CN103256072A - Anti-spray device for assisting high-pressure water jet slotting - Google Patents

Abstract

An auxiliary high-pressure water jet slit blowout prevention device, including a collecting assembly (1) and a locking assembly (2), which are connected by threads; The outer surface of the inner sleeve ⑾ is in smooth contact with the inner surface of the outer sleeve ⑼, the nut ⑽ is arranged on the inner sleeve ⑾, and is located between the outer sleeve ⑼ and the gathering assembly ⑴; the outer sleeve ⑼ The upper part is drum-shaped, and the drum-shaped wall ⒁ is axially equipped with multiple ring-shaped convex teeth ⒂, and the drum-shaped wall ⒁ is uniformly distributed with multiple rectangular grooves ⒀ in the radial direction; the lower opening of the outer sleeve ⑼ is trumpet-shaped, and the horn A plurality of rectangular openings ⒃ are evenly distributed radially on the wall of the shaped cylinder to form a bracket ⒄. Its advantages are: the present invention can effectively reduce the occurrence rate of the injection hole phenomenon, thereby avoiding the huge threat to the life safety of coal miners caused by gas exceeding the limit, and eliminating a major safety hazard in coal mining; Widely used high-pressure water jet slits are of great significance to prevent spray holes.

Description

An auxiliary high-pressure water jet slit blowout prevention device

technical field

The invention relates to the technical field of coal mining, in particular to an auxiliary high-pressure water jet slit blowout prevention device.

Background technique

With the increase of energy demand and the continuous increase of mining intensity, shallow resources are decreasing day by day, and the depth of coal mining in my country is increasing. At present, most coal mines have entered into deep mining. As the mining depth increases, the gas pressure and gas content are getting higher and higher. At the same time, the air permeability is worse, so mining is more difficult and dangerous. In order to prevent gas accidents and ensure mining safety, my country implements the method of "pumping first and then mining" in coal mining, that is, before mining the protective seam coal seam, it is necessary to relieve the pressure of the outburst coal seam at the shallow drilling site or medium-deep drilling site at the top of the coal seam roadway. Perform layer-by-layer extraction. It is an effective and rapid pressure relief method to form grid veins in coal seams and gas drainage by using high-pressure water jet slots, and it is widely used in coal mining. When the high-pressure water jet cuts seams in the coal seam, when the high-pressure gas and slag in the coal seam gushes out in large quantities along the drill holes, the nozzle hole phenomenon will be formed; and the limited air volume of the local ventilation is difficult to prevent the gas from being ejected in large quantities. It is effectively diluted, resulting in frequent gas overruns in the drilling site area, which not only affects the progress of coal mining, but also poses a serious threat to the safety of construction personnel.

Therefore, need a kind of device of auxiliary high-pressure water jet kerf, to prevent the generation of spray hole phenomenon. The invention patent with the application number ZL201210546985.9 discloses a safety protection device and method for water jet slit anti-reflection, but it does not explain the specific structure of the drill holder, and the sealing ring connected by the telescopic tube cannot Seal the irregular orifice at the top of the roadway, and a large amount of gas and water slag gushed out from the drill hole when spraying the hole will produce a great impact, and it is easy to wash away the protective device. Therefore, there is a big problem in practical application. At present, there is no device for effective protection against the blowhole phenomenon produced by high-pressure water jet slits in coal seams.

Contents of the invention

The invention aims to solve the problem of nozzle holes that may be generated when high-pressure water jets cut seams in coal seams, thereby providing an auxiliary high-pressure water jet cutting blowout prevention device. The present invention can securely fix the brittle borehole on the inner wall through the locking assembly, and seal the gap between the inner wall of the borehole and the outer wall of the outer sleeve under the action of the sealing rubber ring, so that the gas generated by the slotting and water slag can be effectively collected to prevent the occurrence of nozzle holes, thereby avoiding the huge threat to the life safety of coal miners caused by gas exceeding the limit, and eliminating a major safety hazard in coal mining.

An auxiliary high-pressure water jet slit blowout prevention device, including a gathering assembly 1 and a locking assembly 2, and the gathering assembly 1 and the locking assembly 2 are connected by threads; the locking assembly 2 includes an outer sleeve 9, A nut 10 and an inner sleeve 11, the outer surface of the inner sleeve 11 is in smooth contact with the inner surface of the outer sleeve 9, the nut 10 is arranged on the inner sleeve 11, and is located between the outer sleeve 9 and the collecting assembly 1 Between; the upper part of the outer sleeve 9 is drum-shaped, and the drum-shaped wall 14 is axially equipped with multiple rings of annular convex teeth 15, and the drum-shaped wall 14 is radially evenly distributed with a plurality of rectangular grooves 13; the outer sleeve The lower opening of the cylinder 9 is trumpet-shaped, and a plurality of rectangular openings 16 are evenly distributed radially on the wall of the trumpet-shaped cylinder to form a bracket 17 .

The top outlet of the collection assembly 1 is provided with a sealing ring 4 with a screw 5, and the side of the collection assembly 1 is provided with an outlet 6 for gas and water slag. The bottom is open and the inner side is provided with a female thread 8 .

The upper end of the outer wall of the inner sleeve 11 is provided with a male thread 18 for matching with the female thread 8 , and the lower opening of the inner sleeve 11 is trumpet-shaped.

There are 6-10 rectangular grooves 13, which are used to make the drum wall 14 bend upward when the nut is tightened.

There are 4-8 rectangular openings 16, which are used to make the bracket 17 open and be stuck in the drilled hole when the nut is tightened.

A rubber ring 12 is also provided between the nut 10 and the outer sleeve 9 .

The advantage of an auxiliary high-pressure water jet slit blowout prevention device of the present invention is that when using high-pressure water jet slits to increase the permeability of gas extraction in the coal seam, the device can effectively collect the gas and water slag sprayed out from the borehole, And when a large amount of gas and water slag gushes out, it can withstand a large impact force under the action of the locking component, which effectively prevents the occurrence of the nozzle hole phenomenon, thereby avoiding the life threat to the coal miners brought by the gas outburst, and eliminating A major safety hazard in coal mining.

Description of drawings

Fig. 1 is a schematic diagram of the external structure of an auxiliary high-pressure water jet slit blowout preventer of the present invention;

Fig. 2 is a cross-sectional view of an auxiliary high-pressure water jet slit blowout preventer of the present invention;

Fig. 3 is a structural schematic diagram of each component of an auxiliary high-pressure water jet slit blowout prevention device of the present invention;

In the figure: 1 is the collecting component, 2 is the locking component, 3 is the drill pipe, 4 is the sealing ring, 5 is the screw, 6 is the gas water slag outlet, 7 is the atomizing nozzle, 8 is the female thread, and 9 is the external Sleeve, 10 is a nut, 11 is an inner sleeve, 12 is a rubber ring, 13 is a rectangular groove, 14 is a drum-shaped cylinder wall, 15 is an annular convex tooth, 16 is a rectangular opening, 17 is a bracket, and 18 is a male thread .

Detailed ways

Embodiment one

The present invention will be further described below in conjunction with the accompanying drawings: As shown in Figures 1-3, an auxiliary high-pressure water jet slit blowout preventer includes a gathering assembly 1 and a locking assembly 2, and the gathering assembly 1 and the locking assembly 2 are connected by threads; the locking assembly 2 includes an outer sleeve 9, a nut 10 and an inner sleeve 11, the outer surface of the inner sleeve 11 is in smooth contact with the inner surface of the outer sleeve 9, and the nut 10 It is arranged on the inner sleeve 11 and is located between the outer sleeve 9 and the collection assembly 1 .

The top outlet of the collecting assembly 1 is provided with a sealing ring 4 with a screw 5, and the inner diameter of the sealing ring 4 is slightly larger than the outer diameter of the drill pipe used for drilling; The axis of 6 forms an acute angle with the axis of the main body of the collecting assembly 1; three atomizing nozzles 7 are evenly distributed radially on the outer wall of the collecting assembly 1, and the bottom of the collecting assembly 1 is open and a female thread 8 is provided on the inside.

The upper end of the outer wall of the inner sleeve 11 is provided with a male thread 18 for matching with the female thread 8 , and the lower opening of the inner sleeve 11 is trumpet-shaped.

The upper part of the outer sleeve 9 is drum-shaped, and the drum-shaped wall 14 is axially equipped with multiple rings of annular convex teeth 15, and the drum-shaped wall is radially evenly distributed with 8 rectangular grooves 13, which are used for tightening the nut. The drum-shaped wall 14 bends upwards; the lower opening of the outer sleeve 9 is trumpet-shaped, and the horn-shaped wall is radially evenly distributed with 6 rectangular openings to form a bracket 17, which is used to make the bracket 17 open and be stuck in when the nut is tightened. inside the drilled hole. A rubber ring 12 is also provided on the top of the outer sleeve 9, and the outer diameter of the rubber ring 12 is slightly larger than the diameter of the drilled hole.

The bell mouth at the bottom of the inner sleeve 11 matches the bell mouth at the bottom of the outer sleeve 9, so that when the inner sleeve 11 moves upward relative to the outer sleeve 9, the bracket 17 at the bottom of the outer sleeve 9 can be expanded.

The inner sleeve 11 is made of a harder and lighter material, such as Q235, and its inner and outer surfaces are cast; the outer sleeve 9 is made of a material with better toughness and hardness, such as aluminum alloy, and its inner and outer surfaces are cast.

Embodiment two

There are 6 rectangular grooves 13, which are used to make the drum-shaped cylinder wall 14 bend upward when the nut is tightened.

There are 8 rectangular openings 16, which are used to make the bracket 17 open and be stuck in the drilled hole when the nut is tightened.

All the other technical features are the same as those in Embodiment 1.

Embodiment three

There are 10 rectangular grooves 13, which are used to make the drum wall 14 bend upward when the nut is tightened.

There are four rectangular openings 16, which are used to make the bracket 17 open and be stuck in the drilled hole when the nut is tightened.

All the other technical features are the same as those in Embodiment 1.

The present invention is achieved like this:

1. Insert the inner sleeve 11 from the bottom of the outer sleeve 9. Due to the horn-shaped opening at the lower part of the inner sleeve 11, the inner sleeve 11 can no longer move up relative to the outer sleeve 9 without applying a large force. ;

2. Install the nut 10 on the male thread 18 on the upper end of the inner sleeve 11;

3. Insert the assembled part into the drill hole and put it on the drill pipe 3, rotate the nut 10 and press the outer sleeve 9, because the inner sleeve 11 moves up relative to the outer sleeve 9, the drum shape of the upper part of the outer sleeve The cylinder wall 14 is still bent, and the bracket 17 at the lower trumpet-shaped opening begins to expand outwards, and is in close contact with the hole wall, and due to the effect of the ring-shaped protruding teeth 15 on the drum-shaped cylinder wall 14, the present invention can be clamped in the borehole place;

4. Connect the collecting assembly 1 with the male thread 18 on the inner sleeve through the female thread 8;

5. Connect the gas-water slag outlet 6 on the collecting assembly 1 to the gas-water slag separation box in the roadway. If the air exhaust drilling is used, the atomizing nozzle 7 on the collecting assembly 1 is connected to the water pipe, and the dust is settled by spraying water mist to the cavity of the collecting assembly 1 .

The invention assists the high-pressure water jet to cut seams in the coal seam to carry out gas extraction, which can effectively prevent the phenomenon of spray holes from occurring. The present invention was tested in the project of gas control in the middle bottom roadway area of the large mining and long mining face under the compound dynamic disaster, which is located in Pingdingshan. After comparison, before the present invention was used, the incidence rate of the gas injection phenomenon in the drilling process It is 60%-80%. After using the present invention, the occurrence rate of the nozzle hole phenomenon is reduced to 12-25%, and the drop rate reaches 70%-80%. Because the blowhole phenomenon is related to geological conditions, the deep buried places in the southwest region have poor air permeability, high gas pressure, and the probability of blowholes is high, while the shallow buried places in the north have a low probability, so the decline rate will vary with different regions and hole depths .

Claims (6)

1. An auxiliary high-pressure water jet slit blowout prevention device, including a gathering assembly (1) and a locking assembly (2), the gathering assembly (1) and the locking assembly (2) are connected by threads; the locking assembly (2) includes an outer sleeve ⑼, nut ⑽ and inner sleeve ⑾, the outer surface of the inner sleeve ⑾ is in smooth contact with the inner surface of the outer sleeve ⑼, the nut ⑽ is set on the inner sleeve ⑾, located on the outer sleeve ⑼ and the gathering assembly ⑴ between; it is characterized in that: the upper part of the outer sleeve ⑼ is drum-shaped, and the drum-shaped wall ⒁ is axially equipped with multiple ring-shaped convex teeth ⒂, and the drum-shaped wall ⒁ is radially evenly distributed with multiple rectangular grooves ⒀; the lower opening of the outer sleeve ⑼ is trumpet-shaped, and a plurality of rectangular openings ⒃ are evenly distributed radially on the wall of the trumpet-shaped tube to form a bracket ⒄. 2. An auxiliary high-pressure water jet slit blowout preventer as claimed in claim 1, characterized in that: the top outlet of the collecting assembly (1) is provided with a sealing ring (4) with screws (5), and the collecting assembly (1) is provided with an air Water slag outlet ⑹, collecting component ⑴ with multiple atomizing nozzles evenly distributed radially on the outer wall ⑺, collecting component ⑴ with an opening at the bottom and a female thread ⑻ on the inside. 3. An auxiliary high-pressure water jet slotted blowout prevention device according to claim 1, characterized in that: the upper end of the outer wall of the inner sleeve ⑾ is provided with a male thread ⒅ for matching with the female thread ⑻, and the inner sleeve ⑾ ⑾ The lower opening is trumpet-shaped. 4. An auxiliary high-pressure water jet slit blowout prevention device according to claim 1, characterized in that: there are 6-10 rectangular grooves ⒀. 5. An auxiliary high-pressure water jet slit blowout prevention device according to claim 1, characterized in that: there are 4-8 rectangular openings ⒃. 6. An auxiliary high-pressure water jet slotting blowout prevention device according to claim 1, characterized in that: a rubber ring ⑿ is also provided between the nut ⑽ and the outer sleeve ⑼.

Images