CN214196171U

CN214196171U - Rotary pneumatic device of down-the-hole hammer

Info

Publication number: CN214196171U
Application number: CN202120138332.1U
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: 2021-09-14
Anticipated expiration: 2031-01-19

Abstract

The utility model discloses a rotary pneumatic device of a down-the-hole hammer, belonging to the 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 pneumatic rotary device comprises a pneumatic rotary device which is in butt joint communication with a rotary joint; the rotary joint consists of an upper joint (1), a middle joint (2) in butt joint communication with the upper joint and a lower joint (3) in rotary butt joint communication with the lower end of the middle joint through a bearing assembly (10); 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 connected in a butt joint mode in sequence, and the spiral core body is fixed in the diversion shell; the spiral core body is composed of a bullet-shaped flow guide body (8) and a plurality of spiral blades (9) uniformly distributed between the cylindrical surface of the flow guide body and the inner wall of the middle pipe. The utility model discloses can adopt the steel cable to realize the flexible coupling between rig and drilling rod, be a down-the-hole hammer gyration power device.

Description

Rotary pneumatic device of down-the-hole hammer

Technical Field

The utility model relates to a down-the-hole hammer rotation power device, in particular to a pneumatic device for pushing a 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 slidably connecting an impactor and an impact hammer through splines. 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

The above-mentioned defect to prior art existence, the utility model aims at providing a simple structure, the drilling depth do not receive the rotatory pneumatic means of down-the-hole hammer of drilling rod length restriction.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the pneumatic rotary device comprises a pneumatic rotary device which is in butt joint communication with a rotary joint; the rotary joint consists of an upper joint, a middle joint fixedly butted and communicated with the upper joint and a lower joint rotatably butted and communicated with the lower end of the middle 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 on 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 utility model discloses owing to adopted above-mentioned technical scheme, consequently at least, have following advantage:

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 diagram 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 schematic perspective view of the spiral core of the present invention installed in the intermediate pipe.

In the figure: the gas distribution device comprises an upper joint 1, a middle joint 2, a lower joint 3, a gas distribution cover 4, a middle pipe 5, a gas collection cover 6, a drill rod 7, a flow guide body 8, a helical blade 9 and a bearing assembly 10.

Detailed Description

The invention will be further described with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1-4: the utility model discloses constitute by rotary joint, pneumatic rotary device. The rotary joint is composed of an upper joint 1, an intermediate joint 2 welded and communicated with a lower port of the upper joint, and a lower joint 3 in rotary butt joint communication with the lower end of the intermediate joint through a bearing assembly 10. 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 8 in a bullet-shaped structure and a plurality of spiral blades 9 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 9.

The lower joint 3 is in butt joint communication with the gas distribution cover 4 through an additional flange plate (not shown).

In the above embodiment, the bullet-shaped flow guiding body 8 can ensure uniform air flow distribution and increase the flow rate of the compressed air flow passing through the spiral channel.

In order to ensure that the pneumatic rotary device can simultaneously bear axial and radial impact loads, the bearing assembly 10 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.

During operation, the drilling rod 7 that will link firmly with down-the-hole hammer (not shown in the figure) passes through the fixed butt joint intercommunication of port under flange and the gas collecting channel 6, utilizes external trachea with top connection 1 and air compressor machine (not shown in the figure) intercommunication, utilizes two steel cables of being connected with hoist engine (not shown in the figure) will the utility model discloses transfer to in the stake hole, then start the air compressor machine can.

The working principle is as follows: compressed air enters the diversion shell through an external air pipe (not shown in the figure) and a rotary joint, and under the action of the spiral core, the compressed air can form high-pressure airflow which rotates rapidly after flowing through a plurality of spiral airflow channels which are jointly formed by the middle pipe 5, the spiral blades 9 and the diversion body 8, so that larger tangential thrust can be generated on the spiral blades 9, the pneumatic rotating device and the lower joint 3 can be driven to rotate by the spiral blades 9, and then 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 down-the-hole hammer is characterized in that: comprises a pneumatic rotating device which is in butt joint communication with a rotating joint; the rotary joint consists of an upper joint (1), a middle joint (2) fixedly butted and communicated with the upper joint and a lower joint (3) rotatably butted and communicated with the lower end of the middle joint through a bearing assembly (10); 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 (8) and a plurality of spiral blades (9) 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. A down-the-hole hammer rotary pneumatic device as set forth in claim 1, wherein: the bearing assembly (10) consists of a deep groove ball bearing and a thrust roller bearing together.

3. A down-the-hole hammer rotary pneumatic device as set forth in 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 down-the-hole hammer rotary pneumatic device 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).