Pulley structure for preventing friction of steel wire rope

Abstract

This application pertains to the application of loads to guide pulleys in full-scale aircraft fatigue testing, and specifically relates to a pulley structure for preventing wire rope friction. It requires at least three coaxial pulleys, which are synchronized by locating pins. Each pulley groove has a locating hole to secure the end of the wire rope, ensuring no relative movement or friction between the wire rope and the pulley groove during pulley rotation. The three pulleys are arranged in two systems: the two side pulleys have their protruding wire ropes joined together via connecting plates, connecting to the loading point or loading actuator; the middle pulley's wire rope is connected to the other end. This ensures that no friction occurs between the wire rope and the pulleys during the test.

Description

Technical Field

[0001] This application pertains to the application of loads on guide pulleys for full-size aircraft fatigue testing, and particularly relates to a pulley structure for preventing friction of steel wire ropes. Background Technology

[0002] Fatigue testing is a crucial component of aircraft structural strength testing. In situations where the loading space is limited, loading devices such as actuators cannot be installed along the loading force line. This is typically addressed by using guide pulleys. However, during long-term fatigue testing, the persistent friction between the wire rope and the pulley can lead to wire rope breakage, potentially causing a major quality and safety incident. This poses a significant safety hazard in fatigue testing.

[0003] This invention provides a simple and efficient technical method to prevent friction between wire rope and pulley during fatigue testing. Summary of the Invention

[0004] To address the aforementioned problems, this application provides a pulley structure for preventing steel wire rope friction, comprising:

[0005] There are at least two types of pulleys, including a first pulley and a second pulley; the number of first pulleys is at least one, and the number of second pulleys is an integer multiple of 2;

[0006] The pulley shaft has a first pulley mounted on it and a second pulley mounted on both sides of the first pulley. Both the first and second pulleys have locating pin holes, and the locating pins pass through the locating pin holes of the first and second pulleys to make the first and second pulleys rotate together.

[0007] The cable includes a first cable and a second cable. The number of first cables is the same as the number of first pulleys. The end of each first cable is fixed to a first pulley. The number of second cables is the same as the number of second pulleys. The end of each second cable is fixed to a second pulley. The connecting ends of the first cables are all fixed to a first connecting plate, so that the first cable and the first pulley connected to it are on the same plane. The connecting ends of the second cables are all fixed to a second connecting plate, so that the second cable and the second pulley connected to it are on the same plane. Part of the first cable is wound around the first pulley, and the other part of the first cable extends in a first direction. Part of the second cable is wound around the second pulley, and the other part of the second cable extends in a second direction.

[0008] Preferably, the first direction and the second direction are perpendicular to each other.

[0009] Preferably, it also includes a third pulley, the number of which is an integer multiple of 2. The third pulley is installed on both sides of the first pulley or the second pulley. A third cable corresponding to the number of third pulleys is fixed and wound on the third pulley. The connection ends of the third cable are all fixed to the third connecting plate. Part of the third cable is wound on the third pulley, and the other part of the third cable extends in a third direction.

[0010] Preferably, the first direction, the second direction, and the third direction are different from each other.

[0011] Preferably, the first pulley and the second pulley have positioning holes for fixing cables.

[0012] Preferably, both the first cable and the second cable are made of steel wire rope.

[0013] Preferably, both the first pulley and the second pulley have grooves for accommodating the first cable and the second cable, and the width of the grooves is equal to the diameter of the first cable and the second cable.

[0014] Preferably, the first pulley winds half a circumference of the first cable, and the second pulley winds half a circumference of the second cable.

[0015] Preferably, the angular position of the end point of the second cable on the second pulley is 90 degrees different from the angular position of the end point of the first cable on the first pulley.

[0016] The advantages of this application include: a) ensuring precise loading of the guide pulley; b) ensuring no friction between the wire rope and the pulley, thus improving the service life of the wire rope; c) determining the pulley radius based on the test loading stroke; d) simple loading components and convenient installation; e) simple design principle, applicable to most guide pulley loading methods, and strong versatility; f) preventing friction between the wire rope and the pulley; g) low processing requirements and low testing costs; h) simple installation and convenient test implementation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a pulley structure for preventing steel wire rope friction according to a preferred embodiment of this application;

[0018] Figure 2 This is a schematic diagram of the second pulley according to a preferred embodiment of this application;

[0019] Figure 3 This is a schematic diagram of the first pulley according to a preferred embodiment of this application. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0021] like Figure 1-3 As shown, in order to solve the above problems, this application provides a pulley structure for preventing steel wire rope friction, comprising:

[0022] At least two types of pulleys are provided, including a first pulley 1 and a second pulley 2; in this embodiment, there is one first pulley 1 and two second pulleys 2.

[0023] The pulley shaft 6 has a first pulley 1 mounted on it and a second pulley 2 mounted on both sides of the first pulley 1. Both the first pulley 1 and the second pulley 2 have a positioning pin 7 hole. The positioning pin 7 passes through the positioning pin 7 hole of the first pulley 1 and the second pulley 2 to make the first pulley 1 and the second pulley 2 rotate together.

[0024] The cable, in this embodiment, is a steel wire rope to bear a large load, including a first cable 4 and a second cable 5. The end of the first cable 4 is fixed on the first pulley 1. The number of second cables 5 is the same as the number of second pulleys 2, which is two in total. The end of each second cable 5 is fixed on a second pulley 2. The connecting ends of the first cable 4 are all fixed on the first connecting plate 8, so that the first cable 4 and the first pulley 1 connected to it are on the same plane, and the load of the steel wire rope is a tensile load. The connecting ends of the second cables 5 are all fixed on the second connecting plate 8, so that the second cable 5 and the second pulley 2 connected to it are on the same plane. Part of the first cable 4 is wound around the first pulley 1, and the other part of the first cable 4 extends in a first direction. Part of the second cable 5 is wound around the second pulley 2, and the other part of the second cable 5 extends in a second direction.

[0025] In some alternative implementations, the first direction and the second direction are perpendicular to each other.

[0026] In some alternative embodiments, a third pulley (not shown in the figure) is also included. The number of third pulleys is an integer multiple of 2. The third pulleys are installed on both sides of the first pulley 1 or the second pulley 2. A third cable corresponding to the number of third pulleys is fixed and wound on the third pulley. The connection ends of the third cable are all fixed on the third connecting plate 8. Part of the third cable is wound on the third pulley, and the other part of the third cable extends in a third direction.

[0027] In some alternative implementations, the first direction, the second direction, and the third direction are different from each other.

[0028] In some alternative embodiments, the first pulley 1 and the second pulley 2 have positioning holes 3 for fixing cables.

[0029] In some alternative implementations, both the first cable 4 and the second cable 5 are made of steel wire rope.

[0030] In some alternative embodiments, both the first pulley 1 and the second pulley 2 have grooves for accommodating the first cable 4 and the second cable 5, and the width of the grooves is equal to the diameter of the first cable 4 and the second cable 5.

[0031] In some alternative implementations, the first pulley 1 winds half a circumference of the first cable 4, and the second pulley 2 winds half a circumference of the second cable 5.

[0032] In some alternative embodiments, the angular position of the end point of the second cable 5 on the second pulley 2 differs from that of the end point of the first cable 4 on the first pulley 1 by 90 degrees.

[0033] This application requires at least three coaxial pulleys, which are synchronized by locating pins. Each pulley groove has a locating hole to secure the end of the wire rope, ensuring no relative movement or friction between the wire rope and the pulley groove during pulley rotation. The three pulleys form two systems: the two side pulleys have their protruding wire ropes joined together by connecting plates, connecting to the loading part or loading actuator; the middle pulley's wire rope connects to the other end. This ensures that no friction occurs between the wire rope and the pulleys during the test. The complete set of guide pulley loading equipment meets the guiding loading requirements in fatigue testing. The anti-friction guide pulley loading equipment should meet the following conditions: a) ensures accurate loading of the guide pulley; b) ensures no friction between the wire rope and the pulley, improving the service life of the wire rope; c) the pulley radius is determined according to the test loading stroke; d) the loading components are simple and easy to install; e) the design principle is simple, applicable to most guide pulley loading methods, and has strong versatility; f) prevents friction between the wire rope and the pulley; g) low processing requirements and low testing costs; h) simple installation, facilitating test implementation.

[0034] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A pulley structure for preventing friction in steel wire ropes, characterized in that, include: At least two types of pulleys, including a first pulley (1) and a second pulley (2); the number of first pulleys (1) is at least one, and the number of second pulleys (2) is an integer multiple of 2; The pulley shaft (6) has a first pulley (1) mounted on it and a second pulley (2) mounted on both sides of the first pulley (1). Both the first pulley (1) and the second pulley (2) have a positioning pin (7) hole. The positioning pin (7) passes through the positioning pin (7) hole of the first pulley (1) and the second pulley (2) so that the first pulley (1) and the second pulley (2) rotate together. The cable includes a first cable (4) and a second cable (5). The number of first cables (4) is the same as the number of first pulleys (1). The end of each first cable (4) is fixed on a first pulley (1). The number of second cables (5) is the same as the number of second pulleys (2). The end of each second cable (5) is fixed on a second pulley (2). The connecting ends of the first cables (4) are all fixed on the first connecting plate (8), so that the first cable (4) and the first pulley (1) connected to it are on the same plane. The connecting ends of the second cables (5) are all fixed on the second connecting plate, so that the second cable (5) and the second pulley (2) connected to it are on the same plane. Part of the first cable (4) is wrapped around the first pulley (1), and the other part of the first cable (4) extends in the first direction. Part of the second cable (5) is wrapped around the second pulley (2), and the other part of the second cable (5) extends in the second direction.

2. The pulley structure for preventing steel wire rope friction as described in claim 1, characterized in that, The first direction and the second direction are perpendicular to each other.

3. The pulley structure for preventing steel wire rope friction as described in claim 1, characterized in that, It also includes a third pulley, the number of which is an integer multiple of 2. The third pulley is installed on both sides of the first pulley (1) or the second pulley (2). A third cable is fixed and wound on each third pulley. The number of the third cables is the same as the number of the third pulleys. The connection ends of the third cables are all fixed on the third connecting plate. Part of the third cable is wound on the third pulley, and the other part of the third cable extends in a third direction.

4. The pulley structure for preventing steel wire rope friction as described in claim 3, characterized in that, The first direction, the second direction, and the third direction are all different.

5. The pulley structure for preventing steel wire rope friction as described in claim 1, characterized in that, The first pulley (1) and the second pulley (2) have positioning holes (3) for fixing cables.

6. The pulley structure for preventing steel wire rope friction as described in claim 1, characterized in that, Both the first cable (4) and the second cable (5) are made of steel wire rope.

7. The pulley structure for preventing steel wire rope friction as described in claim 1, characterized in that, Both the first pulley (1) and the second pulley (2) have grooves to accommodate the first cable (4) and the second cable (5), and the width of the grooves is equal to the diameter of the first cable (4) and the second cable (5).

8. The pulley structure for preventing steel wire rope friction as described in claim 1, characterized in that, The first pulley (1) winds half a circumference of the first cable (4), and the second pulley (2) winds half a circumference of the second cable (5).

9. The pulley structure for preventing steel wire rope friction as described in claim 8, characterized in that, The angular position of the end point of the second cable (5) on the second pulley (2) differs by 90 degrees from the angular position of the end point of the first cable (4) on the first pulley (1).

Images