CN201763248U

CN201763248U - Double-cone double spiral bit for rotary drill

Info

Publication number: CN201763248U
Application number: CN2010205199447U
Authority: CN
Inventors: 曾广胜; 李新桥; 鲁纪鸣; 许超; 姜炎炼
Original assignee: 李新桥
Priority date: 2010-09-07
Filing date: 2010-09-07
Publication date: 2011-03-16
Anticipated expiration: 2020-09-07

Abstract

A double-cone double spiral bit for a rotary drill comprises a core shaft tube and a flange, wherein the flange is disposed at an upper end of the core shaft tube. The upper portion of the core shaft tube is like a cylinder, and the lower portion of the core shaft tube is in the shape of a cone. Two sides of an axial section of the core shaft tube have a wave shape. The periphery of the core shaft tube is provided with two spiral blades in mutually staggered arrangement. Upper ends of the two spiral blades are both connected with an upper plate, and lower ends of the two spiral blades both with a lower plate. The upper plate is fixed to the upper portion of the core shaft tube, and the lower plate to the lower portion of the core shaft tube. Lower halves of the two spiral blades are both provided with bullet picks II which are uniformly distributed. A lower base plane of the core shaft tube is equipped with bullet picks III. The periphery of the lower cone of the core shaft tube is provided with bullet picks I which are uniformly distributed. The double-cone double spiral bit for the rotary drill of the utility model, which is strong in drilling ability, good in adaptability, high in working efficiency, low in energy consumption and long in service lifetime, is capable of working not only in common soil layers and sand layers, but also in bedrock formations with high rigidity and boulder layers.

Description

Rotary drilling rig bipyramid double helix drill bit

The utility model relates to the short augers that a kind of rotary drilling rig is used, and especially relates to rotary drilling rig bipyramid double helix drill bit.

Background technology

Rotary drilling rig is the construction machinery of pore-forming operation in a kind of suitable building foundation engineering, is widely used in ground foundation construction workss such as urban construction, highway bridge, highrise building.Rotary drilling rig has that installed power is big, output torque is big, axial compression is big, maneuverability, high efficient construction.Rotary drilling rig is by unit head output torque and plus-pressure, and moment of torsion of being exported and plus-pressure all finally pass to drill bit.Therefore, drill bit is the vitals that can the decision rotary drilling rig better adapt to bad ground, raising work efficiency.According to the formation drilling difference, short augers is divided into short augers of embedding rock and the short augers of soil layer.Generally speaking, the short augers of embedding rock mostly is the conehead type, promptly the helical blade diameter from large to small, the short augers of soil layer mostly is forward type, i.e. helical blade equal diameters everywhere.In use there is following problem in existing short augers:

(1) because of geology is intricate, existing short augers drilling ability is poor, and compliance is not strong, when constructed in different stratum, needs frequently more bit change, inefficiency;

When (2) carrying out the rock stratum construction, the cutting edge part smear metal resistance of drill bit is big, and along with the increase of creeping into moment of torsion, drilling tool the pressure of the drill strengthens, and like this, not only can cause high energy consumption, and drill bit is damaged, and drilling life of bit is short.

The utility model content

In order to overcome the above-mentioned defective that prior art exists, the utility model provides a kind of compliance strong, and energy consumption is low, high efficiency, long service life, the rotary drilling rig bipyramid double helix drill bit that drilling ability is strong.

The technical solution of the utility model is: it comprises core tube and flange, described flange is located at the core tube upper end, described core tube top is the class cylinder, the core tube bottom is cone, two sides of the axial section of core tube are waveform, core tube's periphery is provided with the helical blade of two interlaced arrangements, two helical blades upper end all is connected with upper plate, two helical blade lower ends all are connected with lower plate, upper plate is fixed in core tube top, lower plate is fixed in the core tube bottom, two helical blade the latter halfs all are evenly equipped with sub warhead pick II, core tube lower bottom plane is provided with sub warhead pick III, and external week of described core tube lower cone is evenly equipped with sub warhead pick I.

Preferred 16 of described sub warhead pick I quantity, 16 sub warhead pick I are four column distributions, four of every row.

Two helical blade the first half should be forward type, and the latter half should be the conehead type.

Preferred three of described sub warhead pick III quantity is mutually 30～50 °.

Described sub warhead pick I, sub warhead pick II, the equal welding-on of sub warhead pick III head have tungsten-cobalt hard alloy.

The utility model combines short augers of traditional embedding rock and the short augers characteristics of soil layer, makes the bipyramid double helix drill bit can not only operation in general soil layer and sand layer, can also operation in bigger basement rock stratum of hardness and erratic boulder layer.The core tube upper end is the class cylinder; two sides of axial section are waveform; the bottom is cone; this kind design has antidetonation, slows down stressed effect, and the resistance in the time of not only can reducing to creep into is beneficial to boring; cut down the consumption of energy; and can make drilling tool pressure act on the reasonable range class, and help protecting drill bit, increase the service life.When creeping into, the smear metal fragmentation is carried out by a contact form in the tip of sub warhead pick III, helps reducing contact area, strengthens drilling ability.Simultaneously, because sub warhead pick head welding-on has tungsten-cobalt hard alloy, help increasing drill bit abrasion resistance and hardness.

The rotary drilling rig bipyramid double helix drill bit of the utility model, drilling ability is strong, and compliance is good, high efficiency, energy consumption is low, and long service life can not only operation in general soil layer and sand layer, can also operation in bigger basement rock stratum of hardness and erratic boulder layer.

Description of drawings

Fig. 1 is the utility model example structure schematic diagram.

The specific embodiment

The utility model is described in further detail below in conjunction with drawings and Examples.

With reference to accompanying drawing, present embodiment comprises core tube 4 and flange 5, described flange 5 is located at core tube 4 upper ends, described core tube 4 tops are the class cylinder, core tube 4 bottoms are cone, be evenly equipped with 16 sub warhead pick I 2 external week of described core tube lower cone, 16 sub warhead pick I 2 are four column distributions, four of every row, two sides of the axial section of core tube 4 are waveform, core tube's 4 peripheries are provided with the helical blade 7 of two interlaced arrangements, two helical blades, 7 the first half are forward type, the latter half is the conehead type, two helical blades, 7 upper ends all are connected with upper plate 6, two helical blades, 7 lower ends all are connected with lower plate 8, upper plate 6 is fixed in core tube 4 tops, lower plate 3 is fixed in core tube 4 bottoms, two helical blades, 7 the latter halfs all are evenly equipped with sub warhead pick II 8, core tube 4 lower bottom planes 1 are provided with three sub warhead pick III 10, three sub warhead pick III 10 are mutually 40 °, described sub warhead pick I 2, sub warhead pick II 8, the equal welding-on of sub warhead pick III 10 heads has tungsten-cobalt hard alloy.

When creeping into soil layer, sub warhead pick III 10 is carried out the smear metal fragmentation by a contact form, helps reducing contact area, strengthens drilling ability.Along with going deep into of creeping into, during core tube 4 and contact with soil layer, the time and do not contact, thereby help reducing to creep into resistance, cut down the consumption of energy.Simultaneously, because core tube 4 tops are the class cylinder bodily form, the lower part is conoid shape, and this kind structure has antidetonation, slows down stressed effect, makes drilling tool pressure act on the reasonable range class, thereby helps protecting drill bit, increases the service life.

The rotary drilling rig bipyramid double helix drill bit of the utility model, drilling ability is strong, and compliance is good, and it is little to creep into resistance, and high efficiency can not only operation in general soil layer and sand layer, can also operation in bigger basement rock stratum of hardness and erratic boulder layer.

Claims

1. a rotary drilling rig is with bipyramid double helix drill bit, comprise core tube and flange, described flange is located at the core tube upper end, it is characterized in that, described core tube top is the class cylinder, the core tube bottom is cone, two sides of the axial section of core tube are waveform, core tube's periphery is provided with the helical blade of two interlaced arrangements, two helical blades upper end all is connected with upper plate, two helical blade lower ends all are connected with lower plate, upper plate is fixed in core tube top, and lower plate is fixed in the core tube bottom, and two helical blade the latter halfs all are evenly equipped with sub warhead pick II, core tube lower bottom plane is provided with sub warhead pick III, and external week of described core tube lower cone is evenly equipped with sub warhead pick I.

2. rotary drilling rig according to claim 1 is characterized in that with bipyramid double helix drill bit described sub warhead pick I is 16, and 16 sub warhead pick I are four column distributions, four of every row.

3. rotary drilling rig according to claim 1 and 2 is characterized in that with bipyramid double helix drill bit two helical blade the first half are forward type, and the latter half is the conehead type.

4. rotary drilling rig according to claim 1 and 2 is characterized in that with bipyramid double helix drill bit described sub warhead pick III is three, is mutually 30 °～50 °.

5. rotary drilling rig according to claim 1 and 2 is characterized in that with bipyramid double helix drill bit described sub warhead pick I, sub warhead pick II, the equal welding-on of sub warhead pick III head have tungsten-cobalt hard alloy.