CN219528933U

CN219528933U - Double-pipe rotary jet drill bit capable of preventing slurry from returning

Info

Publication number: CN219528933U
Application number: CN202320819531.8U
Authority: CN
Inventors: 张艺伟
Original assignee: Tianjin Baorui Nord Engineering Technology Co ltd
Current assignee: Tianjin Baorui Nord Engineering Technology Co ltd
Priority date: 2023-04-13
Filing date: 2023-04-13
Publication date: 2023-08-15
Anticipated expiration: 2033-04-13

Abstract

The utility model provides a double-pipe rotary jet drill bit capable of preventing back slurry, which is characterized by comprising a drill rod, a drill bit, a connecting block, a spring and a baffle plate, wherein the drill rod is connected with the drill bit; through setting up connecting block, spring and baffle in air flue gas outlet department, when high-pressure gas passes through the air flue, along with the pressure of gas and the elastic action of spring self, gas can be with the baffle ejecting downwards, the baffle that moves down this moment forms the passageway of giving vent to anger with air flue gas outlet department, high-pressure gas is led to the hybrid chamber along the passageway of giving vent to anger, when stopping to let in high-pressure gas, spring resumes elastic deformation, the baffle is driven to move up to and goes out the laminating with the air flue gas outlet this moment, can seal the air flue this moment, prevent in the thick liquids backward flow intake duct, cause the jam to the air flue, influence work efficiency.

Description

Double-pipe rotary jet drill bit capable of preventing slurry from returning

Technical Field

The utility model relates to the technical field of rotary spraying equipment, in particular to a double-pipe rotary spraying drill bit capable of preventing back slurry.

Background

The high pressure jet grouting pile is to spray cement slurry into soil layer with high pressure rotating nozzle to mix with soil to form continuously lapped cement reinforcing body. At present, the working mode of the high-pressure jet grouting pile is that a nozzle is screwed into a soil layer, the nozzle is screwed out upwards after reaching a proper position, cement slurry is sprayed into the soil layer to form a cement reinforcing body, the drill rod is not ventilated in the lifting process of the drill rod, the slurry pressure in the hole is large, the cement slurry flows back upwards along an air passage, and the slurry can block the air passage.

Accordingly, patent No. CN210858590U provides a dual pipe rotary jetting tool for preventing back slurry, comprising: the center of the double drill rod is provided with a central pipeline, and the position, which is positioned outside the central pipeline, in the double drill rod is provided with an air passage; the drill bit is sleeved and fixed on the outer side of the double drill rod, an accommodating space is reserved between the drill bit and the outer wall of the tail end of the double drill rod, a nozzle groove is further formed in the position, opposite to the tail end of the double drill rod, of the drill bit, and the nozzle groove is communicated with the accommodating space; the check valve is embedded in the accommodating space, gaps are reserved between the check valve and the double drill rods and between the check valve and the drill bit, and the check valve can move to block the air passage; the nozzle is fixedly arranged in the nozzle groove, the center and the side ends of the nozzle are respectively provided with a guniting opening and a jet opening, the guniting opening is communicated with the central pipeline, and the jet opening is communicated with the air passage and the gap. The double-tube rotary jet drill bit for preventing back slurry provided by the utility model effectively solves the problem that slurry continues to flow back due to the fact that a drill rod is not ventilated.

However, the technique of this patent also has the following drawbacks: in the above-mentioned patent technology, the check valve is arranged in the middle of the air passage, the air outlet of the air passage is arranged without any structure, when ventilation is stopped, the check valve starts to work, but the bottom of the air passage and the air outlet are still blocked due to the action of pressure difference, and part of slurry enters the air passage.

Disclosure of Invention

According to the technical problems, the utility model provides a double-pipe rotary jet drill bit capable of preventing blocking and preventing back sizing.

The utility model provides a double-pipe rotary jet drill bit capable of preventing back slurry, which is characterized by comprising a drill rod, a drill bit, a connecting block, a spring and a baffle plate, wherein the drill rod is connected with the drill bit, air passages are respectively arranged at the left side and the right side of the interior of the drill rod, a slurry passage is arranged at the middle side of the interior of the drill rod, the connecting block is connected at the left side and the right side of the air outlet of the air passage, the connecting block is connected with the spring, and the spring is connected with the baffle plate.

The air outlet of the air passage is communicated with the pulp outlet of the pulp passage, a mixing cavity is arranged in the mixing cavity and is connected with a flow guide piece, and a nozzle is arranged on one side of the mixing cavity.

And a pulp outlet channel is respectively arranged at the left side and the right side of the lower side of the pulp channel.

The side of the flow guiding piece, which is close to the air outlet of the air passage, is a straight wall, and the side of the flow guiding piece, which is close to the pulp outlet passage, is an inclined wall.

The beneficial effects of the utility model are as follows: the utility model relates to a double-pipe rotary jet drill bit for preventing back-grouting, which is characterized in that a connecting block, a spring and a baffle are arranged at an air outlet of an air passage, when high-pressure air passes through the air passage, the baffle is ejected downwards along with the pressure of the air and the elastic action of the spring, an air outlet channel is formed between the baffle which moves downwards at the moment and the air outlet of the air passage, the high-pressure air is led into a mixing cavity along the air outlet channel, when the high-pressure air stops being led in, the spring recovers elastic deformation, the baffle is driven to move upwards to be attached to the air outlet of the air passage, the air passage can be sealed at the moment, the slurry is prevented from flowing back into the air passage, the air passage is blocked, and the working efficiency is affected; in addition, set up the water conservancy diversion piece in the hybrid chamber, wherein water conservancy diversion piece one side is the straight wall, and one side is the inclined wall, when high pressure gas lets out, can direct the downwardly flowing along the straight wall of water conservancy diversion piece, when the thick liquid in the play thick liquid passageway flows, can direct the downwardly moving along the inclined wall of water conservancy diversion piece, the water conservancy diversion piece can play the effect of separation this moment, prevent that thick liquid from causing the impact damage in twinkling of an eye to the baffle, according to the structure of water conservancy diversion piece, make the air flue gas outlet lower part and the straight wall side of water conservancy diversion piece form a high-pressure air cavity, make thick liquid unable direct contact air flue gas outlet, when stopping ventilation, thick liquid also unable be inhaled in the air flue in twinkling of an eye, prevent the backward flow of thick liquid.

Drawings

FIG. 1 is a schematic cross-sectional view of the present utility model;

FIG. 2 is an enlarged schematic view of FIG. 1A;

FIG. 3 is an enlarged schematic view of B in FIG. 2;

FIG. 4 is a schematic diagram of the flow of gas and slurry during operation of the present utility model.

Reference numerals: 1-a drill rod; 2-a drill bit; 3-airway; 4-slurry channel; 5-a mixing chamber; 6-a flow guiding piece; 7-nozzle; 8-connecting blocks; 9-a spring; 10-baffle plates; 41-pulp outlet channel.

Detailed Description

Example 1

The technical scheme of the present utility model will be clearly and completely described in the following with reference to the accompanying drawings.

As shown in fig. 1, the utility model provides a double-pipe rotary jet drill bit capable of preventing back slurry, which is characterized by comprising a drill rod 1, a drill bit 2, a connecting block 8, a spring 9 and a baffle 10, wherein the drill rod 1 is connected with the drill bit 2, air passages 3 are respectively arranged at the left side and the right side of the inside of the drill rod 1, a slurry passage 4 is arranged at the middle side of the inside of the drill rod 1, the connecting block 8 is connected at the left side and the right side of the air outlet of the air passage 3, the connecting block 8 is connected with the spring 9, and the spring 9 is connected with the baffle 10.

As shown in fig. 2, a mixing cavity 5 is arranged at the position of the air outlet of the air channel 3 and the pulp outlet of the pulp channel 4 in a communicated manner, a flow guiding piece 6 is connected inside the mixing cavity 5, and a nozzle 7 is arranged at one side of the mixing cavity 5.

The left and right sides of the lower side of the slurry channel 4 are respectively provided with a slurry outlet channel 41.

Example 2

When compressed air is introduced into the air outlet of the air channel 3, the baffle 10 is ejected downwards by the air along with the pressure of the air and the elastic action of the spring 9, an air outlet channel is formed between the downward baffle 10 and the air outlet of the air channel 3, and high-pressure air is introduced into the mixing cavity along the air outlet channel;

simultaneously, the slurry is introduced into the slurry channel 4 and flows out into the mixing cavity 5 along the slurry outlet channels at the two sides;

because the mixing chamber 5 is internally provided with the guide member 6, wherein one side of the guide member 6 is a straight wall, and the other side of the guide member 6 is an inclined wall, when high-pressure gas is discharged from the air passage 3, the high-pressure gas can flow downwards along the straight wall of the guide member 6, at the moment, a high-pressure gas cavity is formed between the side of the straight wall of the guide member 6 and the air outlet of the air passage 3, when slurry in the slurry outlet passage 41 flows out, the slurry can move downwards along the inclined wall of the guide member 6, at the moment, the slurry cannot enter the high-pressure gas cavity, and the slurry and the high-pressure gas are sprayed out from the nozzle together under the action of pressure, as shown in fig. 4.

When the air flue 3 stops supplying the slurry to the slurry channel 4, the spring 9 loses the acting force of the gas to the air flue 4 and recovers the elastic deformation, at the moment, the spring 9 retracts to drive the baffle 10 to move upwards to block the air outlet of the air flue 3, the backflow of the slurry is prevented, the slurry cannot directly contact the air outlet of the air flue 3 due to the existence of the high-pressure air cavity, and at the moment, the gas-stopping slurry cannot flow back into the air inlet channel 3 at the first time.

In addition, the spring 9 can be selected according to the pressure of the gas.

The foregoing has shown and described the basic principles and main features of the present utility model and the advantages of the present utility model. Various components mentioned in the present utility model are common in the art, and it should be understood by those skilled in the art that the present utility model is not limited by the above embodiments, and the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications can be made in the present utility model without departing from the spirit and scope of the utility model, which is defined in the claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a prevent double-barrelled drill bit that spouts soon of back pulp, its characterized in that includes drilling rod, drill bit, connecting block, spring and baffle, drilling rod and drill bit are connected, the inside left and right sides of drilling rod sets up the air flue respectively, the inside mid-side of drilling rod sets up the thick liquid way, the inside left and right sides of air flue gas outlet department connects the connecting block, connecting block and spring coupling, spring and baffle are connected.

2. The double-pipe rotary jetting drill bit for preventing back slurry according to claim 1, wherein a mixing cavity is arranged at the position of the gas outlet of the gas channel and the slurry outlet of the slurry channel in a communicated manner, a flow guiding piece is connected inside the mixing cavity, and a nozzle is arranged on one side of the mixing cavity.

3. The dual pipe rotary jetting drill bit for preventing back slurry according to claim 1, wherein the lower side of the slurry channel is provided with a slurry outlet channel at left and right sides.

4. The dual-tube rotary jetting drill bit for preventing back-slurry according to claim 2, wherein a side of the guide member close to the air outlet of the air passage is a straight wall, and a side of the guide member close to the slurry outlet passage is an inclined wall.