CN113431617A

CN113431617A - Underground exhaust pipeline system for mine

Info

Publication number: CN113431617A
Application number: CN202110978114.3A
Authority: CN
Inventors: 付修远
Original assignee: Jiangsu Changhua Electromechanical Equipment Manufacturing Co ltd
Current assignee: Jiangsu Changhua Electromechanical Equipment Manufacturing Co ltd
Priority date: 2021-08-25
Filing date: 2021-08-25
Publication date: 2021-09-24
Anticipated expiration: 2041-08-25
Also published as: CN113431617B

Abstract

The invention discloses a mine underground exhaust pipeline system, which comprises a straight pipe assembly, a pipeline assembly and a pipeline assembly, wherein the straight pipe assembly comprises an exhaust straight pipe and a first flange arranged at one end of the exhaust straight pipe; the bent pipe assembly comprises a guide bent pipe and a second flange arranged at the end part of the guide bent pipe; the first flange is connected with the second flange, a first circular groove is formed in one surface, in contact with the second flange, of the first flange, a second circular groove is correspondingly formed in one surface, in contact with the first flange, of the second flange, and bearings are arranged in the first circular groove and the second circular groove; when the underground mine turns, the angle of the guide elbow can be manufactured according to the required angle, and when the vertical mine stretches into the branch channel with multiple orientations of the underground branch, the orientation of the guide elbow can be conveniently adjusted to install the pipeline.

Description

Underground exhaust pipeline system for mine

Technical Field

The invention relates to the field of fire safety, in particular to an underground exhaust pipeline system for a mine.

Background

Mining is one of the ancient fields in which humans engaged in production labor. During the mining action, the staff can constantly produce poisonous and harmful gas in the production in pit, for example: carbon monoxide, carbon dioxide, nitrogen dioxide, sulfur dioxide, hydrogen sulfide, methane, etc., and workers cannot survive without being excluded. Therefore, the coal mine ventilation device is required to discharge waste gas generated in the production process of the mine.

In the underground coal mine, some ventilation devices are very important and play a crucial role in normal work of workers in the underground coal mine, but some underground ventilation devices are difficult to effectively guarantee the underground ventilation effect at present, and are difficult to ensure the stable and normal working state of a ventilation pipeline in the underground coal mine, so that the installation is inconvenient, and the angle adjustment is inconvenient.

Disclosure of Invention

This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments, and in this section as well as in the abstract and the title of the invention of this application some simplifications or omissions may be made to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions are not intended to limit the scope of the invention.

The present invention has been made keeping in mind the above problems occurring in the prior art and/or the problems occurring in the prior art.

Therefore, the technical problems to be solved by the invention are that the existing underground ventilation devices are difficult to effectively guarantee the underground ventilation effect, and are difficult to ensure the stable and normal working state of the ventilation pipeline under a mine, so that the installation is inconvenient and the angle adjustment is inconvenient.

In order to solve the technical problems, the invention provides the following technical scheme: a mine underground exhaust pipeline system comprises a straight pipe assembly, a pipeline assembly and a pipeline assembly, wherein the straight pipe assembly comprises an exhaust straight pipe and a first flange arranged at one end of the exhaust straight pipe;

the bent pipe assembly comprises a guide bent pipe and a second flange arranged at the end part of the guide bent pipe;

the first flange is connected with the second flange, a first circular groove is formed in one surface, in contact with the second flange, of the first flange, a second circular groove is correspondingly formed in one surface, in contact with the first flange, of the second flange, and bearings are arranged in the first circular groove and the second circular groove;

an annular bulge is arranged on the end face of the first flange, an annular groove is arranged on the end face of the second flange, the annular groove and the annular bulge are consistent in contour, the annular bulge is embedded into the annular groove, and a sealing ring is arranged between the annular bulge and the bottom of the annular groove;

the second flange is also provided with an annular rotating groove, the cross section of the annular rotating groove is T-shaped, the annular rotating groove comprises a narrow groove formed by inward sinking of the end surface of the second flange and a wide groove positioned at the bottom of the narrow groove, and the width of the wide groove is greater than that of the narrow groove;

a fastening piece is arranged in the annular rotating groove, the fastening piece comprises a limiting block positioned in the wide groove and a limiting column positioned in the narrow groove, two side surfaces of the limiting block are in contact with the side wall of the wide groove, and the limiting column is provided with a threaded hole; the first flange is provided with a plurality of through holes, studs are arranged in the through holes, and the studs are connected with the threaded holes.

As a preferable aspect of the underground exhaust piping system for a mine of the present invention, wherein: one end, far away from the threaded hole, of the stud is connected with a limiting round table, and the diameter of the limiting round table is larger than that of the through hole.

As a preferable aspect of the underground exhaust piping system for a mine of the present invention, wherein: the limiting circular truncated cone is provided with first gears along the circumference, an adjusting ring is sleeved on the air exhaust straight pipe, one end of the adjusting ring is provided with a second gear, the second gear is meshed with the first gears, at least 3 through holes are formed, and the number of the fasteners, the number of the studs and the number of the through holes are consistent; each of the first gears is engaged with the second gear.

As a preferable aspect of the underground exhaust piping system for a mine of the present invention, wherein: the outer surface of one end, close to the first flange, of the air exhaust straight pipe is provided with an external thread, the adjusting ring is provided with an internal thread, and the external thread is in threaded connection with the internal thread.

As a preferable aspect of the underground exhaust piping system for a mine of the present invention, wherein: the adjusting ring extends along the axial direction to form a polygon prism.

As a preferable aspect of the underground exhaust piping system for a mine of the present invention, wherein: one end face, far away from the first flange, of the second flange is provided with a placing groove penetrating through the wide groove, and the fastener is installed in the annular rotating groove through the placing groove.

As a preferable aspect of the underground exhaust piping system for a mine of the present invention, wherein: the guide bent pipe is a 90-degree bent pipe.

As a preferable aspect of the underground exhaust piping system for a mine of the present invention, wherein: one end of the air exhaust straight pipe, which is far away from the bent pipe assembly, is connected with a power unit, the power unit comprises a ventilation pipe and a ventilation assembly, the ventilation pipe is connected with one end of the air exhaust straight pipe, and an annular fixed platform is arranged in the ventilation pipe; the ventilation assembly comprises a baffle arranged at the outer end of the ventilation pipe, a motor is arranged on the baffle, and an output shaft A of the motor extends into the ventilation pipe and is connected with a blade assembly.

The invention has the beneficial effects that: when the underground mine turns, the angle of the guide elbow can be adjusted according to the required angle, and when the vertical mine stretches into the branch channel with multiple orientations of the underground branch, the orientation of the guide elbow can be conveniently adjusted to install the pipeline.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:

fig. 1 is a schematic structural view of a mine underground exhaust duct system installed in a mine according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of an underground exhaust piping system for a mine according to an embodiment of the present invention;

FIG. 3 is an enlarged partial schematic view of FIG. 2 of the underground mine drainage piping system according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of an exploded view of the underground mine drainage piping system according to an embodiment of the present invention;

FIG. 5 is a schematic structural view of a power unit connected to a mine underground exhaust piping system according to an embodiment of the present invention;

FIG. 6 is a schematic cross-sectional view of the whole underground exhaust piping system according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of an exploded view of a power unit in the underground mine drainage piping system according to an embodiment of the present invention;

FIG. 8 is an enlarged partial schematic view of FIG. 6 of the underground mine drainage piping system according to an embodiment of the present invention;

FIG. 9 is an enlarged partial schematic view of FIG. 8 of the underground mine drainage piping system according to an embodiment of the present invention;

fig. 10 is a schematic structural view of a rotating member in the underground drainage pipe system according to an embodiment of the present invention.

In the figure: a straight tube assembly 100; an air exhaust straight pipe 101; a first flange 102; an elbow assembly 200; a guide elbow 201; a second flange 202; a first circular groove 102 a; a second circular groove 202 a; a bearing 103; an annular projection 102 b; an annular groove 202 b; a seal ring 104; the annular rotation groove 202 c; narrow grooves 202 d; wide slots 202 e; a fastener 203; a stopper 203 a; a stopper column 203 b; a threaded hole 203 c; a through hole 102 c; a stud 105; a limit boss 105 a; a first gear 105 b; an adjustment ring 106; a second gear 106 a; external threads 101 a; internal threads 106 b; a polygonal column 106 c; a placement slot 202 f; a vent tube 300; an annular stationary table 301; a ventilation assembly 400; a baffle 401; a motor 402; an output shaft A; a blade assembly 500; a rotation member 501; a blade 502; a fixing ring 503; a first hole 501 a; a second hole 501 e; a rotating shaft 502 a; a third hole 503 a; an annular groove 501 b; a third gear 504; a first end face gear 505; an annular slider 506; a second face gear 506 a; a limit boss 506 b; long slot 501 c; a spring 507; a through groove 501 d; a drive link 506 c; a fixed disk 508; a rotary cylinder 505 a; a third face gear 505 b; an operating disk 509; a fourth face gear 509 a; a first stop collar 508 a; a second stop collar 509 b; an annular retaining groove 509 c.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Example 1

Referring to fig. 1 to 4, the present embodiment provides an underground exhaust duct system for a mine, including a straight pipe assembly 100, including an exhaust straight pipe 101 and a first flange 102 disposed at one end of the exhaust straight pipe 101; the straight exhaust pipe 101 is a straight pipeline, and is installed in a mine with one straight end between the ground and the underground, and the first flange 102 is used for connecting with other sections of pipelines. The elbow assembly 200 comprises a guide elbow 201 and a second flange 202 arranged at the end part of the guide elbow 201; the guiding bent pipe 201 is a bent pipe with a certain bending angle, namely, the axes of two ends of the guiding bent pipe 201 are not collinear, and the guiding bent pipe is suitable for a part where an underground mine turns and provides a connecting part for two air exhaust straight pipes 101.

Further, the first flange 102 is connected with the second flange 202, a first circular groove 102a is formed in one surface, in contact with the second flange 202, of the first flange 102, a second circular groove 202a is correspondingly formed in one surface, in contact with the first flange 102, of the second flange 202, and a bearing 103 is arranged in each of the first circular groove 102a and the second circular groove 202 a; the bearing 103 is arranged between the two, so that the direction of the guide elbow 201 can be adjusted according to the trend of the underground mine. The end face of the first flange 102 is provided with an annular protrusion 102b, the end face of the second flange 202 is provided with an annular groove 202b, the annular groove 202b and the annular protrusion 102b are consistent in contour, the annular protrusion 102b is embedded into the annular groove 202b to play a role in positioning and preventing deviation, and a sealing ring 104 is arranged between the annular protrusion 102b and the bottom of the annular groove 202 b; the sealing ring 104 can prevent the toxic gas from leaking out.

Further, the second flange 202 is further provided with an annular rotating groove 202c, the trend of the annular rotating groove 202c is circular, and the cross section of the annular rotating groove 202c is T-shaped, that is, the annular rotating groove 202c includes a narrow groove 202d formed by the end surface of the second flange 202 being recessed inwards and a wide groove 202e located at the bottom of the narrow groove 202d, and the width of the wide groove 202e is greater than that of the narrow groove 202 d; a fastening piece 203 is arranged in the annular rotating groove 202c, the fastening piece 203 is used for being connected with the first flange 102, wherein the fastening piece 203 comprises a limiting block 203a positioned in the wide groove 202e and a limiting column 203b positioned in the narrow groove 202d, in order to prevent the fastening piece 203 from rotating, two side surfaces of the limiting block 203a are contacted with the side wall of the wide groove 202e, the self-rotation of the fastening piece 203 can be limited, and the limiting column 203b is provided with a threaded hole 203 c.

Correspondingly, the first flange 102 is provided with a plurality of through holes 102c, the through holes 102c are uniformly distributed along the circumference, studs 105 are arranged in the through holes 102c, and the studs 105 are connected with the threaded holes 203 c.

One end of the stud 105, which is far away from the threaded hole 203c, is connected with a limiting round table 105a, and the diameter of the limiting round table 105a is larger than that of the through hole 102 c. Thus, the stud 105 is equivalent to a bolt, and the position-limiting column 203b is a screw hole matched with the stud. Therefore, after the straight exhaust pipe 101 is fixedly installed, when the stud 105 and the limiting column 203b are screwed, the orientation of one end of the guiding bent pipe 201 is fixed, when the orientation of the guiding bent pipe 201 needs to be adjusted according to the trend of a mine, the stud 105 and the limiting column 203b can be unscrewed without being completely detached, and the guiding bent pipe 201 can be rotated by taking the first flange 102 as an axis as long as the guiding bent pipe is slightly loosened, and the limiting block 203a moves along with the annular rotating groove 202c and is fastened again after being adjusted to a proper position.

Preferably, if the number of the studs 105 is large, in order to facilitate time-saving adjustment, the limiting circular truncated cone 105a is circumferentially provided with a first gear 105b, the exhaust straight pipe 101 is sleeved with an adjusting ring 106, one end of the adjusting ring 106 is provided with a second gear 106a, and the second gear 106a is meshed with the first gear 105b, so that all the first gears 105b meshed with the adjusting ring 106 can be adjusted by operating the adjusting ring 106; at least 3 through holes 102c are arranged, and the number of the fasteners 203 and the number of the studs 105 are consistent with that of the through holes 102 c; each first gear 105b meshes with the second gear 106 a.

Further, an external thread 101a is arranged on the outer surface of one end of the straight exhaust pipe 101 close to the first flange 102, an internal thread 106b is arranged on the adjusting ring 106, and the external thread 101a is in threaded connection with the internal thread 106 b. Therefore, the adjusting ring 106 is connected with the air exhaust straight pipe 101 through threads, and the movement is avoided.

Preferably, the adjusting ring 106 extends along the axial direction to form a polygon prism 106c, which is convenient for adjustment by using a wrench, and the polygon prism 106c is a 12-prism in the present embodiment.

It should be noted that one end face of the second flange 202 far from the first flange 102 is provided with a placement groove 202f penetrating the wide groove 202e, and the size of the placement groove 202f is slightly larger than the maximum cross section of the fastener 203, so that the fastener 203 is installed in the annular rotating groove 202c through the placement groove 202 f.

In this embodiment, the guiding elbow 201 is a 90-degree elbow, when the underground mine turns, the angle of the guiding elbow 201 can be made according to the required angle, and when the vertical mine extends into the branch passage with multiple orientations of the underground branch, the orientation of the guiding elbow 201 can be conveniently adjusted to install the pipeline.

Example 2

Referring to fig. 5 to 10, a second embodiment of the present invention is based on the previous embodiment, and is different from the previous embodiment in that: one end of the straight exhaust pipe 101, which is far away from the bent pipe assembly 200, is connected with a power unit, the power unit comprises a ventilation pipe 300 and a ventilation assembly 400, the ventilation pipe 300 is connected with one end of the straight exhaust pipe 101, and an annular fixed platform 301 is arranged in the ventilation pipe 300; the ventilation pipe 300 is of a pipe type and is installed in a passage of a mine, and the annular fixed platform 301 is arranged in the ventilation pipe 300 and used as a support for installing the ventilation assembly 400; the ventilation assembly 400 comprises a baffle 401 arranged at the outer end of the ventilation pipe 300, a motor 402 is arranged on the baffle 401, and the baffle 401 is used for mounting the motor 402 and preventing external objects from falling into a mine to play a role in protection; the output shaft a of the motor 402 extends into the ventilation tube 300 and is connected to a vane assembly 500. the vane assembly 500 is capable of ventilating and exhausting the mine interior.

Specifically, the blade assembly 500 includes a rotating member 501 connected to the output shaft of the motor 402, and the rotating member 501 may be fixed to the output shaft of the motor 402 by bolts. The rotating component 501 is provided with a plurality of blades 502 which are uniformly distributed along the circumference, in this embodiment, the number of the blades 502 is 6, the blades 502 are arranged outside the rotating component 501 in a surrounding manner, the blades 502 are planar, the fan angle of each blade is 60 degrees, and when all the blades 502 are in the same plane, the blades 502 and the rotating component 501 just can block the through opening of the annular fixing platform 301.

Further, one end of the blade 502, which is far away from the rotating member 501, is connected with a fixing ring 503, the fixing ring 503 is rotatably connected with the annular fixing table 301, the connection mode can be that the blade 502 is fixedly arranged between the fixing ring 503 and the rotating member 501, the rotating member 501 is provided with a first hole 501a along the axial direction, the first hole 501a is fixedly connected with an output shaft of the motor 402 and can be connected through a fastening screw, the rotating member 501 is provided with a second hole 501e along the radial direction, and the second holes 501e are the same as the blades 502 in number and are uniformly distributed along the circumference of the rotating member 501; the blade 502 is provided with a rotating shaft 502a, the rotating shaft 502a is arranged at the symmetrical center line of the blade 502, the fixing ring 503 is provided with third holes 503a, the number of the third holes 503a is uniformly 6, one end of the rotating shaft 502a is embedded into the second hole 501e, and the other end of the rotating shaft 502a is embedded into the third hole 503a, so that the blade 502 can rotate by taking the rotating shaft 502a as the axis, and the ventilation volume is adjusted.

Further, the rotating member 501 is provided with an annular groove 501b, the annular groove 501b is located outside the first hole 501a, the annular groove 501b is coaxial with the first hole 501a, one end of the rotating shaft 502a extends into the annular groove 501b, a portion of the rotating shaft 502a located in the annular groove 501b is connected with a third gear 504, a first face gear 505 is arranged in the annular groove 501b, the first face gear 505 is in meshed connection with the third gear 504, and the first face gear 505 is located at a notch of the annular groove 501b, so that the angle of the third gear 504, i.e., the blade 502, can be adjusted by operating the rotation of the first face gear 505; an annular slider 506 is arranged between the bottom surface of the annular groove 501b and the third gear 504, the annular slider 506 is annular and can move in the annular groove 501b along the axial direction, a second end face gear 506a is arranged on one end face of the annular slider 506 close to the third gear 504, when the annular slider 506 moves towards the third gear 504, the second end face gear 506a can be meshed with the third gear 504, and the second end face gear 506a can limit the rotation of the third gear 504 because the annular slider 506 is not rotatable, so that the angle of the blade 502 is fixed; the annular slider 506 is provided with a limiting boss 506b, the side wall of the annular groove 501b is provided with a long groove 501c extending along the axial direction of the annular groove 501b, and the limiting boss 506b is embedded in the long groove 501c, so that the rotational freedom degree of the annular slider 506 along the axis can be limited, and the annular slider 506 can only move in the axial direction in the annular groove 501 b.

Preferably, a spring 507 is disposed between the annular slider 506 and the bottom surface of the annular groove 501 b. The spring 507 is a tension spring, that is, when the spring 507 is not operated, the elastic force of the spring 507 causes the annular slider 506 to move toward the third gear 504, so that the second end face gear 506a restricts the rotation of the third gear 504.

Further, the side wall of the annular groove 501b is further provided with a through groove 501d extending along the axial direction, the through groove 501d extends to the end face of the rotating member 501, the annular slider 506 is provided with a transmission rod 506c extending along the axial direction, the transmission rod 506c can be welded on the annular slider 506, the transmission rod 506c penetrates through the through groove 501d and extends to the outside of the through groove 501d, therefore, the movement of the annular slider 506 is consistent with that of the transmission rod 506c, one end of the transmission rod 506c located outside the through groove 501d is connected with a fixed disc 508, the fixed disc 508 is also annular and can be connected with the transmission rod 506c through screws or welding; a rotating cylinder 505a is disposed in the annular groove 501b, the rotating cylinder 505a is fixedly connected to the first end face gear 505, preferably, the rotating cylinder 505a and the first end face gear 505 are integrally formed, and a third end face gear 505b is disposed on an end face of the rotating cylinder 505a located outside the annular groove 501b, that is, end face gears are disposed on both ends of the rotating cylinder 505a, and the rotation of the first end face gear 505 is controlled by the third end face gear 505 b.

An operation disc 509 is connected to one end face, far away from the transmission rod 506c, of the fixed disc 508, the end face of the operation disc 509 is attached to the end face of the fixed disc 508, the operation disc 509 is circular and can rotate relative to the fixed disc 508, the operation disc 509 is sleeved on the periphery of an output shaft of the motor 402, and a fourth face gear 509a is arranged on the outer ring of the operation disc 509; wherein when the fourth face gear 509a is engaged with the third face gear 505b, the second face gear 506a is separated from the third gear 504; when the second face gear 506a is engaged with the third gear 504, the fourth face gear 509a is disengaged from the third face gear 505 b. Therefore, when the blade tilt angle needs to be adjusted, the second face gear 506a needs to be separated from the third gear 504, the fourth face gear 509a is meshed with the third face gear 505b, then the adjustment is performed by operating the operation disc 509, after the adjustment is completed, the second face gear 506a is reset and meshed with the third gear 504 again for limiting under the action of the spring, and meanwhile, the fourth face gear 509a is separated from the third face gear 505b, and at this time, the blade cannot be adjusted even if the operation disc 509 is rotated.

Further, the operating disk 509 is not axially displaceable with respect to the fixed disk 508, so that the outer periphery of the fixed disk 508 is provided with a first stopper 508a, a second stopper 509b is provided on a surface of the operating disk 509 in contact with the fixed disk 508, the second stopper 509b is provided with an annular stopper groove 509c, and the first stopper 508a is fitted into the annular stopper groove 509c, so that the operating disk 509 is only rotatable with respect to the fixed disk 508 and is not axially displaceable.

In this embodiment, when the power size of motor is certain, can adjust the air volume through the deflection angle of adjusting the blade, ventilate or discharge harmful gas to the mine. And when the deflection angle of all the blades is 0 degrees, namely the blades are positioned on the same horizontal plane, the ventilation quantity is close to 0, namely the ventilation opening is sealed, and other external objects are prevented from falling into the mine.

It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.

Claims

1. The utility model provides a mine underground exhaust piping system which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,

the straight pipe assembly (100) comprises an exhaust straight pipe (101) and a first flange (102) arranged at one end of the exhaust straight pipe (101);

an elbow assembly (200) comprising a guide elbow (201) and a second flange (202) disposed at an end of the guide elbow (201);

the first flange (102) is connected with the second flange (202), a first circular groove (102 a) is formed in one surface, in contact with the second flange (202), of the first flange (102), a second circular groove (202 a) is correspondingly formed in one surface, in contact with the first flange (102), of the second flange (202), and bearings (103) are arranged in the first circular groove (102 a) and the second circular groove (202 a);

an annular bulge (102 b) is arranged on the end face of the first flange (102), an annular groove (202 b) is arranged on the end face of the second flange (202), the annular groove (202 b) is consistent with the annular bulge (102 b) in contour, the annular bulge (102 b) is embedded into the annular groove (202 b), and a sealing ring (104) is arranged between the annular bulge (102 b) and the bottom of the annular groove (202 b);

the second flange (202) is further provided with an annular rotating groove (202 c), the cross section of the annular rotating groove (202 c) is T-shaped, the annular rotating groove (202 c) comprises a narrow groove (202 d) formed by the end face of the second flange (202) sinking inwards and a wide groove (202 e) located at the bottom of the narrow groove (202 d), and the width of the wide groove (202 e) is larger than that of the narrow groove (202 d);

a fastening piece (203) is arranged in the annular rotating groove (202 c), the fastening piece (203) comprises a limiting block (203 a) positioned in a wide groove (202 e) and a limiting column (203 b) positioned in a narrow groove (202 d), two side surfaces of the limiting block (203 a) are in contact with the side wall of the wide groove (202 e), and the limiting column (203 b) is provided with a threaded hole (203 c);

the first flange (102) is provided with a plurality of through holes (102 c), studs (105) are arranged in the through holes (102 c), and the studs (105) are connected with the threaded holes (203 c).

2. The underground ventilation piping system for mines of claim 1, wherein: one end, far away from the threaded hole (203 c), of the stud (105) is connected with a limiting round table (105 a), and the diameter of the limiting round table (105 a) is larger than that of the through hole (102 c).

3. The underground ventilation piping system for mines of claim 2, wherein: the limiting circular truncated cone (105 a) is provided with a first gear (105 b) along the circumference, the air exhaust straight pipe (101) is sleeved with an adjusting ring (106), one end of the adjusting ring (106) is provided with a second gear (106 a), the second gear (106 a) is meshed with the first gear (105 b) and connected with the first gear, at least 3 through holes (102 c) are formed, and the number of the fasteners (203) and the number of the studs (105) are the same as that of the through holes (102 c); each of the first gears (105 b) is meshed with the second gear (106 a).

4. The underground ventilation piping system for mines of claim 3, wherein: the outer surface of one end, close to the first flange (102), of the air exhaust straight pipe (101) is provided with an external thread (101 a), the adjusting ring (106) is provided with an internal thread (106 b), and the external thread (101 a) is in threaded connection with the internal thread (106 b).

5. The underground ventilation piping system for mines according to claim 4, wherein: the adjusting ring (106) extends along the axial direction to form a polygon prism (106 c).

6. The underground ventilation piping system for mines of claim 5, wherein: one end face, far away from the first flange (102), of the second flange (202) is provided with a placing groove (202 f) penetrating through the wide groove (202 e), and the fastening piece (203) is installed in the annular rotating groove (202 c) through the placing groove (202 f).

7. The underground ventilation piping system for mines of claim 6, wherein: the guide bent pipe (201) is a 90-degree bent pipe.

8. The underground ventilation piping system for mines of claim 7, wherein: one end, far away from the bent pipe assembly (200), of the air exhaust straight pipe (101) is connected with a power unit, the power unit comprises a ventilation pipe (300) and a ventilation assembly (400), the ventilation pipe (300) is connected with one end of the air exhaust straight pipe (101), and an annular fixed table (301) is arranged in the ventilation pipe (300); the ventilation assembly (400) comprises a baffle (401) arranged at the outer end of the ventilation pipe (300), a motor (402) is arranged on the baffle (401), and an output shaft (A) of the motor (402) extends into the ventilation pipe (300) and is connected with a blade assembly (500).