Axial tensioning device applied to winding rope of motor shaft

Abstract

The invention discloses an axial tensioning device applied to a motor shaft winding rope. The tensioning device is composed of a motor coupling device, a spring tensioning device and a fixing platform. And the motor coupling device is connected with the spring tensioning device through a spring. According to the motor coupling device, the rope is matched with the motor shaft and the spring, so that the traction control of the motor on the rope is realized, and the rope and the spring are connected. The spring tensioning mechanism controls the tension degree of the rope by adjusting the fixing rod and the limiting rod to control the elongation of the spring. By adjusting the height of the limiting rod, stable adjustment of the tension degree of the rope is achieved, and meanwhile large-range pre-adjustment of the tension force and small-range adjustment of the rope in movement are achieved. The tensioning mechanism is directly arranged in the axial direction of the motor, the tensioning force of the ropes can be flexibly adjusted in the axial position of the motor, the structure is simplified, the space utilization efficiency is improved, and tight arrangement of the multiple ropes is achieved.

Description

Technical Field

[0001] The invention relates to the field of wire rope tensioning design, and in particular to an axial tensioning device used for winding wire ropes around motor shafts. Background Art

[0002] The motor is a common driving source for driving the rope. The rope is wound around the motor, and the motor is driven to rotate to drive the rope to move, thereby driving the controlled device to move. The rope needs to be tensioned during use. The traditional rope tensioning mechanism is mainly classified into tensioning wheel tensioning mechanism, elastic connector tensioning mechanism, electromagnetic tensioning mechanism, hydraulic tensioning mechanism, etc. Among them, the traditional tensioning wheel tensioning mechanism and the elastic connector tensioning mechanism are respectively equipped with pulleys and springs on the rope. The rope tensioning mechanism is placed between the driving source and the controlled device. The rope length is adjusted by adjusting the position of the pulley and the spring to achieve the tensioning effect. This type of rope tensioning mechanism occupies a large space between the driving source and the controlled device, which is not friendly to the design of multiple ropes arranged closely. The electromagnetic tensioning mechanism and the hydraulic tensioning mechanism have complex structures and are difficult to be used in narrow spaces, and it is difficult to meet the tensioning requirements of small devices. At the same time, the tensioning force pre-adjustable range of the traditional small-volume rope tensioning mechanism is small, and it is difficult to automatically adjust the tensioning force during the movement of the rope. How to adjust the tension of multiple ropes over a large range in a small space is an important issue in the current tensioning mechanism design. At the same time, some traditional rope tensioning mechanisms in a small space are difficult to adjust the rope pre-tensioning force and the tensioning force during use at the same time. How to adjust these two tensioning forces at the same time in a small space is also a very important research issue.

[0003] The rope tensioning mechanism installed between the driving source and the controlled device greatly limits the spatial design of multiple ropes. The rope tensioning mechanism placed in the axial direction of the driving source is assembled with the driving source, which reduces the equipment installation between the driving source and the controlled device, and is conducive to the close arrangement of multiple ropes. There are few studies on axial rope tensioning mechanisms with motors as the driving source, and the research and application of small equipment is insufficient. At present, axial rope tensioning mechanisms are rarely used on motors in narrow spaces, and the tensioning force adjustment range is relatively small. How to increase the adjustment range of this type of tensioning mechanism while reducing the volume of the axial rope tensioning mechanism is an important issue in the design of the rope tensioning mechanism. In summary, the design of rope tensioning mechanisms applied to the axial direction of small equipment has high practical value. Summary of the invention

[0004] The present invention aims to address the deficiencies of the prior art and to provide an axial tensioning device for winding a wire rope around a motor shaft.

[0005] The objective of the present invention is achieved through the following technical solutions: an axial tensioning device for winding a wire rope around a motor shaft, the device comprising a motor coupling device and a spring tensioning device, as well as a lower platform and an upper platform. The motor coupling device and the spring tensioning device are connected by a spring, the lower platform is installed with the motor coupling device, the upper platform is installed with the spring tensioning device, and the upper and lower platforms are connected by a copper column;

[0006] The motor coupling device includes a motor and a motor coupling. The motor coupling is provided with a rope hole and an annular guide rail. The annular guide rail is divided into two circles, an upper circle and an lower circle. Two ropes are respectively wrapped around one circle and then passed through the rope hole and connected to each other in the middle of the motor coupling. The connected ropes are connected to the spring.

[0007] Further, the spring tensioning device includes a limiting rod, a fixing rod and a limiting device;

[0008] The limiting device is provided with a limiting hole, and the limiting rod passes through the limiting hole; the fixing rod is connected with the spring and is fixed on the limiting device through the limiting rod.

[0009] Furthermore, the limiting holes on the limiting device include seven groups for adjusting the positions of the limiting rod and the fixing rod.

[0010] Furthermore, the limiting rod uses a flat head screw with a thread, and the fixing rod uses a copper rod with a high friction coefficient and a patterned and concave-convex design on the surface, which increases the friction coefficient between the fixing rod and the limiting rod and avoids slippage between the fixing rod and the limiting rod.

[0011] Furthermore, the motor coupling is provided with two threaded holes, and the motor coupling and the motor shaft are connected by screws.

[0012] Furthermore, the upper platform is equipped with a plurality of spring tensioning devices, and the lower platform includes a plurality of motor coupling devices, and the number of the spring tensioning devices and the number of the motor coupling devices are the same.

[0013] Beneficial effects of the present invention:

[0014] First, the tensioning device of the present invention can adjust the tensioning force of the wire rope at the axial position of the motor, which solves the problem that the traditional wire rope tensioning mechanism occupies the space between the driving source and the controlled device, and realizes the close arrangement of multiple wire ropes in a small space.

[0015] Second: The tensioning device of the present invention can adjust the tensioning force in a large range, which solves the problem of insufficient tensioning force adjustment range of traditional rope tensioning mechanisms in narrow spaces and improves the adjustment ability of tensioning mechanisms in narrow spaces.

[0016] Third: The tensioning device of the present invention occupies a small space, which solves the problem that the axial tensioning device is difficult to implement in a narrow space and improves the space utilization efficiency.

[0017] Fourth: The tensioning device of the present invention simultaneously realizes a large-range pre-adjustment of the tensioning force and a small-range adjustment during the movement of the wire rope, thereby solving the problem that the tensioning force is difficult to adjust during the movement of the wire rope in a narrow space. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a simulation design diagram of an axial tensioning device for winding a wire rope around a motor shaft proposed by the present invention;

[0019] Figure 2 This is a physical picture of an axial tensioning device for winding a wire rope around a motor shaft proposed by the present invention;

[0020] Figure 3 This is a physical picture of an axial tensioning device for winding a wire rope around a motor shaft proposed by the present invention being applied to a line transmission dexterous hand. DETAILED DESCRIPTION

[0021] The specific implementation modes of the present invention are further described in detail below with reference to the accompanying drawings.

[0022] An embodiment of the present invention provides an axial tensioning device for winding a wire rope around a motor shaft, which is used to achieve a large-range pre-adjustment of the wire rope tensioning force in the axial direction of the motor in a narrow space and a small-range adjustment during the movement of the wire rope, thereby achieving a close arrangement of multiple wire ropes in a small space.

[0023] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention is clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Please refer to Figure 1 The present invention discloses an axial tensioning device for winding a wire rope around a motor shaft, which is used to control the tensioning force of the motor axis rope at an axial position, and includes a motor coupling device 14 and a spring tensioning device 15.

[0025] The motor coupling device 14 includes a motor 1 and a motor coupling 2. The motor coupling 2 has two threaded holes 16, and the motor coupling 2 and the motor shaft are connected by two screws 3. The motor coupling has a rope hole 4, an upper and lower annular guide rail 5 and a threaded hole 16. Two ropes 17 are respectively wrapped around the annular guide rail 5 and enter the rope hole 4, and are connected in the middle of the motor coupling 2. After the connection, the ropes 17 are connected to the spring 6. The motor coupling device 14 is fixed to the lower platform 11. The lower platform 11 is connected to the upper platform 13 through the copper column 12. The spring tensioning device 15 is fixed to the upper platform 13, including a limit rod 7, a fixing rod 8 and a limit device 9. The limit rod 7 is fixed by passing through the limit hole 10 on the limit device 9. There are seven groups of limit holes 10, and the position can be adjusted. The fixing rod 8 is placed above the limit rod 7 and connected to the spring 6.

[0026] In the above-mentioned wire rope tensioning device, the motor coupling is made of aluminum alloy material, and the limit device is made of 3D printing to reduce weight.

[0027] In this example, a method for tensioning the wire rope wrapped around the motor shaft is as follows:

[0028] The two wire ropes are respectively wound around the two annular guide rails 5, passed through the relative wire rope holes 4, and connected to each other inside the hollow motor coupling 2, thereby connecting the two wire ropes into one. The spring 6 passes through the connected wire rope and is connected to the fixed rod 8. The fixed rod 8 is placed above the limit rod 7, and the fixed rod 8 is positioned by the downward pulling force of the spring 6 and the friction force of the limit rod 7. The limit rod 7 is placed in the limit hole 10 on the limit device 9. There are seven groups of limit holes 10 that can adjust the position of the limit rod 7 and set the position of the limit rod 7. In this way, the position of the fixed rod 8 is fixed, the length of the spring 6 is set, and the pre-tensioning force is set.

[0029] The above-mentioned wire rope tensioning device can realize a large range of pre-adjustment of the wire rope tensioning force and a small range of adjustment during the movement of the wire rope. The large range of pre-adjustment of the wire rope tensioning force is realized by adjusting the corresponding positions of the limit rod 7 and the fixed rod 8 in the limit hole 10 in the limit device 9. By adjusting the corresponding positions of the limit rod 7 and the fixed rod 8 in the limit hole 10 in the limit device 9, the height of the limit rod 7 and the fixed rod 8 can be adjusted. The fixed rod 8 is connected to the spring 6, and the lower end of the spring 6 is connected to the wire rope, which can be regarded as a fixed height. The height of the upper end of the spring 6 can be adjusted by adjusting the height of the limit rod 7 and the fixed rod 8, thereby adjusting the length of the spring 6. Changes in the length of the spring 6 will result in changes in the pre-tensioning force. Since there are seven groups of limit holes 10 with different heights, the length of the spring 6 has 7 groups of different pre-adjustment values, thereby realizing a large range of adjustment of the pre-tensioning force.

[0030] The small-range adjustment of the tension during the movement of the rope is achieved through the elastic deformation of the spring itself during the movement. During the use of the rope, a certain elastic deformation may occur, which will cause a temporary change in the required spring tension. This design can make the spring deform to a certain extent according to the required tension. Since the upper end of the spring is fixed in position by the limit rod and the fixed rod, it can be regarded as a fixed height. The increase in the tension of the rope will drive the lower end of the spring to deform downward, thereby increasing the elongation of the spring and increasing the tension; when the tension of the rope decreases, the lower end of the spring deforms upward, thereby reducing the elongation of the spring and reducing the tension. This achieves a small-range adjustment of the tension during use. Combined with the limit rod adjustment, a large-range pre-adjustment of the tension and a small-range adjustment during use can be achieved.

[0031] In this example, the wire rope tensioning device uses the combination of friction and spring tension to fix the position of the fixed rod at a very low cost. The fixed rod is directly connected to the spring and placed on the limit rod. It is subjected to the downward tension of the spring and the friction of the limit rod. The fixed rod uses a copper rod with patterns and concave-convex designs on the surface, and the limit rod uses a flat-head screw with threads, which greatly increases the friction coefficient between the fixed rod and the limit rod. The fixed rod is subjected to a large tension from the spring. Since the spring is connected to the wire rope, and the wire rope is directly connected to the motor, the rotation of the motor during use will drive the spring to rotate, which may cause the spring to deviate. The spring tension is decomposed into a vertical downward tension T and a tension F parallel to the limit rod. 1 and the tension F parallel to the fixed rod 2 , due to the use of a fixed rod and a limit rod with a large friction coefficient, F 1 、F 2 The friction force is always smaller than the maximum static friction force, so that there is no relative sliding between the fixing rod and the limiting rod, thus ensuring that the position of the fixing rod is fixed.

[0032] The present invention realizes an axial tensioning device for winding wire ropes on the motor shaft, which is combined with the characteristics of the axial tensioning device to adapt to the close arrangement of multiple wire ropes. Please refer to Figure 2 , it adopts the close arrangement of multiple motor ropes, which realizes the wide range adjustment of the tension force of multiple close-arranged ropes.

[0033] Please refer to Figure 3 , Figure 3This is a physical picture of an axial tensioning device for winding wire ropes around a motor shaft proposed by the present invention, which is applied to a dexterous hand for online transmission. In the application of the dexterous hand, 11 tensioning mechanisms are arranged in a relatively small space, and the total length and width of the space occupied by the 11 tensioning mechanisms are less than 12 cm. The device realizes the tensioning force adjustment of multiple tightly arranged wire ropes in a narrow space. At the same time, since the tensioning device is an axial tensioning mechanism, the tensioning device cooperates with the driving source motor, which solves the problem that the traditional wire rope tensioning mechanism occupies the space between the driving source and the controlled device. In this case, since the internal space of the dexterous hand is extremely small, the traditional wire rope tensioning mechanism is difficult to use in the dexterous hand. The axial tensioning device places the occupied space at the rear, which reduces the space occupied and realizes the large-range pre-adjustment of the tensioning force and the small-range adjustment during the movement of the wire rope, solving the problem that the tensioning force is difficult to adjust during the movement of the wire rope in a narrow space. In this example, each group of wire ropes includes two wire ropes, and 11 groups of wire ropes are tensioned in a space with a length and width of less than 12 cm, that is, a total of 22 wire ropes are tensioned. The axial tensioning device has an advantage in adjusting the tension of multiple closely arranged wire ropes in a small space.

[0034] Those skilled in the art will readily appreciate other embodiments of the present application after considering the description and practicing the contents disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The description and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the claims.

[0035] It should be understood that the above general description and the detailed description below are only exemplary and explanatory and cannot limit the present application. The present application is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present application is limited only by the attached claims.

Claims

1. An axial tensioning device for winding a wire rope around a motor shaft, characterized in that: The device comprises a lower platform with a motor coupling device installed and an upper platform with a spring tensioning device installed, wherein the motor coupling device and the spring tensioning device are connected by a spring, and the upper and lower platforms are connected by a copper column; The motor coupling device includes a motor and a motor coupling. The motor coupling is provided with a rope hole and an annular guide rail. The annular guide rail is divided into two circles, an upper circle and an lower circle. Two ropes are respectively wrapped around one circle and then passed through the rope hole and connected to each other in the middle of the motor coupling. The connected ropes are connected to the spring.

2. The axial tensioning device for winding a wire rope around a motor shaft according to claim 1, characterized in that: The motor coupling has two threaded holes, and the motor coupling and the motor shaft are connected by screws.

3. The axial tensioning device for winding a wire rope around a motor shaft according to claim 1, characterized in that: The spring tensioning device comprises a limiting rod, a fixing rod and a limiting device; The limiting device is installed with a limiting hole, and the limiting rod passes through the limiting hole; the fixing rod is connected to the spring and fixed on the limiting device through the limiting rod, and the length of the spring is adjusted by adjusting the positions of the fixing rod and the limiting rod.

4. The axial tensioning device for winding a wire rope around a motor shaft according to claim 3, characterized in that: The limiting holes on the limiting device include seven groups, which are used to adjust the positions of the limiting rod and the fixing rod.

5. The axial tensioning device for winding a wire rope around a motor shaft according to claim 3, characterized in that: The fixing rod is made of a copper rod with patterns and concave-convex designs on the surface, and the limiting rod is made of a flat head screw with threads, which increases the friction coefficient between the fixing rod and the limiting rod and avoids slippage.

6. The axial tensioning device for winding a wire rope around a motor shaft according to claim 3, characterized in that: The upper platform is equipped with a plurality of spring tensioning devices, and the lower platform includes a plurality of motor coupling devices, and the number of the spring tensioning devices and the motor coupling devices is the same.

Images