Superlift device and work machine

Abstract

The present application provides a superlift device and a work machine. The superlift device comprises at least one mast (200), a first rope-guiding pulley (210), a second rope-guiding pulley (300), a superlift winch (220) and a traction rope (400), wherein a first end of the mast (200) is connected to a boom (100), the first rope-guiding pulley (210) is arranged at a second end of the mast (200); the second rope-guiding pulley (300) is arranged on the boom (100); the superlift winch (220) is arranged on the mast (200); a first end of the traction rope (400) is connected to the superlift winch (220), and a second end of the traction rope (400) is sequentially wound around the second rope-guiding pulley (300) and the first rope-guiding pulley (210) and then connected to the boom (100).

Description

CROSS REFERENCE TO RELATED APPLICATIONS

[0001] The present application claims priority to the Chinese patent application No. 202310328907.X filed on March 30, 2023, the entire content of which is incorporated herein by reference.TECHNICAL FIELD

[0002] The present application relates to the technical field of lifting equipment, and in particular, relates to a superlift device and a work machine.BACKGROUND

[0003] With the development of lifting work machine (such as a crane), its boom is designed to be longer and longer. However, the height and width of the cross-section of the boom is limited by various factors, resulting in an increase in the slenderness ratio of the boom. This leads to an increase in lateral bending deflection and a decrease in the stiffness of the boom, restricting the lifting capacity of the crane. Work machines with longer booms typically use superlift devices to solve the above problem.SUMMARY OF THE INVENTION Technical Problem

[0004] The present application provides a superlift device and a work machine.Technical Solution

[0005] The present application provides a superlift device, comprising: at least one mast, with a first end of the mast connected to a boom; a first rope-guiding pulley arranged at a second end of the mast; a second rope-guiding pulley arranged on the boom; a superlift winch arranged on the mast; a traction rope, with a first end of the traction rope connected to the superlift winch, and a second end of the traction rope being sequentially wound around the second rope-guiding pulley and the first rope-guiding pulley and then connected to the boom; wherein a connection position of the mast being connected to the boom is located between a connection position of the second rope-guiding pulley being connected to the boom and a connection position of the second end of the traction rope being connected to the boom.

[0006] The superlift device according to the present invention further comprises: a rotation-driving member connected to the mast for driving the mast to rotate around the first end of the mast.

[0007] In the superlift device according to the present invention, the rotation-driving member is a telescopic-driving structure; one end of the rotation-driving member is hinged to the mast; the other end of the rotation-driving member is hinged to the boom.

[0008] In the superlift device according to the present invention, there are two masts that are respectively arranged on both sides of the boom; there are respectively two sets of the first rope-guiding pulley, the second rope-guiding pulley, the superlift winch, the traction rope and the rotation-driving member that are arranged in correspondence with the two masts.

[0009] In the superlift device according to the present invention, the two masts are symmetrically arranged with respect to a luffing plane of the boom.

[0010] In the superlift device according to the present invention, rotation axes of the two masts are perpendicular to a center line of the boom and are respectively arranged at an angle to the luffing plane of the boom.

[0011] In the superlift device according to the present invention, the second rope-guiding pulley is arranged at a boom tail of the boom; the second end of the traction rope is connected to a boom head of the boom; or the second rope-guiding pulley is arranged at a boom head of the boom; the second end of the traction rope is connected to a boom tail of the boom.

[0012] The superlift device according to the present invention further comprises a support base, the support base is detachably connected to the boom; the first end of the mast is connected to the support base.

[0013] The present invention also provides a work machine that comprises the superlift device mentioned above.

[0014] The work machine according to the present invention further comprises a turntable and a main luffing cylinder; a boom end of the boom is rotatably connected to the turntable; the main luffing cylinder is respectively hinged to the turntable and the boom for driving the boom to rotate vertically.BRIEF DESCRIPTION OF THE DRAWINGS

[0015] To more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the drawings that are needed for describing the embodiments or the prior art are briefly introduced below. Apparently, the drawings described below only represent some embodiments of the present application, and those skilled in the art can obtain other drawings from these drawings without creative efforts. FIG. 1 is a schematic diagram of a superlift device provided by the present application in a use state; FIG. 2 is a schematic diagram of another view of the superlift device provided by the present application in the use state; FIG. 3 is a schematic diagram of a superlift device provided by the present application showing a mast installation structure.

[0016] Reference numerals: 100, boom; 110, boom head; 120, boom tail; 200, mast; 210, first rope-guiding pulley; 220, superlift winch; 300, second rope-guiding pulley; 400, traction rope; 500, rotation-driving member; 600, support base; 700, turntable; 800, main luffing cylinder.DETAILED DESCRIPTION

[0017] The embodiments of the present application are further described in detail below with reference to the drawings and examples. The following examples are used to illustrate the present application but should not be used to limit the scope of the present application.

[0018] In the description of the embodiments of the present application, terms such as "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, or must be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the embodiments of the present application. Additionally, terms "first", "second", and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the terms "connect with" and "connect to" should be understood in a broad sense. For example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may be directly connected or indirectly connected through an intermediate medium. Those of ordinary skill in the art can understand the specific meanings of the above terms in the embodiments of the present application according to specific circumstances.

[0020] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may mean that the first feature is in direct contact with the second feature, or the first feature is in indirect contact with the second feature through an intermediate medium. Moreover, a first feature being "above", "upper" or "on top of" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply that the first feature has a higher horizontal height than the second feature. A first feature being "below", "lower" or "underneath" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply that the first feature has a lower horizontal height than the second feature.

[0021] In the description of the present specification, reference terms "an embodiment", "some embodiments", "an example", "a specific example" or "some examples" mean that the particular features, structures, materials, or characteristics described in combination with the embodiment or example is included in at least one embodiment or example of the present application. In the present specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples. Furthermore, those skilled in the art can combine and integrate different embodiments or examples described in the present specification, as well as features of different embodiments or examples, as long as they do not conflict with each other.

[0022] The superlift device of an embodiment of the present application will be described below with reference to FIGS. 1 to 3. The superlift device can be installed on a boom 100 to improve the bending resistance of the boom 100 and increase the lifting capacity of the boom 100.

[0023] The superlift device according to an embodiment of the present application comprises a mast 200, a first rope-guiding pulley 210, a second rope-guiding pulley 300, a superlift winch 220, and a traction rope 400.

[0024] At least one mast 200 is provided, with a first end of the mast 200 connected to the boom 100. The mast 200 may be a rod or jib structure with a constant length, or a telescopic jib structure capable of adjusting its length, without specific limitation herein. In the present embodiment, to simplify the structure of the superlift device, the mast 200 is a rod or jib structure with a constant length. Additionally, the mast 200 may have a constant cross-sectional dimension along its length, or its cross-sectional dimension may change continuously or stepwise along its length.

[0025] The first rope-guiding pulley 210 is arranged at a second end of the mast 200, and the axial direction of the second rope-guiding pulley 300 is perpendicular to the length direction of the boom 100.

[0026] The second rope-guiding pulley 300 is arranged on the boom 100, and the axial direction of the second rope-guiding pulley 300 is perpendicular to the length direction of the boom 100.

[0027] The superlift winch 220 is arranged on the mast 200. In this embodiment, the superlift winch 220 may be a hydraulic winch or an electric winch. The superlift winch 220 is connected to a hydraulic system or a power supply system of the work equipment and is powered by the hydraulic system or the power supply system of the work equipment.

[0028] A first end of the traction rope 400 is connected to the superlift winch 220, and a second end of the traction rope 400 is sequentially wound around the second rope-guiding pulley 300 and the first rope-guiding pulley 210 and then connected to the boom 100. The traction rope 400 in the embodiments of the present application may be a steel wire rope, although other ropes meeting the usage requirements may be used as alternatives, without specific limitation herein.

[0029] In one embodiment, at least one of the first rope-guiding pulley 210 and the second rope-guiding pulley 300 adopts an anti-disengagement pulley structure. Both the first rope-guiding pulley 210 and the second rope-guiding pulley 300 adopt anti-disengagement pulley structures, thereby preventing disengagement of the traction rope 400 therefrom.

[0030] In this embodiment, a connection position of the mast 200 being connected to the boom 100 is located between a connection position of the second rope-guiding pulley 300 being connected to the boom 100 and a connection position of the second end of the traction rope 400 being connected to the boom 100. That is, along the length direction of the boom 100, the connection position of the second rope-guiding pulley 300 being connected to the boom 100 and the connection position of the second end of the traction rope 400 being connected to the boom 100 are located on opposite sides of the connection position of the mast 200 being connected to the boom 100.

[0031] In the above solution, when the mast 200 is perpendicular to the length direction of the boom 100, both a pulling force exerted on the boom 100 by the traction rope 400 through the second rope-guiding pulley 300 and a pulling force exerted at the connection position of the second end of the traction rope 400 being connected to the boom 100 are upward, while the pressure exerted on the boom 100 by the traction rope 400 through the first rope-guiding pulley 210 and the mast 200 is downward. This can improve the bending resistance of the boom 100, enabling it to lift heavier objects.

[0032] The superlift device of the embodiments of the present application, by improving the arrangement path of the traction rope 400, can provide pulling forces to the boom 100 at positions on both sides of the mast 200 through the traction rope 400 simultaneously, instead of the way of using a pull plate in the prior art. It has a smaller weight and a simpler structure, and as compared with the way of folding by a pull plate, the traction rope 400 is less likely to be stuck.

[0033] In the embodiments of the present application, the connection position of the mast 200 being connected to the boom 100 is not limited. The connection position of the mast 200 being connected to the boom 100 may be on the outer side of a telescopic boom section of the boom 100 adjacent to the boom tail 120, which can prevent the mast 200 from adversely affecting the telescoping of the boom 100 and is conducive to reducing the volume of the superlift device when retracted, thereby facilitating transportation. Additionally, the connection position of the rope-guiding pulley 300 being connected to the boom 100 and the connection position of the traction rope 400 being connected to the boom 100 may be on the outer side of a telescopic boom section of the boom 100 adjacent to the boom tail 120 or at the outer end of other telescopic boom sections of the boom 100. In one embodiment, one of the connection position of the rope-guiding pulley 300 being connected to the boom 100 and the connection position of the traction rope 400 being connected to the boom 100 is located on the outer side of a telescopic boom section of the boom 100 adjacent to the boom tail 120, and the other one of the connection position of the rope-guiding pulley 300 being connected to the boom 100 and the connection position of the traction rope 400 being connected to the boom 100 is located at the outer end of other telescopic boom sections of the boom 100.

[0034] In one embodiment of the present application, the second rope-guiding pulley 300 is arranged at a boom tail 120 of the boom 100, and the second end of the traction rope 400 is connected to a boom head 110 of the boom 100. After the second end of the traction rope 400 is led out from the superlift winch 220, it first extends toward the boom tail 120 of the boom 100, wounds around a lower side of the second rope-guiding pulley 300, bends upward and folds back toward the mast 200, and then, after wounding over an upper side of the first rope-guiding pulley 210, it is connected to the boom head 110 of the boom 100.

[0035] In another embodiment of the present application, the second rope-guiding pulley 300 is arranged at the boom head 110 of the boom 100, and the second end of the traction rope 400 is connected to the boom tail 120 of the boom 100. After the second end of the traction rope 400 is led out from the superlift winch 220, it first extends toward the boom head 110 of the boom 100, wounds around the lower side of the second rope-guiding pulley 300, bends upward and folds back toward the mast 200, and then, after wounding over an upper side of the first rope-guiding pulley 210, it is connected to the boom tail 120 of the boom 100.

[0036] In the above embodiments, although the arrangement positions of the second rope-guiding pulley 300 and the arrangement directions of the traction rope 400 are different, both can enhance the bending resistance of the boom 100. It can be understood that, in the embodiments of the present application, arranging the second rope-guiding pulley 300 at one of the boom head 110 and the boom tail 120 of the boom 100 and connecting the traction rope 400 to the other of the boom head 110 and the boom tail 120 of the boom 100 can maximize the distance between the position where the traction rope 400 directly or indirectly (through the second rope-guiding pulley 300) acts on the boom 100 and the position where the mast 200 acts on the boom 100, thereby enabling the traction force provided by the traction rope 400 to the boom 100 to have a larger moment and better bending resistance effect. In some other forms, the second rope-guiding pulley 300 and the traction rope 400 may also be connected to other positions on the boom 100, which will not be elaborated herein.

[0037] The superlift device according to an embodiment of the present application further comprises a rotation-driving member 500 connected to the mast 200 for driving the mast 200 to rotate around the first end of the mast 200, thereby achieving the luffing-up and retracting functions.

[0038] Specifically, the process in which the rotation-driving member 500 drives the mast 200 to rotate until it is perpendicular or approximately perpendicular to the length direction of the boom 100 is the luffing-up process. When the mast 200 is perpendicular or approximately perpendicular to the length direction of the boom 100, it is in a working state. During the luffing-up process, adjusting the length of the traction rope 400 by the superlift winch 220 to adapt to the position of the mast 200 can prevent the boom 100 from bending and deforming in the working state. The process in which the rotation-driving member 500 drives the mast 200 to rotate towards the boom 100 until the mast 200 is parallel or nearly parallel to the boom 100 is a retracting process. During this process, adjusting the traction rope 400 to a suitable length by the superlift winch 220 can prevent the traction rope 400 from becoming loose. When the mast 200 is parallel or nearly parallel to the boom 100, it is in the retracted state, thereby facilitating transportation.

[0039] In some embodiments of the present application, the rotation-driving member 500 is a telescopic-driving structure, such as an oil cylinder, a pneumatic cylinder, or a telescopic motor. In this embodiment, it is an oil cylinder. One end of the rotation-driving member 500 is hinged to the mast 200, and the other end of the rotation-driving member 500 is hinged to the boom 100. When the rotation-driving member 500 extends, it can drive the mast 200 to luff up, and when the rotation-driving member 500 retracts, it can drive the mast 200 to retract.

[0040] In some embodiments of the present application, the rotation-driving member 500 is a rotatable driving structure, such as an electric motor or a hydraulic motor. In this embodiment, the rotation-driving member 500 may be connected to a rotation shaft of the mast 200 through a motion-transmission structure such as a gear set, a belt or a chain. When the rotation-driving member 500 operates, it can drive the mast 200 to rotate, so as to realize luffing-up or retracting.

[0041] In one embodiment, there are two masts 200 that are respectively arranged on both sides of the boom 100, and there are respectively two sets of the first rope-guiding pulley 210, the second rope-guiding pulley 300, the superlift winch 220, the traction rope 400 and the rotation-driving member 500 that are arranged in correspondence with the two masts 200. The two masts 200 and the two traction ropes 400 corresponding to the two masts 200 can simultaneously resist the bending of the boom 100, with a better bending resistance effect.

[0042] In one embodiment, the two masts 200 are symmetrically arranged with respect to a luffing plane of the boom 100. It can be understood that, in order to adapt to the symmetrical structure of the two masts 200, there are two sets of the first rope-guiding pulley 210, the second rope-guiding pulley 300, the superlift winch 220, the traction rope 400 and the rotation-driving member 500 that are symmetrically arranged with respect to the luffing plane of the boom 100, and are connected to the corresponding masts 200, thereby enabling uniform force bearing on both sides of the boom 100.

[0043] In one embodiment, rotation axes of the two masts 200 are perpendicular to a center line of the boom 100 and are respectively arranged at an angle to the luffing plane of the boom 100. When the two masts 200 are rotated and erected, the rotation plane of each of the masts 200 intersects with the luffing plane of the boom 100, that is, the rotation plane of each of the masts 200 is at an angle to the center line of the boom 100, and the displacement of the masts 200 includes a displacement component along the center line direction of the boom 100 and a displacement component perpendicular to the center line direction of the boom 100. When the masts 200 are driven to rotate by the rotation-driving member 500, the luffing and unfolding processes of the masts 200 can be realized simultaneously. Compared with the way of driving by a luffing cylinder and by an unfolding cylinder respectively in the prior art, the present embodiment has the advantages of simple structure, convenient operation, low failure rate, low use cost and the like, and can further reduce the total weight of the superlift device, thereby better adapting to small and medium tonnage cranes.

[0044] In the above solution, the two traction ropes 400 corresponding to the two masts 200 provide oblique pulling forces to the boom 100. The component of the pulling force in the deflection deformation plane of the boom 100 can reduce the deflection deformation of the boom 100; the component of the pulling force in the lateral bending deformation plane of the boom 100 can reduce the lateral bending deformation of the boom 100; thereby improving the stiffness of the boom 100 and enhancing the lifting capacity thereof.

[0045] In some embodiments of the present application, the superlift device further comprises a support base 600, the support base 600 is detachably connected to the boom 100; the first end of the mast 200 is connected to the support base 600. In the present embodiment, the detachable connection manner between the support base 600 and the boom 100 may be a bolt connection, a pin connection, or a snap-fit connection, without specific limitation herein. In the embodiments of the present application, since the support base 600 is detachably connected to the boom 100, the mast 200 and the superlift winch 220 on the mast 200 can be conveniently detached from the boom 100 when needed, thereby facilitating operations such as maintenance and separate transportation.

[0046] The embodiments of the present invention also provide a work machine, comprising the superlift device mentioned above. The work machine according to the embodiments of the present application may be a crane.

[0047] In one embodiment, the work machine of the present application further comprises a turntable 700 and a main luffing cylinder 800, the boom end 120 of the boom 100 is rotatably connected to the turntable 700, and the main luffing cylinder 800 is respectively hinged to the turntable 700 and the boom 100 for driving the boom 100 to rotate vertically. The turntable 700 can drive the boom 100 to perform horizontal slewing movements, and the main luffing cylinder 800 can drive the boom 100 to perform vertical luffing actions.

[0048] In the embodiment of the present application, since the superlift device is arranged on the boom 100, there is no interference with the slewing and luffing of the boom 100, and since the mast 200 is connected to both the boom head 110 and the boom tail 120 of the boom 100 through the traction rope 400, and the traction rope 400 has the ability to adjust its length, therefore, the traction rope 400 does not interfere with the telescoping of the boom 100. It is obvious that the superlift device and the work machine of the embodiments of the present application have better use flexibility than the prior art.

[0049] In order to facilitate understanding, the operation processes of the superlift winch 220 in different situations are briefly introduced below. It is assumed that the forward rotation of the superlift winch 220 is the process of reeling out the traction rope 400, and the reverse rotation of the superlift winch 220 is the process of reeling in the traction rope 400: When the rotation-driving member 500 drives the mast 200 to erect, the superlift winch 220 rotates forward to reel out the traction rope 400 while the mast 200 is erecting, until the mast 200 is perpendicular to the boom 100; When the rotation-driving member 500 drives the mast 200 to retract, the superlift winch 220 rotates reversely to reel in the traction rope 400 while the mast 200 is retracting, until the mast 200 is parallel or nearly parallel to the boom 100; When the boom 100 extends to become longer, the superlift winch 220 rotates forward to reel out the traction rope 400 while the boom 100 is becoming longer, until the boom 100 reaches a suitable length; When the boom 100 retracts to become shorter, the superlift winch 220 rotates reversely to reel in the traction rope 400 while the boom 100 is becoming shorter, until the boom 100 reaches a suitable length.

[0050] In the above-mentioned processes, the traction rope 400 is always maintained at a suitable tension force by reeling out and reeling in the traction rope 400 by using the superlift winch 220, which not only prevents the traction rope 400 from loosening but also prevents the traction rope 400 from adversely affecting the erection of the mast 200 and the extension of the boom 100. When lifting heavy objects, the superlift winch 220 can lock the length of the traction rope 400 with, for example, a ratchet and pawl engagement structure, thereby providing good bending resistance. The structure by which the superlift winch 220 locks the traction rope 400 is not regarded as an essential part of the embodiments of the present application, which will not be elaborated herein.

[0051] Finally, it should be noted that the above embodiments are merely used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions described in the foregoing embodiments can still be modified, or some technical features thereof can be equivalently substituted. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the respective embodiments of the present application.

Claims

1. A superlift device, comprising: at least one mast (200), with a first end of the mast (200) connected to a boom (100); a first rope-guiding pulley (210) arranged at a second end of the mast (200); a second rope-guiding pulley (300) arranged on the boom (100); a superlift winch (220) arranged on the mast (200); a traction rope (400), with a first end of the traction rope (400) connected to the superlift winch (220), and a second end of the traction rope (400) being sequentially wound around the second rope-guiding pulley (300) and the first rope-guiding pulley (210) and then connected to the boom (100); wherein a connection position of the mast (200) being connected to the boom (100) is located between a connection position of the second rope-guiding pulley (300) being connected to the boom (100) and a connection position of the second end of the traction rope (400) being connected to the boom (100).

2. The superlift device according to claim 1, further comprising: a rotation-driving member (500) connected to the mast (200) for driving the mast (200) to rotate around the first end of the mast (200).

3. The superlift device according to claim 2, wherein the rotation-driving member (500) is a telescopic-driving structure, one end of the rotation-driving member (500) is hinged to the mast (200), and the other end of the rotation-driving member (500) is hinged to the boom (100).

4. The superlift device according to claim 2 or 3, wherein there are two masts (200) that are respectively arranged on both sides of the boom (100), and there are respectively two sets of the first rope-guiding pulley (210), the second rope-guiding pulley (300), the superlift winch (220), the traction rope (400) and the rotation-driving member (500) that are arranged in correspondence with the two masts (200).

5. The superlift device according to claim 4, wherein the two masts (200) are symmetrically arranged with respect to a luffing plane of the boom (100).

6. The superlift device according to claim 4 or 5, wherein rotation axes of the two masts (200) are perpendicular to a center line of the boom (100) and are respectively arranged at an angle to the luffing plane of the boom (100).

7. The superlift device according to any one of claims 1 to 6, wherein the second rope-guiding pulley (300) is arranged at a boom tail (120) of the boom (100), and the second end of the traction rope (400) is connected to a boom head (110) of the boom (100).

8. The superlift device according to any one of claims 1 to 6, wherein the second rope-guiding pulley (300) is arranged at a boom head (110) of the boom (100), and the second end of the traction rope (400) is connected to a boom tail (120) of the boom (100).

9. The superlift device according to any one of claims 1 to 8, further comprising a support base (600), the support base (600) is detachably connected to the boom (100), and the first end of the mast (200) is connected to the support base (600).

10. A work machine, comprising the superlift device according to any one of claims 1 to 9.

11. The work machine according to claim 10, further comprising a turntable (700) and a main luffing cylinder (800), a boom end (120) of the boom (100) is rotatably connected to the turntable (700), and the main luffing cylinder (800) is respectively hinged to the turntable (700) and the boom (100) for driving the boom (100) to rotate vertically.

Images