Variable diameter modular hole hammer drill pipe

Abstract

The present application belongs to the field of down-the-hole hammer, and relates to a combined down-the-hole hammer drill rod with variable diameter, which comprises a spline drill rod and a rod cover. The spline drill rod comprises an air inlet pipe body, a male joint, a female joint and splines. The air inlet pipe body is fixed at the head and tail of the male joint and the female joint by welding. The splines are evenly welded on the air inlet pipe body. Positioning key strips are welded at the head and tail of the splines. The rod cover comprises an external pipe body, a spline board, reinforcing ribs and fixing pins. The spline board is welded inside the pipe body. The reinforcing ribs are welded on the upper and lower surfaces of the spline board and the pipe body. The positioning blocks are welded on the spline board for rotation positioning. The positioning key strips at the two ends of the spline drill rod are fixed by the fixing pins. The spline drill rod can be connected with rod covers with different diameters, so that down-the-hole hammer drilling operation can be realized for different pile hole diameters.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of down-the-hole hammer, and relates to a combined down-the-hole hammer drill rod with variable diameter. BACKGROUND

[0002] The drill rod on the down-the-hole hammer is generally welded by an internal working drill rod and an external rod cover. The overall structure of the welded drill rod is simple and has good strength. The welded drill rod is generally used in the field of down-the-hole hammer construction, such as hard rock impact breaking, fast drilling speed and high hole forming efficiency. In order to achieve good air deslagging effect, the annular gap between the drill rod and the hole has certain requirements, and different diameters of welded down-the-hole hammer drill rods need to be selected according to different hole diameters. A welded down-the-hole hammer drill rod with a fixed outer diameter specification can only adapt to a fixed diameter hole, and the internal water or impurities cannot be completely cleaned after entering the drill rod, which can easily cause internal rust and reduce the service life.

[0003] In order to realize the drilling construction of different diameters and different strata, different types and diameters of drill rods need to be matched, resulting in high matching cost. However, the down-the-hole hammer drill rod in the prior art is welded in one piece, cannot realize quick switching of the working drilling of different pile hole diameters, and cannot reduce the number of down-the-hole hammer drill rods, thereby increasing the construction cost and transportation cost. SUMMARY

[0004] In order to solve the defects that the fixed welded down-the-hole hammer drill rod has a constant diameter and length, and cannot adapt to different pile hole diameters, the present application provides a combined down-the-hole hammer drill rod with variable diameter, which has a relatively simple structure design, can realize axial and rotary positioning, and can realize quick disassembly and assembly suitable for different diameter pile hole drilling operations.

[0005] The technical scheme adopted by the present application is as follows:

[0006] A combined down-the-hole hammer drill rod with variable diameter, comprising a spline drill rod and a rod cover, the spline drill rod comprising an air inlet pipe body, a male joint, a female joint and a spline, the air inlet pipe body being fixed at the head and tail of the male joint and the female joint by welding, the spline being uniformly welded on the air inlet pipe body, and the spline being welded with a positioning key strip at the head and tail; the rod cover comprising an external pipe body, a spline board, a reinforcing rib and a fixing pin, the spline board being welded inside the pipe body, the reinforcing rib being welded on the upper and lower surfaces of the spline board and the pipe body, the positioning block being welded on the spline board for rotary positioning, and the positioning key strip at the two ends of the spline drill rod being fixed by the fixing pin.

[0007] Further, a groove is formed around the spline board, so that the spline and the positioning key strip are matched and inserted or pulled out.

[0008] Further, the spline drill rod is inserted into the groove around the spline board through the spline and the positioning key bar, cooperates with the spline board through the gap between the spline and the positioning key bar, and then rotates by a certain angle, so that the positioning key bar is attached to the positioning block and is fixed through the fixing pin, the rotation positioning is realized, and the upper and lower surfaces of the spline board are tightly attached to the spline gap to realize the upper and lower fixation.

[0009] Further, the spline is uniformly welded on the 90-degree curved surface of the air inlet pipe body.

[0010] Further, the spline and the spline and the positioning key bar are axially left with the same gap.

[0011] Further, the spline and the positioning key bar are axially parallel.

[0012] Further, the positioning key bar has a positioning hole.

[0013] Further, the spline board has a hole through which the spline drill rod can pass.

[0014] Further, the surface of the spline board is tightly attached to the spline or the groove between the spline and the positioning key bar.

[0015] Beneficial effects

[0016] Due to the spline shaft structure of the present application, the spline drill rod is inserted and rotated to realize the up-down and rotation positioning, thereby achieving the technical effect of rapid disassembly;

[0017] Due to the spline drill rod structure of the present application, it is suitable for the same length and different diameter of the pneumatic hammer rod clothes, thereby achieving the technical effect of generalization and modularization;

[0018] Due to the spline board groove structure of the pneumatic hammer rod clothes of the present application, it can act as a drainage groove during work, thereby achieving the technical effects of effective drainage and dust cleaning and reducing rust.

[0019] The present application provides a general length consistent working drill rod and different diameter pneumatic hammer rod clothes which are mechanically assembled to realize rapid switching to realize different pile hole diameter operation drilling, which can greatly reduce the labor intensity of workers, reduce production cost and procurement cost, and improve the utilization rate of pneumatic hammer drill rod. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 is the sectional view of the combined pneumatic hammer drill rod of the present application.

[0021] Fig. 2 is the partial axonometric view of the combined pneumatic hammer drill rod of the present application.

[0022] Fig. 3Is the spline drill pipe of the application.

[0023] Fig. 4 Is the rod clothing of the application. DETAILED DESCRIPTION

[0024] As Figs. 1-4 shown, a variable diameter combined drill rod for a down-the-hole hammer, comprising a spline drill rod 1 and a rod clothing 2, the spline drill rod 1 comprising an air inlet pipe body 101, a male joint 102, a female joint 103 and splines 104, the air inlet pipe body 101 being fixed at both ends with the male joint 102 and the female joint 103 by welding, the splines 104 being evenly welded on the air inlet pipe body 101 as a whole, and the splines 104 being welded with positioning key strips 105 at both ends; the rod clothing 2 comprising an external pipe body 201, a spline board 202, reinforcing ribs 203 and fixing pins 206, the spline board 202 being welded inside the pipe body 201, and the reinforcing ribs 203 being welded on the upper and lower surfaces of the spline board 202 and the pipe body 201; the spline board 202 being welded with rotating positioning positioning blocks 205, and the positioning key strips 105 at both ends of the spline drill rod 1 being fixed through the fixing pins 206; the spline drill rod 1 being inserted into the grooves of the spline board 202 of the rod clothing 2 through the splines 104 and the positioning key strips 105, and then being rotated by a certain angle to cooperate with the spline board 202 through the gap between the splines 104 and the positioning key strips 105 of the spline drill rod 1, so that the positioning key strips 105 on the spline drill rod 1 are attached to the positioning blocks 205 of the rod clothing 2 and are fixed through the fixing pins 206, realizing rotating positioning, and the upper and lower surfaces of the spline board 202 are tightly attached to the splines 104 of the spline drill rod 1 at the gap, realizing upper and lower fixation; the material of the pipe body 201 is Q355B, which has good wear resistance.

[0025] The four splines 104 and four positioning key strips 105 are evenly welded on the curved surface of the air inlet pipe body 101 at 90°, and the longitudinal splines 104 are spaced apart by more than 10mm between the splines and the positioning key strips 105, and the material of the splines 104 and the positioning key strips is Q355B, which has better strength and hardness;

[0026] The splines 104 and the positioning key strips 105 are axially parallel, the positioning key strips 105 have positioning holes, and the positioning holes and the positioning blocks 205 are used for fixation, having the effect of preventing shaking during work rotation;

[0027] The spline board 202 is provided with a hole through which the spline drill rod 1 can pass, and the spline board 202 is provided with grooves around the hole, so that the splines 104 and the positioning key strips 105 can be inserted or pulled out in cooperation;

[0028] The surface of the spline board 202 is closely fitted with the groove between the spline 104 and the positioning key bar 105 of the spline drill rod 1;

[0029] The working principle of the embodiment is as follows:

[0030] As a variable-diameter combined drill rod matched with a conventional large-diameter positive circulation down-the-hole hammer, the spline 104 of the spline drill rod 1 is inserted into the groove of the spline board 202 of the rod cover, so that the upper and lower surfaces of the spline board 202 on the upper and lower ends of the rod cover 2 and the gap between the spline 104 and the positioning key bar 105 of the spline drill rod 1 and the gap between the splines 104 are closely fitted, then the spline drill rod 1 is rotated by a certain angle, so that the side surface of the positioning key bar 105 of the spline drill rod 1 is just fitted with the side surface of the positioning block 205 welded on the spline board 202 on the upper and lower ends of the rod cover 2, then the fixing pin 206 is used for fixing, so that it becomes a variable-diameter combined drill rod of the conventional down-the-hole hammer, so that the up-down positioning and rotary positioning can be realized during the down-the-hole hammer drilling process, and the effect of resisting up-down impact vibration and rotary torsion is good; the groove of the spline board 202 can play a role in draining water and reducing internal rust; under different construction strata and different pile hole diameters, the spline drill rod 1 and the rod cover with different diameters can quickly realize the switching function, and the disassembly and assembly are convenient, and the maintenance is easier.

[0031] The content described in the embodiment of the application is only a list of implementation forms of the inventive concept, and the protection scope of the application should not be regarded as being limited to the specific forms stated in the embodiment, and the protection scope of the application is also based on the equivalent technical means that can be thought of by the person skilled in the art according to the inventive concept.

Claims

1. A variable diameter combined down-the-hole hammer drill rod, characterized in that, The device includes a spline drill rod and a rod cover. The spline drill rod comprises an intake pipe body, a male connector, a female connector, and splines. The intake pipe body is fixed to the male and female connectors at both ends by welding. The splines are uniformly welded to the intake pipe body, and positioning key strips are welded to the ends of the splines. The rod cover comprises an outer tube body, a spline keypad, reinforcing ribs, and fixing pins. The spline keypad is welded to the inside of the tube body, and the reinforcing ribs are welded to the upper and lower surfaces of the spline keypad and the tube body. A positioning block for rotational positioning is welded to the spline keypad and fixed to the positioning key strips at both ends of the spline drill rod by fixing pins. Grooves are formed around the periphery of the spline keypad to allow the splines and positioning key strips to be inserted or removed. The spline drill rod is located in the middle of the spline keypad. The spline drill rod, through which the spline and positioning key strip are inserted, is inserted into the groove around the spline key. It engages with the spline key through the gap between the spline and positioning key strip, and then rotates at a certain angle, causing the positioning key strip to fit against the positioning block and be fixed by a fixing pin, thus achieving rotational positioning. The upper and lower surfaces of the spline key are tightly fitted with the gap between the splines, achieving vertical fixation. The spline key is distributed along the axial direction of the rod. The surfaces of the spline key at the upper and lower ends of the axial direction tightly engage with the groove between the spline key and the positioning key strip, and the surface of the spline key in the middle of the axial direction tightly engages with the groove between the spline key and the positioning key strip. Four splines and four positioning key strips are evenly welded at 90° intervals on the curved surface of the intake pipe. The longitudinal spacing between splines and between splines and positioning key strips is more than 10mm.

2. The variable diameter combined down-the-hole hammer drill rod as described in claim 1, characterized in that: The spline is axially parallel to the positioning key bar.

3. The variable diameter combined down-the-hole hammer drill rod as described in claim 1, characterized in that: The positioning key strip has positioning holes.

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