A sling and method of use thereof

Abstract

This invention relates to the field of lifting technology, specifically a lifting device and its method of use. The lifting device includes a mounting base with a circular outer edge. The mounting base is connected to lifting lugs, a positioning part, a guide part, and a telescopic rod assembly. The telescopic rod assembly is evenly arranged around the circumference of the mounting base and includes a pin that can extend or retract. The lifting lugs are connected to the top of the mounting base and are evenly arranged around the circumference of the mounting base. The positioning part includes a positioning element connected to the top of the mounting base and evenly arranged around the circumference of the mounting base. The positioning element includes a cantilever section extending beyond the outer edge of the mounting base. The guide part extends downward from the side wall of the mounting base and slopes inward, forming a frustum structure with the mounting base. This invention eliminates the need for manual entry into confined spaces for hooking operations, avoiding safety hazards, reducing labor intensity, simplifying lifting coordination, improving work efficiency, and enhancing lifting safety.

Description

Technical Field

[0001] This invention relates to the field of hoisting technology, and in particular to a hoisting tool and its method of use. Background Technology

[0002] Lifting tools are frequently used in transportation operations or engineering fields, especially for the loading and unloading of large components. Often, manual assistance is required to attach the hook of the lifting tool to the lifting lug of the component to complete the assembly work before lifting.

[0003] For some complex components with limited internal space, the lifting points and lugs are located inside the bottom. These components are characterized by confined space, poor lighting, enclosed environment, and poor ventilation. Before each lifting operation, construction workers must use ladders several meters long to enter the component from the top to locate and connect the lifting ropes to the pre-set lifting points. This process carries extremely high safety risks, including falls from heights, being struck by objects, suffocation, and heatstroke.

[0004] Manual hooking is extremely laborious and time-consuming. Operators need to repeatedly perform a series of actions such as entering, searching, hooking, and exiting in harsh environments, resulting in huge labor intensity, extremely low work efficiency, and serious constraints on the overall work progress.

[0005] The pre-hoisting hooking process relies entirely on the physical strength, experience, and attention of personnel, which carries the risk of operational errors such as improper hooking or loose connection. At the same time, communication is inconvenient and collaborative work is difficult in a confined space, further amplifying the safety risks. Summary of the Invention

[0006] The purpose of this invention is to address the limitations of existing technologies where the hoisting and unloading of large components relies on manual connection of hooks, ropes, and lugs, resulting in high-risk working environments, high labor intensity, low efficiency, and significant limitations. This invention provides a hoisting tool and its usage method.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] In a first aspect, the present invention provides a lifting device, comprising a mounting base with a circular outer edge, wherein the mounting base is connected to lifting lugs, a positioning part, a guide part, and at least eight telescopic rod assemblies; all the telescopic rod assemblies are located in the same horizontal plane and are evenly arranged circumferentially along the mounting base, each telescopic rod assembly includes a pin, and all the pins are capable of extending or retracting relative to the mounting base in the horizontal plane; the lifting lugs include a plurality of lugs connected to the top of the mounting base and evenly arranged circumferentially along the mounting base; the positioning part includes a plurality of positioning elements connected to the top of the mounting base and evenly arranged circumferentially along the mounting base, each positioning element including a cantilever section extending out of the outer edge of the mounting base, all the cantilever sections being located in the same horizontal plane, and the vertical distance between the bottom of the cantilever section and the top of the pin is sufficient to accommodate the crossbeam at the top of the object to be lifted; the guide part extends downward from the side wall of the mounting base and slopes inward, the guide part and the mounting base forming a frustum structure.

[0009] Using the lifting device described in this invention, the lifting device is connected to a crane via the connection of the lifting lugs and the lifting rope, realizing the overall movement of the lifting device; the inwardly inclined frustum structure of the guide part can guide the lifting device to the middle position of the object to be lifted, achieving coarse positioning of the lifting device; the cantilever section of the positioning part extends beyond the outer edge of the mounting base, so that at least part of the positioning member, after the lifting device is guided to be centered by the guide part, can be placed on the crossbeam of the object to be lifted, achieving fine positioning of the lifting device; after positioning by the positioning part, at least part of the pin of the telescopic rod assembly extends, reaching the bottom position of the crossbeam, thereby enabling the lifting device to be lifted. The object to be lifted comprises at least eight telescopic rod assemblies evenly arranged around the circumference of the mounting base. This ensures that even under the most unfavorable conditions, the telescopic rod assemblies, after extension, can still engage with the crossbeam. The automatic extension and retraction of the telescopic rod assemblies enables rapid lifting and engagement or unlocking of the lifting device and the object to be lifted. Therefore, manual entry into confined spaces for hooking operations is unnecessary, avoiding safety hazards, reducing labor intensity, simplifying the lifting engagement method, and improving work efficiency. The cantilever section and the pin limit the vertical movement of the crossbeam, while the outer edge of the mounting base limits the horizontal movement of the crossbeam, achieving a limiting connection between the lifting device and the object to be lifted, enhancing lifting safety. This lifting device has a simple structure, is easy to use, and performs well.

[0010] As a preferred embodiment of the present invention, the positioning element and the pin are respectively configured to correspond one-to-one.

[0011] With this structural design, the number and distribution of the positioning elements and pins on the mounting base remain consistent. The positioning part can be placed on the crossbeam even under the most unfavorable working conditions, without the need for repeated crane operations to align the positioning part with the crossbeam.

[0012] As a preferred embodiment of the present invention, the lifting lugs and the pins are configured in a one-to-one correspondence.

[0013] With this structural design, the mounting base corresponding to the pin position needs to be locally reinforced because it has to bear the lifting force. Placing the lifting lug here facilitates the direct transmission of the lifting force and reduces the need for overall reinforcement of the mounting base.

[0014] As a preferred embodiment of the present invention, each telescopic rod assembly further includes a driving component and a slide block. The slide block is connected to the mounting base, the pin is slidably connected to the slide block, and the driving component is connected to the mounting base and drives the pin to extend and retract along the slide block.

[0015] As a further preferred embodiment of the present invention, each of the pins is connected to the corresponding driving component through the hinge portion, and the driving component is hinged to the mounting base.

[0016] As a further preferred technical solution of the present invention, the driving component adopts a hydraulic cylinder, a pneumatic cylinder or an electric cylinder.

[0017] As a further preferred technical solution of the present invention, when the driving component is a hydraulic cylinder or a pneumatic cylinder, a pump station and a control box are connected to the mounting base, the control box is electrically connected to the pump station, and the pump station is connected to the driving component through a pipeline; when the driving component is an electric cylinder, a control box is connected to the mounting base, and the control box is electrically connected to the driving component.

[0018] As a further preferred technical solution of the present invention, the control box is connected to a cable, and the cable is connected to a cable reel.

[0019] As a further preferred embodiment of the present invention, the control box includes a remote control receiver.

[0020] As a preferred technical solution of the present invention, the guide portion is provided with a stiffening structure.

[0021] Secondly, the present invention also provides a method for using a lifting device, employing the lifting device as described in any of the above claims, the method comprising the following steps: S1. The crane is connected to the lifting lug by a lifting rope. The crane drives the lifting device to be lowered. The guide is inserted between the oppositely arranged crossbeams on the top of the object to be lifted. The guide guides the lifting device to the middle position of the object to be lifted, thereby achieving coarse positioning of the lifting device. S2. The crane continues to lower the lifting device, and the cantilever section of the positioning part is placed on the crossbeam to achieve precise positioning of the lifting device; S3. The pin extends relative to the mounting base, with a portion of the pin extending to the bottom of the crossbeam; S4. The crane lifts the lifting device, and the pin at the bottom of the crossbeam abuts against the crossbeam, thus achieving the cooperation between the lifting device and the object to be lifted.

[0022] The method of using a lifting device according to the present invention connects the lifting device to a crane via the connection of the lifting lugs and the lifting rope, thereby realizing the overall movement of the lifting device. The inwardly inclined frustum structure of the guide portion guides the lifting device to the center position of the object to be lifted, achieving coarse positioning. The cantilever section of the positioning portion extends beyond the outer edge of the mounting base, allowing at least a portion of the positioning components to be placed on the crossbeam of the object to be lifted after the lifting device is aligned by the guide portion, achieving fine positioning. After positioning by the positioning portion, at least a portion of the pin of the telescopic rod assembly extends to the bottom of the crossbeam, enabling the lifting device to be lifted. The lifting device employs at least eight telescopic rod assemblies evenly arranged around the circumference of the mounting base. This ensures that even under the most unfavorable conditions, the extended telescopic rod assemblies can still engage with the crossbeam. The automatic extension and retraction of the telescopic rod assemblies enables rapid lifting and engagement or unlocking of the lifting device and the object to be lifted. Therefore, manual entry into confined spaces for hooking operations is unnecessary, avoiding safety hazards, reducing labor intensity, simplifying the lifting process, and improving work efficiency. The cantilever section and the pin limit the vertical movement of the crossbeam, while the outer edge of the mounting base limits the horizontal movement of the crossbeam, achieving a limiting connection between the lifting device and the object to be lifted, enhancing lifting safety. This method is simple to use, convenient to operate, and yields excellent results.

[0023] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: The present invention discloses a lifting device and its method of use. The lifting device is connected to a crane via the connection of the lifting lugs and the lifting rope, enabling the overall movement of the lifting device. The inwardly inclined frustum structure of the guide portion guides the lifting device to the center position of the object to be lifted, achieving coarse positioning. The cantilever section of the positioning portion extends beyond the outer edge of the mounting base, allowing at least a portion of the positioning components to be placed on the crossbeam of the object to be lifted after the lifting device is aligned by the guide portion, achieving fine positioning. After positioning by the positioning portion, at least a portion of the pin of the telescopic rod assembly extends to the bottom of the crossbeam, enabling the lifting device to be used to lift the object to be lifted. Eight telescopic rod assemblies are evenly arranged around the circumference of the mounting base, ensuring that even under the most unfavorable conditions, the extended telescopic rod assemblies can still engage with the crossbeam. This allows for rapid hoisting and unlocking of the lifting device and the object to be lifted through the automatic extension and retraction of the telescopic rod assemblies. Therefore, manual entry into confined spaces for hooking operations is unnecessary, avoiding safety hazards, reducing labor intensity, simplifying the hoisting process, and improving work efficiency. The cantilever section and the pin limit the vertical movement of the crossbeam, while the outer edge of the mounting base limits the horizontal movement of the crossbeam, achieving a limiting connection between the lifting device and the object to be lifted, enhancing hoisting safety. The lifting device has a simple structure, is easy to use, and the operation method is simple, convenient, and effective. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the elevation structure of the lifting device; Figure 2 A three-dimensional structural diagram of the slide, pin, and hinge. Figure 3 This is a reference diagram showing the usage status of the lifting gear; Figure 4 A schematic diagram illustrating the control principle of wireless remote control for a pumping station; Figure 5 This is a picture of the actual lifting device.

[0025] Marked in the image: 01-Object to be lifted, 02-Crossbeam, 1-Mounting base, 2-Drive component, 3-Slide, 4-Pin, 5-Hinge, 6-Lifting lug, 7-Positioning part, 8-Guide part, 9-Strengthening structure, 10-Pump station, 11-Pipeline, 12-Control box, 13-Cable, 14-Cable reel. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to experimental examples and specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0027] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of the present invention is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the present invention or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a particular device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on the present invention.

[0028] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but that it can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0029] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0030] Furthermore, in the description of the embodiments of the present invention, "several", "more than", and "a number of" represent at least two. The number can be any number, such as 2, 3, 4, 5, 6, 7, 8, or 9, and can even exceed nine.

[0031] Furthermore, in the description of the technical solution of this invention, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0032] In related technologies, for some complex components with limited internal space, such as the inner formwork of caissons, the lifting points and lugs are located at the bottom of the inner formwork. These components are characterized by confined space, insufficient light, enclosed environment, and poor ventilation. Before each hoisting operation, construction workers must use ladders several meters long to enter the inner formwork from the top of the caisson to locate and connect the lifting ropes to the pre-set lifting points. This process carries extremely high safety risks, including falls from heights, being struck by objects, suffocation, and heatstroke. Due to the enormous size of a single caisson inner formwork unit (e.g., 4.5m × 4.5m × 5.5m, weighing over 10 tons) and its complex internal structure, manual hooking operations are extremely laborious and time-consuming. Operators must repeatedly perform a series of actions such as entering, searching, hooking, and exiting in harsh environments, resulting in immense labor intensity, extremely low work efficiency, and severely hindering the overall work progress. The current pre-lifting hooking process relies entirely on the physical strength, experience, and attention of personnel, posing a risk of operational errors such as improper hooking or insecure connection. Furthermore, the confined space hinders communication and collaborative work, further amplifying safety risks. Therefore, the technical solution described in this application was developed. The following section combines... Figures 1 to 5 To elaborate.

[0033] Example 1 like Figures 1 to 5 As shown, the lifting device of the present invention includes a mounting base 1 with a circular outer edge, and the mounting base 1 is connected to a lifting lug 6, a positioning part 7, a guide part 8 and at least eight telescopic rod assemblies.

[0034] like Figures 1 to 3 As shown, all the telescopic rod assemblies are located in the same horizontal plane and are evenly arranged around the mounting base 1. Each telescopic rod assembly includes a driving component 2, a slide 3, and a pin 4. The slide 3 is connected to the mounting base 1, and the pin 4 is slidably connected to the slide 3. All the pins 4 can extend or retract relative to the mounting base 1 in the horizontal plane. The driving component 2 is connected to the mounting base 1 and drives the pins 4 to extend and retract along the slide 3.

[0035] In some alternative implementations, such as Figures 1 to 3 As shown, each of the pins 4 is connected to the corresponding drive component 2 via the hinge 5.

[0036] In some alternative implementations, such as Figure 1 and Figure 3 As shown, the drive component 2 is hinged to the mounting base 1.

[0037] In some alternative implementations, to ensure synchronization accuracy, a synchronous flow divider valve or synchronous motor is used to distribute the flow equally to all the telescopic rod assemblies, achieving synchronous extension / retraction, so as to ensure that each of the pins 4 is subjected to uniform force and moves in a consistent manner.

[0038] like Figure 1 and Figure 3 As shown, the lifting lugs 6 include several, and the lifting lugs 6 are connected to the top of the mounting base 1. The lifting lugs 6 are evenly arranged around the circumference of the mounting base 1. In some optional embodiments, the lifting lugs 6 are arranged in a one-to-one correspondence with the pins 4. With this structure, the mounting base 1 corresponding to the position of the pin 4 needs to be locally reinforced because it has to bear the lifting force. Setting the lifting lugs 6 here facilitates the direct transmission of the lifting force and reduces the overall reinforcement of the mounting base 1.

[0039] like Figure 1 and Figure 3 As shown, the positioning part 7 includes several positioning elements connected to the top of the mounting base 1. The positioning elements are evenly arranged around the circumference of the mounting base 1. Each positioning element includes a cantilever section extending out of the outer edge of the mounting base 1. All the cantilever sections are located in the same horizontal plane, and the vertical distance between the bottom of the cantilever section and the top of the pin 4 is sufficient to accommodate the crossbeam 02 at the top of the object 01 to be lifted. In some optional embodiments, the positioning elements are arranged in a one-to-one correspondence with the pins 4. With this structure, the number of positioning elements and the pins 4 and their distribution positions on the mounting base 1 are consistent. The positioning part 7 can be placed on the crossbeam 02 even under the most unfavorable working conditions, without the need for repeated operation of the crane to position the positioning part 7 and the crossbeam 02.

[0040] like Figure 1 and Figure 3 As shown, the guide portion 8 extends downward from the side wall of the mounting base 1 and slopes inward, and the guide portion 8 and the mounting base 1 form a frustum structure; the guide portion 8 is provided with a stiffening structure 9.

[0041] In some alternative implementations, such as Figure 1 and Figure 3 As shown, the driving component 2 is a hydraulic cylinder, a pneumatic cylinder, or an electric cylinder; when the driving component 2 is a hydraulic cylinder or a pneumatic cylinder, a pump station 10 and a control box 12 are connected to the mounting base 1, the control box 12 is electrically connected to the pump station 10, and the pump station 10 is connected to the driving component 2 through a pipeline 11; when the driving component 2 is an electric cylinder, a control box 12 is connected to the mounting base 1, and the control box 12 is electrically connected to the driving component 2.

[0042] In some alternative implementations, such as Figure 1 As shown, the control box 12 is connected to a cable 13, which is connected to a cable reel 14.

[0043] In some optional embodiments, the control box 12 includes a remote control receiver; when the crane moves the lifting device to the object to be lifted 01 and the positioning part 7 is placed on the crossbeam 02, the operator sends a command via the remote control. After receiving the command, the control box 12 controls the pump station 10 to work. The drive component 2 drives the pin 4 to extend along the slide 3 and insert into the bottom of the crossbeam 02, which can realize the cooperation between the lifting device and the object to be lifted 01. The crane can directly lift the object to be lifted 01. The control principle of wireless remote control can be found in [reference needed]. Figure 4 .

[0044] In some alternative implementations, a gantry crane can be used as the crane, which is connected to the lifting device. The gantry crane's operator's cab integrates a camera display screen, a pump station remote control, and a reel controller. A reel 14 and a camera are installed on the gantry crane's own hoisting winch support. The reel 14 and the camera move synchronously with the winch. The camera is used to observe the lifting device's status in real time. For example, the operator can observe whether the lifting device is guided and aligned by the guide part 8 through the real-time image transmitted from the camera to the camera display screen in the gantry crane's operator's cab. After the positioning part 7 is in place, the pump station remote control is activated, and the operator can observe whether the pin 4 extends and is positioned below the crossbeam 02. Then, the pump station 10 is stopped, and the gantry crane winch and the reel 14 are operated to rotate synchronously for lifting operations. Therefore, the entire operation process can be completed by the operator in the gantry crane's operator's cab without approaching the lifting device or entering the object to be lifted 01 for hooking operations.

[0045] In some alternative embodiments, the reel 14 may be a servo reel, including a reel body and a servo motor, wherein the servo motor drives the reel body to rotate forward and backward, and the controller of the servo motor is connected to a brake.

[0046] In an alternative implementation, the lifting device can be used for the overall lifting of the cage structure.

[0047] In an optional implementation, referring to the applicant's prior Chinese patent application No. 2026103491629, which discloses a caisson inner mold assembly and a method for demolding and hoisting the caisson inner mold, as well as a caisson mold, the hoisting tool described in this embodiment can be applied to the overall hoisting of the inner mold assembly.

[0048] The lifting device described in this embodiment is connected to a crane via the connection of the lifting lug 6 and the lifting rope, enabling the overall movement of the lifting device. The inwardly inclined frustum structure of the guide part 8 guides the lifting device to the center position of the object to be lifted 01, achieving coarse positioning. The cantilever section of the positioning part 7 extends beyond the outer edge of the mounting base 1, allowing at least a portion of the positioning components to be placed on the crossbeam 02 of the object to be lifted 01 after the lifting device is aligned by the guide part 8, achieving fine positioning. After positioning by the positioning part 7, at least a portion of the pin 4 of the telescopic rod assembly extends to the bottom of the crossbeam 02, enabling the lifting device to be used to lift the object to be lifted. The lifting device 01 is equipped with at least eight telescopic rod assemblies evenly arranged around the mounting base 1. This ensures that even under the most unfavorable conditions, the telescopic rod assemblies can still engage with the crossbeam 02 after extension. The automatic extension and retraction of the telescopic rod assemblies enables rapid lifting and engagement or unlocking of the lifting device and the object 01, eliminating the need for manual entry into confined spaces for hooking operations. This avoids safety hazards, reduces labor intensity, simplifies the lifting engagement process, and improves work efficiency. The cantilever section and the pin 4 provide vertical and horizontal limits to the crossbeam 02, while the outer edge of the mounting base 1 provides horizontal and vertical limits to the crossbeam 02, achieving a limiting connection between the lifting device and the object 01, thus enhancing lifting safety. This lifting device has a simple structure, is easy to use, and performs well.

[0049] Example 2 like Figures 1 to 5 As shown, the method of using a lifting device according to the present invention employs the lifting device described in Example 1, and the method includes the following steps: S1. The crane is connected to the lifting lug 6 by a lifting rope. The crane drives the lifting device to be lowered. The guide part 8 falls between the oppositely arranged crossbeams 02 on the top of the object to be lifted 01. The guide part 8 guides the lifting device to the middle position of the object to be lifted 01, thereby achieving coarse positioning of the lifting device. S2. The crane continues to lower the lifting device, and the cantilever section of the positioning part 7 is placed on the crossbeam 02 to achieve precise positioning of the lifting device; S3. The pin 4 extends relative to the mounting base 1, and part of the pin 4 extends to the bottom position of the crossbeam 02; S4. The crane lifts the lifting device, and the pin 4 at the bottom of the crossbeam 02 abuts against the crossbeam 02, realizing the cooperation between the lifting device and the object 01 to be lifted.

[0050] In an optional embodiment, referring to the applicant's prior Chinese patent application No. 2026103491629, which discloses a caisson inner mold assembly and a method for demolding and hoisting the caisson inner mold, and a caisson mold, when the lifting device described in this embodiment can be applied to the overall hoisting of the caisson inner mold assembly, the method for demolding and hoisting the caisson inner mold includes the following steps: Step 1: After the caisson is cast and formed, the inner formwork assembly slides and contracts along the inner formwork truss, separating from the inner wall of the caisson; at this time, the outer edge of the inner formwork assembly separates from the inner wall boundary of the caisson.

[0051] Step 2: Start the reel controller and gantry crane. The gantry crane lowers the lifting device to the lifting coordination area of ​​the inner formwork truss. The reel 14 simultaneously lowers the cable 13. The lifting device is guided by the guide part 8 and falls into the middle position of the inner formwork truss to achieve coarse positioning of the lifting device. The operator observes in real time whether the lifting device is in the middle position of the inner formwork truss through the camera on the hoisting winch support of the gantry crane.

[0052] Step 3: The gantry crane continues to lower the lifting device, and the cantilever section of the positioning part 7 is placed on the beam of the gantry frame, that is, the lifting device is located on the top of the gantry frame, realizing the precise positioning of the lifting device.

[0053] Step 4: Activate the pump station remote control. The pump station 10 provides power to all the drive components 2. The drive components 2 drive the corresponding pins 4 to extend. Some of the pins 4 are inserted into the area between the portal frame and the inner formwork truss body, that is, into the bottom position of the beam of the portal frame. The operator observes in real time through the camera whether the pins 4 are in place. After they are in place, the pump station 10 is turned off by the pump station remote control.

[0054] Step 5: The gantry crane lifts the lifting device, and part of the pin 4 abuts against the bottom of the beam of the portal frame, realizing the cooperation between the lifting device and the inner formwork truss. At this time, the positioning part 7 and the pin 4 limit the portal frame, that is, limit the inner formwork truss, and improve the safety of lifting.

[0055] Step 6: The gantry crane lifts the inner mold assembly of the caisson and simultaneously starts the reel controller to control the reel 14 to reverse and retract the cable 13.

[0056] The method of using a lifting device described in this embodiment involves connecting the lifting device to a crane via the connection of the lifting lug 6 and the lifting rope, thereby achieving the overall movement of the lifting device. The inwardly inclined frustum structure of the guide part 8 guides the lifting device to the center position of the object to be lifted 01, achieving coarse positioning. The cantilever section of the positioning part 7 extends beyond the outer edge of the mounting base 1, allowing at least a portion of the positioning components to be placed on the crossbeam 02 of the object to be lifted 01 after the lifting device is aligned by the guide part 8, achieving fine positioning. After positioning by the positioning part 7, at least a portion of the pin 4 of the telescopic rod assembly extends to the bottom of the crossbeam 02, enabling the lifting device to be lifted. The lifting device 01 is equipped with at least eight telescopic rod assemblies evenly arranged around the circumference of the mounting base 1. This ensures that even under the most unfavorable conditions, the telescopic rod assemblies can still engage with the crossbeam 02 after extension. The automatic extension and retraction of the telescopic rod assemblies enables rapid lifting and engagement or unlocking of the lifting device and the object 01, eliminating the need for manual entry into confined spaces for hooking operations. This avoids safety hazards, reduces labor intensity, simplifies the lifting engagement method, and improves work efficiency. The cantilever section and the pin 4 provide vertical and horizontal limits to the crossbeam 02, while the outer edge of the mounting base 1 provides horizontal and vertical limits to the crossbeam 02, achieving a limiting connection between the lifting device and the object 01, thus enhancing lifting safety. This method is simple to use, convenient to operate, and effective.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A lifting device, characterized in that, Includes a mounting base (1) with a circular outer edge, on which are connected: At least eight telescopic rod assemblies, all of which are located in the same horizontal plane and are evenly arranged around the mounting base (1), each of which includes a pin (4), all of which are capable of extending or retracting relative to the mounting base (1) in the horizontal plane; The lifting lugs (6) include a plurality of them, the lifting lugs (6) are connected to the top of the mounting base (1), and the lifting lugs (6) are evenly arranged around the circumference of the mounting base (1); The positioning part (7) includes several positioning components connected to the top of the mounting base (1). The positioning components are evenly arranged around the circumference of the mounting base (1). The positioning component includes a cantilever section extending out of the outer edge of the mounting base (1). All the cantilever sections are located in the same horizontal plane, and the vertical distance between the bottom of the cantilever section and the top of the pin (4) can accommodate the crossbeam (02) at the top of the object to be lifted (01). The guide portion (8) extends downward from the side wall of the mounting base (1) and slopes inward, and the guide portion (8) and the mounting base (1) form a frustum structure.

2. The lifting device according to claim 1, characterized in that, The positioning element is set in a one-to-one correspondence with the pin (4).

3. The lifting device according to claim 1, characterized in that, The lifting lug (6) and the pin (4) are set in a one-to-one correspondence.

4. The lifting device according to claim 1, characterized in that, Each of the telescopic rod assemblies further includes a drive component (2) and a slide (3), the slide (3) being connected to the mounting base (1), the pin (4) being slidably connected to the slide (3), and the drive component (2) being connected to the mounting base (1) and driving the pin (4) to extend and retract along the slide (3).

5. The lifting device according to claim 4, characterized in that, Each of the pins (4) is connected to the corresponding drive component (2) via the hinge (5), the drive component (2) being hinged to the mounting base (1).

6. The lifting device according to claim 4, characterized in that, The drive component (2) is a hydraulic cylinder, a pneumatic cylinder, or an electric cylinder.

7. The lifting device according to claim 6, characterized in that, When the driving component (2) is a hydraulic cylinder or a pneumatic cylinder, a pump station (10) and a control box (12) are connected to the mounting base (1). The control box (12) is electrically connected to the pump station (10), and the pump station (10) is connected to the driving component (2) through a pipeline (11). When the drive component (2) is an electric cylinder, a control box (12) is connected to the mounting base (1), and the control box (12) is electrically connected to the drive component (2).

8. The lifting device according to claim 7, characterized in that, The control box (12) is connected to a cable (13), which is connected to a reel (14).

9. The lifting device according to any one of claims 1-8, characterized in that, The guide section (8) is provided with a stiffening structure (9).

10. A method of using a lifting device, characterized in that, Using the lifting device as described in any one of claims 1-9, the method includes the following steps: S1. The crane connects to the lifting lug (6) via a lifting rope. The crane lowers the lifting device. The guide part (8) falls between the oppositely arranged crossbeams (02) on the top of the object to be lifted (01). The guide part (8) guides the lifting device to the middle position of the object to be lifted (01), thereby achieving coarse positioning of the lifting device. S2. The crane continues to lower the lifting device, and the cantilever section of the positioning part (7) is placed on the crossbeam (02) to achieve precise positioning of the lifting device; S3, the pin (4) extends relative to the mounting base (1), and part of the pin (4) extends to the bottom position of the crossbeam (02); S4. The crane lifts the lifting device, and the pin (4) at the bottom of the crossbeam (02) abuts against the crossbeam (02), so as to realize the cooperation between the lifting device and the object to be lifted (01).

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