Method for improving pushing difficulty under strong mine pressure and pushing process thereof

Abstract

The present application relates to the technical field of coal mining process, in particular to a pushing and pulling process during coal mining, and more particularly to a method for improving the difficulty of pushing and pulling under strong mine pressure and a pushing and pulling process thereof. The present application aims to provide a method for improving the difficulty of pushing and pulling under strong mine pressure, that is, when the pushing and pulling is difficult, a double-drum shearer is used to achieve the following method: the double-drum shearer returns along the original route, the rear drum of the double-drum shearer is normally rotated to sweep the bottom coal while the front drum is shielded, and the rocker arm connected with the front drum is pressed down until the front drum forms a downward pressure on the part of the scraper conveyor corresponding to the front drum. Due to the relationship between the force and the counterforce, the part of the scraper conveyor corresponding to the rear of the front drum is subjected to an upward force, thereby achieving the automatic lifting effect on the scraper conveyor. The method is simple and has high pushing and pulling efficiency.

Description

Technical Field

[0001] This invention relates to the field of coal mining technology, and in particular to the pushing conveyor process during coal mining, specifically a method and lifting process for improving the difficulty of pushing conveyors under strong mine pressure. Background Technology

[0002] During the mining process of a coal mine working face, strong mine pressure often occurs due to factors such as the lateral support pressure formed by the uncollapsed overhangs in the adjacent goaf, the support pressure from the advanced mining of the working face, and the pressure from the coal pillars left over the main roadway. This causes the working face to experience floor heave, which in turn leads to severe tilting of the scraper conveyor and difficulty in pushing the conveyor (the conveyor itself is the scraper conveyor). This seriously affects the normal progress of the coal mining face.

[0003] There are two existing methods to solve the problem of pushing the conveyor: 1) Using auxiliary jacks and support moving jacks to push the scraper conveyor together. This method requires the preparation of auxiliary tools and the connection of the auxiliary jacks to the hydraulic circuit, which takes a long time. After use, the auxiliary jacks must be retracted before normal coal mining can proceed. The operation is cumbersome and the pushing efficiency is low. 2) Using the lifting process, that is, lifting the scraper conveyor and placing wooden blocks under the scraper conveyor before pushing it. This method is cumbersome, has low pushing efficiency, and requires operators to enter the machine track and coal face to work, which is unsafe. Therefore, there is an urgent need for a method that is simple to operate, safe, and can improve the difficulty of pushing the conveyor under strong mine pressure. Summary of the Invention

[0004] The purpose of this invention is to provide a method and process for improving the difficulty of pushing the conveyor under strong ore pressure.

[0005] This invention is achieved using the following technical solution: a method to improve the difficulty of pushing the conveyor under strong mine pressure. When the difficulty of pushing the conveyor occurs (as is known to those skilled in the art, the difficulty of pushing the conveyor occurs when the double-drum coal miner has finished cutting the coal and the difficulty of pushing the conveyor is found during the pre-pushing process), the double-drum coal miner is used to achieve the following: the double-drum coal miner returns along the original path. When returning along the original path, the rear drum of the double-drum coal miner rotates normally to sweep the bottom coal, the front drum is shielded, and the rocker arm connected to the front drum is pressed down until the front drum forms a downward pressure on the part of the scraper conveyor corresponding to the front drum. Due to the relationship between action and reaction forces, the part of the scraper conveyor corresponding to the rear of the front drum is subjected to an upward force, thereby completing the automatic lifting function of the scraper conveyor.

[0006] Working Principle: As is known to those skilled in the art, the double-drum coal mining machine is located on a scraper conveyor. The double-drum coal mining machine is connected to the scraper conveyor via guide shoes of the double-drum coal mining machine and the fixed toothed rail of the scraper conveyor. The double-drum coal mining machine drives the guide shoes to move back and forth on the scraper conveyor via a traction motor. The front drum (the one located at the front and used for cutting the top coal when the double-drum coal mining machine is moving) and the rear drum (the one located at the rear and used for cutting the bottom coal when the double-drum coal mining machine is moving) sweep the top and bottom coal and cut the coal by raising and lowering the corresponding rocker arms via left and right cutting motors and height adjustment oil pumps. When there is difficulty in pushing the conveyor, the front drum shields the top and bottom coal. The rocker arm presses down until the front roller forms a downward pressure F1 on the part of the scraper conveyor corresponding to the front roller. Due to the relationship between action and reaction forces, the part of the scraper conveyor corresponding to the rear of the front roller is subjected to an upward force F2. This upward force can lift the part of the scraper conveyor corresponding to the rear of the front roller, achieving an automatic lifting process. At the same time, the rear roller rotates normally to sweep the ground, cleaning as much of the machine path as possible. While cleaning the machine path, the lifting of the scraper conveyor will also clean the swept floating coal to the bottom of the scraper conveyor, thereby further improving the problem of difficult pushing of the conveyor under strong mine pressure. At this time, pushing the conveyor will be much easier.

[0007] Furthermore, when the double-drum coal mining machine adopts a unidirectional coal cutting and unidirectional push-conveyor mining process, when the double-drum coal mining machine adopts a bidirectional coal cutting process, the push-conveyor direction is also opposite during bidirectional coal cutting, causing the conveyors to bite and squeeze each other, resulting in mutual pressure. Therefore, the coal cutting process is changed to a unidirectional coal cutting and unidirectional push-conveyor process to release the biting and squeezing between the conveyors, so that the conveyors no longer squeeze each other, which to a certain extent also improves the problem of difficulty in pushing the conveyor under strong mine pressure.

[0008] A lifting process to improve the difficulty of pushing the conveyor under strong mine pressure is proposed. This lifting process is achieved by using a double-drum coal mining machine. While the double-drum coal mining machine is moving normally relative to the scraper conveyor, the rear drum of the double-drum coal mining machine rotates normally to sweep the bottom coal, the front drum is shielded, and the rocker arm connected to the front drum is pressed down until the front drum forms a downward pressure on the part of the scraper conveyor corresponding to the front drum. Due to the relationship between action and reaction forces, the part of the scraper conveyor corresponding to the rear of the front drum is subjected to an upward force, thereby completing the lifting effect of the scraper conveyor.

[0009] Working principle: The front roller shields and presses down the rocker arm connected to the front roller until the front roller forms a downward pressure F1 on the part of the scraper conveyor corresponding to the front roller. Due to the relationship between action and reaction forces, the part of the scraper conveyor corresponding to the rear of the front roller is subjected to an upward force F2. This upward force can lift the part of the scraper conveyor corresponding to the rear of the front roller, achieving an automatic lifting process. At the same time, the rear roller rotates normally to sweep the ground, cleaning as much of the machine path as possible. While cleaning the machine path, the lifting of the scraper conveyor will also clean the swept floating coal to the bottom of the scraper conveyor, thereby further improving the problem of difficult pushing of the conveyor under strong mine pressure. At this time, pushing the conveyor will be much easier.

[0010] The beneficial effects of this invention are as follows: This method can cleverly achieve conveyor lifting using only existing equipment, namely a double-drum coal mining machine. It is simple to operate, has high conveyor pushing efficiency and good safety, and ensures the normal progress of coal mining work. Attached Figure Description

[0011] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of a double-drum coal mining machine.

[0014] Figure 2 This is a schematic diagram showing the usage state when a double-drum coal mining machine is used to implement the conveyor process.

[0015] In the diagram: 1-front roller, 2-rear roller, 3-rocker arm, 4-guide slipper, 5-scraper conveyor. Implementation

[0016] To better understand the above-mentioned objectives, features, and advantages of the present invention, the solutions of the present invention will be further described below. It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other.

[0017] In this description, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. It should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joint" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0018] Many specific details are set forth in the following description in order to provide a full understanding of the invention, but the invention may also be practiced in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the invention, and not all embodiments.

[0019] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0020] like Figure 2 As shown, a method to improve the difficulty of pushing the conveyor under strong mine pressure is as follows: When the difficulty of pushing the conveyor occurs (as is known to those skilled in the art, the difficulty of pushing the conveyor occurs when the double-drum coal miner has finished cutting the coal and the difficulty of pushing the conveyor is found during the pre-pushing process), the double-drum coal miner is used to achieve the following: the double-drum coal miner returns along the original path. When returning along the original path, the rear drum 2 of the double-drum coal miner rotates normally to sweep the bottom coal, the front drum 1 is shielded, and the rocker arm 3 connected to the front drum 1 is pressed down until the front drum 1 forms a downward pressure on the part of the scraper conveyor 5 corresponding to the front drum 1. Due to the relationship between action and reaction forces, the part of the scraper conveyor 5 corresponding to the rear of the front drum 1 is subjected to an upward force, thereby completing the automatic lifting function of the scraper conveyor 5.

[0021] Working principle: well known to those skilled in the art, such as Figure 1 As shown, the double-drum coal mining machine is located on the scraper conveyor 5. The double-drum coal mining machine and the scraper conveyor 5 are connected by the guide slipper 4 of the double-drum coal mining machine and the fixed toothed rail of the scraper conveyor 5. The double-drum coal mining machine drives the guide slipper 4 to move back and forth on the scraper conveyor 5 through the traction motor. The front drum 1 (the one located at the front and used for cutting the top coal when the double-drum coal mining machine is moving) and the rear drum 2 (the one located at the rear and used for cutting the bottom coal when the double-drum coal mining machine is moving) sweep the top and bottom coal and cut the coal through the corresponding rocker arms 3 raised and lowered by the left and right cutting motors and the height adjustment oil pump. When there is difficulty in pushing the conveyor, such as Figure 2As shown, the front roller 1 shields and presses down the rocker arm 3 connected to the front roller 1 until the front roller 1 forms a downward pressure F1 on the part of the scraper conveyor 5 corresponding to the front roller 1. Due to the relationship between action and reaction forces, the part of the scraper conveyor 5 corresponding to the rear of the front roller 1 is subjected to an upward force F2. This upward force F2 can lift the part of the scraper conveyor 5 corresponding to the rear of the front roller 1, achieving an automatic lifting process. At the same time, the rear roller 2 rotates normally to sweep the ground, cleaning the machine path as much as possible. While cleaning the machine path, the sweeping floating coal will also be cleaned to the bottom of the scraper conveyor 5 due to the lifting of the scraper conveyor 5, thereby further improving the problem of difficult pushing of the conveyor under strong mine pressure. At this time, pushing the conveyor will be much easier.

[0022] In practice, if the double-drum coal mining machine still has difficulty pushing the conveyor after one lifting operation, the lifting operation should be repeated until the conveyor can be pushed normally.

[0023] In practice, the double-drum coal mining machine adopts a unidirectional coal cutting and unidirectional push-conveyor mining process. When the double-drum coal mining machine adopts a bidirectional coal cutting process, the push-conveyor direction is also opposite during bidirectional coal cutting, causing the chutes to bite and squeeze each other, resulting in mutual pressure. Therefore, the coal cutting process is changed to a unidirectional coal cutting and unidirectional push-conveyor process to release the biting and squeezing between the chutes, so that the chutes no longer squeeze each other, which to a certain extent also improves the problem of difficulty in pushing the conveyor under strong mine pressure.

[0024] In practical implementation, taking the application of this method to the 8102 working face of Tongxin Mine as an example, during each cycle of pressure, the ordinary conveyor method can only cut 3 coal cuts per day, while the rapid conveyor method can cut 6 coal cuts per day. Calculated at a yield of 6,000 tons per cut, an additional 18,000 tons of raw coal can be extracted daily.

[0025] A lifting process to improve the difficulty of pushing the conveyor under strong mine pressure is proposed. This lifting process is achieved by using a double-drum coal mining machine. While the double-drum coal mining machine moves normally relative to the scraper conveyor 5, the rear drum 2 of the double-drum coal mining machine rotates normally to sweep the bottom coal, the front drum 1 is shielded, and the rocker arm 3 connected to the front drum 1 is pressed down until the front drum 1 forms a downward pressure on the corresponding part of the scraper conveyor 5. Due to the action-reaction relationship, the part of the scraper conveyor 5 corresponding to the rear of the front drum 1 is subjected to an upward force, thus lifting the scraper conveyor 5. In specific implementation, if pushing the conveyor still has difficulty after one lifting process, the lifting process is repeated until pushing can be performed normally.

[0026] Working principle: The front roller 1 shields and presses down the rocker arm 3 connected to the front roller 1 until the front roller 1 forms a downward pressure F1 on the part of the scraper conveyor 5 corresponding to the front roller 1. Due to the relationship between action and reaction forces, the part of the scraper conveyor 5 corresponding to the rear of the front roller 1 is subjected to an upward force F2. This upward force can lift the part of the scraper conveyor 5 corresponding to the rear of the front roller 1, achieving an automatic lifting process. At the same time, the rear roller 2 rotates normally to sweep the ground, cleaning the machine path as much as possible. While cleaning the machine path, the sweeping floating coal will also be cleaned to the bottom of the scraper conveyor 5 due to the lifting of the scraper conveyor 5, thereby further improving the problem of difficult pushing of the conveyor under strong mine pressure. At this time, pushing the conveyor will be much easier.

[0027] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the present invention. Although detailed descriptions have been provided with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments, and they should all be covered within the protection scope of the claims.

Claims

1. A method for improving the difficulty of pushing under strong rock pressure, characterized in that, When the push and pull is difficult, the double drum shearer is used to return to the original path, and the front drum (1) of the double drum shearer is shielded and the rocker arm (3) connected with the front drum (1) is pressed down until the front drum (1) forms a downward pressure on the corresponding part of the scraper conveyor (5), due to the relationship between force and counterforce, the corresponding part of the scraper conveyor (5) behind the front drum (1) is subjected to an upward force, thereby completing the automatic lifting of the scraper conveyor (5), and the rear drum rotates normally to clean the coal channel as much as possible, and the cleaning of the coal channel will also clean the swept floating coal to the bottom of the scraper conveyor due to the lifting of the scraper conveyor, thereby improving the problem of difficult push and pull under strong mine pressure.

2. The method for improving the difficulty of push-slope under strong mine pressure according to claim 1, characterized in that, When the double drum shearer still has push and pull difficulty after one lifting, the lifting is repeated until the push and pull is normal.

3. The method for improving the difficulty of pushback under strong rock pressure according to claim 1 or 2, characterized in that, The double drum shearer uses one-way coal cutting and one-way push and pull technology when mining.

4. A hoisting process for improving the difficulty of push hoisting under strong rock pressure, characterized in that, The lifting technology is realized by the double drum shearer, that is, the front drum (1) of the double drum shearer is shielded and the rocker arm (3) connected with the front drum (1) is pressed down until the front drum (1) forms a downward pressure on the corresponding part of the scraper conveyor (5), due to the relationship between force and counterforce, the corresponding part of the scraper conveyor (5) behind the front drum (1) is subjected to an upward force, thereby completing the lifting of the scraper conveyor (5), and the rear drum rotates normally to clean the coal channel as much as possible, and the cleaning of the coal channel will also clean the swept floating coal to the bottom of the scraper conveyor due to the lifting of the scraper conveyor, thereby improving the problem of difficult push and pull under strong mine pressure.

5. The hoisting process for improving the difficulty of push hoisting under the action of strong rock pressure according to claim 4, characterized in that, When the double drum shearer still has push and pull difficulty after one lifting, the lifting is repeated until the push and pull is normal.

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