CN116495643A - Crane boom, crane and crane boom lifting method - Google Patents

Abstract

The invention discloses a crane boom, a crane and a crane boom lifting method, and relates to the field of cranes, wherein the crane boom lifting method is used for reducing the cost of the crane boom. The boom includes: a main arm including a first end and a second end; a tower arm including a third end and a fourth end; the third end is rotatably connected with the second end of the main arm; the first bracket is rotatably connected with the second end of the main arm; the second bracket is rotatably connected with the third end of the tower arm; the first pulling plate is arranged between the main arm and the first bracket; the second pulling plate is arranged between the tower arm and the second bracket; one end of the first backward tilting prevention assembly is rotatably connected with the first bracket, and the other end of the first backward tilting prevention assembly is slidably connected with the main arm; the first anti-recline assembly is configured to be freely adjustable in length; the second backward tilting prevention assembly is rotatably connected with the second bracket, and the other end of the second backward tilting prevention assembly is slidably connected with the main arm; the amplitude-variable rope is wound between the first bracket and the second bracket. By the aid of the scheme, cost of the backward tilting prevention assembly is greatly reduced.

Description

Crane boom, crane and crane boom lifting method

Technical Field

The invention relates to the field of cranes, in particular to a crane boom, a crane and a crane boom lifting method.

Background

The running gear of crawler crane is crawler chassis, and it is the mechanical equipment that is used for lifting the heavy object to certain altitude. The crawler crane comprises a main arm, a tower arm, a rear bracket and a front bracket. The main arm is rotatably connected with the tower arm, the rear support is rotatably connected with the main arm, and the front support is rotatably connected with the tower arm. The top of the front bracket and the top of the rear bracket are connected by an amplitude-variable rope.

Under special environment and requirements, the working condition of the tower arm is needed to be used, and the auxiliary arm, the front support and the rear support of the tower arm are hinged with the arm head and the bottom joint arm through pin shafts. When the tower arm is installed under the working condition, when the arm support is not lifted, the rear support of the tower arm can topple backwards due to dead weight, and the rear support is supported by the backward tilting prevention mechanism; after the arm is lifted, because the auxiliary arm of the tower arm and the front support are heavy, the moment for overturning forwards is integrally generated, and at the moment, the rear support is influenced by the moment for overturning forwards and is forwards rotated, so that the rear pulling plate is tensioned, and the working state of the crane is achieved.

When the tower arm is lifted, the rear support is lifted from the inclination to a state approximately perpendicular to the horizontal plane by the auxiliary crane, and then the tower arm rear pulling plate is tensioned by the dead weight of the tower arm and the front support, so that the rear support is in a working state.

The inventors found that at least the following problems exist in the prior art: in the prior art, the backward tilting prevention mechanism adopts a telescopic oil cylinder, so that the purchase cost and the maintenance cost of the oil cylinder are high, and the maintenance difficulty is high.

Disclosure of Invention

The invention provides a crane boom, a crane and a crane boom lifting method, which are used for reducing the cost of the crane boom.

The embodiment of the invention provides a crane boom, which comprises:

a main arm including a first end and a second end;

a tower arm including a third end and a fourth end; the third end is rotatably connected with the second end of the main arm;

a first bracket rotatably connected to the second end of the main arm;

the second bracket is rotatably connected with the third end of the tower arm;

the first pulling plate is arranged between the main arm and one end, far away from the main arm, of the first bracket;

the second pulling plate is arranged between the tower arm and one end, far away from the tower arm, of the second bracket;

the first backward tilting prevention assembly is rotatably connected with the first bracket at one end and slidably connected with the main arm at the other end; the first anti-recline assembly is configured to be freely adjustable in length;

one end of the second backward tilting prevention assembly is rotatably connected with the second bracket, and the other end of the second backward tilting prevention assembly is slidably connected with the main arm; and

the amplitude-variable rope is wound between one end of the first bracket far away from the main arm and one end of the second bracket far away from the tower arm.

In some embodiments, the first anti-recline assembly and the second anti-recline assembly are identical in structure, each comprising:

one end of the sleeve is rotatably connected with the first bracket; and

the core tube, one end of the said core tube can nest in another end of the said sleeve slidably; the other end of the core tube is slidably connected with the main arm.

In some embodiments, one of the sleeve and the core tube is provided with an oblong hole, and the other is provided with a boss that cooperates with the oblong hole to define a range of relative sliding distances of the sleeve and the core tube.

In some embodiments, the outer wall of the main arm is provided with a first runner in which the other end of the core tube of the first anti-recline assembly is mounted.

In some embodiments, the first runner includes a first limit recess to limit a slip limit position of the other end of the core tube of the first anti-recline assembly.

In some embodiments, the outer wall of the main arm is provided with a second runner in which the other end of the core tube of the second anti-recline assembly is mounted.

In some embodiments, the second runner includes a second limit recess to limit a slip limit position of the other end of the core tube of the second anti-recline assembly.

The embodiment of the invention also provides a crane, which comprises: the invention provides a lifting arm according to any technical scheme.

The embodiment of the invention also provides a crane boom lifting method, wherein the crane boom is provided by any technical scheme of the invention, and the crane boom lifting method comprises the following steps:

lifting a first bracket so that the first bracket moves to a set position; wherein, during rotation of the first bracket relative to the main arm, the first anti-recline assembly slides along the main arm and rotates with the first bracket relative to the main arm;

lifting a second bracket so that the second bracket moves to a set position and the second pulling plate is pulled taut; wherein, during rotation of the second bracket relative to the tower arm, the second anti-recline assembly slides along the main arm;

the luffing rope is contracted until the first bracket, the second bracket and the second pulling plate are all tensioned; wherein the length of the first anti-recline assembly is automatically adjusted as the luffing rope contracts;

and continuously tightening the luffing rope until the first pulling plate is tightened.

According to the lifting arm provided by the technical scheme, the position of the first support is adjusted along with the shrinkage of the luffing rope before lifting the arm, so that the first support only needs to be adjusted by a small angle when being adjusted to the working position from the lifting arm position, the first support cannot turn forward too much, and the first support also means that the first support cannot slip too much when being prevented from backward tilting, so that the backward tilting prevention structure can not need to have too much length change, and smaller slip can be met through the schemes such as a slotted hole and the like. The technical scheme of the utility model adopts the first backward tilting prevention component of the mechanical structure to replace the oil cylinder, thereby greatly reducing the cost of the backward tilting prevention component and further reducing the cost of the crane arm.

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 embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:

fig. 1 is a schematic view of a state of a lifting arm (not shown as a first anti-recline assembly) before lifting the arm according to an embodiment of the present invention.

Fig. 2 is a schematic structural view of a first anti-recline assembly (a second anti-recline assembly) of a lift arm in a retracted state according to an embodiment of the present invention.

Fig. 3 is a schematic structural view of an extended state of a first anti-recline assembly (a second anti-recline assembly) of a crane arm according to an embodiment of the present invention.

Fig. 4 is a schematic diagram of a state in which a first pulling plate and a second pulling plate of a crane arm are straightened (a first backward tilting prevention assembly is not illustrated) according to an embodiment of the present invention.

Fig. 5 is a schematic view of a boom in place state of a boom according to an embodiment of the present invention.

Fig. 6 is a schematic diagram of a boom lifting method according to an embodiment of the present invention.

Reference numerals:

1. a main arm; 2. a tower arm; 3. a first bracket; 4. a second bracket; 5. a first pulling plate; 6. a first anti-recline assembly; 7. a second anti-recline assembly; 8. a luffing rope; 9. a second pulling plate;

61. a sleeve; 62. a core tube; 63. a slotted hole; 64. a boss; 65. a pin shaft;

11. a first chute; 12. a second chute; 1a, a first end; 1b, a second end; 2a, a third end; 2b, fourth end.

Detailed Description

The technical scheme provided by the invention is described in more detail below with reference to fig. 1 to 6.

Referring to fig. 1, an embodiment of the present invention provides a boom including a main arm 1, a tower arm 2, a first bracket 3, a second bracket 4, a first pulling plate 5, a first anti-recline assembly 6, and a second anti-recline assembly 7.

The main arm 1 comprises a first end 1a and a second end 1b. The main arm 1 adopts a truss arm structure or a box structure. The first end 1a of the main arm 1 is rotatably connected with the crane body, and the second end 1b of the main arm 1 is rotatably connected with the tower arm 2.

The tower arm 2 comprises a third end 2a and a fourth end 2b. The third end 2a is rotatably connected to the second end 1b of the main arm 1. The tower arm 2 is arranged at the second end 1b of the main arm 1, and the tower arm 2 and the main arm 1 are rotatably connected.

The first bracket 3 is rotatably connected to the second end 1b of the main arm 1. The second bracket 4 is rotatably connected to the third end 2a of the tower arm 2. The first bracket 3 and the second bracket 4 are positioned at the connection position of the main arm 1 and the tower arm 2. The first bracket 3 and the second bracket 4 can rotate relatively. When the boom is in an operating state, the first bracket 3 and the second bracket 4 are kept relatively static, and the first anti-backward tilting component 6 and the second anti-backward tilting component 7 which are described below together enable the boom to be kept in a set shape and height.

The first pulling plate 5 is arranged between the main arm 1 and the end of the first bracket 3 remote from the main arm 1. The second pulling plate 9 is arranged between the tower arm 2 and the end of the second bracket 4 remote from the tower arm 2. The first pull plate 5 and the second pull plate 9 are in a loose state in the original state, and after the arm is lifted, the first pull plate 5 and the second pull plate 9 are tensioned.

One end of the first anti-recline assembly 6 is rotatably coupled to the first bracket 3, and more particularly, rotatably coupled thereto by a pin 65. The other end of the first anti-recline assembly 6 is slidably connected to the main arm 1. The first anti-recline assembly 6 is configured to be freely adjustable in length. The first anti-recline assembly 6 is a mechanical structure, such as a sleeve 61 structure. The first backward tilting prevention assembly 6 does not adopt a structure such as an oil cylinder which needs to be externally connected with an oil source, an air source and the like. This eliminates the need for additional maintenance of the first anti-roll back assembly 6. And, the other end of the first backward tilting prevention component 6 is slidably connected with the main arm 1, and in the process that the first backward tilting prevention component 6 rotates along with the first bracket 3, one end of the first backward tilting prevention component 6 is hinged (specifically hinged through a pin shaft 65), and the other end of the first backward tilting prevention component is free to slide, so that the first backward tilting prevention component 6 cannot interfere with the rotation of the first bracket 3, and the amplitude of the first bracket 3 is smoother. After the first pulling plate 5 is basically in place, the first anti-backward tilting component 6 can be installed in place, and along with the subsequent arm lifting action, referring to fig. 2 and 3, the first anti-backward tilting component 6 can automatically move, rotate and stretch, and finally is automatically fixed at a set position, namely, is clamped in a first limiting groove which is described later.

Before the arm is lifted, the first bracket 3 does not reach the working state, so that the first backward tilting prevention assembly 6 cannot be stretched to the working state; after the arm is lifted, the first anti-backward tilting assembly 6 is turned forwards and tightens the first pulling plate 5 under the influence of the dead weights of the tower arm 2 and the second bracket 4, and at the moment, the first anti-backward tilting assembly 6 is stretched to a working state. It can be seen that the length of the first anti-recline assembly 6 needs to be changed before and after the arm is lifted, and thus the first anti-recline assembly 6 is designed to be a variable length structure.

One end of the second backward tilting prevention assembly 7 is rotatably connected with the second bracket 4, and the other end of the second backward tilting prevention assembly 7 is slidably connected with the main arm 1. The second anti-recline assembly 7 may be a ram or a mechanical structure, such as a sleeve type structure. The second anti-recline assembly 7 is purely mechanical and requires no additional maintenance.

In the related art, an auxiliary crane is adopted to lift the rear bracket to drive the rear pulling plate, and the rear bracket can turn forward for a larger angle in the arm lifting process, so that the tensioning degree of the rear pulling plate is low. By adopting the tensioning method of the scheme, the rear pulling plate can be tensioned to the greatest extent in the process of tensioning the luffing rope 8; and in the process of tightening the luffing rope 8, the position of the first bracket 3 is rotated to a position very close to the working state along with the luffing rope 8, so that in the subsequent boom lifting process of the boom, the position of the first bracket 3 can reach the working position only by very small adjustment, and the forward overturning angle of the first bracket is very small.

Further, since the first anti-recline assembly 6 is required to be supported between the first bracket 3 and the main arm 1, the first anti-recline assembly 6 is already installed in place before the arm is lifted, but if the first bracket 3 is turned forward (clockwise in fig. 1) after the arm is lifted, the first anti-recline assembly 6, which is originally installed, slides along the main arm 1. The first anti-recline assembly 6 will also slide only a short distance due to the small angle of forward tipping of the first bracket 3 during arm lifting. This makes the movement of the first anti-recline assembly 6 more controllable.

Referring to fig. 2, in some embodiments, the first anti-recline assembly 6 and the second anti-recline assembly 7 are identical in structure and different in length. The first anti-recline assembly 6 is longer than the second anti-recline assembly 7 due to the greater size of the location where the first anti-recline assembly 6 is mounted and the amount of displacement of the first anti-recline assembly 6. The first anti recline assembly 6 and the second anti recline assembly 7 each include a sleeve 61 and a core tube 62. One end of the sleeve 61 is rotatably connected to the first bracket 3; one end of the core tube 62 is slidably nested in the other end of the sleeve 61; the other end of the core tube 62 is slidably connected to the main arm 1.

Referring to fig. 2, in some embodiments, the wall of the sleeve 61 is provided with a first locking hole and the core tube 62 is correspondingly provided with a second locking hole. The pin shaft is inserted into the first locking hole and the second locking hole so that the sleeve 61 and the core tube 62 do not move axially relative to each other. When the sleeve 61 and the core tube 62 are required to move freely in the axial direction, the pin shaft is removed.

Referring to fig. 4, in some embodiments, one of the sleeve 61 and the core tube 62 is provided with an oblong hole 63, the other of which is provided with a boss 64, the boss 64 and the oblong hole 63 cooperating to define a range of relative sliding distances of the sleeve 61 and the core tube 62. By means of the cooperation of the oblong hole 63 and the projection 64, the sleeve 61 and the core tube 62 on the one hand can be automatically moved relative to each other, also in such a way that the range of relative movement is within a limited area.

The following describes the mating relationship of the first anti-recline assembly 6 and the main arm 1, and the mating relationship of the second anti-recline assembly 7 and the main arm 1, respectively.

The main arm 1 is provided with a first chute 11 and a second chute 12, and the positions of the first chute 11 and the second chute 12 are different so as to respectively correspond to the first backward tilting prevention assembly 6 and the second backward tilting prevention assembly 7. The slip direction of the first anti-recline assembly 6 is shown by arrow S1 in fig. 5 and the slip direction of the second anti-recline assembly 7 is shown by arrow S2 in fig. 1.

Referring to fig. 5, in some embodiments, the outer wall of the main arm 1 is provided with a first slide groove 11, and the other end of the core tube 62 of the first anti-recline assembly 6 is mounted in the first slide groove 11. The slip direction of the first anti-roll back assembly 6 is seen in the direction indicated by the arrow S1 in fig. 5. The other end of the core tube 62 is clamped in the first sliding groove 11, and during the process that the first anti-backward tilting component 6 rotates along with the first bracket 3, the other end of the core tube 62 of the first anti-backward tilting component 6 freely moves along the first sliding groove 11.

In some embodiments, the first runner 11 includes a first limit recess (not shown) to limit the slip limit position of the other end of the core tube 62 of the first anti-recline assembly 6.

Referring to the enlarged portion of fig. 1, in some embodiments, the outer wall of the main arm 1 is provided with a second runner 12, and the other end of the core tube of the second anti-recline assembly 7 is mounted in the second runner 12.

In some embodiments, the second runner 12 includes a second limit recess (not shown) to limit the slip limit position of the other end of the core tube of the second anti-recline assembly 7.

In some embodiments, the crane boom further comprises a luffing rope 8, the luffing rope 8 being wound between the end of the first support 3 remote from the main boom 1 and the end of the second support 4 remote from the tower boom 2.

Before the boom is lifted, the luffing rope 8 is wound around the ends of the first bracket 3 and the second bracket 4, and then the boom lifting operation is performed.

Specifically, the luffing rope 8 is wound on the pulley blocks at the tops of the first bracket 3 and the second bracket 4, and the approaching and the separating of the first bracket 3 and the second bracket 4 can be realized by tightening and loosening the luffing rope 8. The main arm 1 and the tower arm 2 are rotatably connected through a pin shaft; the second bracket 4 is connected with the tower arm 2 through a pin shaft; the main arm 1 and the first bracket 3 are connected through a pin shaft. The second anti-backward tilting component 7 is connected with the second bracket 4 through a pin shaft, and the other end of the second anti-backward tilting component can be propped against the main arm 1 and can be clamped at a set position. The two ends of the first pulling plate 5 are respectively connected with the main arm 1 and the first bracket 3; the two ends of the second pulling plate 9 are respectively connected with the second bracket 4 and the tower arm 2.

In the process of lifting the tower arm 2, the first support 3 rotates around the hinge point by tightening the luffing rope 8, so that the first pull plate 5 is tensioned, and the first support 3 is prevented from tilting backwards and is propped against the first support 3 to rotate backwards due to the effect of the first backward tilting prevention assembly 6, so that the first support 3 rotates forwards, and the purpose of tightening the backward pull plate is achieved.

The embodiment of the invention also provides a crane, which comprises: the invention provides a lifting arm according to any technical scheme.

Referring to fig. 6, an embodiment of the present invention further provides a boom lifting method, where the boom is a boom provided by any one of the embodiments of the present invention, and the boom lifting method includes the following steps:

step S100, lifting the first bracket 3 so that the first bracket 3 moves to a set position; wherein, during the rotation of the first bracket 3 relative to the main arm 1, the first anti-recline assembly 6 slides along the main arm 1 and rotates with the first bracket 3 relative to the main arm 1.

Step S200, lifting the second bracket 4 so that the second bracket 4 moves to a set position and the second pulling plate 9 is pulled taut; wherein the second anti-recline assembly 7 slides along the main arm 1 during rotation of the second bracket 4 relative to the tower arm 2.

Step S300, contracting the luffing rope 8 until the first bracket 3, the second bracket 4 and the second pulling plate 9 are tensioned; wherein the length of the first anti-roll back assembly 6 is then increased. By tightening the luffing rope 8 to tighten the first pulling plate 5, the first bracket 3 can be brought into the working state in advance.

In step S300, during the process of contracting the luffing rope 8, the first bracket 3 and the second bracket 4 both rotate relative to the main arm 1, and the rotation of the first bracket 3 and the second bracket 4 makes the first bracket 3 and the second bracket 4 closer to the positions corresponding to the working states of the crane arms. This achieves the adjustment of the position of the first bracket 3 before the arm raising operation in step S500, so that the position of the first bracket 3 does not change too much when the arm is raised in step S500, and accordingly, the first anti-recline assembly 6 connected to the first bracket 3 does not change too much in length. Therefore, the first anti-backward tilting component 6 can adopt a purely mechanical structure of the oblong hole to realize anti-backward tilting, and even if the first bracket 3 rotates along the anticlockwise direction shown in fig. 1, the first bracket 3 is not supported for a short time due to the limited length of the oblong hole, so that the adverse phenomenon of the first bracket 3 can not occur.

Step S400, the luffing rope 8 is continuously tensioned until the first pulling plate 5 is tensioned. The length of the first anti-roll back assembly 6 is automatically adjusted as the luffing line 8 contracts.

And S500, lifting the whole main arm 1 and the tower arm 2.

According to the technical scheme, the structural requirement on the first backward tilting prevention assembly 6 is reduced, and the first backward tilting prevention assembly 6 does not need too large length change in the whole arm lifting process, so that the backward tilting prevention structure of the first bracket 3 is simplified.

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," and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the protection of the present invention.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may be modified or some technical features may be replaced with others, which may not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (9)

1. A boom, comprising:

a main arm (1) comprising a first end (1 a) and a second end (1 b);

a tower arm (2) comprising a third end (2 a) and a fourth end (2 b); the third end (2 a) is rotatably connected with the second end (1 b) of the main arm (1);

a first bracket (3) rotatably connected to the second end (1 b) of the main arm (1);

a second bracket (4) rotatably connected to the third end (2 a) of the tower arm (2);

the first pulling plate (5) is arranged between the main arm (1) and one end of the first bracket (3) far away from the main arm (1);

the second pulling plate (9) is arranged between the tower arm (2) and one end of the second bracket (4) far away from the tower arm (2);

a first backward tilting prevention assembly (6), one end of which is rotatably connected with the first bracket (3) and the other end of which is slidably connected with the main arm (1); the first anti-recline assembly (6) is configured to be freely adjustable in length;

a second backward tilting prevention assembly (7), one end of which is rotatably connected with the second bracket (4) and the other end of which is slidably connected with the main arm (1); and

the amplitude-variable rope (8) is wound between one end of the first bracket (3) far away from the main arm (1) and one end of the second bracket (4) far away from the tower arm (2).

2. The lift arm according to claim 1, characterized in that the first anti-recline assembly (6) and the second anti-recline assembly (7) are identical in structure, each comprising:

a sleeve (61) having one end rotatably connected to the first bracket (3); and

a core tube (62), wherein one end of the core tube (62) is slidably nested at the other end of the sleeve (61); the other end of the core tube (62) is slidably connected with the main arm (1).

3. The boom according to claim 2, characterized in that one of the sleeve (61) and the core tube (62) is provided with an oblong hole (63), wherein the other is provided with a protrusion (64), the protrusion (64) and the oblong hole (63) cooperating to define a relative sliding distance range of the sleeve (61) and the core tube (62).

4. The boom according to claim 2, characterized in that the outer wall of the main arm (1) is provided with a first chute (11), the other end of the core tube (62) of the first anti-recline assembly (6) being mounted in the first chute (11).

5. The boom according to claim 4, characterized in that the first runner (11) comprises a first limit recess to limit the slip limit position of the other end of the core tube (62) of the first anti-recline assembly (6).

6. The boom according to claim 2, characterized in that the outer wall of the main arm (1) is provided with a second chute (12), the other end of the core tube (62) of the second anti-recline assembly (7) being mounted in the second chute (12).

7. The boom according to claim 6, characterized in that the second runner (12) comprises a second limit recess to limit the slip limit position of the other end of the core tube of the second anti-recline assembly (7).

8. A crane, comprising: a boom according to any of claims 1 to 8.

9. A boom lifting method, characterized in that the boom is a boom according to any of claims 1-7, comprising the steps of:

-lifting the first support (3) so that said first support (3) is moved to a set position; wherein, during rotation of the first bracket (3) relative to the main arm (1), the first anti-recline assembly (6) slides along the main arm (1) and rotates with the first bracket (3) relative to the main arm (1);

-lifting the second support (4) so that the second support (4) is moved to a set position and the second pulling plate (9) is tensioned; wherein, during rotation of the second bracket (4) relative to the tower arm (2), the second anti-recline assembly (7) slides along the main arm (1);

contracting the luffing rope (8) until the first bracket (3), the second bracket (4) and the second pulling plate (9) are all tensioned; wherein the length of the first anti-backward tilting component (6) is automatically adjusted along with the shrinkage of the luffing rope (8);

tensioning of the luffing rope (8) is continued until the first pulling plate (5) is tensioned.