Partitioned ventilation device for driving working face and partitioned ventilation method of partitioned ventilation device

Abstract

The invention discloses a tunneling working face partition ventilation device and a partition ventilation method thereof, and belongs to the technical field of underground tunneling engineering.The tunneling working face partition ventilation device comprises a tunneling machine body, an air inducing system and an air distributing system are arranged on the tunneling machine body, the air inducing system comprises a roadway air duct, the roadway air duct is connected with a telescopic air duct, and the telescopic air duct is connected with the tunneling machine body. The telescopic air duct is connected with the connecting hose; the air distribution system comprises an air flow tee joint and an air distribution box, one end of the air flow tee joint is connected with the connecting hose, the other end of the air flow tee joint is connected with the air distribution box, and the bottom of the air distribution box is connected with a dust collection system. The technical problems that an existing ventilation device is fixed in ventilation area and poor in ventilation effect are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of underground excavation engineering, and in particular relates to a zoned ventilation device for an excavation working face and a zoned ventilation method thereof. Background Art

[0002] Tunnel excavation ventilation not only needs to eliminate harmful gases from the working face, but also needs to eliminate dust. In particular, the dust at the excavation working face is the most seriously polluted area in the entire mine. Therefore, solving the ventilation problem will also help solve the dust problem.

[0003] Coal mine safety regulations require that forced-in ventilation openings on the tunneling face be no more than 10 meters from the working face, and exhaust ventilation openings no more than 5 meters. Currently, extension of the air duct is performed as a separate construction step, following a construction cycle. This makes it difficult to ensure that the air duct's ventilation opening meets these requirements from the head-on working face. The progress and location of the air duct extension are often constrained by the overall construction process. Delays or changes in other steps in the construction process can also affect the air duct extension, resulting in the ventilation opening being unable to be adjusted to the appropriate distance from the tunneling face in a timely manner, significantly impacting production. If forced-in ventilation is used for a fast-moving tunneling face, the tunneling equipment is extensive and the front is long. For example, the head-on bolter drill itself is over 10 meters long. Therefore, to meet these requirements, the air duct outlet must be placed above the tunneling machine. However, this can interfere with normal anchoring operations, and the concentrated wind speed can also have adverse health effects on personnel. If exhaust ventilation is used, if the air duct cannot be flexibly moved with the tunneling progress, production will be significantly restricted.

[0004] Furthermore, the current method of extending the ducts according to the cyclical advance sequence requires determining the length of each section to facilitate construction matching. The existing duct length has a certain impact on construction speed in single-line operations. On-site construction generally uses 10m sections. In fact, with this method of constructing ducts of a certain length according to the cyclical process sequence, the duct outlet exceeds the distance from the ventilation opening to the working face required by coal mine safety regulations when the duct is extended. Furthermore, the duct outlet and the excavation working face are in constant flux, resulting in unstable ventilation airflow at the working face, which is not conducive to ventilation management.

[0005] Dust control in the working face is closely linked to ventilation. Despite extensive research and implementation of methods such as spraying, isolation, foam covering, and negative pressure suction to address dust issues in the tunneling face, ensuring safe working conditions for personnel in the excavation and anchoring areas remains difficult. Dust reduction in tunneling is particularly challenging. Techniques such as spraying, isolation, and foam covering have theoretical limitations, meaning they are impossible to achieve a dust-free environment. While negative pressure suction is theoretically feasible, achieving dust-free operation with existing forced-in ventilation systems requires extremely powerful suction capabilities and requires the forced-in blower to be located far from the working face, often exceeding the limits permitted by coal mine safety regulations. This necessitates improvements in ventilation technology to address these issues.

[0006] Air diversion in wall-mounted ducts is a method of regulating airflow to assist in dust control. This diversion facilitates dust collection and improves dust removal effectiveness. Chinese patent CN112879068A discloses a large-vortex dust collection and swirl air distribution system and a zoning ventilation and dust control method for a fully mechanized excavation face. Although this device forms a swirl air distribution area through lateral air outlets in conjunction with the tunnel sidewalls, the large-vortex dust collection area and the swirl air distribution area can move forward with the fully mechanized excavator, providing a large amount of fresh, unpolluted air to the working area except the head area. This greatly alleviates the gas accumulation problem that often occurs in traditional wall-mounted duct technology and effectively reduces the risk of gas explosions. However, the wind direction of the air outlet of this device is fixed, so the ventilation area formed is also fixed, which cannot achieve a good ventilation effect. Summary of the Invention

[0007] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a zoned ventilation device for an excavation working face and a zoned ventilation method thereof, which solves the technical problems of the existing ventilation devices with fixed ventilation areas and poor ventilation effects.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions: A zoned ventilation device for a tunneling working face, comprising a tunneling machine body, wherein the tunneling machine body is provided with an air induced air system and an air distribution system, wherein the air induced air system comprises a tunnel air duct, wherein the tunnel air duct is connected to a telescopic air duct, and wherein the telescopic air duct is connected to a connecting hose; The air distribution system includes an air flow tee and an air distribution box. One end of the air flow tee is connected to the connecting hose, and the other end is connected to the air distribution box. The dust collection system is connected in the air flow tee.

[0009] In the above technical solution, the tunnel duct draws in fresh air from the outside, while the telescopic duct draws fresh air from the tunnel duct and distributes it to the excavation working face. The connecting hose is required because the position of the excavation working face constantly changes as the excavation machine operates on it. Since the excavation machine and the telescopic duct cannot move linearly, the connecting hose is required for adjustment. The connecting hose has a certain degree of flexibility to adapt to the dynamic changes of the working face, ensuring that the ventilation system can always cover the working face and avoiding ventilation interruptions or reduced efficiency due to movement of the working face.

[0010] The connecting hose moves with the tunnel boring machine, ensuring that the ventilation system can advance synchronously with the working face and maintain the ventilation effect.

[0011] Preferably, an airflow regulating motor is provided on the airflow tee, a flow regulating damper is provided in the pipe of the airflow tee connected to the connecting hose, and an end cover is provided on the outer side of the flow regulating damper.

[0012] Further preferably, the pipe on the airflow tee connected to the connecting hose and the pipe connected to the air distribution box are vertically connected.

[0013] Preferably, a telescopic air duct is connected between the telescopic air cylinder and the connecting hose.

[0014] Preferably, the air distribution box is provided with a plurality of air distribution box air outlets.

[0015] Further preferably, a regulating valve is provided on the side of the air distribution box away from the airflow tee.

[0016] Further preferably, the regulating valve is electrically connected to the airflow regulating motor, and the airflow regulating motor is equivalent to the power source of the regulating valve, which facilitates the adjustment of the wind direction or air volume of the airflow regulating damper.

[0017] In the above technical solution, the specific control method of the control valve is: when designing the ventilation system, the direction and path of the airflow are planned according to the airflow requirements of each working area. The position of the air distribution box and the flow regulating damper is the key node. When the airflow needs to be directed to a specific area, the control valve is opened to open the flow regulating damper, and the airflow will flow to the area along the preset channel. In order to provide fresh air to the mining working face, the air distribution box control valve and the flow regulating damper leading to the working face will be opened to allow the airflow to flow from the air inlet shaft through the tunnel wind duct, the telescopic wind duct, the air distribution box, and the opened damper to the mining working face.

[0018] Preferably, a wind tube suspension device is provided on the tunneling machine body, and the wind tube suspension device includes a suspension wire rope, and a top plate hook is provided on the suspension wire rope, and the top plate hook is connected to the pulley hook, and the pulley hook is connected to the telescopic wind tube.

[0019] Preferably, a telescopic duct release device is provided at the connection between the telescopic duct and the air induction system, and the telescopic duct release device includes a pipe clamp clamp, and the pipe clamp clamp is connected to the U-shaped clamp through the duct bracket.

[0020] Further preferably, the pipe clamp ring is connected to the U-shaped clamp ring through two connecting rods, and the connecting rods are vertically connected to the pipe clamp ring and the U-shaped clamp ring respectively, so as to facilitate improving the support of the telescopic air duct.

[0021] Further preferably, the air duct bracket is a support rod, one end of the support rod is vertically connected to the bottom of the pipe clamp clamp, and the other end is vertically connected to the bottom of the U-shaped clamp, so as to facilitate improving the support of the telescopic air duct.

[0022] Preferably, a diversion interface is provided between the tunnel air duct and the telescopic air duct, and the diversion interface includes two clamping edges, a socket hole is passed through the two clamping edges, an air outlet is opened on the socket hole, and an air outlet guide plate is provided on the air outlet.

[0023] Preferably, a plurality of air outlet guide plates are provided.

[0024] In the above technical solution, the diversion interface is used to connect the tunnel air duct and the telescopic air duct.

[0025] Further preferably, a hanging buckle is provided on the top of the socket hole to facilitate hanging the diversion interface.

[0026] Preferably, the dust suction system includes a dust suction duct, one end of the dust suction duct is connected to the dust suction fan, and the other end is provided with a negative pressure dust suction port.

[0027] Further preferably, the negative pressure suction port is located 1000-3000 mm away from the front.

[0028] The present invention also provides a method for performing zoned ventilation using the above-mentioned zoned ventilation device for a tunneling working face, comprising the following steps: A tunnel air duct is installed on the tunneling machine body, with the air outlet of the tunnel air duct facing the head direction of the tunneling working face of the tunneling machine body. The tunnel air duct is connected to a telescopic air duct, and the telescopic air duct is connected to a connecting hose. The connection of the tunnel air duct, the telescopic air duct and the connecting hose continuously supplies fresh air to the air flow tee and the air distribution box. One end of the airflow tee is connected to the connecting hose, and the other end is connected to the air distribution box. The bottom of the air distribution box is connected to a dust suction system, so that the airflow tee and the air distribution box form a positive pressure airflow area toward the head area of the excavation working face of the tunneling machine body, the dust suction system and the air distribution box form a mixed airflow area toward the head area in the opposite direction of the excavation working face of the tunneling machine body, and the area inside the tunnel outside the tunnel wind duct forms a full-pressure reflux area.

[0029] In the above technical solution, as the tunneling machine moves toward the tunneling face, the mixed airflow zone gradually accumulates at the end opposite to the tunneling face of the tunneling machine, thereby forming a full-pressure recirculation zone. The positive-pressure airflow zone, mixed airflow zone, and full-pressure recirculation zone move with the tunneling machine.

[0030] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a zoned ventilation device for a tunneling working face, which realizes zoned ventilation of the tunneling working face by setting an air induced air system and an air distribution system, ensuring that the working face always has sufficient fresh air flow during the tunneling process. The induced draft system and the wind flow tee and wind distribution box in the wind distribution system realize the diversion and regulation of the wind flow. Through the roadway wind duct in the induced draft system and the telescopic wind duct, and the air outlet from the wind flow tee and one side of the wind distribution box, a positive pressure wind flow area is formed in the head direction area of the working face of the tunneling machine body, and the area is filled with fresh wind flow. The wind outlet of the dust suction system is mixed with a part of the fresh air diverted from the other side of the wind distribution box, so that a mixed wind flow area is formed in the head direction area of the working face of the tunneling machine body, and the area is filled with fresh wind flow. At the same time, the dust removal effect is effectively improved through the cooperation of the air divider and the dust removal system. The wind flow in the mixed wind flow area encounters resistance during the flow process and gradually accumulates at the head and tail of the working face of the tunneling machine body in the opposite direction, so that a full-pressure reflux area is formed in the area inside the tunnel outside the roadway wind duct, ensuring that the wind flow can effectively cover the working face and improve ventilation efficiency. In summary, ventilation in the three areas can achieve zoned ventilation, improving dust removal efficiency while achieving reasonable airflow distribution; air distribution on the tunneling equipment can also ensure that the airflow flows evenly to the drilling and anchoring working area to avoid the generation of vortexes. In addition, the air distributor ensures that the airflow is evenly distributed to all areas of the working face, avoiding local poor ventilation. During the air distribution process, the airflow can carry dust, which is discharged through the dust collection system to improve the working environment. By combining the tunneling working face air intake system, the air distribution system and the tunneling machine body process, the tunnel air duct and the telescopic air duct outlet are connected to the tunneling machine to form three-zone ventilation, ensuring that fresh airflow can be continuously and reliably supplied to the working area, achieving the effect of suppressing dust dispersion.

[0031] Furthermore, by installing an airflow control motor and damper on the airflow tee, the direction and volume of the airflow can be flexibly adjusted, ensuring that the airflow is precisely distributed according to the needs of the work surface. The installation of the damper and air flow control device further enhances the controllability of the airflow and improves the flexibility of the ventilation system.

[0032] Furthermore, the pipe connected to the connecting hose in the airflow tee and the pipe connected to the air distribution box are vertically connected. This structural design simplifies the airflow distribution path, reduces airflow resistance, improves ventilation efficiency, and is also conducive to the compact layout of the equipment.

[0033] Furthermore, multiple air outlets are provided on the air distribution box, which can evenly distribute the airflow to different areas of the working surface, ensuring consistent ventilation effects in all parts of the working surface and avoiding the occurrence of local poor ventilation.

[0034] Furthermore, by installing a wind tube suspension device, the telescopic wind tube can be securely suspended on the tunneling machine body, ensuring that the wind tube remains stable during the tunneling process and preventing the ventilation effect from being affected by the wind tube shaking or falling off. The design of the suspension wire rope and pulley hook makes the installation and adjustment of the wind tube more convenient.

[0035] Furthermore, the telescopic duct release device facilitates its release and retraction. The design of the pipe clamp and U-shaped clamp ensures the secure connection between the duct and the induced draft system, and the duct bracket further enhances the duct's stability. The duct outlet is located on the machine body, eliminating the traditional large-diameter, negative pressure, long duct installation and the potential safety hazards associated with long distances across multiple independent dynamic devices. The duct outlet, synchronized with the machine body, also allows for continuous release of the duct over long distances, eliminating the conventional hanging duct installation process and saving construction time.

[0036] Furthermore, the diversion interface provides greater flexibility in the connection between the tunnel duct and the telescopic duct, allowing the telescopic duct and connecting hose to be adjusted in length to accommodate the movement of the tunneling machine. The design of the snap-on edge and socket holes simplifies installation and removal. The air outlet guide plate directs the airflow, ensuring even distribution across the working surface and preventing concentrated or uneven airflow.

[0037] Furthermore, the dust collection system effectively removes dust generated at the work surface. The combination of the dust collection duct and dust collection fan ensures efficient dust collection and treatment, improving air quality at the work surface and safeguarding worker health. The dust collection duct centrally collects dust, preventing it from spreading to other areas of the work surface and significantly improving the working environment. By centrally transporting dust to the dust collection fan through the dust collection duct, dust generated during excavation can be more efficiently processed, reducing the risk of dust to worker health and equipment.

[0038] Furthermore, the negative pressure suction port allows the suction fan to be aimed directly at the dust source generated by the tunnel boring machine, achieving precise dust collection and preventing dust from spreading to other areas of the work surface. By directly absorbing dust near the tunnel boring machine, the dust concentration at the work surface is significantly reduced, improving the working environment for workers and reducing occupational health risks.

[0039] The present invention also provides a ventilation method for the aforementioned zoned ventilation device. This method creates positive pressure airflow zones, mixed airflow zones, and full-pressure return airflow zones within the tunneling working face, ensuring sufficient fresh airflow at all times while effectively exhausting contaminated air. This ventilation method automatically adjusts with the movement of the tunneling machine, ensuring optimal ventilation at all times and improving the safety and efficiency of tunneling operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a structural diagram of the zoned ventilation device for the excavation working face of the present invention; Figure 2 This is a structural diagram of the air induced system of the zoned ventilation device for the excavation working face of the present invention; Figure 3 This is a structural diagram of the wind flow tee of the zoned ventilation device for the excavation working face of the present invention; Figure 4 This is a structural diagram of the wind flow tee of the zoned ventilation device for the excavation working face of the present invention; Figure 5 This is a structural diagram of the air duct suspension device of the tunneling working face partition ventilation device of the present invention; Figure 6 This is a structural diagram of the air duct release device of the tunneling working face partition ventilation device of the present invention; Figure 7 This is a structural diagram of the air duct connection device of the tunneling working face partition ventilation device of the present invention; Among them: 1-dust suction system; 1-1 negative pressure suction port; 1-2 dust suction air duct; 1-3 dust suction fan; 1-4 tunneling machine body; 2-induction air system; 2-1 connecting hose; 2-2 telescopic air duct; 2-3 air cylinder hanging device; 2-3-1 hanging wire rope; 2-3-2 roof hook; 2-3-3 pulley hook; 2-4 Tunnel air duct; 2-5 Telescopic air duct; 2-6 Telescopic air duct release device; 2-6-1 Pipe clamp clamp; 2-6-2 U-shaped clamp; 2-6-3 Air duct bracket; 3-Air distribution system; 3-1 Airflow tee; 3-1-1 Airflow regulating motor; 3-1-2 Air flow regulating damper; 3-1-3 End cover; 3-2 Air distribution box; 3-3 Air distribution box outlet; 3-5 Induced air interface; 3-6 Direct air outlet; 3-7 Side diversion outlet; 4-1 Monitoring system; 4-2 Control valve; 5-Diversion interface; 5-1 Clamping edge; 5-2 Air outlet; 5-3 Air outlet guide plate; 5-4 Socket hole; 5-5 Hanging buckle; 6-Positive pressure airflow zone; 7-Mixed airflow zone; 8-Full pressure reflux zone. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the solutions of the present invention, 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 embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0042] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0043] The present invention is described in further detail below with reference to the accompanying drawings: Example 1 like Figures 1 to 7 As shown, a zoned ventilation device for a tunneling working face includes a tunneling machine body 1-4, the tunneling machine body 1-4 is provided with an air induced air system 2 and an air distribution system 3, the air induced air system 2 includes a tunnel air duct 2-4, the tunnel air duct 2-4 is connected to a telescopic air duct 2-5, the telescopic air duct 2-5 is connected to a telescopic air pipe 2-2, and the telescopic air pipe 2-2 is connected to a connecting hose 2-1; The air distribution system 3 includes an air flow tee 3-1 and an air distribution box 3-2. One end of the air flow tee 3-1 is connected to the connecting hose 2-1, and the other end is connected to the air distribution box 3-2. The dust collection system 1 is connected to the air flow tee 3-1.

[0044] Preferably, a monitoring system 4-1 is provided on the tunneling machine body 1-4. The function of the monitoring system is to monitor the wind flow in each area, determine whether the coal mine safety regulations and construction specifications are met according to the size of the wind flow, and technically adjust the air volume to balance the wind flow in each partition.

[0045] Further preferably, the monitoring system 4-1 uses sensors.

[0046] Preferably, the airflow tee 3-1 is provided with an airflow regulating motor 3-1-1, a flow regulating damper 3-1-2 is provided in the pipe of the airflow tee 3-1 connected to the connecting hose 2-1, and an end cover 3-1-3 is provided on the outside of the flow regulating damper 3-1-2.

[0047] Preferably, the pipe connected to the connecting hose 2-1 and the pipe connected to the air distribution box 3-2 are vertically connected.

[0048] In the above technical solution, an induced draft interface 3-5, a direct blowing air outlet 3-6 and a side diversion outlet 3-7 are respectively provided on the airflow tee 3-1; an induced draft interface 3-5 is provided on the pipe of the airflow tee 3-1 connected to the connecting hose 2-1, and the induced draft interface 3-5 is connected to the direct blowing air outlet 3-6 in a concentric circle straight line; a side diversion outlet 3-7 is provided on the pipe perpendicular to the pipe where the induced draft interface 3-5 is located, and a flow regulating damper 3-1-2 is provided in each of the pipes where the side diversion outlet 3-7 and the direct blowing air outlet 3-6 are located, and the upper shaft of the flow regulating damper 3-1-2 is connected to the airflow regulating motor 3-1-1 for adjusting the rotation angle of the damper; the airflow regulating motor 3-1-1 is provided with a start-stop controller, a steering mechanism push rod or a rotating shaft motor, the steering mechanism is provided with a return spring, and a damper limit regulator is also provided. The start-stop controller is linked to the dust removal equipment, and the start-stop controller controls the steering mechanism to realize damper angle adjustment.

[0049] Further preferably, the airflow tee 3-1 is connected to the ventilation fresh air flow, and the fresh air flow is diverted by the air distribution box 3-2; the difference in air volume on both sides of the air distribution box 3-2 is no more than 10%, which is achieved by the air volume adjustment damper 3-4. When the dust suction fan 1-3 of the tunneling machine body 1-4 is turned on, the flow adjustment damper 3-1-2 is open; when the dust suction fan 1-3 of the tunneling machine body 1-4 is turned off, the flow adjustment damper 3-1-2 is at the maximum air volume state. By monitoring the dust suction fan 1-3 switch through the wind speed sensor located behind the flow adjustment damper 3-1-2, the wind speed is calculated as the information that triggers the action of the end cover 3-1-3, so that the airflow tee 3-1 and the air distribution box 3-2 can distribute the airflow to ensure balance or reversal. Further preferably, the direct blowing air outlet 3-6 is 5-10m away from the working face of the tunneling machine body 1-4.

[0050] Preferably, the air distribution box 3-2 is provided with a plurality of air distribution box air outlets 3-3.

[0051] Further preferably, a regulating valve 4-2 is provided on the side of the air distribution box 3-2 away from the air flow tee 3-1.

[0052] Further preferably, the regulating valve 4-2 is electrically connected to the airflow regulating motor 3-1-1, and the airflow regulating motor 3-1-1 is equivalent to the power source of the regulating valve 4-2, which facilitates the adjustment of the wind direction or air volume of the flow regulating damper 3-1-2.

[0053] Preferably, a wind tube suspension device 2-3 is provided on the tunneling machine body 1-4, and the wind tube suspension device 2-3 includes a suspension wire rope 2-3-1, and a top plate hook 2-3-2 is provided on the suspension wire rope 2-3-1, and the top plate hook 2-3-2 is connected to the pulley hook 2-3-3, and the pulley hook 2-3-3 is connected to the telescopic wind tube 2-5.

[0054] Preferably, a telescopic duct release device 2-6 is provided at the connection between the telescopic duct 2-5 and the air induced draft system 2, and the telescopic duct release device 2-6 includes a pipe clamp clamp 2-6-1, one end of the pipe clamp clamp 2-6-1 is connected to a U-shaped clamp 2-6-2, and a duct bracket 2-6-3 is connected between the U-shaped clamp 2-6-2 and the pipe clamp clamp 2-6-1.

[0055] Further preferably, the telescopic air duct 2-2 passes through the telescopic air tube 2-5 and is inserted into the alley air tube 2-4, and the telescopic air tube 2-5 is connected to the alley air tube 2-4 through the air tube suspension device 2-3; the telescopic air duct 2-2 is composed of three sections of air duct, the middle section is placed outside the front and rear sections, and the air induced system 2 is suspended on the suspension wire rope 2-3-1; there is a connecting hose 2-1 at the front end of the telescopic air duct 2-2.

[0056] Further preferably, the pipe clamp ring 2-6-1 is connected to the U-shaped clamp ring 2-6-2 through two connecting rods, and the connecting rods are vertically connected to the pipe clamp ring 2-6-1 and the U-shaped clamp ring 2-6-2 respectively, so as to facilitate improving the support of the telescopic air duct 2-5.

[0057] Further preferably, the air duct bracket 2-6-3 is a support rod, one end of the support rod is vertically connected to the bottom of the pipe clamp clamp 2-6-1, and the other end is vertically connected to the bottom of the U-shaped clamp 2-6-2, so as to enhance the support of the telescopic air duct 2-5.

[0058] Further preferably, the telescopic air duct releasing device 2-6 is used to self-release the telescopic air duct, a pipe clamp ring 2-6-1 is provided at the front end to be connected to the telescopic air duct 2-2, and an air duct bracket 2-6-3 is provided at the lower part to fix the stability of the telescopic air duct 2-5.

[0059] Preferably, a diversion interface 5 is provided between the tunnel air duct 2-4 and the telescopic air duct 2-5, and the diversion interface 5 includes two clamping edges 5-1, and a socket hole 5-4 is passed through the two clamping edges 5-1. An air outlet 5-2 is opened on the socket hole 5-4, and a plurality of air outlet guide plates 5-3 are provided on the air outlet 5-2.

[0060] Further preferably, a hanging buckle 5 - 5 is provided on the top of the socket hole 5 - 4 to facilitate hanging the diversion interface 5 .

[0061] Preferably, the dust collection system 1 includes a dust collection air duct 1-2, one end of the dust collection air duct 1-2 is connected to the dust collection fan 1-3, and the other end is provided with a negative pressure dust collection port 1-1.

[0062] Further preferably, the negative pressure suction port 1-1 is 1000-3000 mm away from the head direction of the working face of the tunneling machine body 1-4.

[0063] The present invention also provides a method for performing zoned ventilation using the above-mentioned zoned ventilation device for a tunneling working face, comprising the following steps: A tunnel air duct 2-4 is installed on the tunneling machine body 1-4, with the air outlet of the tunnel air duct 2-4 facing the head of the tunneling working face of the tunneling machine body 1-4. The tunnel air duct 2-4 is connected to a telescopic air duct 2-5, and the telescopic air duct 2-5 is connected to a connecting hose 2-1. The connection between the tunnel air duct 2-4, the telescopic air duct 2-5 and the connecting hose 2-1 continuously supplies fresh air to the air flow tee 3-1 and the air distribution box 3-2. One end of the airflow tee 3-1 is connected to the connecting hose 2-1, and the other end is connected to the air distribution box 3-2. The bottom of the air distribution box 3-2 is connected to a dust suction system 1, so that the airflow tee 3-1 and the air distribution box 3-2 form a positive pressure airflow zone 6 toward the head area of the tunneling working face of the tunneling machine body 1-4, and the dust suction system 1 and the air distribution box 3-2 form a mixed airflow zone 7 toward the head and opposite direction area of the tunneling working face of the tunneling machine body 1-4. During the movement of the tunneling machine body 1-4 toward the tunneling working face, the mixed airflow zone 7 gradually accumulates at the head and opposite end of the tunneling working face of the tunneling machine body 1-4, forming a full-pressure reflux zone 8.

[0064] The above technical solution realizes the random follow-up of fresh air and the airflow of the tunnel duct 2-4 is diverted in three directions at the tunnel duct 2-4 and the airflow tee 3-1, that is, the area between the airflow tee 3-1 and the air distribution box 3-2 is the positive pressure airflow area 6, so that the head direction area of the tunneling machine working face is full of fresh airflow, and the dust collection system 1 to the airflow tee 3-1 form a mixed recirculation area 7 toward the head direction area of the tunneling machine 1-4 tunneling working face, so that the air discharged by the dust collection system 1 and a part of the fresh air diverted by the air distribution box 3-2 are mixed and flowed in the head direction area of the working face, so that the head direction area of the tunneling machine 1-4 working face is full of fresh airflow, and the area inside the tunnel outside the tunnel duct 2-4 is the full pressure recirculation area 8, so that fresh airflow is formed at the head direction end tail of the tunneling machine working face, effectively covering the working face and improving ventilation efficiency.

[0065] The suction volume of the negative pressure suction port 1-1 is set according to the following conditions: Required air volume: Usually indicates the required air volume at the mining face, measured in cubic meters per minute. The "mining face" here refers to the area where coal is mined. This air volume is required to ensure sufficient fresh air at the mining face to dilute and expel harmful gases such as methane.

[0066] : Refers to the absolute gas emission rate of the mining face, measured in cubic meters per minute. It reflects the actual gas emission rate per unit time.

[0067] : Gas emission imbalance coefficient of the mining face. Since gas emission may fluctuate at different times, this coefficient is used to account for this imbalance. It is a dimensionless coefficient generally derived through actual observation and statistical analysis.

[0068] q : Represents the absolute amount of carbon dioxide emitted from the mining face, in cubic meters per minute, that is, the actual amount of carbon dioxide emitted from the mining face per unit time.

[0069] k : CO2 emission imbalance coefficient at the mining face. Similar to the gas emission imbalance coefficient, this is a dimensionless coefficient used to account for the temporal imbalance of CO2 emission.

[0070] : Refers to the maximum number of people working simultaneously at the mining face. "4" is an empirical coefficient, indicating that each person needs 4 cubic meters of fresh air per minute.

[0071] : Indicates the total air volume required when using explosion-proof diesel-powered locomotives underground in coal mines, in cubic meters per minute, to ensure that there is enough fresh air in the locomotive operating area to dilute the harmful gases emitted by the locomotive.

[0072] : Usually refers to the maximum air demand at other air-using locations in the area except explosion-proof diesel-powered locomotives, measured in cubic meters per minute.

[0073] : Refers to the number of explosion-proof diesel-powered locomotives for coal mines running simultaneously.

[0074] : The power of each explosion-proof diesel locomotive used in coal mines, generally expressed in kilowatts (kW). "4" is a coefficient related to locomotive power and is used to calculate the required air volume per kilowatt of locomotive power.

[0075] (1) Calculated based on gas outflow volume

[0076] (2) Calculated based on carbon dioxide outflow:

[0077] (3) Calculated by the number of staff:

[0078] (4) Calculated based on the power of the explosion-proof diesel power unit for coal mines:

[0079] Verify according to the wind speed on the working face: The ventilation cross-sectional area is calculated by deducting the area occupied by the equipment from the area of the tunnel, and then calculated based on a wind speed of 0.25m / s.

[0080] Calculate the sum of (1), (2), and (3) according to the above four items, compare it with the fourth item, and take the maximum value.

[0081] Verify minimum air volume:

[0082] Verify the maximum air volume:

[0083] The diversion air volume of diversion interface 5 is calculated according to the following formula:

[0084] Where: Q7-diversion air volume of diversion interface 5, m 3 / min Qf- total air volume of tunnel duct, m 3 / min Q1-Suction volume of dust suction port, m 3 / min.

[0085] The above content is only for explaining the technical idea of the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A zoned ventilation device for an excavation working face, characterized in that: The tunneling machine body (1-4) is provided with an air induced air system (2) and an air distribution system (3), the air induced air system (2) includes a tunnel air duct (2-4), the tunnel air duct (2-4) is connected to a telescopic air duct (2-5), and the telescopic air duct (2-5) is connected to a connecting hose (2-1); The air distribution system (3) comprises an air flow tee (3-1) and an air distribution box (3-2); one end of the air flow tee (3-1) is connected to the connecting hose (2-1), and the other end is connected to the air distribution box (3-2); the bottom of the air distribution box (3-2) is connected to a dust collection system (1).

2. A zoned ventilation device for an excavation working face according to claim 1, characterized in that: The airflow tee (3-1) is provided with an airflow regulating motor (3-1-1), a flow regulating damper (3-1-2) is provided in a pipe of the airflow tee (3-1) connected to the connecting hose (2-1), and an end cover (3-1-3) is provided on the outside of the flow regulating damper (3-1-2).

3. The tunneling working face partition ventilation device according to claim 1, characterized in that: A telescopic air duct (2-2) is connected between the telescopic air cylinder (2-5) and the connecting hose (2-1).

4. The tunneling working face partition ventilation device according to claim 1, characterized in that: The air distribution box (3-2) is provided with a plurality of air distribution box air outlets (3-3).

5. The tunneling working face partition ventilation device according to claim 1, characterized in that: A wind tube suspension device (2-3) is provided on the tunneling machine body (1-4), the wind tube suspension device (2-3) comprises a suspension wire rope (2-3-1), a top plate hook (2-3-2) is provided on the suspension wire rope (2-3-1), the top plate hook (2-3-2) is connected to a pulley hook (2-3-3), and the pulley hook (2-3-3) is connected to the telescopic wind tube (2-5).

6. The tunneling working face zone ventilation device according to claim 1, characterized in that: A telescopic wind tube release device (2-6) is provided at the connection between the telescopic wind tube (2-5) and the air induction system (2). The telescopic wind tube release device (2-6) comprises a pipe clamp ring (2-6-1). The pipe clamp ring (2-6-1) is connected to a U-shaped clamp ring (2-6-2) via a wind tube bracket (2-6-3).

7. The tunneling working face zone ventilation device according to claim 1, characterized in that: A diversion interface (5) is provided between the laneway air duct (2-4) and the telescopic air duct (2-5), the diversion interface (5) comprising two clamping edges (5-1), a sleeve hole (5-4) passing through the two clamping edges (5-1), an air outlet (5-2) being provided on the sleeve hole (5-4), and an air outlet guide plate (5-3) being provided on the air outlet (5-2).

8. The tunneling working face zone ventilation device according to claim 7, characterized in that: A plurality of air outlet guide plates (5-3) are provided.

9. The tunneling working face zone ventilation device according to claim 1, characterized in that: The dust collection system (1) comprises a dust collection air duct (1-2), one end of the dust collection air duct (1-2) being connected to a dust collection fan (1-3).

10. A method for performing zoned ventilation using the tunneling working face zoned ventilation device according to any one of claims 1 to 9, characterized in that: The following steps are involved: A tunnel wind tube (2-4) is installed on the tunneling machine body (1-4), the air outlet of the tunnel wind tube (2-4) faces the head direction of the tunneling working face of the tunneling machine body (1-4), the tunnel wind tube (2-4) is connected to the telescopic wind tube (2-5), and the telescopic wind tube (2-5) is connected to the connecting hose (2-1). The tunnel wind tube (2-4), the telescopic wind tube (2-5) and the connecting hose (2-1) are connected to continuously supply fresh air to the air flow tee (3-1) and the air distribution box (3-2); One end of the airflow tee (3-1) is connected to the connecting hose (2-1), and the other end is connected to the air distribution box (3-2). The bottom of the air distribution box (3-2) is connected to a dust suction system (1), so that the airflow tee (3-1) and the air distribution box (3-2) form a positive pressure airflow area (6) toward the head area of the excavation working face of the excavation machine body (1-4), the dust suction system (1) and the air distribution box (3-2) form a mixed airflow area (7) toward the head area of the excavation working face of the excavation machine body (1-4), and the area inside the roadway outside the roadway wind duct (2-4) forms a full pressure return flow area (8).

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