Coal cutter coal blocking structure
By improving the design of the coal-blocking structure of the coal mining machine and utilizing a spring and worm gear transmission system, the problems of easy damage, difficult angle adjustment, and insufficient buffering of the coal-blocking structure were solved, thus achieving efficient, safe, and flexible coal mining.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LIAONING DAOLU HEAVY IND MASCH EQUIP CO LTD
- Filing Date
- 2025-07-22
- Publication Date
- 2026-06-16
AI Technical Summary
Traditional coal mining machines are prone to deformation and damage when faced with the impact of coal and gangue. The angle of the coal barrier is difficult to adjust flexibly, and the buffering capacity is insufficient, resulting in coal splashing and scattering, which increases mining costs and safety threats.
The coal-blocking structure is designed with a base plate, support frame, angle adjustment mechanism and transmission mechanism. It utilizes springs, X-shaped support plates and worm gear transmission system to achieve buffering, angle adjustment and stable support of the baffle, thereby enhancing its impact resistance and flexibility.
It improves the durability and adaptability of the coal retaining structure, reduces the frequency of equipment maintenance, enhances coal mining efficiency and safety, and lowers mining costs.
Smart Images
Figure CN224363944U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of coal mining equipment technology, and in particular to a coal-blocking structure for a coal mining machine. Background Technology
[0002] In coal mining, the coal mining machine is a key piece of equipment, and the performance of its coal retaining structure is crucial. Traditional coal mining machine retaining structures often have some shortcomings. For example, when faced with the impact of coal and gangue, the baffles are easily deformed and damaged, affecting the coal retaining effect. Moreover, it is difficult to flexibly adjust the coal retaining angle under different coal seam thicknesses and mining directions, leading to frequent coal splashing and scattering, which not only wastes resources but also threatens the safety of underground workers. In addition, the buffer design of conventional coal retaining structures is inadequate and cannot effectively cope with the strong impact of coal and gangue. Frequent replacement of coal retaining components also increases mining costs and equipment downtime, restricting the improvement of coal mining efficiency.
[0003] Therefore, we propose a coal-blocking structure for coal mining machines. Utility Model Content
[0004] The main purpose of this utility model is to provide a coal retaining structure for a coal mining machine. In order to prevent problems such as easy deformation and damage of the baffle plate under the impact of coal and gangue, difficulty in flexibly adjusting the coal retaining angle leading to coal splashing and scattering, and insufficient buffering capacity causing frequent replacement of parts, the traditional coal retaining structure can improve the impact resistance and durability of the coal retaining structure, the flexibility to adapt to different working conditions, and the safety and efficiency of coal mining operations, reduce mining costs and equipment downtime, and effectively solve the problems in the background art.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0006] A coal-blocking structure for a coal mining machine includes a base plate, a support frame fixedly connected to the top of the base plate, an angle adjustment mechanism on the support frame, a transmission mechanism connected to the angle adjustment mechanism on the base plate, a first baffle on the front side of the angle adjustment mechanism, a protective frame fixedly connected to the front edge of the first baffle, a second baffle on the inner side of the protective frame, four fixed columns fixedly connected to the front side of the first baffle, an X-shaped support plate connected to the front side of the four fixed columns, an array of telescopic rods on the front side of the X-shaped support plate, a ring on the rear side of the second baffle near the first baffle, the ring fixedly connected to the telescopic end of the telescopic rod, a first spring connected between the ring and the X-shaped support plate, and the first spring sleeved on the outside of the telescopic rod.
[0007] The second baffle has U-shaped plates symmetrically distributed on its rear side. The inner side of the X-shaped support plate is rotatably connected to two second movable blocks. The outer side of the second movable block is equipped with a first round rod. The inner side of the first round rod is slidably connected to a second round rod. The outer side of the second round rod is connected to the first movable block. A second spring is connected between the first movable block and the first round rod, and the second spring is sleeved on the outside of the second round rod. The first movable block is rotatably connected to the inner side of the U-shaped plate.
[0008] The second baffle has a first U-shaped seat symmetrically distributed on its rear side, and a second U-shaped seat symmetrically distributed on its front side. The inner sides of the two first U-shaped seats and the two second U-shaped seats are rotatably connected to two supporting rotating plates.
[0009] By adopting the above technical solution, when the coal or gangue mined by the cutting drum of the coal mining machine hits the second baffle, the second baffle, as a directly force-bearing component, will be subjected to a forward impact force and will be displaced to the rear.
[0010] During this process, the ring on the rear side of the second baffle moves backward synchronously, squeezing the first spring sleeved on the outside of the telescopic rod. The first spring generates elastic restoring force due to compression, which can buffer most of the impact force and prevent the second baffle from deforming or being damaged due to excessive instantaneous force. At the same time, the telescopic rod is connected to the fixed column through the X-shaped support plate, providing stable support and guidance for the second baffle and preventing its lateral displacement. The cross structure of the X-shaped support plate can disperse the impact force to the four fixed columns, further enhancing the impact resistance of the overall structure.
[0011] When the second baffle tilts backward or undergoes local displacement under force, the U-shaped plate behind it will drive the first movable block to move. The first movable block pulls the second round rod to slide along the inner side of the first round rod. At this time, the second spring sleeved on the outside of the second round rod is stretched or compressed, and the resulting elastic force can counteract the local displacement force of the second baffle, playing a role in auxiliary buffering and position correction. The rotational connection between the second movable block and the X-shaped support plate can adapt to the angle changes of the second round rod and the first round rod, ensuring that the buffer structure can flexibly respond to impact forces from different directions.
[0012] In addition, the supporting rotary plate between the first U-shaped seat on the rear side of the second baffle and the second U-shaped seat on the front side of the first baffle will rotate as the second baffle moves. The supporting rotary plate further distributes the impact force through its own rotational deformation, while limiting the excessive displacement of the second baffle. Together with the limiting effect of the protective frame on the edge of the second baffle, it ensures that it always works stably within the preset range, effectively blocking coal from splashing to both sides and guiding the coal to slide down the curved surface of the second baffle into the scraper conveyor.
[0013] Furthermore, the angle adjustment mechanism includes a threaded rod rotatably connected to the front and rear inner walls of the support frame, a movable block threadedly connected to the outer side of the threaded rod, a movable rod fixedly connected to both ends of the movable block, and a first connecting rod fixedly connected to the opposite ends of the two movable rods.
[0014] By adopting the above technical solution, when it is necessary to adjust the coal blocking angle of the first baffle to adapt to different coal seam thicknesses or coal mining directions, the rotation of the threaded rod will drive the moving block connected by the outer thread to move along the axial direction of the threaded rod. The moving block drives the moving rods at both ends to move synchronously, and then transmits power to the connecting plate connected later through the first connecting rod, and finally drives the first baffle to adjust the tilt angle around the rotation fulcrum, so as to achieve precise control of the coal blocking direction.
[0015] Furthermore, the inner walls at both ends of the support frame are provided with through grooves, and the opposite ends of the two first connecting rods extend through the through grooves to the outer wall and are rotatably connected to connecting plates.
[0016] By adopting the above technical solution, when the first connecting rod moves with the moving block, its two ends pass through the through groove and slide along the groove. The through groove provides guidance and limit for the first connecting rod to prevent it from deviating. At the same time, the connecting plate converts the linear motion of the first connecting rod into the rotational motion of pushing the first baffle through the rotational connection, ensuring that the angle adjustment process is stable and without jamming, and adapting to the coal blocking requirements under different working conditions.
[0017] Furthermore, the front side of the support frame is provided with two support rods that are rotatably connected to the bottom extension of the first baffle. The rear side of the first baffle is symmetrically distributed with ear plates. A second connecting rod is fixedly connected between the two ear plates. Both ends of the second connecting rod pass through the ear plates and are rotatably connected to the end of the connecting plate away from the first connecting rod.
[0018] By adopting the above technical solution, the support rod serves as the bottom rotation fulcrum of the first baffle, ensuring that it can rotate flexibly around the bottom end. When the connecting plate is pushed by the first connecting rod, the connecting plate drives the second connecting rod to move. The second connecting rod pulls or pushes the first baffle through the ear plate. Combined with the fulcrum effect of the support rod, the tilt angle of the first baffle can be precisely adjusted, such as increasing the angle to adapt to thick coal seams and decreasing the angle to adapt to thin coal seams, while ensuring the structural stability of the first baffle during the adjustment process.
[0019] Furthermore, the transmission mechanism includes a transmission box fixedly installed on the top of the base plate. A worm gear is rotatably connected to the top and bottom inner wall of the transmission box. The top of the worm gear extends through the transmission box to the outside and is fixedly connected to a turntable.
[0020] By adopting the above technical solution, the operator drives the worm gear to rotate within the transmission box by rotating the turntable. The transmission box provides support and protection for the worm gear, preventing coal dust from entering and affecting the transmission. The turntable is designed for easy manual operation, allowing for flexible control of the worm gear's rotation direction and angle according to actual coal blocking requirements, thereby adjusting the tilt angle of the first baffle. Operation is simple and labor-saving.
[0021] Furthermore, one end of the threaded rod extends through the support frame into the interior of the transmission box, and a worm gear is fixedly connected to the outside of the threaded rod, the worm gear meshing with the worm.
[0022] By adopting the above technical solution, when the worm rotates, it drives the threaded rod to rotate through meshing transmission with the worm wheel. Since the worm wheel and worm gear transmission has self-locking properties, after adjustment, it can prevent the threaded rod from rotating on its own due to external forces such as coal gangue impact, ensuring the stability of the first baffle angle. At the same time, the deceleration characteristics of the worm wheel and worm gear can convert the small rotation of the turntable into the precise rotation of the threaded rod, realizing the fine adjustment of the angle and improving the coal blocking accuracy.
[0023] Compared with the prior art, the present invention has the following beneficial effects:
[0024] (1) This utility model discloses a coal-blocking structure for a coal mining machine. When coal and gangue impact the second baffle, the first and second springs, along with the telescopic rod and X-shaped support plate, can efficiently buffer and disperse the impact force. The first spring compresses and absorbs most of the impact energy, preventing the second baffle from being deformed due to excessive instantaneous force. The X-shaped support plate disperses the impact force to four fixed columns, enhancing overall stability. When the second baffle tilts or partially shifts, the second spring counteracts the offset force and corrects the position. Together with the support plate, it further distributes the impact force and limits excessive displacement, significantly improving the durability of the coal-blocking structure and reducing the number of equipment maintenance times and costs caused by component damage.
[0025] (2) The present invention provides a coal blocking structure for a coal mining machine. Through the cooperation of the worm gear and worm wheel in the transmission mechanism and the threaded rod and moving block in the angle adjustment mechanism, the operator can easily adjust the coal blocking angle of the first baffle by rotating the turntable. The self-locking property of the worm gear transmission ensures the stability of the angle after adjustment and prevents it from changing due to external interference. Its deceleration characteristics can also achieve fine adjustment of the angle, so that the coal blocking structure can be flexibly adjusted according to different coal seam thicknesses and coal mining directions, effectively guiding the coal to slide down to the scraper conveyor, reducing coal splashing, improving coal collection efficiency, and ensuring the efficient and safe operation of underground coal mining. Attached Figure Description
[0026] Figure 1 This is a schematic diagram of a coal-blocking structure for a coal mining machine according to the present invention.
[0027] Figure 2This is a cross-sectional view of the transmission box of a coal-blocking structure for a coal mining machine according to this utility model.
[0028] Figure 3 This is a schematic diagram of the second baffle structure of a coal-blocking structure for a coal mining machine according to the present invention.
[0029] In the diagram: 1. Base plate; 2. Support frame; 3. Angle adjustment mechanism; 4. Transmission mechanism; 5. First baffle; 6. Protective frame; 7. Second baffle; 8. Fixed column; 9. X-shaped support plate; 10. Ring; 11. Telescopic rod; 12. First spring; 13. U-shaped plate; 14. First movable block; 15. Second movable block; 16. First round rod; 17. Second round rod; 18. Second spring; 19. First U-shaped seat; 20. Second U-shaped seat; 21. Support rotating plate; 22. Threaded rod; 23. Transmission box; 24. Worm gear; 25. Worm; 26. Turntable; 27. Moving block; 28. Moving rod; 29. Through groove; 30. First connecting rod; 31. Connecting plate; 32. Ear plate; 33. Support rod; 34. Second connecting rod. Detailed Implementation
[0030] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.
[0031] To prevent problems such as easy deformation and damage of the baffle plate under the impact of coal and gangue in traditional coal retaining structures, difficulty in flexibly adjusting the coal retaining angle leading to coal splashing and scattering, and insufficient buffering capacity causing frequent component replacements, and to improve the impact resistance and durability of coal retaining structures, their flexibility in adapting to different working conditions, and the safety and efficiency of coal mining operations, thereby reducing mining costs and equipment downtime, such as... Figure 1 , Figure 2 , Figure 3 As shown, a coal-blocking structure for a coal mining machine includes a base plate 1. A support frame 2 is fixedly connected to the top of the base plate 1. An angle adjustment mechanism 3 is provided on the support frame 2. A transmission mechanism 4 is provided on the base plate 1 and is pulsatorically connected to the angle adjustment mechanism 3. A first baffle 5 is provided on the front side of the angle adjustment mechanism 3. A protective frame 6 is fixedly connected to the front edge of the first baffle 5. A second baffle 7 is provided on the inner side of the protective frame 6. Four fixed columns 8 are fixedly connected to the front side of the first baffle 5. An X-shaped support plate 9 is connected to the front side of the four fixed columns 8. An array of telescopic rods 11 is provided on the front side of the X-shaped support plate 9. A ring 10 is provided on the rear side of the second baffle 7 near the first baffle 5. The ring 10 is fixedly connected to the telescopic end of the telescopic rod 11. A first spring 12 is connected between the ring 10 and the X-shaped support plate 9, and the first spring 12 is sleeved on the outside of the telescopic rod 11.
[0032] The second baffle 7 has U-shaped plates 13 symmetrically distributed on its rear side. The inner side of the X-shaped support plate 9 is rotatably connected to two second movable blocks 15. The outer side of the second movable block 15 is equipped with a first round rod 16. The inner side of the first round rod 16 is slidably connected to a second round rod 17. The outer side of the second round rod 17 is connected to a first movable block 14. A second spring 18 is connected between the first movable block 14 and the first round rod 16. The second spring 18 is sleeved on the outside of the second round rod 17. The first movable block 14 is rotatably connected to the inner side of the U-shaped plate 13.
[0033] The second baffle 7 has a first U-shaped seat 19 symmetrically distributed on its rear side, and the first baffle 5 has a second U-shaped seat 20 symmetrically distributed on its front side. The inner sides of the two first U-shaped seats 19 and the two second U-shaped seats 20 are rotatably connected to two supporting rotating plates 21.
[0034] When in use, when the coal or gangue cut by the cutting drum of the coal mining machine hits the second baffle 7, the second baffle 7, as a directly force-bearing component, will be subjected to a forward impact force and will be displaced to the rear.
[0035] During this process, the ring 10 on the rear side of the second baffle 7 moves backward synchronously, squeezing the first spring 12 sleeved on the outside of the telescopic rod 11. The first spring 12 generates elastic restoring force due to compression, which can buffer most of the impact force and prevent the second baffle 7 from deforming or being damaged due to excessive instantaneous force. At the same time, the telescopic rod 11 is connected to the fixed column 8 through the X-shaped support plate 9, providing stable support and guidance for the second baffle 7 and preventing its lateral displacement. The cross structure of the X-shaped support plate 9 can disperse the impact force to the four fixed columns 8, further enhancing the impact resistance of the overall structure.
[0036] When the second baffle 7 tilts backward or undergoes local displacement under force, the U-shaped plate 13 on its rear side will drive the first movable block 14 to move. The first movable block 14 pulls the second round rod 17 to slide along the inner side of the first round rod 16. At this time, the second spring 18 sleeved on the outside of the second round rod 17 is stretched or compressed, and the resulting elastic force can counteract the local displacement force of the second baffle 7, playing a role in auxiliary buffering and position correction. The rotational connection between the second movable block 15 and the X-shaped support plate 9 can adapt to the angle changes of the second round rod 17 and the first round rod 16, ensuring that the buffer structure flexibly responds to impact forces in different directions.
[0037] In addition, the supporting rotary plate 21 between the first U-shaped seat 19 on the rear side of the second baffle 7 and the second U-shaped seat 20 on the front side of the first baffle 5 will rotate as the second baffle 7 moves. The supporting rotary plate 21 further distributes the impact force through its own rotational deformation, while limiting the excessive displacement of the second baffle 7. Together with the limiting effect of the protective frame 6 on the edge of the second baffle 7, it ensures that it always works stably within the preset range, effectively blocking coal from splashing to both sides and guiding coal to slide down the curved surface of the second baffle 7 into the scraper conveyor.
[0038] For example, such as Figure 2 As shown, the present invention also includes the angle adjustment mechanism 3, which includes a threaded rod 22 rotatably connected to the front and rear inner walls of the support frame 2. A movable block 27 is threadedly connected to the outer side of the threaded rod 22. Movable rods 28 are fixedly connected to both ends of the movable block 27. A first connecting rod 30 is fixedly connected to one end of each of the two movable rods 28 that are opposite to each other.
[0039] When in use, when it is necessary to adjust the coal blocking angle of the first baffle 5 to adapt to different coal seam thicknesses or coal mining directions, the rotation of the threaded rod 22 will drive the moving block 27 connected by the outer thread to move along the axial direction of the threaded rod 22. The moving block 27 drives the moving rods 28 at both ends to move synchronously, and then transmits power to the connecting plate 31 connected afterward through the first connecting rod 30, and finally drives the first baffle 5 to adjust the tilt angle around the rotation fulcrum, so as to achieve precise control of the coal blocking direction.
[0040] For example, such as Figure 1 , Figure 2 As shown, the present invention also includes through grooves 29 on the inner walls of both ends of the support frame 2, and the opposite ends of the two first connecting rods 30 extend through the through grooves 29 to the outer wall and are rotatably connected to the connecting plate 31.
[0041] When in use, the first connecting rod 30 moves with the moving block 27, and its two ends pass through the through groove 29 and slide along the groove. The through groove 29 provides guidance and limit for the first connecting rod 30 to prevent it from deviating. At the same time, the connecting plate 31 converts the linear motion of the first connecting rod 30 into the rotational motion of pushing the first baffle 5 through rotational connection, ensuring that the angle adjustment process is stable and without jamming, and adapting to the coal blocking requirements under different working conditions.
[0042] For example, such as Figure 1 As shown, the present invention also includes two support rods 33 rotatably connected to the bottom extension of the first baffle 5 on the front side of the support frame 2, ear plates 32 symmetrically distributed on the rear side of the first baffle 5, and a second connecting rod 34 fixedly connected between the two ear plates 32. Both ends of the second connecting rod 34 pass through the ear plates 32 and are rotatably connected to the end of the connecting plate 31 away from the first connecting rod 30.
[0043] In use, the support rod 33 serves as the bottom fulcrum of the first baffle 5, ensuring that it can rotate flexibly around the bottom end. When the connecting plate 31 is pushed by the first connecting rod 30, the connecting plate 31 drives the second connecting rod 34 to move. The second connecting rod 34 pulls or pushes the first baffle 5 through the ear plate 32. Combined with the fulcrum effect of the support rod 33, the tilt angle of the first baffle 5 can be precisely adjusted, such as increasing the angle to adapt to thick coal seams and decreasing the angle to adapt to thin coal seams, while ensuring the structural stability of the first baffle 5 during the adjustment process.
[0044] For example, such as Figure 1 , Figure 2 As shown, the present invention also includes a transmission mechanism 4 comprising a transmission box 23 fixedly installed on the top of the base plate 1. A worm gear 25 is rotatably connected to the inner wall of the bottom end of the transmission box 23. The top end of the worm gear 25 extends through the transmission box 23 to the outside and is fixedly connected to a turntable 26.
[0045] In use, the operator drives the worm gear 25 to rotate within the transmission box 23 by rotating the turntable 26. The transmission box 23 provides support and protection for the worm gear 25, preventing coal dust from entering and affecting the transmission. The turntable 26 is designed for easy manual operation, allowing for flexible control of the rotation direction and angle of the worm gear 25 according to actual coal blocking requirements, thereby adjusting the tilt angle of the first baffle 5. The operation is simple and labor-saving.
[0046] For example, such as Figure 1 , Figure 2 As shown, the present invention also includes a threaded rod 22, one end of which extends through the support frame 2 into the interior of the transmission box 23, and a worm gear 24 is fixedly connected to the outer side of the threaded rod 22, the worm gear 24 meshing with the worm 25.
[0047] When in use, the worm 25 rotates and drives the threaded rod 22 to rotate through the meshing transmission with the worm wheel 24. Since the worm wheel and worm gear transmission has self-locking properties, after adjustment, it can prevent the threaded rod 22 from rotating on its own due to external forces such as coal gangue impact, ensuring the stability of the angle of the first baffle 5. At the same time, the deceleration characteristics of the worm wheel and worm gear can convert the small rotation of the turntable 26 into the precise rotation of the threaded rod 22, realize the fine adjustment of the angle, and improve the coal blocking accuracy.
[0048] It should be noted that this utility model is a coal-blocking structure for a coal mining machine. First, the operator rotates the turntable 26 at the top of the transmission box 23 in the transmission mechanism 4, driving the worm gear 25 to rotate. Through the meshing of the worm gear 25 and the worm wheel 24, the threaded rod 22 in the angle adjustment mechanism 3 is rotated, causing the threaded moving block 27 connected to the threaded rod 22 to move axially. The moving rods 28 at both ends of the moving block 27 then drive the first connecting rod 30 to slide along the through groove 29 of the support frame 2. The first connecting rod 30 pushes the second connecting rod 34 through the connecting plate 31. Combined with the fulcrum effect of the front support rod 33 of the support frame 2, the first connecting rod 30 moves axially. The baffle 5 rotates around its bottom end to adjust to a suitable coal-blocking angle. During coal mining operations, the cut coal gangue impacts the second baffle 7, causing it to move backward. This causes the ring 10 to compress the first spring 12 outside the telescopic rod 11. The X-shaped support plate 9 disperses the impact force. At the same time, the U-shaped plate 13 drives the first movable block 14 to make the second round rod 17 slide along the first round rod 16 and stretch or compress the second spring 18. The support rotating plate 21 rotates with the second baffle 7 to share the impact force and limit excessive displacement. The protective frame 6 limits the edge and finally guides the coal to slide down to the scraper conveyor. After the operation is completed, the turntable 26 can be rotated in the opposite direction to reset the structure.
[0049] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A coal-blocking structure for a coal mining machine, comprising a base plate (1), characterized in that, A support frame (2) is fixedly connected to the top of the base plate (1). An angle adjustment mechanism (3) is provided on the support frame (2). A transmission mechanism (4) is provided on the base plate (1) and is connected to the angle adjustment mechanism (3). A first baffle (5) is provided on the front side of the angle adjustment mechanism (3). A protective frame (6) is fixedly connected to the front edge of the first baffle (5). A second baffle (7) is provided on the inner side of the protective frame (6). Four fixed supports are fixedly connected to the front side of the first baffle (5). Fixed columns (8), the front sides of the four fixed columns (8) are connected to X-shaped support plates (9), the front sides of the X-shaped support plates (9) are provided with arrayed telescopic rods (11), the second baffle (7) is provided with a ring (10) near the rear side of the first baffle (5), the ring (10) is fixedly connected to the telescopic end of the telescopic rod (11), the ring (10) is connected to the X-shaped support plate (9) with a first spring (12), and the first spring (12) is sleeved on the outside of the telescopic rod (11); The second baffle (7) has U-shaped plates (13) symmetrically distributed on its rear side. The inner side of the X-shaped support plate (9) is rotatably connected to two second movable blocks (15). The outer side of the second movable block (15) is equipped with a first round rod (16). The inner side of the first round rod (16) is slidably connected to a second round rod (17). The outer side of the second round rod (17) is connected to a first movable block (14). A second spring (18) is connected between the first movable block (14) and the first round rod (16). The second spring (18) is sleeved on the outside of the second round rod (17). The first movable block (14) is rotatably connected to the inner side of the U-shaped plate (13). The rear side of the second baffle (7) is symmetrically distributed with a first U-shaped seat (19), and the front side of the first baffle (5) is symmetrically distributed with a second U-shaped seat (20). The inner sides of the two first U-shaped seats (19) and the two second U-shaped seats (20) are rotatably connected with two support plates (21).
2. The coal-blocking structure for a coal mining machine according to claim 1, characterized in that: The angle adjustment mechanism (3) includes a threaded rod (22) rotatably connected to the front and rear inner walls of the support frame (2). A moving block (27) is threadedly connected to the outer side of the threaded rod (22). Moving rods (28) are fixedly connected to both ends of the moving block (27). A first connecting rod (30) is fixedly connected to the opposite ends of the two moving rods (28).
3. The coal-blocking structure for a coal mining machine according to claim 2, characterized in that: The inner walls of both ends of the support frame (2) are provided with through grooves (29), and the opposite ends of the two first connecting rods (30) extend through the through grooves (29) to the outer wall and are rotatably connected to the connecting plate (31).
4. The coal-blocking structure for a coal mining machine according to claim 3, characterized in that: The front side of the support frame (2) is provided with two support rods (33) that are rotatably connected to the bottom extension of the first baffle (5). The rear side of the first baffle (5) is symmetrically distributed with ear plates (32). A second connecting rod (34) is fixedly connected between the two ear plates (32). Both ends of the second connecting rod (34) pass through the ear plates (32) and are rotatably connected to the end of the connecting plate (31) away from the first connecting rod (30).
5. The coal-blocking structure for a coal mining machine according to claim 1, characterized in that: The transmission mechanism (4) includes a transmission box (23) fixedly installed on the top of the base plate (1). The top of the transmission box (23) is rotatably connected to the inner wall of the bottom end with a worm gear (25). The top of the worm gear (25) extends through the transmission box (23) to the outside and is fixedly connected to a turntable (26).
6. A coal-blocking structure for a coal mining machine according to claim 2, characterized in that: One end of the threaded rod (22) extends through the support frame (2) into the interior of the transmission box (23), and a worm gear (24) is fixedly connected to the outside of the threaded rod (22), which meshes with the worm (25).