Foldable super-lifting device, crane, and tensioning control system and method

Abstract

A foldable super-lifting device, comprising a super-lifting boom (1), and a super-lifting pedestal and a super-lifting winch (2) which are provided at two ends of the super-lifting boom (1). The super-lifting boom (1) comprises a fixed boom (101) connected to the super-lifting pedestal, and a folding boom (102) connected to the super-lifting winch (2). The folding boom (102) is connected to the fixed boom (101) by means of a rotating shaft. The length of the super-lifting boom (1) is adjusted by means of unfolding and folding. Also disclosed are a crane comprising the foldable super-lifting device, and a multi-angle tensioning control system and method. By guiding the foldable super-lifting device for tensioning before hoisting operation, and using different two-stage unfolding schemes on the basis of main boom lengths and combinations, the relationship of a super-lifting length with unfolding angles and the main boom lengths is optimized, so that the stress state of main booms can be improved to the greatest extent, the strength and rigidity of the main booms are increased, and product performance is improved.

Description

A foldable superlift device, crane, and tensioning control system and method Technical Field

[0001] The present invention relates to the technical field of engineering machinery, and in particular to a foldable superlifting device, a crane, and a tensioning control system and method. Background Art

[0002] With the continuous advancement of crane technology and the increasing demand for higher performance from customers, the weight of the entire vehicle has remained constant, limited by the single-axle load, while boom structural design has shifted towards lightweight design. This has led to increased performance requirements for longer boom lengths, while boom cross-sections and plate thicknesses have become increasingly smaller. If superlift devices were limited to the traditional fixed-length designs, the improvement in lifting performance would be limited, making it difficult to meet customer needs, reducing product competitiveness, and directly impacting company sales.

[0003] However, the superlift devices currently used in the market still use a fixed-length structure. This structure cannot fully utilize the performance of the product's boom structure, cannot effectively improve the boom's strength and rigidity, and cannot meet customers' demand for high performance. In addition, because the superlift device is installed on the basic boom, it is limited by the length of the basic boom and cannot exceed the length of the basic boom. The fixed-length superlift device is restricted by the installation size.

[0004] In the prior art, there are two main types of super-lifting devices. The first is an assembled type, which changes the length of the super-lifting device during use by adding an extension section structure or a similar structure between the super-lifting boom and the super-lifting winch; the second is a telescopic type, a telescopic structure, similar to the telescopic system of a crane arm. The telescopic system uses a cylinder or a rope row to retract, and is fully retracted or partially retracted during the transfer process, and is retracted outward to the arm length in use when in use.

[0005] The assembled super-lifting device changes its length by adding assembly parts to the super-lifting device during use. However, after the length is increased, it no longer meets the space requirements for the entire machine during transfer. The installed parts need to be removed before the super-lifting device can be completely lowered onto the crane arm. Moreover, the added parts need to be transported separately. This form not only increases the transportation cost, but also increases the time for disassembly and assembly before and after use, resulting in low operating efficiency and poor convenience.

[0006] The telescopic super-lifting device can adjust its length during use, but it uses a telescopic cylinder, one end of which is connected to the upper part of the super-lifting device and the other end is connected to the lower part of the super-lifting device. Since the length of the super-lifting device is mostly more than 10m, the telescopic cylinder is long and heavy, and its cost is high and the cost-effectiveness is low. This feature restricts the development and promotion of the super-lifting device.

[0007] At the same time, the existing technology has only one deployment angle for super lifting. When tensioning, the super lifting can only adjust the impact on the boom through a single angle. The deployment angle is single. Under the condition of fixed super lifting length, the deployment angle cannot be adjusted in multiple levels. When in use, the deployment angle cannot be adjusted according to the arm length of the crane arm, and the two cannot achieve the optimal match; super lifting tensioning under this single angle form has limited improvement on the boom performance and cannot fully improve the performance of the product.

[0008] Summary of the Invention

[0009] Purpose of the invention: In order to overcome the shortcomings of the background technology, the first purpose of the present invention is to disclose a foldable super-lifting device that can achieve three different working modes through multi-level adjustment of folding / unfolding;

[0010] A second object is to disclose a crane including the above-mentioned foldable superlifting device, which can be folded / unfolded by combining the main boom length and combination to achieve multi-stage deployment of the superlifting device and switch between different deployment working states;

[0011] The third object is to disclose a multi-angle tensioning control system including the above-mentioned foldable super-lifting device;

[0012] The fourth object is to disclose a multi-angle tensioning control method including the above-mentioned foldable super-lifting device.

[0013] Technical solution: The foldable super-lifting device disclosed in the present invention includes a super-lifting boom and a super-lifting support and a super-lifting winch arranged at both ends of the super-lifting boom. The super-lifting boom includes a fixed boom connected to the super-lifting support and a folding boom connected to the super-lifting winch. The folding boom is connected to the fixed boom through a rotating shaft, and the length of the super-lifting boom can be adjusted by unfolding and folding.

[0014] Furthermore, a first connection point is provided on one side of the splicing end of the fixed arm and the folding arm, which are connected via a fixed rotating shaft.

[0015] Furthermore, a second connection point and a third connection point are respectively provided on the other side of the spliced ​​end of the fixed arm and the folding arm, and on the arm side of the fixed arm and the folding arm, which are connected by a latch assembly. When the fixed arm and the folding arm are not folded, the position of the second connection point is fixed by the latch assembly; when the fixed arm and the folding arm are completely folded, the position of the third connection point is fixed by the latch assembly.

[0016] Furthermore, the latch assembly is an automatic plug-in and pull-out device.

[0017] Furthermore, the fixed arm and the folding arm are connected via a crank rocker assembly, and are driven by a driving element to control the crank rocker assembly to swing, thereby driving the folding arm to fold / unfold.

[0018] A crane is provided with the above-mentioned foldable super-lifting device on its telescopic main arm.

[0019] A multi-angle tensioning control system is implemented based on the above-mentioned crane, including: a force limiter system, a display system, an arm position detection device, a super-lifting first angle sensor, a super-lifting second angle sensor, a super-lifting winch encoder and a super-lifting tension sensor.

[0020] A multi-angle tensioning control method, using the multi-angle tensioning control system described above, comprises the following steps:

[0021] S1. Install the foldable superlift device and check whether the crane is ready for lifting the boom.

[0022] S2. Unlock the oil cylinder and winch of the superlift device to make the main boom ready for extension.

[0023] S3: The main boom is extended to the specified boom length combination and the boom is adjusted to the corresponding main boom angle;

[0024] S4. Based on the main boom length combination, the super lifting device performs a first-stage deployment, so that the first-stage deployment angle α reaches a specified angle. The first-stage deployment angle is the angle between the fixed boom and the main boom;

[0025] S5. The superlift device performs secondary deployment according to the main boom length combination, so that the secondary deployment angle β reaches a specified angle. The secondary deployment angle is the angle between the fixed boom and the folding boom.

[0026] S6. Reconfirm whether the two-stage deployment angle of the super lifting device matches the corresponding arm length combination of the main arm. If not, readjust it;

[0027] S7. After confirming that the two-stage deployment angles of the super-lifting device are correct, the super-lifting tensioning is carried out. When the winch reaches the specified rotation angle, the winch is locked;

[0028] S8. Use the super-lifting tension sensor to check whether the super-lifting tensioning force meets the design requirements. If not, unlock the super-lifting winch, adjust the number of winch teeth, re-tension, and lock;

[0029] S9. After the tensioning force meets the design value, carry out lifting.

[0030] Beneficial effects: Compared with the prior art, the advantages of the present invention are: First, in a limited space, the fixed-length super-lifting device is designed as a foldable device, which increases the effective use length, improves the strength and rigidity of the boom, and optimizes the matching with the boom arm length combination, thereby achieving a substantial improvement in the lifting capacity of the product; secondly, through the foldable super-lifting device, the super-lifting two-stage expansion is realized, which can change the lateral expansion range to a greater extent. When in use, different super-lifting first- and second-stage expansion working states can be switched according to different boom arm length combinations, and the effective length and expansion angle of the super-lift can be adjusted to make the super-lifting length correspond to the crane boom length to achieve the optimal match, fully improve the boom strength and rigidity, reduce the stress on the super-lifting itself, and improve the safety and stability of the boom. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 is a structural diagram of a foldable super-lifting device according to the present invention;

[0032] FIG2 is a diagram showing three states of the foldable super-lifting device of the present invention;

[0033] FIG3 is a folding principle diagram of the foldable super-lifting device of the present invention;

[0034] FIG4 is a structural diagram of the crane of the present invention;

[0035] Figure 5 shows four working states of the super-lifting device on the crane of the present invention;

[0036] FIG6 is a flow chart of the multi-angle tensioning control method of the present invention. DETAILED DESCRIPTION

[0037] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0038] As shown in Figure 1, the foldable super-lifting device includes a super-lifting boom 1 and a super-lifting support and a super-lifting winch 2 arranged at both ends of the super-lifting boom 1. The super-lifting boom 1 includes a fixed boom 101 connected to the super-lifting support and a folding boom 102 connected to the super-lifting winch 2. The folding boom 102 is connected to the fixed boom 101 through a rotating shaft, and can be folded to the side through the rotating shaft. The length of the super-lifting boom 1 can be adjusted by unfolding and folding.

[0039] A first connection point 103 is provided on one side of the joint end of the fixed arm 101 and the folding arm 102, connected by a fixed rotating shaft. A second connection point 104 and a third connection point 105 are also provided on the other side of the joint end of the fixed arm 101 and the folding arm 102, as well as on the arm side of the fixed arm 101 and the folding arm 102, respectively, connected by a latch assembly. The latch assembly is an automatic plug-in and unplug device, and the actuator is preferably a hydraulic telescopic cylinder that can be extended and retracted in two or more stages. When the fixed arm 101 and the folding arm 102 are not folded, the position of the second connection point 104 is fixed by the latch assembly; when the fixed arm 101 and the folding arm 102 are fully folded, the position of the third connection point 105 is fixed by the latch assembly.

[0040] The fixed arm 101 and the folding arm 102 are connected through a crank rocker assembly 106 and driven by a driving element 107. The driving element 107 is preferably a hydraulic telescopic cylinder, which controls the swing of the crank rocker assembly 106 and drives the folding arm 102 to fold / unfold.

[0041] The fixed arm 101 can also be set as a multi-section structure, and each section is connected by a rotating shaft. The specific implementation structure of the rotating shaft is consistent with the rotating shaft structure between the above-mentioned fixed arm 101 and the folding arm 102, which can realize the folding action of the folding arm 102 more than twice.

[0042] As shown in Figure 2, the fixed and foldable structure lengths are for illustration purposes only; actual lengths can vary based on design requirements. The design of the superlift winch in this patent is not limited to the superlift foldable boom as described herein; it can also be located on the superlift fixed boom, depending on the specific design requirements. The telescopic motion of the cylinder is converted into rotational motion of the superlift foldable boom via the crank-rocker assembly 106, simplifying the kinematic mechanism model to a crank-rocker mechanism model, as shown in Figure 3.

[0043] As shown in FIG4 , the crane has the above-mentioned foldable super-lifting device on its telescopic main boom. The super-lifting device is installed at the boom head of the main boom. During road transportation and short-distance heavy-load transfer, the super-lifting device lies flat on the basic wall. Limited by the length of the basic boom and the position of the control room, the length of the super-lifting structure in the transfer state is limited and cannot be changed indefinitely. In this patent, the maximum super-lifting structure length in the transfer state is set to CQ_L. For the solution with a fixed super-lifting length, the maximum design value of the super-lifting length is CQ_L. For the telescopic super-lifting structure design solution, since the super-lift adopts an inner and outer two-section structure, its overlap ratio cannot be less than 0.1, and the maximum design value of the telescopic super-lifting length is 1.7*CQ_L. For the patent solution of the present invention, the foldable super-lifting structure can achieve an effective length of 2*CQ_L.

[0044] In general products, every 10% increase in the superlift length results in an 8%-12% performance improvement. Compared to fixed-length superlift solutions, the foldable superlift solution offers a performance improvement of approximately 90%, and compared to retractable superlift solutions, the foldable superlift solution offers a performance improvement of approximately 30%. This comparison demonstrates that the foldable superlift solution significantly outperforms the other two superlift solutions in terms of performance improvement.

[0045] Furthermore, the significantly increased length of the foldable superlift eliminates the need for space constraints on its installation. During installation and heavy-load transfer, the foldable portion of the superlift can be folded to meet assembly dimensions. This ensures that the overall height of the superlift does not exceed the 4m height limit on conventional roads. Compared to solutions that extend the superlift and tilt it upwards beyond the overall height limit during transport and transfer, this patent offers superior transportability and economical transfer efficiency.

[0046] As shown in FIG5 , the foldable super-lifting device is combined with the main arm to provide multiple working states, namely: fully unfolded working state, fully folded working state, intermediate tensioned working state and extreme tensioned working state.

[0047] The fully deployed and ultimate tension states represent the two extremes of superlift tensioning during lifting operations, while the intermediate tension state lies between these two. The secondary deployment angle β in the intermediate tension state is somewhere between 0° and the ultimate tension state β'. Depending on product design, the secondary deployment angle β' in the ultimate tension state can reach a maximum of the primary deployment angle α. The fully folded state is primarily used during component installation and transport.

[0048] The foldable mechanism enables two-stage superlift deployment, significantly varying the lateral deployment range. During use, the superlift's first and second stage deployment modes can be switched based on different boom length combinations. The effective superlift length and deployment angle can be adjusted to optimize the superlift length and crane boom length, fully enhancing boom strength and rigidity, reducing the stress on the superlift itself, and improving boom safety and stability.

[0049] A multi-angle tensioning control system is implemented based on the above-mentioned crane, including: a force limiter system, a display system, an arm position detection device, a super-lifting first angle sensor, a super-lifting second angle sensor, a super-lifting winch encoder and a super-lifting tension sensor and other components.

[0050] The force limiter system is an independent computer-controlled safety operating system on the crane. It can automatically detect the mass of the load being hoisted by the crane, the angle of the main arm, the super-lifting tension, the super-lifting two-stage deployment angle, and can display the data on the display system.

[0051] The arm position detection device is used to detect the position of each section of the main arm and whether the arm pin is inserted, determine the main arm combination and main arm length, and further determine the corresponding super-lift tensioning scheme through the detection of the main arm length and combination, that is, the corresponding super-lift first-level opening angle and second-level expansion angle and tensioning force.

[0052] The primary superlift angle sensor detects the deployment angle of the fixed superlift boom relative to the main boom, known as the primary superlift deployment angle α. The secondary superlift angle sensor detects the deployment angle of the foldable superlift boom relative to the fixed superlift boom, known as the secondary superlift deployment angle β. Preferably, different main boom lengths and combinations are matched to different primary and secondary deployment angles to maximize boom performance. The superlift angle sensors are located on both the fixed superlift boom and the foldable superlift boom.

[0053] The super hoist encoder is used to detect and record the number of teeth on the hoist and the corresponding hoist rotation angle. This data is matched with the main boom length and combination to better and more effectively improve the strength and rigidity of the boom. The super hoist encoder is located on the super hoist.

[0054] Before the lifting operation, the control system realizes the tensioning of the foldable super lift by detecting and controlling the angles of various angle sensors and super lift winches.

[0055] This patent achieves the maximum load-bearing capacity of the boom by optimizing the relationship between the first and second stage opening angles of the superlift and different boom lengths. During tensioning control, strict identification and detection of the first and second stage opening angles are required to ensure application safety. Different first and second stage opening angles achieve different effective superlift lengths.

[0056] As shown in FIG6 , the multi-angle tensioning control method of the present application includes the following steps:

[0057] S1. Install the foldable superlift device and check whether the crane is ready for lifting the boom.

[0058] S2. Unlock the oil cylinder and winch of the superlift device to make the main boom ready for extension.

[0059] S3: The main boom is extended to the specified boom length combination and the boom is adjusted to the corresponding main boom angle;

[0060] S4. Based on the main boom length combination, the super lifting device performs a first-stage deployment, so that the first-stage deployment angle α reaches a specified angle. The first-stage deployment angle is the angle between the fixed boom and the main boom;

[0061] S5. The superlift device performs secondary deployment according to the main boom length combination, so that the secondary deployment angle β reaches a specified angle. The secondary deployment angle is the angle between the fixed boom and the folding boom.

[0062] S6. Reconfirm whether the two-stage deployment angle of the super lifting device matches the corresponding arm length combination of the main arm. If not, readjust it;

[0063] S7. After confirming that the two-stage deployment angle of the super-lifting device is correct, the super-lifting tension is carried out. When the winch reaches the specified rotation angle, the winch is locked;

[0064] S8. Use the super-lifting tension sensor to check whether the super-lifting tensioning force meets the design requirements. If not, unlock the super-lifting winch, adjust the number of winch teeth, re-tension, and lock;

[0065] S9. After the tensioning force meets the design value, carry out lifting.

[0066] After the super-lifting device is used, the super-lifting winch must be unlocked and the tension state released before the telescopic arm can be operated.

Claims

1. A foldable superlift device, comprising a superlift boom (1), and a superlift base and a superlift winch (2) disposed at two ends of the superlift boom, wherein the superlift boom (1) comprises a fixed boom (101) connected to the superlift base and a folding boom (102) connected to the superlift winch (2), and the folding boom (102) is connected to the fixed boom (101) via a pivot shaft, achieving length adjustment of the superlift boom (1) by means of unfolding and foldingwherein a first connection point (103) is provided on one side of joining ends of the fixed boom (101) and the folding boom (102), and connection is made via a fixed pivot shaft;wherein a second connection point (104) and a third connection point (105) are also respectively provided on the other side of the joining ends of the fixed boom (101) and the folding boom (102) and on boom sides of the fixed boom (101) and the folding boom (102), and connections are made via pin assemblies; when the fixed boom (101) and the folding boom (102) are not folded, a position of the second connection point (104) is fixed via the pin assembly; when the fixed boom (101) and the folding boom (102) are fully folded, a position of the third connection point (105) is fixed via the pin assembly;wherein the pin assembly is an automatic insertion-and-extraction device; andwherein the fixed boom (101) and the folding boom (102) are connected via a crankrocker assembly (106), and driving is realized by a drive element (107) to control the crank-rocker assembly (106) to swing, thereby driving the folding boom (102) to perform folding / unfolding actions.

2. A crane, wherein the foldable superlift device according to claim 1 is provided on a telescopic main boom of the crane.

3. A multi-angle tensioning control system, wherein the multi-angle tensioning control system, implemented based on the crane according to claim 2, comprises: 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.2023453040   22 Jun 20264. A multi-angle tensioning control method, wherein the multi-angle tensioning control method, employing the multi-angle tensioning control system according to claim 3, comprises 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 a 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 p 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; andS9, performing load lifting after the tensioning force meets a design value.

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