An adjustable tilting arm coal mining machine
By adding an angle adjustment mechanism to the rocker arm coal mining machine, the inclined cutting of the drum is achieved, which solves the problem of spalling during high mining in open-pit coal mines and improves safety and production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHENGZHOU COAL MINING MACHINERY (GRP) CO LTD
- Filing Date
- 2025-07-03
- Publication Date
- 2026-07-31
AI Technical Summary
The existing rocker arm coal mining machine cannot adjust the inclination angle of the cutting coal face, which leads to frequent spalling during the high-level mining process in open-pit coal mines, affecting safety and efficiency.
An inclination adjustment mechanism is added to the rocker arm coal mining machine. The movable end of the inclination adjustment mechanism drives the rocker arm to swing around the first horizontal direction, so as to realize the inclination cutting of the drum and adapt to different coal wall inclination angle requirements.
It effectively prevents coal wall spalling, improves safety and production efficiency, and reduces equipment damage and operating costs.
Smart Images
Figure CN224579331U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of coal mining technology, and in particular to a rocker arm coal mining machine with adjustable tilt angle. Background Technology
[0002] Currently, coal face spalling occurs during high-level open-pit coal mining, which has numerous adverse effects on safety and efficiency. Firstly, during spalling, coal face collapses can cause coal chunks or rocks to fall and bury workers, resulting in serious accidents and causing immense suffering and loss to employees and their families. Secondly, collapsed coal and rock can damage mining equipment such as coal mining machines, loaders, and transport vehicles, leading to equipment malfunctions or damage, affecting normal production operations, and increasing the cost and time of equipment repair. Thirdly, the coal dust generated by spalling severely pollutes the working environment, reduces visibility, and increases the risk of occupational diseases such as pneumoconiosis for operators. Scattering incidents can affect equipment heat dissipation and operational performance, potentially leading to gas accumulation and increasing the risk of gas explosions and other safety accidents. Simultaneously, they have numerous adverse effects on profitability. After a scattering incident, time is required for on-site cleanup, equipment repair, and safety hazard investigation, resulting in mining operations being interrupted, production efficiency significantly reduced, and impacting coal output and the company's economic benefits. Furthermore, scattering damages equipment and coal face infrastructure, requiring substantial investment in repair and replacement, increasing the company's production costs. In addition, during the production stoppage caused by scattering, the company still needs to pay employee wages and equipment depreciation, further increasing operating costs.
[0003] The current prevention of spalling in high-extraction open-pit coal mines is mainly achieved through optimizing mining design, strengthening coal face support, improving mining technology, and applying monitoring and early warning technologies. However, none of these technologies can fundamentally solve the problem. The root cause of spalling lies in the change of the cutting angle of the coal face. For example, cutting the coal face in a straight line may cause spalling. However, the cutting angle of the existing rocker arm coal mining machine cannot be adjusted, so it cannot achieve inclined cutting. Thus, the problem of spalling during high-extraction coal mining is difficult to solve. Utility Model Content
[0004] In view of this, the present invention provides a rocker arm coal mining machine with adjustable tilt angle, which can achieve inclined cutting and help solve the problem of spalling during high coal mining.
[0005] To achieve the above objectives, this utility model provides the following technical solution:
[0006] An adjustable tilt angle rocker arm coal mining machine includes: a coal mining machine body, a rocker arm and a drum, wherein the rocker arm is disposed on the coal mining machine body, the drum is disposed on the free end of the rocker arm, and the machine also includes a tilt angle adjustment mechanism.
[0007] The tilt adjustment mechanism is disposed on the main body of the coal mining machine, and the rocker arm is disposed on the movable end of the tilt adjustment mechanism. The movable end of the tilt adjustment mechanism is used to drive the rocker arm to swing around a first horizontal direction; wherein, the first horizontal direction is perpendicular to the horizontal axis of the drum.
[0008] Preferably, the movable end of the tilt adjustment mechanism is an output shaft, and it is capable of swinging around the first horizontal direction.
[0009] Preferably, the tilt adjustment mechanism includes a first swing cylinder.
[0010] Preferably, the rocker arm includes: a rocker arm and a height adjustment mechanism;
[0011] The up-down adjustment mechanism is located at the movable end of the tilt adjustment mechanism;
[0012] The rocker arm is disposed at the movable end of the up-down adjustment mechanism, and the movable end of the up-down adjustment mechanism is used to drive the rocker arm to swing around a second horizontal direction; wherein, the second horizontal direction is parallel to the horizontal axis of the roller;
[0013] The roller is located at the free end of the rocker arm.
[0014] Preferably, the movable end of the up-down adjustment mechanism is an output shaft, and it can swing around the second horizontal direction.
[0015] Preferably, the up-and-down adjustment mechanism includes a second swing cylinder.
[0016] Preferably, the rocker arm further includes a rotary seat;
[0017] The rotary seat is located at the movable end of the tilt adjustment mechanism;
[0018] The rocker arm is swayable around the second horizontal direction and is mounted on the rotary seat;
[0019] The second swing cylinder is disposed on the rotary seat and is used to drive the rocker arm to swing around the second horizontal direction.
[0020] Preferably, the rocker arm is provided with an ear piece;
[0021] The first side end of the rotary seat is provided with a rotary groove, and the lug of the rocker arm can swing around the second horizontal direction and is disposed in the rotary groove of the rotary seat.
[0022] The second swing cylinder is located at the second side end of the rotary seat, and its output shaft passes through the rotary groove and is connected to the lug of the rocker arm.
[0023] The third side end of the rotary seat is located at the movable end of the tilt adjustment mechanism; wherein the first side end of the rotary seat is adjacent to the second side end, and the first side end is opposite to the third side end.
[0024] As can be seen from the above technical solution, the tilt-adjustable rocker arm coal mining machine provided by this utility model adds a tilt-adjustment mechanism between the main body of the coal mining machine and the rocker arm. The movable end of the tilt-adjustment mechanism drives the rocker arm to swing around the first horizontal direction, which in turn drives the drum to swing around the first horizontal direction perpendicular to its horizontal axis. This allows the tilt angle of the drum cutting the coal surface to be adjusted, thus enabling the rocker arm coal mining machine to achieve tilted cutting. In this way, the coal wall can form a certain tilt angle during cutting, which can prevent the flaking caused by the straight face, thereby helping to avoid the problem of coal wall flaking during high mining heights, especially in open-pit coal mines with ultra-high mining heights. Attached Figure Description
[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0026] Figure 1 A front view of the structure of the rocker arm coal mining machine provided in an embodiment of this utility model;
[0027] Figure 2 A top view of the structure of the rocker arm coal mining machine provided in this embodiment of the utility model;
[0028] Figure 3 This is a schematic diagram of the roller after adjusting its tilt angle, provided in an embodiment of the present invention.
[0029] Wherein, 1 is the drum, 2 is the rocker arm, 2.1 is the lug, 3 is the second swing cylinder, 4 is the rotary seat, 4.1 is the rotary groove, 4.2 is the first side end, 4.3 is the second side end, 4.4 is the third side end, 5 is the first swing cylinder, 6 is the main body of the coal mining machine, 7 is the first horizontal direction, 8 is the second horizontal direction, and 9 is the horizontal axis. Detailed Implementation
[0030] Regarding the aforementioned background technology, it should also be noted that spalling is relatively frequent in existing open-pit coal mines with high mining faces. The manifestations, causes, and impacts of spalling are explained below:
[0031] (1) The forms of expression of the bang
[0032] Localized coal face collapse: In open-pit mining faces with large elevations, blocky or sheet-like coal masses may detach from the coal face. This is usually due to the development of joints and fissures in localized areas of the coal face. Under the influence of mining stress and gravity, the coal in these areas loses stability and collapses. The size of the collapsed coal blocks varies, ranging from as small as tens of centimeters to as large as several cubic meters.
[0033] Overall coal face instability: When the mining height is large and the coal face stability is poor, the coal face may tilt, slide, or even collapse entirely towards the goaf. This situation is often accompanied by large-scale spalling of the coal face, which can seriously affect coal mining operations.
[0034] (2) Common causes of piecemeal gang
[0035] Complex geological conditions: The occurrence conditions of coal seams have a significant impact on spalling. If the coal seam dips sharply, the coal body tends to slide down the dip direction under gravity, easily leading to spalling. Simultaneously, if the coal is soft and has well-developed joints and fissures, the integrity and strength of the coal face will decrease, also increasing the likelihood of spalling. Furthermore, near geological structures such as faults and folds, the coal body is subjected to tectonic stress, altering its mechanical properties and making spalling more likely.
[0036] Inappropriate design of mining height and slope angle: The mining height of open-pit high mining faces is relatively large, increasing the exposed height of the coal face and reducing its own stability. If the slope angle is designed to be too large, it will increase the lateral pressure on the coal face, further weakening its stability and thus causing spalling.
[0037] Impact of Mining Technology: The cutting method, speed, and parameters of coal mining equipment directly affect the stability of the coal face. For example, if the cutting speed or depth is too high when the coal mining machine cuts the coal face, it will generate significant impact and vibration, disrupting the original stress balance and leading to spalling. Furthermore, unreasonable blasting parameters, such as excessive explosives or improper borehole arrangement, can also excessively damage the coal face, increasing the risk of spalling.
[0038] Inadequate support and protection measures: If the coal face support is insufficient, such as due to unreasonable length or spacing of anchor bolts and cables, or poor quality of support materials, it will be unable to effectively limit the deformation and displacement of the coal face, easily leading to spalling. Furthermore, if the coal face is not protected in a timely manner during mining, such as by not installing coal retaining plates or protective netting, spalling cannot be prevented.
[0039] (3) The impact of the gang
[0040] Safety Threats: Rockfalling can pose a serious threat to the lives of on-site workers, easily causing casualties. Furthermore, rockfalling can trigger other safety accidents, such as excessive gas levels and coal dust explosions, further endangering the safety of the entire mining area.
[0041] Reduced production efficiency: Spalling can cause mining operations to be interrupted, requiring time for coal face repair, equipment cleaning and maintenance. In addition, the stability of the coal face after spalling is poor. To ensure safety, subsequent mining operations may need to be slower or special mining techniques may be adopted, all of which will lead to a significant decrease in production efficiency.
[0042] Resource loss: During the coal seam slab spalling process, some coal will be buried under the collapsed coal gangue, making it difficult to recover and resulting in a waste of coal resources. In addition, the spalling process may also damage the integrity of the coal seam, affecting the quality and recovery rate of subsequent coal mining.
[0043] The prevention of large-scale coal mining and spalling in existing open-pit coal mines is mainly achieved through optimizing mining design, strengthening coal wall support, improving mining technology, and applying monitoring and early warning technologies. Details are as follows:
[0044] Regarding mining height and slope angle, the mining height and slope angle are scientifically calculated and rationally determined based on the geological conditions of the coal seam, including coal hardness, coal seam dip angle, and roof and floor lithology. This avoids excessive mining height leading to coal wall instability and excessively steep slope angles increasing lateral pressure on the coal wall.
[0045] In terms of mining area layout, factors such as geological structure and coal seam occurrence are comprehensively considered to rationally divide mining areas, so that coal mining operations can avoid areas with complex geological conditions, such as faults and fracture zones. At the same time, the layout direction of the coal mining face is optimized to reduce the adverse effects of mining stress on the coal face.
[0046] For coal face support, bolt and cable anchoring is used. Bolts and cables are arranged on the coal face at specific intervals and angles. The anchoring force of the bolts and cables connects the shallow coal seam to the deeper, stable coal seam, improving the overall stability of the coal face. For areas with fractured coal seams, the density and length of the bolts and cables can be appropriately increased.
[0047] In addition, strengthen the management of blasting operations. For open-pit coal mines that require blasting, strictly control parameters such as the amount of explosives used, the spacing between blast holes, the row spacing, and the depth. Adopt reasonable blasting methods, such as smooth blasting and pre-splitting blasting, to reduce the damage to the coal face caused by blasting.
[0048] None of the above technologies can fundamentally solve the problem. The root cause of coal spalling is the change in the cutting angle of the coal face. Different coal faces have different requirements for spalling. This solution is designed to meet various spalling angle requirements. The cutting angle can be freely changed to adapt to actual working conditions.
[0049] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0050] The tilt-adjustable rocker arm coal mining machine provided in this embodiment of the utility model, such as Figure 1 As shown, it includes: a coal mining machine body 6, a rocker arm and a drum 1. The rocker arm is located on the coal mining machine body 6, and the drum 1 is located on the free end of the rocker arm. The rocker arm coal mining machine with adjustable tilt angle also includes a tilt angle adjustment mechanism.
[0051] The tilt adjustment mechanism is located on the main body 6 of the coal mining machine, and the rocker arm is located at the movable end of the tilt adjustment mechanism. The movable end of the tilt adjustment mechanism is used to drive the rocker arm to swing around the first horizontal direction 7; wherein, for example Figure 2 As shown, the first horizontal direction 7 is perpendicular to the horizontal axis 9 of the roller 1.
[0052] It should be noted that the main body 6 of the coal mining machine serves as the main body of the rocker arm coal mining machine. The rocker arm of the rocker arm can swing back and forth around the second horizontal direction 8 to drive the drum 1 to swing up and down, meeting the different mining height requirements of the drum 1, thus enabling the drum 1 to adapt to changes in mining height. The second horizontal direction 8 is parallel to the horizontal axis 9 of the drum 1. Furthermore, to adjust the cutting angle of the drum 1, an angle adjustment mechanism is specifically added between the main body 6 of the coal mining machine and the rocker arm. This angle adjustment mechanism can be fixed at the center of the main body 6 of the coal mining machine, or its fixed position on the main body 6 can be determined according to specific working conditions. The rocker arm is fixed to the movable end of the angle adjustment mechanism, which drives the rocker arm to swing back and forth around the first horizontal direction 7, thus driving the drum 1 to swing back and forth around the first horizontal direction 7. The first horizontal direction 7 is perpendicular to the horizontal axis 9 of the drum 1. Figure 3 As shown, the inclination angle of the cutting end face of the drum 1 can be adjusted, thereby enabling the rocker arm coal mining machine to perform inclined cutting at high mining heights. This helps to avoid the problem of spalling during high mining heights in coal mines. Therefore, it can be seen that in addition to normal up-and-down swinging to adapt to changes in mining height, the drum 1 of this rocker arm coal mining machine can also achieve inclined cutting. Of course, it can cut the coal wall at any inclination angle for different working conditions. After the coal wall is inclinedly cut by the drum 1, the resulting inclined surface faces upwards, meaning the normal to the inclined surface is slanted upwards.
[0053] In other words, the tilt-adjustable rocker arm coal mining machine provided in this solution adds a tilt-adjustment mechanism to the rocker arm. The movable end of the tilt-adjustment mechanism drives the rocker arm to swing around the first horizontal direction 7, which in turn drives the drum 1 to swing around the first horizontal direction 7 perpendicular to its horizontal axis 9. This allows the tilt angle of the drum 1 cutting the coal surface to be adjusted, enabling the rocker arm coal mining machine to perform tilted cutting. This allows the coal wall to form a certain tilt angle during cutting, which can prevent the flaking of the coal wall caused by a straight face. This helps to avoid the problem of coal wall flaking during high mining heights, especially in open-pit coal mines with ultra-high mining heights. Of course, the tilt angle can be automatically corrected according to the requirements of mining height or geological conditions.
[0054] In this design, the movable end of the tilt adjustment mechanism is an output shaft, which can swing around the first horizontal direction 7. The main body of the tilt adjustment mechanism is fixed to the main body 6 of the coal mining machine, and its movable end is an output shaft that can swing back and forth around the first horizontal direction 7. This facilitates the swinging arm to swing back and forth around the first horizontal direction 7, making the tilt angle of the drum 1 cutting the coal surface adjustable. The output shaft of the tilt adjustment mechanism is distributed along the first horizontal direction 7. In other words, this design of the movable end of the tilt adjustment mechanism simplifies the adjustment of the drum 1's tilt angle.
[0055] Specifically, such as Figure 1 or Figure 2 As shown, the tilt adjustment mechanism includes a first swing cylinder 5. The tilt adjustment mechanism uses a swing cylinder (swing cylinder) to make the tilt adjustment of the roller 1 simple, stable, and reliable; of course, the first swing cylinder 5 is also equivalent to a tilt swing cylinder.
[0056] Furthermore, such as Figure 1 or Figure 2 As shown, the rocker arm includes: rocker arm 2 and up-down adjustment mechanism;
[0057] The up-down adjustment mechanism is located at the movable end of the tilt adjustment mechanism;
[0058] The rocker arm 2 is located at the movable end of the up-down adjustment mechanism. The movable end of the up-down adjustment mechanism is used to drive the rocker arm 2 to swing around the second horizontal direction 8, thereby driving the roller 1 to swing up and down back and forth; wherein, for example Figure 2 As shown, the second horizontal direction 8 is parallel to the horizontal axis 9 of the roller 1;
[0059] Roller 1 is located at the free end of rocker arm 2.
[0060] It should be noted that rocker arm 2 is the rocker arm body mentioned above; the up-down adjustment mechanism can be fixed to the shaft end of the output shaft of the tilt adjustment mechanism, and the end of rocker arm 2 away from its free end is fixed to the movable end of the up-down adjustment mechanism. The movable end of the up-down adjustment mechanism can drive rocker arm 2 to swing back and forth around the second horizontal direction 8, which is used to drive rocker arm 2 to swing back and forth around the second horizontal direction 8 parallel to its horizontal axis, so that drum 1 can swing up and down to meet different mining height requirements, and thus enable drum 1 to swing up and down normally to adapt to changes in mining height; of course, a rotary frame or rotary seat can be provided between the movable end of the tilt adjustment mechanism and the up-down adjustment mechanism to make the connection between the movable end of the tilt adjustment mechanism and the up-down adjustment mechanism more stable, as detailed below.
[0061] Furthermore, the movable end of the up-down adjustment mechanism is an output shaft, capable of swinging around the second horizontal direction 8. The main body of the up-down adjustment mechanism can be fixed to the end of the output shaft of the tilt adjustment mechanism, and its movable end is also an output shaft, capable of swinging back and forth around the second horizontal direction 8. This facilitates the swinging arm 2 back and forth around the second horizontal direction 8, enabling the roller 1 to swing up and down. Of course, the output shaft of the up-down adjustment mechanism is distributed along the second horizontal direction 8. In other words, this design of the movable end of the up-down adjustment mechanism simplifies the adjustment of the roller 1's up-down swing.
[0062] In this plan, such as Figure 1 As shown, the up-and-down adjustment mechanism includes a second swing cylinder 3. The up-and-down adjustment mechanism adopts the form of a swing cylinder (swing cylinder), which makes the up-and-down swing adjustment of the roller 1 simple, stable and reliable; of course, the second swing cylinder 3 is also equivalent to an up-and-down swing cylinder.
[0063] Specifically, such as Figure 1 or Figure 2 As shown, the rocker arm also includes a rotary seat 4;
[0064] Rotary seat 4 is located at the movable end of the tilt adjustment mechanism;
[0065] The rocker arm 2 is mounted on the rotary seat 4 and can swing around the second horizontal direction 8.
[0066] The second swing cylinder 3 is located on the rotary seat 4 and is used to drive the rocker arm 2 to swing around the second horizontal direction 8.
[0067] It should be noted that the rotary seat 4 can be fixed to the shaft end of the output shaft of the first swing cylinder 5. The rotary seat 4 can be equivalent to the swing seat of the rocker arm 2. The end of the rocker arm 2 away from its free end can swing back and forth around the second horizontal direction 8 and is set on the rotary seat 4. The second swing cylinder 3 is fixed to the rotary seat 4 and is used to drive the rocker arm 2 to swing back and forth around the second horizontal direction 8. Of course, the rotary seat 4 is also equivalent to the mounting seat of the second swing cylinder 3. That is to say, the rocker arm is provided with a rotary seat 4, which not only facilitates the installation of the rocker arm 2, but also facilitates the setting of the second swing cylinder 3, thereby facilitating the second swing cylinder 3 to drive the rocker arm 2 to swing back and forth around the second horizontal direction 8. At the same time, it also makes the connection between the rocker arm and the movable end of the tilt adjustment mechanism more stable.
[0068] Furthermore, such as Figure 2 As shown, the rocker arm 2 is provided with an ear piece 2.1;
[0069] A rotary groove 4.1 is provided on the first side end 4.2 of the rotary seat 4, and the lug 2.1 of the rocker arm 2 can swing back and forth around the second horizontal direction 8 and is disposed in the rotary groove 4.1 of the rotary seat 4;
[0070] The second swing cylinder 3 is located on the second side end 4.3 of the rotary seat 4, and its output shaft passes through the rotary groove 4.1 and is connected to the lug 2.1 of the rocker arm 2 in a transmission manner;
[0071] The third side end 4.4 of the rotary seat 4 is located at the movable end of the tilt adjustment mechanism; wherein, the first side end 4.2 of the rotary seat 4 is adjacent to the second side end 4.3, and the first side end 4.2 is opposite to the third side end 4.4.
[0072] It should be noted that, as Figure 2 As shown, the rocker arm 2 has an ear piece 2.1 at the end away from its free end;
[0073] The rotary groove 4.1 on the first side end 4.2 (such as the left side end) of the rotary seat 4 can penetrate the top and bottom ends of the rotary seat 4, ensuring that the lug 2.1 of the rocker arm 2 has sufficient swing space in the rotary groove 4.1 to avoid swing interference; of course, the width of the lug 2.1 can be adapted to the groove width of the rotary groove 4.1 to prevent the lug 2.1 of the rocker arm 2 from shaking when swinging in the rotary groove 4.1; the second swing cylinder 3 can be fixed to the second side end 4.3 (such as the front end or rear end) of the rotary seat 4, and its output shaft passes through the rotary groove 4.1 and can pass through the lug 2.1 of the rocker arm 2, and is also connected to the lug 2.1 of the rocker arm 2 in a transmission connection; wherein, the lug 2 of the rocker arm 2 1. A through mounting hole is provided, and the output shaft of the second swing cylinder 3 actually passes through the mounting hole of the lug 2.1 of the rocker arm 2 and is connected to the mounting hole of the lug 2.1 for transmission, so as to drive the lug 2.1 of the rocker arm 2 to swing back and forth around the second horizontal direction 8; the third side end 4.4 (such as the right side end) of the rotary seat 4 is fixed to the shaft end of the output shaft of the tilt adjustment mechanism; that is to say, the above scheme is designed so that the back and forth swing of the rocker arm 2 around the second horizontal direction 8 is more stable and reliable, and also makes the connection between the output shaft of the tilt adjustment mechanism and the rotary seat 4 more stable; in addition, in order to improve the stability and reliability of the back and forth swing of the rocker arm 2 around the second horizontal direction 8, such as Figure 2 As shown, the number of lugs 2.1 of the rocker arm 2 can be two, and the number of rotary grooves 4.1 can also be two. That is, the two lugs 2.1 of the rocker arm 2 are set in the two rotary grooves 4.1 of the rotary seat 4 in the manner described above. The output shaft of the second swing cylinder 3 passes through the two rotary grooves 4.1 in sequence and is connected to the two lugs 2.1 of the rocker arm 2 respectively.
[0074] In addition, the rocker arm coal mining machine described in this solution uses a permanent magnet motor to directly drive the drum 1 as its power source.
[0075] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.
[0076] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those 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 to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A pitch adjustable boom shearer comprising: The coal mining machine body (6), rocker arm and drum (1), wherein the rocker arm is disposed on the coal mining machine body (6) and the drum (1) is disposed on the free end of the rocker arm, characterized in that it further includes an inclination adjustment mechanism; The tilt adjustment mechanism is located on the main body (6) of the coal mining machine, and the rocker arm is located on the movable end of the tilt adjustment mechanism. The movable end of the tilt adjustment mechanism is used to drive the rocker arm to swing around the first horizontal direction (7); wherein, the first horizontal direction (7) is perpendicular to the horizontal axis (9) of the drum (1). The movable end of the tilt adjustment mechanism is an output shaft, and it can swing around the first horizontal direction (7); The tilt adjustment mechanism includes a first swing cylinder (5); The rocker arm includes: a rocker arm (2) and a height adjustment mechanism; The up-down adjustment mechanism is located at the movable end of the tilt adjustment mechanism; The rocker arm (2) is located at the movable end of the up-down adjustment mechanism, and the movable end of the up-down adjustment mechanism is used to drive the rocker arm (2) to swing around the second horizontal direction (8); wherein, the second horizontal direction (8) is parallel to the horizontal axis (9) of the roller (1); The roller (1) is disposed at the free end of the rocker arm (2); The movable end of the up-down adjustment mechanism is an output shaft, and it can swing around the second horizontal direction (8); The up-down adjustment mechanism includes a second swing cylinder (3); The rocker arm also includes a rotary seat (4). The rotary seat (4) is located at the movable end of the tilt adjustment mechanism; The rocker arm (2) is swayable around the second horizontal direction (8) and is mounted on the rotary seat (4); The second swing cylinder (3) is disposed on the rotary seat (4) and is used to drive the rocker arm (2) to swing around the second horizontal direction (8); The rocker arm (2) is provided with an ear piece (2.1); The first side end (4.2) of the rotary seat (4) is provided with a rotary groove (4.1), and the lug (2.1) of the rocker arm (2) can swing around the second horizontal direction (8) and is disposed in the rotary groove (4.1) of the rotary seat (4); The second swing cylinder (3) is located at the second side end (4.3) of the rotary seat (4), and its output shaft passes through the rotary groove (4.1) and is connected to the lug (2.1) of the rocker arm (2) in a transmission manner; The third side end (4.4) of the rotary seat (4) is located at the movable end of the tilt adjustment mechanism; wherein the first side end (4.2) of the rotary seat (4) is adjacent to the second side end (4.3), and the first side end (4.2) is opposite to the third side end (4.4).