Lithium battery shell laser cutting device

Abstract

The utility model provides a lithium battery shell laser cutting device, which relates to the technical field of laser cutting processing and comprises a laser cutting mechanism arranged on a workbench and used for cutting a pipe body. The laser cutting mechanism comprises a laser cutting head arranged in the vertical direction, a limiting assembly for clamping a pipe body, a control assembly for controlling one end of the pipe body to move to the position below the laser cutting head in the axial direction, and a rotating assembly for driving the pipe body to rotate in the axial direction. When the pipe body is cut, the limiting assembly clamps and fixes the pipe body of the pipe body, the control assembly moves to the opposite end of the pipe body, clamps and fixes the end of the pipe body and controls the pipe body to move to the position below the laser cutting head, the rotating assembly drives the pipe body to rotate in the axial direction of the rotating assembly, and meanwhile the laser cutting head cuts the pipe body. The pipe body can be conveniently and accurately cut, and the machining quality of the lithium battery shell is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of laser cutting processing technology, specifically a laser cutting device for lithium battery casings. Background Technology

[0002] In the field of lithium battery manufacturing, the quality and precision of the lithium battery casing are crucial to the battery's performance and safety. Lithium battery casings typically employ a tubular structure, and to meet the assembly requirements of lithium batteries of different specifications, the tubular structure needs to be precisely cut and machined.

[0003] Traditional pipe cutting methods, such as mechanical cutting and flame cutting, have many drawbacks. During mechanical cutting, the tool is in direct contact with the pipe, generating significant friction and heat, which can easily lead to pipe deformation and uneven cuts, affecting cutting accuracy and quality. Furthermore, mechanical cutting is poorly adaptable to pipes of different materials and thicknesses, and the tool wears out quickly, requiring frequent replacements, increasing production costs and maintenance difficulty. Flame cutting uses a high-temperature flame to melt and cut the pipe; however, this method is slow, and an oxide layer forms at the cut, requiring subsequent grinding. This not only increases the number of steps but may also negatively impact the material properties of the pipe.

[0004] With the development of laser technology, laser cutting has gradually been applied in the field of tube cutting due to its advantages such as high precision, high speed, and non-contact operation. However, existing laser cutting devices for lithium battery casings still have shortcomings in structural design and functional implementation: 1. The clamping and positioning of the tube during the cutting process is not stable enough, causing the tube to shake or shift during cutting, affecting the cutting accuracy; 2. The tube cannot be automatically moved and rotated axially during the cutting process, requiring manual intervention, which reduces cutting efficiency and makes it difficult to ensure the consistency of the cut.

[0005] Therefore, developing a laser cutting device for lithium battery casings that can stably clamp the tube, achieve automatic axial movement and rotation, and has high cutting precision and efficiency is of great practical significance. Utility Model Content

[0006] To address the aforementioned issues, this application provides a laser cutting device for lithium battery casings.

[0007] To achieve the above objectives, this application provides the following technical solution: a laser cutting device for lithium battery casings, comprising a laser cutting mechanism disposed on a worktable for cutting tubes, the laser cutting mechanism comprising a vertically arranged laser cutting head, a limiting component for clamping the tube body, a control component for controlling one end of the tube body to move axially to below the laser cutting head, and a rotating component for driving the tube body to rotate around the axial direction; when cutting the tube body, the limiting component clamps and fixes the tube body, the control component moves to the opposite end of the tube body, clamps and fixes that end, and controls the tube body to move to below the laser cutting head, the rotating component drives the tube body to rotate around its axial direction, and at the same time the laser cutting head cuts the tube body.

[0008] Preferably, the limiting component includes two limiting semi-rings symmetrically arranged about the tube body, a second clamping structure for controlling the two limiting semi-rings to clamp the tube body, and a limiting wheel rotatably arranged on the inner ring of the limiting semi-rings, the axis of the limiting wheel being perpendicular to the axis of the tube body.

[0009] Preferably, the control component includes a first clamping structure located at one end of the tube body and a third adjusting structure for controlling the first clamping structure to move along the axial direction of the tube body. The first clamping structure clamps and fixes the inner tube or tube body at the end of the tube body.

[0010] Preferably, the rotating assembly includes a rotating disk disposed on the first clamping structure facing away from the tube body, and a rotating component disposed on the third adjusting structure. The axis of the rotating disk is arranged along the axis of the tube body; the rotating component controls the rotating disk to rotate around the axis.

[0011] Preferably, the rotating assembly further includes a support ring fitted onto the two limiting half-rings via an inner ring, a rotating ring rotatably disposed in a rotating groove at the end of the support ring, and a connecting block disposed on the rotating ring and connected to the second clamping structure, wherein the axis of the support ring is arranged along the axial direction of the tube body.

[0012] The beneficial effects of this utility model are as follows: The lithium battery casing laser cutting device of this invention uses a limiting component to firmly clamp the tube body, a control component to reliably clamp the end of the tube body and precisely control its movement to below the laser cutting head, and a rotating component to drive the tube body to rotate uniformly around the axis. Combined with the high-energy laser beam of the laser cutting head, it can achieve high-precision circular cutting of the tube body, with a flat cut and accurate dimensions, effectively improving the processing quality of the lithium battery casing and meeting the high-precision requirements of lithium battery assembly. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0014] Figure 1 This is a schematic diagram of the structure of the laser cutting device for lithium battery casing proposed in this utility model.

[0015] Figure 2 This is a schematic diagram of the structure of the laser cutting device for lithium battery casing proposed in this utility model.

[0016] Figure 3 This is a schematic diagram of the limiting component structure of this utility model.

[0017] Figure 4 for Figure 2 Enlarged structural diagram at point A in the middle.

[0018] In the diagram: 1. Worktable; 2A. First adjustment structure; 2B. Second adjustment structure; 2C. Third adjustment structure; 3. Laser cutting head; 4. Rotary motor; 5A. First clamping structure; 5B. Second clamping structure; 6. Tube body; 7. Connecting rod; 8. Limiting half ring; 9. Support ring; 10. Rotating groove; 11. Rotating ring; 12. First gripper; 13. Limiting wheel; 14. Rotating disk; 15. Second gripper. Detailed Implementation

[0019] To make the technical means, creative features, and achieved objectives and effects of this utility model easier to understand, the present utility model is further described below with reference to specific embodiments and accompanying drawings. However, the following embodiments are only preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described in the embodiments without creative effort are all within the protection scope of this utility model.

[0020] Example 1: Reference Figures 1-4 The lithium battery casing laser cutting device shown includes a laser cutting mechanism mounted on a worktable 1 for cutting a tube 6. The laser cutting mechanism includes a vertically arranged laser cutting head 3, a limiting component for clamping the tube 6, a control component for controlling one end of the tube 6 to move axially below the laser cutting head 3, and a rotating component for driving the tube 6 to rotate around its axial direction. When cutting the tube 6, the limiting component clamps and fixes the tube 6, the control component moves to the opposite end of the tube 6, clamps and fixes that end, and controls the tube 6 to move below the laser cutting head 3. The rotating component drives the tube 6 to rotate around its axial direction, while the laser cutting head 3 cuts the tube 6.

[0021] like Figure 1 and Figure 2As shown, the tube 6 to be cut is placed in a suitable working position. At this time, the laser cutting device is in standby mode, and all components are in their initial positions. The limiting component is activated, clamping and fixing the tube 6. Specifically, the clamping parts in the limiting component (such as the limiting semi-ring 8) move close to each other, tightly wrapping the tube 6, ensuring that the tube 6 will not shift in the radial direction, providing stable support for subsequent cutting operations. The stable clamping of the tube 6 by the limiting component, and the precise clamping and positioning of the tube 6 end by the control component, ensure the positional stability of the tube 6 during the cutting process, avoiding cutting errors caused by tube shaking or offset, thereby greatly improving cutting accuracy and meeting the strict requirements of lithium battery shells for dimensional and shape accuracy. The rotating component drives the tube 6 to rotate at a uniform speed, and with the precise control of the laser cutting head 3, the cutting lines are uniform and smooth, and the cut is flat, further improving the cutting quality. The control component starts working and moves to the opposite end of the tube 6. Upon reaching the designated position, the clamping structure of the control component (such as the first clamping structure 5A) clamps and fixes the end of the tube 6. After clamping, the control component controls the tube 6 to move along its axis according to a preset program, gradually bringing the tube 6 closer to the laser cutting head 3 until it reaches the set cutting position below the laser cutting head 3. The control component can automatically control the tube 6 to move axially to the cutting position without manual adjustment of the tube position, reducing manual operation time and errors, and improving the automation and efficiency of cutting. Combined with the rotating component driving the tube 6 to rotate continuously, the laser cutting head 3 can complete a circular cut in one go, which greatly shortens the cutting time and improves production efficiency compared to the traditional multiple cutting or segmented cutting methods. When the tube 6 reaches the cutting position, the rotating component is activated. The rotating component drives the tube 6 to rotate at a constant speed around its own axis through a transmission component (such as the rotating disk 14) connected to the tube 6. At the same time, the laser cutting head 3 emits a high-energy laser beam to cut the tube 6. As the tube body 6 rotates, the laser cutting head 3 can continuously cut along the circumference of the tube body 6, achieving a circular cut. Once the tube body 6 has completed the predetermined cutting length, the laser cutting head 3 stops emitting the laser beam, the rotating component stops driving the tube body 6 to rotate, the control component releases its grip on the end of the tube body 6, and the limiting component also releases its grip on the tube body 6. At this point, the cut tube body 6 is removed from the worktable, and the entire cutting process is complete.

[0022] like Figures 1-4As shown in this embodiment, the control and limiting components in this technical solution have a certain degree of adjustability, which can adapt to the cutting needs of tubes 6 of different specifications and sizes. Whether the tube is small or large diameter, thin-walled or thick-walled, stable clamping and precise cutting can be achieved by adjusting the clamping structure and control parameters. It has strong versatility and adaptability, and can meet the diverse production needs of the lithium battery manufacturing industry. The laser cutting head 3 adopts a non-contact cutting method, avoiding the safety hazards such as sparks and splashes that may occur in traditional cutting methods where the tool directly contacts the tube, thus improving the safety of the cutting process. The stable clamping function of the limiting and control components prevents accidents caused by accidental detachment or movement of the tube 6 during the cutting process, ensuring the personal safety of the operator and the normal operation of the equipment.

[0023] like Figures 1-3 As shown, the limiting assembly includes two limiting semi-rings 8 symmetrically arranged about the tube body 6, a second clamping structure 5B that controls the two limiting semi-rings 8 to clamp the tube body 6, and a limiting wheel 13 rotatably arranged on the inner ring of the limiting semi-rings 8, the axis of the limiting wheel 13 being perpendicular to the axis of the tube body 6.

[0024] In this embodiment, when the tube body 6 is not being cut, the two limiting semi-rings 8 are in a relatively separated state, leaving sufficient space between them to allow the tube body 6 to be placed in a suitable position between the two limiting semi-rings 8. At this time, the second clamping structure 5B is in a state where no clamping force is applied, and the limiting wheel 13 is in a free state, not in contact with the tube body 6 or only in slight contact. The operator places the tube body 6 to be cut between the two limiting semi-rings 8 and adjusts the position of the tube body 6 so that it is approximately in the axial position required for cutting. The second clamping structure 5B is activated, and the second clamping structure 5B begins to work, controlling the two limiting semi-rings 8 to move closer to each other through a transmission mechanism (such as a lead screw and nut mechanism, a cylinder pushing mechanism, etc., depending on the design of the second clamping structure 5B). As the two limiting semi-rings 8 move closer, they gradually wrap around the tube body 6, applying a clamping force to the tube body 6 and tightly clamping the tube body 6 in the middle. Two symmetrically arranged limiting semi-rings 8, under the control of the second clamping structure 5B, can simultaneously apply clamping force from both sides of the tube body 6, firmly clamping the tube body 6 in the middle. This clamping method can effectively prevent the tube body 6 from radially displacing due to the force of the laser cutting head 3 during the cutting process, ensuring the positional stability of the tube body 6 during the cutting process and providing a foundation for high-precision cutting. The design of the limiting semi-rings 8 can be adapted to the shape of the tube body 6, providing good clamping effect for tube bodies 6 of different diameters and shapes, enhancing the versatility of the device. During the clamping process of the limiting semi-rings 8, the limiting wheel 13 gradually comes into contact with the outer surface of the tube body 6. Since the limiting wheel 13 is rotatably mounted on the inner ring of the limiting semi-ring 8, and its axis is perpendicular to the axis of the tube body 6, when the tube body 6 is subjected to clamping force, the limiting wheel 13 will automatically adjust its position according to the shape of the tube body 6, and fit tightly against the surface of the tube body 6. The axis of the limiting wheel 13 is perpendicular to the axis of the tube body 6, and the tube body 6 can move along the axial direction. At this time, the limiting wheel 13 rotates, and the limiting wheel 13 is used to limit the movement of the tube body 6 only along the axial direction. After the tube body 6 is cut, the second clamping structure 5B is closed. The second clamping structure 5B controls the two limiting semi-rings 8 to move away from each other, releasing the clamp on the tube body 6. At this time, the limiting wheel 13 is no longer in contact with the tube body 6, and the operator can remove the cut tube body 6 from the worktable.

[0025] like Figure 1 and Figure 2 As shown, the control assembly includes a first clamping structure 5A located at one end of the tube body 6, and a third adjusting structure 2C that controls the first clamping structure 5A to move along the axial direction of the tube body 6. The first clamping structure 5A clamps and fixes the inner tube or tube body at the end of the tube body 6.

[0026] In this embodiment, after the tube 6 to be cut is placed in the working area, the control component is activated. The third adjustment structure 2C starts working, generating driving force according to a preset program or operation command, preparing to move the first clamping structure 5A. The driving force of the third adjustment structure 2C acts on the first clamping structure 5A, causing the first clamping structure 5A to move towards one end of the tube 6 along the axial direction of the tube 6. During the movement, the position of the first clamping structure 5A is monitored in real time by sensors (such as position sensors, distance sensors, etc., depending on the device design) to ensure that it moves accurately to the appropriate position at the end of the tube 6. When the first clamping structure 5A reaches the end position of the tube 6, the first clamping structure 5A begins to operate, clamping and fixing the inner tube or tube body at the end of the tube 6. The clamping method can be adjusted according to the specifications and material of the tube 6, for example, using different clamping mechanisms such as mechanical grippers or pneumatic clamps, to ensure a firm clamping without damaging the tube 6. This clamping method can be selected according to the actual structure of the tube 6. Whether clamping the inner tube or the tube body, it ensures the stability and reliability of the clamping, providing an accurate positioning basis for subsequent cutting operations. Precise positioning and clamping avoid cutting errors caused by positional deviations during the cutting process, improving cutting accuracy and ensuring the dimensional accuracy and quality of the lithium battery casing. During the cutting process, if it is necessary to adjust the position of the tube 6 along the axial direction according to cutting requirements, the third adjustment structure 2C is activated again, precisely controlling the first clamping structure 5A to move the tube 6 along the axial direction. The distance and speed of movement can be precisely set by the control system to meet different cutting needs. After the tube 6 is cut, the first clamping structure 5A releases its grip on the end of the tube 6. Subsequently, the third adjustment structure 2C controls the first clamping structure 5A to move back to its initial position along the axial direction, awaiting the next clamping and movement operation.

[0027] like Figure 2 and Figure 4 As shown, the rotating assembly includes a rotating disk 14 disposed on the first clamping structure 5A facing away from the tube body 6, and a rotating component disposed on the third adjusting structure 2C. The axis of the rotating disk 14 is arranged along the axis of the tube body 6; the rotating component controls the rotating disk 14 to rotate around the axis.

[0028] In this embodiment, after the first clamping structure 5A completes the clamping and fixing of the end of the tube 6, and the third adjusting structure 2C adjusts the tube 6 to a suitable axial position, the rotating component enters the work preparation stage. The control system issues a command to start the rotating component. The rotating component starts working, generating rotational power, and transmits the power to the rotating disk 14 through a transmission mechanism (such as gear transmission, belt transmission, etc., depending on the device design). Since the rotating disk 14 is connected to the first clamping structure 5A (possibly through direct or indirect connection, such as through a connecting shaft or other components), the rotating disk 14 begins to rotate around its axis (which is arranged along the axial direction of the tube 6) under the drive of the rotating component. The rotation of the rotating disk 14 drives the first clamping structure 5A to rotate together, thereby causing the tube 6 clamped by the first clamping structure 5A to begin rotating at a uniform speed around its own axis. The axis of the rotating disk 14 is arranged along the axial direction of the tube 6, and the rotating component controls the rotating disk 14 to rotate around this axis, which can ensure that the tube 6 rotates stably and at a uniform speed around its own axis. This stable rotation is a key factor in ensuring that the laser cutting head 3 can cut the tube body evenly and accurately, forming a flat and smooth cut, which helps to improve the cutting quality and precision. By precisely controlling the rotation speed and stability of the rotating disk 14, the requirements of different cutting processes for tube body rotation can be met, adapting to the cutting of tube bodies of different specifications and materials.

[0029] In this embodiment, the automated operation of the rotating component allows the tube 6 to rotate automatically and continuously without manual intervention, improving the automation level and efficiency of the cutting process. Simultaneously, stable rotation ensures the uniformity and consistency of the cutting lines, reducing cutting defects and errors, improving cutting quality, and lowering the reject rate. The rotation speed and mode of the rotating component can be adjusted according to different cutting requirements. For example, for tubes requiring fine cutting, the rotation speed can be reduced to improve cutting accuracy; for tubes requiring rapid cutting, the rotation speed can be increased to improve production efficiency. This adjustability allows the device to adapt to the cutting needs of tubes of different shapes, sizes, and materials, exhibiting strong versatility and adaptability.

[0030] In this embodiment, the rotating component is a rotary motor 4, which drives the rotating disk 14 to rotate around the axis.

[0031] like Figures 1-3 As shown, the rotating assembly also includes a support ring 9 that is sleeved on the two limiting half-rings 8 through an inner ring, a rotating ring 11 that is rotatably disposed in a rotating groove 10 at the end of the support ring 9, and a connecting block disposed on the rotating ring 11 and connected to the second clamping structure 5B. The axis of the support ring 9 is arranged along the axis of the tube body 6.

[0032] In this embodiment, when the device is not performing a cutting operation, the support ring 9 is fitted onto the two limiting half-rings 8 through the inner ring, and is in a relatively static and fixed position. The rotating ring 11 is disposed in the rotating groove 10 at the end of the support ring 9, and can rotate freely within the rotating groove 10, but is not actively rotated by external force. The connecting block is connected to the second clamping structure 5B. At this time, the connecting block and the second clamping structure 5B are also in a static state, and the limiting half-rings 8 are in a separated state without clamping the tube body 6. During the clamping of the tube body 6 by the limiting half-rings 8 and the subsequent cutting process, the support ring 9 can withstand a certain force to prevent the limiting half-rings 8 from deforming or displacing, ensuring that the clamping of the tube body 6 by the limiting half-rings 8 is stable and reliable, providing a foundation for high-precision cutting. The rotating ring 11 is rotatably disposed in the rotating groove 10 at the end of the support ring 9 and is connected to the second clamping structure 5B through the connecting block. When the rotating ring 11 rotates, it transmits the rotational power to the limiting half-ring 8 through the connecting block and the second clamping structure 5B, thereby driving the tube body 6, which is clamped by the limiting half-ring 8, to rotate around the axis. This rotational transmission method is simple and reliable, ensuring the smoothness and synchronicity of the tube body 6's rotation. After the tube body 6 is placed in the appropriate position, the second clamping structure 5B is activated, and it begins to move, preparing to clamp the tube body 6. Since the connecting block is connected to the second clamping structure 5B, it will drive the connecting block to generate a certain force transmission during the operation of the second clamping structure 5B. During the process of the second clamping structure 5B controlling the two limiting half-rings 8 to move closer to each other to clamp the tube body 6, the support ring 9 is always sleeved on the limiting half-ring 8, providing support for the limiting half-ring 8 and ensuring that the limiting half-ring 8 maintains a stable relative position and structural stability during the clamping process. When the rotating component needs to drive the tube body 6 to rotate, the rotating ring 11 begins to rotate within the rotating groove 10. Since the connecting block is connected to the second clamping structure 5B, and the second clamping structure 5B is connected to the limiting half ring 8, the rotation of the rotating ring 11 is transmitted to the limiting half ring 8 through the connecting block and the second clamping structure 5B, thereby driving the tube body 6 clamped by the limiting half ring 8 to rotate around the axis.

[0033] like Figure 1 and Figure 2 As shown, in this embodiment, the laser cutting head 3 is mounted on the worktable 1 via a first adjustment structure 2A and a second adjustment structure 2B. The first adjustment structure 2A is used to control the movement of the laser cutting head 3 in the vertical direction, and the second adjustment structure 2B is used to control the movement of the laser cutting head 3 along the length of the tube body 6.

[0034] In this embodiment, the first adjustment structure 2A, the second adjustment structure 2B, and the third adjustment structure 2C are adjusted by a lead screw. The lead screw is driven by a motor to rotate, and the rotation of the lead screw drives the lead screw block on the lead screw to move, thereby realizing the movement of the lead screw block along the length of the lead screw.

[0035] like Figures 1-4 As shown, in this embodiment, both the first clamping structure 5A and the second clamping structure 5B use pneumatic fingers. The two first grippers 12 of the first clamping structure 5A are connected to different limiting half-rings 8 through different connecting rods 7. By controlling the two first grippers 12 to move closer or further away from each other, the two limiting half-rings 8 can be driven to move closer or further away from each other. When the two second grippers 15 of the second clamping structure 5B fix the end of the tube body 6, they are fixed in two ways. In the first way, when the two second grippers 15 are inserted into the inner tube of the end of the tube body 6, the two second grippers 15 are controlled to move away from each other, so that the two second grippers 15 are clamped and held in the inner tube of the tube body 6, and the position of the tube body 6 is fixed. In the second way, when the two second grippers 15 are initially far apart from each other and symmetrical about the end of the tube body 6, the two second grippers 15 are controlled to move closer to each other, so as to clamp and fix the end of the tube body 6.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A laser cutting device for lithium battery casings, comprising a laser cutting mechanism disposed on a worktable (1) for cutting a tube (6), characterized in that, The laser cutting mechanism includes a laser cutting head (3) arranged vertically, a limiting component for clamping the tube body (6), a control component for controlling one end of the tube body (6) to move axially to below the laser cutting head (3), and a rotating component for driving the tube body (6) to rotate around the axial direction. When cutting the tube (6), the limiting component clamps and fixes the tube body (6), the control component moves to the opposite end of the tube (6), clamps and fixes that end, and controls the tube (6) to move below the laser cutting head (3). The rotating component drives the tube (6) to rotate around its axis, while the laser cutting head (3) cuts the tube (6).

2. The lithium battery casing laser cutting device according to claim 1, characterized in that: The limiting assembly includes two limiting semi-rings (8) symmetrically arranged about the tube body (6), a second clamping structure (5B) that controls the two limiting semi-rings (8) to clamp the tube body (6), and a limiting wheel (13) rotatably arranged on the inner ring of the limiting semi-rings (8), the axis of the limiting wheel (13) being perpendicular to the axis of the tube body (6).

3. The lithium battery casing laser cutting device according to claim 1 or 2, characterized in that: The control assembly includes a first clamping structure (5A) located at one end of the tube body (6) and a third adjusting structure (2C) for controlling the first clamping structure (5A) to move along the axial direction of the tube body (6). The first clamping structure (5A) clamps and fixes the inner tube or tube body at the end of the tube body (6).

4. The lithium battery casing laser cutting device according to claim 3, characterized in that: The rotating assembly includes a rotating disk (14) located on the first clamping structure (5A) facing away from the tube body (6) and a rotating component located on the third adjusting structure (2C). The axis of the rotating disk (14) is arranged along the axis of the tube body (6). The rotating component controls the rotating disk (14) to rotate around the axis.

5. The lithium battery casing laser cutting device according to claim 4, characterized in that: The rotating assembly also includes a support ring (9) fitted on the two limiting half rings (8) via an inner ring, a rotating ring (11) rotatably disposed in a rotating groove (10) at the end of the support ring (9), and a connecting block disposed on the rotating ring (11) and connected to the second clamping structure (5B). The axis of the support ring (9) is arranged along the axis of the tube body (6).

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