Vibration reduction pulley block of crane

Abstract

A damping pulley block of a crane relates to the technical field of cranes, is mounted on a trolley frame, and comprises a pulley yoke, a pulley block, a guide column and a damping component, a pulley yoke is arranged above the trolley frame, and pulley blocks are mounted at the two ends of the pulley yoke; a plurality of vibration reduction assemblies are arranged between the pulley yoke and the trolley frame; the pulley yoke is vertically matched with two guide columns in a sliding manner, the tops of the guide columns are in threaded connection with limiting nuts, and the bottoms of the guide columns are correspondingly connected with the trolley frame in a fastening manner; the pulley yoke is in vertical sliding fit with the two guide columns, the top of each guide column is provided with a limiting nut in threaded connection, and the bottom of each guide column is firmly connected to the trolley frame. When external force is applied to the pulley yoke, the pulley yoke can float up and down along the guide column, and therefore impact force can be effectively counteracted through the vibration reduction assembly. And the overall structure stability is high.

Description

Technical Field

[0001] This utility model relates to the field of crane technology, and in particular to a crane vibration damping pulley block. Background Technology

[0002] Pulley blocks are a key component of a crane's hoisting mechanism. Their design varies depending on the working level and wire rope diameter. The wire rope, in conjunction with the pulley block and hook assembly, enables the lifting and lowering of heavy objects. During crane hoisting, especially under significant impact (such as when an electromagnetic crane releases its electromagnetic chuck or when a forging crane uses a tilter to turn over forgings), the pulley block bears the primary load. In this situation, the wire rope transmits the force directly to the trolley via the pulleys, and the trolley then transfers the force to the crane frame via its wheels.

[0003] Such large impact loads not only significantly shorten the service life of the trolley and cable tray, but may also cause serious structural damage or even catastrophic accidents, resulting in huge economic losses for enterprises. To mitigate this situation, it is necessary to take effective vibration reduction measures to protect equipment and ensure operational safety.

[0004] Chinese patent (publication number: CN211444757U) discloses a vibration damping system for a high-speed quay crane trolley lifting pulley. The vibration damping device includes a connecting seat, a hydraulic damper, and a connecting rod. The connecting seat is fixedly mounted on the quay crane trolley frame, and the hydraulic damper is vertically arranged between the quay crane trolley frame and the lifting pulley. One end of the hydraulic damper is hinged to the connecting seat, and the other end of the hydraulic damper is fixedly connected to the rotation shaft of the lifting pulley via the connecting rod. The hydraulic damper is in a suspended state and needs to withstand a large tensile force. Once it fails, it is easy to cause a safety accident. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, this utility model discloses a crane vibration damping pulley block.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0007] A vibration damping pulley block for a crane is installed on a trolley frame and includes a pulley frame, pulley blocks, guide columns, and vibration damping components. The pulley frame is located above the trolley frame, and pulley blocks are installed at both ends of the pulley frame. Multiple vibration damping components are provided between the pulley frame and the trolley frame. The pulley frame has two guide columns that slide vertically together. The top of the guide columns is threaded with a limit nut, and the bottom of the guide columns is correspondingly and fastened to the trolley frame.

[0008] Preferably, the vibration damping assembly includes a first truncated cone spiral spring connected to the trolley frame, a limiting guide rod inserted into the top of the first truncated cone spiral spring, and the limiting guide rod being vertically and fastened to the pulley frame.

[0009] Preferably, the bottom of the first truncated cone spiral spring is provided with a second truncated cone spiral spring and a third truncated cone spiral spring; the tip of the first truncated cone spiral spring is set upward, the tips of the first truncated cone spiral spring and the second truncated cone spiral spring are set opposite to each other, and a connecting tray is provided between the first truncated cone spiral spring and the second truncated cone spiral spring; the tips of the second truncated cone spiral spring and the third truncated cone spiral spring are set opposite to each other, and a connecting rod is provided between the second truncated cone spiral spring and the third truncated cone spiral spring; the third truncated cone spiral spring is correspondingly connected to the trolley frame through the positioning tray.

[0010] Preferably, the guide post passes through the trolley frame, and a bushing is provided at the top of the trolley frame corresponding to the position of the guide post. The central hole of the bushing is a tapered hole, and the guide post body is provided with a tapered boss that corresponds to and matches the tapered hole of the bushing. A locking nut is threadedly connected to the guide post body that extends out of the bottom of the trolley frame.

[0011] Preferably, the pulley frame is slidably engaged with the guide post via a guide sleeve.

[0012] Preferably, a buffer pad is provided on the column body between the guide post and the limiting nut.

[0013] Preferably, the pulley frame is equipped with a pulley cover at the position corresponding to the pulley block.

[0014] By adopting the technical solution described above, this utility model has the following beneficial effects:

[0015] This utility model discloses a vibration-damping pulley block for cranes, which has a simple structure, is easy to assemble, and has low production costs. Multiple vibration-damping components are installed between the pulley frame and the trolley frame. These components reduce the impact of the lifting mechanism on the trolley and bridge frame, decreasing the vibration of the lifting mechanism, thereby extending the crane's service life and improving its safety. The pulley frame forms a vertical sliding fit with two guide columns. The top of the guide columns is equipped with a threaded limiting nut, and the bottom is firmly connected to the trolley frame. When the pulley frame is subjected to external force, it can float up and down along the guide columns, effectively offsetting the impact force through the vibration-damping components. The overall structure has high stability.

[0016] This invention further adds a second and a third conical spiral spring to the bottom of the first conical spiral spring, which significantly improves the vibration reduction and impact resistance of the vibration damping assembly. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a side view of the present invention;

[0019] Figure 3 This is a top view of the present invention;

[0020] Figure 4 This is a schematic diagram of the vibration damping assembly.

[0021] Figure 5 This is a schematic diagram of the structure for connecting the tray;

[0022] Figure 6 This is a schematic diagram of the positioning tray.

[0023] In the diagram: 1. Trolley frame; 2. Pulley frame; 3. Pulley block; 4. Guide column; 5. Vibration damping assembly; 5-1. First conical spiral spring; 5-2. Limiting guide rod; 5-3. Second conical spiral spring; 5-4. Third conical spiral spring; 5-5. Connecting tray; 5-6. Connecting rod; 5-7. Positioning tray; 6. Limiting nut; 7. Locking nut; 8. Guide sleeve; 9. Bushing; 10. Buffer pad; 11. Pulley cover. Detailed Implementation

[0024] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right" indicating the orientation or positional relationship, they are only corresponding to the drawings of this application for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation.

[0025] Example 1, in conjunction with Appendix Figures 1-6 A vibration-damping pulley block for a crane is installed on a trolley frame 1 and includes a pulley frame 2, pulley blocks 3, guide columns 4, and vibration-damping components 5. The pulley frame 2 is positioned above the trolley frame 1, and pulley blocks 3 are mounted at both ends of the pulley frame 2. Multiple vibration-damping components 5 are installed between the pulley frame 2 and the trolley frame 1. These vibration-damping components 5 are used to reduce the impact of the hoisting mechanism on the trolley and bridge frame, reduce the vibration of the hoisting mechanism, thereby extending the service life of the crane and improving its safety.

[0026] It should be noted that the number of vibration damping components 5 is even and they are divided into two groups. The two groups of vibration damping components 5 are symmetrically arranged on both sides of the pulley frame 2 so that the pulley frame 2 is subjected to uniform force.

[0027] The vibration damping assembly 5 includes a first truncated cone spiral spring 5-1, which is connected to the trolley frame 1. A limiting guide rod 5-2 is inserted into the top of the first truncated cone spiral spring 5-1, and the limiting guide rod 5-2 is vertically fixed to the bottom of the pulley frame 2, thereby limiting the horizontal movement of the first truncated cone spiral spring 5-1. A pagoda-shaped truncated cone spiral spring was chosen because it can withstand a large load in a limited space and absorb more deformation energy, making the entire vibration damping assembly 5 compact and possessing excellent vibration damping and impact resistance characteristics.

[0028] To further enhance the performance of vibration damping component 5, as shown in the attached document... Figure 4 As shown, a second cone-shaped spiral spring 5-3 and a third cone-shaped spiral spring 5-4 are added to the bottom of the first cone-shaped spiral spring 5-1. The tip of the first cone-shaped spiral spring 5-1 faces upward, while the tip of the second cone-shaped spiral spring 5-3 faces downward. The two are coaxially connected by a connecting tray 5-5, as shown in the attached figure. Figure 5 As shown. The tips of the second conical spiral spring 5-3 and the third conical spiral spring 5-4 are opposite each other and are kept coaxial by the connecting rod 5-6. The third conical spiral spring 5-4 is connected to the trolley frame 1 through the positioning tray 5-7, as shown in the attached figure. Figure 6 As shown, the positioning tray 5-7 also restricts the horizontal displacement of the third conical spiral spring 5-4. This coaxial connection design significantly improves the vibration damping and shock resistance of the damping assembly 5.

[0029] The pulley frame 2 and the two guide posts 4 form a vertical sliding fit. The top of the guide posts 4 is equipped with a threaded limit nut 6, and the bottom is firmly connected to the trolley frame 1. When the pulley frame 2 is subjected to external force, it can float up and down along the guide posts 4, thus effectively offsetting the impact force through the vibration damping component 5.

[0030] Example 2, in conjunction with Appendix Figure 1 A vibration-damping pulley system for cranes differs from Embodiment 1 in that, in Embodiment 1, a guide post 4 penetrates through the trolley frame 1, and a bushing 9 is installed at the top of the trolley frame 1 corresponding to the position of the guide post 4. The central hole of the bushing 9 is designed as a tapered hole, and the body of the guide post 4 has a matching tapered boss. This design not only ensures the verticality of the guide post 4 but also significantly enhances its impact resistance. The portion of the guide post 4 extending out of the bottom of the trolley frame 1 is connected to a locking nut 7 via a thread, and the locking nut 7 and the bushing 9 together ensure the stable fixation of the guide post 4.

[0031] Furthermore, the pulley frame 2 forms a sliding engagement with the guide post 4 via the guide sleeve 8, ensuring that the pulley frame 2 can float smoothly up and down. In addition, a buffer pad 10 is fitted onto the portion of the guide post 4 located between the guide sleeve 8 and the limiting nut 6. When the pulley frame 2 floats upward, the buffer pad 10 can effectively reduce the impact force on the limiting nut 6, thereby protecting the mechanical structure and extending its service life.

[0032] Example 3, in conjunction with the appendix Figures 1-2 A vibration damping pulley block for a crane, based on embodiment 1 or 2, wherein the pulley frame 2 is equipped with a pulley cover 11 at the position corresponding to the pulley block 3, and the pulley cover 11 can prevent the wire rope from falling off.

[0033] The parts of this utility model not described in detail are prior art. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that this utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and are intended to include all changes that fall within the meaning and scope of equivalents within this utility model.

Claims

1. A vibration damping pulley block for a crane, mounted on a trolley frame (1), characterized in that: It includes a pulley frame (2), a pulley block (3), a guide post (4) and a vibration damping component (5); the pulley frame (2) is provided on the top of the trolley frame (1), and pulley blocks (3) are installed at both ends of the pulley frame (2); multiple vibration damping components (5) are provided between the pulley frame (2) and the trolley frame (1); the pulley frame (2) has two guide posts (4) in vertical sliding fit, the top of the guide post (4) is threaded with a limit nut (6), and the bottom of the guide post (4) is correspondingly fastened to the trolley frame (1).

2. The crane vibration damping pulley block as described in claim 1, characterized in that: The vibration damping component (5) includes a first truncated cone spiral spring (5-1) connected to the trolley frame (1). A limit guide rod (5-2) is inserted into the top of the first truncated cone spiral spring (5-1). The limit guide rod (5-2) is vertically and fastened to the pulley frame (2).

3. The crane vibration damping pulley block as described in claim 2, characterized in that: The bottom of the first truncated cone spiral spring (5-1) is provided with a second truncated cone spiral spring (5-3) and a third truncated cone spiral spring (5-4); the tip of the first truncated cone spiral spring (5-1) is set upward, the tips of the first truncated cone spiral spring (5-1) and the second truncated cone spiral spring (5-3) are set opposite to each other, and a connecting tray (5-5) is provided between the first truncated cone spiral spring (5-1) and the second truncated cone spiral spring (5-3); the tips of the second truncated cone spiral spring (5-3) and the third truncated cone spiral spring (5-4) are set opposite to each other, and a connecting rod (5-6) is provided between the second truncated cone spiral spring (5-3) and the third truncated cone spiral spring (5-4), and the third truncated cone spiral spring (5-4) is correspondingly connected to the trolley frame (1) through the positioning tray (5-7).

4. The crane vibration damping pulley block as described in claim 1, characterized in that: The guide post (4) passes through the trolley frame (1). A bushing (9) is provided at the top of the trolley frame (1) corresponding to the position of the guide post (4). The central hole of the bushing (9) is a tapered hole. The guide post (4) has a tapered boss that matches the tapered hole of the bushing (9). The guide post (4) is threaded through the bottom of the trolley frame (1) and a locking nut (7) is connected.

5. The crane vibration damping pulley block as described in claim 1, characterized in that: The pulley frame (2) slides with the guide post (4) through the guide sleeve (8).

6. The crane vibration damping pulley block as described in claim 5, characterized in that: The guide post (4) is fitted with a buffer pad (10) between the guide sleeve (8) and the limiting nut (6).

7. The crane vibration damping pulley block as described in claim 1, characterized in that: The pulley frame (2) is equipped with a pulley cover (11) at the position corresponding to the pulley block (3).

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