A mine air duct

Abstract

The application discloses a kind of coal mine with air duct for underground dust removal ventilation device technical field, including air duct;Negative pressure airflow generating unit;Two baffles, by installing same pivot rotation connection in air duct, and two baffles are rotated to horizontal state after being rotated upwards around pivot, can close air duct;Elastic drive unit, for when airflow pressure in air duct is less than preset value, two baffles are driven to overturn to horizontal state.By setting two baffles and elastic drive unit, when negative pressure airflow generating unit generates negative pressure airflow inside air duct, two baffles will be overturned downwards, so that dust can enter air duct from the gap between two baffles and air duct inner wall, to complete dust removal, when negative pressure airflow generating unit stops operation, when the elastic resistance force of elastic drive unit that two baffles suffer is greater than the force of negative pressure airflow, two baffles will be overturned upwards, so that air duct inside is closed by two baffles, avoid dust, dust backflow in air duct.

Description

Technical Field

[0001] This invention relates to the technical field of underground dust removal and ventilation devices, specifically a ventilation duct for coal mines. Background Technology

[0002] When working underground in a mine, ventilation and dust removal are generally carried out at the tunneling face, mainly relying on negative pressure ventilation ducts to remove dust. A search of Chinese patent number CN210714759U discloses a negative pressure ventilation duct with a self-starting ventilation function, comprising a negative pressure ventilation duct, an auxiliary ventilation structure and a fixed installation structure inside the negative pressure ventilation duct; the auxiliary ventilation structure mainly includes: a first annular frame, a support frame and a fan; the first annular frame is placed on the inner wall of the negative pressure ventilation duct, and a pair of strip plates are installed on the first annular frame. Each strip plate has a strip-shaped slot on its upper wall, and a first slider is installed in each strip slot. Each first slider is equipped with a support seat.

[0003] In existing technology, when the air duct is working, the negative pressure airflow is provided by the fan motor. During the process from when the fan motor stops until the fan blades on it completely stop rotating, the fan blades of the fan motor will still generate a negative pressure airflow for a period of time due to inertia. This causes a small amount of dust to be discharged into the air duct and the pipes adjacent to the air duct. As a result, after the fan motor completely stops, this dust or powder will have a backflow phenomenon, which affects the dust and powder discharge efficiency.

[0004] Based on this, the present invention designs a ventilation duct for coal mines to solve the above problems. Summary of the Invention

[0005] To address the existing problems, this invention provides a ventilation duct for coal mines, effectively solving the problems mentioned in the background art.

[0006] To solve the above problems, the present invention adopts the following technical solution: a ventilation duct for coal mines, comprising:

[0007] The ventilation duct has open ends;

[0008] A negative pressure airflow generating unit is installed inside the air duct and is used to generate negative pressure airflow inside the air duct.

[0009] Two baffles are rotatably connected inside the air duct by means of the same pivot, and the air duct can be closed after the two baffles are rotated upward about the pivot to a horizontal state;

[0010] The elastic drive unit is used to drive the two baffles to flip to a horizontal state when the airflow pressure inside the duct is less than a preset value.

[0011] In the coal mine ventilation duct described above, the negative pressure airflow generating unit includes:

[0012] A perforated bracket is installed inside the air duct.

[0013] The fan motor is mounted on the hollow bracket.

[0014] In the coal mine ventilation duct described above, the elastic drive unit includes:

[0015] A fixing plate is detachably connected to the inner wall of the air duct and is located below the baffle.

[0016] The fixed column is vertically fixed to the fixed plate;

[0017] A floating ring is fitted onto the fixed post and can slide freely up and down.

[0018] Two hinge rods are respectively hinged to opposite sides of the floating ring in the radial direction, and the upper ends of the two hinge rods are respectively hinged to the two baffles.

[0019] A spring is wound around the fixed post, and the two ends of the spring elastically abut against the floating ring and the fixed plate respectively in the direction of the spring force.

[0020] In the coal mine ventilation duct described above, a limiting pin is horizontally inserted through the floating ring, and a waist-shaped groove for the limiting pin to be inserted is provided on the outer wall of the fixed column, the length direction of the waist-shaped groove being parallel to the axial direction of the fixed column.

[0021] In the coal mine ventilation duct described above, one end of the ventilation duct corresponding to the baffle is provided with an annular cavity formed by rotating around its own axis. Multiple spray holes communicating with the annular cavity are opened on the inner wall of the ventilation duct. An interface is provided on the outer wall of the ventilation duct, and a connecting hole communicating with the annular cavity is opened in the interface.

[0022] In a coal mine ventilation duct as described above, a sliding column is horizontally inserted through the inner wall of the ventilation duct. The outer diameter of the sliding column is adapted to the diameter of the connecting hole. A fixing ring is fitted onto one end of the sliding column facing the inner side of the ventilation duct. A tension spring is wound around the sliding column. The two ends of the tension spring are respectively welded to the fixing ring and the inner wall of the ventilation duct. In its natural state, the tension spring exerts a pulling force on the fixing ring, causing the other end of the sliding column to pass into the connecting hole, thereby sealing the opening of the connecting hole. A roller is rotatably connected to the sliding column. The roller makes rolling contact with the downward-facing side of one of the baffles. The interface is also provided with a transition cavity that communicates with the annular cavity and the connecting hole. The diameter of the transition cavity is larger than the diameter of the connecting hole.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: By setting two baffles and an elastic drive unit, when the negative pressure airflow generating unit generates negative pressure airflow inside the air duct, the two baffles will flip downwards, allowing dust to enter the air duct through the gap between the two baffles and the inner wall of the air duct, thereby completing dust removal. When the negative pressure airflow generating unit stops operating, when the elastic resistance force of the elastic drive unit on the two baffles is greater than the force of the negative pressure airflow, the two baffles will flip upwards, so that the inside of the air duct is sealed by the two baffles, preventing dust and particulate matter from flowing back into the air duct. By setting an annular cavity, spray holes, and an interface, an external water pump is connected to the interface through a pipeline, enabling water to be delivered to the annular cavity and then sprayed into the air duct through the spray holes, thereby achieving dust reduction and wetting of dust. After the baffles flip downwards, they can generate a thrust on the rollers, thereby causing the sliding column to disengage from the insertion state of the connecting hole, allowing water to enter the annular cavity through the interface. This achieves automatic spraying and dust reduction inside the air duct after the baffles close and flip. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the assembly structure of the present invention;

[0025] Figure 2 for Figure 1 Enlarged schematic diagram of the local structure at point A;

[0026] Figure 3 for Figure 1 An enlarged schematic diagram of the local structure at point B.

[0027] The attached diagram lists the components represented by each number as follows:

[0028] 1-Air duct, 2-Spray hole, 3-Annular cavity, 4-Baffle, 5-Pivot, 6-Hinge rod, 7-Fixing plate, 8-Roller, 9-Sliding column, 10-Interface, 11-Fan motor, 12-Hollow bracket, 13-Floating ring, 14-Spring, 15-Limit pin, 16-Oval groove, 17-Fixing column, 18-Fixing ring, 19-Tension spring, 20-Transition cavity, 21-Connecting hole. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] like Figure 1-3As shown, this embodiment provides a ventilation duct for coal mines, including a ventilation duct 1, a negative pressure airflow generating unit, two baffles 4, and an elastic drive unit. The ventilation duct 1 is open at both ends and has a columnar outer contour. The negative pressure airflow generating unit is installed inside the ventilation duct 1 and is used to generate negative pressure airflow inside the ventilation duct 1. The two baffles 4 are rotatably connected inside the ventilation duct 1 by installing the same pivot 5. After the two baffles 4 rotate upward around the pivot 5 to a horizontal state, they can close the ventilation duct 1. The elastic drive unit is used to drive the two baffles 4 to flip to a horizontal state when the airflow pressure inside the ventilation duct 1 is less than a preset value.

[0031] When performing dust removal and ventilation in underground coal mines, a dust discharge pipe is installed at the end of the ventilation duct 1 furthest from the baffle 4. When the negative pressure airflow generating unit is normally activated, the negative pressure airflow pressure generated is slightly greater than the elastic resistance force of the elastic drive unit against the baffle 4. Thus, during dust removal, the negative pressure airflow generated by the negative pressure airflow generating unit causes the two baffles 4 to rotate downwards around the pivot 5, creating a gap between the baffles 4 and the inner wall of the ventilation duct 1 for dust and airflow to pass through. This allows the negative pressure airflow generating unit to ventilate the underground coal mine through the ventilation duct 1. When the dust removal is completed, the negative pressure airflow generating unit stops, and the negative pressure airflow pressure drops and becomes less than the elastic resistance of the elastic drive unit against the baffle 4. At this time, the elastic drive unit drives the two baffles 4 to flip upward until they are in a horizontal state, which can seal the inside of the air duct 1. This blocks the dust that is brought into the air duct or dust removal pipeline by the inertia of the negative pressure airflow generating unit when it stops, preventing the dust from flowing back from the opening of the air duct 1. The whole process does not require manual operation and has a high degree of automation.

[0032] The negative pressure airflow generating unit in this embodiment includes a hollow bracket 12 and a fan motor 11. The hollow bracket 12 is installed inside the air duct 1, and the fan motor 11 is installed on the hollow bracket 12.

[0033] The perforated support 12 has multiple perforated slots to facilitate air circulation. The fan motor 11 is installed in the middle of the perforated support 12 and is powered by an external power module. When dust removal is needed in the coal mine, the fan motor 11 is started first. When the fan motor 11 rotates at high speed, it generates a downward airflow (see reference). Figure 1 The airflow drives the baffle 4, causing the two baffles to flip downwards.

[0034] The elastic drive unit in this embodiment includes a fixed plate 7, a fixed column 17, a floating ring 13, two hinge rods 6, and a spring 14. The fixed plate 7 is connected to the inner wall of the air duct 1 by screws and is located below the baffle 4. The fixed column 17 is vertically fixed to the fixed plate 7. The floating ring 13 is fitted on the fixed column 17 and can slide freely up and down. The two hinge rods 6 are respectively hinged to opposite sides of the floating ring 13 in the radial direction, and the upper ends of the two hinge rods 6 are correspondingly hinged to the two baffles 4. The spring 14 is wrapped around the fixed column 17, and the two ends of the spring force direction elastically abut against the floating ring 13 and the fixed plate 7 respectively.

[0035] As mentioned earlier, when the negative pressure airflow generating unit is started, the two baffles 4 are driven by the negative pressure airflow and thus rotate downward around the pivot 5. During this process, the downward rotation of the baffles 4 will drive the hinge rod 6 to move downward. During the movement, they can jointly drive the floating ring 13 to slide downward and compress the spring 14. When the negative pressure airflow generating unit stops, the elastic potential energy of the spring 14 is released, and it can then change from a compressed state to an extended state, driving the floating ring 13 to slide upward. This causes the two baffles 4 to rotate in opposite directions to a horizontal state, and the gap between the two baffles 4 and the inner wall of the air duct 1 disappears. This can seal the inside of the air duct 1 to prevent dust or particulate matter from flowing back.

[0036] In this embodiment, a limiting pin 15 is horizontally inserted on the floating ring 13, and a waist-shaped groove 16 is provided on the outer wall of the fixed column 17 for the limiting pin 15 to be inserted. The length direction of the waist-shaped groove 16 is parallel to the axial direction of the fixed column 17.

[0037] The floating ring 13 is prevented from detaching from the fixed post 17 by sliding and limiting the pin 15 within the waist-shaped groove 16.

[0038] In this embodiment, the air duct 1 has an annular cavity 3 formed by rotating around its own axis at one end corresponding to the baffle 4. The inner wall of the air duct 1 has a plurality of spray holes 2 that communicate with the annular cavity 3. The outer wall of the air duct 1 has an interface 10, and the interface 10 has a connecting hole 21 that communicates with the annular cavity 3.

[0039] An external water pump is connected to interface 10 through a pipeline. When the water pump is started, it can transport water from the external water storage device to the annular cavity 3 through interface 10, and then spray it onto the inside of the air duct 1 through the spray hole 2 to suppress and moisten the dust or particulate matter entering the air duct 1.

[0040] In this embodiment, a sliding column 9 is horizontally inserted through the inner wall of the air duct 1. The outer diameter of the sliding column 9 is adapted to the diameter of the connecting hole 21. A fixing ring 18 is fitted onto one end of the sliding column 9 facing the inner side of the air duct 1. A tension spring 19 is wound around the sliding column 9. The two ends of the tension spring 19 are welded to the fixing ring 18 and the inner wall of the air duct 1, respectively. In its natural state, the tension spring 19 exerts a pulling force on the fixing ring 18, causing the other end of the sliding column 9 to pass into the connecting hole 21, thereby sealing the opening of the connecting hole 21. A roller 8 is rotatably connected to the sliding column 9. The roller 8 rolls in contact with the downward-facing side of one of the baffles 4. The interface 10 is also provided with a transition cavity 20 that communicates with the annular cavity 3 and the connecting hole 21. The diameter of the transition cavity 20 is larger than the diameter of the connecting hole 21.

[0041] When the baffle flips downwards, the downward-facing side of the baffle contacts the roller and exerts a pushing force on the roller, causing the sliding column to move away from the connecting hole. This connects the interface, transition chamber, and annular cavity, allowing the water pumped by the pump to be delivered into the annular cavity, thus achieving spraying. When the baffle flips upwards, the tension spring exerts a pulling force on the fixed ring, causing the sliding column to insert into the connecting hole and preventing water from the pump from entering the annular cavity. This achieves automatic control of the spraying operation without human intervention.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mine air duct, characterized by, The utility model provides a kind of negative pressure air flow generation device, including: Wind tube (1), two ends are open; Negative pressure air flow generation unit, install in the wind tube (1), and for the wind tube (1) inside generation negative pressure air flow; Two baffle (4), by installing the same pivot (5) rotation connection in the wind tube (1), and two the baffle (4) rotates to horizontal state after around the pivot (5) upwards, can close the wind tube (1); Elastic drive unit, for when the air flow pressure in the wind tube (1) is less than preset value, drive two the baffle (4) overturn to horizontal state; The sliding column (9) is horizontally provided on the inner wall of the wind tube (1), the outer diameter of the sliding column (9) is matched with the hole diameter of the communication hole (21), one end of the sliding column (9) towards the inside of the wind tube (1) is sleeved with a fixed ring (18), the tension spring (19) is sleeved around the sliding column (9), the two ends of the tension spring (19) are welded on the fixed ring (18) and the inner wall of the wind tube (1) respectively, and in the natural state, the tension spring (19) generates tension on the fixed ring (18), so that the other end of the sliding column (9) penetrates into the communication hole (21), thereby closing the mouth of the communication hole (21), the rolling wheel (8) is rotatably connected to the sliding column (9), the rolling wheel (8) is in rolling contact with the downward side of one of the baffles (4), an interface (10) is provided on the outer wall of the wind tube (1), the transition cavity (20) is further provided in the interface (10) and is in communication with the annular cavity (3) and the communication hole (21), and the hole diameter of the transition cavity (20) is greater than the hole diameter of the communication hole (21).

2. A mine air duct according to claim 1, characterised in that The negative pressure air flow generation unit comprises: Hollow support (12), install in the wind tube (1); Fan motor (11), install on the hollow support (12).

3. A mine air duct according to claim 1, characterised in that The elastic drive unit comprises: Fixed plate (7), detachably connected to the inner wall of the wind tube (1), and located below the baffle (4); Fixed column (17), vertically fixed to the fixed plate (7); Floating ring (13), sleeved on the fixed column (17) and freely slidable up and down; Two hinge rods (6), respectively hinged on the opposite sides of the radial direction of the floating ring (13), and the upper ends of the two hinge rods (6) are correspondingly hinged to the two baffles (4); Spring (14), sleeved around the fixed column (17), and the elastic force directions of the two ends of the spring (14) are respectively elastically abutted against the floating ring (13) and the fixed plate (7).

4. A mine air duct according to claim 3, characterised in that The limiting pin (15) is horizontally provided on the floating ring (13), the waist-shaped groove (16) is formed on the outer wall of the fixed column (17) and is inserted by the limiting pin (15), and the length direction of the waist-shaped groove (16) is parallel to the axial direction of the fixed column (17).

5. The air duct for coal mine according to claim 1, characterized in that, One end of the wind tube (1) corresponding to the baffle (4) is provided with an annular cavity (3) which rotates around its own axial direction, a plurality of spray holes (2) are formed in the inner wall of the wind tube (1) and penetrate the annular cavity (3), and a communication hole (21) is formed in the interface (10) and penetrates the annular cavity (3).

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