A decentralized telescopic system for a maintenance-friendly scraper reclaimer for crossheading

Abstract

The application relates to the technical field of coal mine machinery equipment, and discloses a decentralized telescopic system for a scraper transfer machine used in a maintenance-friendly crossheading, which comprises a decentralized telescopic assembly, the decentralized telescopic assembly comprises multiple telescopic landing section middle troughs which are connected in series, and the multiple telescopic landing section middle troughs are arranged at a landing section of the scraper transfer machine; each telescopic landing section middle trough comprises a base, a telescopic groove A is horizontally and slidably inserted at one side of the base, a telescopic groove B is horizontally and slidably inserted at the other side of the base, and a telescopic driving device is arranged on the base. By decentralizing the telescopic function to multiple middle troughs of the landing section, the weight of the machine head is reduced, the problems of sinking of the machine head and belt scratching are solved, the overall telescopic structure is simplified, the machining and transfer difficulty of parts is reduced, maintenance work is transferred to the ground, the labor intensity of on-site workers is effectively reduced, and the safety of equipment maintenance is improved.

Description

Technical Field

[0001] This application relates to the field of coal mine machinery and equipment technology, specifically a distributed telescopic system for an easy-to-maintain scraper conveyor in a roadway. Background Technology

[0002] Scraper conveyors for underground mining faces are crucial transfer equipment between conveyors and belt conveyors. In recent years, with the continuous increase in the size of coal mining equipment, the width of scraper conveyors for underground mining faces has also increased. However, with the increase in equipment size and width, problems such as excessive weight of the entire machine, difficulty in adjusting chain tension, and inconvenience in maintaining the telescopic cylinders have become increasingly apparent.

[0003] In existing transfer conveyor structures, the telescopic mechanism is typically housed within the telescopic head assembly. This traditional telescopic head is inherently heavy, and the total weight increases further when the power unit is added. All of this weight is supported on the transport roadway surface by the self-propelled belt conveyor tail located below the head. In actual underground operations, this excessive weight can easily cause the self-propelled belt conveyor tail to sink into the ground, allowing debris such as coal slurry and gangue to enter the lower conveyor belt. In severe cases, this can cause the conveyor to become stuck and unable to move, or the debris can cause scratches and breakage of the conveyor belt.

[0004] Meanwhile, adjusting the chain tension of traditional transfer machines requires the combined assembly of multiple components, including the head frame, telescopic chute, and hydraulic cylinders. This results in a complex overall structure, high precision requirements, and significant difficulties in transporting large parts underground. Furthermore, because the traditional telescopic head is positioned above the tail of the belt-driven conveyor, typically at a height of two to three meters above the ground, routine replacement and maintenance of the telescopic cylinders are extremely difficult on-site. After chain tension adjustment, the limited space between the power unit and the chute further restricts the operator's space for fixing and assembling the mechanical pins, complicating daily maintenance and ensuring safe production. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this application provides a distributed telescopic system for easy-to-maintain scraper transfer machines in roadways. This system solves the problems of traditional scraper transfer machines where the telescopic mechanism is highly concentrated at the machine head, leading to severe overloading of the machine head, easy sinking into the bottom plate and cutting the belt, and the difficulty in maintaining mechanical and hydraulic components due to the suspended arrangement.

[0006] To achieve the above objectives, this application provides the following technical solution: a distributed telescopic system for an easy-to-maintain scraper conveyor in a roadway, comprising a distributed telescopic assembly, wherein the distributed telescopic assembly comprises a plurality of telescopic ground section central troughs connected in series, and the plurality of telescopic ground section central troughs are arranged at the ground section of the scraper conveyor;

[0007] Each of the retractable landing sections includes a base, with a telescopic groove A slidably inserted on one side of the base and a telescopic groove B slidably inserted on the other side of the base. The base is provided with a telescopic drive device, and the two ends of the telescopic drive device are respectively connected to the telescopic groove A and the telescopic groove B.

[0008] Preferably, the telescopic drive device is a hydraulic cylinder disposed on both sides of the base, and the base has a closed interlayer receiving cavity on both sides, and the hydraulic cylinder is installed in the interlayer receiving cavity.

[0009] Preferably, the cylinder end of the hydraulic cylinder is hinged to the base, and the piston rod end of the hydraulic cylinder is hinged to the telescopic groove A and the telescopic groove B respectively.

[0010] Preferably, the expansion groove A and the expansion groove B are inserted into the base to form an overlapping structure, and the expansion groove A, the expansion groove B and the base slide and fit together at the overlapping structure.

[0011] Preferably, the overlapping structure specifically includes a bottom plate overlap, a middle plate overlap, a vertical plate overlap, an upper edge overlap, and a baffle overlap. The bottom plate overlap is located at the bottom of the middle groove of the retractable landing section. The middle plate overlap, the vertical plate overlap, the upper edge overlap, and the baffle overlap are arranged sequentially above the bottom plate overlap from bottom to top, and are all formed by the base and the corresponding parts of the telescopic groove A and the telescopic groove B horizontally overlapping and fitting together.

[0012] Preferably, the telescopic groove A and the telescopic groove B are respectively provided with a matching plug-in part at the end away from the base, and the middle grooves of two adjacent telescopic landing sections are connected by the plug-in part.

[0013] Preferably, it also includes a mechanical limiting component, which includes positioning pins. The base, the telescopic groove A, and the telescopic groove B are all provided with pin holes. A plurality of positioning pins are respectively inserted into the pin holes in which the base and the telescopic groove A cooperate, and into the pin holes in which the base and the telescopic groove B cooperate.

[0014] Preferably, the pin holes located on the expansion groove A and the pin holes located on the expansion groove B are arranged in four at intervals along the expansion direction, and the distance between adjacent pin holes is 25mm.

[0015] Preferably, a sliding guide structure is provided between the inner wall of the base and the outer walls of the expansion groove A and the expansion groove B. The sliding guide structure includes a slide rail formed on the inner side wall of the base, and sliders respectively protruding from the outer side walls of the expansion groove A and the expansion groove B and respectively inserted into the corresponding slide rails.

[0016] Preferably, one end of the distributed telescopic assembly is connected to the central groove of the ordinary landing section, and the other end of the distributed telescopic assembly is connected to the central groove of the unloading section.

[0017] This application provides a distributed telescopic system for an easy-to-maintain scraper transfer conveyor in a roadway. It offers the following advantages: 1. This application separates the telescopic function traditionally concentrated at the head of the machine and designs a decentralized telescopic system consisting of multiple telescopic landing sections connected in series in the middle. This allows the original telescopic head to be reduced in weight and transformed into a regular head without telescopic function. The structure of the groove at the head is simplified from a complex plug-in form to a single groove integrally welded, thereby solving the problems of equipment sinking, difficulty in moving the transfer machine, and damage to the conveyor belt caused by the excessive weight of the traditional head.

[0018] 2. This application transforms the traditional single-point, single-location dual-cylinder telescopic structure into a multi-point, decentralized telescopic structure composed of multiple independent telescopic landing sections with central grooves. Each unit achieves independent telescopic movement through the independent assembly of the base, telescopic groove A, telescopic groove B, and cylinders, effectively simplifying the overall telescopic structure, reducing the difficulty of processing and transporting parts, and improving manufacturing efficiency.

[0019] 3. This application replaces the traditional high-altitude arrangement above the tail of the belt conveyor by arranging the distributed telescopic system as a whole at the landing section of the scraper conveyor. This allows all maintenance operations such as daily maintenance and replacement of telescopic cylinders, adjustment of chain tension, and insertion and locking of positioning pins to be carried out on the ground, reducing the workload of on-site personnel in daily installation and maintenance and improving the safety of equipment maintenance. Attached Figure Description

[0020] Figure 1 A schematic diagram of the overall structural distribution of a traditional scraper conveyor used in a roadway. Figure 2 This is a three-dimensional schematic diagram showing the installation location and overall connection of the distributed telescopic assembly in the ground section of this application; Figure 3 This is a schematic diagram of the internal cross-sectional structure of the central groove of a single retractable landing section in this application; Figure 4 This is a three-dimensional schematic diagram of the central groove of the single retractable ground section of this application in its non-retractable state; Figure 5 This is a partially enlarged schematic diagram of the positioning pin in this application; Figure 6 This is a partial cross-sectional structural diagram highlighting the overlapping relationship of the vertical panels in the middle groove of the retractable landing section of this application; Figure 7This is a partial cross-sectional structural diagram of the central groove of the retractable landing section of this application, highlighting the overlapping relationship between the baffle, upper edge, middle plate and bottom plate.

[0021] 1. Distributed telescopic assembly; 2. Telescopic landing section central groove; 3. Ordinary landing section central groove; 4. Unloading section central groove; 5. Base; 6. Telescopic groove A; 7. Telescopic groove B; 8. Hydraulic cylinder; 9. Positioning pin; 10. Vertical plate overlap; 11. Baffle overlap; 12. Upper edge overlap; 13. Middle plate overlap; 14. Bottom plate overlap. Detailed Implementation

[0022] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0023] Reference Figures 1-7 A distributed telescopic system for an easy-to-maintain scraper conveyor in a roadway includes a distributed telescopic assembly 1, which includes multiple telescopic ground section central troughs 2 connected in series and arranged at the ground section of the scraper conveyor. Each retractable landing section includes a base 5 in the middle groove 2. A telescopic groove A6 is horizontally slidably inserted into one side of the base 5, and a telescopic groove B7 is horizontally slidably inserted into the other side of the base 5. A telescopic drive device is provided on the base 5, and the two ends of the telescopic drive device are connected to the telescopic groove A6 and the telescopic groove B7 respectively.

[0024] Specifically, the total weight of a traditional telescopic conveyor head, including the power unit, often reaches around 30 tons. Its load is entirely supported by the self-moving tail section of the conveyor belt below. When the floor of the underground roadway is soft, this can easily cause the entire equipment to sink, leading to coal slurry and gangue getting caught and damaging the conveyor belt. By separating the telescopic function and transferring it from the conveyor head to the landing section of the scraper conveyor, the conveyor head can adopt a single-chamber, integrally welded ordinary conveyor head structure. The weight of the single unit is significantly reduced to around 10 tons, eliminating the risk of equipment sinking caused by excessive weight. Simultaneously, the landing section adopts a modular series design, with each section... The maximum effective extension stroke of the retractable landing section middle groove 2 is set to 100mm. For example, in this embodiment, the initial total length of a single retractable landing section middle groove 2 in the unextended state is 2250mm. When it is driven to extend outward to reach the maximum stroke, its total length becomes 2350mm. In the actual layout of the mine, technicians can flexibly set the total adjustment range by increasing or decreasing the number of middle grooves. For example, by connecting 5 sets of these grooves in series, a whole machine extension adjustment range of 0 to 500mm can be established, which effectively reduces the types of non-standard parts and the manufacturing difficulty.

[0025] Reference Figures 5-6 The telescopic drive device is a hydraulic cylinder 8 set on both sides of the base 5. The base 5 has a closed interlayer receiving cavity on both sides, and the hydraulic cylinder 8 is installed in the interlayer receiving cavity.

[0026] Specifically, during the movement and operation of the underground transfer machine, large pieces of gangue often roll down and coal sludge accumulates around it. The hydraulic cylinder 8 and its associated hydraulic pipeline system are built into the specially designed enclosed sandwich cavities on both sides of the base 5. The external thick steel plate forms a physical isolation, which can prevent the external scattered materials from directly impacting the hydraulic components. At the same time, it can prevent debris from getting stuck in the extension and retraction gap of the hydraulic cylinder 8, ensuring the continuous and stable operation of the extension and retraction power unit in the harsh working environment.

[0027] Reference Figure 5 The cylinder end of the hydraulic cylinder 8 is hinged to the base 5, and the piston rod end of the hydraulic cylinder 8 is hinged to the telescopic groove A6 and the telescopic groove B7 respectively.

[0028] Specifically, in the operation logic of the middle section of the single-section telescopic landing section trough 2, the base 5, as a fixed base, supports the moving parts at both ends. When it is necessary to adjust the chain tension, the hydraulic system supplies pressure to the cylinder 8, and the cylinders 8 on both sides move synchronously. Through the piston rod, the linear thrust or pull force is applied to the force points of the telescopic trough A6 and telescopic trough B7. The hinged installation method provides the cylinder 8 with a certain degree of freedom for fine adjustment during operation, avoiding the rigid jamming phenomenon caused by manufacturing tolerances or stress deformation during long-distance sliding of the trough, and ensuring the smooth horizontal telescopic movement of the trough.

[0029] Reference Figure 3 The expansion grooves A6 and B7 are inserted into the base 5 to form an overlapping structure, and the expansion grooves A6 and B7 slide and fit with the base 5 at the overlapping structure.

[0030] Specifically, the inner ends of expansion joints A6 and B7 are both sleeve-type insertion structures, directly inserted horizontally into the main body of base 5, so that the three independent components form a single load-bearing unit after assembly. When the transfer machine moves laterally as the working face advances, the trough will inevitably bear bending stress in both horizontal and vertical directions. This overlapping structure can effectively distribute alternating loads and maintain the overall bending section modulus of the central trough under maximum tension without reduction.

[0031] Reference Figures 6-7The overlapping structure specifically includes a bottom plate overlap 14, a middle plate overlap 13, a vertical plate overlap 10, an upper edge overlap 12, and a baffle overlap 11. The bottom plate overlap 14 is located at the bottom of the middle groove 2 of the retractable landing section. The middle plate overlap 13, the vertical plate overlap 10, the upper edge overlap 12, and the baffle overlap 11 are arranged sequentially above the bottom plate overlap 14 from bottom to top, and are all formed by the horizontal overlap and bonding of the base 5 with the corresponding parts of the expansion groove A6 and expansion groove B7.

[0032] Specifically, the overlapping joints shown above—base plate overlap 14, middle plate overlap 13, vertical plate overlap 10, upper edge overlap 12, and baffle overlap 11—are essentially overlapping and fitting areas formed by the interlacing of the corresponding plates of the base 5 and the two side expansion grooves. By overlapping steel plates at five designated cross-sectional positions between the base 5 and the two side expansion grooves, the system constructs a continuous spatial closed contour internally. During the expansion or contraction of expansion grooves A6 and B7 along their horizontal stroke, the overlap allowance of the base plate overlap 14, middle plate overlap 13, vertical plate overlap 10, upper edge overlap 12, and baffle overlap 11 will change accordingly, but each overlapping part always maintains a physical fit. This full-section sliding sealing mechanism cuts off the gap path for materials inside the conveying trough to scatter outwards. Without adding additional flexible sealing components, it achieves the functions of preventing coal and gangue leakage during transportation by relying on the interlacing of purely mechanical plates.

[0033] Reference Figure 3 The telescopic grooves A6 and B7 are respectively provided with matching plug-in parts at the ends away from the base 5, and the middle grooves 2 of two adjacent telescopic landing sections are connected by plug-in parts.

[0034] Specifically, the physical interface of the middle section of the single-section retractable landing section adopts a standardized design. One end is a male connector with a protruding structure, and the other end is a female connector with a recessed structure. When assembling multiple sections of equipment on site, the protruding end of the previous section can be directly embedded into the recessed end of the next section to complete axial positioning and splicing. This eliminates the need for complex flange or bolt locking, and significantly shortens the equipment installation and disassembly cycle in the underground working face.

[0035] Reference Figure 3 It also includes a mechanical limiting component, which includes a positioning pin 9. The base 5, the telescopic groove A6 and the telescopic groove B7 are all provided with pin holes. Multiple positioning pins 9 are respectively inserted into the pin holes in which the base 5 and the telescopic groove A6 cooperate, and into the pin holes in which the base 5 and the telescopic groove B7 cooperate.

[0036] Specifically, after adjusting the scraper chain of the transfer machine to a reasonable tension using hydraulic cylinder 8, the operator inserts the positioning pin 9 from the outside into the pin hole currently aligned with the expansion slots on both sides of the base 5. After insertion, the entire equipment returns to a rigid connection state. The huge axial tensile and compressive loads generated by the subsequent start-up of the transfer machine and the impact of large pieces of material will be entirely borne by the shear surface formed by the high-strength positioning pin 9 and the wall of the slot hole. At this time, the operating valve group can be unloaded, allowing hydraulic cylinder 8 to be in a pressure-free resting state, completely eliminating internal leakage failure or cylinder fatigue fracture caused by long-term pulsating impact of the hydraulic system.

[0037] The pin holes on the expansion groove A6 and the pin holes on the expansion groove B7 are arranged at intervals along the expansion direction, with a spacing of 25mm between adjacent pin holes.

[0038] Specifically, based on the equidistant arrangement of the four pin holes, the central groove 2 of the single-section telescopic landing section is physically divided into four distinct telescopic adjustment positions, providing length compensation of 25mm, 50mm, 75mm and 100mm respectively. This equidistant hole design not only provides on-site maintenance personnel with an intuitive geometric reference scale when adjusting the chain tension, but also enables precise stroke distribution when multiple series grooves work together.

[0039] A sliding guide structure is provided between the inner wall of the base 5 and the outer walls of the expansion grooves A6 and B7. The sliding guide structure includes a slide rail opened on the inner side wall of the base 5, and sliders respectively protruding on the outer side walls of the expansion grooves A6 and B7 and respectively inserted into the corresponding slide rails.

[0040] Specifically, the slide rails on the inner wall of base 5 form the reference linear guide rails for the movement of the two telescopic troughs. During operation, when the equipment carries tens of tons of coal, the traction force of the scraper chain can easily cause the trough to float up and down or sway. The sliders inserted in the slide rails exert strong longitudinal displacement constraints on telescopic troughs A6 and B7, limiting vertical warping of the trough in the extended or retracted state, ensuring that the upper and lower overlapping plates are always within a smooth sliding trajectory, and preventing structural jamming or interference.

[0041] Reference Figure 1 One end of the distributed telescopic assembly 1 is connected to the central groove 3 of the ordinary landing section, and the other end of the distributed telescopic assembly 1 is connected to the central groove 4 of the unloading section.

[0042] Specifically, by arranging the entire distributed telescopic assembly 1 in series between the central trough 3 of the ordinary landing section and the central trough 4 of the unloading section, the system's working base is completely lowered to the level of the roadway floor. Compared to the traditional design where the telescopic head is suspended 2 to 3 meters above the tail of the conveyor belt, this structure allows maintenance personnel to operate directly with both feet on the ground. Whether observing the chain tension margin, inserting or removing the heavy positioning pin 9 while the machine is stopped, or disassembling and replacing the hydraulic cylinder 8, ample operating space and leverage points are provided, significantly reducing the physical exertion required for daily equipment maintenance and eliminating the safety risk of falls from heights.

[0043] Working Principle: When using this device, the distributed telescopic assembly 1 is integrally arranged in the landing section of the scraper conveyor. Its two ends are rigidly connected to the central trough 3 of the ordinary landing section and the central trough 4 of the unloading section, respectively. It is modularly connected in series by multiple telescopic central troughs 2 at their ends via plug-in joints. The central troughs 3, 4, and 2 are connected by tenon joints, with one end of the trough having a convex head and the other a concave head. Dumbbell pins are used to connect two sections of the central trough, which are then secured with locking blocks and spring pins. This allows for a flexible connection between adjacent central trough sections, bending vertically by 3° and horizontally by 1°. This ensures that adjacent central trough sections are connected in series and do not detach, while improving the adaptability of the central troughs to complex underground roadway changes.

[0044] During the telescopic operation, high-pressure oil enters the cylinders 8 in the closed interlayer cavities on both sides of the base 5. Utilizing the hinged relationship between the cylinder end and the piston rod end, the telescopic grooves A6 and B7, which are the moving parts, are driven to extend outward or retract inward relative to the base 5 in the horizontal direction. At this time, the sliders on the outer walls of the two telescopic grooves are correspondingly inserted into the slides on the inner walls of the base 5 to guide the sliding and limit the vertical warping of the grooves. Moreover, the two telescopic grooves and the base 5 always maintain sliding contact in the overlapping area formed by the bottom plate overlap 14, the middle plate overlap 13, the vertical plate overlap 10, the upper edge overlap 12, and the baffle overlap 11, forming a spatial overlap sealing closed loop to prevent coal and gangue from leaking outward. When moved to the desired position, the pin holes arranged at 25mm intervals on the two telescopic grooves are physically aligned with the fixing pin holes of the base 5. By inserting multiple positioning pins 9 into the matching pin holes on both sides, the groove and the base 5 are rigidly mechanically locked, and the pin bearings bear the axial thrust and impact load during subsequent operation.

Claims

1. A distributed telescopic system for an easy-to-maintain scraper conveyor in a roadway, comprising a distributed telescopic assembly (1), characterized in that, The distributed telescopic assembly (1) includes a plurality of telescopic ground section central grooves (2) connected in series, and the plurality of telescopic ground section central grooves (2) are arranged at the ground section of the scraper conveyor. Each of the retractable landing section central grooves (2) includes a base (5). A telescopic groove A (6) is horizontally slidably inserted into one side of the base (5), and a telescopic groove B (7) is horizontally slidably inserted into the other side of the base (5). The telescopic grooves A (6) and B (7) are inserted into the base (5) to form an overlapping structure. The telescopic grooves A (6) and B (7) slide against the base (5) at the overlapping structure. The overlapping structure specifically includes a bottom plate overlapping point (14), a middle plate overlapping point (13), a vertical plate overlapping point (10), an upper edge overlapping point (12), and a baffle overlapping point (11). The bottom plate overlapping point (14) is located in the central groove (2) of the retractable landing section. At the bottom, the middle plate overlap (13), the vertical plate overlap (10), the upper edge overlap (12), and the baffle overlap (11) are arranged sequentially from bottom to top above the bottom plate overlap (14), and are all formed by the horizontal overlap and bonding of the corresponding parts of the base (5) and the telescopic groove A (6) and the telescopic groove B (7). The base (5) is provided with a telescopic drive device, and the two ends of the telescopic drive device are respectively connected to the telescopic groove A (6) and the telescopic groove B (7). The telescopic drive device is a hydraulic cylinder (8) provided on both sides of the base (5). The base (5) is provided with a closed interlayer receiving cavity on both sides, and the hydraulic cylinder (8) is installed in the interlayer receiving cavity.

2. The distributed telescopic system for an easy-to-maintain scraper transfer machine in a roadway according to claim 1, characterized in that, The cylinder end of the oil cylinder (8) is hinged to the base (5), and the piston rod end of the oil cylinder (8) is hinged to the telescopic groove A (6) and the telescopic groove B (7) respectively.

3. The distributed telescopic system for an easy-to-maintain scraper transfer machine in a roadway according to claim 1, characterized in that, The telescopic groove A (6) and the telescopic groove B (7) are respectively provided with a matching plug-in part at the end away from the base (5), and the two adjacent telescopic landing sections are connected by the plug-in part.

4. The distributed telescopic system for an easy-to-maintain scraper transfer machine in a roadway according to claim 1, characterized in that, It also includes a mechanical limiting component, which includes a positioning pin (9). The base (5), the telescopic groove A (6) and the telescopic groove B (7) are all provided with pin holes. A plurality of positioning pins (9) are respectively inserted into the pin holes in the base (5) and the telescopic groove A (6) and the pin holes in the base (5) and the telescopic groove B (7).

5. The distributed telescopic system for an easy-to-maintain scraper transfer machine in a roadway according to claim 4, characterized in that, The pin holes located on the expansion groove A (6) and the pin holes located on the expansion groove B (7) are arranged in four intervals along the expansion direction, and the distance between adjacent pin holes is 25mm.

6. The distributed telescopic system for an easy-to-maintain scraper transfer machine in a roadway according to claim 1, characterized in that, A sliding guide structure is provided between the inner wall of the base (5) and the outer walls of the expansion groove A (6) and the expansion groove B (7). The sliding guide structure includes a slide rail opened on the inner side wall of the base (5) and a slider protruding from the outer side wall of the expansion groove A (6) and the expansion groove B (7) and inserted into the corresponding slide rail.

7. The distributed telescopic system for an easy-to-maintain scraper transfer machine in a roadway according to claim 1, characterized in that, One end of the distributed telescopic assembly (1) is connected to the central groove (3) of the ordinary landing section, and the other end of the distributed telescopic assembly (1) is connected to the central groove (4) of the unloading section.

Images