Anti-drop pulley block

Abstract

This invention provides an anti-derailment pulley system that not only solves the problem of rope detachment when the pulley is raised or lowered to a high position during hoisting, but also brakes when the rope is extended or released too quickly, lubricates the rope after it has been bent by the pulley for a long time, and facilitates restoration after braking. The technical solution includes a hoisting frame, a lifting box located below the hoisting frame, and the hoisting frame and the lifting box connected by a pulley system. A lifting ring is fixedly connected to the lower end of the lifting box. The pulley system is characterized in that it includes multiple upper pulleys that are rotatably connected laterally on the hoisting frame, and lower pulleys that are obliquely arranged and correspond to the positions of the upper pulleys inside the lifting box. A lifting line is provided between the upper pulleys and the lower pulleys, and the entry and exit points of the lifting line on the lower pulleys correspond to the positions of the upper pulleys.

Description

Technical Field

[0001] This invention relates to the field of lifting, and in particular to an anti-detachment pulley block. Background Technology

[0002] Cranes are inevitably used when lifting heavy objects. During the lifting process, cranes use hooks to lift the load. Between the crane and the bucket, there is a force amplification structure to amplify the force, so that heavier objects can be lifted. Among these, the most widely used method is to use pulley blocks to amplify the force. When the object is lifted to a high place, the distance between the hook and the boom is shortened. When the distance between the pulley blocks and the hooks is close, a diagonal tension is generated, which causes the rope to fall off the pulley blocks.

[0003] Meanwhile, during the force amplification process, the main principle is to use the winding rope, which increases the distance of the winding rope and shortens the object's upward speed. However, the winding speed of the rope at the very end is still very fast. In order to prevent the rope from extending too quickly and causing the hoisted object to shake violently or fall off, it is necessary to brake when the rope is released too quickly. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides an anti-derailment pulley block, which not only solves the problem of rope detachment when the pulley is raised or lowered to a high position during hoisting, but also brakes when the extension and retraction are too fast, lubricates the rope after it has been bent by the pulley for a long time, and is easy to restore after braking.

[0005] The technical solution includes a lifting frame, a lifting box located below the lifting frame, and the lifting frame and the lifting box connected by a pulley block. A lifting ring is fixedly connected to the lower end of the lifting box. The pulley block is characterized in that it includes multiple upper pulleys that are rotatably connected laterally on the lifting frame, and lower pulleys that are obliquely arranged and correspond to the positions of the upper pulleys inside the lifting box. A lifting line is provided between the upper pulleys and the lower pulleys, and the entry and exit points of the lifting line on the lower pulleys correspond to the positions of the upper pulleys.

[0006] Preferably, both the upper pulleys and the lower pulleys are an even number, with two more upper pulleys than lower pulleys, and the inclination of the lower pulleys corresponding to the distance between adjacent upper pulleys.

[0007] Preferably, the device also includes a lifting line locator, which includes a locating box. The locating box has lubrication mechanisms at its left and right ends. A brake block that cooperates with the lifting line is vertically slidably connected inside the locating box. The lower end of the brake block is arranged obliquely towards the center. An oblique guide block is provided inside the locating box at a position corresponding to the position of the brake block. A return spring is provided between the brake block and the lower end face of the locating box.

[0008] Preferably, the lubrication mechanism includes a lubrication roller rotatably connected inside the positioning box, an annular groove on the lubrication roller that cooperates with the lifting line, a supply wheel below the lubrication roller that cooperates with the lubrication roller, an annular protrusion on the supply wheel that cooperates with the annular groove, and a feeding plate that cooperates with the lubrication roller fixedly connected to the left and right ends of the positioning box, respectively.

[0009] Preferably, the feeding plate serves to enclose the lubrication mechanism into a cavity, and the contact area between the feeding plate and the lubrication roller is provided with flexible feeding pieces.

[0010] Preferably, the brake block has a vertically arranged wire groove that cooperates with the lifting line, and the wire groove is provided with anti-slip texture. A sliding block is provided on the outside of the brake block, and the sliding block is connected to the lower end face of the positioning box by a return spring. The upper end of the positioning box is provided with a limiting rod to limit the movement of the brake block.

[0011] Preferably, the lifting line positioner is located at the left and right ends of the upper end face of the lifting box, and the lifting line positioner corresponds to the outermost lifting line so that the lifting line passes through the lifting line positioner.

[0012] Preferably, the brake block makes frictional contact with the lifting line. When the downward speed of the lifting line exceeds a set value, it will drive the brake block to move downward and brake the downward movement of the lifting line.

[0013] Preferably, the outer surfaces of the lubrication roller and the supply wheel are covered with a flexible rubber layer, and each flexible rubber layer is provided with a water storage tank.

[0014] Preferably, the lifting box is provided with a fixing ring for fixing the end of the lifting line, and the lower pulleys inside the lifting box are arranged symmetrically.

[0015] Preferably, the lifting box is provided with a fixing ring, and the lifting frame is provided with a fixing hook that cooperates with the fixing ring.

[0016] The beneficial effects of this invention are:

[0017] 1. Solved the problem of ropes slipping off when the pulleys are raised to a high position during hoisting;

[0018] 2. It can brake when the extension and retraction are too fast;

[0019] 3. It serves as a lubricant for ropes that have been bent by pulleys for a long time;

[0020] 4. Convenient for recovery after braking ends. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall invention.

[0022] Figure 2This is a cross-sectional view of the present invention.

[0023] Figure 3 This is a structural diagram of the sliding wheel of the present invention.

[0024] Figure 4 This is an assembly structure diagram of the present invention.

[0025] Figure 5 This is a schematic diagram of the overall structure of the present invention.

[0026] Figure 6 This is a schematic diagram of the lifting line positioner of the present invention.

[0027] Figure 7 This is a cross-sectional view of the lifting line positioner of the present invention.

[0028] Figure 8 This is a schematic diagram of the braking block of the present invention.

[0029] Figure 9 This is a structural diagram of the brake block of the present invention.

[0030] Figure Labels

[0031] 1. Lifting frame; 2. Lifting box; 3. Lifting ring; 4. Upper pulley; 5. Lower pulley; 6. Lifting line; 7. Positioning box; 8. Brake block; 9. Angled guide block; 10. Return spring; 11. Lubricating roller; 12. Annular groove; 13. Supply wheel; 14. Annular protrusion; 15. Material feeding plate; 16. Threading groove; 17. Anti-slip texture; 18. Sliding block; 19. Limiting rod; 20. Fixing ring. Detailed Implementation

[0032] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0033] In this embodiment, taking the configuration of two lower pulleys 5 and four upper pulleys 4 as an example, the lifting rope is a steel wire rope. The upper pulleys 4 and lower pulleys 5 are respectively set at the left and right ends of the lifting frame 1 and the lifting box 2 and arranged symmetrically. For example, the two lower pulleys 5 are located at the left and right ends of the lifting box 2, and the two lower pulleys 5 are arranged at an angle. There are four upper pulleys 4, which are located at the left and right ends of the lifting frame 1. The upper pulleys 4 are arranged coaxially and the rotating shaft is arranged laterally. The lower pulleys 5 are arranged at an angle, and the degree of inclination corresponds to that of the upper pulleys 4.

[0034] First, the wire rope needs to be threaded onto the upper pulley 4 and the lower pulley 5. There are two wire ropes, located at the left and right ends respectively. The lower pulley 5 on the right side at the bottom is arranged with its front end facing left and its rear end facing right. Since the two sides are symmetrically arranged, taking the right wire rope as an example, one end of the wire rope is fixedly connected to the fixed ring 20 in the middle of the lifting frame. Then, the extended end first extends upward and wraps around the second upper pulley 4 from the right to the left at the top. Then, the wire rope continues to extend downward from the front end of the upper pulley 4 to the front end of the lower pulley 5, wraps around the lower pulley 5, and extends upward from the rear end of the lower pulley 5. Then, the wire rope passes through the upper pulley 4 located on the far right and extends outward to connect to the winding mechanism. The inclination of the front and rear ends of the lower pulley 5 corresponds to the position of the upper pulley 4, so that the wire rope is arranged vertically between the upper pulley 4 and the lower pulley 5.

[0035] Lifting line 6 positioners are respectively provided at the left and right ends of the upper end face of the lifting box 2. The lifting line 6 positioners cooperate with the outermost lifting line 6. When the outermost lifting line 6 is lifted, it moves upward. The lifting line 6 positioners only play a lubricating role and do not play a braking role during the upward movement of the inner lifting line 6. When the lifted object moves downward, the outermost lifting line 6 will move downward. At this time, the lifting line 6 positioners not only play a lubricating role, but also brake when the downward speed of the lifting line 6 exceeds the set value. When the downward speed of the lifting line 6 is slow and does not reach the set value, the braking effect will not be applied.

[0036] During lubrication, storage cavities for storing lubricating oil are located at both ends of the lifting box 2. These cavities contain lubricating oil, and a lubrication roller 11 is rotatably connected to the upper end of each cavity. The lubrication roller 11 has an annular groove 12, and a flexible rubber layer is provided on its outer surface and within the annular groove 12. Multiple water tanks are provided on the flexible rubber layer, storing a certain amount of lubricating fluid. This allows the lubricating fluid to be applied to the lifting rope when the annular groove 12 contacts it. To prevent excessive lubricating fluid on the lifting rope, the lower end of the lubrication roller 11 is not directly immersed in the lubricating fluid, but rather supplied through a feed wheel 13. The lower end is immersed in lubricating fluid, and the supply wheel 13 and the lubrication roller 11 are connected and rolled together. During the contact between the lubrication roller 11 and the supply wheel 13, the supply wheel 13 will adhere the lubricating fluid on its surface to the lubrication roller 11. In order to prevent excessive lubricating fluid on the lubrication roller 11, a deflector plate 15 is provided on the side of the lubrication roller 11 to contact the lubrication roller 11 and clean the excess lubricating fluid on the surface of the lubrication roller 11. The deflector plate 15 is provided with flexible deflector pieces. The flexible deflector pieces are shaped to match the surface of the lubrication roller 11. At the same time, the outer circumference of the flexible deflector pieces extends downward to guide the lubricating fluid and prevent the lubricating fluid from flowing out to other parts.

[0037] Two brake blocks 8 are located in the middle of the lifting box 2, at the front and rear ends respectively. The two brake blocks 8 are symmetrically arranged, and arc-shaped wire grooves are formed on the sides of the two brake blocks 8 that are close together. Anti-slip textures 17 are provided in the wire grooves. At the same time, obliquely arranged guide blocks 9 are provided on the outer sides of the lifting box 2, which guide the two brake blocks 8 towards the center. Sliding blocks 18 are fixedly connected to the outer sides of the two brake blocks 8. A return spring 10 is provided between the lower end of the sliding block 18 and the lifting box 2. The return spring 10 provides a certain upward thrust to the brake blocks 8. During the downward movement of the lifting line 6, it passes through the wire groove 16 and rubs against the wire groove 16. When the downward speed of the lifting line 6 has not reached the set value, the brake blocks 8 will overcome the friction under the action of the return spring 10 and maintain their initial upward position. When the lifting box 2 moves downward too fast, and the speed of the lifting rope exceeds the set value, the lifting rope will drive the brake block 8 downward. As the brake block moves downward, it will move towards the center through the action of the inclined guide block 9 and lock the lifting rope. Because of the pulley system principle, when the lifting box 2 moves downward by one meter, the distance that the outermost lifting rope will move is a multiple of one meter. The size of the multiple depends on the number of pulleys involved. Therefore, when the lifting box 2 moves downward too fast, the speed of the outermost lifting rope is faster, which can drive the brake block 8 downward. This causes the brake block 8 to move downward and be guided by the inclined guide block 9 to lock, thus braking the lifting rope. When the braking is completed and the braking needs to be canceled, simply pull the outermost lifting rope upward, and the brake block 8 will move upward a certain distance and lose braking force.

Claims

1. A pulley block for preventing detachment, comprising a lifting frame (1), a lifting box (2) located below the lifting frame (1), the lifting frame and the lifting box (2) being connected via a pulley block, and a lifting ring (3) fixedly connected to the lower end of the lifting box (2), characterized in that, The pulley block includes multiple upper pulleys (4) that are laterally rotatably connected on the hoisting frame (1). The hoisting box (2) is provided with lower pulleys (5) that are obliquely arranged and correspond to the positions of the upper pulleys (4). A hoisting line (6) is provided between the upper pulleys (4) and the lower pulleys (5). The entry and exit points of the hoisting line (6) of the lower pulleys (5) correspond to the positions of the upper pulleys (4). It also includes a lifting line (6) locator, which includes a locating box (7). The left and right ends of the locating box (7) are respectively provided with lubrication mechanisms. A brake block (8) that cooperates with the lifting line (6) is vertically slidably connected in the locating box (7). The lower end of the brake block (8) is arranged obliquely towards the middle. An oblique guide block (9) is provided in the locating box (7) at the position corresponding to the brake block (8). A return spring (10) is provided between the brake block (8) and the lower end face of the locating box (7). The lifting line (6) positioner works in conjunction with the outermost lifting line (6). The outermost lifting line (6) moves upward during hoisting, while the lifting line (6) positioner only lubricates the inner lifting line (6) during its upward movement and does not brake it. When the hoisted object moves downward, the outermost lifting line (6) moves downward. At this time, the lifting line (6) positioner not only lubricates the object but also brakes it when the speed of the lifting line (6) moving downward exceeds the set value. When the speed of the lifting line (6) moving downward is slow and does not reach the set value, the braking effect will not be applied. The lubrication mechanism includes a lubrication roller (11) rotatably connected in the positioning box (7). The lubrication roller (11) has an annular groove (12) that cooperates with the lifting line (6). A supply wheel (13) that cooperates with the lubrication roller (11) is provided below the lubrication roller (11). An annular protrusion (14) that cooperates with the annular groove (12) is provided on the supply wheel (13). The left and right ends of the positioning box (7) are respectively fixedly connected to a material-pulling plate (15) that cooperates with the lubrication roller (11). The material-pulling plate (15) serves to enclose the lubrication mechanism into a cavity. A flexible material-pulling piece is provided at the contact part between the material-pulling plate (15) and the lubrication roller (11). The outer surfaces of the lubrication roller (11) and the supply wheel (13) are covered with flexible rubber layers, and each flexible rubber layer is provided with a water storage tank. The water tank stores lubricating fluid. The lower end of the lubricating roller (11) is not directly immersed in the lubricating fluid, but is immersed in the lubricating fluid through the lower end of the supply wheel (13). The flexible material feeding piece matches the surface shape of the lubricating roller (11), and the outer circumference of the flexible material feeding piece extends downward.

2. The anti-drop pulley block according to claim 1, characterized in that, The number of upper pulleys (4) and lower pulleys (5) is even, with two more upper pulleys (4) than lower pulleys (5). The inclination of the lower pulleys (5) corresponds to the distance between adjacent upper pulleys (4).

3. The anti-drop pulley block according to claim 1, characterized in that, The brake block (8) has a vertically arranged wire groove (16) that cooperates with the lifting line (6). The wire groove (16) is provided with anti-slip texture (17). The brake block (8) has a sliding block (18) on its outer side. The sliding block (18) is connected to the lower end face of the positioning box (7) by a return spring (10). The upper end of the positioning box (7) is provided with a limiting rod (19) to limit the brake block (8).

4. The anti-drop pulley block according to claim 1, characterized in that, The lifting line (6) locator is located at the left and right ends of the upper end face of the lifting box (2). The lifting line (6) locator corresponds to the outermost lifting line (6) and the lifting line (6) passes through the lifting line (6) locator.

5. The anti-drop pulley block according to claim 1, characterized in that The brake block (8) makes frictional contact with the lifting line (6). When the downward movement speed of the lifting line (6) exceeds the set value, it will drive the brake block (8) to move downward and brake the downward movement of the lifting line (6).

6. The anti-drop pulley block according to claim 1, wherein The lifting box (2) is provided with a fixing ring (20) for fixing the end of the lifting line (6), and the pulleys (5) inside the lifting box (2) are symmetrically arranged.

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