Self-moving tail skid outer-embedded expansion device
By embedding a sliding plate on the bottom of the sliding shoe, the contact area between the sliding shoe and the tunnel floor is expanded, solving the problem of the sliding shoe sinking when the floor is not hard enough, thus achieving stable movement of the sliding shoe and efficient operation of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG XIN MINE ZHAOGUAN ENERGY CO LTD
- Filing Date
- 2025-08-15
- Publication Date
- 2026-06-05
Smart Images
Figure CN224324608U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of self-moving tail auxiliary equipment, specifically relating to an externally embedded extension device for a self-moving tail skid. Background Technology
[0002] In fully mechanized coal mining faces, self-propelled tail conveyors are a key component of scraper conveyors or belt conveyors, and their sliding shoes are the core parts that enable stable movement and load-bearing of the tail. The sliding shoes are in direct contact with the roadway floor and not only need to support the overall weight of the tail but also work with a pushing mechanism under hydraulic drive to move the tail forward. Their structural rationality and performance stability directly affect the advancing efficiency of the coal mining face, equipment lifespan, and operational safety, and are the foundation for ensuring that self-propelled tail conveyors can adapt to complex underground environments and achieve continuous and efficient operation.
[0003] Currently, the sliding shoe structure and working method of existing self-moving tail sections have formed a relatively fixed pattern. As shown in the patent with publication number CN111960057A, the sliding shoes of a self-moving tail section are usually fixedly connected to the bottom of the H-frame on both sides of the tail base and at the connection of the longitudinal beams, and the sliding shoes are fastened to the tail structure through connecting plates. During operation, the sliding shoes serve as the contact support points between the tail and the base plate. Under the coordinated action of hydraulic components such as the pushing cylinder and the support cylinder, they work with the tail base and longitudinal beams to complete a reciprocating stepping motion. First, the support base is fixed by the support structure, and then the pushing cylinder pushes the tail body forward. The sliding shoes slide along the base plate to achieve position transfer, and finally complete the self-moving process of the tail.
[0004] However, in practical applications, due to the fixed specifications of the slipper, its contact area cannot be flexibly adjusted according to the working conditions. When encountering a working environment where the base plate is not hard enough, the pressure per unit area of the slipper will increase significantly, and it is very easy to sink into the base plate. This will directly lead to a sharp increase in the resistance of the tail movement, and in severe cases, even jamming will occur, greatly reducing the working efficiency. Utility Model Content
[0005] This invention addresses the problem that slippers easily sink into the roadway floor when the floor slab is not hard enough. It provides an externally embedded extension device for a self-moving tail slipper, which can effectively increase the contact area between the slipper and the roadway floor slab, thereby preventing the slipper from sinking into the floor slab.
[0006] To solve the above problems, the technical solution adopted by this utility model is an externally embedded extension device for a self-moving tail skid, including a connecting plate. The top surface of the connecting plate is provided with a connecting groove, the shape of which is adapted to the bottom contour of the skid. Several limiting blocks are fixed on the bottom surface of the connecting plate. A sliding plate is provided below the connecting plate, the bottom surface of which is larger than the bottom surface of the skid. Several limiting grooves are provided on the top surface of the sliding plate, the limiting grooves and the limiting blocks are positioned opposite each other, and the limiting blocks can be embedded in the limiting grooves. A locking mechanism is provided on the sliding plate, which can lock the connecting plate on the sliding plate.
[0007] In this technical solution, the top surface of the connecting plate is provided with a connecting groove that matches the contour of the bottom of the sliding shoe, while the bottom surface is fixed with several limiting blocks. The bottom surface area of the sliding plate below it is larger than that of the bottom surface of the sliding shoe, and the top surface is also provided with several limiting grooves corresponding to the positions of the limiting blocks. The sliding plate is equipped with a locking mechanism to lock the connecting plate onto it. In practical use, the bottom of the sliding shoe is first installed in the connecting groove of the connecting plate, and the two are fixedly connected by welding. Then, a suitable sliding plate is selected according to the actual working conditions, the limiting blocks on the connecting plate are embedded into the limiting grooves of the sliding plate, and the locking mechanism is used to lock them in place, thereby expanding the sliding shoe. Therefore, this device can effectively increase the contact area between the sliding shoe and the tunnel floor, thus preventing the sliding shoe from sinking into the floor.
[0008] Furthermore, there are four limiting blocks arranged in a rectangular array, forming a symmetrical layout of two rows and two columns. From a structural stability perspective, the symmetrical distribution of the rectangular array allows the limiting blocks to provide more balanced support and restraint for the connecting plate, preventing localized wear or deformation caused by concentrated force. The four limiting blocks constrain the connecting plate from different directions, effectively limiting its horizontal translation or rotation, ensuring precise and stable relative positioning between the connecting plate and the sliding plate. This is especially beneficial during sliding or load-bearing processes, reducing displacement deviations caused by swaying. The symmetrical layout also improves installation convenience. Due to the symmetrical position, there is no need to consciously distinguish directions during installation, reducing the possibility of installation errors and facilitating disassembly and repositioning for later maintenance. In addition, this layout provides more rational force transmission. When the slipper bears a load, the force can be evenly distributed through the connecting plate to the four limiting blocks before being transmitted to the sliding plate, preventing damage to individual limiting blocks due to overload and extending the overall structural lifespan.
[0009] Furthermore, the limiting block is rectangular in shape, with a chamfered bottom. This chamfer serves as a guide during installation. When the limiting block aligns with the limiting groove, the chamfer reduces friction and collisions, allowing the limiting block to fit more smoothly into the groove. This prevents jamming or damage caused by minor installation deviations. Especially in scenarios requiring rapid assembly or frequent disassembly, this design significantly improves ease of operation and extends the component's lifespan. In addition, the chamfer eliminates sharp edges on the bottom of the limiting block, reducing the risk of component damage or personal injury from impacts during use.
[0010] Furthermore, there are four limiting grooves, each corresponding to a limiting block, and the inner contour of the limiting groove and the outer contour of the limiting block are interference-fitted. This interference fit allows the limiting block and the limiting groove to engage tightly, directly bearing the radial force generated during sliding. This effectively limits the relative radial displacement between the connecting plate and the sliding plate, preventing misalignment or wobbling under stress and ensuring the overall stability of the structure. Since the radial force is borne by the interference fit between the limiting block and the limiting groove, the function of the locking mechanism can be precisely simplified, focusing only on fixing the axial position of the connecting plate and the sliding plate, without having to bear radial shear force. This not only reduces the design load of the locking mechanism and the risk of wear or failure due to complex stress, but also extends its service life. Simultaneously, it makes the force distribution of each component clearer and more reasonable, improving the reliability and durability of the entire device.
[0011] Furthermore, rocker arms are fixed to both sides of the sliding plate along its edges perpendicular to the direction of movement of the sliding shoe. The side of the rocker arm away from the sliding plate is tilted upwards, and the bottom surface of the rocker arm forms a 30° angle with the bottom surface of the sliding plate. The upward tilting rocker arms can act as a path opener and guide when the sliding shoe moves the sliding plate. When the sliding plate travels along the tunnel floor, if it encounters protrusions, gravel, or uneven areas on the floor surface, the tilting angle of the rocker arms can lift the obstacles upwards or guide them to the sides, reducing the jamming and bumping caused by the sliding plate directly colliding with the obstacles, reducing the resistance to movement, and protecting the sliding plate and its bottom structure from impact damage. Especially in complex tunnel environments, this design can significantly improve the smoothness of movement.
[0012] Furthermore, guard plates are installed on both sides of the sliding plate along the direction of the sliding shoe's movement. These guard plates are vertically arranged, with their bottom surfaces fixedly connected to the top surface of the sliding plate. The two sides of each guard plate are fixedly connected to the rocker arms on either side. From a structural strength perspective, the fixed connections between the guard plates, the sliding plate, and the rocker arms form a closed frame structure, integrating the planar portion of the sliding plate with the rocker arms on both sides, significantly improving the overall rigidity and deformation resistance of the sliding plate. When the sliding shoe moves the sliding plate or bears a load, this integrated frame can more evenly distribute stress, preventing the edges of the sliding plate from bending or warping due to excessive localized stress. It also enhances the stability of the connection between the rocker arms and the sliding plate, preventing the rocker arms from detaching or deforming due to stress when contacting obstacles. From a protective perspective, the vertically arranged guard plates form lateral barriers along the sliding shoe's movement direction, preventing gravel, soil, or other debris from the roadway floor from entering the gap between the sliding plate and the connecting plate. This avoids these impurities interfering with the engagement of the limiting block and the limiting groove, or affecting the normal operation of the locking mechanism, thus ensuring the stability and reliability of the connection between the sliding plate and the connecting plate. Furthermore, the guard plates also provide lateral protection for the welded areas at the bottom of the connecting plate and the sliding shoe, reducing damage to critical connection structures from lateral collisions during movement.
[0013] Furthermore, the sliding plate is equipped with several stiffening plates. One edge of each stiffening plate is fixedly connected to the top surface of the rocker, and the other edge is fixedly connected to the top surface of the sliding plate. These stiffening plates connect the top surfaces of the rocker and the sliding plate, effectively forming an oblique support between them, which can effectively resist deformation of the rocker caused by stress. When the rocker comes into contact with an obstacle or bears lateral force during movement, the force is transferred to the main body of the sliding plate through the stiffening plates, reducing the risk of bending or breaking at the root of the rocker due to stress concentration. Simultaneously, the stiffening plates also enhance the rigidity of the top surface of the sliding plate, preventing it from denting due to localized pressure during load-bearing or movement. The sliding plate, rocker, and stiffening plates form a triangular support structure. When the device bears a vertical load or the rocker is subjected to an impact load, the stiffening plates can efficiently transmit the force from the rocker to the sliding plate, and then distribute it throughout the structure to the load-bearing components such as the sliding shoe, avoiding damage to components caused by excessive localized stress and resulting in a more balanced load distribution throughout the entire structure. Previously, the guard plate had connected the sliding plate and rocker plate into a lateral frame, while the stiffening plate further reinforced the connection between the two from the top, making the rocker plate, sliding plate, guard plate, and stiffening plate form a three-dimensional integral structure. This multi-dimensional connection method allows the components to work together to bear the load when subjected to force, reducing the decrease in overall structural stability caused by loosening or failure of a single connection point. Especially under complex working conditions, it can significantly improve the durability and reliability of the device.
[0014] Furthermore, the connecting plate is provided with several connecting holes distributed around the connecting groove. The locking mechanism includes several vertically arranged screws, which are positioned opposite to the connecting holes. The bottom of the screws is fixedly connected to the top surface of the sliding plate, and the top of the screws can pass through the corresponding connecting holes and be fixedly connected to the locking nut. The connecting holes distributed around the connecting groove, in conjunction with the corresponding screws, form a multi-point uniform force-bearing locking structure. Compared to single-point fixing, this multi-point distribution can disperse the axial locking force of the connecting plate and the sliding plate to multiple locations, avoiding deformation or loosening caused by local stress concentration, and ensuring the overall rigidity of the connection between the two.
[0015] As can be seen from the above embodiments, the beneficial effects of this utility model are as follows: In this technical solution, the top surface of the connecting plate is provided with a connecting groove that matches the contour of the bottom of the sliding shoe, and several limiting blocks are fixed on the bottom surface; the sliding plate is located below the connecting plate, its bottom surface area is larger than the bottom surface of the sliding shoe, its top surface is provided with a limiting groove corresponding to the position of the limiting block, and it is equipped with a locking mechanism. In use, the bottom of the sliding shoe is first installed in the connecting groove of the connecting plate, and the two are fixed by welding; then, a matching sliding plate is selected according to the actual working conditions, the limiting block of the connecting plate is embedded in the limiting groove of the sliding plate, and the locking mechanism is used to complete the locking, thereby realizing the expansion of the sliding shoe. In summary, this device increases the contact area with the tunnel floor by fixing an externally embedded sliding plate to the bottom of the sliding shoe, effectively preventing the sliding shoe from sinking into the floor. Attached Figure Description
[0016] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a structural schematic diagram of a specific embodiment of the present utility model;
[0018] Figure 2 This is a schematic diagram of the connecting plate in a specific embodiment of the present invention. Figure 1 ;
[0019] Figure 3 This is a schematic diagram of the connecting plate in a specific embodiment of the present invention. Figure 2 ;
[0020] Figure 4 This is a schematic diagram of the sliding plate in a specific embodiment of the present invention.
[0021] In the diagram: 1. Connecting plate; 11. Connecting groove; 12. Limiting block; 13. Chamfer; 14. Connecting hole; 2. Sliding plate; 21. Limiting groove; 3. Locking mechanism; 31. Screw; 32. Locking nut; 4. Rocker; 5. Guard plate; 6. Rib plate. Detailed Implementation
[0022] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.
[0023] An external extension device for a self-moving tail skid, such as Figure 1 As shown, the system includes a connecting plate 1, the top of which can be welded to the bottom of the sliding shoe. A sliding plate 2 is provided below the connecting plate 1, the bottom surface of which is larger than the bottom surface of the sliding shoe. A locking mechanism 3 is provided on the sliding plate 2, which can lock the connecting plate 1 onto the sliding plate 2, so that the sliding shoe contacts the tunnel floor through the sliding plate 2. Since the bottom surface of the sliding plate 2 is larger than the bottom surface of the sliding shoe, the contact area between the sliding shoe and the tunnel floor is indirectly increased, thereby preventing the sliding shoe from sinking into the tunnel floor.
[0024] like Figure 2-3 As shown, in this specific embodiment, the connecting plate 1 is generally rectangular, and its top surface is provided with a connecting groove 11. The shape of the connecting groove 11 is adapted to the contour of the bottom of the sliding shoe, and the bottom of the sliding shoe can be installed in the connecting groove 11. Several limiting blocks 12 are fixed on the bottom surface of the connecting plate 1, and the limiting blocks 12 are all integrally processed with the connecting plate 1. In this embodiment, there are four limiting blocks 12, which are distributed in a rectangular array to form a symmetrical layout of two rows and two columns. The limiting blocks 12 are rectangular and have chamfered corners 13 at the bottom.
[0025] The connecting plate 1 is provided with several through-holes 14, which are distributed around the connecting groove 11, and the center line of the connecting holes 14 is vertical.
[0026] like Figure 4As shown, in this specific embodiment, the sliding plate 2 is also generally rectangular and located below the connecting plate 1. Its size can be selected according to actual needs. The top surface of the sliding plate 2 is provided with several limiting grooves 21, which are positioned opposite to several limiting blocks 12. The limiting blocks 12 can be embedded within the limiting grooves 21. In this embodiment, there are four limiting grooves 21, each opposite to one of the four limiting blocks 12, and the inner contour of the limiting groove 21 matches the outer contour of the limiting block 12. When the limiting block 12 is installed in the limiting groove 21, the inner contour of the limiting groove 21 and the outer contour of the limiting block 12 are in an interference fit.
[0027] Both sides of the sliding plate 2, perpendicular to the direction of movement of the sliding shoe, are fixed with rocker arms 4. Both rocker arms 4 are integrally machined with the sliding plate 2, and the connection is rounded. The side of the rocker arm 4 away from the sliding plate 2 is tilted upward, and its bottom surface forms a 30° angle with the bottom surface of the sliding plate 2.
[0028] The sliding plate 2 is equipped with guard plates 5 on both sides along the direction of movement of the sliding shoe. The guard plates 5 are arranged vertically, and their bottom surfaces are welded to the top surface of the sliding plate 2. The two sides of the guard plates 5 are welded to the rocker plates 4 on both sides respectively. Several stiffening plates 6 are provided on the sliding plate 2. One edge of the stiffening plate 6 is welded to the top surface of the rocker plate 4, and the other edge is welded to the top surface of the sliding plate 2.
[0029] In this specific embodiment, the locking mechanism 3 includes several vertically arranged screws 31, which are positioned opposite to several connecting holes 14, meaning the number and size of the screws 31 are adapted to the connecting holes 14. The bottom of each screw 31 is welded to the top surface of the sliding plate 2, and the top can pass through the corresponding connecting hole 14 and be fixedly connected to the locking nut 32. Each screw 31 is equipped with two locking nuts 32, forming a double-nut anti-loosening structure to ensure a stable connection.
[0030] The process is as follows: the connecting plate 1 is fitted onto the bottom of the slipper, so that the bottom of the slipper is completely embedded in the connecting groove 11 on the top surface of the connecting plate 1, ensuring that the outer contour of the bottom of the slipper fits tightly with the inner contour of the connecting groove 11; then, full welding is performed along the contact gap between the connecting groove 11 and the bottom of the slipper to fix the connecting plate 1 and the slipper into an integral structure. After welding, the weld is ground to avoid any protrusions or burrs.
[0031] Based on the actual load-bearing requirements of the tunnel floor and the stress conditions of the sliding shoe, a sliding plate 2 of suitable size is selected. The sliding plate 2 is placed stably under the connecting plate 1, so that the limiting groove 21 on the top surface of the sliding plate 2 is aligned with the limiting block 12 on the bottom surface of the connecting plate 1. Then, a hammer is used to evenly hammer along the top surface of the connecting plate 1, so that the limiting block 12 is gradually embedded into the corresponding limiting groove 21 until the limiting block 12 is completely stuck into the bottom of the groove. At this time, the limiting block 12 and the limiting groove 21 form an interference fit, realizing the initial positioning of the connecting plate 1 and the sliding plate 2.
[0032] After the limiting engagement is completed, several screws 31 on the top surface of the sliding plate 2 will pass through the corresponding connecting holes 14 on the connecting plate 1, with the top of the screws 31 extending a certain length out of the connecting holes 14. Two locking nuts 32 are screwed into the protruding ends of each screw 31 in sequence. First, the lower nut is screwed until it is flush with the top surface of the connecting plate 1 and tightened to the specified torque with a wrench; then the upper nut is screwed until it is tightly flush with the lower nut and tightened with a wrench as well. The mutual locking of the two nuts forms an anti-loosening structure, ultimately ensuring a stable connection between the connecting plate 1 and the sliding plate 2 without relative displacement.
[0033] As can be seen from the above embodiments, the beneficial effects of this utility model are as follows: In this specific embodiment, the top surface of the connecting plate is provided with a connecting groove that matches the contour of the bottom of the sliding shoe, and several limiting blocks are fixed on the bottom surface; the sliding plate is located below the connecting plate, its bottom surface area is larger than the bottom surface of the sliding shoe, its top surface is provided with a limiting groove corresponding to the position of the limiting block, and it is equipped with a locking mechanism. In use, the bottom of the sliding shoe is first installed in the connecting groove of the connecting plate, and the two are fixed by welding; then, a matching sliding plate is selected according to the actual working conditions, the limiting block of the connecting plate is embedded in the limiting groove of the sliding plate, and the locking mechanism is used to complete the locking, thereby realizing the expansion of the sliding shoe. In summary, this device increases the contact area with the tunnel floor by fixing an externally embedded sliding plate to the bottom of the sliding shoe, effectively preventing the sliding shoe from sinking into the floor.
[0034] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. An externally mounted extension device for a self-propelled tail skid, comprising a connecting plate (1), characterized in that, The top surface of the connecting plate (1) is provided with a connecting groove (11), the shape of which is adapted to the bottom contour of the sliding shoe. Several limiting blocks (12) are fixed on the bottom surface of the connecting plate (1). A sliding plate (2) is provided below the connecting plate (1). The bottom surface of the sliding plate (2) is larger than the bottom surface of the sliding shoe. Several limiting grooves (21) are provided on the top surface of the sliding plate (2). The limiting grooves (21) and the limiting blocks (12) are positioned opposite each other. The limiting blocks (12) can be embedded in the limiting grooves (21). A locking mechanism (3) is provided on the sliding plate (2). The locking mechanism (3) can lock the connecting plate (1) on the sliding plate (2).
2. The externally mounted extension device for a self-propelled tail skid as described in claim 1, characterized in that, There are four limit blocks (12), which are arranged in a rectangular array to form a symmetrical layout of two rows and two columns.
3. The externally mounted extension device for a self-moving tail skid as described in claim 2, characterized in that, The limiting block (12) is rectangular, and the bottom of the limiting block (12) is chamfered (13).
4. The externally mounted extension device for a self-propelled tail skid as described in claim 2, characterized in that, There are four limiting grooves (21). The four limiting grooves (21) are respectively opposite to the four limiting blocks (12), and the inner contour of the limiting groove (21) and the outer contour of the limiting block (12) can be interference fit.
5. The externally mounted extension device for a self-propelled tail skid according to claim 1, characterized in that, The sliding plate (2) has rocker (4) fixed on both sides of the edge perpendicular to the direction of movement of the sliding shoe. The rocker (4) is tilted upward on the side away from the sliding plate (2), and the bottom surface of the rocker (4) forms a 30° angle with the bottom surface of the sliding plate (2).
6. The externally mounted extension device for a self-propelled tail skid according to claim 5, characterized in that, The sliding plate (2) is provided with guard plates (5) on both sides along the direction of the sliding shoe movement. The guard plates (5) are arranged vertically. The bottom surface of the guard plate (5) is fixedly connected to the top surface of the sliding plate (2). The two sides of the guard plate (5) are fixedly connected to the rocker plates (4) on both sides respectively.
7. The externally mounted extension device for a self-propelled tail skid according to claim 6, characterized in that, Several stiffeners (6) are provided on the sliding plate (2). One side edge of the stiffener (6) is fixedly connected to the top surface of the rocker (4), and the other side edge of the stiffener (6) is fixedly connected to the top surface of the sliding plate (2).
8. The externally mounted extension device for a self-propelled tail skid according to claim 1, characterized in that, The connecting plate (1) is provided with several connecting holes (14), which are distributed around the connecting groove (11). The locking mechanism (3) includes several vertically arranged screws (31), which are positioned opposite to the connecting holes (14). The bottom of the screws (31) is fixedly connected to the top surface of the sliding plate (2), and the top of the screws (31) can pass through the corresponding connecting holes (14) and be fixedly connected to the locking nut (32).