crane

Abstract

This invention provides a crane with a boom mounted on a chassis and capable of variable-amplitude rotation relative to the chassis in a vertical plane. A super-boom can rotate relative to the boom in both vertical and horizontal planes, driving the boom's variable-amplitude rotation. A lateral tension adjustment mechanism is connected between the two super-booms, capable of extending and retracting relative to the super-booms and adjusting the lateral tension length to laterally limit the super-booms in a horizontal plane. In a preparation and verification mode, the controller is configured to: acquire the operating condition command and the initial lateral tension length of the lateral tension adjustment mechanism; release the rated lifting capacity limit of the boom; and enter the lifting protection mode. This invention, by adding a lateral tension adjustment mechanism between the two super-booms, limits the outward bending tendency of the super-booms, reducing their deformation and stress. Furthermore, by matching the operating condition command with the initial lateral tension length and initial super-boom swing angle, it completes the preparation and verification of the boom before formal operation, eliminating operational safety risks and improving the crane's operational safety.

Description

Technical Field

[0001] This invention belongs to the field of engineering machinery technology, and in particular relates to a crane. Background Technology

[0002] Existing cranes typically employ superlift devices as auxiliary lifting structures. During operation, these devices are subjected to their own weight and the tension of the wire ropes, leading to significant stress and deformation, thus reducing their operational stability. With the increasing design lifting capacity in the construction machinery industry, the forces on superlift devices will continue to grow, resulting in greater stress and deformation. However, the design of more complex superlift device structures to meet performance requirements is limited by length and weight standards. Furthermore, the status of the superlift device cannot be monitored during crane operations, resulting in significant safety risks during crane operations. Summary of the Invention

[0003] The main objective of this invention is to propose a crane that addresses the technical problems of poor operational stability and high safety risks in existing lifting devices.

[0004] To achieve the above objectives, the present invention provides a crane, comprising: a lifting device including a chassis and a lifting boom mounted on the chassis and capable of variable-amplitude rotation relative to the chassis in a vertical plane; a superlift device including a lateral adjustment mechanism and two superlift booms mounted in a V-shape on the lifting boom, the superlift booms being capable of rotating relative to the lifting boom in both the vertical and horizontal planes, and driving the lifting boom to rotate with variable amplitude; the lateral adjustment mechanism being connected between the two superlift booms, the lateral adjustment mechanism being capable of extending and retracting relative to the superlift booms and adjusting the lateral extension length to laterally limit the superlift booms in the horizontal plane; and a controller for acquiring working condition commands and entering a preparation verification mode according to the working condition commands, the controller being configured in the preparation verification mode to: acquire the initial lateral extension length of the lateral adjustment mechanism; if the initial lateral extension length matches the working condition command, acquire the initial superlift swing angle between the two superlift booms; if the initial superlift swing angle matches the working condition command, release the rated lifting capacity limit of the lifting boom and enter a lifting protection mode.

[0005] In this embodiment of the invention, the controller is further configured to: acquire the actual lifting weight of the lifting boom; when the actual lifting weight is greater than a preset weight, acquire the real-time lateral pull length of the lateral pull adjustment mechanism and the real-time super-lift swing angle between the two super-lift booms, wherein the preset weight is less than the rated lifting weight and greater than the unloaded weight of the lifting boom; when the real-time lateral pull length and the real-time super-lift swing angle both match the working condition command, enter the normal operation mode and control the lifting boom to perform lifting actions.

[0006] In this embodiment of the invention, the crane further includes an alarm device electrically connected to the controller, and the controller is further configured to: control the alarm device to issue a pre-alarm and limit the rated lifting capacity of the crane when one of the initial lateral stretch length and the initial overlift swing angle does not match the working condition command.

[0007] In this embodiment of the invention, the alarm device includes an audible and visual alarm and a fault information display.

[0008] In this embodiment of the invention, the controller is further configured to: when at least one of the real-time horizontal stretching length and the real-time overlift swing angle does not match the working condition command, control the alarm device to issue a work alarm, limit the rated lifting capacity of the crane, and perform dynamic unlock verification; if the dynamic unlock verification is successful, control the crane boom to perform forced operation; if the dynamic unlock verification fails, restrict the movement of the crane boom.

[0009] In this embodiment of the invention, the controller is further configured to return from the hoisting protection mode to the preparation verification mode if the actual hoisting weight is not greater than the preset weight.

[0010] In this embodiment of the invention, the horizontal adjustment mechanism includes:

[0011] A horizontal pull assembly includes at least two pull plates nested from the inside out. The inner pull plate can slide and extend relative to the outer pull plate. A length detector for detecting the length of the horizontal pull assembly is provided on the pull plate. The length detector is electrically connected to the controller.

[0012] A horizontal pull rope, the horizontal pull assembly is installed on one of the superlift booms, the tail end of the horizontal pull rope is installed on the other superlift boom, and the head end is connected to the pull plate located on the inside.

[0013] In this embodiment of the invention, the super boom is provided with a mounting base, the pull plate is connected to one of the mounting bases, the horizontal pull rope is connected to the other mounting base, the head end of the super boom is mounted on the lifting boom, the super boom is provided with a bracket to support the horizontal pull rope, the bracket is located between the head end of the super boom and the mounting base, and the bracket is provided with an opening for the horizontal pull rope to pass through.

[0014] In this embodiment of the invention, the bracket includes: a support plate, forming an installation space between the two lifting arms, the support plate extending from the lifting arms into the installation space; and a baffle connected to the tail end of the support plate and used to limit the horizontal pull rope.

[0015] In this embodiment of the invention, a plurality of the brackets are spaced apart along the length direction of the lifting arm.

[0016] Through the above technical solutions, the crane provided by the embodiments of the present invention has the following beneficial effects:

[0017] When the crane needs to perform lifting operations, the operator can adjust the horizontal extension length of the horizontal extension adjustment mechanism according to the working conditions. After rotating the super boom from its horizontal position to a vertical position on the vertical plane, the two super booms are moved back to back on the horizontal plane according to the working conditions, so that the super boom swing angle between the two super booms is increased, so that the super boom swing angle and the horizontal extension length are matched. The horizontal extension adjustment mechanism is then tightened laterally, thereby limiting the tendency of the super boom to bend outward, achieving the purpose of reducing deformation and stress, and putting the crane into the working preparation state. Before formal operation, operators can input working condition commands to the controller according to the working conditions. After receiving the working condition commands, the controller can enter the preparation and verification mode and first obtain the initial lateral tension length of the lateral tension adjustment mechanism. If the initial lateral tension length matches the working condition commands, the initial super-lift swing angle between the booms can be obtained. If the working condition commands and the initial super-lift swing angle match, the rated lifting capacity limit of the boom is released, completing the self-identification and monitoring of the crane's posture during the operation preparation stage. This makes the judgment of the crane's status more accurate, eliminates the danger caused by accidental operation by the operator, and enters the lifting protection mode. This invention, by adding a lateral tension adjustment mechanism between the two super-lift booms, limits the outward bending tendency of the super-lift booms, reduces the deformation and stress of the super-lift booms, and completes the preparation and verification of the booms before formal operation by matching the working condition commands with the initial lateral tension length and the initial super-lift swing angle. This eliminates the safety risks of operation and improves the operation safety of the crane.

[0018] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0019] The accompanying drawings are provided to illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 This is a structural schematic diagram of a crane in one state according to an embodiment of the present invention;

[0021] Figure 2 yes Figure 1 An enlarged schematic diagram of the horizontal adjustment mechanism in the middle;

[0022] Figure 3 This is a front view structural schematic diagram of the super-lifting device of a crane in a horizontally placed state according to another embodiment of the present invention.

[0023] Figure 4 This is a top view of the lifting device of a crane in a horizontally placed state according to an embodiment of the present invention.

[0024] Figure 5 This is a schematic diagram of the connection principle of a crane according to another embodiment of the present invention.

[0025] Explanation of reference numerals in the attached figures

[0026] Label Name Label Name

[0027] 100 Crane 222 Mounting Base

[0028] 1 A-frame 3 controller

[0029] 2. Over-start device; 4. Alarm device

[0030] 21 Horizontal adjustment mechanism 41 Audible and visual alarm

[0031] 211 Horizontal tension assembly 42 Fault information display

[0032] 2111 Pulling Plate 5 Luffing Cylinder

[0033] 2112 Length detector 6 Swing cylinder

[0034] 212 Horizontal tension rope 7 Angular displacement sensor

[0035] 22 Superlift boom 8 Torque limiter

[0036] 221 Bracket 9 Solenoid Valve Assembly

[0037] 2211 Bearing plate 10 Installation space

[0038] 2212 baffle Detailed Implementation

[0039] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0040] The crane according to the present invention is described below with reference to the accompanying drawings.

[0041] like Figures 1 to 5As shown, in an embodiment of the present invention, the crane 100 includes a lifting device, a superlift device 2, and a controller 3. The lifting device includes a chassis and a lifting boom mounted on the chassis and capable of variable-amplitude rotation relative to the chassis in a vertical plane. The superlift device 2 includes a lateral adjustment mechanism 21 and two superlift booms 22 mounted in a V-shape on the lifting boom. The superlift booms 22 are capable of rotating relative to the lifting boom in both vertical and horizontal planes, thereby driving the lifting boom to rotate with variable amplitude. The lateral adjustment mechanism 21 is connected between the two superlift booms 22. The lateral adjustment mechanism 21 is capable of variable-amplitude rotation relative to the superlift boom. The boom 22 extends and adjusts its lateral extension length to laterally limit the super-lift boom 22 on the horizontal plane. The controller 3 is used to acquire working condition commands and enter a preparation verification mode based on these commands. In this mode, the controller 3 is configured to: acquire the initial lateral extension length of the lateral extension adjustment mechanism 21; acquire the initial super-lift swing angle between the two super-lift booms 22 if the initial lateral extension length matches the working condition command; and release the rated lifting capacity limit of the boom and enter a lifting protection mode if the initial super-lift swing angle matches the working condition command. In one embodiment, the rated lifting capacity limit of the boom is defined as: limiting the crane's load to the unloaded weight of the boom, allowing only unloaded boom movement and disallowing any additional loads. In other embodiments, the rated lifting capacity limit of the boom can be defined as limiting the crane's load to a specified weight, depending on actual usage requirements.

[0042] Understandably, the vertical plane is parallel to the height direction of the crane 100, and the horizontal plane is perpendicular to the height direction of the crane 100. In this embodiment, the crane boom is provided with an A-frame 1 for connecting the super boom 22. The A-frame 1 can be installed at a specified height of the crane boom according to actual usage requirements. The head end of the super boom 22 is installed on the crane boom and located below the A-frame 1. The tail end of the super boom 22 can be connected to the tail end of the crane boom through a wire rope, and the wire rope is connected to the A-frame 1, which can strengthen the connection stability between the crane boom and the super boom 22.

[0043] The super-lift boom 22 can be driven to rotate relative to the lifting arm in the vertical plane using the existing luffing cylinder 5, and the super-lift boom 22 can be driven to rotate relative to the lifting arm in the horizontal plane using the existing swing cylinder 6. Each super-lift boom 22 is connected to a swing cylinder 6. The controller 3 can be a PLC controller 3. The working condition commands can include lateral extension range information and swing angle range information, which can be set according to actual usage requirements.

[0044] In this embodiment, when the crane 100 needs to perform lifting operations, the operator can adjust the horizontal extension length according to the working conditions, and rotate the super boom 22 from the horizontal position to the vertical position on the vertical plane. Then, according to the working conditions, the two super booms 22 are moved back and forth on the horizontal plane to increase the super boom swing angle between the two super booms 22, so that the super boom swing angle and the horizontal extension length are matched. The horizontal extension adjustment mechanism 21 is then tightened laterally to limit the tendency of the super boom 22 to bend outward, thereby reducing the amount of deformation and stress, and putting the crane 100 into the working preparation state. Before formal operation, the operator can input working condition commands to the controller 3 according to the working condition requirements. After receiving the working condition commands, the controller 3 can enter the preparation verification mode and first obtain the initial horizontal tension length of the horizontal tension adjustment mechanism 21. If the initial horizontal tension length matches the working condition commands, the initial super-lift swing angle between the super booms 22 can be obtained. If the working condition commands and the initial super-lift swing angle match, the rated lifting capacity limit of the crane boom is released, completing the self-identification and monitoring of the crane 100's posture during the work preparation stage. This makes the judgment of the crane 100's status more accurate and eliminates the danger caused by accidental operation by the operator. After the work preparation stage is correct, lifting operation is allowed and the hoisting protection mode is entered. In this embodiment, by adding a horizontal tension adjustment mechanism 21 between the two super booms 22, the outward bending tendency of the super booms 22 is limited, reducing the deformation and stress of the super booms 22. It can also complete the preparation verification of the crane boom before formal operation by matching the working condition commands with the initial horizontal tension length and the initial super-lift swing angle, eliminating the safety risks of the operation and improving the operational safety of the crane 100.

[0045] In this embodiment of the invention, under the hoisting protection mode, the controller 3 is further configured as follows:

[0046] Obtain the actual lifting weight of the crane boom;

[0047] When the actual load weight is greater than the preset weight, the real-time horizontal pull length of the horizontal pull adjustment mechanism 21 and the real-time super-lift swing angle between the two super-lift booms 22 are obtained, wherein the preset weight is less than the rated lifting weight and greater than the unloaded weight of the lifting boom.

[0048] When the real-time horizontal pull length, real-time over-lift swing angle and working condition command are matched, the normal operation mode is entered and the crane boom is controlled to perform lifting actions.

[0049] In this embodiment, when the controller 3 enters the lifting protection mode, it can obtain the actual lifting weight of the crane boom. Specifically, a weight sensor can be used to detect the actual lifting weight of the crane boom. If the controller 3 obtains that the actual lifting weight is greater than the preset weight, it can obtain the real-time lateral extension length and real-time super-lift swing angle between the two super-lift booms 22. When the real-time lateral extension length and real-time super-lift swing angle match the working condition command, the controller 3 enters the normal operation mode and controls the crane boom to perform lifting actions. This optimizes the protection of the crane 100 during the operation phase. Based on the lateral protection of the super-lift boom 22 by the lateral extension adjustment mechanism 21, the controller 3 detects and ensures the working posture of the super-lift boom 22 in real time, realizing posture detection of the crane 100 throughout the entire operation process and actively intervening and guiding to ensure the normal operation of the crane 100. This achieves full protection during the operation preparation stage and the lifting process, further improving the operational safety of the crane 100.

[0050] In this embodiment of the invention, the crane 100 further includes an alarm device 4 electrically connected to the controller 3, and the controller 3 is further configured to:

[0051] If either the initial horizontal stretch length or the initial over-lift swing angle does not match the working condition command, the control alarm device 4 will issue a pre-alarm and limit the rated lifting capacity of the crane 100.

[0052] In this embodiment, when the controller 3 enters the preparation verification mode, specifically when the initial horizontal pull length or the initial over-lift swing angle does not match the working condition command, the alarm device 4 is controlled to issue a pre-alarm, limiting the rated lifting capacity of the crane 100. At the same time, it can remind the operator to perform fault detection and attitude adjustment on the crane 100, thereby improving the human-machine interaction and intelligence of the crane 100.

[0053] like Figure 5 As shown, in one embodiment, the alarm device 4 includes an audible and visual alarm 41 and a fault information display 42. In this embodiment, the fault information display 42 can be a client-side application from the prior art, and the audible and visual alarm 41 can be a multi-color light alarm from the prior art, emitting corresponding prompts. This allows operators to quickly detect faults in the crane 100, thereby improving the operating efficiency of the crane 100.

[0054] In this embodiment of the invention, the controller 3 is further configured as follows:

[0055] If at least one of the real-time horizontal stretching length and real-time overlift swing angle does not match the working condition command, the control alarm device 4 will issue an operation alarm, limit the rated lifting capacity of the crane 100, and perform dynamic unlocking verification.

[0056] If the dynamic unlocking verification is successful, control the crane boom to perform forced operation;

[0057] If dynamic unlocking verification fails, the crane boom's movement will be restricted.

[0058] In this embodiment, the controller 3 can be pre-loaded with a random password. If the controller 3 detects a mismatch between at least one of the real-time horizontal extension length and the real-time super-lift swing angle and the operating condition command, the controller 3 can control the alarm device 4 to issue a corresponding operational alarm and limit the rated lifting capacity of the boom. Simultaneously, it prompts the operator to perform dynamic unlock verification. If the operator inputs the unlock password through the controller 3, and the controller 3 successfully verifies the unlock password dynamically, it can control the boom to perform forced operation. If the controller 3 fails to verify the unlock password dynamically, it can restrict the boom's hoisting and luffing actions through the solenoid valve group 9, preventing the boom from performing lifting operations. In this embodiment, specifically in the event of abnormalities in the super-lift boom 22 and the horizontal extension adjustment mechanism 21, the alarm, limitation of the boom's rated lifting capacity, and dynamic unlock verification further improve the operational safety of the crane 100 and prevent abnormal operation of the crane 100.

[0059] In one embodiment, the controller 3 is further configured to:

[0060] If the actual load weight does not exceed the preset weight, return from the lifting protection mode to the preparation verification mode.

[0061] In this embodiment, when the controller 3 detects that the actual load weight of the crane boom is not greater than the preset weight, it returns to the preparation verification mode, which avoids the situation where the crane 100 will issue an operation alarm when there is no actual load, and further improves the operation intelligence of the crane 100.

[0062] In this embodiment of the invention, the horizontal adjustment mechanism 21 includes a horizontal pull assembly 211 and a horizontal pull rope 212. The horizontal pull assembly 211 includes at least two pull plates 2111 nested from the inside out. The inner pull plate 2111 can slide and extend relative to the outer pull plate 2111. A length detector 2112 for detecting the length of the horizontal pull assembly 211 is provided on the pull plate 2111. The length detector 2112 is electrically connected to the controller 3. The horizontal pull assembly 211 is installed on one of the super-lift arms 22. The tail end of the horizontal pull rope 212 is installed on the other super-lift arm 22, and the head end is connected to the inner pull plate 2111.

[0063] Understandably, the cross rope 212 can be made of steel wire rope in the prior art, and the length detector 2112 can be made of proximity switch, limit switch, image recognition device, etc. in the prior art; the included angle between the super booms 22 can be detected by angular displacement sensor 7 or encoder, etc., and the angular displacement sensor 7 can be set at the head end of the super boom 22.

[0064] like Figures 2 to 4 As shown, in one embodiment, the horizontal tension assembly 211 includes three sequentially nested and slidably connected tension plates 2111. Each tension plate 2111 has a groove. The innermost tension plate 2111 is connected to the horizontal tension rope 212, facilitating length adjustment of the rope. The tension of the rope restricts the outward bending tendency of the boom 22, reducing deformation and stress. Positioning holes are provided on the tension plates 2111, allowing for the fixing of their relative positions using pins and positioning holes. This adjusts the horizontal tension length of the adjustment structure. The structure is simple and easy to adjust, improving the operating efficiency of the crane 100.

[0065] In this embodiment of the invention, the super boom 22 is provided with a mounting base 222, a pull plate 2111 is connected to one of the mounting bases 222, and a horizontal pull rope 212 is connected to the other mounting base 222. The head end of the super boom 22 is mounted on the lifting arm, and a bracket 221 for supporting the horizontal pull rope 212 is provided on the super boom 22. The bracket 221 is located between the head end of the super boom 22 and the mounting base 222, and the bracket 221 has an opening for the horizontal pull rope 212 to pass through. Figure 4 As shown, when the boom 22 is placed horizontally, the horizontal tie rope 212 can be bent and laid flat inside the bracket 221. When the boom 22 is lifted from a horizontal position parallel to the height direction of the crane 100 to a vertical position, the horizontal tie rope 212 can be released from the bracket 221 through the opening, and then the swing cylinder 6 drives the boom 22 to move in opposite directions to the specified angle, completing the conversion of the boom 22 from the retracted state to the extended state. The process of switching the boom 22 from the extended state to the retracted state is the opposite of the conversion process from the retracted state to the extended state. The process of raising and lowering the horizontal tie rope 212 is simple and easy to operate.

[0066] Furthermore, the height of the mounting base 222 is higher than that of the bracket 221, which ensures that when the two booms 22 move in opposite directions and open, the horizontal rope 212 can detach from the bracket 221. When the booms 22 rotate to the horizontal position, the horizontal rope 212 can automatically fall back to the bracket 221 under its own weight.

[0067] In this embodiment of the invention, the bracket 221 includes a support plate 2211 and a baffle 2212; an installation space 10 is formed between the two lifting arms 22, and the support plate 2211 extends from the lifting arms 22 into the installation space 10; the baffle 2212 is connected to the tail end of the support plate 2211 and is used to limit the horizontal tie rope 212. The bracket 221 in this embodiment has an L-shaped cross-section, a simple structure, and is easy to manufacture and install. In one embodiment, multiple brackets 221 are spaced apart along the length of the lifting arms 22. The cooperation of multiple brackets 221 facilitates the support of the horizontal tie rope 212 and prevents the horizontal tie rope 212 from detaching from the bracket 221 and interfering with other components in a horizontal state.

[0068] In one embodiment, the crane 100 further includes a torque limiter 8 for detecting the actual load weight of the boom and the angle of the boom. The controller 3 can receive operating condition commands set by the operator through the torque limiter 8, determine whether the operating condition settings of the crane 100 meet the actual requirements, and determine whether the posture of the crane 100 is dangerous. If the settings are incorrect or the posture of the crane 100 is abnormal, the controller 3 can control the sending of corresponding alarm information to the client for display.

[0069] In one embodiment, the crane 100 has different requirements for the super-lift swing angle under different working conditions. Since the installation position of the super-lift boom 22 relative to the crane boom is fixed, for a given working condition, the first step is to determine whether the horizontal tension length of the tie rope 212 is correct. If it is incorrect, an audible and visual alarm is triggered to remind the operator to adjust the position of the tie plate 2111. As shown in the table below, the super-lift device 2 has three working conditions, each with a corresponding specified swing angle, specified horizontal tension length, horizontal tension variation, and swing angle variation. The horizontal tension range corresponds to the specified horizontal tension length ± the horizontal tension variation, and the swing angle range corresponds to the specified swing angle ± the swing angle variation. The first working condition corresponds to C1, S1, ΔS1, and ΔC1.

[0070]

[0071] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0072] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0073] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0074] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A crane, characterized in that The crane (100) comprises: a hoisting device comprising a chassis and a hoisting arm mounted on the chassis and capable of luffing rotation in a vertical plane relative to the chassis; a super-lifting device (2) comprising a horizontal-lifting adjusting mechanism (21) and two super-lifting arms (22) mounted in a V shape on the hoisting arm, the super-lifting arms (22) being capable of rotation in the vertical plane and a horizontal plane relative to the hoisting arm and driving the hoisting arm to luff, the horizontal-lifting adjusting mechanism (21) being connected between the two super-lifting arms (22), the horizontal-lifting adjusting mechanism (21) being capable of extension and retraction relative to the super-lifting arms (22) and adjusting the horizontal-lifting length to laterally limit the super-lifting arms (22) in the horizontal plane; a controller (3) configured to acquire a working condition instruction and enter a preparation verification mode according to the working condition instruction, the controller (3) being configured in the preparation verification mode to: acquire an initial horizontal-lifting length of the horizontal-lifting adjusting mechanism (21); in a case where the initial horizontal-lifting length matches the working condition instruction, acquire an initial super-lifting swing angle between the two super-lifting arms (22); in a case where the initial super-lifting swing angle matches the working condition instruction, release a rated lifting capacity limit of the hoisting arm and enter a lifting protection mode; in the lifting protection mode, the controller (3) is further configured to: acquire an actual lifting load of the hoisting arm; in a case where the actual lifting load is greater than a preset weight, acquire a real-time horizontal-lifting length of the horizontal-lifting adjusting mechanism (21) and a real-time super-lifting swing angle between the two super-lifting arms (22), wherein the preset weight is less than the rated lifting capacity and greater than an empty load of the hoisting arm; in a case where the real-time horizontal-lifting length and the real-time super-lifting swing angle both match the working condition instruction, enter a normal operation mode and control the hoisting arm to perform a hoisting action.

2. The crane of claim 1, wherein, The crane (100) further comprises an alarm device (4) electrically connected with the controller (3), and the controller (3) is further configured to: in a case where one of the initial horizontal-lifting length and the initial super-lifting swing angle does not match the working condition instruction, control the alarm device (4) to perform a preliminary alarm and limit the rated lifting capacity of the crane (100).

3. The crane of claim 2, wherein, The alarm device (4) comprises an audible and visual alarm (41) and a fault information display (42).

4. The crane of claim 2, wherein, The controller (3) is further configured to: in a case where at least one of the real-time horizontal-lifting length and the real-time super-lifting swing angle does not match the working condition instruction, control the alarm device (4) to perform an operation alarm, limit the rated lifting capacity of the crane (100) and perform dynamic unlocking verification; in a case where the dynamic unlocking verification is successful, control the hoisting arm to perform a forced operation; in a case where the dynamic unlocking verification fails, limit the hoisting arm from performing an action.

5. The crane of claim 1, wherein, The controller (3) is further configured to: in a case where the actual lifting load is not greater than the preset weight, return from the lifting protection mode to the preparation verification mode.

6. A crane according to any one of claims 1 to 5, characterised in that, The horizontal-lifting adjusting mechanism (21) comprises: The horizontal pulling assembly (211) comprises at least two pulling plates (2111) nested from inside to outside, the pulling plate (2111) on the inside can slide relative to the pulling plate (2111) on the outside, the pulling plate (2111) is provided with a length detector (2112) for detecting the length of the horizontal pulling assembly (211), the length detector (2112) is electrically connected with the controller (3); The horizontal pulling rope (212) is installed in one of the super-lifting arms (22), the tail end of the horizontal pulling rope (212) is installed in the other super-lifting arm (22), and the head end is connected with the pulling plate (2111) on the inside.

7. The crane of claim 6, wherein, The super-lifting arm (22) is provided with a mounting seat (222), the pulling plate (2111) is connected with one of the mounting seats (222), the horizontal pulling rope (212) is connected with the other mounting seat (222), the head end of the super-lifting arm (22) is installed in the lifting arm, the super-lifting arm (22) is provided with a bracket (221) for supporting the horizontal pulling rope (212), the bracket (221) is located between the head end of the super-lifting arm (22) and the mounting seat (222), and the bracket (221) is provided with an opening for the horizontal pulling rope (212) to pass through.

8. The crane of claim 7, wherein, The bracket (221) comprises: A bearing plate (2211), an installation space (10) is formed between the two super-lifting arms (22), the bearing plate (2211) extends from the super-lifting arm (22) to the installation space (10); A baffle (2212) connected to the tail end of the bearing plate (2211) and used for limiting the horizontal pulling rope (212).

9. The crane of claim 7, wherein, A plurality of brackets (221) are arranged along the length direction of the super-lifting arm (22).

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