CN201232525Y

CN201232525Y - Down-the-hole drill

Info

Publication number: CN201232525Y
Application number: CNU2008200267667U
Authority: CN
Inventors: 李保顺
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-08-05
Filing date: 2008-08-05
Publication date: 2009-05-06
Anticipated expiration: 2018-08-05

Abstract

The utility model discloses a down-the-hole drill bit which comprises a drill bit; the head end of the drill bit is provided with a large plane; the periphery of the large plane is provided with a circular inclined surface; the peripheral surface of the drill bit is uniformly provided with a plurality of discharge grooves; the inclined surface is uniformly provided with a plurality of side teeth which are lined at intervals with the discharge grooves; the large plane is provided with a plurality of inner teeth and two air holes communicated with an internal air duct of the drill bit; the large plane is respectively provided with discharge bevel grooves communicated with the two air holes and two discharge grooves, and the two air holes are arranged on a straight line in the center of the large plane. The down-the-hole drill bit can greatly reduce the torsion force and the impact born by single teeth, so that the side teeth are less worn, the chiseling speed can be correspondingly improved, so as to have good cooling effect to all the teeth and greatly prolong the service life of the drill bit.

Description

Down-the-hold drill bit

Technical field

The utility model relates to mine engineering down-the-hole drilling tool, especially a kind of down-the-hold drill bit of holing on hard (f=8～10) above rock of being used for.

Background technology

At present, known down-the-hold drill bit mostly is pore that the head end at drill bit is provided with and the sludge groove of connecting with pore as the head construction of 115 type drill bits, the heel teeth that certain angle is distributed with is arranged in a circumferential direction and on the head end mid-plane, be provided with a kind of like this cloth tooth principle of internal tooth, and all identical cloth teeth that carry out of quantity that adopt by heel teeth and internal tooth setting more, and for the drilling tool of this pattern, under the certain situation of torque-on-bit, since each tooth of edge with the contact area of rock and rotating speed on all greater than internal tooth, the moment of torsion that each heel teeth bore also can substantially exceed the moment of torsion that each internal tooth bears like this, cause on middle hard rock, punching, the heel teeth wearing and tearing are very fast, cutter speed is low, and bit life is short.The layout of pore and sludge groove is also unreasonable on the drill bit head end simultaneously, and it is not smooth to cause the rock slag to discharge, increased to repeat fragmentation, and also relatively poor by the gas of pore ejection to the cooling effect of each tooth, this also greatly reduces the application life of drill bit.

Summary of the invention

Technical problem to be solved in the utility model has provided a kind of torsional forces and impact that can reduce monodentate greatly and born, make the heel teeth wearing and tearing little, can corresponding raising cut a hole speed, thus and the down-the-hold drill bit that prolongs bit life greatly that each tooth is had favorable cooling effect.

For solving the problems of the technologies described above, the technical solution of the utility model is: down-the-hold drill bit, comprise bit body, described bit body head end is provided with big plane, big plane periphery is provided with the inclined-plane, described bit body outer surface evenly is provided with some sludge grooves, evenly being provided with some heel teeths and described heel teeth and sludge groove space on the described inclined-plane arranges, described big plane is provided with the pore that some internal tooths and two are communicated with the inner air flue of bit body, described big plane is provided with two row's powder skewed slots, described two row's powder skewed slots are communicated with two in described two pores and the described sludge groove respectively, and the line between the described two pore centers passes described big planar central.

As further improvement, described bit body head end diameter is 114mm, described sludge groove and heel teeth are respectively 8, described internal tooth is 6, described heel teeth sphere diameter is 14mm, described internal tooth sphere diameter is 13mm, it is on the 102mm circumference that described heel teeth is uniformly distributed in diameter, in the described internal tooth 4 to be uniformly distributed in diameter be on the 75mm circumference and this 4 internal tooth respectively and the angle between the adjacent heel teeth be 22.5 °, and in addition two to be distributed in same straight line and to lay respectively at diameter be 48mm, on the 22mm circumference, and this two internal tooth and to be distributed in diameter be that angle is 45 ° between the adjacent internal tooth on the 75mm circumference.

As further improvement, the angle between described big plane and the described inclined-plane is 35 °～45 °.

As further improvement, the angle between described row's powder skewed slot and the described big plane is 15 °.

As further improvement, sludge groove is that section radius is the elongated slot of 12mm arcuation on the described bit body circumferencial direction.

As further improvement, described bit body head end is provided with the back taper inclined-plane that is 10 ° of angles with the bit body axis.

The down-the-hold drill bit of technique scheme, each tooth is evenly distributed on bit face, and the broken scar that is bearing about equally is long-pending, be evenly distributed to guarantee that each tooth is stressed when breaking rock, avoid heel teeth unbalance stress and early damage when rock drilling, when punching on middle hard rock like this, the heel teeth wearing and tearing are less, cutter speed can correspondingly improve, and bit life is long.And the design of pore on the end face, row's powder skewed slot and sludge groove can make the rock slag discharge smoothly, has avoided repeating broken, has improved simultaneously by the gas of the pore ejection cooling effect to each tooth, has prolonged the application life of drill bit greatly.

Description of drawings

Below in conjunction with accompanying drawing the specific embodiment of the present utility model is further described.

Fig. 1 is the structural representation of the utility model down-the-hold drill bit;

Fig. 2 be among Fig. 1 A-A to sectional view.

The specific embodiment

As depicted in figs. 1 and 2, down-the-hold drill bit, comprise bit body 5, head end at bit body 5 is provided with big plane 3, be provided with ring-type inclined-plane 1 in the periphery that is positioned at big plane 3, angle between inclined-plane 1 outward-dipping and big plane 3 and the inclined-plane 1 is 35 °～45 °, can adopt 35 ° design, evenly be provided with some sludge grooves 11 at bit body 5 outer surfaces, sludge groove 11 adopts and extends axially mode setting along bit body 5, evenly being provided with some heel teeths 12 and heel teeth 12 on the inclined-plane 1 arranges with sludge groove 11 spaces, on big plane 3, be provided with the pore 4 that some internal tooths 31 and two are communicated with bit body 5 inner air flues, big plane 3 is provided with two that two row's powder skewed slots, 41, two row's powder skewed slots 41 are communicated with respectively in two pores 4 and the sludge groove 11, and the line between two pores, 4 centers passes 3 centers, described big plane.And heel teeth 12 and internal tooth 31 are respectively the hemispherical post dentation that adopts alloy to make, when punchinging operation, by bit body 5 each heel teeth of carrying, internal tooth and transmission ballistic work, be used for fractured rock by each heel teeth and internal tooth, and because the angle between big plane 3 and the inclined-plane 1 is 35 °, so heel teeth 12 is also outward-dipping, and heel teeth 12 and internal tooth 31 are respectively the hemispherical post dentation that adopts alloy to make, bit freezing when having prevented operation, and because the heel teeth condition of work is abominable, quick abrasion, thus the sphere diameter of the sphere diameter of heel teeth 12 adopted greater than internal tooth 31, with the intensity and the application life of improving each tooth.And can adopt adjacent each heel teeth and or internal tooth between center to center distance greater than 1.5～2 times of each tooth sphere diameter, make between cog stress as far as possible little, guarantee permanent tooth intensity.

When actual design was used, the layout of heel teeth and internal tooth should be followed following several principles:

1, carbide alloy is evenly distributed on bit face, and the broken scar of per tooth burden is long-pending about equally;

2, each circle radially the projection on same straight line be evenly distributed, the rotary motion trace of the tooth on the adjacent circumferential when rotating has suitable overlapping;

3, because the heel teeth condition of work is abominable, and line of motion speed is big, heel teeth should adopt big specification alloy;

4, the center to center distance between adjacent each tooth and the tooth should be greater than 1.5～2 times of tooth diameter, make between perforation stress as far as possible little.

The down-the-hold drill bit of concrete a kind of as 115 types, it is 114mm that this bit body 5 adopts the head end diameter, angle between big plane 3 and the inclined-plane 1 adopts 35 ° design, heel teeth 12 is also outward-dipping like this, and be provided with a back taper inclined-plane at bit body 5 head end diameter of phi 114 places, this back taper inclined-plane and bit body axis are 10 ° of angles, to prevent the bit freezing phenomenon; Sludge groove 11 and heel teeth 12 are respectively 8, internal tooth 31 then is 6, heel teeth 12 sphere diameters are 14mm, internal tooth 31 sphere diameters are 13mm, 8 heel teeths 12 are uniformly distributed in diameter of phi 1 on the 102mm circumference, distribute with 45 ° of angles, 4 are uniformly distributed in diameter of phi 2 for distributing with 90 ° of angles on the 75mm circumference in the internal tooth 31, and this 4 internal tooth respectively and the angle between the adjacent heel teeth be 22.5 °, and in addition two be distributed in same straight line and lay respectively at diameter of phi 3 and be 48mm, Φ 4 is on the 22mm circumference, and this two internal tooth and be distributed in diameter of phi 2 and be 45 ° for angle between the adjacent internal tooth on the 75mm circumference; The such distribution on bit body 5 head ends of heel teeth and internal tooth, the rotary motion trace of the tooth on the adjacent circumferential when rotating have suitable overlapping, and metope is not stayed in rock drilling, and rock drilling is thorough; Because the heel teeth condition of work is abominable, quick abrasion is the alloy of 14mm specification so heel teeth has adopted sphere diameter, the internal tooth sphere diameter is the alloy of 13mm specification, and each tooth minimum centers-distance d is 21.8mm during the cloth tooth〉(1.5 * 14mm)=21mm so that stress is as far as possible little between each perforation, guarantees permanent tooth intensity.Two pores, 4 diameters then adopt 17mm, and the line between two pores, 4 centers passes 3 centers, big plane, like this, two pores 4, the two row's powder skewed slots 41 that are connected with two pores 4 respectively and the sludge groove that is communicated with two row's powder skewed slots 41 can be 180 ° of layouts at bit body 5 head ends, drill bit for this cloth flute profile formula, at torque-on-bit with impact under certain situation, the torsional forces that each heel teeth bore is 1/8 torque-on-bit, the torsional forces that single heel teeth bore and impact and will reduce greatly.Two branch airway of two pores, 4 connection bit bodys, 5 inner air flues slope inwardly respectively and are 21 ° with bit body 5 axis simultaneously; Angle between row's powder skewed slot 41 and the big plane 3 is 15 °, and row's powder skewed slot 41 is the elongated slot of 8mm arcuation for section radius, and sludge groove 11 is the arcuation elongated slot of 12mm for section radius on the bit body circumference, to guarantee at the drill bit duration of work, can reduce and repeat fragmentation in time with at the bottom of the rock slag tap, improve the speed of punchinging, can cool off each tooth from the gas of pore ejection, improve the life-span of drill bit.The structure design of this model down-the-hold drill bit is punched on middle hard rock, and the heel teeth wearing and tearing are less, and cutter speed can correspondingly improve, and bit life is long.

In the actual production processing and manufacturing, may there be certain mismachining tolerance in each size, angle numerical value in the utility model, within the national machining tolerance critical field that is allowed, are protection domain of the present utility model as mismachining tolerance.

Claims

1, down-the-hold drill bit, comprise bit body (5), it is characterized in that: described bit body (5) head end is provided with big plane (3), described big plane (3) periphery is provided with inclined-plane (1), described bit body (5) outer surface evenly is provided with some sludge grooves (11), evenly being provided with some heel teeths (12) and described heel teeth (12) on the described inclined-plane (1) arranges with sludge groove (11) space, described big plane (3) is provided with the pore (4) that some internal tooths (31) and two are communicated with the inner air flue of bit body (5), described big plane (3) is provided with two row's powder skewed slots (41), described two row's powder skewed slots (41) are communicated with two in described two pores (4) and the described sludge groove (11) respectively, and the line between described two pores (4) center passes center, described big plane (3).

2, down-the-hold drill bit according to claim 1, described bit body (5) head end diameter is 114mm, described sludge groove (11) and heel teeth (12) are respectively 8, described internal tooth (31) is 6, described heel teeth (12) sphere diameter is 14mm, described internal tooth (31) sphere diameter is 13mm, it is on the 102mm circumference that described heel teeth (12) is uniformly distributed in diameter, in the described internal tooth (31) 4 to be uniformly distributed in diameter be on the 75mm circumference and this 4 internal tooth respectively and the angle between the adjacent heel teeth be 22.5 °, and in addition two to be distributed in same straight line and to lay respectively at diameter be 48mm, on the 22mm circumference, and this two internal tooth and to be distributed in diameter be that angle is 45 ° between the adjacent internal tooth on the 75mm circumference.

3, as down-the-hold drill bit as described in the claim 2, it is characterized in that: the angle between described big plane (3) and described inclined-plane (1) is 35 °～45 °.

4, as down-the-hold drill bit as described in the claim 2, it is characterized in that: the angle between described row's powder skewed slot (41) and the described big plane (3) is 15 °.

5, as down-the-hold drill bit as described in the claim 2, it is characterized in that: sludge groove (11) is the elongated slot of 12mm arcuation for section radius on the described bit body circumferencial direction.

6, as down-the-hold drill bit as described in each in the claim 1 to 5, it is characterized in that: described bit body (5) head end is provided with the back taper inclined-plane that is 10 ° of angles with the bit body axis.