A return air system for a non-blasted site

Abstract

The application relates to a return air system of a non-blasting mining field and relates to the technical field of mine excavation. The application is characterized in that a layered return air connecting channel is arranged, the layered return air connecting channel is connected with a pre-buried return air pipe through a pipeline, the upper disc return air connecting channel of a mining area can be connected with each layered mining field, the connection of the ventilation return circuits in each layered mining field is realized, the ventilation distance can be shortened, and the air flow penetrating through the non-blasting mining field is effectively formed; meanwhile, a pressure-in type fan and a suction type fan are installed, when excavation and mining reach the position of the corresponding pre-buried return air cylinder, the mining entry can be connected with the upper disc return air connecting channel of the mining area through the layered return air connecting channel, negative pressure can be generated at the layered return air connecting channel, collected dust can be directly conveyed from the layered return air connecting channel to the upper disc return air connecting channel of the mining area, the ventilation distance is shortened, the return air efficiency is effectively improved, the ventilation effect in the entry is obviously improved, and the working environment of the non-blasting mining field can be effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mine excavation, in particular to a return air system of a non-blasting mining field. BACKGROUND

[0002] Non-blasting mechanized continuous mining operation is a modern mining method, which is mainly applied to the mining of resources such as coal mines and metal mines. Unlike the traditional blasting mining method, non-blasting mechanized mining operation mainly relies on mechanical equipment for excavation and mining.

[0003] In non-blasting mechanized continuous mining operation, boom-type roadheader is increasingly widely used. However, due to the long mining entry and the large amount of heat generated by the equipment during operation, the temperature inside the mining field is relatively high. In addition, a large amount of dust is generated during the cutting operation.

[0004] When using the existing conventional ventilation method for cooling and dust removal, due to the long ventilation distance and large air resistance, the air flow cannot effectively penetrate the mining field, and the ventilation, cooling and dust removal requirements of the non-blasting mining field cannot be met, resulting in a poor working environment. SUMMARY

[0005] To solve or partially solve the problems in the related art, the present application provides a return air system of a non-blasting mining field, which can effectively improve the return air efficiency and effectively improve the working environment of the non-blasting mining field.

[0006] The present application provides a return air system of a non-blasting mining field, which comprises:

[0007] a return air link of an upper disc of a mining area, the air outlet end of the return air link of the upper disc of the mining area being in communication with a main return air system of the mining field;

[0008] Each of the sublevel mining fields of the non-blasting mining field is provided with a sublevel return air link, which is in communication with the return air link of the upper disc of the mining area;

[0009] Each of the mining entries in each of the sublevel mining fields of the non-blasting mining field is provided with a reserved return air cylinder, the reserved return air cylinders in each of the mining entries are in communication with each other, and the reserved return air cylinder in the first mining entry is in communication with the sublevel return air link in the sublevel mining field; at the same time, for two adjacent sublevel mining fields, the reserved return air cylinders in each of the mining entries in the upper sublevel mining field are in communication with the reserved return air cylinders in the corresponding mining entries in the lower sublevel mining field;

[0010] A pressure-in type fan is provided in each of the mining entries in each of the sublevel mining fields, and the pressure-in type fan is in communication with the air inlet pipeline in the corresponding mining entry that needs to be mined during mining;

[0011] The extraction fan is connected with the upper disc air return connecting pipe of the mining area, and the air extraction pipeline is arranged in each access in each sublevel mining field.

[0012] Optionally, in some embodiments of the present application:

[0013] For the two sublevel mining fields adjacent to each other in the non-blasting mining field, the ore pass of each sublevel mining field is designed on the left and right sides of the ore body, and the ore body is mined from opposite directions during the mining construction.

[0014] Optionally, in some embodiments of the present application:

[0015] For the two sublevel mining fields adjacent to each other in the non-blasting mining field, the sublevel accesses in the two sublevel mining fields are arranged in a staggered form.

[0016] Optionally, in some embodiments of the present application:

[0017] The sublevel air return connecting pipe in the first sublevel mining field of the non-blasting mining field is arranged at a position 40m-60m from the first access in the first sublevel mining field;

[0018] The reserved air return cylinder in each access in the first sublevel mining field of the non-blasting mining field is also arranged at the position of the sublevel air return connecting pipe.

[0019] Optionally, in some embodiments of the present application:

[0020] For the two sublevel mining fields adjacent to each other in the non-blasting mining field, the horizontal interval distance between the air return connecting pipe of the previous sublevel and the air return connecting pipe of the next sublevel is 30m-50m, and the vertical interval distance is 4m.

[0021] Optionally, in some embodiments of the present application:

[0022] The sublevel air return connecting pipe and the first access in the sublevel mining field are separated by a concrete filling retaining wall, and a communication pipeline is embedded in the concrete filling retaining wall.

[0023] Optionally, in some embodiments of the present application:

[0024] The air inlet pipeline and the air extraction pipeline in each access in each sublevel mining field are respectively arranged at the top of the sublevel mining field on both sides of the boom-type roadheader, and the air outlet of the air inlet pipeline is located at the rear end of the air extraction port of the air extraction pipeline.

[0025] Optionally, in some embodiments of the present application:

[0026] The air outlet of the air inlet pipeline is located 5m away from the air outlet of the air extraction pipeline.

[0027] Optionally, in some embodiments of the present application:

[0028] The air extraction pipeline is a negative pressure skeleton air duct.

[0029] Optionally, in some embodiments of the present application:

[0030] The air extraction pipeline is a negative pressure skeleton air duct.

[0031] The technical scheme provided by the present application can have the following beneficial effects:

[0032] By arranging the layered air return connection, and connecting the layered air return connection with the pre-buried air return pipe through the pipeline, the present application can make the upper disc air return connection of the mining area communicate with each layered stope, realize the communication of the ventilation loop in each layered stope, shorten the ventilation distance, and effectively form the air flow through the non-blasting stope.

[0033] By installing the positive pressure fan and the extraction fan, and arranging the air inlet pipeline and the air extraction pipeline, the present application can make the dust generated in the cutting process of the boom-type roadheader be discharged in time to the upper disc air return connection of the mining area through the air extraction pipeline, so as to enter the main air return system for treatment; meanwhile, when the mining access reaches the position of the corresponding pre-buried air return pipe, the mining access can communicate with the upper disc air return connection of the mining area through the layered air return connection, a negative pressure can be generated at the layered air return connection, the collected dust can be directly transported to the upper disc air return connection of the mining area from the layered air return connection, the ventilation distance is shortened, the air return efficiency is effectively improved, the ventilation effect in the mining access is significantly improved, and the working environment of the non-blasting stope can be effectively improved.

[0034] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0035] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which like reference characters refer to like parts throughout the several views, and wherein the exemplary embodiments of the present application are shown by way of illustration.

[0036] Figure 1 is a plane structure schematic diagram of the air return system of the non-blasting stope in the embodiment of the present application;

[0037] Figure 2 is a front view structure schematic diagram of the air return system of the non-blasting stope in the embodiment of the present application;

[0038] Figure 3is a side view structural schematic diagram of a return air system of a non-blasting field in an embodiment of the present application;

[0039] Reference signs: 1 - upper disc return air link of mining area, 2 - pressure type fan, 3 - extraction type fan. DETAILED DESCRIPTION

[0040] Embodiments of the present application will be described in more detail by referring to the drawings. Although embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present application is more thoroughly and completely conveyed to those skilled in the art, and the scope of the present application is fully conveyed to those skilled in the art.

[0041] It should be understood that although the terms "first", "second", "third", etc. can be used in this application to describe various information, these information should not be limited by these terms. These terms are only used to distinguish the same type of information from each other. For example, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information without departing from the scope of the present application. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0042] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0043] Unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] In non-explosive mechanized continuous mining operation, the application of cantilever type heading machine is increasingly widespread. However, due to the long mining heading and the large heat generated by the device during operation, the internal temperature of the stope is high. In addition, a large amount of dust is generated during the cutting operation.

[0045] When using the existing conventional ventilation mode for cooling and dust removal, due to the long ventilation distance and large air resistance, the air flow cannot effectively form through the stope, and the ventilation, cooling and dust removal requirements of the non-explosive stope cannot be met, resulting in a poor working environment.

[0046] In view of the above problems, the non-explosive stope return air system provided by the embodiments of the present application can effectively improve the return air efficiency and effectively improve the working environment of the non-explosive stope.

[0047] The technical solutions of the embodiments of the present application are described in detail below with reference to the drawings.

[0048] Figure 1 is a planar structural schematic diagram of the non-explosive stope return air system in the embodiments of the present application;

[0049] Figure 2 is a front view structural schematic diagram of the non-explosive stope return air system in the embodiments of the present application;

[0050] Figure 3 is a side view structural schematic diagram of the non-explosive stope return air system in the embodiments of the present application.

[0051] Referring to Figures 1-3 , a non-explosive stope return air system, the non-explosive stope return air system comprising:

[0052] a mining area upper disc return air link 1, the air outlet end of the mining area upper disc return air link 1 is connected with the main return air system of the stope;

[0053] Each sublevel stope in the non-explosive stope is provided with a sublevel return air link, and the sublevel return air link is connected with the mining area upper disc return air link 1;

[0054] Each heading in each sublevel stope of the non-explosive stope is provided with a reserved return air cylinder, the reserved return air cylinders in each heading are connected with each other, and the reserved return air cylinder in the first heading is connected with the sublevel return air link in the sublevel stope, and for the two adjacent sublevel stopes, the reserved return air cylinder in each heading of the upper sublevel stope is connected with the reserved return air cylinder in the corresponding heading of the lower sublevel stope.

[0055] As Figure 3As shown, the non-blasting stope in this embodiment is provided with two stratified stopes: a first stratified stope and a second stratified stope. Each stratified stope is provided with three stope access routes: a first access route, a second access route, and a third access route. The first, second, and third access routes in the first and second stratified stopes are connected to each other through reserved return air ducts.

[0056] In this embodiment, by setting up a stratified return air duct and connecting the stratified return air duct with the embedded return air duct through a pipeline, the upper plate return air duct 1 of the mining area can be connected with each stratified mining field, thereby realizing the connectivity of the ventilation circuits in each stratified mining field, shortening the ventilation distance, and effectively forming an airflow that runs through the non-explosive mining field.

[0057] Specifically: for the two adjacent stratified stopes in the non-blasting stope, the exit roads of the two adjacent stratified stopes are designed on the left and right sides of the ore body respectively, and the ore body is mined from opposite directions during the mining construction.

[0058] In this embodiment, the exits for the first and second tier stopes are located on the left and right sides of the ore body, respectively. During mining, the ore body is mined from opposite directions. This design allows for efficient and rapid switching between adjacent tiers, improving mining efficiency.

[0059] Specifically: for the two upper and lower adjacent stratified stopes in the non-blasting stope, the stratified approaches in the two upper and lower adjacent stratified stopes are arranged in a staggered form.

[0060] In this embodiment, the layered approaches in the first layer stope and the second layer stope are arranged in a staggered manner. By staggering the layered approaches, it is possible to avoid stress concentration in the stope caused by complete overlap of the approaches, thereby ensuring the safety of the mining operation.

[0061] Specifically: a layered return air duct in the first layered mining field of the non-explosive mining field is set at a position of 40m-60m of the first access road in the first layered mining field; the reserved return air ducts in each access road in the first layered mining field of the non-explosive mining field are also correspondingly set at the position of the layered return air duct.

[0062] like Figure 1 As shown, the first layer stope of the non-blasting stope is the first layer stope, and the first layer return air duct is set at a position of 50m from the first layer stope approach.

[0063] In this embodiment, by setting a layered return air duct at a position of 50m from the first access road in the first layered stope, the return air from the access road can be effectively concentrated, thereby enhancing the ventilation efficiency of the entire system.

[0064] Specifically, for two adjacent sublevel mining fields in the non-blasting field, the horizontal interval distance between the air return link of the previous sublevel and the air return link of the next sublevel is 30-50 m, and the vertical interval distance is 4 m.

[0065] In the embodiment, by arranging the air return link of the previous sublevel and the air return link of the next sublevel at a certain distance, the air flow short circuit phenomenon caused by the mutual interference of air flows of different sublevels can be avoided. During the adjacent entry stoping operation, a short-distance low-air-resistance air return channel can be formed by exposing the reserved air return cylinder, and a high-efficiency and fast air return system can be formed in the mining field by exposing the reserved air return cylinder of the previous sublevel during the stoping process, so as to quickly form a through air flow in the mining field and improve the operation environment of the non-blasting field.

[0066] Specifically, the one sublevel air return link is separated from the first entry in the one sublevel mining field by a concrete filling retaining wall, and a communication pipeline is embedded in the concrete filling retaining wall.

[0067] In the embodiment, the concrete filling retaining wall is used for separation, which can effectively isolate air flows and prevent air flows in different regions from crossing, while ensuring the structural stability of the non-blasting field and construction safety.

[0068] The pressure-in type fan 2 is arranged in each entry in each sublevel mining field, and the pressure-in type fan 2 is communicated with the air inlet pipeline in the corresponding entry requiring stoping during stoping.

[0069] In the embodiment, the pressure-in type fan 2 is installed at a position with good fresh air flow, which is a 2*7.5kW low-noise high-efficiency energy-saving fan.

[0070] Specifically, the air inlet pipeline is a positive pressure soft air cylinder.

[0071] In the embodiment, the positive pressure soft air cylinder is used as the air inlet pipeline, which can facilitate the quick disassembly and assembly of the air cylinder, synchronize with the stoping advancement, and ensure the ventilation effect.

[0072] The extraction type fan 3 is communicated with the upper disc air return link 1 of the mining area, and the extraction type fan 3 is communicated with the air extraction pipeline in the corresponding entry requiring stoping during stoping.

[0073] In the embodiment, the extraction type fan 3 is a 2*22kW low-noise high-efficiency energy-saving fan.

[0074] Specifically, the air extraction pipeline is a negative pressure skeleton air cylinder.

[0075] In the embodiment, the negative pressure framework air duct is used as the air exhaust pipeline, which can be conveniently connected with the pre-buried return air duct, and the negative pressure framework air duct has high strength and can better collect dust to ensure the air exhaust and dust removal effect.

[0076] Specifically, the air inlet pipeline and the air exhaust pipeline in each entry of each sublevel stope are respectively arranged at the top of the stope on both sides of the boom-type tunneling machine, and the air outlet of the air inlet pipeline is located at the rear end of the air exhaust opening of the air exhaust pipeline.

[0077] Specifically, the air outlet of the air inlet pipeline is located 5m away from the air exhaust opening of the air exhaust pipeline.

[0078] In the embodiment, the air outlet of the air inlet pipeline is located at the rear end of the air exhaust opening of the air exhaust pipeline, which can ensure that the boom-type tunneling machine forms a return air passage, so that the dust generated in the cutting process of the boom-type tunneling machine is discharged in time through the air exhaust pipeline to reduce the temperature in the entry and improve the working environment.

[0079] For the return air system of the non-blasting stope in the embodiment, when the entry is constructed and mined, the forced air fan 2 and the exhaust air fan 3 are installed, and the air inlet pipeline and the air exhaust pipeline are arranged, so that the dust generated in the cutting process of the boom-type tunneling machine is discharged in time through the air exhaust pipeline into the upper disc return air link 1 of the mining area to enter the main return air system for treatment; meanwhile, when the entry is mined to the position of the corresponding pre-buried return air duct, the entry can be connected with the upper disc return air link 1 of the mining area through the sublevel return air link, and since the air outlet of the exhaust air fan 3 is connected with the upper disc return air link 1 of the mining area, a negative pressure is generated at the sublevel return air link when the exhaust air fan 3 is used for air exhaust, and after the air exhaust pipeline in the entry is connected with the pre-buried return air duct through the pipeline, the collected dust can be directly transported from the sublevel return air link to the upper disc return air link 1 of the mining area, which shortens the ventilation distance, effectively improves the return air efficiency, significantly improves the ventilation effect in the entry, and effectively improves the working environment of the non-blasting stope.

[0080] The technical scheme provided in the embodiment has the following beneficial effects:

[0081] The sublevel return air link is arranged, and the sublevel return air link is connected with the pre-buried return air duct through the pipeline, so that the upper disc return air link 1 of the mining area is connected with each sublevel stope, the ventilation circuits in each sublevel stope are connected, the ventilation distance is shortened, and the air flow penetrating the non-blasting stope is effectively formed.

[0082] The application can make the dust generated in the cutting process of the cantilever type roadheader be discharged in time to the upper disc air return link 1 of the mining area through the air extraction pipeline, so as to enter the main air return system for treatment; at the same time, when the mining and excavation reach the position of the corresponding pre-buried air return cylinder, the mining entry can be connected with the upper disc air return link 1 of the mining area through the layered air return link, a negative pressure can be generated at the layered air return link, so that the collected dust is directly conveyed to the upper disc air return link 1 of the mining area, the ventilation distance is shortened, the air return efficiency is effectively improved, the ventilation effect in the entry is significantly improved, and the non-blasting mining site operation environment can be effectively improved.

[0083] Finally, it should be noted that in this document, relationships such as first and second, and the like, are used merely to distinguish one entity or action from another, without necessarily requiring or implying any actual relationship or order between or among such entities or actions. Moreover, the terms including, comprising, or any other variant thereof are intended to cover non-exclusive inclusion, such that processes, methods, articles, or apparatuses that include a series of elements are not required to include only those elements that are explicitly listed, or that are otherwise necessary to the process, method, article, or apparatus.

[0084] The above has described the embodiments of the application, the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, practical application, or improvement of the technology in the market, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein.

Claims

1. A return air system for a non-mechanically excavated site, characterized in that, The air return system of the non-blasting mining field comprises: an upper air return link (1) of the mining area, an air outlet end of the upper air return link (1) being communicated with a main air return system of the mining field; a layer air return link being arranged in each layer mining field of the non-blasting mining field, the layer air return link being communicated with the upper air return link (1) of the mining area; a reserved air return cylinder being arranged in each entry of each layer mining field of the non-blasting mining field, the reserved air return cylinders in each entry being communicated with each other, and the reserved air return cylinder in the first entry being communicated with the layer air return link in the layer mining field, and meanwhile, for the upper and lower adjacent two layer mining fields, the reserved air return cylinder in each entry of the upper layer mining field being communicated with the reserved air return cylinder in the corresponding entry of the lower layer mining field; a pressure-in fan (2), an air inlet pipeline being arranged in each entry of each layer mining field, and the pressure-in fan (2) being communicated with the air inlet pipeline in the corresponding entry needing to be back mined during back mining; a pull-out fan (3), an air outlet of the pull-out fan (3) being communicated with the upper air return link (1) of the mining area, and an air outlet pipeline being arranged in each entry of each layer mining field, and the pull-out fan (3) being communicated with the air outlet pipeline in the corresponding entry needing to be back mined during back mining; for the upper and lower adjacent two layer mining fields in the non-blasting mining field, the ore drawing passages of the upper and lower adjacent two layer mining fields being designed on the left and right sides of the ore body, and the ore body being back mined from the opposite directions during back mining; for the upper and lower adjacent two layer mining fields in the non-blasting mining field, the layer entries in the upper and lower adjacent two layer mining fields being arranged in a staggered form.

2. The air return system of the non-blasting mining field according to claim 1, wherein: the layer air return link in the first layer mining field of the non-blasting mining field is arranged at a position of 40m-60m of the first entry in the first layer mining field; the reserved air return cylinders in each entry of the first layer mining field of the non-blasting mining field are also arranged at the position of the layer air return link.

3. The air return system of the non-blasting mining field according to claim 2, wherein: for the upper and lower adjacent two layer mining fields in the non-blasting mining field, the horizontal interval distance between the air return link of the upper layer and the air return link of the lower layer is 30m-50m, and the vertical interval distance is 4m.

4. The air return system of the non-blasting mining field according to claim 3, wherein: the layer air return link and the first entry in the layer mining field are separated by a concrete filling retaining wall, and a communication pipeline is embedded in the concrete filling retaining wall.

5. The air return system of the non-blasting mining field according to any one of claims 1 or 4, wherein: the air inlet pipeline and the air outlet pipeline in each entry of each layer mining field are respectively arranged at the top of the mining field on both sides of the boom-type heading machine, and the air outlet of the air inlet pipeline is located at the rear end position of the air outlet of the air outlet pipeline.

6. The air return system of the non-blasting mining field according to claim 5, wherein: the air outlet of the air inlet pipeline is located 5m behind the air outlet of the air outlet pipeline.

7. The return air system of the non-mineable field according to claim 6, characterized in that: the air extraction duct is a negative pressure skeleton air duct.

8. The return air system of the non-mineable field according to claim 7, characterized in that: the air intake duct is a positive pressure soft air duct.

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