CN110775844B

CN110775844B - Multi-wire pulley

Info

Publication number: CN110775844B
Application number: CN201911068442.9A
Authority: CN
Inventors: 俞芷琳; 戴林吉; 张小彬; 叶岭
Original assignee: Zhejiang Runhua Mechanical & Electrical Co ltd
Current assignee: Zhejiang Runhua Mechanical & Electrical Co ltd
Priority date: 2019-11-05
Filing date: 2019-11-05
Publication date: 2020-12-15
Anticipated expiration: 2039-11-05
Also published as: CN110775844A; CN112607643A; CN112607643B; CN112607642A

Abstract

The invention belongs to the technical field of pulleys, and particularly relates to a multi-wire pulley which comprises a pulley mechanism for a steel rope to pass around, a fixed pulley mechanism, a pulley cantilever for mounting a traction rope, and a pin shaft for connecting the pulley mechanism and the pulley cantilever, wherein under the condition of the same requirement on the pulley cantilever, the arm distance of the pulley cantilever in the shackle type pulley designed by the invention is shorter than that of the pulley cantilever on the traditional shackle type pulley; after the pulley cantilever and the pulley mechanism are used for a long time, the degree of increase of the surface-to-surface fit clearance between the pulley cantilever and the pulley mechanism is small, so that the probability of clamping the steel rope in the clearance is relatively small, and the service life is long; the pulley cantilever comprises two first cantilevers and two second cantilevers, when the two traction ropes need to be pulled from different directions, the two first cantilevers and the two second cantilevers are respectively unfolded towards two sides to form traction points of the pulley cantilever in two different directions, and the pulley cantilever at each traction point in each direction is of a bilateral structure and is high in strength.

Description

Multi-wire pulley

Technical Field

The invention belongs to the technical field of pulleys, and particularly relates to a multi-wire pulley.

Background

The off-road vehicle often uses equipment of getting rid of poverty such as capstan winch, pulley shackle at present in cross-country process, and in the use, capstan winch and pulley shackle combined use, the use of capstan winch can be divided into, application methods such as one-line, two-line and three-line.

The shackle type pulley is formed by connecting a pulley wound by a steel wire rope and a pulley cantilever provided with a traction rope through a pin shaft, and the two pulley cantilevers can rotate relatively to be opened; the steel wire rope is wound on the pulley, even the steel wire rope or the steel wire ring without the opening can be wound on the pulley; however, there are three problems with conventional shackle-style sheaves:

1. the shackle type pulley cantilever can deform after being pulled for a long time, so that the surface-to-surface fit clearance between the pulley cantilever and the pulley becomes larger, and a steel rope can be clamped in the surface-to-surface fit clearance between the pulley cantilever and the pulley;

2. the pulley cantilever on the traditional shackle type pulley consists of two independent cantilevers, when the pulley cantilever needs to be pulled in a single direction, the two cantilevers are combined to form a complete pulley cantilever, when two pulling ropes need to be pulled in different directions, the two cantilevers are unfolded, and one cantilever finishes the pulling in one direction, so that the shackle type pulley cantilever is possibly deformed and damaged due to the fact that the cantilever is too thin, and the pulling is influenced;

3. the pulley on the traditional buckle-releasing type pulley can only wind around one steel wire rope, when a winch and the pulley are needed to form a pulley block to achieve the aim of saving labor, a multi-line buckle-releasing type pulley is needed, one line or two lines of pulleys are generally used, and when the two lines of pulleys are used as the one line of pulleys, the stress of the two lines of pulleys is not on the central plane of the pulleys, so that two groups of pulleys are generally needed to be carried, and the use cost and the carrying burden are increased.

The invention designs a multi-wire pulley to solve the problems.

Disclosure of Invention

In order to solve the defects in the prior art, the invention discloses a multi-wire pulley which is realized by adopting the following technical scheme.

The utility model provides a multi-thread pulley, it includes pulley mechanism, fixed pulley mechanism that confession steel cable walked around and the pulley cantilever of installation haulage rope, the round pin axle of connecting pulley mechanism and pulley cantilever, its characterized in that: the pulley mechanism consists of an installation wheel, an installation rotating wheel and two sliding rings, wherein the installation wheel is eccentrically installed on a pin shaft, the installation rotating wheel is installed on the outer side of the installation wheel in a nested manner through rotating fit, the two sliding rings are installed on the installation rotating wheel in a nested manner, and the two sliding rings can slide back and forth on the installation rotating wheel along the axis of the installation rotating wheel; the pulley cantilever consists of two first cantilevers and two second cantilevers which are symmetrically arranged, the first cantilevers and the second cantilevers which are positioned at the same side form a group of cantilever combinations, and the two cantilever combinations are respectively limited and arranged at two ends of the pin shaft by a clamping ring; the mounting wheel is provided with an oil hole for adding lubricating oil to the matching surface of the mounting wheel and the mounting rotating wheel.

As a further improvement of the technology, the upper ends of the two first cantilevers and the two second cantilevers are respectively provided with a traction hole for connecting a traction rope; two mounting step surfaces are arranged at two ends of the pin shaft; the lower ends of the two first cantilevers and the two second cantilevers are respectively provided with a shaft hole, and the two first cantilevers and the two second cantilevers are respectively arranged on two mounting step surfaces at two ends of the pin shaft through the shaft holes on the two first cantilevers and the two second cantilevers; two mounting step surfaces formed by mounting the two first cantilevers and the two second cantilevers on the pin shaft and an outer circular surface of the pulley mechanism form a step; the two first cantilevers and the two second cantilevers can not interfere with the pulley mechanism when swinging, and the two first cantilevers and the two second cantilevers can play a limiting role in the pulley mechanism to prevent the pulley mechanism from sliding back and forth on the pin shaft and influencing the stability of a steel rope wound around the pulley mechanism.

As a further improvement of the technology, a clamping groove is formed in the outer circular surface of each of the two mounting step surfaces, the inner ends of two clamping rings for limiting the two first cantilevers and the two second cantilevers are respectively nested in the two clamping grooves, and the outer ends of the two clamping rings limit the two first cantilevers and the two second cantilevers; the clamping ring is an elastic ring with an opening; when the pulley is disassembled, the clamping ring is pulled to two sides from the opening of the clamping ring, so that the opening of the clamping ring is enlarged, the clamping ring is taken down, and the pulley is convenient to disassemble subsequently.

As a further improvement of the technology, an end face of the mounting wheel is provided with a mounting circular groove, an oil hole formed in the mounting wheel is positioned between an inner end face of the mounting circular groove and an outer circular face of the mounting wheel, the oil hole comprises an axial oil passage and a radial oil passage reaching the outer circular face, and the two oil passages are communicated; the inner end surface of the mounting circular groove is provided with a nozzle tip convenient for adding lubricating oil; the mounting wheel is mounted on the pin shaft through the eccentric through hole; lubricating oil is added to the contact circular surface of the mounting wheel and the mounting rotating wheel, so that the lubricating degree of the mounting rotating wheel in the relative mounting wheel rotating process is guaranteed, and the oil hole and the oil nozzle on the mounting wheel are processed, manufactured, used and maintained by adopting the prior art.

As a further improvement of the present technology, the mounting wheel is provided with a plurality of weight-reducing through holes for reducing the weight of the pulley mechanism.

As a further improvement of the technology, the outer circular surface of the mounting rotating wheel is provided with a U-shaped groove with a widened bottom surface, and two side surfaces of the U-shaped groove are uniformly provided with a plurality of avoidance notches in the circumferential direction; both ends of the slip ring are semi-U-shaped surfaces, and a plurality of embedding grooves are uniformly formed in the semi-U-shaped surface on one side in the circumferential direction; the two slip rings are arranged in a U-shaped groove for mounting the rotating wheel in a sliding fit manner; through the sliding of the two slip rings, the two slip rings and the U-shaped groove of the mounting rotating wheel form a middle U-shaped groove or two U-shaped grooves at two sides.

As a further improvement of the technology, a plurality of sliding grooves are uniformly formed in the circumferential direction on the bottom surface of the U-shaped groove formed in the outer circumferential surface of the mounting rotating wheel, a plurality of sliding blocks are uniformly formed in the circumferential direction on the inner circumferential surfaces of the two sliding rings, and the two sliding rings are mounted on the mounting rotating wheel through sliding fit of the sliding blocks and the sliding grooves.

As a further improvement of the technology, the shaft holes on the two first suspension arms and the two second suspension arms are connected with the two corresponding step surfaces through sliding bearings.

As a further improvement of the technology, the oil nozzle is fixedly installed in an installation circular groove formed on the installation wheel in a threaded fit mode.

As a further improvement of the technology, the axis of the mounting circular groove, the axis of the eccentric through hole and the axis of the mounting wheel are coplanar.

Compared with the traditional pulley technology, the pulley has the following beneficial effects:

1. under the condition of the same requirement on the pulley cantilever, the pulley cantilever in the shackle type pulley designed by the invention has shorter arm distance compared with the pulley cantilever on the traditional shackle type pulley; after the pulley cantilever and the pulley mechanism are used for a long time, the degree of increase of the surface-to-surface fit clearance between the pulley cantilever and the pulley mechanism is small, the probability of clamping the steel rope in the clearance is relatively small, and the service life is long.

2. The pulley cantilever comprises two first cantilevers and two second cantilevers, when the two traction ropes need to be pulled from different directions, the two first cantilevers and the two second cantilevers are respectively unfolded towards two sides to form traction points of the pulley cantilever in two different directions, and the pulley cantilever at each traction point in each direction is of a bilateral structure and is high in strength.

3. When the pulley slides in a single line or a double line, the stress point is on the central plane, the problem that the stress of the pulley with two lines is not on the central plane of the pulley when the pulley with one line is used is solved, and meanwhile, the length of the installation rotating wheel is reduced through nesting and overlapping of the two slip rings, so that the installation rotating wheel becomes firmer and more stable, and the problem that a single pulley meets the use requirements of the pulley with two lines and the pulley with one line is solved.

Drawings

Fig. 1 is an external view of an entire part.

Fig. 2 is a schematic plan view of the entire part.

Fig. 3 is a schematic view of the internal structure of the integral unit.

Fig. 4 is a schematic view of the installation of the first boom and the second boom.

Fig. 5 is a schematic view of the structure of the first cantilever and the second cantilever.

Fig. 6 is a schematic view of a pulley mechanism installation.

Fig. 7 is a schematic view of the mounting wheel structure.

Fig. 8 is a schematic view of the mounting wheel structure.

Fig. 9 is a schematic view of a slip ring configuration.

Figure 10 is a schematic view of the principle of operation of the mounting wheel and slip ring.

Fig. 11 is a schematic view of the working principle of the first and second cantilevers.

Number designation in the figures: 1. a pulley cantilever; 2. a pin shaft; 3. a pulley mechanism; 4. a snap ring; 5. a first cantilever; 6. a second cantilever; 7. a drawing hole; 8. a shaft hole; 9. a nozzle tip; 10. mounting wheels; 11. installing a rotating wheel; 12. an oil hole; 13. mounting a step surface; 14. a card slot; 15. a weight-reducing through hole; 16. installing a circular groove; 17. a chute; 18. avoiding the notch; 19. embedding a sleeve groove; 20. a slip ring; 21. a slider; 22. an eccentric through hole.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples or figures are illustrative of the present invention and are not intended to limit the scope of the present invention.

As shown in fig. 1 and 2, it includes pulley mechanism 3 for the steel cable to pass around, fixed pulley mechanism 3 and pulley cantilever 1 for installing the hauling cable, pin shaft 2 for connecting pulley mechanism 3 and pulley cantilever 1, its characteristic is: as shown in fig. 9, the pulley mechanism 3 is composed of a mounting wheel 10, a mounting rotating wheel 11 and two sliding rings 20, as shown in fig. 3, the mounting wheel 10 is eccentrically mounted on the pin shaft 2, the mounting rotating wheel 11 is nested outside the mounting wheel 10 through rotating fit, the two sliding rings 20 are nested on the mounting rotating wheel 11, and the two sliding rings 20 can slide back and forth on the mounting rotating wheel 11 along the axis of the mounting rotating wheel 11; as shown in fig. 4 and 5, the pulley cantilever 1 is composed of two first cantilevers 5 and two second cantilevers 6 which are symmetrically installed, the first cantilevers 5 and the second cantilevers 6 which are positioned at the same side form a group of cantilever combinations, and the two cantilever combinations are respectively limited by a snap ring 4 and installed at two ends of a pin shaft 2; as shown in fig. 7, the mounting wheel 10 has oil holes 12 for adding lubricating oil to the mating surface of the mounting wheel 10 and the mounting rotor 11.

In the invention, an installation wheel 10 is eccentrically arranged on a pin shaft 2, a rotating wheel combination which is formed by an installation rotating wheel 11 and a sliding ring 20 and is used for a steel wire to pass through is arranged on the installation wheel 10, and the rotating axis of the rotating wheel combination is the axis of the installation wheel 10; the axis of the mounting wheel 10 is not collinear with the axis of the pin shaft 2, namely the mounting axis of the pulley mechanism 3 consisting of the mounting wheel 10, the mounting rotating wheel 11 and the slip ring 20 is not collinear with the rotation axis; in the traditional shackle type pulley, the installation axis and the rotation axis of the pulley mechanism 3 around which the steel wire passes are both the axes of the pin shaft 2 for installing the pulley mechanism 3; because the fixed pulley mechanism 3 and the pulley cantilever 1 for installing the traction rope are arranged on the pin shaft 2, under the condition of the same requirement on the pulley cantilever 1, the arm distance of the pulley cantilever 1 in the shackle type pulley designed by the invention is shorter than that of the pulley cantilever 1 on the traditional shackle type pulley; in the using process, through the use with the same strength and times, the deformation degree of the pulley cantilever 1 in the shackle type pulley designed by the invention is smaller than that of the pulley cantilever 1 in the traditional shackle type pulley, so that the surface-to-surface fit clearance between the pulley cantilever 1 and the pulley mechanism 3 is increased to a smaller degree after the shackle type pulley is used for a long time, the probability of clamping a steel rope in the clearance is relatively smaller, and the service life is longer.

As shown in fig. 4 and 5, a drawing hole 7 for connecting a drawing rope is formed at the upper end of each of the two first cantilevers 5 and the two second cantilevers 6; two mounting step surfaces 13 are arranged at two ends of the pin shaft 2; the lower ends of the two first cantilevers 5 and the two second cantilevers 6 are respectively provided with a shaft hole 8, and the two first cantilevers 5 and the two second cantilevers 6 are respectively arranged on two mounting step surfaces 13 at two ends of the pin shaft 2 through the shaft holes 8 on the two first cantilevers 5 and the two second cantilevers 6; a step is formed between two mounting step surfaces 13 formed by mounting the two first cantilevers 5 and the two second cantilevers 6 on the pin shaft 2 and an outer circular surface of the mounting pulley mechanism 3; the two first cantilevers 5 and the two second cantilevers 6 are limited by the two steps, so that the two first cantilevers 5 and the two second cantilevers 6 cannot interfere with the pulley mechanism 3 in the swinging process, the two first cantilevers 5 and the two second cantilevers 6 can limit the pulley mechanism 3, the pulley mechanism 3 is prevented from sliding back and forth on the pin shaft 2, and the stability of a steel rope wound on the pulley mechanism 3 is influenced.

As shown in fig. 11, the pulley cantilever 1 of the present invention is composed of two first cantilevers 5 and two second cantilevers 6, when two pulling ropes need to be pulled from different directions, the two first cantilevers 5 and the two second cantilevers 6 are respectively unfolded to two sides to form pulling points of the pulley cantilever 1 in two different directions, the pulley cantilever 1 of each pulling point in each direction is a bilateral structure, has high strength, and is used for connecting the pulling ropes in two different directions; if only one-way traction is needed, two first cantilevers 5 and two second cantilevers 6 are combined to form a superposed pulley cantilever 1; pulley cantilever 1 on traditional shackle formula pulley comprises two solitary cantilevers, when needs unilateral is pull, merges two cantilevers and constitutes a complete pulley cantilever 1, when needing two haulage ropes to pull from different directions, expandes two cantilevers, and the traction of a direction is accomplished to a cantilever, and the traction of a direction leans on the unilateral cantilever to pull, and it is too thin because of the cantilever like this, leads to the cantilever deformation of shackle formula pulley impaired, influences and pulls.

As shown in fig. 6, the outer circular surfaces of the two mounting step surfaces 13 are both provided with a clamping groove 14, the inner ends of the two clamping rings 4 for limiting the two first cantilevers 5 and the two second cantilevers 6 are respectively nested in the two clamping grooves 14, and as shown in fig. 5, the outer ends of the two clamping rings 4 limit the two first cantilevers 5 and the two second cantilevers 6; the snap ring 4 is an elastic ring with an opening; when dismantling, pull snap ring 4 to both sides from the opening part of snap ring 4 earlier for the opening grow of snap ring 4, snap ring 4 is taken off, the follow-up pulley of dismantling of being convenient for.

As shown in fig. 7, a mounting circular groove 16 is formed on one end surface of the mounting wheel 10, an oil hole 12 formed in the mounting wheel 10 is located between an inner end surface of the mounting circular groove 16 and an outer circumferential surface of the mounting wheel 10, the oil hole 12 includes an axial oil passage and a radial oil passage reaching the outer circumferential surface, and the two oil passages are communicated with each other; the inner end surface of the mounting circular groove 16 is provided with a nozzle tip 9 convenient for adding lubricating oil; the mounting wheel 10 is mounted on the pin shaft 2 through an eccentric through hole 22; lubricating oil is added to the contact circular surfaces of the mounting wheel 10 and the mounting rotating wheel 11, so that the lubricating degree of the mounting rotating wheel 11 in the rotating process relative to the mounting wheel 10 is guaranteed, and the oil hole 12 and the oil nozzle 9 in the mounting wheel 10 are processed, manufactured, used and maintained by adopting the prior art.

As shown in fig. 7, the mounting wheel 10 is provided with a plurality of weight-reducing through holes 15 for reducing the weight of the pulley mechanism 3.

The outer circle surface of the mounting rotating wheel 11 is provided with a U-shaped groove with a widened bottom surface, and two side surfaces of the U-shaped groove are uniformly provided with a plurality of avoidance notches 18 in the circumferential direction; both ends of the slip ring 20 are half U-shaped surfaces, and a plurality of embedding grooves 19 are uniformly arranged on one half U-shaped surface in the circumferential direction; the two slip rings 20 are arranged in a U-shaped groove of the mounting rotating wheel 11 in a sliding fit manner; through the sliding of the two slip rings 20, the two slip rings 20 and the U-shaped groove of the mounting wheel 11 form a middle U-shaped groove or two U-shaped grooves at two sides.

As shown in fig. 10, two slip rings 20 designed by the present invention can slide back and forth in the U-shaped groove formed on the mounting wheel 11, and two different forms of complete U-shaped grooves for the steel cable to pass around can be formed by sliding adjustment; firstly, two slip rings 20 are controlled to slide towards the middle for adjustment, complete U-shaped grooves which are symmetrically distributed on two sides are formed to form a double-line pulley, the double-line pulley and a winch form a pulley block to achieve the purpose of labor saving, the formed U-shaped grooves on two sides can accommodate a steel wire rope, and the middle groove is too small to accommodate the steel wire rope; secondly, the two sliding rings 20 are controlled to slide and adjust towards two sides, two half U-shaped surfaces at the opposite ends of the two sliding rings 20 form a complete U-shaped groove, the pulley mechanism 3 in the form can be used for a steel wire to pass around once, the formed middle U-shaped groove can contain the steel wire rope, and the grooves at the two sides are too small to contain the steel wire rope; the pulley mechanisms 3 in different forms are formed by adjusting the sliding of the two sliding rings 20 in the pulley mechanism 3 according to actual conditions, so that the pulley block formed by the shackle type pulley designed by the invention is more convenient to use; when the slip rings 20 designed by the invention slide towards the middle to form two complete U-shaped grooves which are symmetrically distributed, the opposite ends of the two slip rings 20 are mutually nested and overlapped through the nested grooves 19 formed on the two slip rings; when the slip rings 20 slide towards two sides to form a complete U-shaped groove, the opposite ends of the two slip rings 20 are mutually nested and overlapped through the matching of the nesting grooves 19 formed on the slip rings and the avoidance notches 18 formed on the mounting rotating wheel 11; when the pulley of the invention slides in a single line or a double line, the stress point is basically near the central plane, thus solving the problem that the stress of the pulley of the two lines is not on the central plane of the pulley when the pulley of the one line is used, simultaneously reducing the length of the installation rotating wheel 11 by nesting and overlapping the two sliding rings 20, leading the installation rotating wheel 11 to be firmer and more stable, and solving the problem that the single pulley meets the use requirements of the pulley of the double line and the single line. The adjustment of the position of the slip ring 20 is automatically completed by the requirement of the inserted steel wire rope on the size of the corresponding U-shaped groove.

The wall thickness of the thinnest part of the eccentric through hole 22 formed in the mounting wheel 10 and the wall thickness of the mounting rotating wheel 11 both meet the strength requirement of a product in operation, the mounting relation is only illustrated in the drawing, and the structural proportion is not limited.

As shown in fig. 8, a plurality of sliding grooves 17 are uniformly formed in the circumferential direction on the bottom surface of the U-shaped groove formed on the outer circumferential surface of the mounting rotor 11, as shown in fig. 9, a plurality of sliding blocks 21 are uniformly formed in the circumferential direction on the inner circumferential surfaces of the two sliding rings 20, and the two sliding rings 20 are mounted on the mounting rotor 11 through the sliding fit between the sliding blocks 21 and the sliding grooves 17.

The shaft holes 8 on the two first suspension arms 5 and the two second suspension arms 6 are connected with the two corresponding step surfaces through sliding bearings.

The oil nozzle 9 is fixedly installed in an installation circular groove 16 formed in the installation wheel 10 in a threaded fit manner.

The axis of the mounting circular groove 16, the axis of the eccentric through hole 22 and the axis of the mounting wheel 10 are coplanar.

In summary, the following steps:

according to the pulley designed by the invention, under the condition of the same requirement on the pulley cantilever 1, the arm distance of the pulley cantilever 1 in the shackle type pulley designed by the invention is shorter than that of the pulley cantilever 1 on the traditional shackle type pulley; after the pulley cantilever 1 and the pulley mechanism 3 are used for a long time, the surface-to-surface fit clearance increase degree is small, the probability of clamping the steel rope in the clearance is relatively small, and the service life is long; when two traction ropes need to be dragged from different directions, the two first cantilevers 5 and the two second cantilevers 6 are respectively unfolded towards two sides to form traction points of the pulley cantilevers 1 in two different directions, and the pulley cantilever 1 at each traction point in each direction is of a bilateral structure and has high strength; when the pulley provided by the invention slides in a single line or double lines, the stress point is on the central plane, so that the problem that the stress of the pulley with two lines is not on the central plane of the pulley when the pulley with one line is used is solved, and meanwhile, the length of the installation rotating wheel 11 is reduced by nesting and overlapping the two sliding rings 20, so that the installation rotating wheel 11 is firmer and more stable, and the problem that a single pulley meets the use requirements of the pulley with two lines and the pulley with one line is solved.

Claims

1. The utility model provides a multi-thread pulley, it includes pulley mechanism, fixed pulley mechanism that confession steel cable walked around and the pulley cantilever of installation haulage rope, the round pin axle of connecting pulley mechanism and pulley cantilever, its characterized in that: the pulley mechanism consists of an installation wheel, an installation rotating wheel and two sliding rings, wherein the installation wheel is eccentrically installed on a pin shaft, the installation rotating wheel is installed on the outer side of the installation wheel in a nested manner through rotating fit, the two sliding rings are installed on the installation rotating wheel in a nested manner, and the two sliding rings can slide back and forth on the installation rotating wheel along the axis of the installation rotating wheel; the pulley cantilever consists of two first cantilevers and two second cantilevers which are symmetrically arranged, the first cantilevers and the second cantilevers which are positioned at the same side form a group of cantilever combinations, and the two cantilever combinations are respectively limited and arranged at two ends of the pin shaft by a clamping ring; the mounting wheel is provided with an oil hole for adding lubricating oil to the matching surface of the mounting wheel and the mounting rotating wheel.

2. A multi-wire pulley according to claim 1, wherein: the upper ends of the two first cantilevers and the two second cantilevers are respectively provided with a traction hole connected with a traction rope; two mounting step surfaces are arranged at two ends of the pin shaft; the lower ends of the two first cantilevers and the two second cantilevers are respectively provided with a shaft hole, and the two first cantilevers and the two second cantilevers are respectively arranged on two mounting step surfaces at two ends of the pin shaft through the shaft holes on the two first cantilevers and the two second cantilevers.

3. A multi-wire pulley according to claim 2, wherein: the outer circular surfaces of the two mounting step surfaces are respectively provided with a clamping groove, the inner ends of two clamping rings for limiting the two first cantilevers and the two second cantilevers are respectively nested in the two clamping grooves, and the outer ends of the two clamping rings limit the two first cantilevers and the two second cantilevers; the snap ring is an elastic ring with an opening.

4. A multi-wire pulley according to claim 1, wherein: one end surface of the mounting wheel is provided with a mounting circular groove, an oil hole formed in the mounting wheel is positioned between the inner end surface of the mounting circular groove and the outer circular surface of the mounting wheel, the oil hole comprises an axial oil duct and a radial oil duct reaching the outer circular surface, and the two oil ducts are communicated; the inner end surface of the mounting circular groove is provided with a nozzle tip convenient for adding lubricating oil; the mounting wheel is mounted on the pin shaft through the eccentric through hole.

5. A multi-wire pulley according to claim 1, wherein: the mounting wheel is provided with a plurality of lightening through holes for lightening the weight of the pulley mechanism.

6. A multi-wire pulley according to claim 1, wherein: the outer circle surface of the mounting rotating wheel is provided with a U-shaped groove with a widened bottom surface, and two side surfaces of the U-shaped groove are uniformly provided with a plurality of avoidance notches in the circumferential direction; both ends of the slip ring are semi-U-shaped surfaces, and a plurality of embedding grooves are uniformly formed in the semi-U-shaped surface on one side in the circumferential direction; the two slip rings are arranged in a U-shaped groove for mounting the rotating wheel in a sliding fit manner; through the sliding of the two slip rings, the two slip rings and the U-shaped groove of the mounting rotating wheel form a middle U-shaped groove or two U-shaped grooves at two sides.

7. The multi-wire pulley according to claim 6, wherein: a plurality of sliding grooves are uniformly formed in the bottom surface of the U-shaped groove formed in the outer circular surface of the mounting rotating wheel in the circumferential direction, a plurality of sliding blocks are uniformly arranged on the inner circular surfaces of the two sliding rings in the circumferential direction, and the two sliding rings are mounted on the mounting rotating wheel through sliding fit of the sliding blocks and the sliding grooves.

8. A multi-wire pulley according to claim 1, wherein: the shaft holes on the two first cantilevers and the two second cantilevers are connected with the two corresponding step surfaces through sliding bearings.

9. The multi-wire pulley according to claim 4, wherein: the oil nozzle is fixedly arranged in a mounting circular groove formed in the mounting wheel in a threaded matching mode.

10. A multi-wire pulley according to claim 1, wherein: the axis of the mounting circular groove, the axis of the eccentric through hole and the axis of the mounting wheel are coplanar.