A mine air cutting device

Abstract

The utility model relates to coal mine ventilation equipment technical field provides a mine air cutting device, including roadway joint, Y type tee bend, hanging net disc valve, spare disc valve, T type tee bend, circular diffuser and circular diffusion tower, dustproof subassembly is installed in roadway joint, dustproof subassembly includes annular mounting seat and the spiral blade fixed in its inner wall, annular mounting seat side wall is provided with dust leakage hole, and the rotating component is communicated in the bottom of roadway joint, and the rotating component includes dust collection groove and is used for controlling the rotating plate of dust removal, and the side wall of T type tee bend is equipped with the air door to empty, and the Y type tee bend waist part prongs the air outlet and embeds hanging net disc valve, the utility model discloses through spiral blade produces cyclone centrifugal force separation dust, utilizes the rotating plate and realizes on -line dust removal of non -stop, solves the problem of dust accumulation abrasion equipment, utilizes the air door to empty cooperation multistage disc valve balance airflow fluctuation when switching simultaneously, realizes the smooth machine of fan, guarantees the safe and stable operation of mine ventilation system.

Description

Technical Field

[0001] This utility model relates to the field of coal mine ventilation equipment technology, and in particular to a mine air cutting device. Background Technology

[0002] In underground ventilation systems in coal mines, the main ventilation fan is the core equipment for ensuring safe production. To ensure the continuity and reliability of ventilation, it is usually necessary to equip the system with two sets of main and backup fans and to switch them regularly. However, the existing fan switching devices have a relatively simple structure. During the switching process, the conflict between valve action and airflow inertia often causes violent fluctuations in the air pressure in the pipeline network. This can easily lead to fan surge and, in severe cases, even cause turbulent airflow underground, affecting safe production.

[0003] In addition, the air discharged from underground mines usually contains a large amount of coal dust particles. Existing air cutting devices lack an effective pre-dust removal structure at the air inlet, causing dust-laden airflow to directly enter the subsequent switching valves and blowers. Over time, dust easily accumulates at valve seals, blower blades, and pipe bends. This not only increases airflow resistance but also accelerates equipment wear and corrosion. Furthermore, existing devices usually do not have a dedicated dust removal mechanism at the bottom. Cleaning accumulated dust often requires stopping the machine and disassembling the pipes, resulting in a large workload and low efficiency, which is difficult to meet the needs of modern mines for efficient and continuous production.

[0004] Therefore, this utility model proposes a mining air cutting device to overcome the shortcomings of the prior art. Utility Model Content

[0005] In view of the problems existing in the mining air cutting device, such as the lack of effective pre-dust removal means that dust easily accumulates inside the equipment and wears it down, the lack of online dust removal structure that makes cleaning and maintenance difficult, and large airflow fluctuations during fan switching that cause system instability, this utility model aims to provide a mining air cutting device with an improved structure that can effectively solve the above problems.

[0006] This utility model provides a mine ventilation cutting device, including: a roadway connector, a Y-type tee connected to the air outlet of the roadway connector, a hanging mesh disc valve connected to the two branch air outlets of the Y-type tee respectively, a spare disc valve and a T-type tee connected in sequence to the rear end of the hanging mesh disc valve, and a circular diffuser and a circular diffuser tower connected in sequence to the end of the T-type tee.

[0007] The mesh-mounted disc valve is directly embedded in the waist-shaped channel of the Y-type tee and adapted to the cross-section of the waist-shaped channel. A spare disc valve is configured in parallel at the rear end of the mesh-mounted disc valve, forming a dual-valve channel for the main valve and the spare valve to work together. In conjunction with the air damper, it introduces the pressure difference in the external air balance pipe during the reversing transition, avoiding the surge of the fan caused by airflow fluctuations. The spare disc valve can seamlessly take over when the mesh-mounted disc valve fails, ensuring that the reversing passage is not interrupted. The disc valve embedded in the waist of the Y-type tee, together with the non-stop reversing structure, minimizes the disturbance of the airflow by the valve body and reduces local wind resistance, realizing a smooth and uninterrupted switching of the main and spare fans, ensuring the safety and continuity of the underground ventilation system.

[0008] The tunnel joint is equipped with a dustproof component, which has a swirling separation structure that differs from conventional pipelines. The dustproof component includes an annular mounting seat coaxially fixed inside the tunnel joint. The inner wall of the annular mounting seat is fixed with axially extending spiral blades. Multiple dust leakage holes are also opened through the side wall of the annular mounting seat. The bottom wall of the tunnel joint is connected to a rotating component, which includes a dust collection groove fixed to the bottom of the tunnel joint and a rotating plate rotatably installed inside the dust collection groove.

[0009] Furthermore, the tunnel joint, the dustproof component, and the rotating component are combined in a specific positional relationship. The annular mounting base guides the airflow to rotate through the spiral blades on its inner wall, using centrifugal force to throw the dust to the outer wall and discharge it through the dust leakage hole. The top opening of the dust collection trough is directly aligned with the dust collection area below the dust leakage hole, so that the separated dust can be collected in the dust collection trough and the dust can be discharged online through the flipping action of the rotating plate.

[0010] Preferably, the inner wall of the tunnel joint is circumferentially fixed with multiple support seats. The support seats are used to stably support the dustproof components and create a dust collection space. The outer wall of the annular mounting seat away from the air inlet is tightly abutted against the inner arc surface of the support seat, thereby forming an annular dust collection chamber between the outer wall of the annular mounting seat and the inner wall of the tunnel joint. The dust leakage hole is directly connected to the dust collection chamber to ensure that dust can smoothly enter the collection area.

[0011] Preferably, the connection between the tunnel joint and the annular mounting base adopts a convenient flange structure. The air inlet end face of the tunnel joint is welded and fixed with a first flange, while the outer edge of the air inlet end of the annular mounting base is integrally formed with a second flange. The second flange and the first flange are fastened together by bolts. This design facilitates the quick installation, disassembly and maintenance of the dustproof components.

[0012] Preferably, the rotating assembly further includes a connecting pipe and a rotating shaft. The connecting pipe is fixedly inserted into the side wall of the dust collection tank and communicates with its interior. The rotating shaft is rotatably inserted into the connecting pipe, and one end of the rotating shaft located in the dust collection tank is fixedly connected to the rotating plate. This structure realizes the function of controlling the opening and closing of the internal rotating plate by operating the rotating shaft externally.

[0013] Preferably, the rotating assembly is also equipped with a locking mechanism to prevent malfunction. The end of the connecting pipe located outside the dust collection tank has an external thread and is threadedly connected to a locking ring. The locking ring locks and fixes the rotating shaft at a specific angle by the axial extrusion force when tightened, ensuring the sealing of the rotating plate in the non-dust discharge state.

[0014] Preferably, the T-shaped tee has an air inlet on the side wall of the pipe between the spare disc valve and the circular diffuser. The air inlet is movably connected to an air damper via a hinge. This air damper is used to introduce outside air during the transition phase of fan switching to balance the pressure difference inside and outside the pipe and prevent surge.

[0015] Preferably, the two branch channels of the Y-type tee are designed as streamlined waist-shaped structures, and the hanging mesh disc valve adopts a waist-shaped profile and is embedded in the waist-shaped channel of the Y-type tee. This shape design helps to reduce the local resistance of airflow at the branch point and improve the flow efficiency.

[0016] Preferably, the circular diffusion tower is composed of multiple oblique truncated cones with diameters gradually increasing along the air outlet direction. The end faces of adjacent oblique truncated cones are fixedly connected by circular flanges. This segmented, gradually expanding structure not only facilitates transportation and assembly but also effectively reduces exhaust noise and dynamic pressure loss.

[0017] This utility model has the following beneficial effects: 1. This utility model solves the problem of dusty airflow accumulating in pipes and fans in existing mine ventilation systems and lacking efficient online cleaning methods by setting an annular mounting base with spiral blades and dust leakage holes inside the roadway joint, and setting a dust collection trough and rotating plate dust removal mechanism at the bottom. It achieves the effect of automatically separating dust by using swirling centrifugal force, and realizes online dust removal without stopping the machine through the rotating plate, effectively reducing the wear of dust on the blades of subsequent fans, extending the service life of equipment, and reducing the frequency of manual cleaning and maintenance.

[0018] 2. This utility model solves the problems of large air pressure fluctuations, air surges, and unstable mine ventilation caused by instantaneous changes in airflow during the switching process of main and backup mine fans by setting an openable air damper on the side wall of the T-shaped tee, combined with the pipeline layout of the Y-shaped tee and multi-stage butterfly valve. It achieves the effect of introducing external air to balance the pressure difference and maintain the stability of the total air volume during the switching transition period, realizing a smooth and seamless switching of the fans and ensuring the safety of underground operations.

[0019] 3. This utility model solves the problems of high airflow resistance at the branching point of traditional pipelines and system shutdown caused by single valve failure by designing the branching channel of the Y-type tee as a streamlined waist-shaped structure and combining it with an embedded hanging mesh disc valve, as well as setting a spare disc valve at the rear end. It achieves the effect of reducing local wind resistance and reducing energy consumption. At the same time, the dual-valve redundancy design ensures that the system can still operate normally through the spare valve when one valve fails or is under maintenance, thus improving the reliability of the ventilation system. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of a mining air cutting device proposed in this utility model; Figure 2 This is a schematic diagram of the Y-type tee section of a mining air cutting device proposed in this utility model; Figure 3 This is a schematic diagram of the roadway joint structure of a mining ventilation cutting device proposed in this utility model. Figure 4 This is a schematic diagram of the rotating plate section of a mining air cutting device proposed in this utility model; Figure 5 This is a schematic diagram of the hanging mesh disc valve part of a mining air cutting device proposed in this utility model.

[0021] Legend: 1. Tunnel joint; 2. Y-type tee; 3. Net-mounted butterfly valve; 4. Spare butterfly valve; 5. T-type tee; 6. Air damper; 7. Circular diffuser; 8. Circular diffuser tower; 9. Dustproof assembly; 901. Annular mounting base; 902. Support base; 903. First flange; 904. Dust leakage hole; 905. Second flange; 906. Spiral blade; 10. Rotating assembly; 101. Dust collection trough; 102. Rotating plate; 103. Rotating shaft; 104. Connecting pipe; 105. Locking ring. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please refer to Figures 1 to 5 This utility model provides a mine ventilation device, which aims to solve the defects of existing mine ventilation systems, such as large airflow fluctuations during fan switching, inability to maintain air pressure balance, and the lack of efficient online dust removal and exhaust structures for dusty airflow in underground pipes and fans.

[0024] like Figure 1 and Figure 2 As shown, the main structure of the mine ventilation device includes a roadway connector 1, which serves as the overall air intake channel, and a Y-type tee 2 fixedly connected to the air outlet of the roadway connector 1. The roadway connector 1 is used to connect to the mine shaft opening size and introduce the main airflow underground. The Y-type tee 2 serves to divert and guide the single main airflow to the subsequent dual channels. The two branch outlets of the Y-type tee 2 are respectively fixedly connected to a mesh disc valve 3. The mesh disc valve 3 is embedded in the branch channel of the Y-type tee 2 as the main control valve to control the opening and closing of the passage. The end of the mesh disc valve 3 away from the Y-type tee 2 is sequentially and fixedly connected to a spare disc valve 4 and a T-type tee 5 through a flange. The spare disc valve 4 is put into use when the mesh disc valve 3 fails or is under maintenance to ensure that the system switching is uninterrupted. The end of the T-type tee 5 away from the spare disc valve 4 is sequentially and coaxially fixedly connected to a circular diffuser 7 and a circular diffusion tower 8. The circular diffuser 7 and the circular diffusion tower 8 work together to decelerate and diffuse the high-speed airflow after it has been driven by the fan.

[0025] The mine air-cutting device also includes a specially designed dustproof component 9 and a cooperating rotating component 10. The dustproof component 9 and the roadway joint 1 form an embedded vortex separation structure, while the rotating component 10 provides a convenient online dust removal method. The dustproof component 9 has an annular mounting seat 901 coaxially inserted inside the roadway joint 1. The annular mounting seat 901 has a cylindrical structure, and spiral blades 906 are fixedly installed on the inner wall surface of the annular mounting seat 901. The spiral blades 906 extend spirally along the axial direction, forcing the airflow through the roadway joint 1 to generate a strong rotational motion. The centrifugal force generated by the rotation throws denser coal dust particles in the airflow towards the outer wall. Multiple dust leakage holes 904 are evenly distributed throughout the side wall of the annular mounting seat 901. These dust leakage holes 904 form a channel for dust to escape from the main airflow. To ensure stable installation of the annular mounting seat 901... The mounting base 901 forms the necessary dust collection space. Four arc-shaped support seats 902 are welded and fixed to the inner wall of the tunnel joint 1. The outer wall of the annular mounting base 901 away from the air inlet is tightly abutted against the inner arc surface of the support seat 902, thereby constructing an annular dust collection chamber between the outer wall of the annular mounting base 901 and the inner wall of the tunnel joint 1. The dust leakage hole 904 is directly connected to the dust collection chamber, so that the separated dust can settle to the bottom of the dust collection chamber under the action of gravity. In addition, a first flange 903 is welded to the air inlet end face of the tunnel joint 1, and a second flange 905 is integrally formed on the outer edge of the air inlet end of the annular mounting base 901. During installation, the annular mounting base 901 is simply pushed into the tunnel joint 1 until it abuts against the support seat 902, and the second flange 905 is fastened to the first flange 903 with bolts to complete the assembly and fixation of the dustproof component 9.

[0026] Please refer to further details. Figure 4 To discharge the dust collected in the dust collection chamber, a rotating assembly 10 is connected to the bottom of the tunnel joint 1. The rotating assembly 10 consists of a dust collection trough 101, which is fixedly welded to the bottom wall of the tunnel joint 1 with its top opening directly aligned with the lowest point of the dust collection chamber. A connecting pipe 104 is fixedly inserted into the side wall of the dust collection trough 101. A rotating shaft 103 rotatably passes through the connecting pipe 104. A rotating plate 102 is fixedly connected to one end of the rotating shaft 103 extending into the dust collection trough 101. The size of the rotating plate 102 is adapted to the inner cross-section of the dust collection trough 101. The rotating plate 102 is rotated to allow for the discharge of dust collected in the dust collection trough 101. The rotating shaft 103 drives the rotating plate 102 to rotate, which can open and close the bottom of the dust collection tank 101, thereby controlling the discharge of accumulated dust. In order to prevent the rotating plate 102 from rotating unexpectedly under the negative pressure of airflow or vibration, the connecting pipe 104 has an external thread on one end surface outside the dust collection tank 101, and a locking ring 105 is threaded to this end. The locking ring 105 squeezes the end structure of the rotating shaft 103 or the connecting pipe 104 by tightening, thereby locking the rotating shaft 103 at the current angle and ensuring that the rotating plate 102 remains in a horizontal closed state during non-dust discharge operations.

[0027] Based on the above embodiments, the present invention may further include the following preferred technical solutions: As a preferred embodiment, to avoid excessive negative pressure or airflow surge within the duct during fan switching, please refer to... Figure 1 and Figure 5 A rectangular air inlet is provided on the side wall of the pipe body between the standby disc valve 4 and the circular diffuser 7 in the T-type tee 5. An air damper 6 is installed at the air inlet. The air damper 6 is movably connected to the side wall of the T-type tee 5 by a hinge. During normal operation, the air damper 6 is kept closed to maintain the airtightness of the pipe. During the transition phase of switching between the main and standby fans, the air damper 6 can be opened to introduce external air to supplement the flow, thereby balancing the air pressure fluctuations in the system and ensuring a smooth transition during the switching process.

[0028] As another preferred embodiment, in order to reduce airflow resistance and optimize the flow guiding effect, the two bifurcated channels of the Y-type tee 2 are designed as streamlined waist-shaped structures. The mesh disc valve 3 is correspondingly designed with a shape that matches the cross-section of the waist-shaped channel and is embedded in the waist-shaped channel of the Y-type tee 2. This design reduces the disturbance of the airflow to the protruding structure of the valve body, and also makes the structure of the entire bifurcated part more compact.

[0029] As another preferred embodiment, in order to improve exhaust efficiency and reduce outlet noise, the circular diffuser tower 8 adopts a segmented diffusion design, specifically composed of multiple sloping truncated cones with diameters gradually increasing along the airflow direction. This gradually expanding structure can effectively convert the kinetic energy of high-speed airflow into static pressure energy and reduce the turbulence intensity at the exhaust outlet. Circular flanges are welded to the end faces of adjacent sloping truncated cones, and the flanges are bolted together to achieve rigid fixation between the segments.

[0030] The working principle of this utility model's mining air cutting device is as follows: When the mine ventilation system is started, the main airflow containing coal dust in the mine first enters the roadway joint 1. When the airflow passes through the internal dustproof component 9, the fixed spiral blades 906 force the originally straight-flowing airflow to change into a high-speed spiral motion. Under the action of centrifugal force, the denser dust particles in the airflow are thrown towards the inner wall of the annular mounting base 901 and are thrown out through the dust leakage hole 904 on the side wall into the dust collection chamber between the annular mounting base 901 and the inner wall of the roadway joint 1. The separated dust slides down the dust collection chamber under the influence of gravity and collects in the dust collection trough 101 at the bottom. The airflow that has been preliminarily purified continues to flow forward into the Y-type tee 2.

[0031] After the airflow enters the Y-type tee 2, it is diverted and guided to the branch channel that is currently in operation. At this time, the mesh disc valve 3 in the channel is in the open state. If the fan switching operation is required, the operator first opens the air damper 6 located on the side wall of the T-type tee 5 to introduce fresh outside air into the pipeline to supplement the flow and balance the air pressure, so as to avoid violent fluctuations in the airflow in the pipe due to the start and stop of the fan. Then, the mesh disc valve 3 or the standby disc valve 4 on the branch at both ends of the Y-type tee 2 are adjusted synchronously and gradually to slowly close the operating side channel and open the standby side channel, so that the downhole airflow is smoothly transferred to the standby fan pipeline. Finally, the airflow merges into the T-type tee 5 and flows through the circular diffuser 7 and the circular diffuser tower 8. The high kinetic energy of the airflow is converted into static pressure energy by the gradually expanding flow channel cross section, and then discharged into the atmosphere with low noise and high efficiency.

[0032] When the dust accumulated inside the dust collection tank 101 needs to be cleaned, online dust removal can be performed without stopping the machine. The operator first loosens the locking ring 105 at the end of the connecting pipe 104 to release its compression and locking state on the rotating shaft 103. Then, the rotating shaft 103 is rotated to drive the rotating plate 102 inside the dust collection tank 101 to flip downward and open. The accumulated dust is then discharged under the action of gravity. After the dust removal is completed, the rotating shaft 103 is rotated in the opposite direction to reset the rotating plate 102 to a horizontal closed state. The locking ring 105 is then tightened again to fix the rotating shaft 103, thereby ensuring the sealing of the device during subsequent operation.

[0033] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A mine ventilation device, comprising a roadway connector (1) and a Y-type tee (2) connected to the air outlet end of the roadway connector (1), characterized in that, The two branch outlets of the Y-type tee (2) are respectively connected to the hanging mesh disc valve (3). The end of the hanging mesh disc valve (3) away from the Y-type tee (2) is connected to the spare disc valve (4) and the T-type tee (5) in sequence. The end of the T-type tee (5) away from the spare disc valve (4) is connected to the circular diffuser (7) and the circular diffuser tower (8) in sequence. The inner wall of the tunnel joint (1) is equipped with a dustproof component (9). The dustproof component (9) includes an annular mounting seat (901) coaxially fixed inside the tunnel joint (1). The inner wall of the annular mounting seat (901) is fixed with a spiral blade (906). The side wall of the annular mounting seat (901) is provided with multiple dust leakage holes (904). The bottom wall of the tunnel joint (1) is connected to a rotating component (10). The rotating component (10) includes a dust collection groove (101) fixed to the bottom of the tunnel joint (1). The top opening of the dust collection groove (101) is connected to the inside of the tunnel joint (1) and is located below the dust leakage holes (904). The inside of the dust collection groove (101) is rotatably connected with a rotating plate (102).

2. The mining ventilation cutting device according to claim 1, characterized in that, The inner wall of the tunnel joint (1) is fixed with a plurality of support seats (902). The outer wall of the annular mounting seat (901) away from the air inlet abuts against the inner arc surface of the support seat (902). A dust collection chamber is formed between the outer wall of the annular mounting seat (901) and the inner wall of the tunnel joint (1). The dust leakage hole (904) is connected to the dust collection chamber.

3. A mining ventilation cutting device according to claim 2, characterized in that, The air inlet end face of the tunnel joint (1) is fixed with a first flange (903), and the outer edge of the air inlet end of the annular mounting seat (901) is integrally fixed with a second flange (905). The second flange (905) and the first flange (903) are fixedly connected by bolts.

4. A mining ventilation cutting device according to claim 1, characterized in that, The rotating assembly (10) further includes a connecting pipe (104) and a rotating shaft (103). The connecting pipe (104) is fixedly inserted into the side wall of the dust collection tank (101) and communicates with the inside of the dust collection tank (101). The rotating shaft (103) is rotatably inserted into the connecting pipe (104), and one end of the rotating shaft (103) located in the dust collection tank (101) is fixedly connected to the rotating plate (102).

5. A mining ventilation cutting device according to claim 4, characterized in that, The rotating assembly (10) also includes a locking ring (105). The connecting pipe (104) has an external thread at one end outside the dust collection groove (101). The locking ring (105) is threaded to the outer end of the connecting pipe (104) and locks the rotating shaft (103) by compression.

6. A mining ventilation cutting device according to claim 1, characterized in that, The T-shaped tee (5) is located on the side wall of the pipe between the spare disc valve (4) and the circular diffuser (7) and has an air supply port. The air supply port is connected to an air damper (6) by a hinge.

7. A mining ventilation cutting device according to claim 1, characterized in that, The two branch channels of the Y-type tee (2) are both waist-shaped, and the hanging mesh disc valve (3) is embedded in the waist-shaped channel of the Y-type tee (2).

8. A mining ventilation cutting device according to claim 1, characterized in that, The circular diffusion tower (8) is composed of multiple oblique truncated cones with gradually increasing diameters, and the end faces of adjacent oblique truncated cones are fixedly connected by circular flanges.

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