CN217947485U - Hoisting mechanism and crane - Google Patents

Abstract

The utility model relates to a hoist technical field provides a hoisting mechanism and hoist. Wherein, should lift by crane the mechanism and include: the lifting assembly comprises a boom; the auxiliary pulley block is rotatably arranged on the arm support; the locking assembly is arranged on the arm support and is detachably connected with the auxiliary pulley block. The utility model provides an among the hoisting mechanism, through set up supplementary assembly pulley on the cantilever crane, realized the optional supplementary assembly pulley of use. The arm support is also provided with a locking assembly, the locking assembly is detachably connected with the auxiliary pulley block, when the auxiliary pulley block is in a non-working position, the auxiliary pulley block can be locked through the locking assembly, the auxiliary pulley block is prevented from shaking along with the arm support, and the auxiliary pulley block and the arm support are protected.

Description

Hoisting mechanism and crane

Technical Field

The utility model relates to a hoist technical field especially relates to a hoisting mechanism and hoist.

Background

The crane refers to a multi-action crane for vertically lifting and horizontally carrying heavy objects within a certain range. The cargo boom of the crane comprises a lifting hook, a boom frame and a fixed pulley block arranged on the boom frame, wherein a movable pulley block is arranged on the lifting hook, and a steel wire rope is wound on the fixed pulley block and the movable pulley block in a proper mode, so that the purpose of lifting heavy objects with a certain labor-saving multiplying power is realized.

In the existing common crane, the fixed pulley block of the boom head is generally designed according to the multiplying power required by the maximum rated load-lifting capacity, but in actual use, medium or light load is often lifted, and the maximum rated load-lifting capacity is rarely lifted. In order to improve the utilization rate of the fixed pulley block, the number of the fixed pulleys can be reduced, and the auxiliary pulley block which can be selectively used is arranged on the arm support of the crane boom, so that the sum of the fixed pulleys and the auxiliary pulleys corresponds to the maximum rated lifting capacity.

However, the auxiliary pulley block is generally hinged to the arm support through a hinge, and the auxiliary pulley block is in a state of being rotatable around the hinge when in a non-working position, and can rock along with the rotation of the arm support, so that the auxiliary pulley block not only collides with the arm support, but also can rub against the steel wire rope, thereby causing damage to the arm support, the auxiliary pulley block or the steel wire rope.

SUMMERY OF THE UTILITY MODEL

The utility model provides a hoisting mechanism and hoist for solve among the prior art auxiliary pulley group and under the inoperative position, can rock along with the rotation of cantilever crane, not only can collide the cantilever crane, still can rub wire rope, thereby cause the defect of cantilever crane, auxiliary pulley group or wire rope's damage, realize when auxiliary pulley group is in the inoperative position, can lock auxiliary pulley group through the locking subassembly, prevent that auxiliary pulley group from rocking along with the cantilever crane, protection auxiliary pulley group and cantilever crane.

The utility model provides a hoisting mechanism, include:

the lifting assembly comprises a boom;

the auxiliary pulley block is rotatably arranged on the arm support so as to be converted between a working position and a non-working position;

the locking assembly is arranged on the arm support and is suitable for being detachably connected with the auxiliary pulley block when the auxiliary pulley block is in the non-working position.

According to the utility model provides a pair of lift by crane the mechanism, the locking Assembly includes:

the locking plate is arranged on the arm support;

the locking plate and the auxiliary pulley block are detachably connected through the pin.

According to the utility model provides a lifting mechanism, the lifting component comprises a fixed pulley block, and the fixed pulley block is arranged on the tail arm of the arm support;

the auxiliary pulley block is arranged on one section of arm of the arm support and is positioned between the fixed pulley block and the locking plate.

According to the utility model provides a pair of lift by crane the mechanism, the quantity of auxiliary pulley block is at least one, the quantity of locking subassembly with the quantity of auxiliary pulley block is unanimous.

According to the utility model provides a pair of lift by crane the mechanism, the quantity of supplementary assembly pulley is a plurality of, and a plurality of the coaxial setting of supplementary assembly pulley.

According to the utility model provides a pair of lift by crane mechanism, auxiliary pulley in the auxiliary pulley group with the axial direction parallel of fixed pulley in the fixed pulley group, just auxiliary pulley with the fixed pulley staggered arrangement.

According to the utility model provides a pair of lift by crane the mechanism, follow the axial of standing block, supplementary assembly pulley sets up at least one side of standing block.

According to the utility model provides a pair of lift by crane mechanism, supplementary assembly pulley includes:

the lifting lug is arranged on one section of arm of the arm support;

the support, the support rotationally sets up on the lug, just be provided with rotatable supplementary pulley on the support.

According to the utility model provides a pair of lift by crane mechanism, be provided with the reinforcing plate on the support, the reinforcing plate with the axial direction of supplementary pulley is parallel.

The utility model also provides a crane, including any one of above-mentioned hoisting mechanism.

The utility model provides an among the hoisting mechanism, through set up supplementary assembly pulley on the cantilever crane, realized the optional supplementary assembly pulley of use. The arm support is also provided with a locking assembly, the locking assembly is detachably connected with the auxiliary pulley block, when the auxiliary pulley block is in a non-working position, the auxiliary pulley block can be locked through the locking assembly, the auxiliary pulley block is prevented from shaking along with the arm support, and the auxiliary pulley block and the arm support are protected.

The embodiment of the utility model provides an in the hoist, owing to used like above hoisting mechanism, consequently possess like above each item advantage, no longer describe herein.

Additional aspects and advantages of embodiments of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of embodiments of the invention.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a lifting mechanism provided by the present invention;

fig. 2 is one of the schematic structural diagrams of the auxiliary pulley block and the locking component in the lifting mechanism provided by the present invention;

fig. 3 is a schematic view of a threading structure of a steel wire rope in a hoisting mechanism provided by the present invention;

fig. 4 is a second schematic structural view of an auxiliary pulley block and a locking assembly in a hoisting mechanism provided by the present invention;

reference numerals:

100: a hoisting mechanism;

110: a hoisting assembly; 111: a boom; 112: a segment of arm; 113: a distal arm; 114: a hook; 115: a fixed pulley block; 116: a movable pulley block; 117: a wire rope; 118: a winch; 119: fixing a steel wire rope; 1110: a guide pulley;

120: an auxiliary pulley block; 121: lifting lugs; 122: a support; 123: a reinforcing plate;

130: a locking assembly; 131: a locking plate; 132: a pin.

Detailed Description

To make the objects, technical solutions and advantages of the present invention clearer, the drawings of the present invention are combined to clearly and completely describe the technical solutions of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description of the embodiments and for simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" should be interpreted broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the embodiments of the present invention can be understood in specific cases by those skilled in the art.

In embodiments of the invention, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description of the present specification, references to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.

While the embodiments of the present invention will be described with reference to fig. 1 to 4, it should be understood that the following is only an exemplary embodiment of the present invention and does not limit the present invention in any way.

Fig. 1 is a schematic structural diagram of a lifting mechanism provided in the present invention, please refer to fig. 1. The embodiment of the utility model provides a hoisting mechanism 100, this hoisting mechanism 100 can set up on multiple hoist for hoist and mount heavy object. This hoisting mechanism 100 includes: a lifting assembly 110, an auxiliary pulley block 120 and a locking assembly 130. Wherein the lifting assembly 110 is capable of securing, lifting and transferring a weight. The lifting assembly 110 comprises a boom 111, and an auxiliary pulley block 120 and a locking assembly 130 are arranged on the boom 111. Wherein the auxiliary pulley assembly 120 is selectively usable to switch between an operative position and an inoperative position. The locking assembly 130 is detachably connected with the auxiliary pulley block 120, and the auxiliary pulley block 120 can be locked by the locking assembly 130 when the auxiliary pulley block 120 is in the non-working position. When the auxiliary pulley block 120 is in the operating position, the locking assembly 130 may be opened and the auxiliary pulley block 120 deployed.

The utility model provides an among the hoisting mechanism 100, through set up supplementary assembly pulley 120 on cantilever crane 111, realized the optional supplementary assembly pulley 120 of use. The arm support 111 is further provided with a locking assembly 130, the locking assembly 130 is detachably connected with the auxiliary pulley block 120, when the auxiliary pulley block 120 is in a non-working position, the auxiliary pulley block 120 can be locked through the locking assembly 130, the auxiliary pulley block 120 is prevented from shaking along with the arm support 111, the auxiliary pulley block 120 and the arm support 111 are protected, and the device is simple in structure, easy to operate, economical and efficient.

Moreover, the auxiliary pulley block 120 can be used as an optional component to be added to an existing crane to form the lifting mechanism 100, and the auxiliary pulley block 120 has high universality. Within the range allowed by the weight of the crane, the auxiliary pulley block 120 can be selectively used, and the flexibility of the operation process is higher.

It should be noted that the above-mentioned hoisting assembly 110 can fix, hoist and transfer heavy objects. That is to say, the lifting assembly 110 may further include a hook 114 and a fixed pulley block 115 disposed on the arm support 111, and the hook 114 is provided with a movable pulley block 116. When the auxiliary pulley block 120 is in a non-working position, the wire rope 117 is threaded and wound on the fixed pulley block 115 and the movable pulley block 116 in a proper mode, and the winch 118 is used as power to lift heavy objects with a certain labor-saving multiplying power. When the auxiliary pulley block 120 is at a working position, the rope winding mode and action of the auxiliary pulley block 120 are the same as those of the fixed pulley block 115, the direction of the force is changed by winding the steel wire rope 117 through the fixed pulley block 115 and the auxiliary pulley block 120, and the auxiliary pulley block is matched with the movable pulley block 116, so that the heavy object is lifted by taking the winch 118 as power and by a larger labor-saving multiplying power. The auxiliary pulley block 120 increases the rope winding rate of the steel wire rope 117, reduces the single rope force borne by the steel wire rope 117, and can also meet the hoisting capacity of the arm support 111.

It should be noted that, during the use process, the number of the movable pulleys in the movable pulley block 116 needs to be configured according to the number of the fixed pulleys in the fixed pulley block 115 and the number of the auxiliary pulleys in the auxiliary pulley block 120, that is, the number of the movable pulleys available for use needs to be greater than or equal to the sum of the numbers of the fixed pulleys and the auxiliary pulleys. When the auxiliary pulley block 120 is used, the corresponding movable pulley block 116 may be arranged according to a required rope winding ratio.

Of course, the lifting assembly 110 may have other structures, which is not limited in this embodiment. The type of the steel wire rope 117 used with the crane includes a phosphated coated steel wire rope, a galvanized steel wire rope, a plain steel wire rope, and the like, which is not limited in this embodiment.

Fig. 2 is a schematic structural diagram of an auxiliary pulley block and a locking assembly in a hoisting mechanism according to the present invention, please refer to fig. 2. In an embodiment of the present invention, the locking assembly 130 includes: a locking plate 131 and a pin 132. The locking plate 131 is disposed on the arm support 111, and may be fixed by welding, adhering, riveting, or the like, for example, which is not limited in this embodiment. The locking plate 131 and the auxiliary block pulley 120 are detachably connected by a pin 132. Specifically, the locking plate 131 is provided with a pin hole, and the auxiliary pulley block 120 is also provided with a corresponding pin hole, and the auxiliary pulley block 120 is locked by inserting a pin 132 into the pin hole.

Further, the locking plate 131 includes a protrusion, and the protrusion is provided with a pin hole, so that the locking plate 131 is prevented from being too large to interfere with the movement of the auxiliary pulley block 120. The auxiliary pulley block 120 may also include a protrusion, and the protrusion may also be provided with a pin hole, so that the pin 132 is away from the auxiliary pulley, thereby facilitating the installation of the pin 132.

It should be noted that the boom 111 of the crane is generally a telescopic multi-section boom, wherein one section of the boom 112 may be connected to the rotating platform, the last section of the boom 113 is located at the end of the boom 111, and a multi-section boom may be further disposed between the one section of the boom 112 and the last section of the boom 113, so as to form a telescopic structure.

In the above embodiment, the fixed pulley block 115 in the lifting assembly 110 is disposed on the last arm 113 of the boom 111, and the auxiliary pulley block 120 is disposed on one arm 112 of the boom 111, so that the weight of the last arm 113 can be reduced, and the reduction of the actual weight that the crane can bear due to excessive fixed pulleys is avoided. Thus, this structure can improve stability during lifting. In addition, the auxiliary pulley block 120 is located between the fixed pulley block 115 and the locking plate 131, that is, the auxiliary pulley block 120 is locked by the locking plate 131, and in fact, the auxiliary pulley block 120 is rotated in a direction away from the fixed pulley block 115 and then locked, so that the auxiliary pulley block 120 can be kept away from the wire rope 117 as much as possible, and the wire rope 117 is prevented from being rubbed.

In a further embodiment, the number of the auxiliary pulley assemblies 120 is at least one, and specifically, the number of the auxiliary pulley assemblies 120 may be set according to needs, which is not limited in this embodiment. The number of the locking assemblies 130 corresponds to the number of the auxiliary pulley blocks 120, so that each auxiliary pulley block 120 can be locked by the corresponding locking assembly 130.

It should be noted that at least one auxiliary pulley can be disposed in each auxiliary pulley block 120, and the auxiliary pulleys can be independent from each other so as not to interfere with each other during the rotation process.

In the above embodiment, the number of the auxiliary pulley assemblies 120 may be multiple, and the multiple auxiliary pulley assemblies 120 are coaxially disposed. The structure can ensure the balanced stress among the auxiliary pulleys and is beneficial to prolonging the service life of the auxiliary pulley block 120.

In a further embodiment, the auxiliary pulley of the auxiliary pulley set 120 is parallel to the fixed pulley of the fixed pulley set 115 along the axial direction of the fixed pulley set 115, and the structure reduces the axial acting force applied to the auxiliary pulley set 120. The auxiliary pulleys and the fixed pulleys are arranged in a staggered mode, so that the auxiliary pulleys and any fixed pulley can be prevented from being in the same plane. In this structure, the wire rope 117 may be passed through the fixed sheave in one direction in the axial direction of the fixed sheave without being turned back during the process of passing through the fixed sheave, the movable sheave, and the auxiliary sheave in sequence. Therefore, the inclination angle of the steel wire rope 117 can be reduced as much as possible, and the axial acting force applied to the auxiliary pulley block 120 can be further reduced.

Fig. 3 is a schematic view of a threading structure of a steel wire rope in a hoisting mechanism according to the present invention, please refer to fig. 3. In use, one end of the cable 117 may be a cable fixing point 119 fixed to the boom 111, and the other end of the cable 117 may be wound around the guide pulley 1110 to connect to the winch 118 or other power components, which is not limited in this embodiment. For example, the number of the fixed sheave and the auxiliary sheave is one, the number of the movable sheave is two, and these sheaves are provided in the middle of the passage of the wire rope 117. In the vertical plane, the fixed pulley block 115, the auxiliary pulley block 120 and the movable pulley block 116 may form three vertexes of a triangle. Along the axial of fixed pulley, first movable pulley, supplementary pulley, second movable pulley set gradually, then the orbit of wearing and coiling of wire rope 117 can be along fixed pulley, first movable pulley, supplementary pulley, second movable pulley. In this configuration, since the fixed sheave and the auxiliary sheave are not in the same plane, the wire rope 117 does not turn back in the axial direction of the fixed sheave when the wire rope 117 is wound around the auxiliary sheave after the wire rope 117 has been wound around the fixed sheave and the first movable sheave. Therefore, the inclination of the section of the steel wire rope 117 continuously winding back the second movable pulley is prevented from being too large, so that the inclination of the steel wire rope 117 between any two pulleys is smaller, the integral stress of the steel wire rope 117 can be ensured to be uniform, and larger axial acting force cannot be caused to each pulley.

It should be noted that there are a plurality of joint arms between the one-joint arm 112 and the last-joint arm 113 of the arm support 111, and each joint arm is usually telescopically arranged in the upper-joint arm 112. That is, the width of each arm gradually decreases from the arm 112 to the arm 113. Thus, the width of one segment arm 112 is greater than the width of the last segment arm 113. In a further embodiment of the present invention, the auxiliary pulley block 120 is disposed on at least one side of the fixed pulley block 115 along the axial direction of the fixed pulley block 115. For example, if the number of the auxiliary pulley block 120 is one, the auxiliary pulley block 120 is disposed at one side of the fixed pulley block 115. For example, if the number of the auxiliary pulley blocks 120 is two, the two auxiliary pulley blocks 120 may be respectively disposed at both sides of the fixed pulley block 115. The structure utilizes the characteristic that the width of one section of arm 112 is larger than that of the tail section of arm 113 to reasonably arrange the auxiliary pulley block 120.

Based on the structure, the steel wire can be wound in a unidirectional way along the axial direction of the fixed pulley block 115. That is, the matching between the fixed pulley and the movable pulley and the matching between the auxiliary pulley and the movable pulley are not interfered with each other. Further, the crossing of the passing route of the wire rope 117 is reduced in the process of sequentially passing the wire rope 117 among the fixed sheave, the movable sheave and the auxiliary sheave.

Fig. 4 is a second schematic structural view of the auxiliary pulley block and the locking assembly in the lifting mechanism provided by the present invention, please refer to fig. 2 and fig. 4. In the above embodiment, the auxiliary pulley block 120 includes: a lifting lug 121 and a bracket 122. The lifting lug 121 is disposed on one section of the arm 112 of the arm support 111, and may be fixed by welding, bonding, riveting, or the like, for example, which is not limited in this embodiment. The bracket 122 is connected to the lifting lug 121 and can rotate relative to the lifting lug 121 for changing the position of the bracket 122. At least one auxiliary pulley is arranged on the bracket 122, the wire rope 117 can be wound on the auxiliary pulley, and the auxiliary pulley can rotate relative to the bracket 122 under the driving of the wire rope 117.

Wherein, the lifting lug 121 and the bracket 122 can be hinged by a hinge to realize the rotation of the auxiliary pulley block 120. Moreover, the lifting lugs 121 may further include a protrusion, and the protrusion is provided with a through hole, so as to provide a larger rotation space for the auxiliary pulley block 120. The auxiliary pulley block 120 may also include a protrusion, and the protrusion is also provided with a through hole, which is connected to the through hole through a rotating shaft.

In a further embodiment, the bracket 122 is provided with a reinforcing plate 123, and the reinforcing plate 123 is parallel to the axial direction of the auxiliary pulley. The reinforcing plate 123 can reinforce the strength of the bracket 122, and can also limit the wire rope 117 which is threaded on the auxiliary pulley. The reinforcing plate 123 is simple in structure and convenient to process. Specifically, the number of the reinforcing plates 123 may be one or more, and the embodiment does not limit this.

Further, the bracket 122 includes two opposite support plates, the auxiliary pulley is disposed between the two support plates, and the reinforcing plate 123 may also be disposed between the two support plates to reinforce strength and limit the wire rope 117.

The utility model provides an among the hoisting mechanism 100, through set up supplementary assembly pulley 120 on cantilever crane 111, realized optional use supplementary assembly pulley 120. The arm support 111 is further provided with a locking assembly 130, the locking assembly 130 is detachably connected with the auxiliary pulley block 120, when the auxiliary pulley block 120 is in a non-working position, the auxiliary pulley block 120 can be locked through the locking assembly 130, the auxiliary pulley block 120 is prevented from shaking along with the arm support 111, the auxiliary pulley block 120 and the arm support 111 are protected, and the device is simple in structure, easy to operate, economical and efficient.

Furthermore, the fixed pulley block 115 in the hoisting assembly 110 is arranged on the last arm 113 of the arm support 111, and the auxiliary pulley block 120 is arranged on one arm 112 of the arm support 111, so that the weight of the last arm 113 can be reduced, and the reduction of the actual bearing weight of the crane due to excessive fixed pulleys can be avoided. Therefore, this structure can improve stability during lifting. In addition, the auxiliary pulley block 120 is located between the fixed pulley block 115 and the locking plate 131, that is, the auxiliary pulley block 120 is locked by the locking plate 131, and in fact, the auxiliary pulley block 120 is rotated in a direction away from the fixed pulley block 115 and then locked, so that the auxiliary pulley block 120 can be kept away from the wire rope 117 as much as possible, and the wire rope 117 is prevented from being rubbed. The auxiliary pulley block 120 is disposed on at least one side of the fixed pulley block 115 in the axial direction of the fixed pulley block 115. The structure utilizes the characteristic that the width of one section of arm 112 is larger than that of the tail section of arm 113 to reasonably arrange the auxiliary pulley block 120.

The embodiment of the utility model provides a hoist is still provided, including any one kind of above-mentioned hoisting mechanism 100. The auxiliary pulley block 120 is arranged on the arm support 111 of the lifting mechanism 100, so that the optional use of the auxiliary pulley block 120 is realized. The arm support 111 is further provided with a locking assembly 130, the locking assembly 130 is detachably connected with the auxiliary pulley block 120, when the auxiliary pulley block 120 is in a non-working position, the auxiliary pulley block 120 can be locked through the locking assembly 130, the auxiliary pulley block 120 is prevented from shaking along with the arm support 111, the auxiliary pulley block 120 and the arm support 111 are protected, and the device is simple in structure, easy to operate, economical and efficient.

Specifically, the crane further comprises a rotating platform, and the hoisting mechanism 100 can be installed on the rotating platform of the crane, and can realize a plurality of actions such as vertical hoisting of heavy objects, or horizontal transportation of heavy objects and the like through cooperation of the rotating platform and the hoisting structure.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims (10)

1. A hoisting mechanism, comprising:

a lifting assembly comprising a boom;

the auxiliary pulley block is rotatably arranged on the arm support so as to be converted between a working position and a non-working position;

the locking assembly is arranged on the arm support and is suitable for being detachably connected with the auxiliary pulley block when the auxiliary pulley block is in the non-working position.

2. The hoisting mechanism of claim 1, wherein the locking assembly comprises:

the locking plate is arranged on the arm support;

the locking plate and the auxiliary pulley block are detachably connected through the pin.

3. The hoisting mechanism of claim 2 wherein the hoisting assembly comprises a set-down pulley disposed at a last arm of the boom;

the auxiliary pulley block is arranged on one section of arm of the arm support and is positioned between the fixed pulley block and the locking plate.

4. The hoisting mechanism of claim 3 wherein the number of said set of auxiliary pulleys is at least one and the number of said locking assemblies corresponds to the number of said set of auxiliary pulleys.

5. The hoisting mechanism of claim 4 wherein said plurality of auxiliary pulley assemblies is a plurality and a plurality of said auxiliary pulley assemblies are coaxially disposed.

6. The hoisting mechanism of claim 5 wherein the auxiliary sheave of the set of auxiliary sheaves is parallel to the axial direction of the fixed sheave of the set of fixed sheaves and the auxiliary sheave is staggered from the fixed sheave.

7. Hoisting mechanism according to claim 6, characterized in that the auxiliary pulley block is arranged on at least one side of the set of standing pulleys in the axial direction of the set of standing pulleys.

8. Hoisting mechanism according to any one of claims 1 to 7, wherein the auxiliary pulley block comprises:

the lifting lug is arranged on one section of arm of the arm support;

the support, the support rotationally sets up on the lug, just be provided with rotatable supplementary pulley on the support.

9. The hoisting mechanism of claim 8 wherein said bracket is provided with a reinforcement plate, said reinforcement plate being parallel to the axial direction of said auxiliary sheave.

10. A crane comprising a hoisting mechanism as claimed in any one of claims 1 to 9.

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