Down-the-hole drill

Abstract

The down-the-hole drill comprises a vehicle body, a movable support, a driver and a drill rod, the movable support is a cantilever mechanism and is arranged at the front end of the vehicle body, the driver is fixedly arranged at the moving end of the movable support, the output end of the driver is connected with the tail end of the drill rod, the driver is a hydraulic reciprocating driving mechanism, and the drill rod is a reciprocating rod mechanism. And the output end of the driver is coaxial with the drill rod. And the drill rod realizes impact through the two impact structures with different amplitudes and different frequencies. According to the utility model, two reciprocating output mechanisms with different amplitudes and different frequencies are adopted at the same impact output end, so that the down-the-hole drill can stably obtain one-time reinforced impact within a certain period, and the impact waveform is changed. And drilling on complex rock stratum conditions is facilitated, and the problem that drilling of the down-the-hole drill is difficult due to the fact that the rock stratum strength is too large is solved.

Description

Technical Field

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

[0002] A down-the-hole drill is a percussion rotary drill. The essence of using a down-the-hole drill for down-the-hole rock drilling is to make the impactor submerge into the hole during the rock drilling process to reduce the energy loss caused by the impact work transmitted by the drill rod, thereby reducing the impact of the hole depth on the rock drilling efficiency. Its internal structure is different from that of a general rock drill. Its gas distribution and piston reciprocating mechanism are independent, that is, the impactor. Its front end is directly connected to the drill bit, and the rear end is connected to the drill rod. When drilling, the impactor submerges into the hole, and through the gas distribution device (valve), the piston (hammer) in the impactor reciprocates to hit the drill tail, so that the drill bit impacts the rock at the bottom of the hole. The high-speed rotation of the impactor in the hole is achieved by a separate rotary mechanism, that is, by an electric motor or pneumatic rotating device outside the hole, through the drill rod connected to the rear end of the impactor. The rock powder generated during rock drilling is flushed out of the hole by a mixed gas of wind and water. The mixed gas is injected into the impactor through the center of the drill rod by the powder discharge mechanism, and then enters the bottom of the hole through the gas groove on the impactor cylinder.

[0003] Since the down-the-hole drill is an impact reciprocating drill, the waveform of the rock force formed by constant force and constant speed drilling is a uniform sawtooth wave with equal amplitude. However, due to the complexity of the geological structure during actual drilling, the constant force waveform often has limited impact effect and is difficult to cope with rock changes.

[0004] Therefore, a down-the-hole drilling rig is needed to solve the above problems. Utility Model Content

[0005] The utility model aims to solve the problem in the prior art that since the down-the-hole drill is an impact reciprocating drill, the waveform formed by the constant-force and constant-speed drilling on the rock formation is a uniform sawtooth wave with equal amplitude, but due to the complexity of the geological structure during actual drilling, the constant-force waveform often has limited impact effect and is difficult to cope with the problem of rock formation changes. The utility model provides a down-the-hole drill, which solves the problem of the prior art by superimposing two different amplitudes.

[0006] The utility model provides a down-the-hole drill, including a vehicle body, a movable support, a driver and a drill rod, wherein the movable support is a cantilever mechanism, which is arranged at the front end of the vehicle body, the driver is fixedly arranged at the moving end of the movable support, the output end of the driver is connected to the rear end of the drill rod, the driver is a hydraulic reciprocating drive mechanism, the drill rod is a reciprocating rod mechanism, and the output end of the driver is coaxial with the drill rod;

[0007] The driver includes a rotating motor, a shell, a rotating slide shaft, a first slide, a second slide, a first sliding block, a second sliding block, a piston, a hydraulic cylinder and a hydraulic rod. The shell is a hollow cylindrical structure. The rotating motor is arranged at the top opening position of the shell. The axial direction of the rotating motor output shaft is arranged in line with the axial direction of the shell. The rotating motor output shaft is connected to the rotating slide shaft. The rotating slide shaft is provided with two reciprocating slides with different depths and axial lengths. The first sliding block is arranged on the first slide, and the second sliding block is arranged on the second slide. The first slide and the second slide are arranged relatively on the inner surface of the shell. The first sliding block and the first sliding block are arranged on the inner surface of the shell. The two sliding blocks are movably arranged on the two sliding grooves of the rotating sliding groove shaft, the hydraulic cylinder is arranged in the lower half of the shell body, the top end of the hydraulic cylinder is open, the piston is arranged in the hydraulic cylinder, the top end of the piston is provided with two rod-shaped guide rails, the first sliding block and the second sliding block are respectively provided with vertical through holes, the two rod-shaped guide rails of the piston are movably connected with the first sliding block through hole and the second sliding block through hole through the top end opening of the hydraulic cylinder, limiting pins are arranged on the top of the two rod-shaped guide rails of the piston, the lowest points of movement of the first sliding block and the second sliding block both contact the upper surface of the piston, and the hydraulic rod is movably arranged at the lower end of the hydraulic cylinder and is connected with the hydraulic cylinder.

[0008] A down-the-hole drill described in the utility model, as a preferred embodiment, a rotating slide shaft includes an axis body, a first slide groove and a second slide groove, the first slide groove and the second slide groove are both arranged on the axis body, the depth of the first slide groove is greater than the depth of the second slide groove, the first slide groove and the second slide groove are both symmetrical structures on the unfolded side surface of the cylinder, the symmetry axis of the first slide groove and the symmetry axis of the second slide groove do not coincide, the axial length of the first slide groove is greater than the axial length of the second slide groove, the first slide groove is a closed structure that is unfolded along the symmetry axis to form a pair of symmetrical line segments, the second slide groove is a closed structure that is unfolded along the symmetry axis to form a broken line structure composed of several pairs of symmetrical line segments of exactly the same size and shape connected end to end, and the length of the line segment in the first slide groove is an integer multiple of the length of the line segment in the second slide groove.

[0009] In the down-the-hole drill described in the utility model, as a preferred embodiment, the vertical length of the first sliding block is smaller than the vertical length of the second sliding block, and the mass of the first sliding block is greater than the mass of the second sliding block.

[0010] The utility model discloses a down-the-hole drill, as a preferred embodiment, an axial limit block is arranged on the outer periphery of the side surface of the hydraulic rod output end, and a plurality of triangular protrusions of uniform and equal height are arranged on the outer periphery of the end surface of the hydraulic rod output end.

[0011] The utility model describes a down-the-hole drilling rig, as a preferred embodiment, the drill rod includes a drill rod fixing sleeve and an impact drill bit, the fixing sleeve is a cylinder, a limiting groove matched with a hydraulic rod limiting block is arranged in the drill rod fixing sleeve, the axial lower edge of the protruding position of the limiting groove is a slope structure, the top of the impact drill bit is radially and evenly provided with axial ribs, the top of the rib is provided with a slope matched with the slope of the axial lower edge of the protruding rib of the limiting groove, a limiting ring is arranged at the bottom port of the fixing sleeve, the inner ring diameter of the limiting ring is smaller than the rib diameter and larger than the impact drill bit rod diameter, and a spring is arranged between the limiting ring and the rib.

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

[0013] This device uses two reciprocating output mechanisms with different amplitudes and frequencies at the same impact output end, so that the working end of the down-the-hole drill will receive a stable enhanced impact within a certain period, causing the impact waveform to change. This is conducive to drilling in complex rock formations and avoiding the problem of difficulty in down-the-hole drilling caused by excessive rock formation strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of a down-the-hole drilling rig;

[0015] Figure 2 A schematic diagram of a down-the-hole drill driver;

[0016] Figure 3 A schematic diagram of a rotary chute shaft of a down-the-hole drilling rig;

[0017] Figure 4 A schematic diagram of a drill rod for a down-the-hole drilling rig.

[0018] Reference numerals:

[0019] 1. Car body; 2. Movable bracket; 3. Driver; 31. Rotating motor; 32. Housing; 33. Rotating slide shaft; 331. Shaft body; 332. First slide; 333. Second slide; 34. First slide; 35. Second slide; 36. First sliding block; 37. Second sliding block; 38. Piston; 39. Hydraulic cylinder; 30. Hydraulic rod; 4. Drill rod; 41. Drill rod fixing sleeve; 42. Impact drill bit. DETAILED DESCRIPTION

[0020] 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.

[0021] Example 1

[0022] like Figure 1As shown, a down-the-hole drilling rig includes a vehicle body 1, a movable support 2, a driver 3 and a drill rod 4. The movable support 2 is a cantilever mechanism, which is arranged at the front end of the vehicle body 1. The driver 3 is fixedly arranged at the moving end of the movable support 2. The output end of the driver 3 is connected to the rear end of the drill rod 4. The driver 3 is a hydraulic reciprocating drive mechanism, and the drill rod 4 is a reciprocating rod mechanism. The output end of the driver 3 is coaxial with the drill rod 4.

[0023] like Figure 2 As shown, the driver 3 includes a rotary motor 31, a housing 32, a rotary slot shaft 33, a first slideway 34, a second slideway 35, a first sliding block 36, a second sliding block 37, a piston 38, a hydraulic cylinder 39 and a hydraulic rod 30. The housing 32 is a hollow cylindrical structure. The rotary motor 31 is arranged at the top opening position of the housing 32. The axial direction of the output shaft of the rotary motor 31 is colinear with the axial direction of the housing 32. The output shaft of the rotary motor 31 is connected to the rotary slot shaft 33. The rotary slot shaft 33 is provided with two reciprocating slots with different depths and axial lengths. The first sliding block 36 is arranged on the first slideway 34, and the second sliding block 37 is arranged on the second slideway 35. The first slideway 34 and the second slideway 35 are arranged relatively on the inner surface of the housing 32. The sliding block 36 and the second sliding block 37 are movably arranged on the two slide grooves of the rotating slide groove shaft 33 respectively, the hydraulic cylinder 39 is arranged in the lower half of the housing 32, the top end of the hydraulic cylinder 39 is open, the piston 38 is arranged in the hydraulic cylinder 39, and the top end of the piston 38 is provided with two rod-shaped guide rails, the first sliding block 36 and the second sliding block 37 are respectively provided with vertical through holes, the two rod-shaped guide rails of the piston 38 are movably connected with the through holes of the first sliding block 36 and the second sliding block 37 through the top opening of the hydraulic cylinder 39, and limit pins are arranged on the top of the two rod-shaped guide rails of the piston 38. The lowest points of movement of the first sliding block 36 and the second sliding block 37 both contact the upper surface of the piston 38, and the hydraulic rod 30 is movably arranged at the lower end of the hydraulic cylinder 39 and is connected to the hydraulic cylinder 39.

[0024] like Figure 3 As shown, the rotating slide groove shaft 33 includes an axis body 331, a first slide groove 332 and a second slide groove 333. The first slide groove 332 and the second slide groove 333 are both arranged on the axis body 331. The depth of the first slide groove 332 is greater than the depth of the second slide groove 333. The first slide groove 332 and the second slide groove 333 are both symmetrical structures on the unfolded side surface of the cylinder. The symmetry axis of the first slide groove 332 and the symmetry axis of the second slide groove 333 do not overlap. The axial length of the first slide groove 332 is greater than the axial length of the second slide groove 333. The first slide groove 332 is a closed structure that is unfolded along the symmetry axis into a pair of symmetrical line segments. The second slide groove 333 is a closed structure that is unfolded along the symmetry axis into a plurality of pairs of symmetrical line segments of exactly the same size and shape connected end to end to form a broken line structure. The length of the line segment in the first slide groove 332 is an integer multiple of the length of the line segment in the second slide groove 333.

[0025] The vertical length of the first sliding block 36 is smaller than the vertical length of the second sliding block 37 , and the mass of the first sliding block 36 is greater than the mass of the second sliding block 37 .

[0026] An axial limit block is arranged on the outer periphery of the side surface of the output end of the hydraulic rod 30, and a plurality of triangular protrusions of uniform height are arranged on the outer periphery of the end surface of the output end of the hydraulic rod 30.

[0027] like Figure 4 As shown, the drill rod 4 includes a drill rod fixing sleeve 41 and an impact drill bit 42. The fixing sleeve is a cylinder. A limiting groove matching with the limiting block of the hydraulic rod 30 is arranged in the drill rod fixing sleeve 41. The axial lower edge of the protruding position of the limiting groove is a slope structure. Axial ribs are evenly arranged radially on the top of the impact drill bit 42. The top of the rib is provided with a slope matching with the axial lower edge slope of the protruding axial edge of the limiting groove. A limiting ring is arranged at the bottom port of the drill rod fixing sleeve 41. The inner ring diameter of the limiting ring is smaller than the rib diameter and larger than the rod diameter of the impact drill bit 42. A spring is arranged between the limiting ring and the rib.

[0028] 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 down-the-hole drill, characterized in that: The invention comprises a vehicle body (1), a movable support (2), a driver (3) and a drill rod (4), wherein the movable support (2) is a cantilever mechanism and is arranged at the front end of the vehicle body (1), the driver (3) is fixedly arranged at the moving end of the movable support (2), the output end of the driver (3) is connected to the rear end of the drill rod (4), the driver (3) is a hydraulic reciprocating drive mechanism, the drill rod (4) is a reciprocating rod mechanism, and the output end of the driver (3) is coaxial with the drill rod (4); The driver (3) comprises a rotating motor (31), a housing (32), a rotating chute shaft (33), a first slideway (34), a second slideway (35), a first sliding block (36), a second sliding block (37), a piston (38), a hydraulic cylinder (39) and a hydraulic rod (30). The housing (32) is a hollow cylindrical structure. The rotating motor (31) is arranged at the top opening position of the housing (32). The output shaft of the rotating motor (31) is axially colinear with the axial direction of the housing (32). The output shaft of the rotating motor (31) is connected to the rotating chute shaft (33). The rotating chute shaft (33) is provided with two reciprocating slideways of different depths and axial lengths. The first sliding block (36) is arranged on the first slideway (34). The second sliding block (37) is arranged on the second slideway (35). The first slideway (34) and the second slideway (35) are arranged relative to each other on the inner surface of the housing (32). The first sliding block The first sliding block (36) and the second sliding block (37) are respectively movably arranged on the two sliding grooves of the rotating sliding groove shaft (33); the hydraulic cylinder (39) is arranged at the lower half of the housing (32); the top end of the hydraulic cylinder (39) is open; the piston (38) is arranged in the hydraulic cylinder (39); the top end of the piston (38) is provided with two rod-shaped guide rails; the first sliding block (36) and the second sliding block (37) are respectively provided with vertical through holes; the two rod-shaped guide rails of the piston (38) are respectively movably connected with the through hole of the first sliding block (36) and the through hole of the second sliding block (37) through the top end opening of the hydraulic cylinder (39); limiting pins are arranged on the top of the two rod-shaped guide rails of the piston (38); the lowest points of movement of the first sliding block (36) and the second sliding block (37) both contact the upper surface of the piston (38); the hydraulic rod (30) is movably arranged at the lower end of the hydraulic cylinder (39) and communicated with the hydraulic cylinder (39).

2. A down-the-hole drill according to claim 1, characterized in that: The rotating slide groove shaft (33) comprises an axis body (331), a first slide groove (332) and a second slide groove (333), wherein the first slide groove (332) and the second slide groove (333) are both arranged on the axis body (331), the depth of the first slide groove (332) is greater than the depth of the second slide groove (333), the first slide groove (332) and the second slide groove (333) are both symmetrical structures on the unfolded side surface of the cylinder, and the symmetry axis of the first slide groove (332) and the second slide groove (333) are symmetrical. The symmetry axes of the two slide grooves (333) do not overlap, the axial length of the first slide groove (332) is greater than the axial length of the second slide groove (333), the first slide groove (332) is a closed structure that unfolds along the symmetry axis to form a pair of symmetrical line segments, and the second slide groove (333) is a closed structure that unfolds along the symmetry axis to form a broken line structure composed of several pairs of symmetrical line segments of exactly the same size and shape connected end to end, and the length of the line segment in the first slide groove (332) is an integral multiple of the length of the line segment in the second slide groove (333).

3. A down-the-hole drill according to claim 2, characterized in that: The vertical length of the first sliding block (36) is smaller than the vertical length of the second sliding block (37), and the mass of the first sliding block (36) is greater than the mass of the second sliding block (37).

4. A down-the-hole drill according to claim 1, characterized in that: An axial limit block is provided on the outer periphery of the side surface of the output end of the hydraulic rod (30), and a plurality of triangular protrusions of uniform height are provided on the outer periphery of the end surface of the output end of the hydraulic rod (30).

5. A down-the-hole drill according to claim 4, characterized in that: The drill rod (4) comprises a drill rod fixing sleeve (41) and an impact drill bit (42); the fixing sleeve is a cylinder; a limit groove matching with the limit block of the hydraulic rod (30) is arranged inside the drill rod fixing sleeve (41); the axial lower edge of the protruding position of the limit groove is a slope structure; axial ribs are evenly arranged at the top of the impact drill bit (42) in the radial direction; the top of the rib is provided with a slope matching with the axial lower edge slope of the protruding axial limit groove; a limit ring is arranged at the bottom end of the drill rod fixing sleeve (41); the inner ring diameter of the limit ring is smaller than the diameter of the rib and larger than the rod diameter of the impact drill bit (42); a spring is arranged between the limit ring and the rib.

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