阅读说明：本技术 潜孔锤用分体式柱片复合钻头 (Split type column piece composite drill bit for down-the-hole hammer ) 是由 刘建林 王四一 赵江鹏 王传留 李泉新 于 2019-10-24 设计创作，主要内容包括：一种潜孔锤用分体式柱片复合钻头,包括花键轴和柱-片复合钻头体,所述花键轴与柱-片复合钻头体通过锥面配合以及凹凸面插接组合在一起,并使用螺钉和键槽配合,防止两者脱开,所述柱-片复合钻头体根据直径大小,采用3翼以上结构,每个刀翼唇面并排布置有数量相同的硬质合金柱齿和PDC片,柱齿顶端高出PDC片1～2mm,每个刀翼唇面旁设置有一个排渣通道和一个水眼,每个刀翼侧面安装有保径合金；由此,本发明采用分体结构,花键轴可重复使用,钻头损坏后,只需更换柱-片复合钻头体,节约了使用成本；采用柱-片复合结构,配合潜孔锤使用,对7-9级中硬岩层,可有效提高钻进效率,扩大了潜孔锤的使用范围。(Split type column sheet composite drill bit for down-the-hole hammer comprises a spline shaft and a column sheet composite drill bit body, wherein the spline shaft and the column sheet composite drill bit body are combined at through conical surface matching and concave-convex surface inserting, and are matched through a screw and a key groove to prevent the separation of the spline shaft and the column sheet composite drill bit body, the column sheet composite drill bit body adopts a structure with more than 3 wings according to the diameter, hard alloy column teeth and PDC sheets with the same quantity are arranged on the lip surface of each blade side by side, the top end of each column tooth is 1-2mm higher than the PDC sheets, slag discharge channels and water holes are arranged beside the lip surface of each blade, and the side surface of each blade is provided with a diameter-protecting alloy.)

The split type column piece composite drill bit for the kinds of down-the-hole hammers comprises a spline shaft and a column-piece composite drill bit body, and is characterized in that:

the spline shaft and the column-sheet composite drill bit body are combined at in a conical surface matching and concave-convex surface inserting mode, a plurality of splines are arranged on the periphery of the spline shaft, a tapered hole is formed in the inner side of the front end of the spline shaft, a tapered connecting column extends from the rear end of the column-sheet composite drill bit body, the tapered connecting column can extend into the tapered hole, a plurality of positioning bosses extend out of the front end of the spline shaft at intervals, a plurality of positioning grooves for containing the positioning bosses are formed in the rear end of the column-sheet composite drill bit body, concave-convex surface inserting matching is achieved through the positioning bosses and the positioning grooves, a plurality of thread through holes are formed in the periphery of the front portion of the spline shaft, a key groove is correspondingly formed in the periphery of the tapered connecting column-sheet composite drill bit body, a screw extends into the thread through holes, and the head of the screw is contained in the.

2. The split type cylindrical composite drill bit for the down-the-hole hammer as claimed in claim 1, wherein the tapered hole of the spline shaft is internally provided with th tapered surfaces which are matched with the second tapered surfaces on the tapered connecting column of the cylindrical-cylindrical composite drill bit body.

3. The split type column piece composite drill bit for the down-the-hole hammer as claimed in claim 2, wherein the large end diameter of the th conical surface is 1/2 degrees of the outer diameter of the right end surface of the spline shaft, and the taper is 2-5 degrees.

4. The split type cylindrical composite drill bit for the down-the-hole hammer as claimed in claim 3, wherein the diameter of the large end of the second conical surface is 0.3-0.5 mm larger than that of the large end of the th conical surface of the spline shaft, and the taper is equal to that of the conical surface .

5. The split type pole piece composite drill bit for the down-the-hole hammer of claim 1, wherein: the height of the positioning bosses is not less than 10mm, and the width of the positioning bosses is equal to 1/n (n is the number of the bosses) of the outer diameter of the end face of the right side.

6. The split type cylindrical composite drill bit for the down-the-hole hammer of claim 1, wherein the cylindrical-cylindrical composite drill bit body adopts a structure with more than 3 wings, a slag discharge channel with the width equivalent to that of each wing and water holes with the diameter of 6-10mm are arranged between every two wings, and a plurality of gauge alloys are arranged on the side surface of each wing.

7. The split type pole piece composite drill bit for a down-the-hole hammer of claim 6, wherein: and the lip surface of each blade in the column-blade composite bit body is provided with 1 row of hard alloy column teeth and 1 row of PDC blades side by side.

8. The split type pole piece composite drill bit for a down-the-hole hammer of claim 7, wherein: the highest point of the top end of the hard alloy columnar tooth is 1-2mm higher than that of the PDC sheet.

9. The split type pole piece composite drill bit for a down-the-hole hammer of claim 7, wherein: the hard alloy column teeth are conical teeth or spherical teeth.

Technical Field

The invention relates to the technical field of drilling machines, in particular to a split type column piece composite drill bit for down-the-hole hammers.

Background

The down-the-hole hammer is an impact load generating device in impact rotary drilling, the energy of high-pressure flushing fluid supplied by a slurry pump or compressed air supplied by an air compressor in the drilling process is utilized to directly drive the internal impact hammer to form vertical reciprocating motion, constant-frequency impact load is continuously applied to a lower drilling tool, and accordingly impact rotary drilling is achieved.

In addition, after the rock-breaking end of the drill bit is broken, the structures such as a spline connected with a down-the-hole hammer are still intact, but the structure can only be scrapped along with the drill bit, so that types of serious wastes are caused.

Therefore, the designer of the invention, in view of the defects, researches and designs split type column piece composite drill bits for down-the-hole hammers by combining experience and results of related industries for a long time through careful research and design so as to overcome the defects.

Disclosure of Invention

The invention aims to provide split type column piece composite drill bits for a down-the-hole hammer, which improve the drilling efficiency of medium hard rock strata, reduce the consumption of drilling tools and save the construction cost.

In order to achieve the purpose, the invention discloses a split type column piece composite drill bit for down-the-hole hammers, which comprises a spline shaft and a column-piece composite drill bit body, and is characterized in that:

the spline shaft and the column-sheet composite drill bit body are combined at in a conical surface matching and concave-convex surface inserting mode, a plurality of splines are arranged on the periphery of the spline shaft, a tapered hole is formed in the inner side of the front end of the spline shaft, a tapered connecting column extends from the rear end of the column-sheet composite drill bit body, the tapered connecting column can extend into the tapered hole, a plurality of positioning bosses extend out of the front end of the spline shaft at intervals, a plurality of positioning grooves for containing the positioning bosses are formed in the rear end of the column-sheet composite drill bit body, concave-convex surface inserting matching is achieved through the positioning bosses and the positioning grooves, a plurality of thread through holes are formed in the periphery of the front portion of the spline shaft, a key groove is correspondingly formed in the periphery of the tapered connecting column-sheet composite drill bit body, a screw extends into the thread through holes, and the head of the screw is contained in the.

Wherein, a th conical surface is arranged in the conical hole of the spline shaft and is matched with a second conical surface on the conical connecting column of the column-sheet composite type drill bit body.

Wherein the large end diameter of the th conical surface is 1/2 of the outer diameter of the right end face of the spline shaft, and the taper is 2-5 degrees.

The diameter of the large end of the second conical surface is 0.3-0.5 mm larger than that of the large end of the th conical surface of the spline shaft, and the taper is equal to that of the conical surface .

Wherein: the height of the positioning bosses is not less than 10mm, and the width of the positioning bosses is equal to 1/n (n is the number of the bosses) of the outer diameter of the end face of the right side.

Wherein, the column-piece composite bit body adopts a structure with more than 3 wings, a slag discharge channel with the width equivalent to that of the wing and water holes with the diameter of 6-10mm are arranged between every two wings, and a plurality of gauge protection alloys are arranged on the side surface of each wing.

Wherein: and the lip surface of each blade in the column-blade composite bit body is provided with 1 row of hard alloy column teeth and 1 row of PDC blades side by side.

Wherein: the highest point of the top end of the hard alloy columnar tooth is 1-2mm higher than that of the PDC sheet.

Wherein: the hard alloy column teeth are conical teeth or spherical teeth.

From the above, the split type column piece composite drill bit for the down-the-hole hammer has the following effects:

1. due to the arrangement of the split structure, the spline shaft can be repeatedly utilized after the drill bit is damaged, so that the use cost is saved;

2. through the special arrangement of the hard alloy column teeth and the PDC sheets, the shock resistance of the column teeth and the cutting capability of the PDC sheets are fully utilized, and the efficiency of the down-the-hole hammer in drilling the medium hard rock stratum can be effectively improved;

3. through the interference fit of the th conical surface of the spline shaft and the second conical surface of the column-sheet composite bit body, the two parts of the split type drill bit are tightly combined, and the influence on the transmission of impact power is reduced to the minimum;

4. the convex surface of the spline shaft is matched with the concave surface of the column-sheet composite drill bit body, so that the transmission of torque is ensured;

5. the spline shaft and the column-piece composite bit body are fixed together by the screw, the threaded hole of the spline shaft and the key groove of the column-piece composite bit body, so that the column-piece composite bit body is prevented from falling off when the drilling tool is lifted off the bottom of the hole.

The details of the present invention can be obtained from the following description and the attached drawings.

Drawings

Fig. 1a shows an exploded view of a split blade composite drill bit for a down-the-hole hammer of the present invention.

Figure 1b shows a partial cross-sectional view of the present invention.

FIG. 2 shows a schematic view of the spline shaft of the present invention.

FIGS. 3a, 3b, and 3c show schematic structural views of a column-plate composite bit body of the present invention.

Reference numerals:

1. the drill bit comprises a spline shaft, 2 screws, 3 post-piece composite drill bit bodies, 101 conical surfaces , 102 threaded through holes, 103 convex surfaces, 301 second conical surfaces, 302 key grooves, 303 concave surfaces, 304 blades, 305 hard alloy post teeth, 306 PDC pieces, 307 water holes, 308 gauge protection alloy and 309 slag discharge channels.

Detailed Description

Referring to fig. 1a and 1b, a split blade composite drill bit for a down-the-hole hammer of the present invention is shown.

The split type column-piece composite drill bit for the down-the-hole hammer comprises a spline shaft 1 and a column-piece composite drill bit body 3, and is characterized in that referring to fig. 1b, the spline shaft 1 and the column-piece composite drill bit body 3 are in interference fit through a conical surface, and a concave-convex surface is spliced and combined at , wherein the periphery of the spline shaft 1 is provided with a plurality of splines to realize fixed fit with a key structure of a power source, the inner side of the front end of the spline shaft 1 is provided with a conical hole, the rear end of the column-piece composite drill bit body 3 is provided with a conical connecting column in an extending mode, so that the conical connecting column can extend into the conical hole, the conical connecting column and the conical hole are in interference fit, the front end of the spline shaft 1 extends out of a plurality of positioning bosses 103 at intervals, the rear end of the column-piece composite drill bit body 3 is provided with a plurality of positioning grooves 303 for accommodating the positioning bosses, so that the concave-convex surface splicing and concave surface are realized through the positioning bosses 103 and the positioning grooves 303, the periphery of the front part of the spline shaft 1 is provided with a plurality of threaded through holes 102, the periphery of the conical connecting column-piece composite drill bit.

As shown in fig. 2, the structure and size of the spline shaft 1 connected with the down-the-hole hammer body can be matched according to the type of down-the-hole hammer used, and the th conical surface 101 is arranged in the conical hole of the spline shaft 1 and is matched with the second conical surface 301 on the conical connecting column of the column-sheet composite type bit body 3.

Wherein, the large end diameter of the th conical surface 101 is 1/2 of the outer diameter of the end surface of the right side of the spline shaft 1, and the taper is 2-5 degrees.

The height of the positioning boss 102 is not less than 10mm, and the width is approximately equal to 1/n (n is the number of the bosses) of the outer diameter of the right end face.

The diameter of the large end of the second conical surface 301 is 0.3-0.5 mm larger than that of the large end of the -th conical surface 101 of the spline shaft 1, and the conicity is kept with the -th conical surface 101.

Wherein the width of the key groove 302 is maintained with the threaded through hole 102 of the spline shaft 1.

Wherein, the concave shape, size and number of the positioning grooves 303 are equal to the positioning bosses 103 of the spline shaft 1, keeping , and the two can be completely meshed.

As shown in fig. 3a, 3b and 3c, the pillar-chip composite drill bit body 3 adopts a structure of more than 3 wings, that is, at least three blades 304 are included, the larger the diameter of the drill bit is, the larger the number of the blades 304 is, the width of the blades 304 is suitable for mounting 1 row of cemented carbide studs 305 and 1 row of PDC chips 306, a slag discharge channel 309 corresponding to the width of the blades 304 and water holes 307 with the diameter of 6-10mm should be arranged between every two blades 304, the number of the slag discharge channel 309 and the water holes 306 is equal to the number of the blades 304, and fixed amount of gauge alloy 308 is mounted on the side surface of each blade 304.

As shown in fig. 3a, 3b and 3c, 1 row of cemented carbide cylinder teeth 305 and 1 row of PDC sheets 306 are arranged side by side on the lip surface of each blade 304 in the composite bit body 3, installation gaps should be reserved between the cemented carbide cylinder teeth 305 and between the PDC sheets 306, and the installation gaps are distributed over the entire blade lip surface, preferably, the highest point of the top end of the cemented carbide cylinder teeth 305 should be higher than the highest point of the PDC sheets 306 by 1-2 mm.

The shape of the cemented carbide stud 305 may be a conical tooth or a spherical tooth according to the hardness of the formation, and the material thereof also needs to be selected in combination with the formation.

Therefore, the invention has the advantages that:

1. due to the arrangement of the split structure, the spline shaft can be repeatedly utilized after the drill bit is damaged, so that the use cost is saved;

2. through the special arrangement of the hard alloy column teeth and the PDC sheets, the shock resistance of the column teeth and the cutting capability of the PDC sheets are fully utilized, and the efficiency of the down-the-hole hammer in drilling the medium hard rock stratum can be effectively improved;

3. through the interference fit of the th conical surface of the spline shaft and the second conical surface of the column-sheet composite bit body, the two parts of the split type drill bit are tightly combined, and the influence on the transmission of impact power is reduced to the minimum;

4. the convex surface of the spline shaft is matched with the concave surface of the column-sheet composite drill bit body, so that the transmission of torque is ensured;

5. the spline shaft and the column-piece composite bit body are fixed together by the screw, the threaded hole of the spline shaft and the key groove of the column-piece composite bit body, so that the column-piece composite bit body is prevented from falling off when the drilling tool is lifted off the bottom of the hole.

It should be apparent that the foregoing description and illustrations are by way of example only and are not intended to limit the present disclosure, application or uses. While embodiments have been described in the embodiments and depicted in the drawings, the present invention is not limited to the particular examples illustrated by the drawings and described in the embodiments as the best mode presently contemplated for carrying out the teachings of the present invention, and the scope of the present invention will include any embodiments falling within the foregoing description and the appended claims.