A coal shearer coal blocking assembly and a coal shearer

Abstract

The utility model provides a kind of coal shearer coal blocking assembly and coal shearer, it is related to coal mining machinery equipment technical field, coal blocking assembly is installed on swing arm, drum is installed on swing arm, coal blocking assembly includes coal blocking plate;Coal blocking plate is located the circumferential outside of drum;The inner wall of coal blocking plate is concave inward, and the inner wall of coal blocking plate is towards drum;The distance between the inner wall of coal blocking plate and the circumferential excircle of drum is relevant to the radius of the inner wall of coal blocking plate, the radius of the circumferential excircle of drum, the distance between the center of the inner wall of coal blocking plate and the center of drum and the half center angle of the inner wall of coal blocking plate.The coal blocking assembly can realize the effective flow of more coal, improve coal loading efficiency, without additional field cleaning process, improve operation efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of coal mining machinery and equipment, specifically to a coal-blocking component for a coal mining machine and a coal mining machine. Background Technology

[0002] In longwall fully mechanized coal mining, the coal mining machine is the core equipment. Its working principle is to break the coal by rotating a drum equipped with cutting teeth, and then throw the broken coal onto a scraper conveyor for transportation. In this process, the coal retaining plate is a key but often overlooked auxiliary component. It is usually hinged to the rocker arm of the coal mining machine and located on the rear side of the drum (relative to the coal loading direction).

[0003] Although coal retaining plates are indispensable, existing traditional coal retaining plates, whether fixed or simple flip-up, all have the following technical problems that urgently need to be solved: 1. Low coal loading efficiency and messy site: When the existing coal retaining plate is in use, some coal is not effectively guided to the scraper conveyor. Instead, it bounces back after hitting the coal retaining plate and splashes onto the coal wall side or goaf, resulting in low coal loading efficiency and a messy site that requires further processing and increases the number of operation procedures.

[0004] 2. Existing coal retaining plates cannot adaptively change direction, requiring manual operation, which poses significant safety hazards and is inefficient: When the coal mining machine completes a working stroke, for example, when the coal mining machine changes from right-hand traction to left-hand traction, the coal loading direction also changes accordingly. At this time, the coal retaining plate must be flipped from its current position to the other side of the drum to continue working normally. That is, the coal retaining plate needs to be located at the rear of the drum along the traction direction. Currently, most coal mines still use manual flipping. Operators need to approach the drum area under the cover of hydraulic supports and use tools or manpower to flip the plate. This process is extremely dangerous, time-consuming, labor-intensive, and has a high labor intensity. Utility Model Content

[0005] This utility model addresses the problems existing in the prior art by providing a coal-blocking component for a coal mining machine that can effectively guide more coal, improve coal loading efficiency, eliminate the need for additional on-site cleaning procedures, and improve operational efficiency. It also provides a coal-blocking component for a coal mining machine that eliminates the need for close-range operation by operators, saves operating time, reduces safety hazards, and can achieve adaptive reversal without manual operation, thereby reducing labor intensity and improving operational efficiency.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: In a first aspect, this utility model provides a coal-blocking assembly for a coal mining machine. The coal-blocking assembly is mounted on a rocker arm, and a roller is mounted on the rocker arm. The coal-blocking assembly includes a coal-blocking plate. The coal-blocking plate is located circumferentially outside the roller. The inner wall of the coal-blocking plate is concave inward and faces the roller. The range of the distance between the inner wall of the coal retaining plate and the outer circumferential surface of the drum is: ~ ; in, Let be the radius of the inner wall of the coal retaining plate. Let be the radius of the outer circumference of the roller. This is the distance between the center of the inner wall of the coal retaining plate and the center of the drum. It is the semi-circular central angle of the inner wall of the coal retaining plate.

[0007] In some embodiments, the center of the inner wall of the coal retaining plate is located at a first position, which is located in front of the center of the drum along the traction direction.

[0008] In some embodiments, the coal blocking assembly further includes a connector and a drive component. The connector includes a first end and a second end. The first end is fixedly connected to the coal blocking plate, and the second end is movably connected to the rocker arm. The drive component is disposed between the second end and the rocker arm. When the drive unit is activated, the drive unit controls the connector, causing the connector to move the coal retaining plate from the second position to the third position or from the third position to the second position; the second position is located at the rear side of the drum along the first traction direction, and the third position is located at the rear side of the drum along the second traction direction.

[0009] In some embodiments, the connector drives the coal retaining plate to rotate along a first axis, causing the coal retaining plate to move from the second position to the third position or from the third position to the second position, wherein the first axis is the rotating shaft of the drum.

[0010] In some embodiments, the second end is rotatably engaged with the rocker arm along a first axis, which is the rotating shaft of the roller.

[0011] In some embodiments, the drive component includes an external gear, an internal gear, and a power motor. The internal gear is fixed at the second end, and the axis of the internal gear is arranged along the first axis. The external gear is located inside the internal gear and meshes with the internal gear. The external gear is fixed on the output shaft of the power motor, and the shaft of the external gear is coaxial with the output shaft of the power motor. The power motor is fixedly connected to the rocker arm.

[0012] In some embodiments, the rocker arm is controlled by a hydraulic system that powers the drive motor.

[0013] In some embodiments, a return fluid circuit is provided between the hydraulic system and the power motor, and a balance valve is installed on the return fluid circuit.

[0014] In some embodiments, the coal retaining plate moves from the second position to the third position along a first direction, and the coal retaining plate moves from the second position to the third position along a second direction, wherein the first direction is opposite to the second direction.

[0015] Secondly, this utility model embodiment proposes a coal-blocking assembly for a coal mining machine. The coal-blocking assembly is installed on a rocker arm, and a roller is installed on the rocker arm. The coal-blocking assembly includes a coal-blocking plate connector and a driving component. The coal-blocking plate is located circumferentially outside the roller. The inner wall of the coal-blocking plate is concave inward and faces the roller. The connector includes a first end and a second end. The first end is fixedly connected to the coal-blocking plate, and the second end is movably connected to the rocker arm. The driving component is disposed between the second end and the rocker arm. When the drive unit is activated, the drive unit controls the connector, causing the connector to move the coal retaining plate from the second position to the third position or from the third position to the second position; the second position is located at the rear side of the drum along the first traction direction, and the third position is located at the rear side of the drum along the second traction direction.

[0016] Thirdly, this utility model embodiment proposes a coal mining machine, including a rocker arm, a drum, and the coal blocking assembly.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. This utility model optimizes the distance between the inner wall of the coal retaining plate and the outer circumferential surface of the drum, making the arc curvature of the inner wall of the coal retaining plate more compatible with the optimal projection trajectory of the drum blades. Compared with the prior art, when the drum is performing coal and rock cutting operations, the coal retaining plate can effectively guide more coal, so that most of the coal is guided to the scraper conveyor by the coal retaining plate, improving coal loading efficiency while eliminating the need for additional on-site cleaning procedures, thus improving operational efficiency.

[0018] 2. This utility model uses a driving component to act on a connecting component, causing the connecting component to move the coal retaining plate from the second position to the third position or from the third position to the second position. This ensures that the coal retaining plate is always located behind the drum during operation, eliminating the need for operators to work at close range, saving operating time, reducing safety hazards, and achieving adaptive reversal without manual operation, thus reducing labor intensity and improving operating efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the coal-blocking component of the coal mining machine of this utility model installed on the rocker arm; Figure 2 This is a schematic diagram showing the connection relationship between the coal-blocking component, the rocker arm, and the drum in this utility model; Figure 3 This is a schematic diagram of the structure of the coal-blocking component of this utility model; Figure 4 for Figure 3 A magnified schematic diagram of the structure at point B in the middle; Figure 5 This is a schematic diagram showing the connection relationship between the coal-blocking component and the wear-resistant ring in this utility model; Figure 6 This is a perspective view showing the connection relationship between the coal-blocking component and the wear-resistant ring in this utility model. Figure 7 This is a schematic diagram of the structure of the coal blocking component of this utility model installed on the wear-resistant ring.

[0020] The reference numerals in the attached drawings are as follows: 10, coal retaining assembly; 11, coal retaining plate; 12, connector; 121, first end; 122, second end; 13, ring; 14, internal gear; 15, power motor; 16, external gear; 20, rocker arm; 21, wear-resistant ring; 211, through hole; 212, groove; 30, drum; 31, drum blade; 40, hydraulic system. Detailed Implementation

[0021] To clearly illustrate the technical features of this solution, the implementation methods of this application will be described in detail below with reference to the accompanying drawings and embodiments. This will allow for a full understanding and implementation of how this application uses technical means to solve technical problems and achieve corresponding technical effects. The embodiments of this application and the various features within them can be combined with each other without conflict, and the resulting technical solutions are all within the protection scope of this application.

[0022] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0023] In response to the problems in the existing technology, the inventors discovered through numerous experiments and observations that the reason why some coal is not effectively guided to the scraper conveyor when using the existing coal retaining plate, but instead bounces back after hitting the coal retaining plate and splashes to the side of the coal wall or the goaf, is because the arc curvature of the existing coal retaining plate has not been optimized, or is only a simple arc, which cannot match the optimal projection trajectory of the drum blades.

[0024] Firstly, to address the problem in the existing technology that some coal is not effectively guided to the scraper conveyor, but instead bounces back after impacting the coal retaining plate 11, splashing onto the coal wall side or goaf, this utility model proposes a coal retaining component for a coal mining machine. The coal retaining component 10 is installed on the rocker arm 20, and a roller 30 is installed on the rocker arm 20. The coal retaining component 10 includes a coal retaining plate 11; the coal retaining plate 11 is located on the outer circumference of the roller 30; the inner wall of the coal retaining plate 11 is concave inward and faces the roller 30. The range of the distance between the inner wall of the coal retaining plate 11 and the outer circumferential tangent of the drum 30 is: ~ ; in, Let be the radius of the inner wall of the coal retaining plate. Let be the radius of the circumferential tangent surface of the roller. The circumferential tangent surface of the roller is the tangential surface of the roller blades along the circumferential direction of the roller. This is the distance between the center of the inner wall of the coal retaining plate and the center of the drum. It is the semi-circular central angle of the inner wall of the coal retaining plate.

[0025] Beneficially, by optimizing the distance between the inner wall of the coal retaining plate 11 and the outer circumferential surface of the drum 30, the curvature of the inner wall of the coal retaining plate 11 is better matched to the optimal projection trajectory of the drum blades 31. Compared with the existing technology where the axis of the coal retaining plate is completely aligned with the axis of rotation of the drum, the coal retaining plate 11 can effectively guide more coal during the coal and rock cutting operation of the drum 30. The gap between the coal retaining plate 11 and the drum 30 is not the traditional fixed gap. R 1- R 2. Instead, the distance from the horizontal position of the drum 30 is small, while the distance from the far end of the drum 30 is large, and the gap gradually increases, forming a gradually expanding "trumpet mouth" shaped flow channel. This greatly reduces the collision and rebound of coal blocks with the coal retainer plate 11, allowing the coal flow to enter the scraper conveyor more concentratedly and smoothly. This ensures that most of the coal is guided to the scraper conveyor by the coal retainer plate 11, improving coal loading efficiency without the need for additional on-site cleaning procedures, thus improving operational efficiency.

[0026] In some embodiments, the center of the inner wall of the coal retaining plate 11 is located at a first position, which is located in front of the center of the drum 30 along the traction direction. This position makes the coal retaining plate 11 closer to the drum 30 on the rear side of the drum 30, which is more conducive to achieving effective flow guidance.

[0027] Besides the problem of some coal not being effectively diverted, the existing coal retaining plates cannot adaptively change direction, requiring manual operation, which poses significant safety hazards and is inefficient. When the coal mining machine completes a working stroke, for example, if the coal mining machine changes from right-hand traction to left-hand traction, the coal loading direction also changes accordingly. At this time, the coal retaining plate must be flipped from its current position to the other side of the drum to continue working normally. That is, the coal retaining plate needs to be located behind the drum along the traction direction. Currently, most coal mines still use manual flipping. Operators need to approach the drum area under the cover of hydraulic supports and use tools or manpower to flip the plate. This process is extremely dangerous, time-consuming, labor-intensive, and has a high labor intensity.

[0028] To solve the problem that the coal retaining plate cannot automatically rotate, in some embodiments, the coal retaining assembly 10 further includes a connector 12 and a drive component. The connector 12 includes a first end and a second end. The first end is fixedly connected to the coal retaining plate 11, and the second end is movably connected to the rocker arm 20. The drive component is disposed between the second end and the rocker arm 20. When the drive unit is activated, it controls the connecting member 12, causing the connecting member 12 to move the coal retaining plate 11 from the second position to the third position or from the third position to the second position. The second position is located behind the drum 30 along the first traction direction, and the third position is located behind the drum 30 along the second traction direction. Typically, the traction direction includes the first traction direction being opposite to the second traction direction, and the first traction direction being opposite to the second traction direction. For ease of description, using Figure 1 The direction from the center to the right is designated as the first traction direction. Figure 1 The direction from the center to the left is the second traction direction; when the traction direction is the first traction direction, the coal retaining plate 11 is located in the second position, that is, the coal retaining plate 11 is located on the left side of the drum 30; when the traction direction is the second traction direction, the coal retaining plate 11 is located in the third position, that is, the coal retaining plate 11 is located on the right side of the drum 30. Typically, a coal mining machine is equipped with two drums 30, namely a front drum and a rear drum. The drum 30 located at the front of the coal mining machine along the traction direction is the front drum, and the drum 30 located at the rear of the coal mining machine along the traction direction is the rear drum. Figure 1 For example, at this time, the traction direction is the first traction direction, which is the right traction direction. The coal mining machine moves to the right, and the coal blocking plate 11 is located behind the drum 30, that is, to the left of the drum 30, which is the second position. The front drum rotates clockwise to cut the coal and rock, and the rear drum rotates counterclockwise to cut the coal. The coal thrown backward by the rotating drum 30 is blocked by the coal blocking plate 11 located in the second position and guided to the scraper conveyor located below. When the traction direction changes to the second traction direction, which is the left traction direction, the coal mining machine moves to the left. At this time, the right side of the drum 30 is the rear side. Before the coal mining operation continues, the coal retaining plate 11 needs to move from the second position to the third position under the action of the driving component. When the coal retaining plate 11 is in the third position, the coal retaining plate 11 is located behind the drum 30. The front drum rotates counterclockwise to cut the coal and rock, and the rear drum rotates clockwise to cut the coal and rock. The coal thrown backward by the rotating drum 30 is blocked by the coal retaining plate 11 in the third position and guided to the scraper conveyor below. The advantage is that by driving the connecting member 12, the connecting member 12 drives the coal retaining plate 11 to move from the second position to the third position or from the third position to the second position, so that the coal retaining plate 11 is always located behind the drum 30 during operation. This eliminates the need for operators to work at close range, saves operating time, reduces safety hazards, and achieves adaptive reversal without manual operation, reducing labor intensity and improving operating efficiency.

[0029] Meanwhile, the working face of the coal retaining plate 11, i.e., the inner wall of the coal retaining plate 11, is subjected to the scouring and impact of the coal flow for a long time, resulting in severe wear. Traditional coal retaining plates 11 are mostly made of ordinary steel plates or only have surface treatment, which is insufficient in terms of wear resistance. In order to improve the wear resistance of the coal retaining plate 11, the inner wall of the coal retaining plate 11 is made of high-strength wear-resistant plate (such as NM450). The excellent wear resistance of this special wear-resistant plate can not only significantly extend the service life of the coal retaining plate 11, but also the high strength and good toughness of this special wear-resistant plate can withstand the impact and wear under harsh working conditions. From an economic point of view, although the initial cost is high, the ultra-long service life of this special wear-resistant plate can reduce downtime, resulting in a lower overall cost.

[0030] In some embodiments, the connector 12 drives the coal retaining plate 11 to rotate along the first axis, so that the coal retaining plate 11 moves from the second position to the third position or from the third position to the second position. The first axis is the rotating shaft of the drum 30. When the coal retaining plate 11 rotates along the first axis, the distance between the coal retaining plate 11 and the outer circumferential surface of the drum 30 can be kept constant, thereby avoiding interference between the coal retaining plate 11 and the drum 30 during the movement and reducing the difficulty of the coal retaining plate 11 flipping between the second position and the third position.

[0031] In some embodiments, the second end rotates with the rocker arm 20 along a first axis, which is the rotating shaft of the drum 30. When the drive unit controls the connecting member 12, causing the connecting member 12 to move the coal retaining plate 11 from the second position to the third position or from the third position to the second position, the second end rotates relative to the rocker arm 20 along the first axis. (See also...) Figure 5The second end is fixedly connected to a ring 13, which rotates with the rocker arm 20 along the first axis. That is, the axis of the ring 13 is collinear with the axis of the first axis. The structure is simple and easy to operate. Furthermore, a wear-resistant ring 21 is fixedly connected to the rocker arm 20, and the ring 13 rotates with the wear-resistant ring 21. Since the rocker arm 20 is a key component of the coal mining machine, the wear-resistant ring 21 can prevent the ring 13 from directly contacting the rocker arm 20 and ensure the service life of the rocker arm 20.

[0032] In some embodiments, the coal retaining plate 11 moves from the second position to the third position along the first direction and from the second position to the third position along the second direction. The first direction is opposite to the second direction. During operation, the movement of the coal retaining plate 11 is driven by the connecting member 12. Therefore, to realize the movement of the coal retaining plate 11 between the second position and the third position, at least a rotation space needs to be reserved between the rocker arm 20 and the drum 30 for the connecting member 12. Usually, the angle between the first connecting line and the second connecting line is 180°. The first connecting line is the line connecting the center of the second position and the center of the drum 30, and the second connecting line is the line connecting the center of the third position and the center of the drum 30. If the coal retaining plate 11 moves from the second position to the third position along the first direction and from the second position to the third position along the second direction opposite to the first direction, then only a semi-circular rotation space needs to be reserved between the rocker arm 20 and the drum 30, thereby saving design space.

[0033] In some embodiments, the drive unit includes an external gear 16, an internal gear 14, and a power motor 15, with the internal gear 14 fixed at the second end, see [reference needed]. Figure 3 , 5 6. The internal gear 14 is fixedly connected to the ring 13. The internal gear 14 is arranged on the inner wall of the ring 13, and its axis is arranged along the first axis. The external gear 16 is located inside the internal gear 14 and meshes with the internal gear 14. (See [reference]) Figure 4 The internal gear 14 is located outside the wear-resistant ring 21, and the external gear 16 is located inside the wear-resistant ring 21. A through hole 211 is formed on the wear-resistant ring 21, and the internal gear 14 and the external gear 16 mesh at the through hole 211. Further, see... Figure 7 The wear-resistant ring 21 has a groove 212 at the through hole on its inner side. The external gear 16 is located at the groove 212. The external gear 16 is fixed on the output shaft of the power motor 15, and the shaft of the external gear 16 is coaxial with the output shaft of the power motor 15. The power motor 15 is fixedly connected to the rocker arm 20, which facilitates stable driving of the external gear 16. When the power motor 15 starts, the external gear 16 is driven to rotate by the power motor 15, which drives the internal gear 14 meshing with the external gear 16 to rotate, that is, the second end rotates along the first shaft, which drives the coal retaining plate 11 to move from the second position to the third position or from the third position to the second position. The structure is simple, the operation is stable, and it is easy to install on the existing coal mining machine, reducing the modification cost.

[0034] See Figure 2 In some embodiments, the rocker arm 20 is controlled by a hydraulic system 40, which provides power to the motor 15, eliminating the need for an additional power supply structure, simplifying the structure, and reducing design difficulty and space requirements.

[0035] In some embodiments, a return fluid circuit is provided between the hydraulic system 40 and the power motor 15. A balance valve is installed on the return fluid circuit. The balance valve has an overflow function, which can prevent the coal retaining plate 11 from falling due to its own weight at any angle. It can also prevent the coal retaining plate 11 from being suddenly impacted by the pressure value of the balance valve by calculating the pressure value of the balance valve. For example, if the operator accidentally hits the gangue or forgets to adjust the direction of the coal retaining plate 11 and hits the coal wall, the overflow of the balance valve can protect the external gear 16 and internal gear 14 and other components, thereby improving the service life of the drive components.

[0036] Secondly, to solve the problem that the coal retaining plate 11 cannot achieve automatic rotation, this utility model embodiment proposes a coal retaining component for a coal mining machine. The coal retaining component 10 is installed on the rocker arm 20, and the rocker arm 20 is equipped with a roller 30. The coal retaining component 10 includes a coal retaining plate 11 connector 12 and a driving component. The coal retaining plate 11 is located on the outer circumference of the roller 30. The inner wall of the coal retaining plate 11 is concave inward and faces the roller 30. The connector 12 includes a first end and a second end. The first end is fixedly connected to the coal retaining plate 11, and the second end is movably connected to the rocker arm 20. The driving component is disposed between the second end and the rocker arm 20. When the drive unit is started, the drive unit controls the connecting member 12, causing the connecting member 12 to move the coal retaining plate 11 from the second position to the third position or from the third position to the second position; the second position is located at the rear side of the drum 30 along the first traction direction, and the third position is located at the rear side of the drum 30 along the second traction direction.

[0037] Thirdly, this utility model embodiment proposes a coal mining machine, including a rocker arm 20, a drum, and a coal blocking assembly 10.

[0038] Finally, it should be noted that the above content is only used to illustrate the technical solution of this utility model, and is not intended to limit the scope of protection of this utility model. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model do not depart from the essence and scope of the technical solution of this utility model.

Claims

1. A coal-blocking assembly for a coal mining machine, characterized in that, The coal blocking assembly is mounted on a rocker arm, and a roller is mounted on the rocker arm. The coal blocking assembly includes a coal blocking plate; the coal blocking plate is located circumferentially outside the roller; the inner wall of the coal blocking plate is concave inward and faces the roller. The range of the distance between the inner wall of the coal retaining plate and the outer circumferential surface of the drum is: ~ ； in, Let be the radius of the inner wall of the coal retaining plate. Let be the radius of the outer circumference of the roller. This is the distance between the center of the inner wall of the coal retaining plate and the center of the drum. It is the semi-circular central angle of the inner wall of the coal retaining plate.

2. The coal-blocking assembly of the coal mining machine according to claim 1, characterized in that, The center of the inner wall of the coal retaining plate is located at the first position, which is located in front of the center of the drum along the traction direction.

3. The coal-blocking assembly of the coal mining machine according to claim 1 or 2, characterized in that, The coal blocking assembly further includes a connector and a driving component. The connector includes a first end and a second end. The first end is fixedly connected to the coal blocking plate, and the second end is movably connected to the rocker arm. The driving component is disposed between the second end and the rocker arm. When the drive unit is activated, the drive unit controls the connector, causing the connector to move the coal retaining plate from the second position to the third position or from the third position to the second position; the second position is located at the rear side of the drum along the first traction direction, and the third position is located at the rear side of the drum along the second traction direction.

4. The coal-blocking assembly of the coal mining machine according to claim 3, characterized in that, The connecting member drives the coal retaining plate to rotate along the first axis, so that the coal retaining plate moves from the second position to the third position or from the third position to the second position, and the first axis is the rotating shaft of the drum.

5. The coal-blocking assembly of the coal mining machine according to claim 4, characterized in that, The second end is rotatably engaged with the rocker arm along the first axis.

6. The coal-blocking assembly of the coal mining machine according to claim 5, characterized in that, The driving component includes an external gear, an internal gear, and a power motor. The internal gear is fixed at the second end, and the axis of the internal gear is arranged along the first axis. The external gear is located inside the internal gear and meshes with the internal gear. The external gear is fixed on the output shaft of the power motor, and the rotating shaft of the external gear is coaxial with the output shaft of the power motor. The power motor is fixedly connected to the rocker arm.

7. The coal-blocking assembly of the coal mining machine according to claim 6, characterized in that, The rocker arm is controlled by a hydraulic system, which provides power to the drive motor.

8. The coal-blocking assembly of the coal mining machine according to claim 7, characterized in that, A return fluid circuit is provided between the hydraulic system and the power motor, and a balance valve is installed on the return fluid circuit.

9. A coal-blocking assembly for a coal mining machine, characterized in that, The coal-blocking assembly is mounted on a rocker arm, and a roller is mounted on the rocker arm. The coal-blocking assembly includes a coal-blocking plate connector and a driving component. The coal-blocking plate is located circumferentially outside the roller. The inner wall of the coal-blocking plate is concave and faces the roller. The connector includes a first end and a second end. The first end is fixedly connected to the coal-blocking plate, and the second end is movably connected to the rocker arm. The driving component is disposed between the second end and the rocker arm. The driving component controls the connecting component, causing the connecting component to move the coal retaining plate from the second position to the third position or from the third position to the second position; the second position is located at the rear side of the drum along the first traction direction, and the third position is located at the rear side of the drum along the second traction direction.

10. A coal mining machine, characterized in that, It includes a rocker arm, a roller, and a coal-blocking assembly for a coal mining machine as described in any one of claims 1-9.

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