CN210655823U - Lifting system and engineering machinery - Google Patents

Abstract

The utility model discloses a play to rise system and engineering machine tool relates to the engineering machine tool field for optimize the structure that plays to rise the system. The lifting system comprises a balance beam, a hook head and a pulley block. The compensating beam includes the body and sets up first mounting hole and the second mounting hole of body, and the second mounting hole is arranged in a row. The hook head is connected with the first mounting hole. The pulley block is selectively arranged on part of the second mounting hole. According to the technical scheme, the structure of the lifting system is optimized, so that the lifting system can meet the requirements of more use working conditions.

Description

Lifting system and engineering machinery

Technical Field

The utility model relates to an engineering machine tool field, concretely relates to play to rise system and engineering machine tool.

Background

The hoisting system of a crane is generally composed of a winch, a steel wire rope, a boom block and a hook. The number of winches used by the crane is one or two. According to whether the central line of each row of pulleys of a suspension arm pulley block provided with a lifting hook can incline relative to the horizontal line or not in the operation process, the lifting hook is divided into a balance lifting hook and an unbalanced lifting hook. The balance hook means that the central line of each row of pulleys of a suspension arm pulley block provided with the balance hook is always parallel to the horizontal line in the hoisting operation process. The unbalanced lifting hook means that the central line of each row of pulleys of a lifting arm pulley block provided with the lifting hook can incline relative to the horizontal line in the lifting operation process, and the central line and the horizontal line form an included angle.

The single-winch lifting system comprises a winch, a suspension arm pulley block and an unbalanced lifting hook, and the lifting hook in the single-winch lifting system is also called the unbalanced lifting hook. The double-winch lifting system comprises two winches, two suspension arm pulley blocks and a lifting hook, wherein the lifting hook in the double-winch lifting system is also called a balance lifting hook.

When the hoisting capacity is small, the hoisting system used comprises a hoisting and an unbalanced lifting hook. One end of a steel wire rope is wound on the winch, and the other end of the steel wire rope is wound between the suspension arm pulley block and the lifting hook in a set winding mode. The lifting hook can load a heavy object, and the steel wire rope is wound and unwound through the winding rotation, so that the distance between the suspension arm pulley block and the lifting hook is changed, and the actions of lifting and descending the heavy object are realized. Because the transmission efficiency of the pulleys is less than 1, the tension of the steel wire ropes passing around the pulleys is unequal, and the hook pulley block can incline to a certain degree during action.

When the lifting capacity is large, the adopted lifting system comprises a double winch and a balance lifting hook. The two winches are independent and are respectively connected with a pulley block through a steel wire rope. And one end of a steel wire rope is wound on each winch, and the other end of the steel wire rope is wound between the pulley block on one side of the suspension arm and the pulley block on one side of the lifting hook in a set winding mode. The pulley blocks of the two winches are connected with the same hook head to form a split pulley block lifting hook. The hook is required to have certain balance capacity to contain the action synchronization error of the double winches, and all the pulley blocks are kept horizontal within a certain error range. The lifting hook of components of a whole that can function independently structure can convert the whole assembly pulley lifting hook of other tonnages into, for example: assuming that the hook has a rated load of 400 tons, one set of pulleys is removed and the other set of pulleys is left alone to form an unbalanced hook with a rated load of 200 tons. But sometimes a 300 ton unbalanced hook is required and a new hook is designed.

The inventor finds that at least the following problems exist in the prior art: the application range of the hoisting system in the prior art is limited by the design of original products, and the hoisting system cannot meet the requirements of multi-occasion use.

SUMMERY OF THE UTILITY MODEL

The utility model provides a play to rise system and engineering machine tool for optimize the structure that plays to rise the system.

An embodiment of the utility model provides a play to rise system, include:

the balance beam comprises a body, a first mounting hole and a second mounting hole, wherein the first mounting hole and the second mounting hole are formed in the body;

the hook head is connected with the first mounting hole; and

and the pulley block is selectively arranged on part of the second mounting holes.

In some embodiments, the first mounting hole is disposed at a bottom of the balance beam, and the second mounting hole is disposed at a top of the balance beam.

In some embodiments, the hoist system further comprises:

and the connecting piece is connected with one end of the pulley block, which is far away from the balance beam.

In some embodiments, the number of the pulley blocks is two, and one end of each pulley block, which is far away from the balance beam, is connected with the connecting piece; and the two pulley blocks are respectively wound with a steel wire rope.

In some embodiments, the pulley block is provided with a connecting portion, the connecting portion is provided with a connecting hole, and the connecting hole is connected with the connecting piece.

In some embodiments, the number of the pulley blocks is two, and the wire ropes wound on the pulley blocks are connected in series.

In some embodiments, the hook head is connected with the first mounting hole through a first pin; and/or the pulley block is connected with the second mounting hole through a second pin shaft.

In some embodiments, one of the third mounting holes is located on a vertical centerline of the pulley block, and the other of the third mounting holes is located near the vertical centerline; wherein each of the pulleys of the set of pulleys is symmetrical with respect to the vertical centerline.

In some embodiments, one of the third mounting holes is located on a centerline of the pulley block and the other of the third mounting holes is located near the centerline; wherein each of the pulleys of the set of pulleys is symmetrical with respect to the centre line.

An embodiment of the utility model provides an engineering machine tool is still provided, include the utility model discloses the play to rise system that arbitrary technical scheme provided.

In some embodiments, the work machine comprises a crane.

According to the lifting system provided by the technical scheme, the balance beam is provided with the first mounting hole and the row of second mounting holes, and the pulley block can be mounted in any second mounting holes. When the hoisting weight of the hoisting system and the number of the pulley blocks need to be changed, the pulley blocks can be conveniently detached, and the mounting positions of the pulley blocks on the balance beam can be changed, so that the use requirements can be met. Therefore, according to the technical scheme, the structure of the lifting system is optimized, so that the lifting system can meet the requirements of more use working conditions.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:

fig. 1 is a schematic partial structural view of a hoisting system provided in an embodiment of the present invention;

fig. 2 is a schematic partial structural view of a hoisting system according to an embodiment of the present invention, in which a pulley block is located at another position;

FIG. 3 is a schematic view of the structure of FIG. 1 with a pulley block removed;

FIG. 4 is another schematic view of the structure of FIG. 1 with a pulley block removed;

fig. 5 is a schematic view of a partial structure of a hoisting system provided by an embodiment of the present invention, in which double winding is adopted;

fig. 6 is a schematic view of a state of equilibrium of the hoisting system shown in fig. 5 when the heights of the two pulley blocks are different;

fig. 7 is a schematic view of a winding structure of two pulley blocks when a single winding is adopted in the hoisting system provided by the embodiment of the present invention;

fig. 8 is a schematic view of a winding structure of a single pulley block when a single winch is adopted in the hoisting system provided by the embodiment of the present invention;

fig. 9 is a schematic structural diagram of a pulley block of a hoisting system provided in an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a hook of a hoisting system according to an embodiment of the present invention.

Detailed Description

The technical solution provided by the present invention will be explained in more detail with reference to fig. 1 to 10.

Technical terms or nouns used in the present embodiment need to be interpreted.

A crane: machines for lifting and moving weights.

Suspension arm: the crane is positioned between the main machine and the lifting hook and is used for supporting a part for bearing a heavy object.

Hoisting: and the crane is provided with a mechanism for winding the steel wire rope and providing tension for the lifting hook through the steel wire rope.

Lifting hook: the crane is provided with a device for hooking and hoisting a heavy object.

Hooking heads: the lifting hook is used for hooking a part of a heavy object.

Pulley block: the crane is provided with a device which is composed of more than one pulley and realizes that a larger pulling force is obtained by a smaller single rope pulling force.

Unbalanced lifting hook: the pulley block and the lifting hook balance beam are fixedly connected, and the lifting hook does not have a balance function.

And (3) balancing a lifting hook: the pulley block and the hook balance beam are movably connected, the heights of the pulley blocks can be different, but the pulley blocks are not inclined, and the hook has a balance function.

The pulley block 3 is not inclined, which means that the central line L1 of each row of pulleys of the fixed pulley of the pulley block 3 is not inclined, as shown in fig. 5 and 6, taking the hoisting system including two pulley blocks 3 as an example, when the heights of the pulleys connected with the balance beam 1 of the two pulley blocks 3 are different, the central line L1 of the pulley above is still horizontal.

Referring to fig. 1, an embodiment of the present invention provides a lifting system, including a balance beam 1, a hook 2, and a pulley block 3. The balance beam 1 includes a body 11, and a first mounting hole 12 and a second mounting hole 13 provided in the body 11, the second mounting holes 13 being arranged in a row. The hook head 2 is connected to the first mounting hole 12. The pulley block 3 is selectively mounted on part of the second mounting hole 13.

Referring to fig. 1 to 4, in some embodiments, the first mounting hole 12 is provided at the bottom of the balance beam 1, and the second mounting hole 13 is provided at the top of the balance beam 1.

The hook head 2 is rotatably connected with the balance beam 1, and is specifically connected by inserting the first pin 5 into the first mounting hole 12. In the process of hoisting heavy objects, the hook can rotate freely relative to the balance beam 1, so that the posture of the hook is always kept along the gravity direction, namely vertical. The first mounting hole 12 is formed in the bottom of the balance beam 1, and the hook head 2 is convenient to mount.

In some embodiments, the second pin 6 passes through the pulley block 3 and the second mounting hole 13 on the balance beam 1 to realize the connection between the pulley block 3 and the balance beam 1. Above-mentioned connected mode makes things convenient for the dismantlement of assembly pulley 3, installation and changes the mounted position to realize lifting system's structural deformation, realize that a hook is multi-purpose, one set of lifting system can satisfy the user demand of multiple difference promptly.

Fig. 1 illustrates a situation where two pulley blocks 3 are respectively installed on both sides of a balance beam 1. When the lifting weight of the lifting system needs to be changed, the two pulley blocks 3 are moved towards the middle area of the balance beam 1, so that the two pulley blocks 3 are adjacent, as shown in fig. 2, the winding of the steel wire ropes on the two pulley blocks 3 can be changed, the two pulley blocks 3 use the same group of steel wire ropes, namely the two pulley blocks 3 are changed from independent winding to the winding of the same steel wire ropes, and the lifting amount of the lifting system is changed.

When only one pulley block 3 is needed, one pulley block 3 can be detached, and the other pulley block 3 is reserved. For clarity, the two pulley blocks 3 are respectively the first pulley block 31 and the second pulley block 32. The first pulley block 31 is removed, only the second pulley block 32 is remained, and the mounting position of the second pulley block 32 and the balance beam 1 is moved to the second mounting hole 13 in the middle of the balance beam 1, as shown in fig. 3.

Fig. 4 illustrates the situation where the second pulley block 32 is removed and only the first pulley block 31 remains. By means of the rotatable connection of the first pulley block 31 to the compensating beam 1, a situation is obtained in which the centre of gravity of the compensating beam 1 is located on the vertical centre line L2 of the first pulley block 31.

The second mounting holes 13 are arranged in a row, such as one or more rows. In the situation illustrated in fig. 1 and 2, a row of second mounting holes 13 is provided. The distance between two adjacent second mounting holes 13 is set as required, and when the device is used, the second mounting holes 13 with proper distance are selected as required. The second mounting hole 13 is preferably formed in the top of the balance beam 1 to reduce the size of the balance beam 1, so that the balance beam 1 can be as small as possible and is light. In this context, "top" and "bottom" are used with reference to the hoist system in use.

With continued reference to fig. 1, in order to facilitate the connection of the two pulley arrangements 3 together, in some embodiments the hoisting system further comprises a connecting member 4, the connecting member 4 being connected to an end of the pulley arrangement 3 remote from the balance beam 1.

The concrete connection mode is as follows: one ends of the two pulley blocks 3, which are far away from the balance beam 1, are connected with a connecting piece 4; and the two pulley blocks 3 are respectively wound with steel wire ropes, namely the two pulley blocks 3 are connected in parallel. The winding mode of the two pulley blocks 3 is shown in fig. 5, and the two pulley blocks 3 are respectively wound with steel wire ropes. When the two pulley blocks 3 are not synchronized, as shown in fig. 6, the heights of the respective movable pulleys of the two pulley blocks 3 are different, so that the connecting member 4 and the balance beam 1 are inclined, but the heights of the fixed pulleys of the two pulley blocks 3 are always the same, i.e., the center line L1 is horizontal, i.e., the hoisting system of the structure has compatibility with the asynchronous movement of the first pulley block 31 and the second pulley block 32, and is also called as having a balancing capability.

Since the second mounting holes 13 of the hoisting system provided in the above embodiment are arranged in a row, the positions of the two pulley blocks 3 relative to the balance beam 1 can be arranged as required, as shown in fig. 7, fig. 7 illustrates that the movable pulleys of the two pulley blocks 3 are arranged side by side, and the same wire rope is used to bypass the two pulley blocks 3. Because the positions of the two pulley blocks 3 are very close, even if one steel wire rope is adopted, the entrance angle of the steel wire rope when the steel wire rope enters each pulley block 3 is not too large, and the use requirement can be met. The same steel wire rope is adopted to wind around two adjacent pulley blocks 3, and the steel wire ropes wound on the pulley blocks 3 are connected in series.

As shown in fig. 9, in order to realize the installation positioning of the pulley block 3, in some embodiments, the pulley block 3 is provided with two third installation holes 33, and both the two third installation holes 33 can be detachably connected with the balance beam 1. Two third mounting holes 33 are used in the assembling process of the hoisting system, so that each pulley block 3 is fixedly mounted by using 2 second pin shafts 6, the pulley blocks 3 cannot topple over, and a steel wire rope is convenient to mount. The two holes for preventing toppling during installation are holes at the two extreme ends of the balance beam 1. In the inclined state of the balance beam 1, the two third mounting holes 33 are not completely overlapped with the second mounting holes 13 of the balance beam 1, as shown in fig. 6, and the holes at the extreme ends of the left and right sides are not completely overlapped, as shown in C, D. In the hoisting process, only one third mounting hole 33 is used, so that the pulley block 3 can work normally.

In some embodiments, one of the third mounting holes 33 is located on the vertical centerline L2 of the pulley block 3, and the other third mounting hole 33 is located near the vertical centerline L2. Wherein the pulleys of the pulley block 3 are symmetrical with respect to the vertical centre line L2.

According to the technical scheme, the structure of the lifting system can be changed by disassembling and assembling the pulley blocks 3 and changing the positions of the pulley blocks 3, and the number, the positions and the rope winding mode of the pulley blocks 3 determine the lifting weight of the lifting system. Namely the utility model discloses technical scheme can realize that the lifting hook parameter can change, and then satisfies the different demands that lift by crane, has reduced product cost to stronger operating mode adaptability has.

One specific embodiment is described below.

The double-winch lifting system adopts a split pulley block 3 to balance the lifting hook, namely the lifting system comprises two winches and two pulley blocks 3. As shown in fig. 1, the hook head 2 is mounted on the balance beam 1 through a first pin 5, the two pulley blocks 3 are mounted on the balance beam 1 through a second pin 6, and the middle parts or the upper parts of the first pulley block 31 and the second pulley block 32 are connected together through the connecting piece 4, and the first pulley block 31 and the second pulley block 32 are spaced from each other by a large distance. The balance beam 1, the connecting element 4 and the first pulley block 31 and the second pulley block 32 form a hinged rectangle, namely a deformable four-bar linkage structure.

The rope winding mode of the two pulley blocks 3 of the double-winding hoisting system is described below.

Referring to fig. 5, the first wire rope 7 is used to wind the first pulley block 31. Specifically, one end of the first wire rope 7 away from the first winch is wound around the movable sheave 311 of the first pulley block 31 and the fixed sheave 312 of the first pulley block 31. The second wire rope 8 is used to wind the second pulley block 32. Specifically, one end of the second wire rope 8 away from the second winch is wound around the movable sheave 321 of the second pulley block 32 and the fixed sheave 322 of the second pulley block 32.

Referring to fig. 6, when the first winding and the second winding are not synchronized, that is, the first winding and the second winding are not at the same speed, the heights of the movable pulleys 311 and 321 of the first pulley block 31 and the second pulley block 32 are different, so that a parallelogram is formed, but the first pulley block 31 and the second pulley block 32 are still horizontal. The angle change of the first steel wire rope 7 entering the first pulley block 31 is small, and the angle change of the second steel wire rope 8 entering the second pulley block 32 is small, so that the asynchronous inclusion of the double winches by the hoisting system is realized. From the above analysis, it can be seen that, in the lifting system with the double-winch balance hook, the distance between the first pulley block 31 and the second pulley block 32 is large, the height difference between the first pulley block 31 and the second pulley block 32 is also large when the balance beam 1 inclines at the same angle, the allowable length difference between the steel wire ropes of the first winch and the second winch is also large, and therefore the double-winch asynchronous compatibility is also large.

The dual hoist lifting system described above can be combined to convert to 3 single hoist unbalanced lifting hooks. When the double-winch lifting system is converted into the single pulley block 3 lifting hook, the single pulley block 3 can be installed in the middle of the balance beam 1 or at one end of the balance beam 1. When the single roll is lifted, a single-winch unbalanced lifting hook is adopted.

Referring to fig. 2 and 7, the first is to remove the connecting member 4 of fig. 1 and move the first pulley block 31 and the second pulley block 32 toward the middle and fix them, forming a single-winch unbalanced hook as shown in fig. 7. In fig. 2 and 7, the hook head 2 is mounted on the balance beam 1 through a first pin 5, and the first pulley block 31 and the second pulley block 32 are mounted on the balance beam 1 through two second pins 6, respectively. The distance between the first pulley block 31 and the second pulley block 32 is small, so that the overlarge angle of the steel wire rope entering the pulley is avoided. The rope winding mode is shown in fig. 7, and the same steel wire rope is adopted to wind around the first pulley block 31 and the second pulley block 32.

Referring to fig. 3 and 8, the second is to remove the connecting member 4 and the first pulley block 31 in fig. 1 and move the second pulley block 32 towards the middle and fix it, forming a second single hoisting unbalanced hook as shown in fig. 3. As shown in fig. 3, the hook head 2 is mounted on the balance beam 1 through a first pin 5, and the second pulley block 32 is mounted on the balance beam 1 through two second pins 6. The roping thereof is shown in fig. 8.

Referring to fig. 4, the third method is to remove the connecting member 4 and the second pulley block 32 in fig. 1, and directly form a single-winch unbalanced hook as shown in fig. 4. As shown in fig. 4, the hook head 2 is mounted on the balance beam 1 through a first pin 5, and the first pulley block 31 is mounted on the balance beam 1 through a second pin 6. In order to prevent the first pulley block 31 from rotating during the installation process, two second pins 6 are respectively installed in the two third installation holes 33. When the hoisting system is in a use state, the second pin shaft 6 in one of the third mounting holes 33 is removed, and only the second pin shaft 6 in the third mounting hole 33 on the vertical center line of the first pulley block 31 is reserved, so that the first pulley block 31 can normally work in the hoisting process. The rope winding mode is the same as the rope winding mode of the single-winch unbalanced lifting hook shown in the figure 8.

It should be noted that the second pulley block 32 is similar to the first pulley block 31 in structure and includes two third mounting holes 33. In the installation process, the second pin shaft 6 is installed in each of the two third installation holes 33. However, during the lifting process, only the second pin shaft 6 in the third mounting hole 33 on the vertical center line of the second pulley block 32 is remained.

Fig. 2, 3, 4, 7, and 8 are examples only. The embodiment of the utility model provides a play to rise system's transform kind also can be more than 3 kinds, and assembly pulley 3 also can be more than 2, and the pulley quantity that 3 contained of every assembly pulley is unrestricted yet. The connecting piece 4, the pulley block 3 and the balance beam 1 can be connected by a pin shaft or a bolt. The dismouting of round pin axle can use artifical dismouting, also can use power dismouting, like hydraulic power dismouting. The number of the fixed pin shafts connected with the pulley block 3 can be more than 2. It should be further noted that the embodiment of the present invention is not limited to the lifting hook combination and conversion based on the double-hoisting balanced lifting hook of fig. 1, and also can be the lifting hook combination and conversion based on the single-hoisting unbalanced lifting hook of fig. 2, at this time, the leftmost 2 holes and the rightmost 2 holes of the upper end of the balance beam 1 of fig. 2 can be cancelled, that is, the holes corresponding to the letters a and e of fig. 10 can be cancelled.

The pulley block 3 adopted in the above embodiments is structured as shown in fig. 9, where a is a position where the pulley block 3 and the balance beam 1 are connected and stressed, and is located at a longitudinal center line of the pulley block 3, so that the stress on the pulley block 3 is substantially balanced. And B is an installation positioning hole of the pulley block 3 to prevent the pulley block 3 from toppling over during installation. The attachment holes 35 keep the 2 pulley blocks 3 substantially parallel by means of the mounting links 4.

Referring to fig. 10, the hook head 2 is mounted at the longitudinal center line of the balance beam 1 through a first pin 5, and the letters a, b, c, d, and e are respectively 5 positions where the pulley block 3 is mounted. Letters a and e are 2 pulley block 3 installation positions of the double-winch balance lifting hook, the two pulley block 3 installation positions are symmetrically arranged along the longitudinal central line of the balance beam 1, and the distance and the width of the fixed pulley block 3 are considered in a whole mode and are as large as possible, so that the asynchronous inclusion of the double winches is improved. Letters b and d are installation positions of 2 pulley blocks 3 of the single-winch unbalanced lifting hook illustrated in fig. 2 and 7, the installation positions are symmetrically arranged on a longitudinal central line of the balance beam 1, and the distance and the width of the fixed pulley block 3 are considered integrally and are reduced as much as possible, so that the angle of the steel wire rope entering the pulley is reduced. The letter c is the mounting position of the pulley block 3 of the single-winch unbalanced lifting hook shown in fig. 3, and 3 holes are formed so as to conveniently mount any one pulley block 3. And the letter a indicates the mounting position of the pulley block 3 of the single-winch unbalanced lifting hook III shown in the figure 4.

The lifting system provided by the technical scheme is a multi-combination lifting hook, and on the structure of a basic lifting hook, various lifting hooks are combined by changing the position and/or the number of the pulley block 3, so that one hook is multipurpose, and the requirements of double-winch lifting, single-winch lifting and different tonnages can be met respectively. For example: the 400-ton double-winch balance lifting hook can be used for lifting 400 tons of double winches; on the basis of a 400-ton double-winch balanced lifting hook, a single-winch unbalanced lifting hook is formed by changing the positions of 2 pulley blocks 3, and can be used for single-winch lifting with the lifting capacity of more than 200 tons but less than 400 tons. A single pulley block 3 is utilized to form a single pulley block 3 unbalanced lifting hook, and the single-winch lifting hook can be used for single-winch lifting with the lifting capacity of not more than 200 tons. Above-mentioned technical scheme can convert into multiple lifting hook through the combination of difference to a basis lifting hook, and need not produce multiple lifting hook, has practiced thrift product cost. In addition, when combination and conversion are carried out on the basic lifting hook, additional devices such as the pulley block 3 and the like do not need to be added, and compared with the prior art, the cost is reduced. When the lifting system is used as a double-winch balance lifting hook, the distance between the pulley blocks 3 can be increased, and the asynchronous inclusion of the double winches is stronger. And the assembly and disassembly of the pulley block 3 are very convenient, and the conversion efficiency is high.

An embodiment of the utility model provides an engineering machine tool is still provided, include the utility model discloses the system that plays to rise that arbitrary technical scheme provided.

In some embodiments, the work machine comprises a crane.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the scope of the present invention.

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 it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: it is to be understood that modifications may be made to the above-described arrangements in the embodiments or equivalents may be substituted for some of the features of the embodiments, but such modifications or substitutions do not depart from the spirit and scope of the present invention.

Claims (11)

1. A hoist system, comprising:

the balance beam (1) comprises a body (11), and a first mounting hole (12) and a second mounting hole (13) which are arranged on the body (11), wherein the second mounting holes (13) are arranged in a row;

the hook head (2) is connected with the first mounting hole (12); and

the pulley block (3) is selectively arranged on part of the second mounting holes (13).

2. A hoisting system as claimed in claim 1, wherein the first mounting hole (12) is provided at the bottom of the balance beam (1) and the second mounting hole (13) is provided at the top of the balance beam (1).

3. The hoist system of claim 1, further comprising:

and the connecting piece (4) is connected with one end of the pulley block (3) far away from the balance beam (1).

4. A hoisting system as claimed in claim 3, characterized in that the number of pulley blocks (3) is two, and that both ends of the pulley blocks (3) remote from the compensating beam (1) are connected to the connecting element (4); and steel wire ropes are respectively wound on the two pulley blocks (3).

5. Hoisting system according to claim 4, characterized in that the pulley block (3) is provided with a connecting portion (34), which connecting portion (34) is provided with a connecting hole (35), which connecting hole (35) is connected with the connecting element (4).

6. Hoisting system according to claim 1, characterized in that the number of pulley blocks (3) comprises two, the wire rope wound on each pulley block (3) being connected in series.

7. Hoisting system according to claim 1, characterized in that the hook head (2) is connected to the first mounting hole (12) by a first pin (5); and/or the pulley block (3) is connected with the second mounting hole (13) through a second pin shaft (6).

8. Hoisting system according to claim 1, characterized in that the pulley block (3) is provided with two third mounting holes (33) and that both third mounting holes (33) are detachably connectable to the compensating beam (1).

9. A hoisting system as claimed in claim 8, wherein one of the third mounting holes (33) is located on a vertical centre line of the pulley block (3) and the other of the third mounting holes (33) is located adjacent the vertical centre line; wherein each of the pulleys of the pulley block (3) is symmetrical with respect to the vertical centre line.

10. A construction machine comprising a hoist system as claimed in any one of claims 1 to 9.

11. A working machine according to claim 10, characterized in that the working machine comprises a crane.

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