Automatic steel cable winding and unwinding mechanism

Abstract

The invention discloses an automatic steel cable winding and unwinding mechanism, and belongs to the technical field of hanging and lifting mechanisms and the like. The automatic steel cable winding and unwinding mechanism comprises a driving shaft, a horizontal winding shaft and a slipping clutch system; the driving shaft and the horizontal winding shaft are arranged in parallel, and the ends of the driving shaft and the horizontal winding shaft are jointly connected with a sliding block. A tensioning pulley and a pressing wheel are arranged in the sliding block. The slip clutch system can automatically disconnect a transmission line to play a role in protecting the product structure; the tensioning pulley and the pressing wheel are arranged to press the steel cable, so that static friction force exists between the steel cable and the tensioning pulley. When the tensioning pulley rotates clockwise, static friction force is changed into sliding friction force and is tension in the direction far away from the drum wheel, namely tension is generated on the steel cable, so that the steel cable is in a tensioning state when being wound in and out, and the steel cable can be easily wound out when being not loaded. The lifting mechanism solves the problem that a steel cable of an existing lifting mechanism cannot straighten the rolled-out steel cable and move downwards only by means of the self weight of a connector, and thus some use scenes cannot be met.

Description

Technical Field

[0001] The invention relates to the technical fields of hanging and lifting mechanisms, and in particular to an autonomous steel cable retracting and releasing mechanism. Background Art

[0002] The lifting mechanism is installed and fixed on the aircraft and is used to lift and lower a certain weight load. The lifting mechanism generally has a hook connected to one end of the steel cable for connecting the weight. The running track of the steel cable is either vertically downward or passes through several pulleys and then vertically downward. However, the weight of the hook connected to the steel cable is enough to straighten the steel cable of the winding device so that the steel cable can be better wound out when no heavy objects are mounted.

[0003] However, for some usage scenarios, the weight of the interface where the steel cable is connected to the heavy object is relatively small, and is not enough for the steel cable to be straightened and move downward by the weight of the interface alone. At the same time, the steel cable is also required to be arranged in an orderly manner on the winding device during the winding in / out process and not to be tangled. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides an autonomous retractable steel cable mechanism, which solves the problem in the prior art that the steel cable cannot be straightened and moved downward by the deadweight of the interface alone, and cannot meet some usage scenarios.

[0005] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is:

[0006] Provided is a steel cable autonomous retraction and release mechanism, which comprises a driving shaft, a horizontal winding shaft and a slip clutch system; the driving shaft and the horizontal winding shaft are arranged in parallel and their ends are commonly connected to a slider assembly, the slider assembly comprises a slider, the slider is threadedly connected to the end of the horizontal winding shaft, and the slider is slidably connected to the end of the driving shaft; a tensioning pulley and a pressure wheel assembly are arranged in the slider, one end of the driving shaft passes through the slider and is coaxially slidably connected to the tensioning pulley; the pressure wheel assembly comprises a pressure wheel arranged on the top of the tensioning pulley and an adjusting member for adjusting the position of the pressure wheel, and mounting grooves for mounting the steel cable are arranged on the circumferential outer walls of the tensioning pulley and the pressure wheel; the slip clutch system is connected to the driving gear to drive the driving shaft and the horizontal winding shaft to rotate in the same direction.

[0007] The basic principle of a self-retracting and retracting mechanism of a steel cable in this scheme is as follows: when in use, the steel cable needs to be placed on the mounting grooves of the tensioning pulley and the pressure wheel, and the pressure wheel is used to press the steel cable through the adjusting member. The steel cable is pressed by the tensioning pulley and the pressure wheel, so that there is static friction between the steel cable and the tensioning pulley. When the tensioning pulley rotates clockwise, the static friction will become sliding friction, and it is a pulling force away from the drum, that is, a tension is generated on the steel cable. Therefore, as long as the linear velocity V1 of the tensioning pulley and the steel cable velocity V0 meet the following conditions, the tension of the steel cable will always exist. When the steel cable is rolled out from the drum, the clockwise V1 is greater than V0; when the steel cable is rolled into the drum, the counterclockwise V1 is less than V0, and a pulling force is applied to the steel cable in the rolling-out direction, so that the steel cable is in a tensioned state when rolling in and out, ensuring that the steel cable can be easily rolled out when there is no load. The problem that the existing lifting mechanism cannot straighten the wound steel cable and move it downward by the deadweight of the interface alone and cannot meet some usage scenarios is solved. At the same time, when the horizontal winding shaft rotates, the slider and the steel wire inside it are driven to move along the axial direction of the horizontal winding shaft, ensuring that the steel cable is evenly arranged on the drum.

[0008] Furthermore, the pressure wheel is rotatably connected to the slider via a rotating shaft, and both ends of the rotating shaft cooperate with the slider via vertical strip mounting grooves; the adjusting member includes a pressure plate located inside the slider and located on the top of the pressure wheel, a connecting bolt is arranged on the top of the pressure plate, the top of the connecting bolt passes through the slider and is located outside it, a locking nut is threadedly connected to the top of the connecting bolt, and a fixed torsion spring is arranged between the locking nut and the outer top surface of the slider.

[0009] It is necessary to always maintain a certain value of cable tension on the steel cable. The cable tension is the sliding friction between the tensioning pulley and the steel cable when it rotates. The factor affecting the friction is the pressure provided by the clamping wheel, that is, the pressure of the locking nut compressing the fixed torsion spring. The fixed torsion spring can be a butterfly spring.

[0010] Furthermore, a spiral groove is provided at one end of the horizontal winding shaft along its length direction, and the end of the horizontal winding shaft is threadedly connected to the slider through the spiral groove.

[0011] Furthermore, as a specific setting method in which one end of the driving shaft passes through the slider and is coaxially slidably connected with the tensioning pulley, the driving shaft is provided with a keyway of a long strip structure along its length direction, and a connecting key that slides with the keyway is fixedly provided on the inner ring of the tensioning pulley.

[0012] Furthermore, a guide mechanism is provided on one side of the slider, and the guide mechanism includes a fixed rod arranged parallel to the driving shaft, a guide pulley moving along its axis direction is slidably provided on the fixed rod, a guide shaft is provided on the top of the guide pulley, and the steel cable is located between the guide shaft and the guide pulley. The guide mechanism can be arranged at the position where the steel cable makes a 90-degree turn, and the guide mechanism is used to guide the steel cable and minimize the friction generated when the steel cable turns.

[0013] Preferably, a cylindrical spring is provided on both sides of the guide pulley, each cylindrical spring is sleeved on the fixed rod, one end of the cylindrical spring contacts the end of the fixed rod, and the other end contacts the side of the guide pulley. This ensures that the steel cable can translate synchronously with the slider along the axial direction, and considering that the steel cable is not in a straight state when it is rolled out from the drum, the guide pulley can be supported by a bearing, and two cylindrical springs are added on both sides of the guide pulley to prevent the guide pulley from translating too fast.

[0014] When the entire lifting mechanism is working, the steel cable is wound on the drum while moving horizontally along its spiral groove as the slider rotates on the horizontal winding shaft and sliding synchronously on the driving shaft. At the same time, the wound steel cable drives the guide pulley to translate by relying on the residual horizontal force in the winding direction on the drum spiral groove.

[0015] Further, the slip clutch system includes a transmission shaft, a transition gear, a power gear, a first sprocket and a second sprocket;

[0016] The transmission shaft is provided with a transmission gear and a slipping mechanism, the transmission gear meshes with the driving gear and drives the transmission shaft to rotate; the slipping mechanism includes a friction disk connected to the transmission shaft, a butterfly spring for pushing the friction disk is provided on one side of the friction disk, and a third sprocket is provided on the friction disk;

[0017] The power gear is fixedly connected to the horizontal winding shaft and meshes with the driving gear through the transition gear; the first sprocket and the second sprocket are respectively arranged on the horizontal winding shaft and the driving shaft;

[0018] The third sprocket, the first sprocket and the second sprocket are matched with each other through chain transmission.

[0019] Considering the change in the diameter of the steel cable, the performance difference of each torsion spring, the processing tolerance of the thread and other factors, the tightening torque value of the locking nut is within a range. When the tightening torque value of the locking nut exceeds this range, the friction resistance increases, and the force transmitted to the tension pulley by the transmission route may be less than the friction resistance between the tension pulley and the steel cable, resulting in the tension pulley being temporarily unable to rotate. At this time, if the transmission route cannot be disconnected immediately, the parts on the transmission route will be damaged and the steel cable cannot be rolled out. In order to avoid the above situation, a slip mechanism is set on the transmission shaft, and the friction disc and the third sprocket are pressed by a butterfly spring so that there is a static friction force f between the two. When the force F transmitted to the third sprocket by the drive gear through the transmission shaft and the transmission gear is less than the static friction force f, the friction disc and the third sprocket drive the chain to drive the drive shaft together. When F is greater than f, the friction disc and the third sprocket slip, the friction disc rotates but the large sprocket does not rotate, and then the drive shaft cannot be driven to rotate through the chain, that is, the tension pulley does not rotate, which plays a role in protecting the product structure.

[0020] The beneficial effects of the present invention are as follows: 1. The self-retracting and releasing mechanism of the steel cable in the present invention presses the steel cable by setting a tension pulley and a pressure wheel, so that there is static friction between the steel cable and the tension pulley. When the tension pulley rotates clockwise, the static friction will become a sliding friction, and it is a pulling force away from the drum wheel, that is, a tension is generated on the steel cable, so that the steel cable is in a tensioned state when winding in and out, ensuring that the steel cable can be easily wound out even when no load is hung. It solves the problem that the lifting mechanism in the prior art cannot straighten the wound steel cable and move it downward by the deadweight of the interface alone, and cannot meet some usage scenarios.

[0021] 2. The present invention provides an autonomous cable retracting and releasing mechanism, which drives the slider and the steel wire inside it to move in the axial direction of the horizontal winding shaft by setting a horizontal winding shaft, thereby ensuring that the steel cable is evenly arranged on the drum wheel.

[0022] 3. The self-retracting and retracting mechanism of the steel cable in the present invention can automatically disconnect the transmission route by setting a slip clutch system, thereby protecting the product structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the three-dimensional structure of a steel cable autonomous retractable mechanism Figure 1 .

[0024] Figure 2 A schematic diagram of the three-dimensional structure of a steel cable autonomous retractable mechanism Figure 2 .

[0025] Figure 3 It is a structural diagram of the sliding mechanism.

[0026] Among them, 1. driving shaft; 2. horizontal winding shaft; 3. slider; 4. tensioning pulley; 5. clamping wheel; 6. steel cable; 7. clamping plate; 8. connecting bolt; 9. locking nut; 10. torsion spring; 11. spiral groove; 12. keyway; 13. fixing rod; 14. guide pulley; 15. guide shaft; 16. transmission shaft; 17. transition gear; 18. power gear; 19. first sprocket; 20. second sprocket; 21. transmission gear; 22. friction disc; 23. butterfly spring; 24. third sprocket; 25. cylindrical spring; 26. driving gear. DETAILED DESCRIPTION

[0027] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0028] like Figure 1-2 As shown, the present invention provides an autonomous steel cable retraction and extension mechanism, which includes a driving shaft 1, a horizontal winding shaft 2 and a slip clutch system; the driving shaft 1 and the horizontal winding shaft 2 are arranged in parallel and the ends of the two are commonly connected to a slider 3 assembly, the slider 3 assembly includes a slider 3, the slider 3 is threadedly connected to the end of the horizontal winding shaft 2, specifically, one end of the horizontal winding shaft 2 is provided with a spiral groove 11 along its length direction, and the end of the horizontal winding shaft 2 is threadedly connected to the slider 3 through the spiral groove 11.

[0029] The slider 3 is slidably connected to the end of the driving shaft 1; a tensioning pulley 4 and a pressure wheel assembly are arranged inside the slider 3, and one end of the driving shaft 1 passes through the slider 3 and is coaxially slidably connected to the tensioning pulley 4; specifically, the driving shaft 1 is provided with a keyway 12 of a long strip structure along its length direction, and a connecting key that slides with the keyway 12 is fixedly arranged on the inner ring of the tensioning pulley 4.

[0030] The pressure wheel assembly includes a pressure wheel 5 arranged on the top of the tensioning pulley 4 and an adjusting part for adjusting the position of the pressure wheel 5. The circumferential outer walls of the tensioning pulley 4 and the pressure wheel 5 are provided with installation grooves for installing the steel cable 6; the slip clutch system is connected to the driving gear 26 for driving the driving shaft 1 and the horizontal winding shaft 2 to rotate in the same direction.

[0031] The basic principle of a self-retracting and retracting mechanism of a steel cable in this scheme is as follows: when in use, the steel cable 6 needs to be placed on the mounting grooves of the tension pulley 4 and the pressure wheel 5, and the pressure wheel 5 is used to press the steel cable 6 through the adjusting member, and the steel cable 6 is pressed by the tension pulley 4 and the pressure wheel 5, so that there is static friction between the steel cable 6 and the tension pulley 4. When the tension pulley 4 rotates clockwise, the static friction will become a sliding friction, and it is a pulling force away from the drum direction, that is, a tension is generated on the steel cable 6. Therefore, as long as the linear velocity V1 of the tension pulley 4 and the speed V0 of the steel cable 6 meet the following conditions, the tension of the steel cable 6 will always exist. When the steel cable 6 is rolled out from the drum, the clockwise V1 is greater than V0; when the steel cable 6 is rolled into the drum, the counterclockwise V1 is less than V0, and a pulling force is applied to the steel cable 6 in the rolling-out direction of the steel cable 6, so that the steel cable 6 is in a tensioned state when rolling in and out, ensuring that the steel cable 6 can be easily rolled out when there is no load. The problem that the existing lifting mechanism cannot straighten the wound steel cable 6 and move it downward by the deadweight of the interface alone and cannot meet some usage scenarios is solved. Specifically, the usage scenario is that two lifting mechanisms often need to be wound in / out at the same time without load. Because of the application of the tensioning system, the steel cable 6 can be wound in / out autonomously under no-load conditions, and two people are no longer required to hold the steel cable 6 under the lifting mechanism, thus freeing up human resources. At the same time, when the horizontal winding shaft 2 rotates, the slider 3 and the steel wire inside it are driven to move along the axial direction of the horizontal winding shaft 2, ensuring that the steel cable 6 is evenly arranged on the drum.

[0032] Specifically, the pressure wheel 5 is rotatably connected to the slider 3 through a rotating shaft, and both ends of the rotating shaft cooperate with the slider 3 through vertical strip mounting grooves; the adjusting part includes a pressure plate 7 located inside the slider 3 and at the top of the pressure wheel 5, and a connecting bolt 8 is arranged on the top of the pressure plate 7, and the top of the connecting bolt 8 passes through the slider 3 and is located outside it, and a locking nut 9 is threadedly connected to the top of the connecting bolt 8, and a fixed torsion spring 10 is arranged between the locking nut 9 and the outer top surface of the slider 3.

[0033] It is necessary to always maintain a certain value of tension in the steel cable 6, and the tension in the steel cable 6 is the sliding friction between the tensioning pulley 4 and the steel cable 6 when the tensioning pulley 4 rotates. The factor affecting the friction is the pressure provided by the clamping wheel 5, that is, the pressure of the locking nut 9 pressing the fixed torsion spring 10. The fixed torsion spring 10 can be made of elastic elements such as butterfly springs.

[0034] Preferably, but not limited to, a guide mechanism is further provided on one side of the slider 3, and the guide mechanism includes a fixed rod 13 arranged parallel to the driving shaft 1, a guide pulley 14 moving along its axial direction is slidably provided on the fixed rod 13, a guide shaft 15 is provided on the top of the guide pulley 14, and the steel cable 6 is located between the guide shaft 15 and the guide pulley 14. The guide mechanism can be arranged at the position where the steel cable 6 makes a 90-degree turn, and the guide mechanism is used to guide the steel cable 6 and minimize the friction generated when the steel cable 6 turns.

[0035] A cylindrical spring 25 is provided on both sides of the guide pulley 14, and each cylindrical spring 25 is sleeved on the fixed rod 13, one end of the cylindrical spring 25 contacts the end of the fixed rod 13, and the other end contacts the side of the guide pulley 14. It is ensured that the steel cable 6 can be synchronously translated along the axial direction with the slider 3, and considering that the steel cable 6 is not in a straight state when it is rolled out from the drum, the guide pulley 14 can be supported by a bearing, and two cylindrical springs 25 are added on both sides of the guide pulley 14 to prevent the guide pulley 14 from translating too fast.

[0036] When the entire lifting mechanism is working, the steel cable 6 is wound on the drum while moving horizontally along its spiral groove 11 as the slider 3 rotates on the horizontal winding shaft 2 and sliding synchronously on the driving shaft 1. At the same time, the wound steel cable 6 drives the guide pulley 14 to translate by relying on the residual horizontal force in the winding direction on the drum spiral groove.

[0037] Furthermore, if Figure 1 to Figure 3 As shown, the slip clutch system includes a transmission shaft 16, a transition gear 17, a power gear 18, a first sprocket 19 and a second sprocket 20;

[0038] The transmission shaft 16 is provided with a transmission gear 21 and a slip mechanism, the transmission gear 21 meshes with the driving gear 26 and drives the transmission shaft 16 to rotate; the slip mechanism includes a friction disc 22 connected to the transmission shaft 16, a butterfly spring 23 for pushing the friction disc 22 is provided on one side of the friction disc 22, and a third sprocket 24 is provided on the friction disc 22;

[0039] The power gear 18 is fixedly connected to the horizontal winding shaft 2 and meshes with the driving gear 26 through the transition gear 17; the first sprocket 19 and the second sprocket 20 are respectively arranged on the horizontal winding shaft 2 and the driving shaft 1;

[0040] The third sprocket 24, the first sprocket 19 and the second sprocket 20 are coupled together through chain transmission.

[0041] Considering the change in the diameter of the steel cable 6, the performance difference of each torsion spring 10, the processing tolerance of the thread, etc., the tightening torque value of the locking nut 9 is within a range. When the tightening torque value of the locking nut 9 exceeds this range, the friction resistance increases, and the force transmitted to the tension pulley 4 by the transmission route may be less than the friction resistance between the tension pulley 4 and the steel cable 6, resulting in the tension pulley 4 temporarily unable to rotate. At this time, if the transmission route cannot be disconnected immediately, it will cause damage to the parts on the transmission route and the steel cable 6 cannot be rolled out. In order to avoid the above situation, a slip mechanism is set on the transmission shaft 16, and the butterfly spring 23 is used to press the friction disk 22 and the third sprocket 24, so that there is a static friction force f between the two. When the force F transmitted to the third sprocket 24 by the driving gear 26 through the transmission shaft 16 and the transmission gear 21 is less than the static friction force f, the friction disk 22 and the third sprocket 24 drive the chain to drive the driving shaft 1 together. When F is greater than f, the friction disc 22 and the third sprocket 24 slip, the friction disc 22 rotates but the large sprocket does not rotate, and the drive shaft 1 cannot be driven to rotate through the chain, that is, the tensioning pulley 4 does not rotate, which plays a role in protecting the product structure.

[0042] In summary, a steel cable autonomous retracting and releasing mechanism in the present invention, by setting a tensioning pulley 4 and a pressure wheel 5 to press the steel cable 6, causes static friction to exist between the steel cable 6 and the tensioning pulley 4. When the tensioning pulley 4 rotates clockwise, the static friction will become a sliding friction, and it is a pulling force away from the drum, that is, a tension is generated on the steel cable 6, so that the steel cable 6 is in a tensioned state when winding in and out, ensuring that the steel cable 6 can be easily wound out even without a load. The problem that the steel cable 6 in the lifting mechanism in the prior art cannot be straightened and moved downward by the deadweight of the interface alone and cannot meet some usage scenarios is solved. By setting a horizontal winding shaft 2, the slider 3 and the steel wire inside it are driven to move along the axial direction of the horizontal winding shaft 2, ensuring that the steel cable 6 is evenly arranged on the drum. By setting a slip clutch system, the transmission route can be automatically disconnected, which plays a role in protecting the product structure.

Claims

1. A steel cable autonomous retracting and releasing mechanism, characterized in that: It includes a driving shaft, a horizontal winding shaft and a slip clutch system; the driving shaft and the horizontal winding shaft are arranged in parallel and the ends of the two are commonly connected with a slider assembly, the slider assembly includes a slider, the slider is threadedly connected to the end of the horizontal winding shaft, and the slider is slidably connected to the end of the driving shaft; a tensioning pulley and a pressure wheel assembly are arranged in the slider, one end of the driving shaft passes through the slider and is coaxially slidably connected to the tensioning pulley; the pressure wheel assembly includes a pressure wheel arranged on the top of the tensioning pulley and an adjusting part for adjusting the position of the pressure wheel, and the circumferential outer walls of the tensioning pulley and the pressure wheel are both provided with mounting grooves for installing steel cables; the slip clutch system is connected to the driving gear to drive the driving shaft and the horizontal winding shaft to rotate in the same direction.

2. The steel cable autonomous retracting and releasing mechanism according to claim 1, characterized in that: The pressure wheel is rotatably connected to the slider via a rotating shaft, and both ends of the rotating shaft cooperate with the slider via vertical strip mounting grooves; the adjusting member includes a pressure plate located inside the slider and at the top of the pressure wheel, a connecting bolt is provided on the top of the pressure plate, the top of the connecting bolt passes through the slider and is located outside the slider, a locking nut is threadedly connected to the top of the connecting bolt, and a fixed torsion spring is provided between the locking nut and the outer top surface of the slider.

3. The steel cable autonomous retracting and releasing mechanism according to claim 2, characterized in that: One end of the horizontal winding shaft is provided with a spiral groove along its length direction, and the end of the horizontal winding shaft is threadedly connected with the slider through the spiral groove.

4. The steel cable autonomous retracting and releasing mechanism according to claim 3, characterized in that: The driving shaft is provided with a keyway of a long strip structure along its length direction, and a connecting key which is slidably matched with the keyway is fixedly provided on the inner ring of the tensioning pulley.

5. The steel cable autonomous retracting and releasing mechanism according to claim 3, characterized in that: A guide mechanism is also provided on one side of the slider, and the guide mechanism includes a fixed rod arranged parallel to the driving shaft, a guide pulley moving along its axial direction is slidably provided on the fixed rod, a guide shaft is provided on the top of the guide pulley, and a steel cable is located between the guide shaft and the guide pulley.

6. The steel cable autonomous retracting and releasing mechanism according to claim 5, characterized in that: The slip clutch system includes a transmission shaft, a transition gear, a power gear, a first sprocket and a second sprocket; The transmission shaft is provided with a transmission gear and a slip mechanism, the transmission gear meshes with the drive gear and drives the transmission shaft to rotate; the slip mechanism comprises a friction disk connected to the transmission shaft, a butterfly spring for pushing the friction disk is provided on one side of the friction disk, and a third sprocket is provided on the friction disk; The power gear is fixedly connected to the horizontal winding shaft and meshes with the driving gear through the transition gear; the first sprocket and the second sprocket are respectively arranged on the horizontal winding shaft and the driving shaft; The third sprocket, the first sprocket and the second sprocket are matched with each other through chain transmission.

7. The wire rope autonomous retracting and releasing mechanism according to claim 6, characterized in that: A cylindrical spring is arranged on both sides of the guide pulley, and each of the cylindrical springs is sleeved on the fixing rod. One end of the cylindrical spring contacts the end of the fixing rod, and the other end contacts the side surface of the guide pulley.

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