Drill rod assembly of down-the-hole drill

Abstract

The utility model relates to the technical field of down-the-hole drills, in particular to a drill rod assembly of a down-the-hole drill, which comprises a drill main body, a transmission shaft is arranged at the output end of the drill main body, a connector is arranged at the front end of the transmission shaft, the transmission shaft is connected with the drill main body through the connector, and the connector is of a barrel structure. An axial sliding column and two radial sliding columns are arranged in the connector, the inner end face of the axial sliding column is connected with an embedded crown through a connecting column, the embedded crown is in sliding fit with the inner ends of the two radial sliding columns, the outer ends of the radial sliding columns are provided with matched convex keys respectively, and the matched convex keys are connected with the embedded crown through a connecting column. The tail end face of the drill rod body makes contact with the outer end of the axial sliding column and pushes the axial sliding column to slide inwards, the connector is used in cooperation with the fastening sleeve, it can be guaranteed that the drill rod assembly is rapidly assembled, disassembled and changed, axial or circumferential movement between the coupler and the output shaft can be effectively avoided when the drill rod assembly works, and normal use of equipment is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of down-the-hole drilling machines, in particular to a drill rod assembly of a down-the-hole drilling machine. Background Art

[0002] A down-the-hole drill is a mining machine used for drilling holes in underground rock formations. It is mainly used in underground mines, tunnels, water conservancy and other geotechnical projects. The coupling can be integrated with the drill rod, that is, one end of the coupling is connected to the rear end of the drill rod in an integrated manner, and the other end of the coupling is connected to the shaft hole opened at the output end of the output shaft and fixed by a flat key to ensure that the output shaft transmits torque to the drill rod through the coupling.

[0003] In the actual drilling process, the tight transition fit between the flat key and the corresponding keyway will loosen over time, resulting in axial or circumferential movement between the coupling and the output shaft under severe vibration working conditions, thereby affecting the normal operation of the construction equipment. Therefore, in order to ensure that the down-the-hole drill can be used normally, a drill rod assembly for the down-the-hole drill is proposed. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes a drill rod assembly for a down-the-hole drill.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The cam is provided with a plurality of radially movable members, and the movable members are connected to the cam by the movable member, and the movable member is connected to the cam by the movable member.

[0007] In a preferred technical solution, the axial sliding column, the connecting column, the embedded crown and the raised ring are of an integrally formed design.

[0008] In a preferred technical solution, the groove extension profile of the avoidance groove opened at the front end of the radial sliding column is designed to be an arc shape that is compatible with the raised ring.

[0009] In a preferred technical solution, the outer sleeve of the connector is provided with a fastening sleeve, and openings are respectively provided on both sides of the outer surface of the fastening sleeve, and the matching convex keys provided on the outer ends of the two radial sliding columns extend from the inside to the outside and are inserted into the corresponding openings.

[0010] In a preferred technical solution, the front end of the fastening sleeve covers the rear end of the drill rod body.

[0011] In a preferred technical solution, a sealing ring is provided along the edge of the front end face of the connector, the sealing ring is an internal thread and is threadedly connected to the rear end of the drill rod body.

[0012] The beneficial effects of the utility model are:

[0013] The drill rod assembly proposed in this solution solves the problem that the drill rod of the down-the-hole drill may move and affect the normal use of the equipment. The use of the connector in conjunction with the fastening sleeve can, on the one hand, ensure the rapid assembly and disassembly of the drill rod assembly, and on the other hand, effectively avoid axial or circumferential movement between the coupling and the output shaft when the drill rod assembly is working, thereby ensuring the normal use of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall structure of the down-the-hole drill proposed by the utility model;

[0015] Figure 2 This is a structural schematic diagram of the assembly perspective of various components of the down-the-hole drill proposed by the utility model;

[0016] Figure 3 This is a schematic diagram of the structure of the connector proposed by the utility model;

[0017] Figure 4 This is a schematic structural diagram of the connector proposed by the utility model in a half-section state.

[0018] In the figure: 1. Drilling rig body; 2. Transmission shaft; 3. Connector; 4. Drill rod body; 5. Fastening sleeve; 6. Sealing ring; 7. Axial sliding column; 8. Connecting column; 9. Embedded crown; 91. Raised ring; 92. Accommodating groove; 10. Radial sliding column; 101. Avoidance groove; 11. Matching convex key. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0020] In this embodiment, refer to Figure 1-4A drill rod assembly of a down-the-hole drill comprises a drill body 1, a transmission shaft 2 is arranged at the output end of the drill body 1, a connector 3 is arranged at the front end of the transmission shaft 2, and the transmission shaft 2 is connected to the drill rod body 4 through the connector 3.

[0021] The connector 3 is a cylindrical structure. Figure 3 And attached Figure 4 As shown, the connector 3 is provided with an axial sliding column 7 and two radial sliding columns 10, and the contacting part between the inner end of the axial sliding column 7 and the inner end of the two radial sliding columns 10 is designed as a sliding matching inclined surface. When the axial sliding column 7 slides inward, the two radial sliding columns 10 are pushed outward by the push between the inclined surfaces.

[0022] Here, the outer ends of the radial sliding columns 10 are respectively provided with matching convex keys 11, and the rear end surface of the drill rod body 4 touches the outer end of the axial sliding column 7 and pushes the axial sliding column 7 to slide inward.

[0023] When the two radial sliding columns 10 are pushed outward, the matching convex key 11 will also extend outward synchronously. The outer sleeve of the connector 3 is provided with a fastening sleeve 5, and through openings are respectively provided on both sides of the outer surface of the fastening sleeve 5. The matching convex keys 11 provided on the outer ends of the two radial sliding columns 10 extend from the inside to the outside and are inserted into the corresponding through openings, and finally form a stable plug-in relationship. The use of the matching convex key 11 is equivalent to locking the fastening sleeve 5 to ensure that its position is fixed. When the position of the fastening sleeve 5 is determined, the front end of the fastening sleeve 5 just covers the tail of the drill rod body 4, and the inner wall of the fastening sleeve 5 is equivalent to clamping the drill rod body 4 and the connector 3 at the same time, so that the axial or circumferential movement between the coupling and the output shaft when the equipment is working can be effectively avoided, thereby ensuring the normal use of the equipment.

[0024] As attached Figure 4 As shown, the inner end surface of the axial sliding column 7 is connected to the embedded crown 9 through the connecting column 8, and the embedded crown 9 is provided with a raised ring 91 along its inner edge. The axial sliding column 7, the connecting column 8, the embedded crown 9 and the raised ring 91 are of an integrally formed design.

[0025] The annular cavity formed between the raised ring 91 and the connecting column 8 is designed as a receiving groove 92, and the inner ends of the two radial sliding columns 10 are respectively provided with U-shaped avoidance grooves 101, and the embedded crown 9 and the inner ends of the two radial sliding columns 10 form a sliding adaptation relationship. It should be particularly noted that the groove extension profile of the avoidance groove 101 opened at the front end of the radial sliding column 10 is designed to be an arc shape adapted to the raised ring 91.

[0026] The size of the slot opening of the accommodating slot 92 is adapted to the size of the protruding portion formed by the avoidance slot 101 at the front end of the two radial sliding columns 10, that is, the protruding portions at the front end of the two radial sliding columns 10 can just be respectively built into the accommodating slot 92. The purpose of such design is to ensure that the sliding directions of the axial sliding column 7 and the radial sliding column 10 are both reversible in both directions, that is, the axial sliding column 7 can be used to move forward and backward to control the extension and extension of the two radial sliding columns 10.

[0027] A sealing ring 6 is provided along the edge of the front end face of the connector 3, and the sealing ring 6 is an internal thread and is threadedly connected to the rear end of the drill rod body 4. The thread design is used to assemble the drill rod body 4 and the connector 3, thereby forming an integral structure.

[0028] In the actual installation process, the fastening sleeve 5 is first put on the connector 3, and then the drill rod body 4 is installed. As the drill rod body 4 is screwed into the sealing ring 6, the inner end surface of the drill rod body 4 will gradually push the axial sliding column 7 inward, so the two radial sliding columns 10 are synchronously extended outward and the matching convex key 11 is inserted into the through hole of the fastening sleeve 5, and finally the drill rod body 4, the connector 3, the fastening sleeve 5 and the transmission shaft 2 form a whole, which is convenient for use. When disassembling, the drill rod body 4 is screwed out, and then the two matching convex keys 11 are pressed at the same time to achieve the fastening sleeve 5 and The connector 3 is quickly separated.

[0029] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A drill rod assembly for a down-the-hole drill, comprising a drill body (1), wherein a transmission shaft (2) is provided at an output end of the drill body (1), wherein: The front end of the transmission shaft (2) is provided with a connector (3), and the transmission shaft (2) is connected to the drill rod body (4) through the connector (3). The connector (3) is a cylindrical structure, and an axial sliding column (7) and two radial sliding columns (10) are provided inside the connector (3). The contacting parts of the inner end of the axial sliding column (7) and the inner ends of the two radial sliding columns (10) are designed as sliding-matching inclined surfaces. The inner end surface of the axial sliding column (7) is connected to an embedded crown (9) through a connecting column (8), and the embedded crown (9) is connected along the inner end surface of the axial sliding column (7). A raised ring (91) is provided on its inner edge, and the annular cavity formed between the raised ring (91) and the connecting column (8) is designed as a receiving groove (92). The inner ends of the two radial sliding columns (10) are respectively provided with U-shaped avoidance grooves (101). The embedded crown (9) and the inner ends of the two radial sliding columns (10) form a sliding adaptation relationship. The outer ends of the radial sliding columns (10) are respectively provided with matching convex keys (11). The rear end surface of the drill rod body (4) touches the outer end of the axial sliding column (7) and pushes the axial sliding column (7) to slide inward.

2. A drill rod assembly for a down-the-hole drill according to claim 1, characterized in that: The axial sliding column (7), the connecting column (8), the embedded crown (9) and the raised ring (91) are of an integrated molding design.

3. The drill rod assembly of a down-the-hole drill according to claim 2, characterized in that: The groove extension profile of the avoidance groove (101) provided at the front end of the radial sliding column (10) is designed to be an arc shape that matches the raised ring (91).

4. The drill rod assembly of a down-the-hole drill according to claim 1, characterized in that: The outer sleeve of the connector (3) is provided with a fastening sleeve (5), and openings are respectively provided on both sides of the outer surface of the fastening sleeve (5), and matching convex keys (11) arranged at the outer ends of two radial sliding columns (10) respectively extend from the inside to the outside and are inserted into the corresponding openings.

5. The drill rod assembly of a down-the-hole drill according to claim 4, characterized in that: The front end of the fastening sleeve (5) covers the rear end of the drill rod body (4).

6. The drill rod assembly of a down-the-hole drill according to claim 1, characterized in that: A sealing ring (6) is provided along the edge of the front end surface of the connector (3); the sealing ring (6) is an internal thread and is threadedly connected to the rear end of the drill rod body (4).

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