, and the lower end of the casing is connected to the lower joint of the drill pipe. The casing mainly plays the role of piston buffer by delivering high-pressure gas. However, with the advancement of construction engineering technology, the holes need to be drilled deeper and deeper, and the propulsion force required by down-the-hole drills is getting greater and greater, while the gas pressure delivered by this type of buffer is limited, resulting in insufficient gas pressure at the bottom of the piston rod when it is actually used in large down-the-hole drills, making it easy for the piston rod to directly hit the casing, affecting the service life of the buffer. Utility Model Content

[0003] In order to overcome the shortcomings of the background technology, the technical solution adopted by the utility model is: a reinforced down-the-hole drilling rig buffer, including a casing, an end cover, a lower joint and a piston rod, the two ends of the casing are respectively fixedly connected with the end cover and the lower joint, and the piston rod is slidably connected between the casing and the end cover, an air vent is provided at one end of the lower joint facing the piston rod, the piston rod is provided with a center hole connected to the air vent, and also includes a spring sheet, the air vent sleeve is provided with a spring sheet, and the spring sheet is provided between the lower joint and the piston rod.

[0004] By adopting the above technical solution, the piston rod and the lower joint are respectively connected to the power head and impact hammer of the drilling rig, and the high-pressure gas is transported to the impact hammer through the center hole and the air vent, and a spring sheet is installed between the lower joint and the piston rod. On the basis of the original pneumatic buffer structure, the spring sheet is added to enhance the impact resistance of the buffer, and the spring sheets with different stiffness coefficients are replaced according to different tonnages. It is suitable for large down-the-hole drilling rigs.

[0005] The utility model is further configured such that the piston rod is respectively provided with an external connection portion, a cylindrical portion, a piston portion and an external hexagonal portion from top to bottom, the end cover is slidably connected with the cylindrical portion, the sleeve is provided with an inner cavity and an internal hexagonal groove respectively matched with the piston portion and the external hexagonal portion, and the two ends of the spring sheet are respectively abutted against the external hexagonal portion and the lower joint.

[0006] Furthermore, the end cover is provided with a first sealing ring, the cylindrical part is sealed and connected to the end cover via the first sealing ring, and the piston part is provided with a second sealing ring, and the piston part is sealed and connected to the inner cavity via the second sealing ring.

[0007] Furthermore, the piston rod is provided with a slide groove coaxially distributed with the air vent tube, and the air vent tube is slidably connected to the slide groove.

[0008] By adopting the above technical solution, the cross-sections of the external connecting part and the external hexagonal part of the piston rod are both regular hexagons, which transmit torque while the drill rod is advancing. There are three groups of first sealing rings axially distributed on the end cover, and four groups of second sealing rings axially distributed on the piston part. The first sealing rings and the second sealing rings are used to improve the air tightness of the piston structure.

[0009] The utility model is further configured such that the end cover and the lower joint are both provided with a mounting portion having the same outer diameter as the sleeve, the mounting portion is provided with connecting holes distributed in a circumference, both ends of the sleeve are provided with threaded holes corresponding to the connecting holes, and the end cover and the lower joint are threadedly connected to the two ends of the sleeve through the threaded holes.

[0010] By adopting the above technical solution, the end cover and the lower joint are connected to the two ends of the sleeve by screw threads. Since the mounting portion has the same outer diameter as the sleeve, the overall appearance of the buffer is unified and the internal structure is compact.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] On the basis of the original piston structure, the buffer adds a spring sheet to improve the buffer's impact resistance. When the impact hammer is working and generates an impact, the piston rod moves toward the lower joint. While the piston rod is buffered by the high-pressure gas, the spring sheet is stressed and deformed, thereby improving the buffer's impact resistance and increasing the buffer's service life.

[0013] The embodiments of the utility model are further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a half-section view of the utility model;

[0015] Figure 2 For the utility model Figure 1 A partial enlarged view of the A-direction view;

[0016] Figure 3 For the utility model Figure 1 A partial enlarged view of the B direction view;

[0017] Among them: 1-sleeve, 2-end cover, 3-lower joint, 4-piston rod, 5-air vent, 6-center hole, 7-spring sheet, 8-first sealing ring, 9-second sealing ring, 10-slideway, 11-external connection part, 12-cylindrical part, 13-piston part, 14-external hexagonal part, 15-inner cavity, 16-inner hexagonal groove, 17-installation part, 18-connection hole, 19-threaded hole; DETAILED DESCRIPTION

[0018] like Figure 1 As shown, the present embodiment provides a reinforced down-the-hole drill buffer, comprising a casing 1, an end cover 2, a lower joint 3 and a piston rod 4, the two ends of the casing 1 are respectively fixedly connected with the end cover 2 and the lower joint 3, and the piston rod 4 is slidably connected between the casing 1 and the end cover 2, a vent pipe 5 is provided at one end of the lower joint 3 facing the piston rod 4, the piston rod 4 is provided with a center hole 6 connected to the vent pipe 5, and also includes a spring sheet 7, the vent pipe 5 is sleeved with the spring sheet 7, and the spring sheet 7 is provided between the lower joint 3 and the piston rod 4.

[0019] Combination Figure 2 , 3 As shown, in this embodiment, the piston rod 4 is respectively provided with an external connection portion 11, a cylindrical portion 12, a piston portion 13 and an outer hexagonal portion 14 from top to bottom, the end cover 2 is slidably connected with the cylindrical portion 12, the sleeve 1 is provided with an inner cavity 15 and an inner hexagonal groove 16 respectively adapted to the piston portion 13 and the outer hexagonal portion 14, the two ends of the spring sheet 7 are respectively abutted against the outer hexagonal portion 14 and the lower joint 3, the end cover 2 is provided with a first sealing ring 8, the cylindrical portion 12 is sealed and connected to the end cover 2 through the first sealing ring 8, and the piston portion 13 is provided with a second sealing ring 8. Sealing ring 9, the piston part 13 is sealed and connected to the inner cavity 15 through the second sealing ring 9, the piston rod 4 is provided with a slide groove 10 coaxially distributed with the air vent tube 5, the air vent tube 5 is slidably connected to the slide groove 10, the cross-sections of the external connection part 11 and the external hexagonal part 14 of the piston rod 4 are both regular hexagons, and the torque is transmitted while the drill rod is advanced, the end cover 2 is axially distributed with three groups of first sealing rings 8, and the piston part 13 is axially distributed with four groups of second sealing rings 9, and the air tightness of the piston structure is improved by the first sealing ring 8 and the second sealing ring 9.

[0020] In this embodiment, the end cover 2 and the lower joint 3 are both provided with a mounting portion 17 having the same outer diameter as the sleeve 1, the mounting portion 17 is provided with connecting holes 18 distributed in a circumference, and threaded holes 19 corresponding to the connecting holes 18 are provided at both ends of the sleeve 1, and the end cover 2 and the lower joint 3 are threadedly connected to the two ends of the sleeve 1 through the threaded holes 19, and the end cover 2 and the lower joint 3 are threadedly connected to the two ends of the sleeve 1 through screws. Since the mounting portion 17 has the same outer diameter as the sleeve 1, the overall appearance of the buffer is unified and the internal structure is compact.

[0021] The working principle of the utility model is that the piston rod 4 and the lower joint 3 are respectively connected to the power head and the impact hammer of the drilling rig, the torque of the power head is transmitted to the impact hammer by the buffer, and the high-pressure gas is delivered to the impact hammer through the center hole 6 and the air vent 5. When the impact hammer works and generates an impact, the piston rod 4 moves toward the lower joint 3. While the piston part 13 is buffered by the high-pressure gas, the spring sheet 7 is deformed by the force, thereby improving the impact resistance of the buffer.

[0022] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A reinforced down-the-hole drill buffer, comprising a casing (1), an end cover (2), a lower joint (3) and a piston rod (4), wherein the two ends of the casing (1) are respectively fixedly connected with the end cover (2) and the lower joint (3), and the piston rod (4) is slidably connected between the casing (1) and the end cover (2), and a vent pipe (5) is provided at one end of the lower joint (3) facing the piston rod (4), and the piston rod (4) is provided with a center hole (6) connected with the vent pipe (5), characterized in that: It also includes a spring sheet (7), the air vent tube (5) is sleeved with the spring sheet (7), and the spring sheet (7) is arranged between the lower joint (3) and the piston rod (4).

2. A reinforced down-the-hole drill buffer according to claim 1, characterized in that: The piston rod (4) is provided with an external connection portion (11), a cylindrical portion (12), a piston portion (13) and an external hexagonal portion (14) from top to bottom, respectively; the end cover (2) is slidably connected with the cylindrical portion (12); the sleeve (1) is provided with an inner cavity (15) and an inner hexagonal groove (16) respectively matched with the piston portion (13) and the external hexagonal portion (14); and the two ends of the spring sheet (7) are respectively in contact with the external hexagonal portion (14) and the lower joint (3).

3. A reinforced down-the-hole drill buffer according to claim 2, characterized in that: The end cover (2) is provided with a first sealing ring (8), the cylindrical portion (12) is sealedly connected to the end cover (2) via the first sealing ring (8), the piston portion (13) is provided with a second sealing ring (9), and the piston portion (13) is sealedly connected to the inner cavity (15) via the second sealing ring (9).

4. A reinforced down-the-hole drill buffer according to claim 3, characterized in that: The piston rod (4) is provided with a slide groove (10) coaxially distributed with the air vent tube (5), and the air vent tube (5) is slidably connected to the slide groove (10).

5. The reinforced down-the-hole drill buffer according to claim 1, characterized in that: The end cover (2) and the lower joint (3) are both provided with a mounting portion (17) having the same outer diameter as the sleeve (1); the mounting portion (17) is provided with connecting holes (18) distributed in a circumferential manner; both ends of the sleeve (1) are provided with threaded holes (19) corresponding to the connecting holes (18); and the end cover (2) and the lower joint (3) are threadedly connected to both ends of the sleeve (1) via the threaded holes (19).

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