JP3027322U - Down the hole hammer that enables rotation in both left and right directions - Google Patents

Abstract

(57) [Abstract] [Problem] To provide a down-the-hole hammer capable of rotating in both left and right directions. A down the hole hammer (1) according to the present invention comprises a top sub (10) and a wear sleeve (8).
And the driver sub (5) are sequentially connected, and at this time, either or both of the connecting portion between the top sub and the wear sleeve and the connecting portion between the wear sleeve and the driver sub are connected by a spigot joint (6, 7) having a polygonal cross section. Along with the connection, the knock pin (11) is driven into the engagement surface so as to support the shearing force, which enables rotation in both left and right directions.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a down-the-hole hammer, which is an impact type tip drive type drill, which is a type of impact type boring machine.

[0002]

[Prior art]

 The down the hole hammer was constructed by connecting the top sub, wear sleeve and driver sub in this order, but the top sub and wear sleeve and the wear sleeve and driver sub were connected by screws. Therefore, the rotation of the down-hole hammer was limited to the right-handed or left-handed connection and could only be used for specific tasks. Approximately 80% of this type of equipment is a right-handed type, and left-handed type is often used with a percussion drilling type boring machine, but in order to handle all work, these two types of equipment are prepared. There was a need.

As shown in FIGS. 6 to 9, the down the hole hammer 31 includes a driver sub 32, a wear sleeve 42, and a top sub 45.

The driver sub 32 includes a cylindrical cutting tool 33 and a tubular sleeve 38. The cutting tool 32 has a considerable length, has an axial hole, has a bit 35 made of cemented carbide or the like at the tip of the large diameter portion 34, and has a spline 37 formed at the rear small diameter portion 36. . The sleeve 38 has a large diameter portion 39 and a small diameter portion 40, a spline (not shown) that cooperates with the spline 37 of the cutting tool 33 is provided inside the large diameter portion 39, and the small diameter portion 40 has an outer periphery. Is provided with a screw 41.

The wear sleeve 42 is tubular and of considerable length and has a screw 44 cooperating with the screw 41 at one end of its axial bore 43. A screw (not shown) is also provided at the other end of the axial hole.

The top sub 45 has a tubular large diameter portion 46 and a small diameter portion 47. The large diameter portion 46 is provided with a wrench groove 48 for applying a tool such as a wrench for screwing back, and the small diameter portion 47. Is provided with a screw 49 on the outer circumference.

After the cutting tool 33 is inserted into the sleeve 38 and the driver sub 32 is assembled by connecting the cutting tool 33 with the spline 37 of the cutting tool 33 and the spline of the sleeve 38 (not shown), the screw on the driver sub 32 side, that is, the sleeve 38. The screw 41 of 4 is screwed into the screw 43 of the wear sleeve 42 to connect the driver sub 32 and the wear sleeve 42. Further, the screw 49 of the top sub 45 is screwed into and fixed to a screw (not shown) of the wear sleeve 42 to complete the assembly.

By the axial holes of the top sub 45, the wear sleeve 42, and the driver sub 32, compressed air or cooling water for generating an impact can be transported.

[0009]

[Problems to be solved by the device]

 Down the hole hammer has two sets of screws.For example, if one screw is right-handed, the other screw is also right-handed, and both screws are screwed in a direction other than the direction in which those screws are tightened. Cannot be provided.

Therefore, in order to handle excavation work, it is necessary to provide two types of devices, which requires a large amount of expense. In addition, screwing and unscrewing at the time of disassembly and assembly for maintenance of the device requires a considerable amount of labor and time.

The present invention enables easy and quick disassembly and assembly, is rotatable in both left and right directions, can be quickly adapted to various excavation work, and can withstand a sufficiently large load. The purpose is to provide a down the hole hammer that can be used.

[0012]

[Means for Solving the Problems]

 According to the present invention, the above object is to provide a down-the-hole hammer in which a top sub, a wear sleeve, and a driver sub are sequentially connected to each other, and to connect either the top sub and the wear sleeve or the wear sleeve and the driver sub. Can be achieved by a down-the-hole hammer in which both are connected by a spigot joint having a polygonal cross section, and a knock pin is driven into the engaging surface to support the shearing force.

According to the present invention having the above-mentioned structure, since the shearing force is supported by the corner portion of the spigot joint and the knock pin, the rotating force can be transmitted regardless of the left and right rotating directions. .

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION

 As shown in FIGS. 1 to 5, the down the hole hammer 1 according to the present invention comprises a driver sub 2, a wear sleeve 12, and a top sub 18.

The driver sub 2 includes a cylindrical cutting tool 3 and a tubular sleeve 8. The cutting tool 3 has a considerable length, has an axial hole, has a bit 5 of cemented carbide or the like at the tip of the large diameter portion 4, and a spline 7 is formed at the rear small diameter portion 6. Has been done. The sleeve 8 is composed of a large diameter portion 9 and a small diameter portion 10. A spline (not shown) that cooperates with the spline 7 of the cutting tool 3 is provided in the large diameter portion 9, and the small diameter portion 10 has a polygonal cross section. Has been formed. Grooves 11 are formed on the two facing surfaces of the small diameter portion 10 (only one is shown).

The wear sleeve 12 is tubular and has a considerable length, and its axial hole 13 corresponds to the outer shape of the small diameter portion 10 having the polygonal cross section (octagon in the illustrated example) over the entire length. It has a shape and dimensions Also, holes 15, 15 ', 17, 17' for receiving knock pins 14.14 'and 16, 16' are formed at two upper and lower positions on the opposite side in the diametrical direction, parallel to the plane of the outer periphery of the polygon and perpendicular to the axis. It is provided at the upper end and the lower end of the wear sleeve 12. It is preferable that the holes 15, 15 ', 17 and 17' are vertically displaced slightly in order to receive the torque.

The top sub 18 has a large-diameter portion 19 and a small-diameter portion 20. The large-diameter portion 19 is provided with a wrench groove 21 for applying a tool such as a wrench to unscrew the screw S 1, and the small-diameter portion. 20 is formed in a shape and size corresponding to the polygonal hole and is provided with a groove 22.

Although the top sub 18 is attached by the screw S in the example of FIG. 1, it may be pin-coupled by providing a pin hole 18b as shown in FIG.

The outer circumference of the polygonal cross section of the small diameter portion 10 of the sleeve 8 of the driver sub 2 and the small diameter portion 20 of the top sub 18 and the axial hole 13 of the wear sleeve 12 cooperate to form a spigot joint.

Since the cross-section of the spigot joint is polygonal, torque can be transmitted. In order to increase the strength against torque load, the holes 15, 15 ', 17, 17' of the knock pin 14, 14 ', 16, 16' wear sleeve 12 are provided with the grooves 10, 22 of the polygonal section 10 and 20. It is driven through to the engaging surface. The grooves 11, 22 are provided perpendicular to the axis of the down the hole hammer 1 and parallel to the corresponding faces of the polygonal cross section. By driving the knock pins 14, 14 ', 16, 16', the wear sleeve 12 and the driver sub 2 and the wear sleeve 12 and the top sub 18 are completely fixed.

After inserting the cutting tool 3 into the sleeve 8 and connecting the spline 5 of the cutting tool 3 with a spline (not shown) of the sleeve to assemble the driver sub 2, the driver sub 2 is axially inserted into the hole 13 of the wear sleeve 12. Then, the knock pins 14, 14 'are driven into the holes 15, 15' of the wear sleeve 12 to complete the assembly of the driver sub 2 and the wear sleeve 12. Next, by inserting the small diameter portion 20 of the top sub 18 into the wear sleeve 12 from the opposite side in the hole 13 in the axial direction, and further driving the knock pins 16, 16 'into the holes 17, 17' of the wear sleeve 12, Assembly of the wear sleeve 12 and the top sub 18 is completed.

As described above, the down-the-hole hammer 1 can be assembled easily and quickly by sequentially inserting the driver sub, the wear sleeve and the top sub in the axial direction, and then driving the knock pin. Disassembly of Down The Hole Hammer 1 can be accomplished easily and quickly by performing the reverse operation.

As described above, since the shearing force due to the rotation is supported by the corners of the cross-section polygon of the spigot joint and the knock pins 16 and 16 ', the rotating force can be transmitted regardless of the left and right rotation directions. I can.

[0024]

[Effect of device]

 According to the present invention, one or both of the connecting portion between the top sub and the wear sleeve and the connecting portion between the wear sleeve and the driver sub are connected by a spigot joint having a polygonal cross section, and a shearing force is supported by a knock pin. With this configuration, a down-the-hole hammer that can be rotated in both left and right directions and that is easy to disassemble and assemble was obtained.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a down the hole hammer according to the present invention.

FIG. 2 is a partial cross-sectional side view of a sleeve.

3 is a sectional view taken along the line AA of FIG.

FIG. 4 is a partial cross-sectional side view of a wear sleeve.

FIG. 5 is a diagram showing another example of the top sub.

FIG. 6 is an exploded perspective view of a conventional down the hole hammer.

FIG. 7 is a partial cross-sectional side view of the sleeve.

8 is a cross-sectional view taken along the line AA of FIG.

FIG. 9 is a partial cross-sectional side view of the wear sleeve.

[Explanation of symbols]

 1 ... Down the hole hammer 2 ... Driver sub 3 ... Excavation tool 4 ... Large diameter part (of excavation tool) 5 ... Bit 6 ... Small diameter part (of excavation tool) 7 ... Spline 8 ... Sleeve 9 ... (Sleeve) large diameter portion 10 ... (Sleeve) small diameter portion 11 ... (Knock pin) groove 12 ... Wear sleeve 13 ... Polygonal cross section Axial hole 14 ... Knock pin 15 ... (Knock pin) hole 16 ... Knock pin 17 ... (Knock pin) hole 18 ... Top sub 19 ... (Top sub) large diameter part 20 ... Small diameter part (of top sub) 21 ... Wrench groove 22 ... (knock pin) groove 32 ... Driver sub 33 ... Cutting tool 37 ... Spline 38 ... Sleeve 41. ..Screws 45 ... Pusabu 48 ... wrench groove 49 ... screw

Claims (1)

[Scope of utility model registration request] 1. A down-the-hole hammer (1) in which a top sub (18), a wear sleeve (12) and a driver sub (2) are connected in order, and a connecting portion between the top sub and the wear sleeve and a connecting portion between the wear sleeve and the driver sub. Either one or both of them are connected via a spigot joint (10, 13, 20) with a polygonal cross section, and a knock pin is driven into the engaging surface to support the shearing force, enabling rotation in both left and right directions. Down the hole hammer.