Follow-up protection device for oil cylinder of continuous mining machine and using method of follow-up protection device

Abstract

The invention belongs to the technical field of mining machines, and relates to a follow-up protection device for an oil cylinder of a continuous mining machine and a using method of the follow-up protection device. The cutting part of the continuous mining machine comprises a cutting arm, a lower oil cylinder, an upper oil cylinder and a rack; the lower oil cylinder is connected with the rack and the cutting arm; an oil cylinder lug is arranged at the upper part of the cutting arm; the upper oil cylinder comprises an upper oil cylinder piston rod and an upper oil cylinder barrel, the upper oil cylinder piston rod is connected with the oil cylinder lug seat through an upper oil cylinder front pin, and the upper oil cylinder barrel is connected with the upper part of the rack through an upper oil cylinder rear pin; the follow-up protection device comprises a connecting bent lug and a protection semicircular plate; the connecting bent lug is in clearance fit with the upper oil cylinder front pin; the connecting bent lug is connected with the protection semicircular plate; the arc-shaped inner surface of the protection semicircular plate is in lap joint with the outer circumferential face of the upper oil cylinder barrel and is in sliding connection with the outer circumferential face. According to the device, the piston rod is effectively prevented from being directly impacted by caved gravels, dust accumulation is prevented, the service life of the oil cylinder under severe working conditions is remarkably prolonged, and the reliability of the oil cylinder under severe working conditions is remarkably improved.

Description

Technical Field

[0001] This invention belongs to the field of mining machine technology, and relates to a follow-up protection device for the hydraulic cylinder of a continuous mining machine and its usage method. Background Technology

[0002] Continuous mining machines are mainly used for potash mining. The cutting section, as a key component of the machine, cuts the salt wall by swinging up and down. In existing technology, the up-and-down swing of the cutting section is mainly achieved by the extension and retraction of two lifting cylinders symmetrically arranged at its lower part. Because the cylinders are located at the lower part of the cutting section, the cut potash ore and floating dust are effectively blocked by the upper plane of the cutting section. The ore cannot hit the piston rod surface of the cylinder, and relatively little dust falls on the cylinder surface. Furthermore, the lifting cylinders effectively scrape off dust using dustproof rings arranged inside the cylinders during the extension and retraction movement, thus extending the service life of the cylinders.

[0003] However, the structure that uses only the lower cylinder to drive the cutting part has obvious defects: because the lever arm between the cylinder and the cutting part has a triangular structure, the lever arm is the longest and the torque is the greatest when the cylinder swings to the middle position, resulting in the greatest thrust on the cutting part, fast feed speed, and high cutting efficiency; while when cutting to the top and bottom positions, the lever arm is shorter and the torque is smaller, resulting in less thrust on the cutting part, slow feed speed, and low cutting efficiency.

[0004] To address the uneven cutting efficiency caused by the aforementioned lever arm variation, existing continuous mining machines employ a four-cylinder arrangement in the cutting section. Two sets of cylinders are located at the lower part of the cutting section, while the other two sets are located at the upper part. By fully utilizing the combined push-pull force effect of the four sets of cylinders, the cutting force variation during the top-to-bottom cutting process is minimized, resulting in a larger and more balanced thrust on the cutting section, thus effectively improving cutting efficiency. However, this new structure introduces new technical challenges: the cylinders located at the upper part of the cutting section lack any protective measures and are directly exposed to dust and falling debris. The cylinder piston rods are easily dented by the debris, leading to oil leakage and damage, or long-term coverage by large amounts of potassium salt dust can cause corrosion and pitting, resulting in leakage. Due to the limitation of cutting height, directly adding a protective canopy to the upper lifting cylinders would affect the minimum cutting height and the overall machine's maneuverability. Summary of the Invention

[0005] To address the problems in the prior art, this invention provides a follow-up protection device for the hydraulic cylinder of a continuous mining machine and its usage method, which effectively blocks the direct impact of falling rocks on the piston rod and prevents dust accumulation, significantly improving the service life and reliability of the hydraulic cylinder under harsh working conditions.

[0006] To achieve the above objectives, the present invention employs the following technical solution: In a first aspect, the present invention provides a follow-up protection device for the cutting section of a continuous mining machine, the cutting section of the continuous mining machine including a cutting arm, a lower hydraulic cylinder, an upper hydraulic cylinder, and a frame; the lower hydraulic cylinder is connected to the frame via a lower hydraulic cylinder rear pin and to the cutting arm via a lower hydraulic cylinder front pin; the upper part of the cutting arm is provided with a hydraulic cylinder lug seat; the upper hydraulic cylinder includes an upper hydraulic cylinder piston rod and an upper hydraulic cylinder barrel, the upper hydraulic cylinder piston rod is connected to the hydraulic cylinder lug seat via an upper hydraulic cylinder front pin, and the upper hydraulic cylinder barrel is connected to the upper part of the frame via an upper hydraulic cylinder rear pin; The follow-up protection device includes a connecting lug and a protective semicircular plate; the connecting lug is clearance-fitted with the front pin of the upper cylinder; the connecting lug is connected to the protective semicircular plate; the arc-shaped inner surface of the protective semicircular plate overlaps the outer circumferential surface of the upper cylinder barrel and is slidably connected to the outer circumferential surface.

[0007] Preferably, the connecting lug is connected to the welding block by connecting bolts, and the welding block is connected to the protective semicircular plate.

[0008] Preferably, the connecting lug is a bent plate structure; one end of the connecting lug is fitted onto the front pin of the upper cylinder, and the other end of the connecting lug is fixedly connected to the welding block by the connecting bolt.

[0009] Preferably, the welding block is welded and fixed to the top of the outer arc surface of the protective semicircular plate, and the welding block is provided with a threaded hole that mates with the connecting bolt.

[0010] Preferably, a wear-resistant rubber pad is provided on the inner side of the tail end of the protective semi-circular plate, and the wear-resistant rubber pad abuts against the outer circumferential surface of the upper oil cylinder barrel.

[0011] Preferably, the wear-resistant rubber pad has an arc-shaped strip structure; the wear-resistant rubber pad is bonded and fixed to the inner arc surface of the tail end of the protective semi-circular plate, and the inner arc surface of the wear-resistant rubber pad slides and fits against the outer circumferential surface of the upper cylinder barrel.

[0012] Preferably, the protective semicircular plate is provided with the anti-detachment bolt; the anti-detachment bolt is located at the end of the protective semicircular plate away from the connecting lug; the end of the anti-detachment bolt extends to the vicinity of the outer circumferential surface of the upper cylinder barrel.

[0013] Preferably, the protective semicircular plate has a radially penetrating bolt hole at the end away from the connecting elbow, the anti-loosening bolt is installed in the bolt hole, and the end of the anti-loosening bolt is clearance-fitted with the outer circumferential surface of the upper cylinder barrel.

[0014] Preferably, the protective semicircular plate is a semicircular arc-shaped plate structure; the arc length of the protective semicircular plate is greater than half the circumference of the outer circumference of the upper cylinder barrel, and the length of the protective semicircular plate is less than the length of the upper cylinder barrel.

[0015] A second objective of this invention is to provide a method of using a follow-up protection device for the cutting section of a continuous mining machine, comprising the following steps: When the continuous mining machine performs cutting operations, the piston rod of the upper cylinder extends and retracts relative to the cylinder barrel, while the cutting arm swings up and down around the main pin. The extension and retraction of the piston rod of the upper cylinder drives the connecting lug to move synchronously through the front pin of the upper cylinder, thereby causing the protective semicircular plate, which is fixedly connected to the connecting lug, to slide axially along the outer circumferential surface of the cylinder barrel. At the same time, the swinging of the cutting arm drives the connecting lug to rotate around the front pin of the upper cylinder through the cylinder lug seat and the front pin of the upper cylinder, so that the protective semicircular plate always maintains a concentric posture with the cylinder barrel of the upper cylinder. Throughout the entire process of the extension and retraction of the upper cylinder piston rod and the swinging of the cutting arm, the protective semicircular plate always covers the outer circumference of the upper cylinder barrel, preventing the falling gravel and flying dust during the cutting process from directly impacting or covering the upper cylinder piston rod.

[0016] Compared with the prior art, the present invention has the following beneficial effects: By using a clearance fit between the connecting elbow and the front pin of the upper cylinder, the protective device can share the same rotating pin shaft with the piston rod of the upper cylinder and the cutting arm. This allows for coaxial rotation without increasing the installation space, ensuring that the protective semicircular plate remains aligned with the cylinder during the swing of the cutting arm. The fixed connection between the connecting elbow and the protective semicircular plate allows the plate to move axially synchronously with the extension and retraction of the piston rod, achieving a dynamic adjustment of the protection range according to the cylinder's operating state. Furthermore, by overlapping the arc-shaped inner surfaces of the protective semicircular plate... The protective semicircular plate is slidably connected to the outer circumference of the upper cylinder barrel, forming an arc-shaped protective barrier covering the cylinder barrel. This effectively blocks the direct impact of falling debris on the piston rod and prevents dust from accumulating on the piston rod surface. At the same time, the sliding connection ensures that the protective device remains in contact with the cylinder barrel during the extension and retraction of the piston rod, preventing interference with the normal operation of the cylinder. Ultimately, this achieves full-stroke dynamic protection for the piston rod of the upper cylinder within a limited space, significantly improving the service life and reliability of the cylinder under harsh cutting conditions. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram illustrating the application of the follow-up protection device of the present invention; Figure 2 This is a front view of the follow-up protection device of the present invention; Figure 3 This is a top view of the follow-up protection device of the present invention; Figure 4 This is a side view of the follow-up protection device of the present invention.

[0019] The components include: 1. Cutting arm; 2. Oil pipe guard plate; 3. Cylinder lug seat; 4. Lower cylinder front pin; 5. Upper cylinder pin baffle; 6. Upper cylinder front pin; 7. Baffle bolt; 8. Connecting elbow; 9. Connecting bolt; 10. Upper cylinder piston rod; 11. Welding block; 12. Protective semi-circular plate; 13. Wear-resistant rubber pad; 14. Anti-loosening bolt; 15. Upper cylinder barrel; 16. Upper cylinder rear pin; 17. Lower cylinder; 18. Lower cylinder rear pin; 19. Main pin; 20. Frame. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0026] The present invention will now be described in further detail with reference to the accompanying drawings: The first objective of this invention is to provide a follow-up protection device for the cutting section of a continuous mining machine, such as... Figures 1-4 As shown, the cutting section of the continuous mining machine includes a cutting arm 1, a lower hydraulic cylinder 17, an upper hydraulic cylinder, and a frame 20. The lower hydraulic cylinder 17 is connected to the frame 20 via a lower hydraulic cylinder rear pin 18 and to the cutting arm 1 via a lower hydraulic cylinder front pin 4, thereby providing lower thrust to the cutting arm 1. The upper part of the cutting arm 1 is provided with a hydraulic cylinder lug 3. The upper hydraulic cylinder includes an upper hydraulic cylinder piston rod 10 and an upper hydraulic cylinder barrel 15. The upper hydraulic cylinder piston rod 10 is connected to the hydraulic cylinder lug 3 via an upper hydraulic cylinder front pin 6, and the upper hydraulic cylinder barrel 15 is connected to the upper part of the frame 20 via an upper hydraulic cylinder rear pin 16, thus forming a hydraulic cylinder arrangement system for coordinated pushing and pulling. The follow-up protection device includes a connecting lug 8 and a protective semicircular plate 12; the connecting lug 8 is clearance-fitted with the front pin 6 of the upper cylinder, thereby forming a coaxial rotational connection with the pin; the connecting lug 8 is connected to the protective semicircular plate 12; the arc-shaped inner surface of the protective semicircular plate 12 overlaps the outer circumferential surface of the upper cylinder barrel 15 and is slidably connected to the outer circumferential surface, so that it can slide axially along the outer circumferential surface, realizing the follow-up protection function of moving synchronously with the extension and retraction of the cylinder.

[0027] This follow-up protection device fully utilizes the front pin 6 of the upper cylinder as a common rotating shaft, achieving effective protection for the piston rod 10 and cylinder barrel 15 of the upper cylinder exposed to dust and gravel without increasing additional installation space. Its arc-shaped plate structure can not only block falling ore from damaging the surface of the piston rod 10 of the upper cylinder from all directions, but also ensure that the protection device remains in contact with the cylinder barrel 15 during the extension, retraction and swing of the cylinder through a sliding connection. At the same time, the wear-resistant rubber pad 13 set on the inner wall of the protective semi-circular plate 12 can effectively reduce the damage to the surface of the cylinder barrel 15 caused by sliding friction.

[0028] In addition, the cutting arm 1 is also equipped with an oil pipe guard plate 2 to protect the hydraulic pipeline from direct impact from external gravel or dust; the end of the upper cylinder front pin 6 is equipped with an upper cylinder pin baffle 5, which is fixedly connected to the cylinder ear seat 3 by baffle bolts 7, to axially limit the upper cylinder front pin 6 and prevent it from loosening or falling out during operation.

[0029] For example, the connecting lug 8 is detachably fixed to the welding block 11 via connecting bolts 9, and the welding block 11 is firmly welded to the protective semicircular plate 12. This connection method fully considers the assembly reliability and maintenance convenience under harsh working conditions of mining machinery. Using the welding block 11 as an intermediate transition connector effectively disperses the connection stress between the connecting lug 8 and the protective semicircular plate 12, preventing thermal deformation or strength reduction of the connecting lug 8 due to direct welding, which would affect its fitting accuracy with the upper cylinder front pin 6. Simultaneously, the use of connecting bolts 9 for fixing not only ensures the stability of the connection structure under strong vibration but also allows the protective semicircular plate 12 to be replaced separately without disassembling the cylinder and connecting lug 8 if it becomes worn or damaged after long-term use, significantly reducing maintenance costs and time.

[0030] For example, the connecting lug 8 is a bent plate structure; one end of the connecting lug 8 is fitted onto the front pin 6 of the upper cylinder, and the other end of the connecting lug 8 is fixedly connected to the welding block 11 by the connecting bolt 9.

[0031] This invention satisfies the spatial requirements of pin connection and bolt fixing simultaneously through a single bent component. It not only makes full use of the upper cylinder front pin 6 as a common rotating shaft to achieve follow-up function, but also effectively solves the installation problem caused by the limited space between the two ends of the pin and the cylinder lug 3 on the cutting arm 1 and the inconsistent length on both sides. This allows the same connecting lug 8 to be adapted to the symmetrical installation requirements of the two cylinders by simple directional adjustment, greatly improving the versatility and utilization of the parts. At the same time, one end of the connecting lug 8 is fitted with the upper cylinder front pin 6, which can ensure that the protective device always rotates in the center with the upper cylinder barrel 15 during the up and down swing of the cutting arm 1. The other end is rigidly connected to the welding block 11 through the connecting bolt 9, which ensures a stable connection with the protective semicircular plate 12. This integral bent plate design reduces the number of parts and improves the fatigue resistance of the structure under strong vibration conditions. At the same time, the protective semicircular plate 12 can be quickly replaced by simply operating the connecting bolt 9 during disassembly and assembly, without disassembling the upper cylinder front pin 6 and related cylinder components.

[0032] For example, the welding block 11 is welded and fixed to the top of the outer arc surface of the protective semicircular plate 12, which avoids the sliding contact area between the inner side of the protective semicircular plate 12 and the upper cylinder barrel 15, and also ensures that the connection point is located on the direct path of force transmission, thereby ensuring that the tension or thrust transmitted from the connecting lug 8 can be evenly applied to the overall structure of the protective semicircular plate 12; at the same time, the welding block 11 is provided with a threaded hole that mates with the connecting bolt 9. This threaded connection method not only realizes the detachable fixation between the welding block 11 and the connecting lug 8, but also utilizes the self-locking characteristics of the thread to maintain the connection stability under strong vibration conditions, and avoids the protective device from detaching from the cylinder due to bolt loosening.

[0033] For example, a wear-resistant rubber pad 13 is provided on the inner side of the tail end of the protective semicircular plate 12. The wear-resistant rubber pad 13 abuts against the outer circumferential surface of the upper cylinder barrel 15, thereby forming a flexible contact between the protective semicircular plate 12 and the upper cylinder barrel 15. This design is because the protective semicircular plate 12 needs to slide back and forth on the surface of the upper cylinder barrel 15 with the extension and retraction of the piston rod 10 of the upper cylinder. If direct metal-to-metal contact is used, not only will the chromium plating layer or base material on the outer surface of the upper cylinder barrel 15 be easily worn due to sliding friction, but the normal extension and retraction of the cylinder may also be affected by excessive frictional resistance, and even metal dust may be generated to pollute the downhole environment. By providing a wear-resistant rubber pad 13 on the inner side of the tail end of the protective semicircular plate 12, the low coefficient of friction and good elasticity of polymer materials such as rubber or polyurethane are utilized to effectively reduce the sliding resistance, allowing the protective semicircular plate 12 to smoothly extend and retract with the cylinder. On the one hand, the rubber pad material has a certain degree of hardness and wear resistance, which can withstand reciprocating friction for a long time without being easily damaged. At the same time, its flexible properties can absorb the vibration generated during the cutting process and prevent the impact force generated by rigid contact from being transmitted to the surface of the cylinder. In addition, the tight contact between the wear-resistant rubber pad 13 and the outer circumference of the upper cylinder barrel 15 also forms a sealing lip-like effect, which can scrape off the dust particles attached to the surface of the upper cylinder barrel 15 during the sliding of the protective semi-circular plate 12, preventing dust from entering the gap between the protective semi-circular plate 12 and the upper cylinder barrel 15, thereby further reducing the risk of abrasive wear and extending the service life of the cylinder.

[0034] For example, the wear-resistant rubber pad 13 is an arc-shaped strip structure; the wear-resistant rubber pad 13 is bonded and fixed to the inner arc surface of the tail end of the protective semi-circular plate 12, and the inner arc surface of the wear-resistant rubber pad 13 slides against the outer peripheral surface of the upper cylinder barrel 15. This arc-shaped strip structure design perfectly matches the cylindrical geometric characteristics of the upper cylinder barrel 15, which can maximize the contact area between the wear-resistant rubber pad 13 and the upper cylinder barrel 15, so that the pressure is evenly distributed during the sliding process, avoiding premature wear or detachment of the rubber pad due to local stress concentration; at the same time, by placing the wear-resistant rubber pad 13 only at the tail end of the protective semi-circular plate 12 rather than the entire inner arc surface, it not only meets the functional requirements of sliding guidance and dust scraping, but also reduces the amount of rubber pad material used and the sliding friction resistance, making the protective semi-circular plate The movement of the 12 is more convenient and flexible when it extends and retracts with the hydraulic cylinder. The adhesive fixing method not only ensures a tight fit between the rubber pad and the protective semicircular plate 12, avoiding relative displacement or edge curling and falling off during reciprocating motion, but also, compared with the mechanical fixing method, the surface of the adhesive structure is flat and without protrusions, and there is no additional risk of scratching the surface of the upper hydraulic cylinder barrel 15. When the wear-resistant rubber pad 13 wears after long-term use, it can be simply peeled off from the protective semicircular plate 12 and a new rubber pad can be re-adheded to restore its performance. The maintenance process is simple and quick.

[0035] For example, the protective semicircular plate 12 is provided with the anti-loosening bolt 14; the anti-loosening bolt 14 is located at the end of the protective semicircular plate 12 away from the connecting lug 8; the end of the anti-loosening bolt 14 extends to the vicinity of the outer peripheral surface of the upper cylinder barrel 15.

[0036] Ideally, the protective semicircular plate 12, through the coaxial connection between the connecting lug 8 and the front pin 6 of the upper cylinder, and the sliding contact between the wear-resistant rubber pad 13 and the cylinder barrel 15 of the upper cylinder, can achieve a smooth follow-up protection function. However, when the equipment encounters severe vibration or accidental impact, the protective semicircular plate 12 may still rotate and pop out around the front pin 6 of the upper cylinder due to inertial force and vibration, causing the protection function to fail and posing a certain safety hazard. The function of the anti-loosening bolt 14 is that its end extends to the vicinity of the outer circumference of the cylinder barrel 15 to form a physical block. When the protective semicircular plate 12 rotates around the front pin 6 of the upper cylinder, the anti-loosening bolt 14 will interfere with the maximum diameter of the circular surface of the cylinder barrel 15, thereby preventing the tail of the protective semicircular plate 12 from continuing to rotate out and ensuring that it always remains within the effective protection range.

[0037] For example, the protective semicircular plate 12 has a radially penetrating bolt hole at one end away from the connecting elbow 8, and the anti-loosening bolt 14 is installed in the bolt hole. The end of the anti-loosening bolt 14 is clearance-fitted with the outer peripheral surface of the upper cylinder barrel 15 and the lower surface exceeding the maximum diameter.

[0038] This radially penetrating bolt hole design not only facilitates the installation and fixing of the anti-loosening bolt 14, but also enables the bolt to remain stable under strong vibration conditions due to the self-locking characteristic of the thread after tightening, preventing the limit function from failing due to loosening. In addition, during normal telescopic sliding, the anti-loosening bolt 14 does not contact the surface of the upper cylinder barrel 15, and no frictional resistance or wear is generated, ensuring the smooth movement of the protective semicircular plate 12 with the piston rod 10 of the upper cylinder. When the protective semicircular plate 12 tends to rotate due to accidental impact or severe vibration, the end of the anti-loosening bolt 14 will quickly interfere with the maximum diameter circle of the upper cylinder barrel 15, thereby effectively preventing the tail of the protective semicircular plate 12 from continuing to rotate out, playing a reliable mechanical safety role.

[0039] For example, the protective semicircular plate 12 is a semicircular arc-shaped plate structure; the arc length of the protective semicircular plate 12 is greater than half of the circumference of the outer peripheral surface of the upper cylinder barrel 15, and the length of the protective semicircular plate 12 is less than the length of the upper cylinder barrel 15.

[0040] On the one hand, the arc length of the protective semicircular plate 12 is greater than half the circumference of the upper cylinder barrel 15, which means that it can cover the upper cylinder barrel 15 by more than 180 degrees. This design, which is not completely closed but can cover the upper hemisphere, ensures that the ore and dust falling from above cannot directly contact the exposed part of the upper cylinder barrel 15 and the upper cylinder piston rod 10. It also avoids the installation difficulties and poor heat dissipation problems that may be caused by complete annular coverage. At the same time, the coverage angle of more than half a circle can make the protective semicircular plate 12 stably fasten to the upper cylinder barrel 15 by its own arc structure. Even if it is subjected to lateral impact, it is not easy to deflect or fall off. On the other hand, the length of the protective semicircular plate 12 is less than the length of the upper cylinder barrel 15. This design fully considers the limit position requirements of the cylinder's extension and retraction movement. When the upper cylinder piston rod 10 is fully extended, the protective semicircular plate 12 needs to move forward to protect the exposed surface of the upper cylinder piston rod 10. When the upper cylinder piston rod 10 is fully retracted, the protective semicircular plate 12 must avoid interference with the cylinder lug 3 or other structures at the rear end of the upper cylinder barrel 15. This is achieved by controlling the length of the protective semicircular plate 12 to be less than the length of the upper cylinder barrel 15. The design ensures that the protective semicircular plate 12 can still cover the front part of the upper cylinder barrel 15 when the upper cylinder piston rod 10 is extended to its limit position, providing protection for the root of the upper cylinder piston rod 10. It also ensures that the tail end of the protective semicircular plate 12 will not hit the fixed structure at the rear end of the upper cylinder barrel 15 when the upper cylinder piston rod 10 is fully retracted. This dimensional optimization allows the protective semicircular plate 12 to remain within the effective working area throughout the entire extension and retraction stroke of the cylinder, achieving maximum protective coverage while ensuring a safe clearance during movement.

[0041] For example, the axial projection of the protective semicircular plate 12 completely covers the exposed portion of the upper cylinder piston rod 10. This ensures that regardless of whether the upper cylinder is extended, retracted, or in any intermediate position, when viewed from a direction parallel to the cylinder axis, the arc-shaped body of the protective semicircular plate 12 can always completely shield the exposed surface of the upper cylinder piston rod 10 within its shadow area. This means that when ore, rocks, and dust falling from above the cutting section fall under the influence of gravity, they will first impact the outer arc surface of the protective semicircular plate 12 and be effectively blocked, preventing them from directly contacting the surface of the upper cylinder piston rod 10. This fundamentally eliminates the possibility of the upper cylinder piston rod 10 being damaged or contaminated. In other words, no matter how the cutting arm 1 swings or how the cylinder extends or retracts, the upper cylinder piston rod 10 is always reliably shielded within the arc-shaped embrace of the protective semicircular plate 12, thereby significantly reducing the risk of external damage to the hydraulic system and significantly extending the service life and reliability of the upper cylinder.

[0042] A second objective of this invention is to provide a method of using a follow-up protection device for the cutting section of a continuous mining machine, comprising the following steps: When the continuous mining machine performs cutting operations, the piston rod 10 of the upper cylinder extends and retracts relative to the cylinder barrel 15 of the upper cylinder, while the cutting arm 1 swings up and down around the main pin 19. The extension and retraction of the piston rod 10 of the upper cylinder drives the connecting lug 8 to move synchronously through the front pin 6 of the upper cylinder, thereby causing the protective semicircular plate 12, which is fixedly connected to the connecting lug 8, to slide axially along the outer circumferential surface of the cylinder barrel 15 of the upper cylinder. At the same time, the swinging of the cutting arm 1 drives the connecting lug 8 to rotate around the front pin 6 of the upper cylinder through the cylinder lug seat 3 and the front pin 6 of the upper cylinder, so that the protective semicircular plate 12 always maintains a concentric posture with the cylinder barrel 15 of the upper cylinder. Throughout the entire process of the extension and retraction of the upper cylinder piston rod 10 and the swinging of the cutting arm 1, the protective semi-circular plate 12 always covers the outer circumferential surface of the upper cylinder barrel 15, preventing the falling gravel and flying dust during the cutting process from directly impacting or covering the upper cylinder piston rod 10.

[0043] Specifically, when the continuous mining machine is performing cutting operations, the piston rod 10 of the upper cylinder reciprocates and extends relative to the cylinder barrel 15 according to the lifting and lowering needs of the cutting arm 1. At the same time, the cutting arm 1 swings up and down around the main pin 19 to adjust the cutting height. During this process, the extension and retraction of the piston rod 10 drives the connecting lug 8, which is mounted on the pin, to move axially in sync through the upper cylinder front pin 6, which is fixedly connected to it. This causes the protective semicircular plate 12, which is fixedly connected to the connecting lug 8, to slide smoothly axially along the outer circumferential surface of the cylinder barrel 15. Meanwhile, the swinging motion of the cutting arm 1 drives the connecting lug 8 to rotate around the upper cylinder front pin 6 through the cylinder lug seat 3 and the upper cylinder front pin 6. This ensures that the protective semicircular plate 12 remains concentric with the cylinder barrel 15 during the swinging motion of the cutting arm 1, thus ensuring that the fit between the inner arc surface of the protective semicircular plate 12 and the outer circumferential surface of the cylinder barrel 15 is not disrupted due to angle changes.

[0044] Throughout the entire process of the extension and retraction of the upper cylinder piston rod 10 and the swing of the cutting arm 1, the axial projection of the protective semicircular plate 12 always completely covers the exposed part of the upper cylinder piston rod 10, and its arc-shaped structure covers the upper cylinder barrel 15. Therefore, it can effectively prevent the falling gravel from directly impacting the surface of the upper cylinder piston rod 10 during the cutting process, and at the same time prevent the accumulation of a large amount of flying potassium salt dust on the upper cylinder piston rod 10 and the front end area of ​​the upper cylinder barrel 15. This fundamentally eliminates the risk of hydraulic oil leakage caused by damage to the surface of the upper cylinder piston rod 10 due to external force or dust corrosion.

[0045] The method of using the follow-up protection device of this invention ingeniously links the movement of the protective semicircular plate 12 with the movement of the upper hydraulic cylinder and the cutting arm 1 through a shared rotating pin. This allows the protection device to automatically adapt to the combined movements of the hydraulic cylinder extension and retraction and the cutting arm 1 swing without the need for an additional power source. This ensures reliable protection under all working conditions and avoids any changes to the original equipment operation. Operators can obtain a continuous and stable protective effect without additional operation or adjustment. In addition, the flexible contact of the wear-resistant rubber pad 13 effectively prevents wear on the surface of the upper hydraulic cylinder barrel 15 during the sliding of the protective semicircular plate 12, while the anti-loosening bolt 14 provides reliable safety under vibration conditions. This ensures the stability and reliability of this method in long-term harsh working environments, ultimately achieving the technical effect of significantly extending the service life of the upper hydraulic cylinder while ensuring efficient cutting operations of the continuous mining machine.

[0046] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A follow-up protection device for a continuous miner cutting assembly, characterized in that, The continuous mining machine cutting section includes a cutting arm (1), a lower hydraulic cylinder (17), an upper hydraulic cylinder, and a frame (20); the lower hydraulic cylinder (17) is connected to the frame (20) via a lower hydraulic cylinder rear pin (18) and to the cutting arm (1) via a lower hydraulic cylinder front pin (4); the upper part of the cutting arm (1) is provided with a hydraulic cylinder lug seat (3); the upper hydraulic cylinder includes an upper hydraulic cylinder piston rod (10) and an upper hydraulic cylinder barrel (15), the upper hydraulic cylinder piston rod (10) is connected to the hydraulic cylinder lug seat (3) via an upper hydraulic cylinder front pin (6), and the upper hydraulic cylinder barrel (15) is connected to the upper part of the frame (20) via an upper hydraulic cylinder rear pin (16); The follow-up protection device includes a connecting lug (8) and a protective semicircular plate (12); the connecting lug (8) is clearance-fitted with the front pin (6) of the upper cylinder; the connecting lug (8) is connected to the protective semicircular plate (12); the arc-shaped inner surface of the protective semicircular plate (12) overlaps the outer circumferential surface of the upper cylinder barrel (15) and is slidably connected to the outer circumferential surface.

2. A follow-up protection device for a continuous miner cutting assembly as set forth in claim 1, characterized in that, The connecting lug (8) is connected to the welding block (11) by the connecting bolt (9), and the welding block (11) is connected to the protective semicircular plate (12).

3. A follow-up protection device for a continuous miner cutting assembly as set forth in claim 2, characterized in that, The connecting lug (8) is a bent plate structure; one end of the connecting lug (8) is fitted onto the front pin (6) of the upper cylinder, and the other end of the connecting lug (8) is fixedly connected to the welding block (11) by the connecting bolt (9).

4. A follow-up protection device for the cutting section of a continuous mining machine according to claim 3, characterized in that, The welding block (11) is welded and fixed to the top of the outer arc surface of the protective semicircular plate (12), and the welding block (11) is provided with a threaded hole that mates with the connecting bolt (9).

5. A follow-up protection device for the cutting section of a continuous mining machine according to claim 1, characterized in that, The inner side of the tail end of the protective semicircular plate (12) is provided with a wear-resistant rubber pad (13), which abuts against the outer circumferential surface of the upper oil cylinder barrel (15).

6. A follow-up protection device for the cutting section of a continuous mining machine according to claim 5, characterized in that, The wear-resistant rubber pad (13) has an arc-shaped strip structure; the wear-resistant rubber pad (13) is bonded and fixed to the inner arc surface of the tail end of the protective semi-circular plate (12), and the inner arc surface of the wear-resistant rubber pad (13) slides and fits against the outer circumferential surface of the upper oil cylinder barrel (15).

7. A follow-up protection device for the cutting section of a continuous mining machine according to claim 1, characterized in that, The protective semicircular plate (12) is provided with the anti-detachment bolt (14); the anti-detachment bolt (14) is located at the end of the protective semicircular plate (12) away from the connecting lug (8); the end of the anti-detachment bolt (14) extends to the vicinity of the outer circumference of the upper cylinder barrel (15).

8. A follow-up protection device for the cutting section of a continuous mining machine according to claim 7, characterized in that, The protective semicircular plate (12) has a radially penetrating bolt hole at one end away from the connecting bend (8). The anti-detachment bolt (14) is installed in the bolt hole, and the end of the anti-detachment bolt (14) is clearance-fitted with the outer circumferential surface of the upper cylinder barrel (15).

9. A follow-up protection device for the cutting section of a continuous mining machine according to claim 1, characterized in that, The protective semicircular plate (12) is a semicircular arc plate structure; the arc length of the protective semicircular plate (12) is greater than half the circumference of the outer circumference of the upper cylinder barrel (15), and the length of the protective semicircular plate (12) is less than the length of the upper cylinder barrel (15).

10. A method of using a follow-up protection device for the cutting section of a continuous mining machine according to any one of claims 1 to 9, characterized in that, Includes the following steps: When the continuous mining machine performs cutting operations, the piston rod (10) of the upper cylinder moves in extension and retraction relative to the cylinder barrel (15), while the cutting arm (1) swings up and down around the main pin (19). The extension and retraction of the piston rod (10) of the upper cylinder drives the connecting lug (8) to move synchronously through the front pin (6) of the upper cylinder, thereby driving the protective semicircular plate (12) fixedly connected to the connecting lug (8) to slide axially along the outer circumferential surface of the cylinder barrel (15). At the same time, the swing of the cutting arm (1) drives the connecting lug (8) to rotate around the front pin (6) of the upper cylinder through the cylinder lug seat (3) and the front pin (6), so that the protective semicircular plate (12) always maintains a concentric posture with the cylinder barrel (15). Throughout the entire process of the extension and retraction of the upper cylinder piston rod (10) and the swing of the cutting arm (1), the protective semicircular plate (12) always covers the outer circumferential surface of the upper cylinder barrel (15), preventing the falling gravel and flying dust during the cutting process from directly impacting or covering the upper cylinder piston rod (10).

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