A tail shovel plate for a coal mine conveyor belt

Abstract

This utility model discloses a tail shovel plate for a coal mine conveyor belt, including a vertical plate positioned near the tail drum. The vertical plate is vertically oriented and its bottom end is attached to the top surface of the lower conveyor belt. Both sides of the vertical plate are fixed to a support. An upper baffle is also connected to the top of the vertical plate, and the upper part of the upper baffle is inclined towards the head drum. This utility model can collect debris on the lower conveyor belt through the vertical plate. By installing the upper baffle on the vertical plate, it can prevent debris accumulated on the front face of the vertical plate from flipping over from above the vertical plate, thus avoiding the collected debris from entering the tail drum. This improves the cleaning effect of debris on the lower conveyor belt and prevents debris from entering the drum.

Description

Technical Field

[0001] This utility model belongs to the technical field of coal mine transportation equipment, and in particular relates to a tail shovel plate for a coal mine belt conveyor. Background Technology

[0002] Coal mine belt conveyors (full name: coal mine belt conveyors) are core continuous conveying equipment in coal mine production. They are mainly used for transporting raw coal, gangue, and other materials. They are widely used in underground mining areas, tunneling faces, mine bottom yards, and surface coal preparation plants. They are the "transportation artery" connecting coal mining, hoisting, and processing. They are characterized by large conveying capacity, high efficiency, low energy consumption, and adaptability to complex working conditions, and are crucial to ensuring continuous coal mine production.

[0003] The existing coal shovel plate is not very effective in reducing spillage (i.e., spilled coal, gangue, and other debris) at the tail joint of the conveyor belt, resulting in a large amount of manual cleaning work. In view of this situation, in order to greatly reduce spillage at the tail joint of the conveyor belt, reduce the difficulty of manual cleaning, and facilitate installation, it is urgent to design and manufacture an improved coal shovel plate. Utility Model Content

[0004] The purpose of this invention is to provide a tail shovel plate for a coal mine conveyor belt, which improves the cleaning effect of debris on the lower conveyor belt and prevents debris from entering the drum.

[0005] The present invention adopts the following technical solution: a tail shovel plate for a coal mine conveyor belt, comprising a vertical plate arranged near the tail drum, the vertical plate being arranged vertically and its bottom end being in contact with the top surface of the lower conveyor belt; The two sides of the upright plate are fixed to the bracket; The top of the upright plate is also connected to an upper baffle, the upper part of which is inclined toward the head roller. The angle between the upright plate and the upper baffle is 120°~150°. The beneficial effects of this utility model are: This utility model can collect debris on the lower belt through the upright plate. By installing a baffle on the upright plate, it can prevent the debris accumulated on the front face of the upright plate from flipping over from above the upright plate, and avoid the collected debris from mixing into the tail roller. This improves the cleaning effect of debris on the lower belt and prevents debris from entering the roller. Attached Figure Description

[0006] Figure 1 This is a schematic diagram illustrating the usage state of a tail shovel plate for a coal mine conveyor according to an embodiment of the present invention. Figure 2 This is a side view of the tail shovel plate of a coal conveyor belt in a coal mine, according to an embodiment of the present invention.

[0007] Among them: 10. Upper belt; 20. Tail roller; 30. Head roller; 40. Lower idler roller; 50. Lower belt; 60. Support frame; 70. Coal retaining plate; 71. Vertical plate; 72. Upper baffle; 73. Shovel plate; 74. Unloading area. Detailed Implementation

[0008] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0009] Existing coal shovels, when installed at the tail end of coal mine conveyor belts, fail to effectively control coal spillage in the area where the tail drum 20 overlaps with the lower conveyor belt. This results in a large amount of coal scattering around the equipment, increasing manual cleaning workload and posing safety hazards. Furthermore, traditional coal shovels suffer from poor structural stability, complex connection methods to supports, time-consuming and labor-intensive installation, and inconvenient maintenance. Additionally, during conveyor belt operation, the lack of effective flow guidance and blocking mechanisms causes the cleaned coal to easily splash outwards, causing secondary pollution and affecting the cleanliness of the working environment and the normal operation of the equipment. To address these issues, a new type of coal shovel device is urgently needed that can efficiently scrape away residual coal, effectively prevent material spillage, and is easy to install and structurally stable.

[0010] This utility model discloses a tail shovel plate for a conveyor belt in a coal mine, such as... Figure 1 As shown, the belt conveyor includes a head pulley 30 and a tail pulley 20. Belts are wound around the head pulley 30 and the tail pulley 20. The belt located above the pulleys is called the upper belt 10, and the belt located below the pulleys is called the lower belt 50. Furthermore, an upper idler roller (not shown in the figure) is located below the upper belt 10, and a lower idler roller 40 is located below the lower belt 50. A coal retaining plate 70 (near the tail pulley 20) is provided between the upper belt 10 and the lower belt 50.

[0011] The coal retaining plate 70 includes a vertical plate 71 located near the tail drum 20. The vertical plate 71 is vertically arranged and its bottom end is attached to the top surface of the lower belt 50. The two sides of the vertical plate 71 are fixed on the bracket 60. The top of the vertical plate 71 is also connected to an upper baffle 72, and the upper part of the upper baffle 72 is inclined towards the head drum 30. The included angle between the vertical plate 71 and the upper baffle 72 is 120°~150°.

[0012] In this embodiment, a composite cleaning assembly consisting of a vertical plate 71 and an upper baffle 72 is used to efficiently intercept and orderly guide residual coal (or gangue and other debris) on the lower conveyor belt 50, thereby improving coal cleaning efficiency and reducing material spillage. The structure possesses good mechanical stability and spatial adaptability, can be adapted to different types of belt conveyor systems, and can be mass-produced using standardized processes, making it highly valuable for engineering applications.

[0013] This utility model can collect debris on the lower belt 50 by using the upright plate 71. By installing a baffle 72 on the upright plate 71, it can prevent debris accumulated on the front face of the upright plate 71 from flipping over from above the upright plate 71, thus avoiding the collected debris from mixing into the tail roller 20. This achieves the effect of cleaning debris on the lower belt 50 and prevents debris from entering the roller.

[0014] The vertical plate 71 is one of the core functional components of this utility model. Its main function is to physically scrape away residual coal (or gangue and other debris) carried to the tail drum 20 area by the lower belt 50. The vertical plate 71 is arranged vertically, meaning its main plane is basically perpendicular to the ground or the belt running plane, ensuring that its bottom edge can maintain full contact with the top surface of the lower belt 50, thereby forming a continuous scraping action during the continuous operation of the belt. The vertical plate 71 can be made of metal materials, such as Q235 carbon structural steel or wear-resistant alloy steel plate, with a thickness between 3mm and 8mm, and 4mm is optional, to balance strength and ease of processing. The width of the vertical plate 71 can be matched with the actual width of the lower belt 50, usually slightly larger than the width of the lower belt 50 to prevent coal leakage at the edges; its height is determined according to the installation space near the tail drum 20 and the required coal scraping range, generally adjusted within the range of 200mm to 500mm. The bottom of the upright plate 71 is polished to form a smooth transition edge, avoiding damage to the belt surface due to the sharp angle structure.

[0015] The vertical plate 71 is positioned close to the tail pulley 20, meaning its installation location is near the turning point where the lower belt 50 is about to enter the tail pulley 20, maximizing the capture of loose coal falling from or adhering to the belt in the pulley's rotation area. This location is chosen based on analysis of the belt's running trajectory and material shedding patterns, ensuring effective interception of coal before it enters the tail pulley 20. The vertical plate 71 is fixed to the external support structure—the bracket 60—by welding or bolting. The bracket 60 itself is a rigid component, typically constructed of channel steel or I-beams, installed on the belt conveyor's foundation frame to support the entire coal shovel assembly and ensure its structural stability under vibration and impact conditions.

[0016] Furthermore, the two sides of the vertical plate 71 are connected to the bracket 60 respectively. This double-sided fixing method significantly improves the overall structure's torsional resistance and seismic performance, avoiding skewness or deformation caused by unilateral force. The connection points can be equipped with elongated holes (such as elliptical through holes of φ20×90mm) to allow for fine-tuning during installation, improving assembly flexibility and on-site adaptability. This design is particularly suitable for complex downhole working conditions, facilitating later disassembly, maintenance, and component replacement.

[0017] The upper baffle 72 is connected to the top of the vertical plate 71, forming a continuous protective barrier. Its main function is to guide and restrain the coal pushed upward by the vertical plate 71, preventing it from splashing to the other side of the vertical plate 71. The upper part of the upper baffle 72 is inclined towards the head roller 30, that is, its top end is closer to the direction of belt travel than its bottom end, forming a forward-facing guide slope. This inclination angle can be set according to actual needs, but overall, together with the vertical plate 71, it forms an open "V" shaped cross-section structure, which facilitates the material to slide inward along the slope onto the belt bearing surface. The upper baffle 72 can also be made of the same material as the vertical plate 71, with the same or slightly thinner thickness, and the surface can be treated with anti-rust treatment such as painting or galvanizing to extend its service life.

[0018] The angle between the vertical plate 71 and the upper baffle 72 is 120°~150°. This angle range has been verified through multiple experiments and achieves a good balance between structural strength, material flowability, and space occupation. When the angle is less than 120°, the transition area between the two plates is too narrow, which can easily cause coal accumulation or even blockage, affecting coal cleaning efficiency. When the angle exceeds 150°, the upper baffle 72 tends to be horizontal, losing its proper guiding function, which may cause the cleaned coal to slide directly to the bottom of the equipment, exacerbating the spillage problem. Therefore, controlling the angle within the range of 120°~150° ensures sufficient flow space while maintaining reasonable guiding performance, allowing the scraped coal to smoothly fall back along the surface of the upper baffle 72 to the center area of ​​the conveyor belt and re-enter the transportation process.

[0019] The connections between components can be completed using shielded metal arc welding (SMAW), a mature and reliable process suitable for on-site construction. All welds must be ground to remove burrs and oxide layers, ensuring a smooth surface and preventing damage to the conveyor belt or coal accumulation. The entire coal shovel assembly is a standalone modular unit that can be prefabricated on the ground and hoisted to the installation location as a whole, significantly reducing on-site operation time.

[0020] The above technical solution effectively controls coal spillage on the lower conveyor belt 50. Because the vertical plate 71 is vertically positioned and its bottom end is close to the top surface of the lower conveyor belt 50, it can continuously scrape off adhering coal particles during belt operation, significantly reducing the amount of coal accumulated at the tail end. Since the vertical plate 71 is fixed to the support 60 on both sides, the rigidity and durability of the overall structure are improved, adapting to high-load, high-vibration working environments. Because the upper baffle 72 is located on top of the vertical plate 71 and tilts towards the head roller 30, it forms an effective secondary blocking and guiding structure, preventing coal from splashing outwards during cleaning. Since the angle between the vertical plate 71 and the upper baffle 72 is limited to 120°~150°, the material flow path is optimized, preventing blockages while enhancing the guiding effect. In summary, this coal shovel plate structure not only improves coal cleaning efficiency and reduces the frequency of manual intervention and labor intensity, but also is easy to install and maintain, helping to improve the safety environment of coal mine operations and extend the service life of the belt conveyor system.

[0021] When existing coal shovels are used in underground coal mine belt conveyor systems, they commonly suffer from incomplete coal cleaning in the tail area, especially for highly adhesive materials such as damp coal slurry and compacted coal lumps adhering to the top surface of the lower conveyor belt. Conventional vertical scraper structures struggle to effectively remove these residues. Long-term accumulation of these residues can lead to belt misalignment, drum slippage, and accelerated wear of idlers, resulting in frequent equipment failures and decreased operating efficiency. Furthermore, incomplete coal cleaning necessitates frequent manual entry into confined spaces for cleaning operations, increasing labor intensity and posing safety hazards. Additionally, some traditional coal shovels have complex structures, are difficult to install and position, and are inconvenient for maintenance and disassembly, further hindering their practical application.

[0022] In one embodiment, the bottom of the upright plate 71 is also connected to a shovel plate 73, the front end of which is in contact with the top surface of the lower belt 50.

[0023] This embodiment adds a bottom shovel plate to the existing vertical plate structure to form a composite coal cleaning component, thereby improving the ability to remove residues from the surface of the lower conveyor belt. The vertical plate 71, serving as the main support and initial coal scraping component, is vertically arranged, with its bottom end close to the running surface of the lower conveyor belt 50. It can block most of the loose coal falling from above or carried by the belt surface when the belt passes through the reversing zone of the tail pulley 20, preventing it from reaching the tail overlap area. The bracket 60 is used to stably fix the entire coal shovel plate structure to the conveyor frame, ensuring that the vertical plate 71 remains in position during operation, avoiding displacement due to vibration or impact that could lead to coal cleaning failure or belt damage. The upper baffle 72 is connected to the top of the vertical plate 71 and extends obliquely towards the upstream head pulley 30, forming a material guiding and anti-splash structure. It can guide the blocked coal forward back onto the main conveyor belt, reducing dust and secondary spillage.

[0024] Specifically, the shovel plate 73 is located at the bottom of the vertical plate 71 and extends downwards from the front end for a certain length, with its front edge in contact with the top surface of the lower conveyor belt 50. As a newly added core coal cleaning element, the shovel plate 73 is mainly used to address potential coal cleaning blind spots at the bottom of the vertical plate 71—that is, when coal, especially wet, sticky coal slime, adheres to the conveyor belt surface, the squeezing action of the vertical plate alone is often insufficient to completely remove it. The shovel plate 73, however, uses its leading edge to cut in, utilizing the relative motion of the conveyor belt to generate shear force, gradually peeling away the adhesive layer. This structure enhances the initiative and depth of the coal cleaning action, overcoming the limitations of the passive obstruction of traditional scrapers.

[0025] The front end of the shovel plate 73 can be machined into a sharp edge to enhance its cutting ability; alternatively, a rounded front end with a certain curvature can be selected according to the actual working conditions to balance the relationship between coal cleaning effect and belt protection. In addition, the length of the shovel plate 73 can be optimized according to the running speed of the lower belt 50 and the characteristics of the coal, usually in the range of 50~150mm, which can ensure sufficient contact time without stress concentration or deformation due to excessive length.

[0026] The above components work together. When the belt conveyor is running, the lower belt 50 carries the coal adhering to its surface through the tail area. First, it is initially blocked and guided by the upper baffle 72, and larger pieces of material are guided back to the main transport path. Then, the vertical plate 71 vertically intercepts the remaining loose material to prevent it from spreading backward. Finally, the shovel 73 at the front end comes into direct contact with the belt surface. Under continuous friction and shearing action, the stubborn coal sludge or fine particles are gradually scraped off, achieving deep cleaning.

[0027] The above technical solution significantly enhances the coal cleaning capacity of the conveyor tail area. By adding a shovel plate 73 at the bottom of the vertical plate 71, which adheres to the top surface of the lower conveyor belt 50, previously difficult-to-remove adhesive materials are actively peeled off, effectively reducing spillage at the tail joint. This design improves the thoroughness and reliability of coal cleaning, and reduces the frequency and intensity of manual cleaning. Simultaneously, through reasonable configuration of structural parameters and connection methods, the device ensures convenient installation and operational stability, making it suitable for conveyor tail protection retrofits in various coal mine transportation scenarios.

[0028] When existing coal shovels are used in underground coal mine belt conveyor systems, their poor structural design often leads to low coal cleaning efficiency. Particularly in the overlap area between the tail pulley 20 and the lower belt 50, coal, especially wet and sticky coal slime, is prone to spillage and accumulation during operation. Traditional flat coal shovels have a straight front end, resulting in a large contact area with the belt. This not only increases scraping resistance but also easily causes coal chunks or slime to accumulate at the front edge of the shovel, leading to blockages. Furthermore, the high friction accelerates wear on the shovel and belt surfaces, affecting equipment lifespan and increasing maintenance frequency and manual cleaning workload. Especially when dealing with high-moisture, high-viscosity coal materials, ordinary shovels struggle to achieve continuous and smooth coal cleaning, severely impacting the stability and operational efficiency of the transportation system.

[0029] In this embodiment, by designing the shovel plate 73 as a wedge-shaped structure and setting a sharp front edge (i.e., a pointed front edge), the mechanical performance and applicability of the traditional shovel plate 73 in the coal cleaning process are significantly improved. This structure can effectively remove residual coal adhering to the surface of the lower conveyor belt 50 while reducing mechanical damage to the conveyor belt itself and improving overall operational stability.

[0030] The "shovel plate 73" refers to a functional component fixedly connected to the bottom of the vertical plate 71, used to directly contact and scrape off residual coal from the surface of the lower conveyor belt 50. Its installation position is close to the tail drum 20, directly above or adjacent to the lower conveyor belt's running track, and its main task is to strip loose coal from the belt surface. As the core actuator for the coal cleaning operation, this component must possess sufficient structural strength to resist long-term impact loads and frictional losses, while also having a reasonable geometric shape to optimize stress distribution.

[0031] The term "wedge" refers to the fact that the shovel plate 73 has a cross-sectional profile that gradually thickens from front to back. Its cross-section is approximately a triangular or trapezoidal variant, thinnest at the front and gradually increasing in height as it extends rearward. This shape mimics the design principle of a cutting edge, allowing the shovel plate 73 to cut into the material layer with a smaller initial contact area when it contacts the lower belt 50, thus reducing instantaneous shear resistance. This structure facilitates a gradual peeling process, avoiding severe vibrations or material rebound caused by sudden large-area contact. In actual manufacturing, the wedge angle can be adjusted according to specific working conditions. Typically, the leading edge inclination angle is controlled between 15° and 45°, ensuring good cutting ability without being too sharp and reducing structural durability.

[0032] "Sharp edge at the front" refers to the fact that the leading edge of the shovel plate 73 facing the head roller 30 is machined into a sharp, linear edge, rather than a rounded or straight end. This sharp edge can effectively pierce the agglomerated layer formed by wet coal, disrupt its cohesion, and prevent the entire sheet of coal slime from accumulating in front of the shovel plate 73 and causing blockage. The sharp edge structure can also guide the material upward along the shovel plate's inclined surface and smoothly guide it to the unloading side, avoiding stagnation. In terms of material selection, the shovel plate 73 can be made of high-strength wear-resistant steel plate, such as Q235 or Q345 carbon structural steel, which meets the rigidity requirements and facilitates on-site welding and installation. Furthermore, local heat treatment or welding of a wear-resistant layer (such as a Cr-Mo alloy coating) can be performed in the sharp edge area to extend its service life.

[0033] The specific implementation methods of the above-mentioned technical features include, but are not limited to, the following forms: In one embodiment, the shovel plate 73 is formed by shearing and bending a 4mm thick Q235 steel plate, and then fixed to the bottom of the upright plate 71 by manual arc welding; its front end is formed with a sharp edge less than 1mm wide by mechanical grinding or cutting, and the length of the wedge-shaped part is about 100mm to 150mm to ensure a smooth transition. In another alternative, the wedge-shaped shovel plate can be formed in one piece by die stamping to improve dimensional accuracy and consistency; alternatively, composite materials can be used to cover the sharp edge area to enhance corrosion resistance and wear resistance. In addition, in high-wear environments, a replaceable cutting edge module can be set, so that only the cutting edge part is replaced when the sharp edge wears to a certain extent, reducing maintenance costs.

[0034] The wedge-shaped structure and sharp edges together form a low-resistance, high-penetration coal-cleaning front end. This allows the shovel to first cut into the coal seam with its sharp edge upon contact with the lower conveyor belt 50, then push the material upwards and out using the gradually thickening cross-section. The entire process is characterized by uniform force distribution and dynamic stability. The vertical plate 71 provides a stable support foundation for the shovel, ensuring it does not deform or loosen under continuous vibration and load conditions. The support frame 60 further enhances the rigid connection of the overall structure, guaranteeing long-term reliable operation of the equipment.

[0035] The above technical solution effectively removes coal residue from the tail area of ​​the belt conveyor. The wedge-shaped shovel 73 with a pointed tip reduces the contact area and frictional resistance with the coal, improving cleaning efficiency. The pointed tip can pierce wet coal clumps, preventing material accumulation and blockage. Simultaneously, the progressive cutting method reduces the risk of scratching the surface of the lower belt 50, minimizing belt wear and extending the service life of key components. This design is particularly suitable for transporting humid, highly viscous coal, significantly reducing the burden of manual cleaning and improving the automation level and operational safety of the belt conveyor system.

[0036] When existing coal shovels are installed at the tail end of coal mine conveyor belts, material tends to accumulate in the middle of the front face of the vertical plate during coal cleaning, forming a localized high-load area. This leads to poor material discharge, increased risk of blockage, and consequently affects overall coal cleaning efficiency. Furthermore, due to the lack of an effective guiding structure, coal is difficult to discharge evenly to both sides. Long-term operation can cause accelerated equipment wear, increased maintenance frequency, and a large workload for manual cleaning. Moreover, disassembly and assembly are inconvenient during maintenance, affecting operational safety and efficiency. To solve these problems, it is urgent to optimize the structure of the front face of the vertical plate to improve material flow characteristics and enhance discharge smoothness and system stability.

[0037] Specifically, the front end face of the vertical plate 71 has a unloading area 74; the unloading area 74 extends from the middle of the vertical plate 71 to both sides, and the height of the unloading area 74 gradually decreases along the extension direction. The gradual decrease in height along the extension direction forms a sloping structure that facilitates material diversion. This structure changes the movement path of coal during the cleaning process, preventing it from accumulating in the central area, thereby improving discharge efficiency and system reliability.

[0038] The vertical plate 71 is the main support and material-blocking component of the entire coal shovel. It is vertically installed and fixed to the bracket 60, with its bottom end flush against the top surface of the lower conveyor belt 50. It is used to block loose coal and other materials falling from the return section of the tail drum 20. The vertical plate 71 is typically made of metal, preferably a 4mm thick steel plate, possessing sufficient structural strength and wear resistance to ensure long-term stable operation in the high-dust, high-friction environment of underground coal mines. The width of the vertical plate 71 is greater than the width of the lower conveyor belt 50, ensuring coverage of the entire working surface of the conveyor belt and preventing material leakage at the edges. Its two sides are fixed to the bracket 60 by bolts or welding, and its installation position is close to the tail drum 20 to maximize the interception of spilled materials during the return journey.

[0039] The unloading area 74 is located on the front face of the vertical plate (71), i.e., the surface facing the incoming material direction. As a key functional structure, it guides the orderly discharge of coal that has entered the shoveling area. The unloading area 74 starts in the middle area of ​​the vertical plate 71 and extends symmetrically to the left and right sides, forming a laterally distributed discharge channel. More importantly, along this extension direction, the height of the unloading area 74 gradually decreases, that is, it smoothly transitions from the highest point in the middle to the lower positions on both sides, forming a guide surface similar to a "V" shape or an arc-shaped depression. This design with decreasing height breaks the symmetrical material accumulation pattern caused by traditional planar vertical plates, and uses gravity to make the coal slide naturally to both sides, avoiding the formation of material blockage in the central area.

[0040] The unloading area 74 can be implemented in several ways. In one embodiment, it is a groove structure excavated in the vertical plate 71, formed by machining or plasma cutting. The surface of the groove can be polished to reduce frictional resistance. In another embodiment, the unloading area 74 consists of two symmetrically arranged baffles, located on both sides of the vertical centerline of the vertical plate 71, connected to the front face by welding or other fixing methods. Their top contours are arranged in a gradually decreasing height manner, thereby enclosing a discharge space that is high in the middle and low on both sides. The baffles can be made of angle steel or flat steel, which has good structural rigidity and impact resistance. Regardless of whether a groove or baffle is used, the unloading area 74 should ensure a smooth and continuous surface, avoiding steps or sharp protrusions to prevent material jamming or accelerated wear.

[0041] The geometric parameters of the unloading area 74 can be adjusted according to actual working conditions. For example, its longitudinal extension length can cover 1 / 2 to 2 / 3 of the height of the upright plate 71, its width can extend through about 60%-80% of the middle area of ​​the upright plate, and the height difference can be set between 20mm and 60mm to balance material discharge efficiency and structural strength. The tilt angle is controlled within the range of 10° to 30° to ensure that the material can smoothly pass the central high point and slide out to the side after being pushed by the shovel plate 73.

[0042] This embodiment provides a discharge area with a clear flow path by designing the unloading area as a groove structure excavated on the surface of the vertical plate. This effectively improves the flow state of coal on the front surface of the coal shovel plate, avoids material retention and hanging, and improves the overall discharge efficiency.

[0043] The unloading area 74 is a groove excavated on the vertical plate 71. Specifically, the unloading area 74 refers to a functional area located on the front surface of the vertical plate 71, used to guide coal that has fallen or been scraped off from the return section of the lower conveyor belt 50 to be discharged to both sides. This area is not a planar structure, but rather a recessed space formed on the vertical plate 71 body by material removal, lower than the surrounding plate surface—that is, a groove structure. This groove can have a U-shaped, V-shaped, or trapezoidal cross-section, and its depth can be adjusted according to actual working conditions, generally 3mm to 8mm, its width between 50mm and 150mm, and its length starting from the middle of the vertical plate 71 and extending to the left and right sides near the edge. The bottom profile of the groove can be designed as flat or slightly curved to reduce flow resistance.

[0044] The unloading area 74 gradually decreases in height along the direction from the center of the vertical plate 71 to both sides, meaning that the depth of the groove or the height of the bottom of the groove gradually decreases from the center to both sides, forming a sloping guide surface. This design allows the coal falling into the unloading area to slide naturally to the left and right sides under the action of gravity, avoiding accumulation in the central area. This height change can be achieved through linear decrease or curved transition, with the inclination angle controlled between 5° and 15°, ensuring both fluidity and preventing splashing due to an excessively steep slope.

[0045] Compared to traditional raised baffles or flat reinforcement, the grooved structure has a lower degree of surface abruptness, reducing airflow disturbance and material eddies, which facilitates the smooth discharge of fine coal particles. Furthermore, because the grooves are located inside the plate surface, they are less susceptible to damage from external impacts, resulting in higher structural stability. In addition, this structure facilitates cleaning and maintenance; high-pressure water guns or scrapers can be used directly along the grooves, significantly reducing the difficulty of cleaning.

[0046] This embodiment provides a tail shovel plate structure for a belt conveyor in a coal mine transportation system. By setting a unloading area composed of symmetrical baffles on the front face of the vertical plate, it effectively guides and restricts the material flow direction during unloading, improving the orderliness and controllability of discharge. The specific meanings and implementation methods of each technical feature are as follows: The vertical plate 71, serving as the main supporting structure for the entire coal shovel assembly, is installed vertically at the tail end of the conveyor belt. Its bottom end is flush with the top surface of the lower belt 50 to prevent material leakage from below the belt. This vertical plate is typically made of metal, preferably a 4mm thick steel plate, possessing sufficient structural strength and wear resistance to withstand the impact and friction of materials during continuous operation. The two sides of the vertical plate 71 are fixed to the bracket 60 via bolts or other detachable connections, facilitating on-site installation and subsequent maintenance. The bracket 60 is an integral part of the original conveyor belt structure, used to support and position the coal shovel assembly.

[0047] The unloading area 74 is located on the front surface of the upright plate 71, above the shovel plate, and its function is to provide a directional discharge channel for materials disengaged from the conveyor belt. The unloading area extends from the middle of the upright plate 71 to the left and right sides, and its height gradually decreases in the direction of extension, forming a sloping structure that is high in the middle and low on both sides, so that the materials naturally slide to the sides.

[0048] Based on this, the unloading area 74 includes two symmetrically arranged baffles, which are symmetrically positioned relative to the vertical centerline of the upright plate 71. The unloading area 74 is bounded by the two symmetrically arranged baffles, which are located on both sides of the vertical centerline of the upright plate 71, in a mirror-symmetrical distribution. The baffles can be strip-shaped metal parts welded to the surface of the upright plate, with a cross-sectional shape that can be rectangular, trapezoidal, or semi-circular, a height that is generally 20mm to 50mm, and a length that covers the main discharge path of the unloading area.

[0049] The function of the baffles is to restrict the free diffusion of materials in the lateral direction, preventing them from directly impacting the front or scattering over a large area, thereby guiding the materials to the predetermined discharge area. The symmetrical arrangement ensures that the discharge channels on both sides have the same width, guaranteeing uniform material distribution and preventing structural imbalances or belt misalignment caused by unilateral accumulation. Simultaneously, this symmetrical structure matches the symmetrical layout of most belt conveyor systems, improving the overall coordination and installation adaptability of the device. The spacing between the baffles can be adjusted according to the belt width and material particle size, typically slightly less than 50mm of the effective working width of the lower belt to ensure full coverage.

[0050] The width of the vertical plate 71 is greater than the width of the lower conveyor belt 50, and both sides are fixed to the bracket 60. This technical solution optimizes the overall layout and installation structure of the vertical plate, improving the coal cleaning coverage area and the operational stability of the device. In this embodiment, the core solution lies in widening the vertical plate and using a double-sided fixing method to address the edge coal leakage problem caused by conveyor belt misalignment, and to enhance the overall vibration resistance.

[0051] The double-sided fixing between the upright plate 71 and the support 60 not only achieves spatial positioning, but more importantly, significantly improves the overall mechanical performance of the structure. Compared with single-sided fixing or central support, double-sided constraint effectively suppresses torsion, warping, or swaying phenomena caused by material impact or vibration loads on the upright plate, enhancing its bending and torsional stiffness. This structural arrangement is particularly suitable for use in the complex and frequently vibrating underground environment of coal mines, ensuring the long-term stable operation of the coal shovel plate without easy damage.

[0052] The above-mentioned technical elements work together and cooperate: the ultra-wide design of the vertical plate 71 provides physical coverage to ensure that comprehensive cleaning can be achieved regardless of whether the belt is off track; the double-sided fixation to the bracket 60 provides structural stability support to prevent functional failure due to external disturbances; the combination of the two enables the coal shovel plate to not only cope with the coal cleaning challenges under dynamic operating conditions, but also meet the actual needs of convenient installation and reliable operation and maintenance.

[0053] The above technical solution effectively addresses the problem of coal spillage at the tail of the belt conveyor. Because the width of the vertical plate 71 is greater than the width of the lower belt 50, it can cover the entire transport area of ​​the belt and the edge spillage area, solving the problem of edge coal leakage caused by belt misalignment. Simultaneously, since both sides of the vertical plate 71 are fixed to the support 60, the overall structural rigidity and vibration resistance are improved, preventing deformation or loosening of the equipment due to impact during operation and ensuring the continuous effectiveness of the coal cleaning function. This embodiment is particularly suitable for coal mine transportation scenarios with risks of belt misalignment, high difficulty in coal cleaning, and limited maintenance space, and can be widely applied in the design and modification of coal cleaning devices at the tail of various belt conveyors.

Claims

1. A tail shovel plate for a coal mine conveyor belt, characterized in that, Includes a vertical plate (71) located near the tail roller (20), the vertical plate (71) being arranged vertically and its bottom end being attached to the top surface of the lower belt (50); The two sides of the upright plate (71) are fixed on the bracket (60); The top of the vertical plate (71) is also connected to an upper baffle (72), the upper part of which is inclined toward the head roller (30); The included angle between the upright plate (71) and the upper baffle (72) is 120°~150°.

2. The tail shovel plate for a coal mine conveyor as described in claim 1, characterized in that, The bottom of the upright plate (71) is also connected to a shovel plate (73), the front end of which is in contact with the top surface of the lower belt (50).

3. The tail shovel plate for a coal mine conveyor as described in claim 2, characterized in that, The shovel plate (73) is wedge-shaped with a pointed front end.

4. A tail shovel plate for a coal mine conveyor as described in claim 2 or 3, characterized in that, The front end face of the upright plate (71) has an unloading area (74). The unloading area (74) extends from the middle of the upright plate (71) to both sides, and the height of the unloading area (74) gradually decreases along the extension direction.

5. A tail shovel plate for a coal mine conveyor as described in claim 4, characterized in that, The unloading area (74) is a groove excavated on the upright plate (71).

6. A tail shovel plate for a coal mine conveyor as described in claim 4, characterized in that, The unloading area (74) includes two symmetrically arranged baffles, which are symmetrically arranged with respect to the vertical center line of the upright plate (71).

7. A tail shovel plate for a coal mine conveyor as described in claim 5 or 6, characterized in that, The width of the upright plate (71) is greater than the width of the lower belt (50), and both sides of it are fixed to the bracket (60).

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