CN103104197A

CN103104197A - Diameter-variable drill bit

Info

Publication number: CN103104197A
Application number: CN2011103742118A
Authority: CN
Inventors: 张新强
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-11-10
Filing date: 2011-11-10
Publication date: 2013-05-15

Abstract

The invention discloses a diameter-variable drill bit and aims at providing the drill pit, wherein not only can blades automatically extend to change a diameter, but also the effects of fully stirring and mud spillover prevention can be simultaneously achieved without changing of an existing cement soil mixed pile machine. Meanwhile, each drill bit can have a plurality of selections of combination of larger diameter and small diameter. The structure of the diameter-variable drill bit includes that a drill point is sleeved on a barrel body, a bearing is arranged in the center of each of both ends of the barrel body, a bearing inner ring is connected with a shaft, a square tenon on the lower end portion of the shaft is in tenon connection with a square hole in the drill point, two pairs of blade boxes are installed on the barrel body in an embedded mode, the blades are arranged in the blade boxes, a rack is arranged on one side of each blade, the shaft is connected with two gears through keys, and two opposite edges of each gear are respectively meshed with the rack of each blade. When the barrel body changes direction along with a drill bar, due to the fact that resistance of soil acts on the resistance blades on the drill point, the drill point reversely rotates relative to the barrel body to drive the shaft and the gears to rotate, and therefore the racks and the blades are enabled to extend out of the blade boxes or contract into the blade boxes. The diameter-variable drill bit can be used for piling nail-shaped cement soil mixed piles.

Description

Expansion bit

Technical field

The present invention relates to a kind of drill bit of the use of driving piles, especially relate to the cement mixing method drill bit.

Background technology

Chinese patent ZL2005-20077017.3[P] 2007-5-2, name is called Multifunction automatic diameter-enlarging drill bit, discloses a kind of drill bit that can make bit diameter enlarge or dwindle by drill bit both forward and reverse directions rotation; In " ground treatment theory and practice---the 9th national ground processed the academic discussion collected works ", " experimental study of nail type cement mixing method soft soil foundation " literary composition, with regard to this drill bit in conjunction with the bi-directional cement soil mixing pile construction technology, existing pile-forming equipment is improved, form nail-shaped two-way soil cement mixing pile.The weak point of this drill bit is to shrink blade easily to stretch the blade difficulty in soil, and whether success rate is low, open therefore need that drill bit is promoted to the ground check blade, as do not open, to manually open, each drill bit only has a kind of large path combination, if need various combination, want another bit change; In order to stop grout, must reequip existing cement-soil and stir a machine and become bi-directional cement soil mixing pile machine, make inside and outside drilling rod do respectively simultaneously forward and reverse rotation, the blade that reaches on inside and outside drilling rod is done respectively forward and reverse rotation.

Summary of the invention

The present invention has overcome above-mentioned deficiency of the prior art, provide a kind of can the automatic telescopic blade to change the drill bit of diameter, can directly use on conventional cement-soil mixing pile machine and just can not only fully stir but also can prevent grout, each drill bit can have the selection of the large path combination of multiple difference.

The present invention adopts following technical scheme: apex point is enclosed within on stack shell, when drilling rod drives stack shell change direction of rotation by flange, the resistance blade of drag effect on apex point due to soil, the relative stack shell of apex point is counter-rotated, lower end side's tenon of axle and the square hole joggle on apex point, the two ends of axle are connected with two bearings inner ring on stack shell, and the two pairs of blade caskets are inlaid in stack shell two ends, are right-angled intersection in the space and arrange.When the blade casket changes direction of rotation with stack shell, also be the rightabout rotation with stack shell with axle with two gears that key is connected, two opposite faces of each gear all with a blade casket in blade side on tooth bar engagement, make two blades be simultaneously 180 degree and oppositely stretch or shrink, thereby to make bit diameter increase or reduce.Creep into stirring vane and be positioned at below drill bit, it meets native face a downward inclination angle, produces power native and that cement paste upwards stirs in order to creeping into; The mud jacking stirring vane is positioned at above drill bit, and it meets native face has one to vertical angle, to produce downward mud jacking, to stir component, leave respectively several groups of screws on a pair of blade in office, select different screws to screw on after bolt, also just selected the piles with different footpath, as the limit position of blade hole enlargement or undergauge.

The invention has the beneficial effects as follows: drill bit can have more than a kind of hole enlargement, undergauge combination, and namely drill bit can have the function of a plurality of drill bits; Hole enlargement and undergauge be accurate and effective all, overcome the prior art undergauge easily and hole enlargement is difficult, and often need drill bit to be promoted to the inconvenience that ground artificial is opened, and will not have cement-soil mixing pile machine now and be transformed into the opposite equipment that rotates of inside and outside drilling rod, just can reach the anti-grout of mud jacking and stir sufficient effect.Because meeting native face, the mud jacking stirring vane has one to vertical angle, produce a downward mud jacking component, creep into simultaneously stirring vane one downward inclination angle is arranged, the component that the handlebar soil body and cement paste make progress, at the mud jacking stirring vane with creep into the soil body between stirring vane except the power that stirs with the drill bit circumference, also have the power that stirs up and down, the soil body and cement paste are stirred more abundant, to sum up analyze, the present invention is more effective than prior art as can be known, function is more, cost is lower.

Description of drawings

Fig. 1 is sectional view of the present invention;

Fig. 2 is the B-B sectional view of Fig. 1, and arrow is the stack shell direction of rotation

Schematic diagram when upper figure is the stirring vane contraction

Schematic diagram when figure below is the stirring vane expansion.

Fig. 3 is resistance blade top view

The specific embodiment

The invention will be further described below in conjunction with accompanying drawing and the specific embodiment

Fig. 1, Fig. 2 is embodiments of the invention, stack shell 8 is connected with drilling rod with flange 2, outer ring with bearing 1 on flange 2 coordinates, the inner ring of bearing 1 is connected with an end of axle 7, there is a hole at the center of flange, slurry pipe 3 passes drilling rod and this hole, and pass that axle 7 to the lower end of creeping into stirring vane 12 passes axle 7 and stack shell 8 enters the soil body, there is a plectane 19 lower end of stack shell 8, its outer rim is greater than stack shell 8 external diameters, the centre coordinates with the outer ring of bearing 14, the inner ring of bearing 14 coordinates with the lower end of axle 7, plectane 19 and stack shell 8 surroundings are with being welded to connect, weld 9 and 13, apex point 15 can rotate along plectane 19 and stack shell, on a square hole is arranged, top side, the lower end tenon of axle 7 inserts this square hole, axle 7 is rotated together with apex point 15, be fixed with two pairs of blade caskets 6 and 11 on stack shell, gear 4 and 10 are arranged on axle 7, respectively with mud jacking stirring vane 5 and the tooth bar engagement of creeping on stirring vane 12, gear 4, gear 10 is connected with axle 7 by key 16.

When bit diameter need to stretch expansion, only need conversion unit head switch, drilling rod and stack shell 8 are turned clockwise by being rotated counterclockwise to change into, as shown in Fig. 2 figure below arrow, the resistance blade 20 of drag effect on apex point 15 due to the soil body, make apex point 15 and the relative stack shell body rightabout rotation of axle 7 of joggle with it, namely be rotated counterclockwise, make also rotation thereupon of gear 4 and 10, make and creep into stirring vane 12 and the mud jacking stirring vane outwards stretches, until hole enlargement caging bolt 18 blocks blade 5, blade 12 stretches.A is the native face of meeting of two groups of blades, otherwise, clockwise turn to when being rotated counterclockwise when drilling rod and stack shell 8 becomes, as shown in figure as upper in Fig. 2, undergauge caging bolt 17 gears are at blade casket 6 and 11 when outer, undergauge reaches predetermined value, at this moment, because gear can not rotate, make that apex point is synchronizeed with stack shell, rotating in same direction, caging bolt is screwed in screw seats different on blade, just can obtain different stake footpath combinations.

Claims

1. expansion bit, formed by stack shell, apex point, stirring vane, it is characterized in that described letter held flange with it, there is plectane the lower end, bearing all is housed in the middle of flange and plectane, two of an axle coordinates with bearing inner race in described plectane and flange respectively, and the side of having, top, the lower end tenon of described axle inserts in the square hole of described apex point.

2. expansion bit according to claim 1, it is characterized in that the fixing a pair of blade casket of described stack shell two each setting-in of difference, two pairs of blade caskets are right-angled intersection and arrange in the space, in described blade casket, stirring vane is arranged, being positioned at upper end blade casket is the mud jacking stirring vane, is to creep into stirring vane in the blade casket of lower end.

3. expansion bit according to claim 1 and 2, it is characterized in that describedly creeping into stirring vane and mud jacking stirring vane one side has tooth bar, respectively with the gear engagement that is connected with described axle with key, the described stirring vane that creeps into has the inclination angle that dips down, and described mud jacking stirring vane has one to vertical angle.

4. expansion bit according to claim 1, is characterized in that described plectane external diameter greater than stack shell, and weld with stack shell.

5. according to claim 1 or 4 described expansion bits, is characterized in that the resistance blade is arranged on described apex point, and resistance Circule inner ring is enclosed within on described plectane, and fixes with bolt and apex point.

6. according to claim 1 and 2 or 3 described expansion bits is characterized in that described arbitrary to the mud jacking stirring vane or creep into and several groups of screws are arranged, the bolt of can screwing on demand on screw on stirring vane.