CN101812971A

CN101812971A - Combined bit

Info

Publication number: CN101812971A
Application number: CN 201010128292
Authority: CN
Inventors: 龚秀刚; 张国柱; 朱亚萍; 黄敏
Original assignee: Shanghai Engineering Machinery Co Ltd
Current assignee: Shanghai Engineering Machinery Co Ltd
Priority date: 2010-03-17
Filing date: 2010-03-17
Publication date: 2010-08-25
Anticipated expiration: 2030-03-17
Also published as: CN101812971B

Abstract

The invention relates to a combined bit, comprising a rod body, an inner cutter body consisting of an inner cutter head and an inner cutter handle, wings and an outer cutter body consisting of an outer cutter body and an outer cutter handle, wherein the middle part of the rod body is provided with a grouting channel, and the inner cutter body is fixed at the lower end part of the rod body; the number of the wings is 2-6 and are uniformly distributed and fixed on the peripheral surface of the lower part of the rod body along the length direction thereof vertical to the direction of an axial central line of the rod body, and the outer cutter body is fixed on the wings; the inner cutter head in the inner cutter body and the outer cutter head in the outer cutter body are respectively welded the inner cutter handle with the outer cutter handle into a whole; the front ends of the inner cutter head and the outer cutter head are respectively provided with an inner cutting edge and an outer cutting edge; and the installation directions of the inner cutter body and the outer cutter body are rotating directions leading the inner cutter head and the outer cutter head to be installed toward the rod body. The combined bit realizes synchronous drilling and cutting of the inner cutter head and the outer cutter head, improves the operating efficiency multiply, has high bonding strength of the cutter heads and the cutter handles, reduces the wear condition of the cutter heads and the wings, and guarantees the quality of continuous walls after drilling holes.

Description

A kind of composite drill bit

Technical field

The present invention relates to the especially composite drill bit on sandy soil stratum of a kind of energy penetrating ground, can be widely used in the needs of highrise building underground installation, subway station bracing of foundation pit and river dyke reinforcing and the improvement of weak soil base or the like underground deep foundation engineering.

Background technology

Go along with sb. to guard him in urban skyscraper, Deep Foundation Pit of Metro Stations, in the process of construction of underground infrastructures such as river dyke anti-seepage reinforcing and weak soil base improvement reinforcing, the a large amount of at present SMW worker of employing method equipment are built diaphragm wall, promptly use multiple-drill press to bore pick continuously, and soil and cement paste mixed in situ stir and insert the technology that shaped steel is built the native mine dam of underground retaining, play that retaining is native, the antiseepage effect.

In the prior art, general drilling tool and the drill bit that adopts improved long-spiral drilling machine of the drill bit of multiple-drill press, as a kind of novel drilling tool, the patent No. is ZL200720070011.2, it is to adopt two helical blades to be fixed on the drilling rod leading section, three row's cutter hub cross arrangements are fixed on 2 helical blade bases, technology such as cutter head body built-up welding tungsten carbide, when multiple-drill press carries out bore operation on harder sandy soil stratum, can cause the cutter edge serious wear, cutter head comes off, quality problems such as blade wear fracture, not only influence the efficiency of construction of bore operation, and make the drilling quality instability, directly influence the construction of diaphragm wall quality.

Summary of the invention

The objective of the invention is to according to the deficiencies in the prior art, provide that a kind of drilling ability is strong, cutter head intensity height, cutter head and the fin abrasion resistance is good, boring grooving quality height and operating efficiency significantly improve composite drill bit.

The present invention is achieved through the following technical solutions:

The present invention relates to a kind of composite drill bit, the interior cutter hub that comprises the body of rod, forms by interior cutter head and interior hilt, fin, the outer cutter hub of forming by outer cutter head and outer hilt; Wherein, be provided with grouting channel in the middle of the body of rod, interior cutter hub is fixed on the bottom of the body of rod; Fin has 2-6, is fixed in uniform way on the outer peripheral face of body of rod bottom with the longitudinal center line direction of the vertical drilling pipe of its length direction, and outer cutter hub is fixed on the fin; Interior cutter head in described in the cutter hub and the outer cutter head in the outer cutter hub are integrally welded with interior hilt and outer hilt respectively; Outer cutter hub is weldingly fixed in the bottom of fin by outer hilt, and outer cutter hub is equipped with 2～4 on each fin, outside the cutter hub on the fin free end, the position of outer cutter hub is cross arrangement on position of rotation on the position of the outer cutter hub on each fin and another fin; The front end of interior cutter head and outer cutter head has interior cutting edge and outer cutting edge respectively; The installation direction of cutter hub and outer cutter hub is to make cutter head and outer cutter head in it be mounted to direction of rotation towards the body of rod in described.

The present invention can be, described in cutter hub have 2-4, the bottom of the described body of rod is provided with flange, interior cutter hub is weldingly fixed on the soffit place of the flange of the body of rod by interior hilt radial symmetric.

The present invention can also be that described interior cutter head and outer cutter head adopt induction brazing technology to be weldingly fixed on the end of interior hilt and outer hilt respectively.

The present invention can also be, the aerofoil of described each fin tilts in the same direction, with angle α=50-70 ° of the longitudinal center line of the body of rod; Angle β=0-15 between the front end flange plane of the bottom of fin and the body of rod °, and they are to be weldingly fixed on the outer peripheral face of body of rod bottom.

The present invention can also be, described outer cutter hub is weldingly fixed in the bottom of fin by outer hilt, and outer cutter hub is equipped with 2～4 on each fin, outside the cutter hub on the fin free end, the position of outer cutter hub is cross arrangement on position of rotation on the position of the outer cutter hub on each fin and another fin.

The present invention can also be that described interior cutter head and outer cutter head adopt the hard alloy steel material to make.

The present invention can also be that described interior hilt, outer hilt and fin adopt the carbon steel or low alloy steel material to make.

The present invention can also be that the free end of described fin is and the arc surface of body of rod concentric that this arc surface is provided with netted wearing layer.

Description of drawings

Below in conjunction with drawings and Examples the present invention is further described:

Fig. 1 is the structural representation of composite drill bit of the present invention;

Fig. 2 is the upward view of Fig. 1;

Fig. 3 is that the A-A of Fig. 1 is to sectional view;

Fig. 4 is that the B-B of Fig. 1 is to sectional view.

The specific embodiment

As shown in Figure 1, Figure 2, Figure 3 and Figure 4, a kind of composite drill bit, the interior cutter hub 2 that comprises the body of rod 1, forms by interior cutter head 21 and interior hilt 22, fin 3, the outer cutter hub of forming by outer cutter head 41 and outer hilt 42 4; Wherein, be provided with grouting channel 11 in the middle of the body of rod 1, be used for the perfusion of cement paste; Interior cutter hub 2 is fixed on the bottom of the body of rod 1, and interior cutter hub 2 has 2-4, and the bottom of the body of rod 1 is provided with flange 13, and interior cutter hub 2 is weldingly fixed on the soffit place of the flange 11 of the body of rod 1 by interior hilt 22 radial symmetric; Fin 3 has 2-6, is fixed in uniform way on the outer peripheral face of the body of rod 1 bottom with the longitudinal center line direction of the vertical body of rod 1 of its length direction, and outer cutter hub 4 is fixed on the fin 3; The aerofoil 31 of each fin 3 tilts in the same direction, with angle α=50-70 ° of the longitudinal center line of the body of rod 1; Between front end flange 11 planes of the bottom 32 of fin 3 and the body of rod 1 angle β=0-15 °, and they are to be weldingly fixed on the outer peripheral face 12 of the body of rod 1 bottom; The front end of interior cutter head 21 and outer cutter head 41 has interior cutting edge 211 and outer cutting edge 411 respectively; The installation direction of cutter hub 2 and outer cutter hub 4 is that its interior cutter head 21 and outer cutter head 41 are mounted to towards the direction of rotation of the body of rod 1 in described; Interior cutter head 21 in the interior cutter hub 2 and the outer cutter head 41 in the outer cutter hub 4 are integrally welded with interior hilt 22 and outer hilt 42 respectively, interior cutter head 21 and outer cutter head 41 usefulness hard alloy blocks are made, adopt induction brazing technology to be weldingly fixed on the end of interior hilt 22 and outer hilt 42 respectively, the cutter head fracture that comes off appears in the adhesion strength of cutter head 21 and interior hilt 22 and outer cutter head 41 and outer hilt 42 in effectively increasing when cutting edge 211 and outer cutting edge 411 are dug hard material such as stone in preventing at brill; Outer cutter hub 4 is weldingly fixed in the bottom 32 of fin 3 by outer hilt 42, and outer cutter hub 4 is equipped with 2～4 on each fin 3, outside the cutter hub 4 on fin 3 free ends, the position of outer cutter hub 4 is cross arrangement on position of rotation on the position of the outer cutter hub 4 on each fin 3 and another fin 3, promptly the fixed-site of an exclusive cutter hub 4 is arranged in the space of cutter hub 4 outside adjacent two at another, can dig earth and sandy soil by all also even ground auger to guarantee composite drill bit in drilling process; Interior hilt 22, outer hilt 42 and fin 3 adopt the carbon steel or low alloy steel material to make, and can increase its intensity; The free end of fin 3 is and the arc surface of the body of rod 1 concentric that this arc surface is provided with netted wearing layer 33, slows down the abrasion condition of fin 3, effectively improves the bored pile quality; The installation direction of interior cutter hub 2 and outer cutter hub 4 is that its interior cutter head 21 and outer cutter head 41 are mounted to towards the direction of rotation of the body of rod 1, up carries earth slurry or sandy soil slurry when helping bore operation.

Composite drill bit of the present invention by cutter hub in being provided with and two layers of cutting of outer cutter hub cutter hub, can realize in the multiple-drill press drilling process that interior cutter head and outer cutter head synchronous drilling cut on the end of the body of rod and front end cylindrical, bore operation efficient significantly improves; Simultaneously cutter head adopts induction brazing technology to weld with hilt, has effectively improved the bond strength of cutter head and hilt, especially when harder sandy soil earth-boring operation, can avoid that cutter head comes off or bursts apart, the situation of cutter head and fin quick abrasion; On the free end arc surface of fin and body of rod concentric netted wearing layer is arranged, and guarantee the surface quality of diaphragm wall after the boring grooving.

Claims

1. composite drill bit, the interior cutter hub (2) that comprises the body of rod (1), forms by interior cutter head (21) and interior hilt (22), fin (3), the outer cutter hub of forming by outer cutter head (41) and outer hilt (42) (4); Wherein, be provided with grouting channel (11) in the middle of the body of rod (1), interior cutter hub (2) is fixed on the bottom of the body of rod (1); Fin (3) has 2～6, is fixed in uniform way on the outer peripheral face of the body of rod (1) bottom with the longitudinal center line direction of the vertical body of rod of its length direction (1), and outer cutter hub (4) is fixed on the fin (3); Interior cutter head (21) and the outer cutter head (41) in the outer cutter hub (4) in described in the cutter hub (2) are integrally welded with interior hilt (22) and outer hilt (42) respectively; The front end of interior cutter head (21) and outer cutter head (41) has interior cutting edge (211) and outer cutting edge (411) respectively; The installation direction of cutter hub (2) and outer cutter hub (4) is that its interior cutter head (21) and outer cutter head (41) are mounted to towards the direction of rotation of the body of rod (1) in described.

2. NEW TYPE OF COMPOSITE drill bit according to claim 1, it is characterized in that described interior cutter hub (2) has 2～4, the bottom of the described body of rod (1) is provided with flange (13), and interior cutter hub (2) is weldingly fixed on the soffit place of the flange (11) of the body of rod (1) by interior hilt (22) radial symmetric.

3. NEW TYPE OF COMPOSITE drill bit according to claim 1 is characterized in that described interior cutter head (21) and outer cutter head (41) adopt induction brazing technology to be weldingly fixed on the end of interior hilt (22) and outer hilt (42) respectively.

4. NEW TYPE OF COMPOSITE drill bit according to claim 1 is characterized in that the aerofoil (31) of each fin (3) tilts in the same direction, with angle α=50～70 of the longitudinal center line of the body of rod (1) °; Between front end flange (11) plane of the bottom (32) of fin (3) and the body of rod (1) angle β=0-15 °, and they are to be weldingly fixed on the outer peripheral face (12) of the body of rod (1) bottom.

5. NEW TYPE OF COMPOSITE drill bit according to claim 1, it is characterized in that described outer cutter hub (4) is weldingly fixed in the bottom (32) of fin (3) by outer hilt (42), and outer cutter hub (4) is equipped with 2～4 on each fin (3), outside the cutter hub on fin (3) free end, the position that the position of the outer cutter hub (4) on each fin (3) and another fin (3) are gone up outer cutter hub (4) is cross arrangement on position of rotation.

6. according to claim 1 or 3 described NEW TYPE OF COMPOSITE drill bits, it is characterized in that described interior cutter head (21) and outer cutter head (41) adopt hard alloy blocks to make.

7. according to claim 1 or 4 described NEW TYPE OF COMPOSITE drill bits, it is characterized in that described interior hilt (22), outer hilt (42) and fin (3) adopt the carbon steel or low alloy steel material to make.

8. according to claim 1 or 5 or 7 described NEW TYPE OF COMPOSITE drill bits, the free end that it is characterized in that described fin (3) is and the arc surface of the body of rod (1) concentric that this arc surface is provided with netted wearing layer (33).