CN214997460U

CN214997460U - Four-wing rotary digging bottom expanding drill bit

Info

Publication number: CN214997460U
Application number: CN202121786785.1U
Authority: CN
Inventors: 杨明; 王猛; 张�林; 赵周
Original assignee: Shandong Dingxin Geotechnical Technology Co ltd
Current assignee: Shandong Dingxin Geotechnical Technology Co ltd
Priority date: 2021-08-03
Filing date: 2021-08-03
Publication date: 2021-12-03
Anticipated expiration: 2031-08-03

Abstract

The utility model provides a four-wing rotary digging bottom expanding drill bit, which comprises a connecting side, wherein the connecting side is welded at the top of a cylindrical seat, and a supporting body is arranged below the cylindrical seat; the lower end of the periphery of the support body is provided with a plurality of expansion wings in a cross shape; the bottom end of the expansion wing is connected with a lower wing through a rotating shaft; the utility model has the advantages that the lower end of the periphery of the support body is provided with a plurality of expansion wings in a cross shape, and the four expansion wings are arranged on two mutually vertical planes in a cross shape, so that the expansion wings can cut the soil layer with the same section only by rotating 90 degrees, and the reaming efficiency is doubled; moreover, a plurality of cutting teeth are welded outside the expansion wings, and the expansion wings have more advantages in reaming in hard soil layers and weathered rock layers; when encountering a rock layer, the bottom-expanding drill bit has large loss and is frequently maintained, so that the working efficiency is influenced; a plurality of protection blocks are uniformly distributed outside the expanding sleeve, the expanding sleeve can be prevented from being damaged due to collision with rocks through the protection blocks, and the protection effect is improved.

Description

Four-wing rotary digging bottom expanding drill bit

Technical Field

The utility model belongs to the technical field of dig the rig soon, especially, relate to a four wings are dug and are dug reaming end drill bit soon.

Background

The rotary-digging bottom-expanding bored concrete pile can greatly improve the bearing capacity of a single pile and reduce the construction cost, but when the bottom-expanding stratum is a hard soil layer or a weathered rock layer, the bottom expansion needs to be drilled and the bottom expansion needs to be carried out at the same time, the construction efficiency of a commonly used two-wing bottom-expanding drill bit is obviously reduced, the drill bit is damaged and maintained frequently, and the problems of a plurality of technologies and cost exist. The common two-wing under-reamed drill bit generally comprises the following steps: the construction of the straight hole section is firstly completed, the bottom expanding is carried out after the pile length or the bearing stratum specified by design is entered, the bottom expanding operation does not drill along the depth direction any more, but the transverse bottom expanding operation is started at the depth. In the commonly used bottom-expanding drill bit, the expansion wings are in a straight shape on one plane, so that the expansion wings can cut the soil layer with the same section only by rotating 180 degrees, the hole expanding efficiency is relatively low, and when the bottom-expanding drill bit meets a rock layer, the bottom-expanding drill bit has large loss and is frequently maintained, so that the working efficiency is influenced.

The invention provides a four-wing rotary-digging bottom-expanding drill bit, wherein the expanding wings are arranged on two planes which are vertical to each other and are in a cross shape, so that the expanding wings can cut a soil layer with the same section by rotating 90 degrees, and the hole expanding efficiency is doubled. Because the expansion wings are provided with a plurality of groups of alloy cutting teeth, the expansion wing has more advantages in reaming in hard soil layers and weathered rock layers.

Therefore, the invention of the four-wing rotary excavating bottom expanding drill bit is very necessary.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a four wings are dug soon and are expanded end drill bit to solve the end drill bit that expands commonly used, the extension wing is on a plane, for "a" font, so the extension wing need rotate 180 just can cut same section soil layer, and reaming efficiency is lower relatively, when meetting the rock layer, and the end drill bit loss that expands is great, and frequent maintenance influences work efficiency's problem. A four-wing rotary excavating bottom expanding drill bit comprises a connecting square, wherein the connecting square is welded at the top of a cylindrical seat, and a support body is arranged below the cylindrical seat; the lower end of the periphery of the support body is provided with a plurality of expansion wings in a cross shape; the bottom end of the expansion wing is connected with a lower wing through a rotating shaft; a telescopic rod is fixedly arranged below the supporting body; the bottom end of the telescopic rod is fixedly connected with the support bottom; the drill bit is welded at the bottom of the supporting bottom.

The lower end of the lower wing is movably connected with the lower end of the telescopic rod through a rotating shaft.

The outside welding of expansion wing has a plurality of picks.

An expanding sleeve is sleeved outside the cylindrical seat; a plurality of mounting holes are uniformly distributed on the outer part of the expanding sleeve, and internal thread pipes are arranged in the mounting holes; the internal thread pipe is provided with a counter bore bolt in a matching way.

The counter bore bolt penetrates through the internal threaded pipe and then props against the outer surface of the cylindrical seat.

And a plurality of protection blocks are uniformly distributed outside the expanding sleeve.

The upper part of the supporting base is provided with a movable seat which is arranged in a cross shape and is movably connected with the four lower wings through rotating shafts.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. the utility model has the advantages that the lower end of the periphery of the support body is provided with a plurality of expansion wings in a cross shape, and the four expansion wings are arranged on two mutually vertical planes in a cross shape, so that the expansion wings can cut the soil layer with the same section by rotating 90 degrees, and the reaming efficiency is doubled;

2. the utility model has the advantages that the cutting picks are welded outside the extending wings, and the hole expanding is carried out in the hard soil layer and the weathered rock layer; when encountering a rock layer, the bottom-expanding drill bit has large loss and is frequently maintained, so that the working efficiency is influenced;

3. the utility model discloses, the telescopic outside equipartition of hole enlargement has a plurality of protection pieces, can prevent hole enlargement sleeve and rock collision through the protection piece and lead to damaging, has improved the protection effect.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic perspective view of the present invention.

In the figure:

1-connecting square, 2-cylindrical seat, 3-supporting body, 4-expanding wing, 5-lower wing, 6-supporting bottom, 7-telescopic rod, 8-cutting tooth, 9-expanding sleeve, 10-internal threaded pipe, 12-counter bore bolt and 14-protective block.

Detailed Description

The invention is further described below with reference to the accompanying drawings:

example (b):

as shown in figures 1-2

The utility model provides a four-wing rotary digging bottom expanding drill bit, which comprises a connecting square 1, wherein the connecting square 1 is welded at the top of a cylindrical seat 2, and a support body 3 is arranged below the cylindrical seat 2; the lower end of the periphery of the support body 3 is provided with a plurality of expansion wings 4 in a cross shape; the bottom end of the extension wing 4 is connected with a lower wing 5 through a rotating shaft; a telescopic rod 7 is fixedly arranged below the supporting body 3; the bottom end of the telescopic rod 7 is fixedly connected with the supporting bottom 6; the bottom of the supporting bottom 6 is welded with a drill bit.

The lower end of the lower wing 5 is movably connected with the lower end of the telescopic rod 7 through a rotating shaft.

A plurality of cutting teeth 8 are welded on the outer part of the expansion wing 4.

An expanding sleeve 9 is sleeved outside the cylindrical seat 2; a plurality of mounting holes are uniformly distributed on the outer part of the expanding sleeve 9, and internal thread pipes 10 are arranged in the mounting holes; the internal threaded pipe 10 is provided with a counter bore bolt 12 in a matching way.

The counter bore bolt 12 passes through the internal thread pipe 10 and then is pressed against the outer surface of the cylindrical seat 2.

A plurality of protection blocks 14 are uniformly distributed outside the expanding sleeve 9.

Principle of operation

The utility model discloses, during the use, at first carry out fixed connection with the machine of digging soon with the side of connection 1, telescopic link 7 drives the support end 6 and upwards contracts, extension wing 4 and lower wing 5 expand, when the machine of digging soon drives the side of connection 1 rotatory, install the drill bit in the bottom of support end 6 at first with ground contact, and begin to bore a hole, because the lower extreme around the supporter 3 is the cross and is provided with a plurality of extension wings 4, four extension wings 4 are on two planes of mutually perpendicular, for "ten" font, so the extension wing only needs to rotate 90 and can cut same section soil layer, reaming efficiency improves one time, and the outside welding of extension wing 4 has a plurality of picks 8, ream in hard soil layer, stratum, more morals and manners; when encountering a rock layer, the bottom-expanding drill bit has large loss and is frequently maintained, so that the working efficiency is influenced;

the protection blocks 14 are uniformly distributed on the outer portion of the expanding sleeve 9, the expanding sleeve 9 can be prevented from being damaged due to collision with rocks through the protection blocks 14, and the protection effect is improved.

Utilize technical scheme, or technical personnel in the field are in the utility model discloses under technical scheme's the inspiration, design similar technical scheme, and reach above-mentioned technological effect, all fall into the utility model discloses a protection scope.

Claims

1. The utility model provides a four wings are dug soon and are expanded end drill bit which characterized in that: the connecting square (1) is welded on the top of the cylindrical seat (2), and a support body (3) is arranged below the cylindrical seat (2); the lower end of the periphery of the support body (3) is provided with a plurality of extending wings (4) in a cross shape; the bottom end of the expansion wing (4) is connected with a lower wing (5) through a rotating shaft; a telescopic rod (7) is fixedly arranged below the supporting body (3); the bottom end of the telescopic rod (7) is fixedly connected with the supporting bottom (6); the drill bit is welded at the bottom of the supporting bottom (6).

2. The four-wing rotary excavating bottom expanding drill bit according to claim 1, characterized in that: the lower end of the lower wing (5) is movably connected with the lower end of the telescopic rod (7) through a rotating shaft.

3. The four-wing rotary excavating bottom expanding drill bit according to claim 2, characterized in that: the external part of the expansion wing (4) is welded with a plurality of cutting teeth (8).

4. The four-wing rotary excavating bottom expanding drill bit according to claim 1, characterized in that: an expanding sleeve (9) is sleeved outside the cylindrical seat (2); a plurality of mounting holes are uniformly distributed on the outer part of the expanding sleeve (9), and an internal thread pipe (10) is arranged in each mounting hole; the internal thread pipe (10) is provided with a counter bore bolt (12) in a matching way.

5. The four-wing rotary excavating bottom expanding drill bit according to claim 4, characterized in that: the counter bore bolt (12) penetrates through the internal thread pipe (10) and then props against the outer surface of the cylindrical seat (2).

6. The four-wing rotary excavating bottom expanding drill bit according to claim 5, characterized in that: a plurality of protection blocks (14) are uniformly distributed outside the expanding sleeve (9).