A rope pulley
By designing a rope pulley structure with chrysanthemum petal-shaped protrusions and grooves, the problems of slippage and wear between the rope pulley and the rope were solved, achieving higher friction and wear resistance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YANGZHOU AWAHE IND TECHNOLOGY CO LTD
- Filing Date
- 2025-08-14
- Publication Date
- 2026-07-07
Smart Images
Figure CN224462144U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of descent device technology, and in particular to a rope pulley. Background Technology
[0002] Descending devices are widely used for rescue and escape in high-rise buildings, ships, and other similar locations. A descending device requires a rope to be wound around a pulley, which, in conjunction with other components, allows the device to move up and down along the rope. Traditional pulleys have smooth surfaces in contact with the rope, resulting in low friction and a tendency for slippage between the rope and the pulley.
[0003] The invention patent application with application number 202011192045.5 discloses an involute rope reel. Because the first and second winding wheels have involute protrusions extending outwards from the involute of the reel on their surfaces near the reel, the deceleration rope can make surface contact with these protrusions during rotation, preventing excessive slippage due to point contact. Furthermore, since the involute protrusions are arranged along the involute direction of the reel, the principle of the involute allows the reel to generate pre-load during movement. The detachment force from the descent rope is controlled by the fact that the tangent direction of the involute bulge at the intersection of the involute bulge and the descent rope is perpendicular to the tangent direction of the descent rope at the intersection. Therefore, during the motion, when the descent rope comes into contact with the involute bulge, the involute bulge will generate a force on the descent rope in the opposite direction to the detachment force. Furthermore, the descent rope is perpendicular to the tangent direction at the intersection of the descent rope and the involute bulge, thus restricting the descent rope from swinging along both sides of the intersection and preventing the descent rope from detaching from the reel, resulting in good structural stability.
[0004] This involute rope pulley uses involute protrusions to increase friction between the pulley and the rope, preventing slippage. However, the involute protrusions and the rope have a linear surface contact, resulting in concentrated contact area and increased local pressure. This can lead to rapid wear of the rope's surface fibers, shortening its service life. Furthermore, repeated friction can damage the rope's internal structure, reducing its tensile strength. In addition, the involute protrusions are easily worn during friction with the rope and must be replaced promptly; otherwise, their performance will decline sharply. Summary of the Invention
[0005] The purpose of this utility model is to overcome the above-mentioned problems existing in the prior art and to provide a rope pulley.
[0006] To achieve the above-mentioned technical objectives and effects, this utility model is implemented through the following technical solution:
[0007] A rope reel for winding a rope includes an annular rim, with a protruding first rim and a second rim on the outer side of the rim. A first conical surface is provided on the side of the first rim facing the second rim, and the first conical surface has first protrusions and first grooves arranged alternately along the circumference of the first conical surface. A second conical surface is provided on the side of the second rim facing the first rim, and the second conical surface has second protrusions and second grooves arranged alternately along the circumference of the second conical surface. Each first protrusion is arranged opposite to a second groove, and each second protrusion is arranged opposite to a first groove.
[0008] The first protrusion, the first groove, the second protrusion, and the second groove are all shaped like chrysanthemum petals.
[0009] The surfaces of the first protrusion, the first groove, the second protrusion, and the second groove are all smooth curved surfaces.
[0010] Preferably, the edges of the first protrusion, the edges of the first groove, and the junctions of the first conical surface are rounded, and the edges of the second protrusion, the edges of the second groove, and the junctions of the second conical surface are also rounded.
[0011] Wherein, the angle between the generatrix of the first conical surface and the central axis of the wheel rim is 60~70°, and the angle between the generatrix of the second conical surface and the central axis of the wheel rim is 60~70°.
[0012] As a preferred embodiment, the angle between the generatrix of the first conical surface and the central axis of the wheel rim is 67.5°, and the angle between the generatrix of the second conical surface and the central axis of the wheel rim is 67.5°.
[0013] Preferably, the outer center of the wheel rim is provided with a groove with a minor arc-shaped cross-section.
[0014] Preferably, a third cone surface is provided on the outer side of the wheel rim between the groove and the first cone surface, and the angle between the generatrix of the third cone surface and the central axis of the wheel rim is 22°; a fourth cone surface is provided on the outer side of the wheel rim between the groove and the second cone surface, and the angle between the generatrix of the fourth cone surface and the central axis of the wheel rim is 22°.
[0015] The wheel rim has a flat hole at its center for inserting the flat head of the rope wheel's axle.
[0016] The inner side of the wheel rim is provided with a limit ring, and the center of the limit ring is provided with a conical hole.
[0017] The beneficial effects of this utility model are as follows: the rope is wound on the rope wheel, and the rope is clamped by the cooperation of the first protrusion and the second groove, and the rope is clamped by the cooperation of the second protrusion and the first groove. The first protrusion and the first groove are arranged alternately, so that the rope wound on the rope wheel is wavy, which increases the friction between the rope wheel and the rope, improves the rope wheel's ability to grip the rope, and prevents slippage between the rope wheel and the rope. The rope has surface contact with the first protrusion, the first groove, the second protrusion, and the second groove, which prevents the rope from being cut and reduces the wear of the rope and the rope wheel. Attached Figure Description
[0018] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:
[0019] Figure 1 This is a schematic diagram of the rope pulley in this utility model as viewed from the front top;
[0020] Figure 2 This is a schematic diagram of the rope pulley in this utility model, viewed from the rear top.
[0021] Figure 3 This is a side view of the rope pulley structure in this utility model;
[0022] Figure 4 yes Figure 3 Schematic diagram of the structure in the AA direction;
[0023] Figure 5 yes Figure 3 Schematic diagram of the structure in the middle BB direction;
[0024] Figure 6 This is a front view structural diagram of the rope pulley in this utility model;
[0025] Figure 7 This is a rear view structural schematic diagram of the rope pulley in this utility model;
[0026] Figure 8 yes Figure 7 Schematic diagram of the CC-axis structure;
[0027] The following are the labels in the diagram: rim 1, groove 11, third cone surface 12, fourth cone surface 13, flat hole 14, first rim 2, first cone surface 21, first protrusion 22, first groove 23, second rim 3, second cone surface 31, second protrusion 32, second groove 33, limiting ring 4, cone hole 41. Detailed Implementation
[0028] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0029] like Figures 1 to 8 As shown, a rope reel is used for winding a rope. The rope reel includes an annular rim 1. The outer side of the rim 1 is provided with a protruding first rim 2 and a second rim 3. The side of the first rim 2 facing the second rim 3 is provided with a first conical surface 21. The first conical surface 21 is provided with first protrusions 22 and first grooves 23 arranged alternately around the circumference of the first conical surface 21. The side of the second rim 3 facing the first rim 2 is provided with a second conical surface 31. The second conical surface 31 is provided with second protrusions 32 and second grooves 33 arranged alternately around the circumference of the second conical surface 31. Each first protrusion 22 is arranged opposite to a second groove 33, and each second protrusion 32 is arranged opposite to a first groove 33.
[0030] The rope is wound around the rope reel, and is clamped by the first protrusion 22 and the second groove 33, and by the second protrusion 32 and the first groove 23. The first protrusion 22 and the first groove 33 are arranged alternately, so that the rope wound around the rope reel is wavy, which increases the friction between the rope reel and the rope, improves the rope reel's ability to grip the rope, and prevents slippage between the rope reel and the rope. The rope has surface contact with the first protrusion 22, the first groove 23, the second protrusion 32, and the second groove 33, which prevents the rope from being cut and reduces wear on the rope and the rope reel.
[0031] The first protrusion 22, the first groove 23, the second protrusion 32, and the second groove 33 are all chrysanthemum petal-shaped. The surfaces of the first protrusion 22, the first groove 23, the second protrusion 32, and the second groove 33 are all smooth curved surfaces. The edges of the first protrusion 22 and the first groove 23, and their junctions with the first conical surface 21 are rounded. Similarly, the edges of the second protrusion 32 and the second groove 33, and their junctions with the second conical surface 31 are rounded. This ensures that the surfaces of the parts where the rope pulley contacts the rope are smooth and rounded, preventing the rope from being cut or worn during winding.
[0032] like Figure 3 and Figure 8 As shown, the angle between the generatrix of the first conical surface 21 and the central axis of the rim 1 is 67.5°, and the angle between the generatrix of the second conical surface 31 and the central axis of the rim 1 is 67.5°. This ensures that the rope can smoothly enter between the first conical surface 21 and the second conical surface 31.
[0033] Apart from the angle dimensions used in this embodiment, the angle between the generatrix of the first conical surface 21 and the central axis of the rim 1 can be in the range of 60~70°, and the angle between the generatrix of the second conical surface 31 and the central axis of the rim 1 can also be in the range of 60~70°.
[0034] A groove 11 with a minor arc-shaped cross-section is provided in the middle of the outer side of the wheel rim 1. The surface of the groove 11 is arc-shaped to increase the contact area between the rope and the outer side of the wheel rim 1, thereby increasing the friction between the rope wheel and the rope.
[0035] like Figure 1 , Figure 2 , Figure 3 , Figure 8 As shown, a third cone surface 12 is provided on the outer side of the rim 1 between the groove and the first cone surface 21, and the angle between the generatrix of the third cone surface 12 and the central axis of the rim 1 is 22°. A fourth cone surface 13 is provided on the outer side of the rim 1 between the groove 11 and the second cone surface 31, and the angle between the generatrix of the fourth cone surface 13 and the central axis of the rim 1 is 22°. The provision of the third cone surface 12 and the fourth cone surface 13 also increases the contact area between the rope and the outer side of the rim 1, thereby increasing the friction between the rope pulley and the rope.
[0036] like Figure 7 , Figure 8 As shown, the center of the wheel rim 1 is provided with a flat hole 14 for the flat head of the rope wheel axle to be inserted. When the rope wheel is installed on the axle of the descent device, the flat head of the axle is inserted into the flat hole 14 in the center of the wheel rim 1. The flat hole 14 and the flat head of the rope wheel axle are engaged to keep them relatively fixed in the circumferential direction. That is, when the rope wheel is installed on the axle, the rope wheel rotates together with the axle.
[0037] like Figure 7 , Figure 8 As shown, a limiting ring 4 is provided on the inner side of the wheel rim 1. A conical hole 41 is provided in the center of the limiting ring 4. The conical hole 41 can accommodate the head of the countersunk screw connecting the rope wheel and the wheel axle, so as to prevent the head of the countersunk screw from protruding outside the rope wheel.
[0038] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0039] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.
Claims
1. A rope reel for winding rope, characterized in that: The rope pulley includes an annular rim, with a protruding first rim and a second rim on the outer side. The first rim has a first conical surface facing the second rim, and the first conical surface has first protrusions and first grooves arranged alternately along the circumference of the first conical surface. The second rim has a second conical surface facing the first rim, and the second conical surface has second protrusions and second grooves arranged alternately along the circumference of the second conical surface. Each first protrusion is arranged opposite to a second groove, and each second protrusion is arranged opposite to a first groove.
2. The rope pulley according to claim 1, characterized in that: The first protrusion, the first groove, the second protrusion, and the second groove are all shaped like chrysanthemum petals.
3. The rope pulley according to claim 1, characterized in that: The surfaces of the first protrusion, the first groove, the second protrusion, and the second groove are all smooth curved surfaces.
4. The rope pulley according to claim 1, characterized in that: The edges of the first protrusion, the edges of the first groove, and the junction of the first conical surface are rounded, as are the edges of the second protrusion, the edges of the second groove, and the junction of the second conical surface.
5. The rope pulley according to claim 1, characterized in that: The angle between the generatrix of the first conical surface and the central axis of the wheel rim is 60~70°, and the angle between the generatrix of the second conical surface and the central axis of the wheel rim is 60~70°.
6. The rope pulley according to claim 5, characterized in that: The angle between the generatrix of the first conical surface and the central axis of the wheel rim is 67.5°, and the angle between the generatrix of the second conical surface and the central axis of the wheel rim is 67.5°.
7. The rope pulley according to claim 1, characterized in that: The outer center of the wheel rim is provided with a groove with a minor arc-shaped cross-section.
8. The rope pulley according to claim 7, characterized in that: A third cone surface is provided on the outer side of the wheel rim between the groove and the first cone surface, and the angle between the generatrix of the third cone surface and the central axis of the wheel rim is 22°; a fourth cone surface is provided on the outer side of the wheel rim between the groove and the second cone surface, and the angle between the generatrix of the fourth cone surface and the central axis of the wheel rim is 22°.
9. The rope pulley according to claim 1, characterized in that: The center of the wheel rim is provided with a flat hole for the flat head of the rope wheel axle to be inserted.
10. The rope pulley according to claim 1, characterized in that: A limiting ring is provided on the inner side of the wheel rim, and a tapered hole is provided at the center of the limiting ring.