Rotary lifting clamp
By designing a rotary lifting clamp, the problems of deformation and space occupation during paper roll handling were solved, enabling precise clamping and damage-free loading of paper rolls, thus improving transportation efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-03
- Publication Date
- 2026-03-24
AI Technical Summary
Existing clamps are prone to causing deformation of the edges and corners of paper rolls and occupying space when handling paper rolls, and may also touch surrounding paper rolls during rotation.
A rotary lifting clamp was designed, which achieves precise clamping and pitch angle control of paper rolls through independently driven lifting brackets and rotary assemblies. Combined with distance and load sensors, it ensures the correct positioning and protection of the paper rolls.
It enables damage-free handling and compact loading of paper rolls, avoiding deformation of paper roll edges and corners and collisions during rotation, thus improving transportation efficiency.
Smart Images
Figure CN224030116U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of clamp, specifically points to a kind of rotary lifting clamp. BACKGROUND
[0002] In the automatic loading and unloading of material, the material is loaded from the supply into the transport vehicle, and unloaded from the transport vehicle to the destination, which requires handling and loading functions to achieve the transportation requirements. In this process, clamps are needed to lift and transport goods.
[0003] Paper roll is one of the commonly used raw materials in industry, which is columnar structure, heavy, and soft structure, and the paper roll is generally not supported by pallet, but placed directly on the ground. During the loading process of the paper roll, on the one hand, after lifting the paper roll, the existing holding clamp assembly will produce a certain inclination under the action of the gravity of the paper roll, so that the end of the paper roll inclined downward will contact the ground first when the paper roll is lowered, thereby deforming the corners of the paper roll. On the other hand, the existing technology realizes the pitch assembly of the pitch angle, which is generally arranged between the forks and the fork frame, and changes the included angle between the forks and the fork frame through the pitch assembly, which occupies a large space at the rear end of the fork frame. During the rotation of the fork frame, the pitch assembly will touch the surrounding paper roll.
[0004] A rotary lifting clamp is designed to solve the problems of the existing technology. INVENTION CONTENTS
[0005] To solve the problems of the existing technology, the utility model provides a rotary lifting clamp, which can effectively solve at least one of the problems of the existing technology.
[0006] The technical scheme of the utility model is as follows:
[0007] A rotary lifting clamp comprises:
[0008] A lifting assembly is driven to move horizontally by a horizontal moving platform assembly, and the lifting assembly comprises a connecting bracket and left and right lifting brackets arranged oppositely, the lifting brackets are respectively driven by corresponding lifting mechanisms, the top end of one of the lifting brackets is hinged to the connecting bracket, and the top end of the other lifting bracket is fixedly connected to the connecting bracket;
[0009] A rotary assembly is hinged to the bottom end of the two lifting brackets, and is lifted by the lifting assembly;
[0010] A holding clamp assembly is arranged in the rotary assembly, and is driven by the rotary assembly to realize the rotary motion of the holding clamp assembly.
[0011] Furthermore, the lifting bracket includes a fixed linear slide rail, a middle linear slide rail, and a lifting linear slide rail. The top end of the fixed linear slide rail is fixedly connected to or hinged to the connecting bracket. The fixed linear slide rail is connected to the middle linear slide rail. The housing of the lifting mechanism is fixedly mounted on the connecting bracket. The piston rod of the lifting mechanism drives the middle linear slide rail to rise and fall. The top end of the lifting linear slide rail is provided with a sprocket. A chain is wound around the sprocket. One end of the chain is connected to the bottom end of the lifting linear slide rail, and the other end of the chain is connected to the fixed linear slide rail. The bottom end of the lifting linear slide rail is connected to the rotating assembly.
[0012] Furthermore, one of the lifting brackets has a rotating column at its top, and the connecting bracket has a mounting groove that matches the rotating column. The rotating column is installed in the mounting groove. When the lifting amounts of the two lifting brackets are different, the lifting bracket with the rotating column swings around the rotating column to adapt to the change in distance between the bottom ends of the two lifting brackets.
[0013] Furthermore, a number of distance sensors are provided at the top of the rotating assembly. The distance sensors rotate with the rotating assembly. The distance between a pair of distance sensors is the same as the diameter of the corresponding paper roll and is located on the center line of the corresponding paper roll when the clamping assembly clamps the paper roll.
[0014] Furthermore, at least one distance sensor is disposed on the top edge of the rotating assembly and on the center line of the corresponding paper roll when the clamping assembly clamps the paper roll.
[0015] Furthermore, the clamp assembly includes a clamp base, a fixed arm, and a movable arm. The fixed arm is fixedly connected to the clamp base, and one end of the movable arm is hinged to the clamp base. The inner surfaces of the fixed arm and the movable arm are arc-shaped, and the length of the movable arm is greater than the length of the fixed arm. The movable arm is driven to open and close by a drive component.
[0016] Furthermore, the clamp base is equipped with a rotating disk, and the movable arm and fixed arm are mounted on the rotating disk. The rotating disk is equipped with a gear ring, which is driven by a rotating motor to drive the movable arm and fixed arm to rotate together in the horizontal direction.
[0017] Furthermore, it includes a weighing sensor for obtaining the weight of the paper roll held by the clamping assembly.
[0018] Therefore, this utility model provides the following effects and / or advantages:
[0019] This application uses a lifting assembly to drive a rotating assembly, and sets the two lifting brackets of the lifting assembly to be driven separately, so as to achieve pitch angle control of the rotating assembly through different driving amounts.
[0020] The top of one of the lifting brackets in this application is hinged, thereby adapting to shape changes caused by different lifting amounts of the two lifting brackets, ensuring that the structure and function of this application can be realized.
[0021] This application is equipped with a distance sensor. By determining the location of the distance sensor and the distance between them, it is possible to detect whether the clamping assembly is aligned with the paper roll, thereby accurately clamping the paper roll and preventing the clamping assembly from damaging the paper roll.
[0022] The clamp assembly provided in this application has the function of horizontal rotation, thereby adapting the paper rolls at different loading positions to the direction of the fixed arm and movable arm of the clamp assembly, so that the paper rolls can be normally withdrawn from the clamp assembly after being lowered without damaging the paper rolls.
[0023] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.
[0024] It should be understood that the above summary and the following detailed description of the present invention are exemplary and explanatory, and are intended to provide further explanation of the present invention as claimed. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of the structure of this application.
[0026] Figure 2 for Figure 1 A magnified view of part A.
[0027] Figure 3 This is a structural schematic diagram of the lifting assembly.
[0028] Figure 4 This is a schematic diagram showing the location of the distance sensor.
[0029] Figure 5 This is a schematic diagram of the clamp assembly.
[0030] Figure 6 This is a schematic diagram of the rotating disk.
[0031] Figure 7 This is a diagram showing the paper rolls being placed on a freight truck.
[0032] Figure 8 This is a schematic diagram of the working state of the existing clamp assembly.
[0033] Figure 9 This is a schematic diagram of the working state of the clamp assembly of this application.
[0034] Figure 10 This is a schematic diagram of the working state of the clamp assembly when it is not rotating laterally.
[0035] Figure 11 This is a schematic diagram of the working state of the clamp assembly after its lateral rotation. Detailed Implementation
[0036] To facilitate understanding by those skilled in the art, the structure of this utility model will now be described in further detail with reference to the accompanying drawings:
[0037] Example 1
[0038] refer to Figures 1-6 A rotary lifting clamp, comprising:
[0039] The lifting assembly 3 is driven to move laterally by the lateral platform assembly. The lifting assembly 3 includes a connecting bracket 31 and lifting brackets 32 arranged opposite to each other on the left and right. The lifting brackets 32 are driven by corresponding lifting mechanisms 33. The top end of one of the lifting brackets 32 is hinged to the connecting bracket 31, and the top end of the other lifting bracket 32 is fixedly connected to the connecting bracket 31.
[0040] The top end of the rotating assembly 4 is hinged to the bottom end of the two lifting brackets 32, and the lifting assembly 3 performs the lifting action.
[0041] The clamp assembly 5 is disposed on the rotary assembly 4, and the rotation of the clamp assembly 5 is achieved by the rotary assembly 4.
[0042] The structure and connection method of the lifting assembly 3 and the rotating assembly 4 are one of the core improvements of this application. In the prior art, the rotating assembly 4 is generally connected to the transverse platform assembly, and then the rotating assembly 4 drives the lifting assembly 3 to rotate, which in turn drives the forks and other structures to lift. This application improves this by connecting the lifting assembly 3 to the transverse platform assembly, and the left and right opposing lifting brackets 32 included in the lifting assembly 3 can be driven by separate lifting mechanisms 33. That is, the lifting amounts of the two lifting brackets 32 can be different, thereby achieving a tilted state where one side of the rotating assembly 4 is higher than the other.
[0043] Furthermore, when the lifting amounts of the two lifting brackets 32 are different, the bottom ends of the lifting brackets 32 will be uneven, resulting in a change in the distance between the bottom ends of the two lifting brackets 32. Specifically, the distance between the bottom ends of the two lifting brackets 32 will be larger than the distance between the bottom ends when the lifting amounts are the same. To accommodate this change, in this embodiment, the top end of one of the lifting brackets 32 is hinged to the connecting bracket 31, while the top end of the other lifting bracket 32 is fixedly connected to the connecting bracket 31. Thus, when the lifting amounts are different, the lifting bracket 32 whose top end is fixedly connected to the connecting bracket 31 remains vertical, while the lifting bracket 32 whose top end is hinged to the connecting bracket 31 swings outward at a certain angle to adapt to the tilted state of the rotating assembly 4, where one side is higher than the other.
[0044] The lifting mechanism 33 can be an electric cylinder.
[0045] The different lifting amounts of the two lifting brackets 32 simultaneously drive the rotating assembly 4 to achieve the pitching motion of the clamping assembly 5.
[0046] After the paper roll clamp is raised, the paper roll's own weight will cause the clamp assembly 5 to tilt downwards at a certain angle. During the descent of the paper roll, the tilted end will touch the ground first, potentially causing damage or deformation at that location. Therefore, after the paper roll clamp is raised, the pitch angle of the clamp assembly 5 needs to be adjusted to ensure the bottom surface of the paper roll is parallel to the ground. When the opening of the clamp of the clamp assembly 5 faces the rotating assembly 4 and is rotated to the same direction as the two lifting brackets 32, the pitch angle of the clamp assembly 5 can be controlled by varying the driving amount of the lifting brackets 32. This eliminates the need for a pitch angle drive component 54 or similar device at the clamp position of the clamp assembly 5 to drive its pitch, thus avoiding unnecessary components on the side or back of the clamp assembly 5. Furthermore, the clamp assembly 5 will not touch the surrounding paper rolls during rotation.
[0047] Further, the lifting bracket 32 includes a fixed linear slide rail 321, an intermediate linear slide rail 322, and a lifting linear slide rail 323. The top end of the fixed linear slide rail 321 is fixedly connected to or hinged to the connecting bracket 31. The fixed linear slide rail 321 is connected to the intermediate linear slide rail 322. The housing of the lifting mechanism 33 is fixedly mounted on the connecting bracket 31. The piston rod of the lifting mechanism 33 drives the intermediate linear slide rail 322 to rise and fall. The top end of the lifting linear slide rail 323 is provided with a sprocket 324. A chain 325 is wound around the sprocket 324. One end of the chain 325 is connected to the bottom end of the lifting linear slide rail 323, and the other end of the chain 325 is connected to the fixed linear slide rail 321. The bottom end of the lifting linear slide rail 323 is connected to the rotating assembly 4.
[0048] In existing lifting assemblies 3, the lifting linear slide rail 323 is typically directly mounted on a fixed linear slide rail 321, and the lifting linear slide rail 323 is driven by an electric cylinder or hydraulic cylinder to control the lifting assembly 3 to raise or lower. Due to the long length of the paper roll, the existing lifting assembly 3 may not be able to meet the lifting variations required by the clamping assembly 5. Therefore, in this embodiment, the lifting bracket 32 is configured with a fixed linear slide rail 321, an intermediate linear slide rail 322, and a lifting linear slide rail 323. One end of the chain 325 is connected to the bottom of the lifting frame, and the other end is connected to the fixed linear slide rail 321. At the same time, the top of the lifting linear slide rail 323 is provided with a sprocket 324. When the drive cylinder extends downward, the fixed linear slide rail 321 remains stationary, and the middle linear slide rail 322 is driven by the drive cylinder to move downward by N meters. The extension of the chain 325 is 2N meters. Therefore, the lifting linear slide rail 323 drives the clamp assembly 5 to lower by 2N meters, realizing a double speed lifting. This can greatly reduce the overall height of the lifting bracket 32 in the non-lowered state and increase the lowering distance, thereby accommodating taller paper rolls.
[0049] Furthermore, one of the lifting brackets 32 is provided with a rotating column 326 at its top end, and the connecting bracket 31 is provided with a mounting groove that cooperates with the rotating column 326. The rotating column 326 is installed in the mounting groove. When the lifting amounts of the two lifting brackets 32 are different, the lifting bracket 32 with the rotating column 326 swings around the rotating column 326 to adapt to the change in distance between the bottom ends of the two lifting brackets 32.
[0050] This application achieves the ability for the top of one of the lifting brackets 32 to swing through the connection of the rotating column 326, thereby realizing the pitch angle control of the clamp assembly 5, while ensuring that the lifting bracket 32 cannot detach from the connecting bracket 31 and will not deviate.
[0051] Furthermore, a plurality of distance sensors 43 are provided at the top of the rotating assembly 4. The distance sensors 43 rotate with the rotating assembly 4. The distance between a pair of distance sensors 43 is the same as the diameter of the corresponding paper roll and is located on the center line of the corresponding paper roll when the clamping assembly 5 clamps the paper roll.
[0052] Furthermore, at least one of the distance sensors 43 is disposed on the top edge of the rotating assembly 4 and on the center line of the paper roll when the clamping assembly 5 clamps the paper roll.
[0053] In this embodiment, a distance sensor 43, located on the centerline of the paper roll corresponding to the diameter of the paper roll and positioned at the same distance from the paper roll, is used to obtain the distance between the top of the rotating assembly 4 and the paper roll. This is because the transverse platform assembly 2 can drive the clamping assembly 5 closer to the paper roll using vision, radar, or horizontal and vertical coordinates. At this point, the relative position between the clamping assembly 5 and the paper roll is preliminary and requires further precise adjustment. When the clamping assembly 5 approaches the paper roll, the lifting height of the lifting assembly 3 relative to the clamp can be calculated using the lifting amount of the lifting bracket 32. At this time, the height of the top of the rotating assembly 4 from the ground can be calculated. The distance between the pair of distance sensors 43 and the object below them is detected. When either distance sensor 43 detects a distance equal to the distance from the top of the rotating assembly 4 to the top surface of the paper roll, it indicates that the distance sensor 43 is above the paper roll. At this point, the position of the clamping assembly 5 can be finely adjusted forward, backward, left, and right. Since the distance between the pair of distance sensors 43 is the same as the diameter of the corresponding paper roll, when both distance sensors 43 are above the paper roll, it indicates that both distance sensors 43 are above the diameter of the paper roll. Furthermore, since the distance sensor 43 corresponds to the center line of the paper roll when the clamping assembly 5 clamps the paper roll, the paper roll is positioned directly opposite the center of the clamping assembly 5. After clamping, the force applied to both sides of the paper roll is even, better protecting the paper roll and preventing damage from the clamping assembly 5.
[0054] The distance sensor 43 located at the top edge of the rotating assembly 4 can sense the distance between the edge of the rotating assembly 4 and the area below it. This setting can accommodate paper rolls of different sizes. In addition, when the paper roll is lowered, the distance sensor 43 located at the top edge of the rotating assembly 4 will pass the edge of the freight vehicle first during the lateral movement, thereby generating a jump in the distance from the ground to the freight vehicle's cargo compartment. At this time, it can be used to accurately determine the position of the clamp assembly 5 above the freight vehicle.
[0055] Furthermore, the clamp assembly 5 includes a clamp base 51, a fixed arm 52, and a movable arm 53. The fixed arm 52 is fixedly connected to the clamp base 51, and one end of the movable arm 53 is hinged to the clamp base 51. The inner surfaces of the fixed arm 52 and the movable arm 53 are arc-shaped, and the length of the movable arm 53 is greater than the length of the fixed arm 52. The movable arm 53 is driven to open and close by a driving member 54.
[0056] Paper rolls are typically arranged in an array, and when they are conveyed to the loading system by a conveyor belt, the distance between them is relatively large. However, after the paper rolls are loaded onto the freight truck, they need to be arranged compactly, such as... Figure 7 As shown. Then, after the clamp assembly 5 has secured the paper roll onto the freight vehicle, the clamp assembly 5 needs to open and release the paper roll, as shown in the reference.Figure 8 The dotted line in the figure shows the opening path of the clamping arms. In existing technology, both clamping arms can move. Since the clamping arms form a near-circular structure after closing, they need to open when they are close to the paper roll. During the opening process, the clamping arms can easily touch the paper roll and damage it.
[0057] To accommodate the compact arrangement of paper rolls, the clamp assembly 5 in this embodiment is configured with a fixed arm 52 and a movable arm 53, wherein the length of the movable arm 53 is greater than the length of the fixed arm 52. Through this structure, as... Figure 9 As shown in the figure, the dotted line represents the opening path of the movable arm 53. This allows only the movable arm 53 to open and close during the clamping or releasing of the paper roll, while the fixed arm 52 remains stationary. Furthermore, the length of the movable arm 53 is greater than the length of the fixed arm 52. Therefore, when approaching the paper roll, the fixed arm 52 can rotate to face the space between adjacent paper rolls and insert itself into that space. At this time, the movable arm 53 faces the rear of the freight vehicle (where no paper rolls are loaded), thus providing the movable arm 53 with greater operational space. This allows it to avoid adjacent paper rolls, ensuring that the movable arm 53 does not touch surrounding paper rolls during the clamping process.
[0058] Furthermore, the clamp base 51 is provided with a rotating disk 55, the movable arm 53 and the fixed arm 52 are disposed on the rotating disk 55, the rotating disk 55 is provided with a gear ring, the gear ring is driven by a rotating motor 56 to drive the movable arm 53 and the fixed arm 52 to rotate together in the horizontal direction.
[0059] like Figure 10 As shown in the figure, the dotted line represents the movement path of the movable arm 53. When loading the paper roll on the left side of the vehicle, the movable arm 53 will interfere with the paper roll in front of it during its opening process, thereby damaging the paper roll. At this time, the rotation of the rotating assembly 4 cannot make the movable arm 53 avoid the surrounding paper rolls, or the rotating assembly 4 needs to exceed its rotation angle limit to achieve this. Therefore, in this embodiment, a rotating disk 55 is provided on the clamping base 51, which can drive the fixed arm 52 to rotate in the horizontal direction, thereby exchanging the positions of the movable arm 53 and the fixed arm 52, as shown. Figure 11 As shown, by exchanging the positions of the movable arm 53 and the fixed arm 52, the movable arm 53 is moved from a position closer to the front of the freight vehicle to a position closer to the rear of the freight vehicle, so that it will not interfere with the surrounding paper rolls during the opening and closing of the movable arm 53.
[0060] Furthermore, a weighing sensor is included to obtain the weight of the paper rolls held by the five clamps of the clamp assembly.
[0061] In this embodiment, the paper rolls to be loaded may have different specifications, and therefore their weights may also be different. Paper rolls of different weights will cause the pitch angle of the clamp assembly 5 to change differently under its own gravity. In order to accurately adjust the lifting amount of the two lifting brackets 32 and thus adjust the pitch angle change of the clamp assembly 5 on the paper roll, the paper roll can be accurately straightened in the vertical direction after being lifted. Specifically, linear quantification can be performed based on the weight of the paper roll and the change in pitch angle produced by the paper roll on the clamping assembly 5. For example, if the paper roll weighs 3500kg and the change in pitch angle is 2.5°, then the lifting amount of the two lifting brackets 32 needs to be adjusted to a difference of 48mm and the electric cylinder difference is 24mm. When clamping a 1500kg paper roll, it is determined that the lifting amount of the two lifting brackets 32 needs to be adjusted to a difference of 20mm and the electric cylinder difference is 10mm. Alternatively, calibration can be performed based on various paper roll specifications. For example, if the paper roll weighs 3500kg, 1500kg, and 1000kg, and the change in pitch angle is 2.5°, 1°, and 0.5°, then the lifting amount of the two lifting brackets 32 needs to be adjusted to a difference of 48mm, 20mm, and 10mm, respectively. Then, when the next paper roll to be clamped weighs 1500kg, the above historical data can be directly queried to determine that the lifting amount of the two lifting brackets 32 needs to be adjusted to a difference of 20mm and the electric cylinder difference is 10mm.
[0062] It should be noted that any reference signs placed between parentheses in the claims should not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. This invention can be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.
[0063] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.
[0064] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," 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 or an electrical connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0065] 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 should not be construed as necessarily referring 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.
Claims
1. A rotary lifting clamp, characterized in that: include: The lifting assembly (3) is driven to move laterally by the lateral platform assembly. The lifting assembly (3) includes a connecting bracket (31) and lifting brackets (32) arranged opposite to each other on the left and right. The lifting brackets (32) are driven by corresponding lifting mechanisms (33). The top end of one of the lifting brackets (32) is hinged to the connecting bracket (31), and the top end of the other lifting bracket (32) is fixedly connected to the connecting bracket (31). The top of the rotating assembly (4) is hinged to the bottom of the two lifting brackets (32), and the lifting assembly (3) performs lifting and lowering actions. The clamp assembly (5) is disposed on the rotating assembly (4) and the rotation of the clamp assembly (5) is achieved by the rotating assembly (4).
2. The rotary lifting clamp according to claim 1, characterized in that: The lifting bracket (32) includes a fixed linear slide rail (321), an intermediate linear slide rail (322), and a lifting linear slide rail (323). The top end of the fixed linear slide rail (321) is fixedly connected to or hinged to the connecting bracket (31). The fixed linear slide rail (321) is connected to the intermediate linear slide rail (322). The housing of the lifting mechanism (33) is fixedly mounted on the connecting bracket (31). The piston rod of the lifting mechanism (33) drives the intermediate linear slide rail (322) to rise and fall. The top end of the lifting linear slide rail (323) is provided with a sprocket (324). The sprocket (324) is wound with a chain (325). One end of the chain (325) is connected to the bottom end of the lifting linear slide rail (323), and the other end of the chain (325) is connected to the fixed linear slide rail (321). The bottom end of the lifting linear slide rail (323) is connected to the rotating assembly (4).
3. The rotary lifting clamp according to claim 1, characterized in that: One of the lifting brackets (32) has a rotating column (326) at its top. The connecting bracket (31) has a mounting groove that matches the rotating column (326). The rotating column (326) is installed in the mounting groove. When the lifting amounts of the two lifting brackets (32) are different, the lifting bracket (32) with the rotating column (326) swings around the rotating column (326) to adapt to the change in distance between the bottom ends of the two lifting brackets (32).
4. A rotary lifting clamp according to claim 1, characterized in that: The top of the rotating assembly (4) is provided with a plurality of distance sensors (43), which rotate with the rotating assembly (4). The distance sensors (43) are the same as the diameter of the corresponding paper roll and are located on the center line of the corresponding paper roll when the clamping assembly (5) clamps the paper roll.
5. A rotary lifting clamp according to claim 4, characterized in that: At least one of the distance sensors (43) is disposed on the top edge of the rotating assembly (4) and on the center line of the paper roll when the clamping assembly (5) clamps the paper roll.
6. A rotary lifting clamp according to claim 1, characterized in that: The clamp assembly (5) includes a clamp base (51), a fixed arm (52) and a movable arm (53). The fixed arm (52) is fixedly connected to the clamp base (51), and one end of the movable arm (53) is hinged to the clamp base (51). The inner surfaces of the fixed arm (52) and the movable arm (53) are arc-shaped, and the length of the movable arm (53) is greater than the length of the fixed arm (52). The movable arm (53) is driven to open and close by a drive member (54).
7. A rotary lifting clamp according to claim 6, characterized in that: The clamp base (51) is provided with a rotating disk (55), the movable arm (53) and the fixed arm (52) are provided on the rotating disk (55), the rotating disk (55) is provided with a toothed ring, the toothed ring is driven by a rotating motor (56) to drive the movable arm (53) and the fixed arm (52) to rotate together in the horizontal direction.
8. A rotary lifting clamp according to claim 1, characterized in that: Includes a weighing sensor for obtaining the weight of the paper roll held by the clamp assembly (5).