Open pit coal mine mining system and propelling method thereof

Abstract

The invention discloses an open pit coal mine mining system and a propelling method thereof. The open pit coal mine mining system comprises two coal mining units, two propelling units and a transportation system, the two coal mining units are arranged in an opposite pulling manner and are both used for continuous coal mining; the two propelling units are used for propelling the two coal mining units one by one; the feeding end of the conveying system is in butt joint with the discharging ends of the two coal mining units, and the conveying system can move in a telescopic mode. When the two propelling units propel the two coal mining units one by one, the transportation system can extend, and the feeding end of the transportation system can be in butt joint with the discharging ends of the two coal mining units correspondingly. According to the scheme, the two working faces of the open-pit coal mine mining system are arranged in an opposite-pulling mode, coal is cut through the coal mining unit on each working face and then conveyed out of the working face through the conveying system, continuous operation of mining and conveying can be achieved in the whole process, continuous mining of the open-pit coal mine can be achieved, the mining efficiency of the open-pit coal mine can be improved, and the mining cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mining, and in particular to an open-pit coal mining system and a propulsion method thereof. Background Art

[0002] Currently, open-pit coal mining is still dominated by the intermittent mining process of single-bucket excavators and truck transportation. This requires drilling and blasting before mining. The coal lumps after blasting are too large and must be crushed again in a crusher. This mining method is relatively simple, but it suffers from low production efficiency, poor safety, high dust levels, and environmental concerns. Transportation costs are also very high, especially in recent years, with the international environment becoming tense and fuel prices rising, which has significantly increased mining costs for companies.

[0003] Since 2020, the construction of intelligent coal mines has become a national priority, and continuous mining can more easily achieve automation and intelligent control. Therefore, in order to improve production efficiency and achieve intelligent control, continuous mining technology is also a breakthrough that open-pit coal mines are constantly seeking. At present, although continuous mining technologies such as bucket wheel excavators and horizontal axis drum open-pit miners in my country have achieved continuous mining to a certain extent, most of them are limited by the equipment's mining capabilities, adaptability conditions, and production capacity. Among them, the continuous mining technology of bucket wheel excavators, although it has achieved continuous mining, has limited cutting capacity and can only be adapted to the mining of soft rock and soft coal. It has poor flexibility and poor adaptability to climatic conditions. Most of them rely on imports and have high costs. The continuous mining technology of horizontal axis drum open-pit miners, although the mining equipment has strong cutting capabilities, has low cutting efficiency and low production capacity, and cannot meet the production capacity needs of open-pit mines.

[0004] Therefore, the above two equipment and processes have not been widely used in domestic open-pit coal mines; the problems existing in the existing open-pit coal mining methods, that is, how to achieve continuous mining of open-pit coal mines, how to improve mining efficiency and increase production capacity, are problems that technical personnel in this field need to solve. Summary of the Invention

[0005] In view of this, the present invention provides an open-pit coal mining system, which can realize continuous mining of open-pit coal mines, help to improve the mining efficiency of open-pit coal mines and reduce mining costs.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An open-pit coal mining system comprises: two coal mining units, two propulsion units and a transportation system;

[0008] The two coal mining units are arranged in a pulling manner and are both used for continuous coal mining;

[0009] The two propulsion units are used to propel the two coal mining units one by one;

[0010] The feed end of the transportation system is respectively docked with the discharge ends of the two coal mining groups, and the transportation system can be telescopically moved; wherein, when the two propulsion groups push the two coal mining groups one by one, the transportation system can be extended so that the feed end of the transportation system can be respectively docked with the discharge ends of the two coal mining groups.

[0011] Preferably, the two coal mining units are respectively arranged on both sides of the transportation system and are staggered;

[0012] The two propulsion units are arranged one by one at the rear sides of the two coal mining units.

[0013] Preferably, among the two coal mining units, one coal mining unit is vertically arranged on one side of the transportation system, and its discharge end is connected to the feed end of the transportation system, and the other coal mining unit is vertically arranged on the other side of the transportation system, and its discharge end is connected to the feed end of the transportation system.

[0014] Preferably, the coal mining unit comprises: a double-drum coal mining machine and a scraper conveyor;

[0015] The scraper conveyor is arranged vertically on one side of the transport system, and its discharge end is connected to the feed end of the transport system; wherein the scraper conveyor is provided with a track along the transport direction;

[0016] The double-drum coal shearer is arranged on the track of the scraper conveyor and can slide along the track; wherein the coal mined by the double-drum coal shearer can be transported to the transportation system by the scraper conveyor;

[0017] The propulsion unit is arranged at the rear side of the scraper conveyor.

[0018] Preferably, the propulsion unit comprises a plurality of propulsion devices;

[0019] The plurality of propulsion devices are respectively arranged at the rear side of the scraper conveyor and arranged along the conveying direction of the scraper conveyor, and are respectively used to propel the scraper conveyor.

[0020] Preferably, the propulsion device includes an anchoring and pulling device.

[0021] Preferably, the anchoring and pulling device comprises: a pushing frame, two pulling cylinders and an anchoring drilling rig;

[0022] The pushing frame is arranged on the rear side of the scraper conveyor;

[0023] The two pulling oil cylinders are arranged in parallel on the pushing frame, and their movable ends are capable of extension and contraction, and the cylinder bodies are capable of sliding along the extension and contraction directions of the movable ends; wherein the movable ends of the pulling oil cylinders are capable of pushing the scraper conveyor forward when extended;

[0024] The anchor drilling rig is arranged between the cylinder bodies of the two pulling and moving oil cylinders and can drill into and out of the ground.

[0025] Preferably, the two drums of the double-drum coal shearer are respectively a front drum and a rear drum;

[0026] The front roller and the rear roller are both conical spiral rollers, and their cutting end faces are inclined at a preset angle; wherein, the front roller is used for cutting top coal, and the rear roller is used for cutting bottom coal.

[0027] Preferably, the transport system comprises: a first-stage telescopic transport device, a second-stage telescopic transport device and a third-stage telescopic transport device;

[0028] The feeding end of the first-stage telescopic transport device is connected to the discharging ends of the two coal mining units respectively, and the discharging end of the first-stage telescopic transport device is connected to the feeding end of the second-stage telescopic transport device;

[0029] The discharging end of the second-stage telescopic transport device is connected to the feeding end of the third-stage telescopic transport device.

[0030] Preferably, the first-stage telescopic transport device includes: a transfer machine and a belt conveyor to move the tail of the machine;

[0031] The second-stage telescopic transport device includes a telescopic belt conveyor;

[0032] The third-stage telescopic transport device includes a displaceable belt conveyor;

[0033] The feed end of the transfer machine is connected to the discharge end of the two coal mining units respectively, and the discharge end of the transfer machine overlaps the feed end of the tail of the belt conveyor; wherein the discharge end of the transfer machine overlaps the feed end of the tail of the belt conveyor by 8-20 meters;

[0034] The feed end of the telescopic belt conveyor is connected to the discharge end of the self-moving tail of the belt conveyor, and the discharge end of the telescopic belt conveyor is connected to the feed end of the movable belt conveyor; wherein, the telescopic belt conveyor can be telescopically moved 20-100 meters.

[0035] A propulsion method for an open-pit coal mining system, using the open-pit coal mining system as described above for propulsion, the propulsion method comprising:

[0036] When the two propulsion units push the two coal mining units one by one, the first-level telescopic transport device, the second-level telescopic transport device and the third-level telescopic transport device are used in a certain order; among them, the telescopic movement of the first-level telescopic transport device is used first, followed by the telescopic movement of the second-level telescopic transport device, and finally the telescopic movement of the third-level telescopic transport device, and when the telescopic movement of the second-level telescopic transport device is used, the telescopic movement of the first-level telescopic transport device is adjusted to the shortest; when the telescopic movement of the third-level telescopic transport device is used, the telescopic movement of both the first-level telescopic transport device and the second-level telescopic transport device are adjusted to the shortest.

[0037] It can be seen from the above technical solution that the open-pit coal mining system provided by the present invention adopts the layout method of the coal mining working face of an underground coal mine, arranges two coal mining units to form opposing working faces, and the two working faces share a transportation system; that is, the two working faces of this open-pit coal mining system adopt the form of opposing layout, and each working face cuts coal through the coal mining unit, and then transports the coal out of the working face through the transportation system. The whole process can realize continuous operation of mining and transportation, and thus realize continuous mining of open-pit coal mines. At the same time, it also helps to solve the problems existing in the existing open-pit coal mining methods, that is, it helps to improve the efficiency of open-pit coal mining and reduce mining costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 A schematic diagram of the arrangement of two coal mining units provided in an embodiment of the present invention;

[0040] Figure 2 A schematic diagram of the layout of an open-pit coal mining system provided by an embodiment of the present invention;

[0041] Figure 3 A side view of the arrangement of a coal mining unit and a propulsion unit provided in an embodiment of the present invention;

[0042] Figure 4 A top view of the arrangement of the coal mining unit and the propulsion unit provided in an embodiment of the present invention.

[0043] Among them, 1 is a double-drum coal mining machine, 11 is the front drum, 12 is the rear drum, 2 is a scraper conveyor, 21 is a track, 3 is an anchoring and pulling device, 31 is a pushing frame, 32 is a pulling cylinder, 33 is an anchoring drilling rig, 4 is a transfer machine, 5 is a self-moving tail of a belt conveyor, 6 is a telescopic belt conveyor, 7 is a movable belt conveyor, and 8 is a crusher. DETAILED DESCRIPTION

[0044] Underground mining using fully mechanized mining units consisting of hydraulic supports, double-drum shearers, and scraper conveyors is a well-established method. Continuous mining can achieve a single-face production capacity of up to 15 million tons per year. However, some open-pit coal mines currently rely primarily on intermittent or semi-continuous mining. This solution, based on underground mining, applies this technology to open-pit coal mining through optimization and innovation, enabling continuous mining, improving efficiency, and reducing mining costs.

[0045] This plan draws on the layout of the coal mining working face in underground coal mines, arranging two coal shearers to pull the working faces in pairs. The two working faces share a set of transfer, crushing and transportation systems. The working faces use double-drum coal shearers to cut coal, which can cut 3-12m thick coal seams at one time, and then transport them out of the working face via scraper conveyor - transfer machine - crusher - belt conveyor self-moving machine tail - telescopic belt conveyor - movable belt conveyor. The whole process can realize continuous operation of mining, loading and transportation.

[0046] Among them, since underground coal mines are equipped with hydraulic supports, the strong support of the top plate of the hydraulic supports and the scraper conveyor can be used as a fulcrum to achieve step-by-step walking and complete the pushing and mining of the working face; while open-pit coal mines do not need to be equipped with hydraulic supports for roof support. In order to achieve stable forward movement of the equipment, a drilling rig and a push frame are arranged at the rear of the scraper conveyor, and the drilling rig is used to drill to achieve anchoring and forward movement; in addition, the coal wall of the underground coal mine is protected by a hydraulic support guard device, which can effectively prevent the occurrence of a large number of spalling. In order to prevent the collapse of the coal wall during the open-pit coal mining process, the drum of the double-drum coal mining machine can be designed to be inclined to ensure that the angle between the coal wall and the vertical direction after mining is not less than 30°.

[0047] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments 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 are within the scope of protection of the present invention.

[0048] The open-pit coal mining system provided by the embodiment of the present invention is as follows: Figure 1 and Figure 2 As shown, it includes: two coal mining units, two propulsion units and transportation system;

[0049] The two coal mining units are arranged in a pulling manner and are both used for continuous coal mining;

[0050] Two propulsion units are used to propel two coal mining units one by one;

[0051] The feed end of the transport system is docked with the discharge ends of the two coal mining units respectively, and the transport system can be telescopically moved; among them, when the two propulsion units push the two coal mining units one by one, the transport system can be extended so that the feed end of the transport system can be docked with the discharge ends of the two coal mining units respectively.

[0052] It should be noted that the two coal mining units are arranged in a pulling manner and are both used for continuous mining of coal mines; the two propulsion units can be set one by one at the rear or rear side of the two coal mining units, and are used to propel the two coal mining units one by one, so that the two coal mining units can realize pushing and mining one by one, that is, the two coal mining units can move forward steadily one by one; the feeding end of the transportation system is respectively docked with the discharging end of the two coal mining units, so that the transportation system can transport the materials (coal mines) mined by the two coal mining units out, and when the two coal mining units are pushed, in order to enable the feeding end of the transportation system to respectively maintain docking with the discharging end of the two coal mining units, that is, in order to significantly reduce the downtime and movement time of the working face, this requires that the transportation system can be telescopically movable; among them, when the two propulsion units push the two coal mining units one by one, the transportation system can extend and move, so that the feeding end of the transportation system can respectively maintain docking with the discharging end of the two coal mining units, to ensure that the transportation system can transport the materials mined by the two coal mining units out;

[0053] That is to say, the open-pit coal mining system provided by this scheme adopts the layout method of the coal mining working face of the underground coal mine, arranges two coal mining units to form a pulling working face, and the two working faces share a transportation system; that is, the two working faces of this open-pit coal mining system adopt the form of a pulling arrangement, each working face cuts coal through the coal mining unit, and then transports it out of the working face through the transportation system. The whole process can realize continuous mining and transportation, and thus realize continuous mining of open-pit coal mines. At the same time, it also helps to solve the problems existing in the existing open-pit coal mining methods, and also helps to solve the problems existing in the existing intermittent, semi-continuous or continuous mining of open-pit coal mines, that is, it helps to improve the efficiency of open-pit coal mining and reduce mining costs.

[0054] From this, it can be seen that this plan is based on underground mining and applied to open-pit coal mining through optimization and innovation, so as to realize continuous mining of open-pit coal mines, improve the mining efficiency of open-pit coal mines and reduce mining costs.

[0055] In this scheme, two coal mining units are arranged on both sides of the transport system and are staggered;

[0056] The two propulsion units are arranged one by one at the rear of the two coal mining units. Figure 2 As shown, the two coal mining units can be staggered and arranged on the left and right sides of the transportation system, and the two propulsion units can be arranged one by one on the back side or rear of the two coal mining units; in this way, the transportation system is arranged between the two coal mining units and can be shared by the two coal mining units, that is, the working faces composed of the coal mining units and the propulsion units are located on the left and right sides of the transportation system, and the two working faces are staggered front and back, and share the transportation system, which can reduce the number of equipment and improve system utilization and operation stability.

[0057] Specifically, among the two coal mining units, one coal mining unit is vertically arranged on one side of the transportation system, and its discharge end is connected to the feed end of the transportation system, and the other coal mining unit is vertically arranged on the other side of the transportation system, and its discharge end is connected to the feed end of the transportation system. Figure 2 As shown, one coal mining unit can be arranged vertically on the left side of the transportation system, and its discharge end is connected to the feed end of the transportation system, so that the materials mined by the coal mining unit can be transferred to the transportation system; another coal mining unit can be arranged vertically on the right side of the transportation system, and its discharge end is connected to the feed end of the transportation system, so that the materials mined by the coal mining unit can be transferred to the transportation system, and the two coal mining units are staggered, that is, one coal mining unit is close to the front end of the transportation system, and the other coal mining unit is closer to the front end of the transportation system; of course, the two coal mining units are arranged in this way, so that the two working faces of the open-pit coal mining system can better form a counter-pull arrangement.

[0058] Furthermore, if Figure 2 As shown, the coal mining unit includes: a double-drum coal mining machine 1 and a scraper conveyor 2;

[0059] The scraper conveyor 2 is arranged vertically on one side of the transport system, and its discharge end is connected to the feed end of the transport system; Figure 3 As shown, the scraper conveyor 2 is provided with a track 21 along the conveying direction;

[0060] like Figure 3 As shown, the double-drum coal shearer 1 is arranged on the track 21 of the scraper conveyor 2 and can slide along the track 21; wherein, the coal mined by the double-drum coal shearer 1 can be transported to the transportation system by the scraper conveyor 2;

[0061] like Figure 3 As shown, the propulsion unit is arranged at the rear side of the scraper conveyor 2 and is used to propel the scraper conveyor 2 .

[0062] It should be noted that if Figure 2As shown, each coal mining unit includes: a double-drum coal mining machine 1 and a scraper conveyor 2; the scraper conveyor 2 is vertically arranged on the left or right side of the transportation system, and its discharge end is connected to the feed end of the transportation system; wherein, as Figure 3 As shown, the scraper conveyor 2 is provided with a track 21 along the feeding direction; Figure 2 As shown, the feeding direction of the scraper conveyor 2 can be left and right, that is, the track 21 of the scraper conveyor 2 can be distributed along the left and right directions, and then the double-drum coal mining machine 1 can slide left and right along the track 21 of the scraper conveyor 2, and the coal mined by the double-drum coal mining machine 1 can fall onto the scraper conveyor 2, which is convenient for the scraper conveyor 2 to transport the coal to the transportation system; of course, the scraper conveyor 2 is not only used to transport the materials mined by the double-drum coal mining machine 1, but also provides a track for the sliding of the double-drum coal mining machine 1, and in order to ensure the steady advancement of the coal mining unit, the propulsion unit can be arranged on the rear side or rear of the scraper conveyor 2.

[0063] That is to say, the working faces composed of the double-drum coal mining machine 1, the scraper conveyor 2 and the propulsion unit are located on both sides of the transportation system, and the two working faces are staggered front and back, and the front and back distance difference is not less than the sum of the length of the head power part of the scraper conveyor 2 and the drum cutting depth; of course, the coal mining unit adopts the double-drum coal mining machine 1 to mine coal, which has high production efficiency and large production capacity.

[0064] Furthermore, the propulsion unit includes a plurality of propulsion devices;

[0065] A plurality of propulsion devices are respectively arranged at the rear side of the scraper conveyor 2 and arranged along the feeding direction of the scraper conveyor 2, and are respectively used to propel the scraper conveyor 2. Figure 4 As shown, multiple propulsion devices are respectively arranged on the rear side of the scraper conveyor 2, and are arranged in sequence along the left and right directions, and are respectively used to propel the scraper conveyor 2, so that the scraper conveyor 2 can move forward steadily, ensuring that the coal mining unit can move forward steadily; of course, multiple propulsion devices are also equivalent to multiple propulsion units of the propulsion unit.

[0066] In this program, if Figure 3 and Figure 4 As shown, the propulsion device includes an anchoring and pulling device 3; wherein, the anchoring and pulling device 3 has the characteristics of stable propulsion and convenient propulsion.

[0067] Specifically, if Figure 3 As shown, the anchoring and pulling device 3 includes: a pushing frame 31, two pulling and moving cylinders 32 and an anchoring drill 33;

[0068] The push frame 31 is arranged at the rear side of the scraper conveyor 2;

[0069] Two pulling and moving oil cylinders 32 are arranged in parallel on the pushing frame 31, and their movable ends can be extended and retracted, and the cylinder bodies can slide along the extension and retraction directions of the movable ends; wherein, the movable ends of the pulling and moving oil cylinders 32 can push the scraper conveyor 2 when extended;

[0070] like Figure 4 As shown, the anchor drill rig 33 is disposed between the cylinder bodies of the two pulling and moving oil cylinders 32 and is capable of drilling into and out of the ground.

[0071] It should be noted that if Figure 3 As shown, the push frame 31 can be arranged at the rear of the scraper conveyor 2;

[0072] Two pulling oil cylinders 32 are arranged in parallel on the push frame 31. The movable ends of the two pulling oil cylinders 32 can be extended and retracted forward and backward, and the cylinder bodies can slide in the forward and backward directions. When the movable ends of the pulling oil cylinders 32 are extended forward, the scraper conveyor 2 can be pushed forward. Figure 4 As shown, the pulling and moving oil cylinder 32 is a double-headed piston rod structure; Figure 4 As shown, the anchor drill 33 is connected between the cylinder bodies of the two pulling and moving oil cylinders 32 and can drill into and out of the ground; of course, the anchor drill 33 can slide along the cylinder bodies of the two pulling and moving oil cylinders 32 in the front-rear direction; wherein, the anchor drill 33 can realize anchoring and unanchoring by drilling and retracting the drill rod;

[0073] Among them, when the double-drum coal mining machine 1 cuts coal, the anchor drill 33 drills into the ground, anchoring the scraper conveyor 2 to ensure that the double-drum coal mining machine 1 runs smoothly on the track; when the working face advances, the anchor drill 33 remains inserted into the ground, and the front piston rod of the pulling cylinder 32 extends to advance the scraper conveyor 2 by one step. When it is pushed into place, the anchor drill 33 is withdrawn from the ground, and the cylinder body of the pulling cylinder 32 drives the anchor drill 33 forward by one step, and this is repeated to achieve the forward movement of the entire scraper conveyor 2.

[0074] Furthermore, if Figure 3 As shown, the two drums of the double-drum coal shearer 1 are the front drum 11 and the rear drum 12;

[0075] The front drum 11 and the rear drum 12 are both conical spiral drums, and their cutting end faces are inclined at a preset angle; wherein, the front drum 11 is used for cutting top coal, and the rear drum 12 is used for cutting bottom coal.

[0076] It should be noted that, as described above, the double-drum coal shearer 1 has high production efficiency and large production capacity. A pair of conical spiral drums (i.e., a front drum 11 and a rear drum 12) are arranged on one side of the double-drum coal shearer 1 body. Both conical spiral drums are tilted at a certain angle. When cutting coal, the front drum 11 cuts the top coal, while the rear drum 12 cuts the bottom coal. After cutting, the coal wall is tilted at a certain angle, ensuring that the angle between the coal wall and the vertical direction after mining is no less than 30 degrees, thus preventing coal wall spalling. Furthermore, the rear drum 12 can load the mined material onto the scraper conveyor 2, while the material mined by the front drum 11 falls onto the scraper conveyor 2 due to its own weight and is then transported to the transportation system by the scraper conveyor 2. In other words, to prevent coal wall collapse during open-pit coal mining, this solution designs the cutting end faces of the two double drums of the double-drum coal shearer 1 to be tilted, tilting the coal wall at a certain angle, ensuring that the angle between the coal wall and the vertical direction after mining is no less than 30 degrees, thus preventing coal wall spalling.

[0077] Further, the transport system includes: a first-stage telescopic transport device, a second-stage telescopic transport device, and a third-stage telescopic transport device;

[0078] The feeding end of the first-stage telescopic transport device is connected to the discharging end of the two coal mining units respectively, and the discharging end of the first-stage telescopic transport device is connected to the feeding end of the second-stage telescopic transport device;

[0079] The discharge end of the second-stage telescopic transport device is connected to the feed end of the third-stage telescopic transport device. In other words, to minimize downtime and improve operational convenience, the transport system is configured or uses a three-stage telescopic transport device; of course, the transport system can also be configured or used with more stages of telescopic transport devices.

[0080] More specifically, if Figure 2 As shown, the first-stage telescopic transport device includes: a transfer machine 4 and a belt conveyor self-moving tail 5;

[0081] The second-stage telescopic transport device includes a telescopic belt conveyor 6; wherein the telescopic belt conveyor 6 is capable of telescopic movement;

[0082] The third-stage telescopic transport device includes a displaceable belt conveyor 7;

[0083] The feed end of the transfer machine 4 is connected to the discharge end of the two coal mining units respectively, and the discharge end of the transfer machine 4 overlaps the feed end of the belt conveyor self-moving machine tail 5; wherein, the discharge end of the transfer machine 4 overlaps the feed end of the belt conveyor self-moving machine tail 5 by 8-20 meters;

[0084] The feeding end of the telescopic belt conveyor 6 is connected to the discharging end of the belt conveyor self-moving tail 5, and the discharging end of the telescopic belt conveyor 6 is connected to the feeding end of the movable belt conveyor 7; wherein, the telescopic belt conveyor 6 can be telescopically moved 20-100 meters.

[0085] It should be noted that if Figure 2 As shown, the transfer machine 4, the belt conveyor self-moving tail 5 and the telescopic belt conveyor 6 are arranged in sequence along the front and rear directions; wherein, the feed end of the transfer machine 4 is respectively connected to the discharge end of the two scraper conveyors 2, and the discharge end overlaps with the feed end of the belt conveyor self-moving tail 5, and the middle part of the transfer machine 4 may be provided with a crusher 8 for crushing the material transferred by the transfer machine 4; the feed end of the telescopic belt conveyor 6 is connected to the discharge end of the belt conveyor self-moving tail 5, and the discharge end is vertically connected to the feed end of the movable belt conveyor 7, and the telescopic belt conveyor 6 can be telescopically moved along the front and rear directions; wherein, the discharge end of the transfer machine 4 overlaps the feed end of the belt conveyor self-moving tail 5 by 8-20 meters, and the telescopic belt conveyor 6 can be telescopically moved 20-100 meters, ensuring that the telescopic movement of the transportation system can meet the propulsion requirements of the two coal mining units.

[0086] In addition, an embodiment of the present invention further provides a propulsion method for an open-pit coal mining system, which is carried out using the open-pit coal mining system described above. The propulsion method includes:

[0087] When the two propulsion units push the two coal mining units one by one, the first-level telescopic transport device, the second-level telescopic transport device and the third-level telescopic transport device are used in a certain order; among them, the telescopic movement of the first-level telescopic transport device is used first, followed by the telescopic movement of the second-level telescopic transport device, and finally the telescopic movement of the third-level telescopic transport device, and when the telescopic movement of the second-level telescopic transport device is used, the telescopic movement of the first-level telescopic transport device is adjusted to the shortest; when the telescopic movement of the third-level telescopic transport device is used, the telescopic movement of both the first-level telescopic transport device and the second-level telescopic transport device are adjusted to the shortest.

[0088] It should be noted that, as mentioned above, in order to minimize the downtime and movement time of the working surface and improve the convenience of operation, the transportation system is equipped with a three-level telescopic movement device; among them, the first-level telescopic movement is the overlap of 8-20 meters between the discharge end of the transfer machine 4 and the feed end of the belt conveyor self-moving machine tail 5, the second-level telescopic movement is the telescopic movement of the telescopic belt conveyor 6 for 20-100 meters, and the third-level telescopic movement is the telescopic movement of the movable belt conveyor 7; in addition, in order to better use the three-level telescopic movement, the use of the three-level telescopic movement has a sequence; among them, when the working surface needs to move forward as it advances, the first-level telescopic movement is given priority, followed by the second-level telescopic movement, and finally the third-level telescopic movement, that is, the first-level telescopic transport device is used first. The first step is to use the telescopic movement of the second-stage telescopic transport device, followed by the telescopic movement of the second-stage telescopic transport device, and finally the telescopic movement of the third-stage telescopic transport device; wherein, when passing through the second-stage telescopic movement, the first-stage telescopic movement is adjusted to the shortest, that is, when using the telescopic movement of the second-stage telescopic transport device, the telescopic movement of the first-stage telescopic transport device is adjusted to the shortest; when passing through the third-stage telescopic movement, the first-stage telescopic movement and the second-stage telescopic movement are adjusted to the shortest, that is, when using the telescopic movement of the third-stage telescopic transport device, the telescopic movement of the first-stage telescopic transport device and the second-stage telescopic transport device are both adjusted to the shortest. In this way, by optimizing the use process of the three-stage telescopic movement device, the three-stage telescopic movement device can play the maximum efficiency.

[0089] In addition, it should be noted that this solution provides a continuous mining system for open-pit coal mines. Its equipment draws on the layout of the coal mining working face in underground coal mines, and arranges two coal mining machines to pull the working faces in pairs. The two working faces share a set of transfer, crushing, and belt conveyor systems. The working face uses a double-drum coal mining machine to cut coal, which can cut 3-12m thick coal seams at one time and transport them out of the working face via a scraper conveyor-transfer machine-crusher-telescopic belt conveyor-removable belt conveyor. The entire process can achieve continuous mining, loading, and transportation.

[0090] Among them, the equipment of the continuous mining system mainly includes: two double-drum coal mining machines, two scraper conveyors, several sets of anchoring and pulling devices, transfer machines, crushers, self-moving tail belt conveyors, telescopic belt conveyors, movable belt conveyors, etc.

[0091] The equipment is arranged from inside the pit to the coal bunker outside the pit. The cutting, loading, crushing and transportation are all continuous during the operation process, with low energy consumption, high mining efficiency, low environmental pollution and large production capacity. Its core mining equipment adopts a double-drum coal mining machine with high production efficiency and large production capacity. A double-conical spiral drum is arranged on one side of the fuselage. The drum is tilted at a certain angle. When cutting coal, the front drum cuts the top coal and the rear drum cuts the bottom coal. After cutting, the coal wall is tilted at a certain angle to avoid coal wall spalling. The rear drum can load the material onto the scraper conveyor, and then transport it to the ground coal bunker through the transfer machine, crusher, telescopic belt conveyor, movable belt conveyor, etc. At the same time, there is no perforation and blasting link in the operation process, which reduces environmental pollution and damage to the slope. It is a safe, efficient and green continuous mining process.

[0092] The open-pit longwall continuous mining method (process) described in this plan does not require drilling and blasting links. The cutting, loading, crushing and transportation operations are all continuous. It has low energy consumption, high mining efficiency, low environmental pollution and high production capacity. It is a safe, efficient and green mining method (process); the two working faces share transfer, crushing, telescopic belt and other equipment, which can reduce the number of equipment and improve system utilization and operational stability; the transportation system is equipped with a three-level telescopic moving device, which greatly reduces the downtime and movement time of the working face and improves the convenience of operation.

[0093] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0094] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An open-pit coal mining system, characterized in that: include: two coal mining units, two propulsion units and transport systems; The two coal mining units are arranged in a pulling manner and are both used for continuous coal mining; The two propulsion units are used to propel the two coal mining units one by one; The feed end of the transportation system is respectively docked with the discharge ends of the two coal mining groups, and the transportation system can be telescopically moved; wherein, when the two propulsion groups push the two coal mining groups one by one, the transportation system can be extended so that the feed end of the transportation system can be respectively docked with the discharge ends of the two coal mining groups.

2. The open-pit coal mining system according to claim 1, characterized in that: The two coal mining units are respectively arranged on both sides of the transportation system and are staggered; The two propulsion units are arranged one by one at the rear sides of the two coal mining units.

3. The open-pit coal mining system according to claim 2, characterized in that: Among the two coal mining units, one coal mining unit is vertically arranged on one side of the transportation system, and its discharge end is connected to the feed end of the transportation system; the other coal mining unit is vertically arranged on the other side of the transportation system, and its discharge end is connected to the feed end of the transportation system.

4. The open-pit coal mining system according to claim 3, characterized in that: The coal mining machine group comprises: a double-drum coal mining machine (1) and a scraper conveyor (2); The scraper conveyor (2) is arranged vertically on one side of the transport system, and its discharge end is connected to the feed end of the transport system; wherein the scraper conveyor (2) is provided with a track (21) along the transport direction; The double-drum coal mining machine (1) is arranged on the track (21) of the scraper conveyor (2) and can slide along the track (21); wherein the coal mined by the double-drum coal mining machine (1) can be transported to the transportation system by the scraper conveyor (2); The propulsion unit is arranged on the rear side of the scraper conveyor (2).

5. The open-pit coal mining system according to claim 4, characterized in that: The propulsion unit includes a plurality of propulsion devices; The plurality of propulsion devices are respectively arranged on the rear side of the scraper conveyor (2), and are arranged along the conveying direction of the scraper conveyor (2), and are respectively used to propel the scraper conveyor (2).

6. The open-pit coal mining system according to claim 5, characterized in that: The propulsion device comprises an anchoring and pulling device (3).

7. The open-pit coal mining system according to claim 6, characterized in that: The anchoring and pulling device (3) comprises: a pushing frame (31), two pulling and moving oil cylinders (32) and an anchoring drilling rig (33); The pushing frame (31) is arranged on the rear side of the scraper conveyor (2); The two pulling oil cylinders (32) are arranged in parallel on the pushing frame (31), and their movable ends are capable of extension and contraction, and the cylinder bodies are capable of sliding along the extension and contraction directions of the movable ends; wherein the movable ends of the pulling oil cylinders (32) are capable of pushing the scraper conveyor (2) forward when extended; The anchor drilling rig (33) is arranged between the cylinder bodies of the two pulling oil cylinders (32) and is capable of drilling into and out of the ground.

8. The open-pit coal mining system according to claim 4, characterized in that: The two drums of the double-drum coal mining machine (1) are respectively a front drum (11) and a rear drum (12); The front roller (11) and the rear roller (12) are both conical spiral rollers, and their cutting end faces are inclined at a preset angle; wherein the front roller (11) is used for cutting top coal, and the rear roller (12) is used for cutting bottom coal.

9. The open-pit coal mining system according to claim 3, characterized in that: The transport system comprises: a first-stage telescopic transport device, a second-stage telescopic transport device and a third-stage telescopic transport device; The feeding end of the first-stage telescopic transport device is connected to the discharging ends of the two coal mining units respectively, and the discharging end of the first-stage telescopic transport device is connected to the feeding end of the second-stage telescopic transport device; The discharging end of the second-stage telescopic transport device is connected to the feeding end of the third-stage telescopic transport device.

10. The open-pit coal mining system according to claim 9, characterized in that: The first-stage telescopic transport device comprises: a transfer machine (4) and a belt conveyor self-moving tail (5); The second-stage telescopic transport device comprises a telescopic belt conveyor (6); The third-stage telescopic transport device comprises a displaceable belt conveyor (7); The feed end of the transfer machine (4) is connected to the discharge ends of the two coal mining units respectively, and the discharge end of the transfer machine (4) overlaps the feed end of the belt conveyor self-moving machine tail (5); wherein the discharge end of the transfer machine (4) overlaps the feed end of the belt conveyor self-moving machine tail (5) by 8-20 meters; The feed end of the telescopic belt conveyor (6) is connected to the discharge end of the belt conveyor self-moving tail (5), and the discharge end of the telescopic belt conveyor (6) is connected to the feed end of the movable belt conveyor (7); wherein the telescopic belt conveyor (6) can be telescopically moved 20-100 meters.

11. A propulsion method for an open-pit coal mining system, characterized in that: Propulsion is performed using the open-pit coal mining system according to claim 9 or claim 10, the propulsion method comprising: When the two propulsion units push the two coal mining units one by one, the first-level telescopic transport device, the second-level telescopic transport device and the third-level telescopic transport device are used in a certain order; among them, the telescopic movement of the first-level telescopic transport device is used first, followed by the telescopic movement of the second-level telescopic transport device, and finally the telescopic movement of the third-level telescopic transport device, and when the telescopic movement of the second-level telescopic transport device is used, the telescopic movement of the first-level telescopic transport device is adjusted to the shortest; when the telescopic movement of the third-level telescopic transport device is used, the telescopic movement of both the first-level telescopic transport device and the second-level telescopic transport device are adjusted to the shortest.

Images