CN115367638A - Turntable mechanism and operation machine - Google Patents

Abstract

The disclosure relates to a turntable mechanism and an operating machine. The turntable mechanism is used to connect with the operating machine, comprising: a turntable (1), rotatably arranged on a chassis (21) of the operating machine; and an adapter device (3), It is detachably connected with the turntable (1); wherein, the adapter device (3) has one or more first connection positions (31) for detachable connection with the luffing device (22) of the working machine ground connection, the first connection position (31) is set on the upper end surface of the transfer device (3), the first connection position (31) is vertically higher than that of the turntable (1) upper end face.

Description

A turntable mechanism and working machine

technical field

The present disclosure relates to the field of working machines, in particular to a turntable mechanism and working machines.

Background technique

In order to meet the hoisting demand for super-large equipment in domestic petroleum, petrochemical, nuclear power, wind power, steel and other large-scale engineering projects, cranes have developed into super-large, with higher lifting heights, larger working ranges, and stronger lifting capabilities. Large crawler cranes have a combination of multiple booms to achieve various lifting heights and lifting ranges to meet the needs of various construction occasions. As the length of the boom increases and the weight increases, the boom process is more dangerous, and the boom process of the crawler crane is a necessary process for the crawler crane to enter the working state, so the boom process of the arm is also an important factor limiting the length of the boom.

Contents of the invention

The inventor found through research that the greater the amplitude-changing force of the crane in the related art when lifting the boom, the greater the axial component force of the arm, which makes the stability of the arm structure worse. The pull plate, steel wire rope, and mechanism selection are larger, which increases the cost and weight of the whole vehicle.

In view of this, the embodiments of the present disclosure provide a turntable mechanism and a work machine, which can improve the amplitude-changing force of the work machine.

In one aspect of the present disclosure, a turntable mechanism for connecting with a work machine is provided, comprising:

a swivel table rotatably disposed on the chassis of the work machine; and

An adapter device is detachably connected to the turntable;

Wherein, the adapter device has one or more first connection positions for detachably connecting with the luffing device of the working machine, the first connection position is arranged on the upper end surface of the adapter device, and the first connection position is in the vertical direction It is higher than the upper end face of the turntable.

In some embodiments, the upper end surface of the turntable has one or more second connection positions, and the transition device is detachably connected to the luffing device through the first connection position and/or the second connection position.

In some embodiments, the turntable mechanism further includes: a first counterweight;

The adapter device also has a third connection position, which is arranged on the side of the adapter device away from the turntable, and is used for detachably connecting with the first counterweight.

In some embodiments, the turntable mechanism further includes: a second counterweight;

The second counterweight is detachably connected with the turntable.

In some embodiments, there is an annular connecting ear at the third connecting position, and the first counterweight is hung on the connecting ear.

In some embodiments, the turntable mechanism also includes: a super-lifting and moving device;

The transfer device is detachably connected with the super-lifting pushing device through the third connection position.

In some embodiments, the transition device has a fourth connection position for connecting with the tail end of the turntable.

In some embodiments, the transition device includes a truss structure or a box structure.

In some embodiments, a plurality of first connection positions are arranged at intervals along the length direction of the turntable.

In another aspect of the present disclosure, a work machine is provided, including: any one of the above-mentioned turntable mechanisms.

In some embodiments, the luffing device of the working machine includes: a mast, a luffing jib, a first connecting piece and a second connecting piece;

The upper end surface of the turntable has one or more second connection positions, one end of the mast is rotatably connected to the turntable mechanism, and the other end of the mast is connected to the first connection position and/or the second connection position through the first connecting piece;

One end of the luffing jib is rotatably connected to the turntable mechanism, and the second connecting piece is connected between the other end of the luffing jib and the second end of the mast.

In some embodiments, the turntable mechanism includes a super-lifting and moving device, and the super-lifting and moving device includes: a first super-lifting jib frame, a second super-lifting jib frame, a first connecting member, and a second connecting member;

The first end of the first super-lifting jib is connected to the turntable, the second end of the first super-lifting jib is connected to one end of the luffing jib through a first connecting piece, and the second end of the first super-lifting jib is connected to the first end of the luffing jib. The second end of the mast is connected through a second connecting piece, and the second end of the first super-lifting jib is connected with the second end of the second super-lifting jib through a second connecting piece;

The transfer device also has a third connection position, which is arranged on the side of the transfer device away from the turntable, and the turntable mechanism also includes a first counterweight, the second end of the second super-lift jib is connected with the first counterweight, and the second The first end of the super-lift jib is connected to the third connection position.

In some embodiments, the first connecting part includes a pulley block and a steel wire rope, and the second connecting part includes a pull plate.

In some embodiments, the work machine includes a crane.

Therefore, according to the embodiment of the present disclosure, by setting the height of the first connection position on the adapter device higher than the upper end surface of the turntable, the moment arm of the horning force when the horning device is connected to the adapter device is larger. When the luffing moment required for lifting the boom is constant, the luffing force can be reduced, so that the luffing wire rope and luffing winch of the luffing system of the whole vehicle can match smaller selections, luffing pulley blocks, masts and other structural parts The required strength is lower and the weight is lighter, which can greatly reduce the cost and weight of the whole vehicle. In addition, under the same variable-amplitude force condition, the length of the jib can be longer or the weight of the jib can be heavier, thereby increasing the lifting height of the vehicle, achieving a larger working range and stronger lifting capacity .

Description of drawings

The accompanying drawings, which constitute a part of this specification, illustrate the embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.

The present disclosure can be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

Fig. 1 is according to the structural representation of the crawler crane in the related art;

Fig. 2 is a schematic structural diagram of a work machine according to some embodiments of the present disclosure;

(a) of FIG. 3 is a structural schematic diagram of the connection between the luffing mechanism of the working machine and the adapter device according to some embodiments of the present disclosure;

(b) of FIG. 3 is a structural schematic diagram of the connection between the luffing mechanism of the working machine and the turntable according to some embodiments of the present disclosure;

(c) of FIG. 3 is a structural schematic diagram of the connection between the luffing mechanism of the working machine, the adapter device and the turntable according to some embodiments of the present disclosure;

Fig. 4 is a schematic structural diagram of an adapter device according to some embodiments of the present disclosure;

(a) of FIG. 5 is a force analysis diagram of a working machine with variable amplitude force according to some embodiments of the present disclosure;

(b) of FIG. 5 is an analysis diagram of the overturning force of the working machine according to some embodiments of the present disclosure;

Fig. 6 is a schematic structural diagram of the connection between the working machine and the super-lifting and pushing device according to some embodiments of the present disclosure.

It should be understood that the sizes of the various parts shown in the drawings are not drawn according to the actual scale relationship. In addition, the same or similar reference numerals denote the same or similar components.

Detailed ways

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is illustrative only, and in no way restricts the disclosure, its application or uses. The present disclosure can be implemented in many different forms and is not limited to the embodiments described here. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that relative arrangements of parts and steps, compositions of materials, numerical expressions and numerical values set forth in these embodiments should be interpreted as illustrative only and not as limiting, unless specifically stated otherwise.

"First", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. Words like "comprising" or "comprising" mean that the elements preceding the word cover the elements listed after the word, and do not exclude the possibility of also covering other elements. "Up", "Down", "Left", "Right" and so on are only used to indicate the relative positional relationship. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

In the present disclosure, when it is described that a specific device is located between a first device and a second device, there may or may not be an intervening device between the specific device and the first device or the second device. When it is described that a specific device is connected to other devices, the specific device may be directly connected to the other device without an intervening device, or may not be directly connected to the other device but has an intervening device.

All terms (including technical terms or scientific terms) used in the present disclosure have the same meaning as understood by one of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in, for example, general-purpose dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in idealized or extremely formalized meanings, unless explicitly stated herein Defined like this.

Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods and devices should be considered part of the description.

Fig. 1 is a schematic structural diagram of a crawler crane in the related art, a mast 221a is connected to a turntable 1a through a first connecting piece 223a, and a luffing jib 221a is connected to the mast 221a through a second connecting piece 224a. Fig. 5(a) is a stress analysis diagram of the working machine according to some embodiments of the present disclosure, and Fig. 5(b) is a diagram of the overturning force of the working machine according to some embodiments of the present disclosure. Referring to Fig. 1 and (a) and (b) of Fig. 5, the pull plate force of the crawler crane in the related art is shown as F _b in the figure, the distance from the hinge point of the luffing jib frame 222a and the slewing table 1a to the pull plate That is, the force arm of the pulling force is L _b , and the moment M _b generated by pulling the plate = F _b *L _b . The gravity of the luffing jib 222a is G, the distance from its center of gravity to the hinge point between the slewing table 1a and the luffing jib 222a is L _g , and the moment M _g generated by the gravity of the luffing jib 222a =G*L _g . If the moment generated by the tie plate itself is ignored, M _b >M _g is required, that is, the moment of the tie plate is greater than the moment generated by the self-weight of the luffing jib frame 222a to meet the boom lifting condition.

The moment of the tension plate is provided by the torque of the luffing system, so if a larger tension moment is required, the luffing moment of the vehicle system will also increase accordingly. The luffing force from the mast to the luffing pulley assembly is F ₁ , the moment arm from the connection hinge point between the mast and the turntable 1a to the luffing wire rope is L ₁ , and the luffing moment M ₁ =F ₁ *L ₁ . Therefore, when a large crawler crane has an ultra-long arm length, the amplitude-changing force is greater when the boom is raised, and the axial component force of the boom is larger, which makes the stability of the boom structure worse; at the same time, the greater the amplitude-changing force, the In the luffing system, the pull plate, steel wire rope, and mechanism selection are larger, which increases the cost and weight of the whole vehicle.

Therefore, improving the magnitude of the luffing force of the luffing system during the lifting process of crawler cranes and reducing the cost and weight of the whole vehicle are the inevitable development trends of large crawler cranes, and are also the development needs of crawler cranes for lifting height, range and hoisting weight.

In view of this, referring to FIG. 2 to FIG. 5 (a), in one aspect of the embodiment of the present disclosure, a turntable mechanism is provided for connecting with a working machine, including: a turntable 1 and an adapter device 3, a turntable 1 is rotatably arranged on the chassis 21 of the working machine, and the adapter device 3 is detachably connected with the turntable 1. The adapter device 3 has one or more first connection positions 31 for detachably connecting with the luffing device 22 of the working machine. The first connection positions 31 are arranged on the upper end surface of the adapter device 3 . It is higher than the upper end surface of the turntable 1 in the vertical direction.

Referring to (a) of Figure 5, when the luffing device 22 is connected to the turntable 1, the luffing force between the mast 221 and the luffing pulley block is F ₁ , and the luffing force between the mast 221 and the luffing pulley block is F ₁ , The distance from the hinge point of the mast 221 and the turntable 1 to the luffing force F ₁ is L ₁ , and at this time the luffing moment M ₁ =F ₁ *L ₁ . When the _luffing device 22 is connected to the first connection position 31 of the adapter device 3, the luffing force between the mast 221 and the luffing pulley block is F ₂ The distance is L ₂ , and the luffing torque at this time is M ₂ =F ₂ *L ₂ .

In this embodiment, by setting the height of the first connection position 31 on the adapter device 3 to be higher than the upper end surface of the turntable 1, the hinge point of the luffing device 22 when connecting the adapter device 3 reaches the luffing force _F2 The distance L ₂ >L ₁ , when the luffing torque required for raising the arm is constant, F ₂ <F ₁ , so when the luffing device 22 is connected with the adapter device 3, the luffing force can be made smaller, so that the whole The luffing steel wire rope and luffing winch of the vehicle luffing system can match smaller selections, and the luffing pulley blocks, masts and other structural components require lower strength and lighter weight, which can greatly reduce the cost and weight of the entire vehicle. In addition, under the same variable-amplitude force condition, the length of the jib can be longer or the weight of the jib can be heavier, thereby increasing the lifting height of the vehicle, achieving a larger working range and stronger lifting capacity .

Referring to Fig. 2, (a), (b) and (c) of Fig. 3, in some embodiments, the upper end surface of the turntable 1 has one or more second connection positions 32, and the adapter device 3 is connected through the first The location 31 and/or the second connection location 32 are detachably connected to the luffing device 22 . In this embodiment, the turntable mechanism can be flexibly connected to the first connection position 31 and/or the second connection position 32 according to the actual working situation, and has strong adaptability to different working conditions, thereby further optimizing the luffing of the working machine Force, so that the turntable mechanism has a greater working range and lifting capacity.

With reference to Fig. 2, Fig. 3 and (b) of Fig. 5, in some embodiments, the turntable mechanism further includes: a first counterweight 41, and the transfer device 3 also has a third connection position 33, which is arranged at a distance from the transfer device 3 One side of the turntable 1 is used for detachably connecting with the first counterweight 41 .

Since the longer the arm length of the crane, the greater the anti-tipping moment required, and the correspondingly more counterweights and weights need to be matched, thus increasing the cost and weight of the whole vehicle. The weight is less, resulting in the need to repeatedly disassemble and assemble the weight during the use of the ultra-long boom, which is less efficient.

Referring to (b) of FIG. 5 , the gravity of the luffing jib 222 is G, the distance from the center of gravity of the luffing jib 222 to the hinge point of the turntable 1 is L _g , and the overturning moment M _f generated by the jib = G*L _g , the gravity of the first counterweight 41 is G _p1 , the distance from the first counterweight 41 to the hinge point between the turntable 1 and the chassis 21 is L _p1 , and the anti-overturning moment M _p1 =G _p1 * generated by the first counterweight 41 L _p1 . The turntable mechanism can also include a self-contained second counterweight 42, the gravity of the second counterweight 42 is G _p2 , the distance from the second counterweight 42 to the pivot point between the turntable 1 and the chassis 21 is L _p2 , and the second counterweight The anti-overturning moment M _p2 generated by 42 =G _p2 *L _p2 .

In this embodiment, the third connection position 33 that is detachably connected to the first counterweight 41 is provided on the side of the adapter device 3 away from the turntable 1, so that the first counterweight 41 is connected to the hinge between the turntable 1 and the chassis 21. The distance L _p1 of the point is greater than the distance L _p2 from the second counterweight 42 to the pivot point between the turntable 1 and the chassis 21, so that the first counterweight 41 can generate a larger anti-overturning moment, improve the stability of the operating machine, and increase The length or weight of the boom can be adjusted to increase the lifting height of the vehicle, so that the working range of the operating machinery is larger and the lifting capacity is stronger. In addition, under the condition of the same length and weight of the jib, the weight of the counterweight can be reduced, the efficiency of disassembly and assembly of the weight can be improved, and the cost of the whole vehicle can be reduced.

Referring to Fig. 2, Fig. 3 and (b) of Fig. 5, in some embodiments, it also includes: a second counterweight 42, and the turntable 1 is detachably connected with the first counterweight 41 and/or the second counterweight 42 . In this embodiment, the turntable mechanism can flexibly choose to be connected with the first counterweight 41 and/or the second counterweight 42 according to the actual working situation. When the turntable mechanism is connected with the first counterweight 41 and the second counterweight 42 at the same time, The anti-overturning moment is M _p1 +M _p2 , which makes the whole vehicle more stable, allows the use of longer or heavier booms, and improves the working range and lifting capacity.

Referring to FIG. 4 , in some embodiments, the third connection position 33 has an annular connection ear, and the first counterweight 41 is hung on the connection ear. In this embodiment, the first counterweight 41 is dropped or suspended in the ring-shaped connection ear of the third connection position 33, which can improve the efficiency of disassembling and assembling the weight.

Referring to FIG. 6 , in some embodiments, it further includes: a super-lifting and moving device, and the adapter device 3 is detachably connected to the super-lifting and moving device through a third connection position 33 . In this embodiment, under the super-lifting working condition, the super-lifting and pushing device can be connected with the third connection position 33 or connected with the turntable 1, and the super-lifting and moving range when the super-lifting and pushing device is connected with the turntable 1 is L _C1 , when connecting with the third connection position 33, the overlifting range is L _C2 , since L _C2 >L _C1 , when the overlifting device is connected with the adapter device 3, the anti-overturning moment of the whole vehicle and the stability of the whole vehicle can be improved .

Referring to FIG. 4 , in some embodiments, the adapter device 3 has a fourth connection position 34 for connecting with the rear end of the turntable 1 , and the connection method includes but not limited to pin hinged. In this embodiment, the adapter device 3 is connected to the turntable 1 through the fourth connection position 34, which is convenient for disassembly and assembly.

Referring to FIG. 4 , in some embodiments, the transition device 3 includes a truss structure or a box structure. In this embodiment, the adapter device 3 can be composed of two parallel flat plates, there is enough space between the two flat plates, and the lower surface of the flat plates is an inclined plane, so as to avoid interference with the connected counterweight or super-lifting moving device. collision.

In some embodiments, a plurality of first connection positions 31 are arranged at intervals along the length direction of the turntable 1 . In this embodiment, a plurality of first connection positions 31 can be set on the adapter device 3, so as to adjust the variable amplitude force by adjusting the connection positions with the adapter device 3 according to actual working conditions, and optimize the cost and weight of the whole vehicle.

Referring to FIG. 2 , in another aspect of the embodiments of the present disclosure, a work machine is provided, including: any one of the above-mentioned turntable mechanisms. Under the condition that the arm length and arm weight of the luffing jib 222 are the same, the working machine in this embodiment can effectively reduce the luffing force of the luffing jib and the axial force of the jib, and improve the loss resistance of the luffing jib 222. The stability ability can reduce the steel wire rope and luffing winch selection parameters of the luffing system of the whole vehicle, reduce the strength and weight of structural parts such as the mast 221 and the luffing pulley block, and reduce the weight of the vehicle and greatly reduce the cost. In addition, under the same lifting height, operating range and hanging weight, it can increase the anti-overturning moment of the whole vehicle, improve the stability of the whole machine, and provide support for the rotary operation of the working machine.

Referring to FIG. 2 , in some embodiments, the luffing device 22 of the working machine includes: a mast 221 , a luffing jib 222 , a first connecting member 223 and a second connecting member 224 . The upper end surface of the turntable 1 has one or more second connection positions 32, one end of the mast 221 is rotatably connected with the turntable mechanism, and the other end of the mast 221 is connected to the first connection position 31 and/or the second connection position 32 through the first connection position 32. One connecting piece 223 is connected, one end of the luffing jib 222 is rotatably connected with the turntable mechanism, and the second connecting piece 224 is connected between the other end of the luffing jib 222 and the second end of the mast 221 .

In this embodiment, the luffing jib frame 222 includes, but is not limited to, a space truss high-strength steel pipe welded structure, and has a corresponding tie plate bracket, which is used for placing and fixing the tie plate to prevent the tie plate from colliding with the structural parts. Friction can effectively avoid damage to the pull plate and corresponding structural parts.

Referring to Fig. 6, in some embodiments, the turntable mechanism includes a super-lifting and moving device, and the super-lifting and moving device includes: a first super-lifting jib frame 51, a second super-lifting jib frame 52, a first connecting member 223 and a second connecting member 224. The first super-lifting jib 51 is composed of two arms, and the folding angle between the two arms is adjustable. The first end of the first super-lifting jib 51 is connected to the turntable 1. The first super-lifting jib 51 The second end of the luffing jib 222 is connected with one end of the luffing jib 222 through the first connecting piece 223, the second end of the first super-lifting jib 51 is connected with the second end of the mast 221 through the second connecting piece 224, and the first super-lifting The second end of the jib 51 is connected to the second end of the second super-elevating jib 52 through a second connecting piece 224 .

The adapter device 3 also has a third connection position 33, which is arranged on the side of the adapter device 3 away from the turntable 1. The turntable mechanism also includes a first counterweight 41, and the second end of the second super-lift arm frame 52 is connected to the first The counterweight 41 is connected, and the first end of the second super-lift boom 52 is connected to the third connection position 33 .

In this embodiment, under the super-lifting working condition of the working machine, the super-lifting and pushing device can also be connected through the adapter device 3, so as to realize a larger super-lifting and pushing range, increase the anti-overturning moment of the whole vehicle, and improve the stability of the whole vehicle. Simultaneously, the overlifting and pushing device can also be connected to the turntable 1 according to the performance of the whole vehicle, so as to solve the possibility of the rearward tipping of the whole vehicle and improve the stability of the whole vehicle when the whole vehicle needs a small anti-overturning moment.

In some embodiments, the first connecting part 223 includes a pulley block and a wire rope, and the second connecting part 224 includes a pull plate. In this embodiment, the first connecting member 223 can be realized by a pulley block and a wire rope, and the length can be flexibly adjusted. The second connecting member 224 can be realized by a pull plate, which includes but is not limited to a bendable connecting member.

In some embodiments, the work machine includes a crane. In this embodiment, the crane includes but is not limited to a crawler crane, and the turntable mechanism is installed on the crawler chassis.

So far, the embodiments of the present disclosure have been described in detail. Certain details known in the art have not been described in order to avoid obscuring the concept of the present disclosure. Based on the above description, those skilled in the art can fully understand how to implement the technical solutions disclosed herein.

Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art should understand that the above examples are for illustration only, rather than limiting the scope of the present disclosure. Those skilled in the art should understand that the above embodiments can be modified or some technical features can be equivalently replaced without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims (14)

1. A turret mechanism for connection with a work machine, comprising:

a revolving platform (1) which is rotatably arranged on a chassis (21) of the working machine; and

the switching device (3) is detachably connected with the rotary table (1);

wherein the adapter device (3) has one or more first connecting positions (31) for detachable connection to a luffing device (22) of the working machine, wherein the first connecting positions (31) are arranged at an upper end face of the adapter device (3), and wherein the first connecting positions (31) are vertically higher than an upper end face of the rotary table (1).

2. Turntable mechanism according to claim 1, characterized in that the upper end face of the turntable (1) has one or more second connection locations (32), the adapter means (3) being detachably connected to the luffing means (22) via the first connection location (31) and/or the second connection location (32).

3. The turntable mechanism of claim 1, further comprising: a first counterweight (41);

the switching device (3) further comprises a third connecting position (33) which is arranged on one side of the switching device (3) far away from the rotary table (1) and is used for being detachably connected with the first balance weight (41).

4. The turntable mechanism of claim 3, further comprising: a second counterweight (42);

the second counterweight (42) is detachably connected with the rotary table (1).

5. Turntable mechanism as claimed in claim 3, characterized in that at the third connecting location (33) there is an annular coupling lug at which the first counterweight (41) is suspended.

6. The turntable mechanism of claim 3, further comprising: a super lift pushing device;

the adapter device (3) is detachably connected to the extension pushing device via the third connecting point (33).

7. Turntable mechanism as claimed in claim 1, characterized in that said adapter means (3) has a fourth connection location (34) for connection with the rear end of said turntable (1).

8. Turntable mechanism as claimed in claim 1, characterized in that the adapter means (3) comprise a truss structure or a box structure.

9. Turntable mechanism according to claim 1, characterized in that a plurality of said first connection locations (31) are provided at intervals along the length of said turntable (1).

10. A work machine, comprising:

a turntable mechanism as claimed in any one of claims 1 to 9.

11. The work machine according to claim 10, wherein the amplitude device (22) of the work machine comprises: the device comprises a mast (221), a luffing jib (222), a first connecting piece (223) and a second connecting piece (224);

the upper end face of the revolving platform (1) is provided with one or more second connecting positions (32), one end of the mast (221) is rotatably connected with the rotary table mechanism, and the other end of the mast (221) is connected with the first connecting position (31) and/or the second connecting position (32) through the first connecting piece (223);

one end of the amplitude changing arm support (222) is rotatably connected with the rotary table mechanism, and the second connecting piece (224) is connected between the other end of the amplitude changing arm support (222) and the second end of the mast (221).

12. The work machine of claim 11, wherein said turret mechanism includes a superlift pusher jack, said superlift pusher jack comprising: a first super-lift arm support (51), a second super-lift arm support (52), the first connector (223), and the second connector (224);

the first end of the first super-lift arm support (51) is connected with the rotary table (1), the second end of the first super-lift arm support (51) is connected with one end of the luffing arm support (222) through a first connecting piece (223), the second end of the first super-lift arm support (51) is connected with the second end of the mast (221) through a second connecting piece (224), and the second end of the first super-lift arm support (51) is connected with the second end of the second super-lift arm support (52) through a second connecting piece (224);

the switching device (3) is further provided with a third connecting position (33) and arranged on one side, far away from the rotary table (1), of the switching device (3), the rotary table mechanism further comprises a first balance weight (41), the second end of the second super-lifting arm support (52) is connected with the first balance weight (41), and the first end of the second super-lifting arm support (52) is connected with the third connecting position (33).

13. The work machine according to claim 11 or 12, characterized in that the first connection (223) comprises a block and tackle and a wire rope and the second connection (224) comprises a pulling plate.

14. The work machine of claim 10, wherein said work machine comprises a crane.

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