US-20260125248-A1 - FOLDABLE SUPERLIFT DEVICE, CRANE, AND TENSIONING CONTROL SYSTEM AND METHOD

US20260125248A1US 20260125248 A1US20260125248 A1US 20260125248A1US-20260125248-A1

Abstract

A superlift device includes a superlift boom, and a superlift base and a superlift winch disposed at two ends of the superlift boom, where the superlift boom includes a fixed boom connected to the superlift base and a folding boom connected to the superlift winch, and the folding boom is connected to the fixed boom via a pivot shaft, achieving length adjustment of the superlift boom by means of unfolding and folding. A crane, a multi-angle tensioning control system, and a multi-angle tensioning control method include the foldable superlift device.

Inventors

Honggang Ding
Bo Li
Sisheng Gu
Yuqin Fu
Xiaohu Qin
Dazhong Cheng

Assignees

XUZHOU HEAVY MACHINERY CO., LTD.

Dates

Publication Date: 20260507
Application Date: 20260104
Priority Date: 20230705

Claims (8)

1 . A foldable superlift device, comprising a superlift boom, and a superlift base and a superlift winch disposed at two ends of the superlift boom, wherein the superlift boom comprises a fixed boom connected to the superlift base and a folding boom connected to the superlift winch, and the folding boom is connected to the fixed boom via a pivot shaft, achieving length adjustment of the superlift boom by unfolding and folding.
2 . The foldable superlift device according to claim 1 , wherein a first connection point is provided on one side of joining ends of the fixed boom and the folding boom, and connection is made via a fixed pivot shaft.
3 . The foldable superlift device according to claim 2 , wherein a second connection point and a third connection point are also respectively provided on the other side of the joining ends of the fixed boom and the folding boom and on boom sides of the fixed boom and the folding boom, and connections are made via pin assemblies; when the fixed boom and the folding boom are not folded, a position of the second connection point is fixed via the pin assembly; when the fixed boom and the folding boom are fully folded, a position of the third connection point is fixed via the pin assembly.
4 . The foldable superlift device according to claim 3 , wherein the pin assembly is an automatic insertion-and-extraction device.
5 . The foldable superlift device according to claim 4 , wherein the fixed boom and the folding boom are connected via a crank-rocker assembly, and driving is realized by a drive element to control the crank-rocker assembly to swing, thereby driving the folding boom to perform folding/unfolding actions.
6 . A crane, comprising the foldable superlift device according to claim 5 , wherein the foldable superlift device is provided on a telescopic main boom of the crane.
7 . A multi-angle tensioning control system, implemented based on the crane according to claim 6 , the multi-angle tensioning control system comprising: a force limiter system, a display system, a boom position detection device, a superlift first angle sensor, a superlift second angle sensor, a superlift winch encoder, and a superlift tension sensor.
8 . A multi-angle tensioning control method, employing the multi-angle tensioning control system according to claim 7 , the multi-angle tensioning control method comprising following steps: S1, completing installation of the foldable superlift device, and checking whether the crane possesses boom raising conditions; S2, unlocking a cylinder and a winch of the superlift device, so that the main boom possesses boom extending conditions; S3, extending the main boom to a specified boom length combination, and luffing to a corresponding main boom angle; S4, performing, according to the boom length combination of the main boom, first-stage unfolding of the superlift device to make a first-stage unfolding angle α reach a specified angle, wherein the first-stage unfolding angle is an included angle between the fixed boom and the main boom; S5, performing, according to the boom length combination of the main boom, second-stage unfolding of the superlift device to make a second-stage unfolding angle β reach a specified angle, wherein the second-stage unfolding angle is an included angle between the fixed boom and the folding boom; S6, re-confirming whether the two-stage unfolding angles of the superlift device match the corresponding boom length combination of the main boom, and if not matching, performing readjustment; S7, performing superlift tensioning after confirming that the two-stage unfolding angles of the superlift device are correct, and locking the winch when the winch reaches a specified rotation angle; S8, detecting, by the superlift tension sensor, whether a superlift tensioning force meets a design requirement; if not met, unlocking the superlift winch, adjusting a number of winch teeth, and re-tensioning and locking; and S9, performing load lifting after the tensioning force meets a design value.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application is a continuation of International Application of PCT application serial no. PCT/CN 2023/138615, filed on Dec. 14, 2023 which claims the priority benefit of Chinese application no. 202310815925.0, filed on Jul. 5, 2023. The entirety of each of the above-mentioned patent applications is hereby incorporated by reference herein and made a part of this specification. TECHNICAL FIELD The present application relates to the technical field of construction machinery, and in particular, to a foldable superlift device, a crane, and a tensioning control system and method. BACKGROUND With the continuous improvement of crane technology and higher requirements from customers for product performance, the overall vehicle weight has not increased due to slight restrictions on single axle loads, while the boom structure design tends to adopt a lightweight design. This leads to an increased boom length and higher performance requirements, while the boom cross-section and plate thickness are becoming smaller and smaller. If limited to the previously designed superlift device with a fixed length, the improvement in lifting performance is limited, making it difficult for the product to meet customer needs; product competitiveness will also decline, directly affecting the enterprise's product sales. However, superlift devices currently used in the market still adopt a fixed-length structural form. This structural form cannot enable the crane boom to fully utilize the performance of the product boom structure, cannot better improve boom strength and stiffness, and fails to meet customer demands for high performance. In addition, since the superlift device is installed on the basic boom of the crane boom, the superlift device is limited by the length of the basic boom; the length of the superlift device cannot be greater than the length of the basic boom, so fixed-length superlift devices are constrained by installation dimensions. In the prior art, there are mainly two forms of superlift devices. The first is the assembly type, which achieves a change in the length of the superlift device during use by adding an extension section structure or a similar structure between the superlift boom and the superlift winch. The second is the telescopic type; the telescopic structure is similar to the telescoping system of a crane boom, where the telescoping system uses a cylinder or ropes for extension and retraction, retracting fully or partially during transit, and extending outward to the working boom length during use. For a superlift device of the assembly type, the length change of the superlift device is realized by adding an assembly component to the superlift device during use. However, after lengthening, it no longer meets the overall machine space requirements for transit, and the installed component needs to be removed again so that the superlift device can be fully stowed on the crane boom. Moreover, the added component needs to be transported separately. This form not only increases transportation costs but also increases assembly and disassembly time before and after use, resulting in low operational efficiency and poor convenience of use. For a superlift device of the telescopic type, the length is adjustable during use, but the superlift device adopts a telescopic cylinder with one end connected to the upper part of the superlift device and the other end connected to the lower part of the superlift device. Since the length of superlift devices is mostly over 10 m, the telescopic cylinder used is long, heavy, and has high cost and low cost performance. These characteristics restrict the development and promotion of the superlift device. Meanwhile, in the prior art, the superlift has only one unfolding angle. During tensioning, the superlift can only adjust its influence on the boom by a single angle. The unfolding angle is singular, and under the condition of a fixed superlift length, the unfolding angle cannot be adjusted in multiple stages. During use, the unfolding angle cannot be adjusted according to the boom length of the crane boom, and the two cannot achieve optimal matching. Superlift tensioning performed under this single-angle form provides limited improvement to the boom performance and cannot fully enhance the performance of the product. SUMMARY OF INVENTION Objectives of the present application: In order to overcome the deficiencies mentioned in the background section, a first objective of the present application is to disclose a foldable superlift device, which can achieve three different working forms by means of multi-stage adjustment forms of folding/unfolding. A second objective is to disclose a crane including the above-mentioned foldable superlift device. By means of the folding/unfolding of the superlift device, and in combination with a main boom length and combination, multi-stage unfolding of the superlift device can be adopted to switch between