A large ventilation volume multi-stage ventilation device for mines

Abstract

The present invention proposes a large-volume multi-stage ventilation device for mines, which relates to the field of mine ventilation equipment. It includes a ventilation main duct, a ventilation sub-duct and a return duct. The ventilation main duct is connected to the ventilation sub-duct. A first air supply device is provided on the ventilation main duct. A second air supply device is provided at the connection point between the ventilation main duct and the ventilation sub-duct. A circulation component for guiding airflow is provided on the output end of the ventilation sub-duct. An exhaust device is provided in the return duct. A cleaning component for cleaning gas is provided at the input end of the return duct. A ventilation main duct and a first air supply device connected to the ventilation duct are provided in the mine tunnel to guide a large amount of fresh air from the outside into the main ramp of the tunnel, and then the external air is diverted and guided through at least three ventilation sub-ducts connected to the ventilation main duct, and the flow rate of gas circulating through the ventilation sub-duct per unit time is accelerated through the second air supply device; thereby accelerating the air transportation efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of mine ventilation equipment, and in particular to a large ventilation volume multi-stage ventilation device used in mines. Background Art

[0002] With the increasing attention paid to mine ventilation safety, the quality of mine ventilation is directly related to the life safety of miners, safe production and economic benefits of mines. If the total air intake of mine tunnels is small and the air quality is poor, it is easy to cause serious occupational hazards, which may lead to the poisoning death of miners or "mass death and injury" safety accidents.

[0003] The air under the mine tunnel is thin due to the enclosed space, and toxic gases are generated inside, which greatly threatens the life safety of miners. The problems of the existing technology are:

[0004] The ventilation equipment in the tunnel is affected by the length of the tunnel, as well as factors such as the poor and discontinuous ventilation of the ventilation equipment. This can easily lead to the upward wind flow in the high chute being affected by the polluted wind flow from the lower operation when the wind flows into the working area from the main ramp and the lower high chute. This results in an obvious lack of ventilation capacity, as well as poor ventilation, smoke and dust exhaust effects of the upper capacity expansion project and a poor working environment. It also leads to an obvious lack of ventilation power in the mine, and the total air intake of the mine is seriously small, which seriously affects the smoke and dust exhaust problems in the mine's working area.

[0005] In addition, mine tunnel ventilation is mostly of the exhaust type and the air supply type, but the exhaust type and the air supply type each have their own advantages and disadvantages. The exhaust type requires the ventilation duct to reach a certain pressure resistance, which increases the cost of use. The air supply type is prone to generate dust and reduces efficiency. Therefore, a ventilation device that can clean the air inside the mine is needed to increase the safety of underground workers. Summary of the invention

[0006] The object of the present invention is to provide a large ventilation volume multi-stage ventilation device for mines, which can solve the problems raised by the above-mentioned background technology.

[0007] The embodiment of the present invention is achieved as follows:

[0008] An embodiment of the present application provides a large-ventilation-volume multi-stage ventilation device for use in mines, comprising a main ventilation duct, a secondary ventilation duct and a return duct, the main ventilation duct being connected to the secondary ventilation duct, a first air supply device being provided on the main ventilation duct, a second air supply device being provided at the connection between the main ventilation duct and the secondary ventilation duct, a circulation component for guiding airflow being provided on the output end of the secondary ventilation duct, an exhaust device being provided in the return duct, and a cleaning component for cleaning gas being provided at the input end of the return duct.

[0009] In some embodiments of the present invention, there are multiple groups of flow components, and the multiple groups of flow components are equidistantly arranged on the outer wall of the ventilation secondary duct.

[0010] In some embodiments of the present invention, the circulation component includes a shell that is sleeved on the outer wall of the ventilation sub-duct, and a plurality of air ducts connected to the outer wall of the shell are arranged around the outer wall of the shell. The air ducts are connected to the ventilation sub-duct, and a plurality of air vents are opened on the outer wall of the shell, and an air guide fan is rotated in each of the air vents.

[0011] In some embodiments of the present invention, the cleaning component includes an isolation net adapted to the inner diameter of the return pipe, two mounting rings adapted thereto are provided in the return pipe, a plurality of fan blades are slidably provided on the inner wall of the mounting ring, the free ends of the plurality of fan blades are interconnected, a discharge outlet is provided on the outer wall of the return pipe, and the isolation net and the discharge outlet are both placed between the two mounting rings.

[0012] In some embodiments of the present invention, a brush strip abutting against the isolation net is provided on the side wall of the fan blade along its extension direction.

[0013] In some embodiments of the present invention, a pipe diameter component for scaling the diameter of the return pipe or the ventilation auxiliary pipe is further included, and the pipe diameter component is arranged at the output end of the return pipe or the output end of the ventilation auxiliary pipe.

[0014] In some embodiments of the present invention, the pipe diameter assembly includes a rubber sleeve, the inner wall of the rubber sleeve is provided with a plurality of arc-shaped sleeves equidistantly along its circumference, an arc-shaped support rod is provided between any two adjacent sleeves, a part of the support rod is embedded in the sleeve, a return spring connected to the inner wall of the sleeve is provided on the outer wall of the support rod, an air bag abutting the support rod is provided in the sleeve, an air pipe connected to the air bag is passed through the rubber sleeve, an air filling and deflation device connected to the air bag is provided at the free end of the air pipe, and the rubber sleeve is provided at the output end of the reflux duct or the output end of the ventilation auxiliary duct.

[0015] In some embodiments of the present invention, a mounting base is further included, on which a support frame is disposed, and a plurality of buffer rings abutting against the secondary ventilation duct are sleeved, and the buffer rings are slidably disposed on the support frame.

[0016] In some embodiments of the present invention, the secondary ventilation duct is a bellows.

[0017] In some embodiments of the present invention, a buffer spring abutting against the outer wall of the secondary ventilation duct is provided on the inner wall of the buffer ring.

[0018] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0019] An embodiment of the present application provides a large-ventilation-volume multi-stage ventilation device for use in mines, comprising a main ventilation duct, a secondary ventilation duct and a return duct, the main ventilation duct being connected to the secondary ventilation duct, a first air supply device being provided on the main ventilation duct, a second air supply device being provided at the connection between the main ventilation duct and the secondary ventilation duct, a circulation component for guiding airflow being provided on the output end of the secondary ventilation duct, an exhaust device being provided in the return duct, and a cleaning component for cleaning gas being provided at the input end of the return duct. The large-air-volume multi-stage ventilation device set up in the mine by the present technical scheme mainly solves the problem that the ventilation equipment in the tunnel of the prior art is affected by the tunnel length, as well as the factors such as the unsmooth and discontinuous ventilation of the ventilation equipment, which easily leads to the upward wind flow in the high chute being affected by the polluted wind flow in the lower operation when the wind flows into the working area from the main ramp and the lower high chute, resulting in obviously insufficient ventilation capacity, and also leading to poor ventilation, smoke and dust exhaust effects of the upper capacity expansion project and poor working environment. It also leads to obviously insufficient ventilation power in the mine, and the total air intake volume of the mine is seriously small, which seriously affects the smoke and dust exhaust problems in the working area of ​​the mine. In order to solve the above problems, the present technical scheme sets a ventilation main duct and a first air supply device connected to the ventilation duct in the mine tunnel to guide a large amount of fresh air from the outside into the main ramp of the tunnel, and then At least three ventilation sub-ducts connected to the ventilation main duct are used to divert and guide the added air, thereby increasing the circulation rate of the air supply, and the flow rate of the gas circulating through the ventilation sub-duct per unit time is accelerated through the second air supply equipment; thereby increasing the air transportation efficiency and avoiding the shortage of oxygen supply in the tunnel; and a circulation component for guiding the airflow arranged at the output end of the ventilation sub-duct can prevent the high-speed gas from knocking away the dust accumulated in the tunnel, causing the dust in the tunnel to be suspended in the air, resulting in turbid air; and at least three return ducts are laid in the main ramp and the lower high chute, which discharge the exhaust gas in the working areas such as the lower high chute under the action of the inflation equipment, so as to realize the replacement of the air in the working areas such as the lower high chute with the outside world, and ensure that the oxygen in the working areas reaches the environment required for work. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the combined structure of the flow assembly and the ventilation auxiliary duct in the present invention;

[0023] Figure 3 is a top view schematic diagram of the pipe diameter assembly of the present invention;

[0024] Figure 4 It is a bottom view schematic diagram of the cleaning component in the present invention;

[0025] Figure 5 It is a schematic cross-sectional structural diagram of the cleaning component in the present invention.

[0026] Icons: 1. First air supply device; 2. Exhaust equipment; 3. Main ventilation duct; 4. Second air supply device; 5. Auxiliary ventilation duct; 6. Return duct; 7. Mounting base; 8. Support frame; 9. Buffer ring; 10. Buffer spring; 11. Shell; 12. Air guide duct; 13. Fan guide fan; 14. Rubber sleeve; 15. Solenoid valve; 16. Sleeve; 17. Air bag; 18. Reset spring; 19. Mounting ring; 20. Isolation net; 21. Fan blades; 22. Brush strips; 23. Support rod. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the embodiments of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the description of the embodiments of the present invention, "plurality" means at least 2.

[0033] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Example

[0035] Please refer to Figure 1-Figure 5 As shown, Figure 1 It is a schematic diagram of the main structure of the present invention; Figure 2 It is a schematic diagram of the combined structure of the flow assembly and the ventilation auxiliary duct 5 in the present invention; Figure 3 is a top view schematic diagram of the pipe diameter assembly of the present invention; Figure 4 It is a bottom view schematic diagram of the cleaning component in the present invention; Figure 5 It is a schematic cross-sectional structural diagram of the cleaning component in the present invention.

[0036] An embodiment of the present application provides a large-ventilation-volume multi-stage ventilation device for use in mines, comprising a main ventilation duct 3, a secondary ventilation duct 5 and a return duct 6. The main ventilation duct 3 is connected to the secondary ventilation duct 5. A first air supply device 1 is provided on the main ventilation duct 3. A second air supply device 4 is provided at the connection between the main ventilation duct 3 and the secondary ventilation duct 5. A circulation component for guiding airflow is provided on the output end of the secondary ventilation duct 5. An exhaust device 2 is provided in the return duct 6. A cleaning component for cleaning gas is provided at the input end of the return duct 6. The large-air-volume multi-stage ventilation device set up in the mine by the present technical scheme mainly solves the problem that the ventilation equipment in the tunnel of the prior art is affected by the tunnel length, as well as the factors such as the unsmooth and discontinuous ventilation of the ventilation equipment, which easily leads to the upward wind flow in the high chute being affected by the polluted wind flow in the lower operation when the wind flows into the working area from the main ramp and the lower high chute, resulting in obviously insufficient ventilation capacity, and also leading to poor ventilation, smoke and dust exhaust effects of the upper capacity expansion project and poor working environment. It also leads to obviously insufficient ventilation power in the mine, and the total air intake volume of the mine is seriously small, which seriously affects the smoke and dust exhaust problems in the working area of ​​the mine. In order to solve the above problems, the present technical scheme sets a ventilation main duct 3 and a first air supply device 1 connected to the ventilation duct in the mine tunnel to guide a large amount of fresh air from the outside into the main ramp of the tunnel, and then through At least three ventilation sub-ducts 5 connected to the ventilation main duct 3 will divert and guide the added air, increase the circulation rate of the air supply, and accelerate the flow rate of the gas circulating through the ventilation sub-duct 5 per unit time through the second air supply device 4; thereby accelerating the air transportation efficiency and avoiding the occurrence of insufficient oxygen supply in the tunnel; and a circulation component for guiding the airflow arranged at the output end of the ventilation sub-duct 5 can prevent the high-speed gas from knocking away the dust accumulated in the tunnel, causing the dust in the tunnel to be suspended in the air, resulting in turbid air; and at least three return ducts 6 are laid in the main ramp and the lower high chute, which will discharge the exhaust gas in the working area such as the lower high chute under the action of the inflation equipment, so as to realize the replacement of the air in the working area such as the lower high chute with the outside world, and ensure that the oxygen in the working area reaches the environment required for work.

[0037] Furthermore, the first air supply device 1 and the second air supply device 4 are both 30kW fans.

[0038] Furthermore, a circulation component for guiding airflow is provided at the air inlet of the return pipe 6 to prevent the return pipe 6 from absorbing dust in the tunnel, causing excessive dust to be mixed in the air, affecting the life and health of the workers. The input port of the return pipe 6 is placed in front of the ventilation auxiliary pipe, which can guide the air entering the tunnel and ensure that fresh air quickly fills the working space.

[0039] In some embodiments of the present invention, there are multiple groups of circulation components, and the multiple groups of circulation components are equidistantly arranged on the outer wall of the ventilation secondary duct 5. Setting the number of circulation components to at least three groups can increase the air outlet efficiency of the ventilation secondary duct 5, that is, speed up the oxygen replacement efficiency, and ensure sufficient oxygen supply in the tunnel.

[0040] In some embodiments of the present invention, the circulation component includes a shell 11 sleeved on the outer wall of the ventilation auxiliary duct 5, and a plurality of air ducts 12 connected thereto are arranged around the outer wall of the shell 11, the air duct 12 is connected to the ventilation auxiliary duct 5, and a plurality of vents are provided on the outer wall of the shell 11, and a guide fan 13 is rotatably arranged in each of the vents. The shell 11 sleeved on the outer wall of the ventilation auxiliary duct 5 will introduce gas into the shell 11 through the air duct 12, so as to prevent the high-pressure gas guided by the second air supply device 4 from knocking the dust in the tunnel away, causing excessive dust in the tunnel, and then the gas is diverted and discharged from the shell 11 through the plurality of vents arranged on the outer wall of the shell 11 and the guide fan 13 rotatably arranged in the vent, so as to guide the air entering the tunnel and ensure that fresh air quickly fills the working space.

[0041] In some embodiments of the present invention, the cleaning component includes an isolation net 20 adapted to the inner diameter of the return pipe 6, and two mounting rings 19 adapted thereto are provided in the return pipe 6. A plurality of fan blades 21 are slidably provided on the inner wall of the mounting ring 19, and the free ends of the plurality of fan blades 21 are interconnected. A discharge outlet is provided on the outer wall of the return pipe 6, and the isolation net 20 and the discharge outlet are both placed between the two mounting rings 19. An isolation net 20 is arranged in the return duct 6 and adapted thereto, and the mesh number of the isolation net 20 is 100 meshes, which can isolate most of the dust passing through the return duct 6, and prevent the dust from clogging the return duct 6 or adhering to the inner wall of the return duct 6, affecting the efficiency of the return duct 6 in replacing air; and the isolation net 20 and the exhaust port are placed between two mounting rings 19, and the dust attachments attached to the isolation net 20 can be scraped off by rotating the fan blades 21 arranged on the mounting rings 19, so as to prevent the attachments from clogging the isolation net 20 and affecting the reflux capacity of the return duct 6, thereby reducing the air replacement efficiency of the equipment in the tunnel; and the fan blades 21 are in contact with the isolation net 20, so as to improve the cleaning ability of the fan blades 21 on the isolation net 20 as much as possible.

[0042] In some embodiments of the present invention, a brush strip 22 is provided on the side wall of the fan blade 21 along its extension direction, which is in contact with the isolation net 20. The brush strip 22 provided on the fan blade 21 in contact with the isolation net 20 scrapes off the dust attached to the isolation net 20 to prevent it from clogging the isolation net 20, affecting the reflux capacity of the reflux duct 6, and reducing the air replacement efficiency of the equipment in the tunnel. The brush strip 22 improves the cleaning ability of the fan blade 21 to the attachments on the isolation net 20 as much as possible, and reduces the cleaning of the equipment by workers, thereby realizing the self-cleaning ability.

[0043] Furthermore, the bristle strip 22 is fixed to the fan blade 21 by means of bolts.

[0044] In some embodiments of the present invention, a pipe diameter component for scaling the pipe diameter of the return pipe 6 or the ventilation auxiliary pipe 5 is also included, and the pipe diameter component is arranged at the output end of the return pipe 6 or the output end of the ventilation auxiliary pipe 5. The pipe diameter component arranged in the return pipe 6 or the ventilation auxiliary pipe 5 for scaling the pipe diameter thereof can control the air extraction volume of the return pipe 6 and the air outlet volume of the ventilation auxiliary pipe 5, improve the return capacity of the return pipe 6, and increase the air replacement capacity of the equipment in the tunnel.

[0045] In some embodiments of the present invention, the pipe diameter assembly includes a rubber sleeve 14, on the inner wall of the rubber sleeve 14, a plurality of arc-shaped sleeves 16 are equidistantly arranged along the circumference thereof, an arc-shaped support rod 23 is arranged between any two adjacent sleeves 16, a part of the support rod 23 is embedded in the sleeve 16, a return spring 18 connected to the inner wall of the sleeve 16 is sleeved on the outer wall of the support rod 23, an air bag 17 abutting against the support rod 23 is arranged in the sleeve 16, an air pipe connected to the air bag 17 is passed through the rubber sleeve 14, and an air filling and deflation device connected to the air bag 17 is arranged at the free end of the air pipe, and the rubber sleeve 14 is sleeved at the output end of the reflux pipe 6 or the output end of the ventilation auxiliary pipe 5. The rubber sleeve 14 arranged in the pipe diameter component will increase the adaptability of the equipment and extend its service life when actually used; and the rubber sleeve 14 has self-expansion ability and good expansion and contraction ability, and the arc-shaped sleeve 16 is integrally formed with the rubber sleeve 14, and a fixing block is provided on the sleeve ring and embedded in the rubber sleeve 14; while an arc-shaped support rod 23 is provided between any two adjacent sleeves 16 to support the rubber sleeve 14, the air bag 17 can also be inflated and deflated by the inflation and deflation equipment, so as to control the movement of the support rod 23 and the sleeve 16, and control the elongation of the support rod 23 in the sleeve 16, and then be used to scale the diameter of the rubber sleeve 14, and then control the exhaust volume of the return pipe 6 and the air outlet volume of the ventilation auxiliary pipe 5, thereby improving the reflux capacity of the return pipe 6, and increasing the air replacement capacity of the equipment in the tunnel.

[0046] Furthermore, the support rod 23 is integrally formed with the inner wall of the rubber sleeve 14 via a sealing strip.

[0047] In some embodiments of the present invention, a mounting base 7 is further included, a support frame 8 is provided on the mounting base 7, a plurality of buffer rings 9 abutting against the secondary ventilation duct 5 are sleeved thereon, and the buffer rings 9 are slidably arranged on the support frame 8. The mounting base 7 can provide support for the secondary ventilation duct 5, and can also buffer and fix the secondary ventilation duct 5 through the support frame 8 and the buffer member slidably arranged on the support frame 8, so as to prevent the secondary ventilation duct 5 from being impacted by high-pressure gas for a long time; and the buffer ring 9 sleeved thereon and abutting against the secondary ventilation duct 5 can increase the structural strength of the secondary ventilation duct 5, so as to prevent the secondary ventilation duct 5 from being damaged after being subjected to excessive force, which greatly reduces the problem of reducing its service life.

[0048] In some embodiments of the present invention, the ventilation auxiliary duct 5 is a bellows. Designing the ventilation auxiliary duct 5 as a bellows can make it rely on its own structure to consume the impact force generated by high-velocity air, which can increase the structural strength of the ventilation auxiliary duct 5, and avoid the impact force generated by high-velocity air from impacting the pipe body, causing it to be damaged after being subjected to excessive force, resulting in a reduction in its service life. The ventilation auxiliary duct 5 and the rubber sleeve 14 in the pipe diameter assembly are provided with a solenoid valve 15 for opening and closing the ventilation auxiliary duct 5.

[0049] In some embodiments of the present invention, a buffer spring 10 is provided on the inner wall of the buffer ring 9 and abuts against the outer wall of the ventilation auxiliary pipe 5. The buffer ring 9 sleeved on the ventilation auxiliary pipe 5 and abutting against it can increase the structural strength of the ventilation auxiliary pipe 5 to prevent it from being damaged after being subjected to excessive force, and the buffer spring 10 provided on the inner wall of the buffer ring 9 can further absorb the impact force released by the pipe, thereby increasing the service life of the device.

[0050] To summarize, the embodiment of the present application provides a large-ventilation-volume multi-stage ventilation device for mines, comprising a main ventilation duct 3, a secondary ventilation duct 5 and a return duct 6. The main ventilation duct 3 is connected to the secondary ventilation duct 5. A first air supply device 1 is provided on the main ventilation duct 3. A second air supply device 4 is provided at the connection between the main ventilation duct 3 and the secondary ventilation duct 5. A circulation component for guiding airflow is provided on the output end of the secondary ventilation duct 5. An exhaust device 2 is provided in the return duct 6. A cleaning component for cleaning gas is provided at the input end of the return duct 6. The large-air-volume multi-stage ventilation device set up in the mine by the present technical scheme mainly solves the problem that the ventilation equipment in the tunnel of the prior art is affected by the tunnel length, as well as the factors such as the unsmooth and discontinuous ventilation of the ventilation equipment, which easily leads to the upward wind flow in the high chute being affected by the polluted wind flow in the lower operation when the wind flows into the working area from the main ramp and the lower high chute, resulting in obviously insufficient ventilation capacity, and also leading to poor ventilation, smoke and dust exhaust effects of the upper capacity expansion project and poor working environment. It also leads to obviously insufficient ventilation power in the mine, and the total air intake volume of the mine is seriously small, which seriously affects the smoke and dust exhaust problems in the working area of ​​the mine. In order to solve the above problems, the present technical scheme sets a ventilation main duct 3 and a first air supply device 1 connected to the ventilation duct in the mine tunnel to guide a large amount of fresh air from the outside into the main ramp of the tunnel, and then through At least three ventilation sub-ducts 5 connected to the ventilation main duct 3 will divert and guide the added air, increase the circulation rate of the air supply, and accelerate the flow rate of the gas circulating through the ventilation sub-duct 5 per unit time through the second air supply device 4; thereby accelerating the air transportation efficiency and avoiding the occurrence of insufficient oxygen supply in the tunnel; and a circulation component for guiding the airflow arranged at the output end of the ventilation sub-duct 5 can prevent the high-speed gas from knocking away the dust accumulated in the tunnel, causing the dust in the tunnel to be suspended in the air, resulting in turbid air; and at least three return ducts 6 are laid in the main ramp and the lower high chute, which will discharge the exhaust gas in the working area such as the lower high chute under the action of the inflation equipment, so as to realize the replacement of the air in the working area such as the lower high chute with the outside world, and ensure that the oxygen in the working area reaches the environment required for work.

[0051] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-stage ventilation device with large ventilation volume for mines, It is characterized in that It comprises a ventilation main duct, a ventilation sub-duct and a return duct, wherein the ventilation main duct is connected with the ventilation sub-duct, a first air supply device is arranged on the ventilation main duct, a second air supply device is arranged at the connection point between the ventilation main duct and the ventilation sub-duct, a circulation component for guiding airflow is arranged on the output end of the ventilation sub-duct, an air extraction device is arranged in the return duct, and a cleaning component for cleaning gas is arranged at the input end of the return duct; It also includes a pipe diameter component for scaling the pipe diameter of the return pipe or the ventilation auxiliary pipe, wherein the pipe diameter component is arranged at the output end of the return pipe or the output end of the ventilation auxiliary pipe; The pipe diameter assembly includes a rubber sleeve, and a plurality of arc-shaped sleeves are equidistantly arranged on the inner wall of the rubber sleeve along its circumference, and an arc-shaped support rod is arranged between any two adjacent sleeves, and a part of the support rod is embedded in the sleeve, and a return spring connected to the inner wall of the sleeve is sleeved on the outer wall of the support rod, and an air bag abutting the support rod is arranged in the sleeve, and an air pipe connected to the air bag is passed through the rubber sleeve, and an air filling and deflation device connected to the air bag is arranged at the free end of the air pipe, and the rubber sleeve is arranged at the output end of the reflux pipe or the output end of the ventilation auxiliary pipe.

2. A large ventilation volume multi-stage ventilation device for mines according to claim 1, It is characterized in that The number of the circulation components is multiple groups, and the multiple groups of circulation components are equidistantly arranged on the outer wall of the ventilation secondary duct.

3. A large ventilation volume multi-stage ventilation device for mines according to claim 2, It is characterized in that The circulation component includes a shell that is sleeved on the outer wall of the ventilation sub-duct. The outer wall of the shell is surrounded by a plurality of air ducts connected to the shell. The air ducts are connected to the ventilation sub-duct. The outer wall of the shell is provided with a plurality of air vents, and an air guide fan is rotated in each of the air vents.

4. A large ventilation volume multi-stage ventilation device for mines according to claim 1, It is characterized in that The cleaning assembly includes an isolation net that is adapted to the inner diameter of the return pipe. Two mounting rings that are adapted to the isolation net are provided in the return pipe. A plurality of fan blades are slidably provided on the inner wall of the mounting ring. The free ends of the plurality of fan blades are interconnected. A discharge port is provided on the outer wall of the return pipe. The isolation net and the discharge port are both placed between the two mounting rings.

5. A large ventilation volume multi-stage ventilation device for mines according to claim 4, It is characterized in that A brush strip abutting against the isolation net is provided on the side wall of the fan blade along its extending direction.

6. A large ventilation volume multi-stage ventilation device for mines according to any one of claims 1 to 5, It is characterized in that It also includes a mounting base, on which a support frame is arranged, and the ventilation secondary duct is sleeved with a plurality of buffer rings abutting against the secondary duct, and the buffer rings are slidably arranged on the support frame.

7. A large ventilation volume multi-stage ventilation device for mines according to claim 6, It is characterized in that The secondary ventilation duct is a corrugated pipe.

8. A large ventilation volume multi-stage ventilation device for mines according to claim 6, It is characterized in that A buffer spring abutting against the outer wall of the secondary ventilation duct is provided on the inner wall of the buffer ring.

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