Immersed Tube Rope DTH Hammer

Abstract

The invention discloses a pipe-immersed rope down-the-hole hammer, aiming at providing a down-the-hole hammer with good crushing effect, high efficiency and pile hole depth not limited by drill rod length. The down-the-hole hammer comprises a suspension unit located in the pipe-immersed hammer, a slewing unit and a down-the-hole hammer, wherein the suspension unit comprises a base (1) having two T-shaped inclined surface slide grooves (1-2), a T-shaped inclined surface slide block (3) installed in each T-shaped inclined surface slide groove (1-2), a pressure block (18) closing each T-shaped inclined surface slide groove (1-2), a spring (17) located between the pressure block (18) and the T-shaped inclined surface slide block (3), and a main suspension ring (2) fixed on each T-shaped inclined surface slide block (3); the slewing unit comprises a housing (4) fixed on the back of the base (1), a hollow shaft (16) installed in the housing, and a motor (5) driving the hollow shaft to rotate; and the down-the-hole hammer is connected to a connecting screw sleeve (7) through a drill rod (10).

Description

Technical Field

[0001] The invention relates to a down-the-hole hammer, in particular to a pipe-immersed rope down-the-hole hammer, belonging to a pile hole drilling tool. Background Art

[0002] The down-the-hole hammer is a tool used to break rocks during the construction of foundation pile holes. It is usually composed of a hammer head that is slidably connected to the impactor through a spline. Its working principle is to use the power device installed on the drilling rig to drive the down-the-hole hammer to rotate and sink through the hollow drill rod to achieve drilling, and use compressed air through the hollow drill rod to push the piston in the impactor to force the hammer head to make up and down reciprocating impact motion, thereby achieving rock breaking. The broken rock cuttings are carried to the ground with the exhaust gas discharged by the down-the-hole hammer, thereby achieving hole cleaning and slag removal.

[0003] At present, a rigid connection component (such as a drill pipe) is usually used to drive the pneumatic down-the-hole hammer to sink and rotate, which has the following defects:

[0004] 1) The drilling depth is limited by the length of the drill rod and cannot meet the requirements of deep hole drilling;

[0005] 2) If the drill rod is too long, it will not only cause large swings, the drill rod is prone to friction with the pile hole wall, but also reduce the transmission efficiency;

[0006] 3) Drilling too deep will not only make slag removal difficult and affect drilling efficiency, but also easily aggravate the rapid wear of the hammer head.

[0007] On January 19, 2021, the applicant submitted a patent application entitled "Spinning Pneumatic Down-the-hole Hammer (CN112647839A)" to the State Intellectual Property Office. The patent application is a rotating device consisting of a support plate, a rotating joint and a spiral pneumatic device that are fixedly connected from top to bottom in sequence, driving the pneumatic down-the-hole hammer to rotate through a drill pipe. Although this technical solution uses steel ropes to replace traditional rigid connecting components (such as hollow drill pipes) to eliminate the above-mentioned many defects of traditional down-the-hole hammers, it also has the following shortcomings:

[0008] 1) Since the support plate cannot be fixed, when the pneumatic rotary device drives the drill bit to rotate, it will generate reverse torque on the support plate. Therefore, the support plate is prone to swing or rotate, causing the steel rope to twist and knot, thereby affecting the rock crushing effect.

[0009] 2) If there is no immersed pipe, the pneumatic rotary device or down-the-hole hammer is prone to rubbing against the pile hole wall, affecting construction efficiency and quality. Summary of the invention

[0010] In view of the above-mentioned defects in the prior art, the present invention aims to provide a pipe-immersed rope down-the-hole hammer with good crushing effect, high construction efficiency, good pile hole quality and pile hole depth not limited by the drill rod length.

[0011] In order to achieve the above purpose, the present invention adopts the following technical solution: it includes a suspension unit, a rotary unit and a down-the-hole hammer located in the immersed tube and fixedly connected in sequence from top to bottom, and the down-the-hole hammer is composed of a hammer head threadedly connected to the impactor. Among them, the suspension unit is composed of a base with two T-shaped inclined plane grooves on the surface that are distributed downward from the inside to the outside, a T-shaped inclined plane slider installed in each T-shaped inclined plane groove, a pressure block fixed on the surface of the base and closing each T-shaped inclined plane groove respectively, a spring located between the pressure block and the corresponding T-shaped inclined plane slider, and a main suspension ring fixed on each T-shaped inclined plane slider respectively. The surface of the base is provided with an air inlet hole and a threading hole, and the circumferential surface of the base is provided with a plurality of crescent-shaped exhaust grooves, and the bottom of the T-shaped inclined plane groove is inclined downward from the inside to the outside; the rotary unit is composed of a shell fixed on the back of the base, a hollow shaft vertically installed in the shell and connected to the air inlet hole, a motor fixed in the shell and driving the hollow shaft to rotate through a reduction mechanism, and a connecting screw sleeve fixed on the lower end of the hollow shaft; the down-the-hole hammer is connected to the connecting screw sleeve through a drill rod.

[0012] On the basis of the above technical solution, the lower end of the drill rod can adopt a "convex" shaped structure, and a slag collector is installed on the drill rod; the slag collector is composed of a slag collecting tube with a funnel-shaped structure, two M-shaped brackets fixed in the slag collecting tube from top to bottom, and two sliding sleeves fixed at the center of each bracket and sleeved on the drill rod.

[0013] On the basis of the above technical solution, two auxiliary lifting rings are fixed on the slag collector.

[0014] Compared with the prior art, the present invention has the following advantages due to the adoption of the above technical solution:

[0015] 1) The slewing unit fixedly connected to the suspension unit is used to replace the hydraulic power unit or motor power unit originally installed on the drilling rig, so that a steel rope can be used to realize a soft connection between the drilling rig and the down-the-hole hammer; the defect that the drilling depth of the traditional down-the-hole hammer is limited by the length of the drill rod is completely overcome, and deep pile hole drilling can be realized;

[0016] 2) The use of immersed pipes can not only support the inner wall of the pile hole to prevent the pile hole wall from collapsing and affecting the construction quality, but also prevent the hollow drill rod, down-the-hole hammer and other moving parts from rubbing against the inner wall of the pile hole and affecting the construction efficiency;

[0017] 3) The suspension unit uses a T-shaped inclined slider that is tightened by a spring. Therefore, the friction between the T-shaped inclined slider and the inner wall of the immersed tube can be used to fix the suspension unit, thereby avoiding twisting and knotting of the steel rope due to swinging or rotation of the suspension unit;

[0018] 4) Since the drill rod length is greatly shortened and the rigidity is improved, the drill rod will not rub against the immersed tube wall due to large swings during rotation, and the transmission efficiency will not be lost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention;

[0020] Figure 2 yes Figure 1 Left view after removing the immersed tube;

[0021] Figure 3 yes Figure 1 Schematic diagram of the suspension unit and the slewing unit structure;

[0022] Figure 4 yes Figure 1 A top view of the

[0023] Figure 5 It is a schematic diagram of the three-dimensional structure of the base of the suspension unit of the present invention;

[0024] Figure 6 It is a schematic diagram of the structure of a T-shaped inclined sliding block of a suspension unit of the present invention;

[0025] Figure 7 yes Figure 6 Right view of;

[0026] Figure 8 yes Figure 6 The B-B section view in FIG.

[0027] Fig. 9 yes Figure 2 A-A section view in.

[0028] In the figure: base 1, exhaust groove 1-1, T-shaped inclined surface slide groove 1-2, main lifting ring 2, T-shaped inclined surface slide block 3, shell 4, motor 5, reduction mechanism 6, connecting screw sleeve 7, auxiliary lifting ring 8, slag collecting barrel 9, drill rod 10, impactor 11, hammer head 12, exhaust hole 13, bracket 14, immersed tube 15, hollow shaft 16, spring 17, pressure block 18, pipe joint 19, sliding sleeve 20. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0030] like Figures 1 to 9 As shown, the present invention includes a suspension unit, a slewing unit and a down-the-hole hammer which are located in a immersed tube 15 and are fixedly connected in sequence from top to bottom. The down-the-hole hammer is composed of a hammer head 12 which is threadedly connected to the impactor 11.

[0031] The suspension unit is composed of a base 1, two T-shaped inclined plane slide grooves 1-2 distributed on the surface of the base and tilted downward from the inside to the outside in an "eight" shape, a T-shaped inclined plane slider 3 installed in each T-shaped inclined plane slide groove 1-2 and adapted thereto, a pressing block 18 fixed on the surface of the base 1 and closing each T-shaped inclined plane slide groove 1-2 respectively, a spring 17 located between the pressing block 18 and the corresponding T-shaped inclined plane slider 3, and a main suspension ring 2 fixed on each T-shaped inclined plane slider 3. The surface of the base 1 is provided with an air inlet hole and a threading hole (not shown in the figure), and the circumferential surface of the base is provided with a plurality of crescent-shaped exhaust grooves 1-1.

[0032] The rotary unit is composed of a shell 4 fixed to the back of the base 1, a hollow shaft 16 vertically installed in the shell through a bearing (not shown in the figure) and connected to the air inlet, a motor 5 fixed in the shell 4 and driving the hollow shaft to rotate through a reduction mechanism 6, and a connecting screw sleeve 7 fixed to the lower end of the hollow shaft 16.

[0033] The upper end of the drill rod 10 is threadedly connected to the connecting screw sleeve 7, and the lower end of the drill rod 10 is threadedly connected to the impactor 11 of the down-the-hole hammer.

[0034] In order to collect the rock slag, a slag collector is installed on the drill rod 10. The slag collector is composed of a slag collecting tube 9 with a funnel-shaped structure, two cross-shaped brackets 14 welded in the slag collecting tube, and two sliding sleeves 20 welded at the center of each bracket 14 and sleeved on the drill rod 10. Correspondingly, the lower end of the drill rod 10 adopts a "convex" shape structure.

[0035] In order to facilitate slag discharge, two auxiliary lifting rings 8 are fixed on the slag collector.

[0036] In order to facilitate connection with an air compressor, a pipe joint 19 is installed in the air inlet hole.

[0037] When in use, the pipe joint 19 is connected to the air compressor (not shown in the figure) by using an external air pipe (not shown in the figure), the motor 5 is powered by the threading hole, the main lifting ring 2 is connected to the winch (not shown in the figure) by using a steel rope (not shown in the figure), and then the present invention is lowered into the immersed tube 15 by the winch until the hammer head 12 touches the ground.

[0038] Working principle:

[0039] When the hammer 12 touches the ground (the steel rope is in a relaxed state), the two T-shaped inclined sliders 3 move downward from the inside to the outside along the inclined surface under the action of the spring 17 until they press against the inner wall of the immersed tube 15, thereby fixing the suspension unit. Compressed air enters the impactor 11 through the hollow shaft 16 and the drill rod 10, and the piston (not shown in the figure) inside the impactor drives the hammer 12 to make reciprocating impact motion up and down, thereby breaking the rock. At the same time, the motor 5 drives the down-the-hole hammer to rotate through the drill rod 10 using the reduction mechanism 6, thereby achieving drilling.

[0040] After the compressed air works on the hammer head 12, it is discharged outward through the exhaust hole 13 at the bottom of the hammer head, and the broken rock chips are carried to the ground by the discharged airflow to achieve hole cleaning and slag removal. As the pile hole depth continues to increase, when the discharged airflow is not enough to carry the rock chips to the ground, they can fall back and fall into the slag collecting barrel 9 for temporary storage.

[0041] When the debris in the slag collecting barrel 9 is full, the steel rope is lifted upward, and the T-shaped inclined plane slider 3 can slide upward from the outside to the inside along the inclined plane slide groove 1-2 under the action of tension and compress the spring 17, and the outer edge surface of the T-shaped inclined plane slider 3 is out of contact with the inner wall of the immersed tube 15. When the present invention is lifted to the ground, the slag collecting barrel 9 is lifted upward for a distance through the auxiliary lifting ring 8, and the debris will automatically leak out from the bottom of the slag collecting barrel 9 to achieve slag discharge.

Claims

1. A pipe-immersed rope down-the-hole hammer, comprising a suspension unit, a slewing unit and a down-the-hole hammer located in a pipe and fixedly connected in sequence from top to bottom, wherein the down-the-hole hammer is composed of a hammer head threadedly connected to an impactor, and characterized in that: The suspension unit is composed of a base (1) having two T-shaped inclined surface grooves (1-2) distributed downwardly from the inside to the outside on the surface, a T-shaped inclined surface slider (3) installed in each T-shaped inclined surface groove (1-2), a pressing block (18) fixed on the surface of the base (1) and closing each T-shaped inclined surface groove (1-2), a spring (17) located between the pressing block (18) and the corresponding T-shaped inclined surface slider (3), and a main suspension ring (2) fixed on each T-shaped inclined surface slider (3), the surface of the base (1) is provided with an air inlet hole and a threading hole, and the circumferential surface of the base is provided with a plurality of crescent-shaped exhaust grooves (1-1); The rotary unit is composed of a shell (4) fixed to the back of the base (1), a hollow shaft (16) vertically installed in the shell and connected to the air inlet, a motor (5) fixed in the shell (4) and driving the hollow shaft to rotate through a speed reduction mechanism (6), and a connecting screw sleeve (7) fixed to the lower end of the hollow shaft (16); The down-the-hole hammer is connected to the connecting screw sleeve (7) via a drill rod (10).

2. The immersed tube type wireline down-the-hole hammer according to claim 1, characterized in that: The lower end of the drill rod (10) is in a "convex" shape, and a slag collector is mounted on the drill rod; the slag collector is composed of a slag collecting cylinder (9) in a funnel-shaped structure, two cross-shaped brackets (14) fixed in the slag collecting cylinder from top to bottom, and two sliding sleeves (20) fixed at the center of each bracket (14) and sleeved on the drill rod (10).

3. The immersed tube type wireline down-the-hole hammer according to claim 2, characterized in that: Two auxiliary lifting rings (8) are fixed on the slag collector.

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