CN112647840A

CN112647840A - Rotary pneumatic device of large-depth down-the-hole hammer

Info

Publication number: CN112647840A
Application number: CN202110069716.7A
Authority: CN
Inventors: 蒙军; 桂宇; 杨世林; 张益波; 蒙泽宇; 许立明
Original assignee: Guiyang Clouds Geotechnical Engineering Co ltd
Current assignee: Guiyang Clouds Geotechnical Engineering Co ltd
Priority date: 2021-01-19
Filing date: 2021-01-19
Publication date: 2021-04-13
Anticipated expiration: 2041-01-19
Also published as: CN112647840B

Abstract

The invention discloses a rotary pneumatic device of a large-depth down-the-hole hammer, belonging to building construction machinery; aims to provide a rotary power device of a down-the-hole hammer, the drilling depth of which is not limited by the length of a drill rod. The device comprises a rotary joint fixedly connected with a lifting disc and a pneumatic rotary device in butt joint communication with the rotary joint; the hoisting platform consists of an air inlet joint (10) fixed on the connecting plate (8) and a lifting lug (9); the rotary joint consists of an upper joint (1) communicated with an air inlet joint (10), a middle joint (2) fixedly connected with the upper joint and a lower joint (3) in rotary butt joint communication with the middle joint; the pneumatic rotating device consists of a gas distribution hood (4), a middle pipe (5), a gas collection hood (6) and a spiral core body; the spiral core body is composed of a flow guide body (12) and a plurality of spiral blades (13) which are uniformly distributed between the flow guide body and the inner wall of the middle pipe. The invention can realize flexible connection between a drilling machine and a drill rod by adopting a steel rope, and is a rotary power device of a down-the-hole hammer.

Description

Rotary pneumatic device of large-depth down-the-hole hammer

Technical Field

The invention relates to a rotary power device of a down-the-hole hammer, in particular to a pneumatic device for pushing the down-the-hole hammer to rotate; belongs to building construction machinery.

Background

The down-the-hole hammer is a drilling tool for forming a pile hole in the construction process of a building foundation, and is generally formed by connecting an impactor and an impact hammer in a sliding mode through a spline. The working principle of pore-forming is that a power head arranged on a drilling machine drives a down-the-hole hammer to rotate through a drill rod, and compressed air pushes a piston in an impactor to force the impact hammer to do up-and-down reciprocating impact motion so as to realize rock crushing; the broken rock debris is carried to the ground along with the waste gas discharged after the down-the-hole hammer works, so that hole cleaning and slag discharging are realized.

At present, the power head arranged on a drilling machine is generally used for driving the down-the-hole hammer to rotate through a rigid connecting component, and the following defects exist:

1) the drilling depth is limited by the length of the drill rod, and the requirement of deep hole drilling cannot be met;

2) too long a drill rod not only causes large oscillations, which tend to rub against the pile bore wall, but also results in reduced transmission efficiency.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide the rotary pneumatic device of the large-depth down-the-hole hammer, which has a simple structure and the drilling depth is not limited by the length of a drill rod.

In order to achieve the purpose, the invention adopts the following technical scheme: the pneumatic lifting device comprises a rotary joint fixedly connected with a lifting disc and a pneumatic rotating device in butt joint communication with the rotary joint; wherein: the lifting platform consists of an air inlet joint fixed on the connecting plate and two lifting lugs; the rotary joint consists of an upper joint which is fixed on the back of the connecting plate and communicated with the air inlet joint, an intermediate joint which is fixedly butted and communicated with the upper joint, and a lower joint which is rotatably butted and communicated with the lower end of the intermediate joint through a bearing assembly; the pneumatic rotating device consists of a flow guide shell and a spiral core body, wherein the flow guide shell consists of a gas distribution cover, a middle pipe and a gas collecting cover which are fixedly butted and communicated in sequence from top to bottom, and the spiral core body is fixed in the flow guide shell; the spiral core body is composed of a bullet-shaped flow guide body and a plurality of spiral blades which are uniformly distributed between the cylindrical surface of the flow guide body and the inner wall of the middle pipe in a spiral mode.

The bearing assembly consists of a deep groove ball bearing and a thrust roller bearing.

The gas distribution hood is of an inverted funnel-shaped structure, and the gas collection hood is of a funnel-shaped structure.

Sealing gaskets are arranged between the lower joint and the gas distribution cover, between the gas distribution cover and the middle pipe and between the middle pipe and the gas collecting cover.

Compared with the prior art, the invention has the following advantages due to the adoption of the technical scheme:

1) the pneumatic rotary device is adopted to replace a hydraulic power head or a motor power head arranged on the drilling machine, and a rotary joint is added, so that flexible connection can be realized between the drilling machine and the drill rod by adopting a steel rope, and the down-the-hole hammer is driven to rotate by utilizing compressed air. The defect that the drilling depth of the down-the-hole hammer with the traditional structure is limited by the length of a drill rod is thoroughly overcome, and large-depth pile hole forming can be realized.

2) Because the flexible connection is realized between the drilling machine and the drill rod by adopting the steel rope, the length of the drill rod can be greatly shortened, the rigidity of the drill rod is improved, and the drill rod can not swing greatly and can not rub with the hole wall in the rotating process, so the transmission efficiency can not be lost.

3) Because the gas distribution cover adopts an inverted funnel-shaped expanding structure and the flow guide body adopts a bullet-shaped reducing structure with upward taper, the gas inlet amount of compressed air can be increased, and the flow speed of the compressed gas passing through the spiral channel can be accelerated; and the gas collecting channel adopts a funnel-shaped reducing structure, so that the pressure of compressed air flow can be improved, and the tangential thrust of the air flow to the helical blade is increased.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a cross-sectional view B-B of FIG. 1;

fig. 4 is a perspective view of the spiral core of the present invention installed in the intermediate tube.

In the figure: the gas distribution device comprises an upper joint 1, a middle joint 2, a lower joint 3, a gas distribution hood 4, a middle pipe 5, a gas collection hood 6, a drill rod 7, a connecting plate 8, a lifting lug 9, a gas inlet joint 10, a bearing assembly 11, a flow guide body 12 and a helical blade 13.

Detailed Description

The invention is further described with reference to the following figures and specific examples.

As shown in fig. 1-4: the invention is composed of a rotary joint fixedly connected with a hoisting disk and a pneumatic rotary device in butt joint communication with the rotary joint. Wherein: the hoisting platform consists of an air inlet joint 10 fixed on the connecting plate 8 and two lifting lugs 9 for connecting hoisting steel cables (not shown in the figure). The hoisting steel rope can make the drilling machine vertically move up and down under the driving of a winch (not shown in the figure), so that the drilling depth is not limited by the length of a drill rod, and the drilling depth of the equipment is increased. The rotary joint is composed of an upper joint 1, an intermediate joint 2 and a lower joint 3, wherein the upper joint 1 is fixed on the back of a connecting plate 8 through a flange (not shown in the figure) and communicated with an air inlet joint 10, the intermediate joint 2 is communicated with a lower port of the upper joint in a welding mode, and the lower joint is in rotary butt joint communication with the lower end of the intermediate joint through a bearing assembly 11. The pneumatic rotating device is composed of a flow guide shell and a spiral core body, wherein the flow guide shell is composed of an air distribution cover 4, a middle pipe 5 and an air collection cover 6 which are fixedly butted and communicated through a flange plate (not marked in the figure) from top to bottom, and the spiral core body is fixed in the flow guide shell. The spiral core body is composed of a flow guide body 12 in a bullet-shaped structure and a plurality of spiral blades 13 which are uniformly distributed in a spiral mode from top to bottom and welded on the cylindrical surface of the flow guide body, and the spiral core body is welded on the inner wall of the middle pipe 5 through the spiral blades 13. The lower joint 3 is in butt joint communication with the gas distribution cover 4 through another flange (not shown).

In the above embodiment, the bullet-shaped flow guiding body 12 can ensure uniform air flow distribution and increase the flow velocity of the compressed air flow passing through the spiral channel.

In order to ensure that the pneumatic rotating device can simultaneously bear axial and radial impact loads, the bearing assembly 11 is composed of a deep groove ball bearing and a thrust roller bearing.

In order to increase the air input, the air distribution cover 4 adopts an inverted funnel-shaped expanding structure; in order to increase the pressure of the compressed air flow, the air collecting hood 6 adopts a funnel-shaped reducing structure.

When the pneumatic down-the-hole hammer works, a drill rod 7 fixedly connected with a down-the-hole hammer (not shown in the figure) is fixedly connected and communicated with the lower port of the gas collecting hood 6 in a butt joint mode through a flange plate, an air inlet connector 10 is communicated with an air compressor (not shown in the figure) through an external air pipe, the pneumatic down-the-hole hammer is placed into a pile hole (not shown in the figure) through two steel ropes (not shown in the figure) connected between a winch (not shown in the figure) and a lifting lug 9.

The working principle is as follows: compressed air enters the guide shell through an external air pipe (not shown), an air inlet joint 10 and a rotary joint, and under the action of the spiral core, the compressed air can form high-pressure air flow which rotates rapidly after flowing through a plurality of spiral air flow channels which are jointly formed by the intermediate pipe 5, the spiral blades 13 and the guide body 12, so that large tangential thrust can be generated on the spiral blades 13, the pneumatic rotating device and the lower joint 3 can be driven to rotate by the spiral blades 13, and a down-the-hole hammer fixedly connected with the drill rod 7 also rotates along with the pneumatic rotating device and the lower joint, so that drilling is realized.

Claims

1. A rotary pneumatic device of a large-depth down-the-hole hammer is characterized by comprising a rotary joint fixedly connected with a hoisting disc and a pneumatic rotary device in butt joint communication with the rotary joint; wherein:

the hoisting platform consists of an air inlet joint (10) fixed on a connecting plate (8) and two lifting lugs (9);

the rotary joint is composed of an upper joint (1) which is fixed on the back of the connecting plate (8) and communicated with the air inlet joint (10), a middle joint (2) which is fixedly butted and communicated with the upper joint, and a lower joint (3) which is rotatably butted and communicated with the lower end of the middle joint through a bearing assembly (11);

the pneumatic rotating device consists of a diversion shell and a spiral core body, wherein the diversion shell consists of a gas distribution cover (4), a middle pipe (5) and a gas collection cover (6) which are fixedly butted and communicated in sequence from top to bottom, and the spiral core body is fixed in the diversion shell; the spiral core body is composed of a bullet-shaped flow guide body (12) and a plurality of spiral blades (13) which are uniformly distributed between the cylindrical surface of the flow guide body and the inner wall of the middle pipe in a spiral mode.

2. The rotary pneumatic deep down-the-hole hammer of claim 1, wherein: the bearing assembly (11) consists of a deep groove ball bearing and a thrust roller bearing together.

3. The rotary pneumatic deep down-the-hole hammer of claim 1, wherein: the gas distribution hood (4) is of an inverted funnel-shaped structure, and the gas collection hood (6) is of a funnel-shaped structure.

4. A rotary pneumatic device for a deep down-the-hole hammer as claimed in any one of claims 1 to 3, wherein: sealing gaskets are arranged between the lower joint (3) and the gas distribution hood (4), between the gas distribution hood and the middle pipe (5) and between the middle pipe and the gas collecting hood (6).