Front and back resistance reduction device for large and small pulleys in ship displacement

Abstract

The utility model provides a ship displacement large and small pulley front and back resistance reduction device which comprises a traction shackle, a pulley positioning sleeve, a positioning traction shaft, a first locking cap, a large pulley, a plurality of positioning clamping plates, a small pulley, a pulley shaft, a positioning sleeve, a clamping plate positioning shaft and a steel wire rope, one ends of the positioning clamping plates are connected through the positioning traction shaft, the other ends of the positioning clamping plates are connected through the clamping plate positioning shaft, a positioning area is reserved between every two adjacent positioning clamping plates, the positioning traction shaft in the positioning area is sleeved with a pulley positioning sleeve, the clamping plate positioning shaft in the positioning area is sleeved with a positioning sleeve, and the positioning traction shaft is provided with a traction shackle; the pulley shafts are respectively arranged on the positioning clamping plate between the positioning traction shaft and the clamping plate positioning shaft, a large pulley is arranged on the pulley shaft in the traction shackle direction, and a small pulley is arranged on the pulley shaft in the clamping plate positioning shaft direction. After the scheme is adopted, the structure is reasonable, the using effect is good, and stability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial equipment, in particular to a drag reducing device for shifting large and small pulleys forward and backward on ships. Background Art

[0002] At present, the lifting and passing devices of some ship locks, the ship up and down shifting devices in ship repair yards, and the industrial lifting devices all change the magnitude and direction of the force through the power combination of fixed pulleys, movable pulley blocks and wire ropes. Since the pulley diameters of the pulley blocks are the same, the force and speed of the wire rope when it is wound around the last pulley will vary. Due to the difference in the winding multiples of the pulley block when the wire rope is wound around the last pulley from left to right, the multi-pulley block will produce an eccentric offset between the pulley block and the cleat, causing the inclination angle of the end faces of the two sets of transverse pulleys to offset and generate a component force, which will cause the two sets of transverse pulley blocks to form an angle, and the contact surface between the pulley cleat and one end of the pulley to produce end-face braking friction resistance. In addition, the pulley block is more likely to tilt during no-load operation, causing the steel rope to pull on the pulley cleat and rub against the wire rope, causing damage to the steel rope, resulting in an unsafe situation. Summary of the Invention

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a ship's large and small pulley front and rear drag reducing device with reasonable structure, good use effect and high stability.

[0004] To achieve the above-mentioned purpose, the technical solution provided by the utility model is: a ship's large and small pulley front and rear drag reduction device, wherein it includes a traction shackle, a pulley positioning sleeve, a positioning traction shaft, a first locking cap, a large pulley, a positioning splint, a small pulley, a pulley shaft, a positioning sleeve, a splint positioning shaft, and a wire rope, wherein the positioning splints are multiple, one end of the positioning splints is connected by a positioning traction shaft, and the other end is connected by a splint positioning shaft, a positioning area is reserved between adjacent positioning splints, the positioning traction shaft in the positioning area is equipped with a pulley positioning sleeve, the splint positioning shaft in the positioning area is equipped with a positioning sleeve, a traction shackle is installed on the positioning traction shaft, and there are two pulley shafts, which are respectively installed on the positioning splints between the positioning traction shaft and the splint positioning shaft, a large pulley is installed on the pulley shaft in the direction of the traction shackle, and a small pulley is installed on the pulley shaft in the direction of the splint positioning shaft.

[0005] The large pulley and the small pulley are installed on the pulley shafts between adjacent positioning clamping plates.

[0006] The diameter of the large pulley is larger than that of the small pulley.

[0007] One end of the pulley shaft is provided with a first locking cap, and the other end passes through the corresponding positioning clamping plates in sequence and is connected with the third locking cap.

[0008] The ends of the positioning traction shaft and the clamping plate positioning shaft are respectively locked by corresponding second locking caps.

[0009] After adopting the above scheme, the utility model forms a longitudinal drag reduction device of large and small sizes through two groups of differentiated pulleys, so that the wire ropes of the drag-reducing fixed pulley and the drag-reducing movable pulley group form multiple pulley winding directions, winding from the large pulley group on the left to the right, and then from the right to the left of the inner small pulley group. Such wire rope winding direction can make the speed of the pulley group force symmetrical and uniform on the left and right, reduce the end face friction resistance increased by the offset of the speed force, thereby making it easier to lift heavy objects and tow ships. The structure after adopting this scheme is reasonable, the use effect is good, and the stability is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0011] Figure 2 It is a schematic diagram of the planar structure of the present utility model.

[0012] Figure 3 This is a schematic diagram of the rope winding of the longitudinal pulley assembly of the present invention.

[0013] Figure 4 This is a schematic diagram of the rope winding of the transverse pulley assembly of the present invention. DETAILED DESCRIPTION

[0014] The present invention will be further described below in conjunction with all the accompanying drawings. The preferred embodiments of the present invention are as follows: Figure 1 To the attached Figure 4 , a ship's front and rear drag reduction device for shifting large and small pulleys described in this embodiment includes a traction shackle 1, a pulley positioning sleeve 2, a positioning traction shaft 3, a first locking cap 4, a large pulley 5, a positioning splint 6, a small pulley 7, a pulley shaft 8, a positioning sleeve 9, a splint positioning shaft 10, and a wire rope 12, wherein the positioning splint 6 is a plurality of pieces, one end of the positioning splint 6 is connected by the positioning traction shaft 3, and the other end is connected by the splint positioning shaft 10. A positioning area is reserved between adjacent positioning splints 6, a pulley positioning sleeve 2 is mounted on the positioning traction shaft 3 in the positioning area, a positioning sleeve 9 is mounted on the splint positioning shaft 10 in the positioning area, a traction shackle 1 is installed on the positioning traction shaft 3, and two pulley shafts 8 are respectively installed on the positioning splint 6 between the positioning traction shaft 3 and the splint positioning shaft 10. A large pulley 5 is installed on the pulley shaft 8 in the direction of the traction shackle 1, and a small pulley 7 is installed on the pulley shaft 8 in the direction of the splint positioning shaft 10.

[0015] The large pulley 5 and the small pulley 7 are mounted on a pulley shaft 8 between adjacent positioning clamps 6. The diameter of the large pulley 5 is larger than that of the small pulley 7. One end of the pulley shaft 8 is fitted with a first locking cap 4, while the other end passes through the corresponding positioning clamp 6 and connects to the third locking cap. The ends of the positioning traction shaft 3 and the clamp positioning shaft 10 are locked by corresponding second locking caps 11.

[0016] After adopting the above scheme, two sets of differentiated pulleys are used to form the longitudinal drag reduction device of large and small sizes in front and back, so that the wire rope of the fixed pulley and the movable pulley group of drag reduction forms multiple pulley winding directions, winding from the left large pulley group to the right, and then from the right side of the inner small pulley group to the left. Such a wire rope winding direction can make the speed of the pulley group force symmetrical and uniform, reducing the end face friction resistance increased by the offset of the speed force, making it easier to lift heavy objects and tow ships. Due to the use of the multi-wheel form of the longitudinal front large pulley group and the rear small pulley group, the speed of the longitudinal soft rope winding force can be made symmetrical and uniform through the combination of the front and rear large and small pulley groups. Compared with the offset difference of the force and speed of the lateral multi-pulley group, the size and speed of the wire rope of the fixed pulley group and the movable pulley group changes from the left to the last pulley on the right. It produces a lateral tilt eccentricity, which causes the friction resistance and snail force to change when the pulley contacts the end face of the pulley splint (which can be seen from the attached Figure 3 With attached Figure 4 (shown is a schematic diagram comparing the rope winding of the forward pulley block and the transverse pulley block);

[0017] Rope winding method 1: The rope winding method of the longitudinal fixed pulley and movable pulley is to first wind the large pulley from left to right, then wind the small pulley inside it from right to left, and then wind the last pulley to control the rope head. The characteristics of the above pulley are:

[0018] 1. There is the advantage of the movable pulley block in saving force.

[0019] 2. There is a change in the speed ratio of the large and small pulleys when the ropes are wound.

[0020] 3. There are large and small pulleys that are wound around the rope from left to right and then from right to left. The design of the longitudinal pulley group can make the force points symmetrically balanced and no wire rope force will appear.

[0021] Rope winding method 2: The rope winding method of the horizontal fixed pulley group and the movable pulley group is to wind the rope from left to right, wrap the pulleys until the last pulley is controlled and the wire head is tied. The characteristics of the above pulley group are:

[0022] 1. There is the advantage of the movable pulley block in saving force.

[0023] 2. When the pulley rope is wound from the first pulley to the last pulley, there is a change in the magnitude of the proportional force of the pulley speed from fast to slow, which will cause the fixed pulley group and the movable pulley group to have a speed and force offset and an inclination angle, increasing the friction resistance of the end contact surface.

[0024] 3. When the pulley block is tilted, the wire rope may rub against the pulley splint end, damaging the wire rope and increasing resistance.

[0025] Through the above-mentioned design discussion of the structural principles of the longitudinal and transverse pulley groups, the longitudinal pulley group can further reduce resistance and save labor.

[0026] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any changes made based on the shape and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A drag reduction device for shifting large and small pulleys forward and backward on a ship, characterized by: It includes a traction shackle (1), a pulley positioning sleeve (2), a positioning traction shaft (3), a first locking cap (4), a large pulley (5), a positioning splint (6), a small pulley (7), a pulley shaft (8), a positioning sleeve (9), a splint positioning shaft (10), and a wire rope (12). The positioning splint (6) is composed of multiple pieces, one end of which is connected by the positioning traction shaft (3), and the other end is connected by the splint positioning shaft (10). A positioning area is reserved between adjacent positioning splints (6). A pulley positioning sleeve (2) is mounted on the positioning traction shaft (3) of the positioning zone, a positioning sleeve (9) is mounted on the splint positioning shaft (10) of the positioning zone, a traction shackle (1) is mounted on the positioning traction shaft (3), two pulley shafts (8) are mounted on the positioning splint (6) between the positioning traction shaft (3) and the splint positioning shaft (10), a large pulley (5) is mounted on the pulley shaft (8) in the direction of the traction shackle (1), and a small pulley (7) is mounted on the pulley shaft (8) in the direction of the splint positioning shaft (10).

2. A ship's drag reduction device for shifting large and small pulleys forward and backward according to claim 1, characterized in that: The large pulley (5) and the small pulley (7) are mounted on the pulley shaft (8) between adjacent positioning splints (6).

3. The device for reducing drag by shifting large and small pulleys forward and backward on a ship according to claim 1, characterized in that: The diameter of the large pulley (5) is larger than the diameter of the small pulley (7).

4. A ship's drag reduction device for shifting large and small pulleys forward and backward according to claim 1, characterized in that: One end of the pulley shaft (8) is provided with a first locking cap (4), and the other end passes through corresponding positioning clamps (6) in sequence and is connected to a third locking cap.

5. The device for reducing drag by shifting large and small pulleys forward and backward on a ship according to claim 1, characterized in that: The ends of the positioning traction shaft (3) and the splint positioning shaft (10) are respectively locked by corresponding second locking caps (11).

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