Bridge crane buffer structure

Abstract

The utility model relates to a buffer, in particular to a buffer structure of a bridge crane, which comprises a base, a damping cylinder arranged on the base and a piston rod inserted on the damping cylinder in a sliding manner, and a damping structure is arranged at one end, positioned in the damping cylinder, of the piston rod. The damping structure comprises a piston which is arranged on the piston rod and slides on the inner wall of the damping cylinder. Core components of the damper mainly comprise the piston, the damping cylinder, the rotating disc and the inserting rod, the piston is installed in the damping cylinder and can freely slide in the damping cylinder, the rotatable rotating disc is arranged in a cavity of the piston, and the inserting rod is responsible for driving the rotating disc to rotate in the cavity of the piston. A plurality of first arc-shaped holes and second arc-shaped holes are formed in the piston and the rotating disc respectively, the actual size of the damping holes is directly determined by the overlapping area of the first arc-shaped holes and the second arc-shaped holes, then the flowing speed of hydraulic oil or other damping media is affected, and finally the damping force is adjusted.

Description

Technical Field

[0001] This utility model relates to a buffer, specifically a buffer structure for a bridge crane. Background Technology

[0002] A bridge crane buffer is a key safety device used on bridge cranes. Its main function is to absorb impact energy during crane operation, especially when the trolley or main trolley is approaching the end of its stroke, and to reduce the inertial impact of moving parts, thereby preventing damage to the crane structure and equipment due to violent collisions, while also reducing the impact on operators and the surrounding environment.

[0003] Current buffers generally include mechanical buffers (including but not limited to spring buffers and hydraulic buffers) and elastic material buffers (including but not limited to rubber buffers and polyurethane buffers). In practical applications, elastic material buffers often have some limitations in large bridge cranes. For example, although rubber buffers and polyurethane buffers have the advantages of simple structure and low cost, their buffering effect is often not ideal when facing the strong impact force generated by large bridge cranes. Because these elastic material buffers are prone to deformation or damage when subjected to high-energy impacts, their service life is relatively short, making it difficult to meet the requirements of long-term stable operation of large bridge cranes.

[0004] Given these shortcomings of elastic material buffers, large bridge cranes typically prioritize mechanical buffers. Mechanical buffers, especially hydraulic and spring buffers, are widely used because they provide more stable and reliable cushioning. Although mechanical buffers have significant advantages in large bridge cranes, they also face some challenges in actual use. For example, when the bridge crane approaches the end of its stroke at a high speed or with a large load, the resulting impact force may exceed the buffer's design range. In this case, if the buffer's support is insufficient, it may bottom out, meaning the piston rod is completely compressed to the bottom of the damping cylinder, thus losing its cushioning function. On the other hand, if the buffer's damping is set too strong, it may cause a rigid impact between the buffer and the bridge crane, failing to effectively absorb the impact energy and thus failing to provide the intended cushioning effect. Utility Model Content

[0005] The purpose of this utility model is to provide a buffer structure for a bridge crane to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A bridge crane buffer structure includes a base, a damping cylinder disposed on the base, and a piston rod slidably inserted into the damping cylinder. One end of the piston rod located inside the damping cylinder is provided with a damping structure, the damping structure comprising:

[0008] A piston is mounted on the piston rod and slides on the inner wall of the damping cylinder, and a sealing mechanism is rotatably installed in the piston cavity.

[0009] The plug rod is connected to the blocking mechanism and has one end disposed in the cavity of the damping cylinder. When the piston slides into the damping cylinder, the blocking mechanism rotates in the cavity of the piston under the control of the plug rod, thereby realizing real-time adjustment of the damping force to adapt to the buffering requirements under different load and impact conditions.

[0010] As described above, a bridge crane buffer structure has an oil seal at the top center of the damping cylinder, which slides against the piston rod to prevent hydraulic oil leakage inside the damping cylinder.

[0011] A bridge crane buffer structure as described above: a top seat is installed on the top of the piston rod, and a spring is sleeved on the piston rod;

[0012] One end of the spring abuts against the top seat, and the other end abuts against the oil seal. During the buffering process, the spring plays a role in resetting and pre-tightening the piston rod.

[0013] As described above, a bridge crane buffer structure has a plurality of first arc-shaped holes arranged in a ring array on the piston.

[0014] A bridge crane buffer structure as described above: the blocking mechanism includes a rotating disk that rotates within the piston cavity, a plurality of second arc-shaped holes arranged in a ring array on the rotating disk, and ball bearings disposed on the inner wall of the central slot of the rotating disk.

[0015] The second arc-shaped hole corresponds to and cooperates with the first arc-shaped hole to adjust and control the size of the damping hole. By changing the overlapping area of ​​the first arc-shaped hole and the second arc-shaped hole, the damping force can be adjusted.

[0016] A bridge crane buffer structure as described above: the plug rod is provided with a bolt groove and a vertical groove, and the bolt groove and the vertical groove are connected.

[0017] The bolt groove and vertical groove abut against the ball bearing to control the rotation angle of the rotating disk, thereby achieving dynamic adjustment of the damping orifice size.

[0018] A bridge crane buffer structure as described above: a folding retractable cover is provided on the piston rod between the damping cylinder and the top seat;

[0019] One end of the folding shrink cover is connected to the damping cylinder, and the other end is connected to the top seat. The folding shrink cover is used to prevent dust and impurities from entering the damping system.

[0020] A bridge crane buffer structure as described above: the top of the top seat is provided with a rubber layer for reducing rigid contact with the bridge crane.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] The core components of this buffer mainly include a piston, a damping cylinder, a rotating disk, and a connecting rod. The piston is installed inside the damping cylinder and can slide freely within it. A rotatable rotating disk is installed inside the piston cavity, and the connecting rod is responsible for driving the rotating disk to rotate within the piston cavity. Several first arc-shaped holes and second arc-shaped holes are respectively opened on the piston and the rotating disk. The overlapping area of ​​the two directly determines the actual size of the damping holes, which in turn affects the flow rate of hydraulic oil or other damping media, ultimately achieving the adjustment of the damping force.

[0023] The area of ​​the damping orifice is designed to be maximized initially, resulting in a relatively small damping force. This design allows the crane to make contact with the buffer in a smoother manner, effectively avoiding rigid collisions caused by excessive initial damping force. This protects the structural integrity of the crane and the buffer and reduces the risk of equipment damage.

[0024] As the bridge crane continues to apply thrust to the buffer, the rotating disk gradually rotates under the action of the plug rod. This rotation process causes the overlapping area of ​​the first arc-shaped hole and the second arc-shaped hole to gradually decrease, which in turn causes the area of ​​the damping hole to gradually shrink. The shrinkage of the damping hole area means that the flow of hydraulic oil is more restricted, which in turn causes the damping force to gradually increase. This dynamic adjustment mechanism can adjust the damping force in real time according to the magnitude of the thrust applied by the bridge crane.

[0025] It effectively avoids two common buffering problems: when the thrust applied by the bridge crane is small, the buffer will not cause the piston rod to bottom out due to insufficient support, thus losing its buffering function; while when the thrust applied by the bridge crane is large, the buffer will not cause rigid contact with the crane due to excessive damping force, thus playing an effective buffering role. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a bridge crane buffer.

[0027] Figure 2 This is a schematic diagram of the structure of a bridge crane buffer without the folded retractable cover.

[0028] Figure 3 This is a schematic diagram of the base and damping cylinder in the buffer structure of a bridge crane.

[0029] Figure 4 This is a schematic diagram of the overall cross-section of the buffer structure of a bridge crane.

[0030] Figure 5 This is a cross-sectional schematic diagram of the base and damping cylinder in the buffer structure of a bridge crane.

[0031] Figure 6 This is a partially enlarged schematic diagram of the buffer structure of a bridge crane.

[0032] Figure 7 This is a schematic diagram of the piston rod and piston in the buffer structure of a bridge crane.

[0033] Figure 8 This is a schematic diagram of the rotating disk and the connecting rod in the buffer structure of a bridge crane.

[0034] Figure 9 This is a schematic diagram of the rotating disk in the buffer structure of a bridge crane.

[0035] Figure 10 This is a cross-sectional schematic diagram of the piston rod and piston in the buffer structure of a bridge crane.

[0036] Figure 11 This is a schematic diagram of the folded retractable cover in the buffer structure of a bridge crane.

[0037] In the diagram: 1. Base; 2. Damping cylinder; 3. Oil seal; 4. Piston rod; 5. Top seat; 6. Spring; 7. Piston; 8. First arc-shaped hole; 9. Rotary disk; 10. Second arc-shaped hole; 11. Connecting rod; 12. Bolt groove; 13. Vertical groove; 14. Ball bearing; 15. Folding and shrinking cover. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0039] Please see Figures 1-4 In this embodiment of the present invention, a bridge crane buffer structure includes a base 1, a damping cylinder 2 disposed on the base 1, and a piston rod 4 slidably inserted into the damping cylinder 2. One end of the piston rod 4 located inside the damping cylinder 2 is provided with a damping structure, the damping structure comprising:

[0040] A piston 7 is mounted on the piston rod 4 and slides on the inner wall of the damping cylinder 2. A sealing mechanism is rotatably installed in the cavity of the piston 7.

[0041] The plug rod 11 is connected to the sealing mechanism and one end is located in the cavity of the damping cylinder 2. When the piston 7 is slidably inserted into the damping cylinder 2, the sealing mechanism rotates in the cavity of the piston 7 under the control of the plug rod 11, so as to realize the real-time adjustment of the damping force to adapt to the buffering requirements under different load and impact conditions.

[0042] In this embodiment, when the bridge crane applies a thrust to the piston rod 4, the piston rod 4 will slide into the damping cylinder 2 under the action of the thrust. Since the piston rod 4 and the piston 7 are fixedly connected, the sliding of the piston rod 4 will drive the piston 7 to slide synchronously in the damping cylinder 2. The damping cylinder 2 is filled with hydraulic oil, which plays a key damping role in the buffering process. When the piston 7 slides in the damping cylinder 2, the hydraulic oil will generate a pressure difference on both sides of the piston 7, thereby generating a damping force and playing a buffering role.

[0043] However, the unique feature of this buffer is that it can dynamically adjust the damping force according to different impact conditions. A sealing mechanism is set inside the piston 7, which is connected to the plug rod 11 fixed inside the damping cylinder 2. When the piston 7 slides inside the damping cylinder 2, the plug rod 11 will drive the sealing mechanism to rotate inside the piston 7. This rotation will change the relative position between the sealing mechanism and the piston 7, thereby adjusting the flow path and flow rate of the hydraulic oil, and thus controlling the magnitude of the damping force.

[0044] Please see Figure 3 and Figure 5 As a further embodiment of this utility model, an oil seal 3 is provided at the top center of the damping cylinder 2. The oil seal 3 is slidably fitted with the piston rod 4 to prevent hydraulic oil leakage inside the damping cylinder 2.

[0045] In this embodiment, in order to ensure the efficient operation and reliability of the buffer, an oil seal 3 is specially provided at the top center of the damping cylinder 2. This oil seal 3 fits tightly with the piston rod 4 and can maintain good sealing performance as the piston rod 4 slides. The main function of the oil seal 3 is to prevent the hydraulic oil inside the damping cylinder 2 from leaking.

[0046] Please see Figure 2 , Figure 4 and Figure 6 As a further embodiment of this utility model, a top seat 5 is installed on the top of the piston rod 4, and a spring 6 is sleeved on the piston rod 4;

[0047] One end of the spring 6 abuts against the top seat 5, and the other end abuts against the oil seal 3. During the buffering process, the spring 6 plays the role of resetting and pre-tightening the piston rod 4.

[0048] The top of the top seat 5 is provided with a rubber layer to reduce rigid contact with the bridge crane.

[0049] In this embodiment, a top seat 5 is mounted on the top of the piston rod 4, and a spring 6 is sleeved on the piston rod 4. One end of the spring 6 is in close contact with the top seat 5, and the other end is in contact with the oil seal 3. This structural design allows the spring 6 to play an important role in the buffering process: on the one hand, the spring 6 can provide a restoring force to the piston rod 4, ensuring that the piston rod 4 can smoothly return to its initial position after the buffering action is completed, preparing for the next buffering; on the other hand, the spring 6 also plays a pre-tightening role. By applying a certain pre-tightening force, the initial support capacity of the buffer is enhanced, so that the buffer can respond more stably when facing impacts of different intensities, thereby improving the buffering effect and reliability.

[0050] In addition, a rubber layer is specially provided on the top of the top seat 5. The main function of this rubber layer is to reduce the rigid contact between the buffer and the bridge crane. In actual operation, the bridge crane may come into contact with the buffer with a large impact force. Without proper buffering measures, such rigid contact may cause damage to the buffer or the crane structure. The rubber layer can effectively absorb and disperse the impact energy, reduce the damage caused by rigid collision, and also reduce the noise generated by the collision, providing additional protection for the smooth operation of the bridge crane.

[0051] Please see Figures 6-9 As a further embodiment of this utility model, the piston 7 is provided with a plurality of first arc-shaped holes 8 arranged in an annular array.

[0052] The sealing mechanism includes a rotating disk 9 that rotates within the cavity of the piston 7, a plurality of second arc-shaped holes 10 arranged in a ring array on the rotating disk 9, and ball bearings 14 disposed on the inner wall of the central slot of the rotating disk 9.

[0053] The second arc-shaped hole 10 and the first arc-shaped hole 8 are used to adjust and control the size of the damping hole. By changing the overlapping area of ​​the first arc-shaped hole 8 and the second arc-shaped hole 10, the damping force can be adjusted.

[0054] The plug rod 11 is provided with a bolt groove 12 and a vertical groove 13, and the bolt groove 12 and the vertical groove 13 are connected.

[0055] The bolt groove 12 and vertical groove 13 abut against the ball 14 to control the rotation angle of the rotating disk 9, thereby realizing dynamic adjustment of the size of the damping hole.

[0056] In this embodiment, the piston 7 is provided with a plurality of first arc-shaped holes 8, which are distributed in a ring array. The sealing mechanism includes a rotating disk 9, which is rotatably installed in the cavity of the piston 7. The rotating disk 9 is also provided with a plurality of second arc-shaped holes 10 in a ring array, and a ball bearing 14 is fixed on the inner wall of the central slot of the rotating disk 9. The key to this design is that the second arc-shaped holes 10 and the first arc-shaped holes 8 correspond to each other and cooperate with each other. By changing their overlapping area, the actual size of the damping hole can be adjusted in combination, thereby achieving precise control of the damping force.

[0057] In order to achieve precise control of the rotation angle of the rotating disk 9, the plug rod 11 is specially provided with bolt groove 12 and vertical groove 13. These two grooves are connected. The ball 14 abuts against the bolt groove 12 and vertical groove 13. When the plug rod 11 is subjected to external force, the ball 14 will slide in the bolt groove 12 and vertical groove 13, thereby driving the rotating disk 9 to rotate. This structure allows the rotation angle of the rotating disk 9 to be dynamically adjusted, thereby achieving flexible control of the size of the damping hole.

[0058] Initially, the second arc-shaped hole 10 coincides with the first arc-shaped hole 8, and the damping hole area is at its maximum. When in contact with the bridge crane for buffering, the spring 6 plays the main buffering role. When the thrust is continuously applied to the piston rod 4, the rotating disk 9 will rotate inside the piston 7, causing the second arc-shaped hole 10 and the first arc-shaped hole 8 to gradually misalign. At this time, the damping hole gradually decreases, so the initial damping force is small and gradually increases later. By design, when the impact force is small, the area of ​​the damping hole is kept large, thereby providing a small damping force, so that the buffer can respond smoothly; when the impact force increases, the area of ​​the damping hole can be reduced to increase the damping force, thereby more effectively absorbing the impact energy and protecting the equipment from damage. This dynamic adjustment capability not only improves the adaptability and reliability of the buffer, but also extends the service life of the buffer and avoids the problems of bottoming out due to poor buffer support and rigid impact contact due to excessive support.

[0059] Please see Figure 1 and Figure 11 As a further embodiment of this utility model, a folding and retractable cover 15 is provided on the piston rod 4 between the damping cylinder 2 and the top seat 5;

[0060] One end of the folding shrink cover 15 is connected to the damping cylinder 2, and the other end is connected to the top seat 5. The folding shrink cover 15 is used to prevent dust and impurities from entering the damping system.

[0061] In this embodiment, a folding shrink cover 15 is provided on the piston rod 4 between the damping cylinder 2 and the top seat 5. One end of the cover is firmly connected to the damping cylinder 2, while the other end is tightly connected to the top seat 5. As the piston rod 4 reciprocates, the folding shrink cover 15 can flexibly unfold and retract, always maintaining effective wrapping of the piston rod 4.

[0062] The main function of the folding shrink cover 15 is to prevent external dust and impurities from entering the damping system, keeping the damping system clean and sealed. This design not only helps maintain the purity of the hydraulic oil and ensures stable adjustment of the damping force, but also reduces equipment failures caused by impurities, lowers maintenance costs and downtime. The folding shrink cover 15 is an application of existing technology.

[0063] The above embodiments are exemplary and not restrictive. Therefore, without departing from the spirit or basic characteristics of this utility model, any technical solutions that can be implemented in other specific forms are included in this utility model.

Claims

1. A bridge crane buffer structure comprising a base (1), a damping cylinder (2) arranged on the base (1), and a piston rod (4) slidingly inserted into the damping cylinder (2), characterized in that, The piston rod (4) is provided with a damping structure at one end inside the damping cylinder (2), the damping structure comprises: A piston (7) is arranged on the piston rod (4) and slides on the inner wall of the damping cylinder (2), a sealing mechanism is rotatably arranged in the cavity of the piston (7); A plug rod (11) is connected with the sealing mechanism and arranged in the cavity of the damping cylinder (2) at one end, when the piston (7) slides and plugs in the damping cylinder (2), the sealing mechanism rotates in the cavity of the piston (7) under the control of the plug rod (11), so as to realize real-time adjustment of the damping force size to adapt to the buffering requirements under different load and impact conditions.

2. A bridge crane bumper structure according to claim 1, characterized in that, An oil seal (3) is arranged at the top center of the damping cylinder (2), the oil seal (3) is in sliding fit with the piston rod (4) and is used for preventing hydraulic oil in the damping cylinder (2) from leaking.

3. A bridge crane bumper structure according to claim 2, characterized in that A top seat (5) is arranged at the top of the piston rod (4), and a spring (6) is arranged on the piston rod (4); One end of the spring (6) abuts against the top seat (5), and the other end abuts against the oil seal (3), the spring (6) plays a role of resetting and pre-tightening the piston rod (4) in the buffering process.

4. A bridge crane bumper structure according to claim 1, characterized in that, A plurality of first arc-shaped holes (8) are arranged in an annular array on the piston (7).

5. A bridge crane bumper structure according to claim 4, characterized in that The sealing mechanism comprises a rotating disc (9) rotating in the cavity of the piston (7), a plurality of second arc-shaped holes (10) arranged in an annular array on the rotating disc (9), and a plurality of balls (14) arranged on the inner wall of the central slot of the rotating disc (9); The second arc-shaped holes (10) correspondingly match the first arc-shaped holes (8) to adjust and control the size of the damping holes, and the adjustment of the damping force is realized by changing the overlapping area of the first arc-shaped holes (8) and the second arc-shaped holes (10).

6. A bridge crane bumper structure according to claim 5, characterized in that A bolt groove (12) and a vertical groove (13) are arranged on the plug rod (11) and are in communication; The bolt groove (12) and the vertical groove (13) abut against the balls (14) to control the rotation angle of the rotating disc (9), so as to realize dynamic adjustment of the size of the damping holes.

7. A bridge crane bumper structure as claimed in claim 3, characterized in that A folding and retracting cover (15) is arranged on the piston rod (4) between the damping cylinder (2) and the top seat (5); One end of the folding and retracting cover (15) is connected to the damping cylinder (2), and the other end is connected to the top seat (5), the folding and retracting cover (15) is used for preventing dust and impurities from entering the damping system.

8. A bridge crane bumper structure according to claim 7, characterized in that A rubber layer is arranged at the top of the top seat (5) to reduce the rigid contact with the bridge crane.

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