Novel lifting arm

Abstract

The utility model relates to the field of hoisting equipment, in particular to a novel lifting arm which comprises a plurality of inserted arm barrels, pulleys are rotatably arranged on the outer sides of the arm barrels, the pulleys are rotatably connected with the corresponding arm barrels through fixing devices, the pulley of the inner side arm barrel is arranged on the upper face of the arm barrel, and the pulley of the outer side arm barrel is arranged on the outer side of the arm barrel. The fixing device comprises an inner support, a bearing is mounted on the outer side of the inner support, the pulley is mounted on the outer side of the bearing, a baffle is arranged at the upper end of the inner support and provided with a plurality of connecting bolts, and the connecting bolts penetrate through the inner support to be fixedly connected with the corresponding arm barrels. The utility model has the advantages of reasonable structure, compact layout, strong stability and reduced material waste.

Description

TECHNICAL FIELD

[0001] The utility model relates to hoisting equipment field especially relates to a novel lifting arm. BACKGROUND

[0002] The lifting arm is the core component of the crane, and the design of the lifting arm directly influences the working performance of the crane. The pulley fixing mechanism is one of the core components for realizing the telescoping of the telescopic lifting arm, and the different installation modes of the pulley directly influence the hoisting performance of the lifting arm and even the whole vehicle. At present, the fixed support pulley installation mode is generally adopted for the small and medium-sized telescopic arm type crane. Due to the unreasonable design of the structure, the spacing between the arm barrels in the same direction is too large, the structure is not compact, the stability is poor, and the material needs to be strengthened to ensure the stability. Therefore, it is particularly necessary to develop a novel lifting arm which is reasonable in structure, compact in layout, strong in stability and reduces material waste. SUMMARY

[0003] The utility model discloses a novel lifting arm which is reasonable in structure, compact in layout, strong in stability and reduces material waste.

[0004] The technical scheme adopted is as follows:

[0005] A novel lifting arm, comprising a plurality of inserted arm barrels, wherein pulleys are rotatably arranged on the outer sides of the arm barrels, the pulleys are rotatably connected to the corresponding arm barrels by a fixing device, the pulleys of the inner arm barrels are arranged on the upper surface of the arm barrels, and the pulleys of the outer arm barrels are arranged on the outer side of the arm barrels. The fixing device comprises an inner support, a bearing is mounted on the outer side of the inner support, the pulleys are mounted on the outer side of the bearing, a baffle is arranged on the upper end of the inner support, the baffle is provided with a plurality of connecting bolts, and the connecting bolts are fixedly connected to the corresponding arm barrels by penetrating the inner support.

[0006] Preferably, the baffle is an annular baffle ring.

[0007] Preferably, there are eight connecting bolts, and the adjacent connecting bolts are equally spaced.

[0008] Compared with the prior art, the novel lifting arm has the beneficial effects that:

[0009] 1. The pulleys mounted on the side surface of the inner arm barrels are mounted on the upper end in the utility model, the spacing of the barrel wall is shortened, the layout is reasonable, the structure is compact, the material is reduced, and the stability of the lifting arm can be ensured.

[0010] 2. The pulley fixing device of the utility model is convenient for dismounting the baffle to lubricate the internal bearing, reduces the probability of failure, and prolongs the service life. BRIEF DESCRIPTION OF DRAWINGS

[0011] Fig. 1 is a sectional structure schematic view of the novel lifting arm of the utility model,

[0012] Fig. 2 is a three-dimensional structure schematic view of the fixing device of the novel lifting arm,

[0013] In the figure: 1, arm cylinder; 2, pulley; 3, inner support; 4, bearing; 5, baffle; 6, connecting bolt. DETAILED DESCRIPTION

[0014] The utility model will be further described below in combination with specific embodiments, such as Figs. 1-2 As shown in the figure:

[0015] Embodiment 1: a novel lifting arm, comprising a plurality of inserted arm cylinders 1, the outer side of the arm cylinder 1 is rotationally provided with a pulley 2, the pulley 2 is rotationally connected with the corresponding arm cylinder 1 by a fixing device, a steel cable for controlling the extension and contraction is arranged between the arm cylinders 1, the corresponding arm cylinder 1 is pulled by the steel cable to control the extension and contraction of the lifting arm, the pulley 2 of the inner side arm cylinder 1 is arranged on the upper surface of the arm cylinder 1, the inner side arm cylinder 1 arranged on the upper surface is shortened to reduce the lateral spacing with the adjacent arm cylinder 1, thereby reducing the width of the overall lifting arm, the structure is compact, the layout is reasonable, and the waste of materials is reduced.

[0016] The fixing device comprises an inner support 3, the outer side of the inner support 3 is provided with a bearing 4, the pulley 2 is installed on the outer side of the bearing 4, the upper end of the inner support 3 is provided with a baffle 5, the baffle 5 is provided with a plurality of connecting bolts 6, the connecting bolts 6 are all fixedly connected with the corresponding arm cylinder 1 by penetrating the inner support 3, the inner support 3 is installed on the arm cylinder 1 by using the connecting bolts 6 and the baffle 5, when the bearing 4 needs to be lubricated, the baffle 5 can be disassembled to lubricate the bearing 4, thereby reducing the probability of failure and prolonging the service life.

[0017] Embodiment 2: a novel lifting arm, comprising a plurality of inserted arm cylinders 1, the outer side of the arm cylinder 1 is rotationally provided with a pulley 2, the pulley 2 is rotationally connected with the corresponding arm cylinder 1 by a fixing device, a steel cable for controlling the extension and contraction is arranged between the arm cylinders 1, the corresponding arm cylinder 1 is pulled by the steel cable to control the extension and contraction of the lifting arm, the pulley 2 of the inner side arm cylinder 1 is arranged on the upper surface of the arm cylinder 1, the inner side arm cylinder 1 arranged on the upper surface is shortened to reduce the lateral spacing with the adjacent arm cylinder 1, thereby reducing the width of the overall lifting arm, the structure is compact, the layout is reasonable, and the waste of materials is reduced.

[0018] The fixing device comprises an inner support 3, the outer side of the inner support 3 is provided with a bearing 4, the pulley 2 is installed on the outer side of the bearing 4, the upper end of the inner support 3 is provided with a baffle 5, the baffle 5 is provided with a plurality of connecting bolts 6, the connecting bolts 6 are all fixedly connected with the corresponding arm cylinder 1 by penetrating the inner support 3, the inner support 3 is installed on the arm cylinder 1 by using the connecting bolts 6 and the baffle 5, the baffle 5 is an annular baffle ring, there are eight connecting bolts 6, and the adjacent connecting bolts 6 are equally spaced.

[0019] The specific working process is as follows: when assembling the lifting arm, the pulley 2 of the innermost arm cylinder 1 is installed to the upper end of the arm cylinder 1 by using a fixing device, and the pulley 2 of the other arm cylinder 1 is installed to the side of the arm cylinder 1 by using a fixing device, when the bearing 4 needs to be lubricated, each arm cylinder 1 is extended, and the baffle 5 is disassembled, so that the bearing 4 can be lubricated, the probability of failure is reduced, and the service life is prolonged.

[0020] The above embodiment is only a preferred embodiment of the utility model, and cannot be used to limit the range of the utility model protection, and any non-substantial change and replacement made by the person skilled in the art on the basis of the utility model belongs to the range of the utility model protection.

Claims

1. A novel lift arm characterized by: The utility model relates to an arm cylinder (1) comprising a plurality of plug-in arms, each of which is rotatably provided with a pulley (2) on the outside, and the pulley (2) is rotatably connected to the corresponding arm cylinder (1) by a fixing device, the pulley (2) of the inner arm cylinder (1) is arranged on the upper surface of the arm cylinder (1), and the pulley (2) of the outer arm cylinder (1) is arranged on the outer side of the arm cylinder (1), the fixing device comprises an inner support (3), a bearing (4) is mounted on the outer side of the inner support (3), the pulley (2) is mounted on the outer side of the bearing (4), a baffle (5) is arranged on the upper end of the inner support (3), the baffle (5) is provided with a plurality of connecting bolts (6), and each connecting bolt (6) is fixedly connected to the corresponding arm cylinder (1) by penetrating the inner support (3).

2. A novel lifting arm as claimed in claim 1 characterized in that: The baffle (5) is an annular baffle ring.

3. A novel lifting arm as claimed in claim 1, characterized in that: The connecting bolts (6) are eight in number, and the adjacent connecting bolts (6) are spaced apart by the same distance.

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