A chuck for a CNC laser tube cutting machine

Abstract

This invention provides a chuck for a CNC laser tube cutting machine, belonging to the technical field of tube cutting machine components. It includes a chuck body, a slider, a clamping arm, and a clamping roller. A detection roller parallel to the clamping roller is provided on one side along the tube feeding direction, and an air bladder is sleeved on the outer side of the detection roller. An air supply unit for inflating / absorbing the air bladder is provided on the clamping arm, allowing the air bladder to inflate. By providing a detection roller with an air bladder on one side of the clamping roller, when the clamping roller contacts and clamps the tube, the inflated air bladder is compressed by the tube, allowing the air bladder to wrap around the outer wall of the tube, forming a wrapping area and increasing the contact area. Simultaneously, the clamping pressure applied to the tube by air pressure reduces the clamping pressure exerted by the clamping roller on the tube, preventing deformation of thin-walled tubes when clamped.

Description

Technical Field

[0001] This invention belongs to the technical field of pipe cutting machine components, specifically referring to a clamping chuck for a CNC laser pipe cutting machine. Background Technology

[0002] The pipe clamping device (chuck) of a pipe cutting machine is the core component of the pipe cutting machine. It is mainly used to clamp and fix the pipe to ensure cutting accuracy and stability. With the development of automated cutting technology, the design of the pipe clamping device (chuck) has been continuously optimized to adapt to high efficiency, high precision and diversified processing needs.

[0003] Currently, in order to achieve multi-dimensional cutting, the pipe clamping device (chuck) of the pipe cutting machine clamps the pipe with a clamping arm equipped with a rotating roller, so that the pipe can move axially while being clamped. However, when the rotating roller is used to clamp the pipe, the contact area between the rotating roller and the pipe is small, and correspondingly, the pressure per unit area is large. When clamping thin-walled pipes, the pipe is prone to deformation. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a clamping chuck for a CNC laser tube cutting machine, which at least partially solves the above problems.

[0005] The technical solution adopted by this invention is as follows: This invention proposes a clamping chuck for a CNC laser tube cutting machine, comprising:

[0006] The chuck body has four circumferentially evenly distributed slide grooves, each slide groove contains a slider, which is driven by a drive unit inside the chuck body to slide along the slide groove;

[0007] Four clamping arms are respectively connected to the four sliders, and each clamping arm is rotatably connected to a clamping roller;

[0008] The clamping roller has a detection roller parallel to it on one side along the tube feeding direction. An air bladder is sleeved on the outside of the detection roller. The clamping arm is provided with an air supply unit for inflating / absorbing air into the air bladder, so that the air bladder can be inflated.

[0009] When the airbag is fully inflated, the outer diameter of the airbag is larger than the diameter of the clamping roller, so that the airbag can form an enclosing area with the pipe.

[0010] Furthermore, when the airbag is fully contracted, the outer diameter of the airbag is smaller than the diameter of the clamping roller, and the minimum allowable diameter of the clamping roller is the same as the outer diameter of the airbag when it is fully contracted.

[0011] Furthermore, it also includes a detection circuit, the detection roller is configured as a conductive metal roller, the inner wall of the airbag is coated with a conductive coating, and the detection roller and the conductive coating are connected to the detection circuit;

[0012] The detection circuit is activated when the conductive coating comes into contact with the detection roller.

[0013] Furthermore, the detection circuit is equipped with a power supply and an alarm unit for alarm purposes.

[0014] Furthermore, the first end of the detection roller is provided with a connecting shaft, and the first end of the detection roller is connected to the clamping arm through the connecting shaft.

[0015] Furthermore, a conductive slip ring is provided on the connecting shaft, and the detection roller and the conductive coating are connected to the detection circuit through the conductive slip ring.

[0016] Furthermore, the detection roller is configured as a tubular structure, and the detection roller is provided with a plurality of air holes communicating with its interior. The second end of the detection roller is also provided with a shaft tube communicating with its interior. The second end of the detection roller is rotatably connected to the clamping arm through the shaft tube, and the shaft tube is connected to the air supply unit, so that the air supply unit can supply air to the interior of the detection roller and deliver it evenly to the air bag through the air holes.

[0017] Furthermore, the air supply unit includes a piston cylinder and a piston that slides inside it. One side of the piston cylinder is provided with an electric push rod for driving the piston to move. One end of the piston cylinder is connected to the shaft tube through a connecting air pipe.

[0018] Furthermore, a mechanical seal is provided at the connection between the connecting air pipe and the shaft tube, and the connecting air pipe is connected to the shaft tube through the mechanical seal.

[0019] Furthermore, a connecting plate is provided between the telescopic end of the electric push rod and the piston, and the telescopic end of the electric push rod and the piston are connected through the connecting plate.

[0020] The beneficial effects achieved by the present invention using the above structure are as follows:

[0021] 1. By setting a detection roller with an air bladder on one side of the clamping roller, when the clamping roller contacts the pipe for clamping, the inflated air bladder is compressed by the pipe, and the air bladder can wrap around the outer wall of the pipe to form a wrapping area, increasing the contact area; at the same time, the air pressure is used to apply clamping pressure to the pipe, which reduces the clamping pressure applied by the clamping roller to the pipe, and avoids pipe deformation when clamping thin-walled pipes.

[0022] 2. A conductive coating is provided on the inside of the airbag, and a detection circuit is set up. The detection roller and the conductive coating are connected to the detection circuit. If the diameter of the clamping roller is worn to the minimum value, the inflated airbag is still restricted by the tube and in contact with the detection roller. At this time, the conductive coating on the inside of the airbag contacts the detection roller, and the detection circuit is connected. It can be determined that the clamping roller has been worn to the minimum diameter, which plays the role of monitoring the wear of the clamping roller. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a clamping chuck for a CNC laser tube cutting machine according to an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the clamping arm and air supply unit in the clamping chuck of a CNC laser tube cutting machine according to an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram illustrating the state of the air bladder in the clamping chuck of a CNC laser tube cutting machine when it is fully contracted, according to an embodiment of the present invention.

[0026] Figure 4 This is a schematic diagram illustrating the state in which an air bladder in the clamping chuck of a CNC laser tube cutting machine expands and contacts the tube to form a wrapping area, according to an embodiment of the present invention.

[0027] Figure 5 This is a schematic diagram illustrating the state in which the airbag in the clamping chuck of a CNC laser tube cutting machine expands and is restricted by the tube to contact the detection roller, according to an embodiment of the present invention.

[0028] Figure 6 This is a schematic diagram of the structure of the detection roller in the clamping chuck of a CNC laser tube cutting machine according to an embodiment of the present invention;

[0029] Figure 7 This is a schematic diagram of the deployment structure of the airbag in the clamping chuck of a CNC laser tube cutting machine according to an embodiment of the present invention;

[0030] Figure 8 This is a schematic diagram of the detection circuit in the clamping chuck of a CNC laser tube cutting machine according to an embodiment of the present invention.

[0031] The components include: 1. Chuck body; 101. Slide groove; 11. Slider; 2. Clamping arm; 21. Clamping roller; 22. Detection roller; 221. Shaft tube; 222. Connecting shaft; 23. Airbag; 231. Conductive coating; 201. Air hole; 3. Piston cylinder; 31. Piston; 32. Electric push rod; 33. Connecting air pipe; 34. Mechanical seal; 301. Connecting plate; 4. Conductive slip ring; 5. Power supply; 6. Alarm unit.

[0032] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0034] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0035] like Figure 1 As shown, the present invention proposes a chuck for a CNC laser tube cutting machine, including a chuck body 1, a slider 11, and a clamping arm 2.

[0036] The chuck body 1 has four circumferentially evenly distributed slide grooves 101. There are four sliders 11, which are respectively connected in the four slide grooves 101. The chuck body 1 has a drive unit inside. The drive unit includes four output ends. The four output ends of the drive unit drive the four sliders 11 to slide along the slide grooves 101 respectively.

[0037] There are four clamping arms 2, which are respectively connected to four sliders 11, and each of the four clamping arms 2 is rotatably connected to a clamping roller 21.

[0038] It should be noted that the four clamping arms 2 are divided into two groups, with two symmetrical clamping arms 2 forming one group. The two groups of clamping arms 2 are mounted on the slider 11 at different heights, that is, the two groups of clamping arms 2 are staggered along the axial direction of the clamped pipe. When the two groups of clamping arms 2 move towards the center of the chuck body 1 to clamp the pipe, a smaller clamping range can be obtained.

[0039] Thus, driven by the drive unit inside the chuck body 1, the four clamping arms 2 can slide radially along the chuck body 1. When the clamping arms 2 move toward the center of the chuck body 1, they can clamp the pipe. When the chuck body 1 moves away from the center of the chuck body 1, they can release the pipe.

[0040] Combination Figure 2 and Figure 4As shown, the clamping roller 21 has a detection roller 22 parallel to it on one side along the tube feeding direction. An air bladder 23 is sleeved on the outside of the detection roller 22. The clamping arm 2 is provided with an air supply unit for inflating / inhaling the air bladder 23. The air supply unit is used to inflate the air bladder 23 so that the air bladder 23 can expand.

[0041] When the airbag 23 is fully inflated, its outer diameter is larger than that of the clamping roller 21. Because the airbag 23 has good elastic deformation capability, when the clamping roller 21 contacts the pipe for clamping, the airbag 23 is compressed by the pipe, and it can wrap around the outer wall of the pipe, forming a wrapping area (e.g., ...). Figure 4 As shown, the contact area is increased, and at the same time, the air pressure is used to apply clamping pressure to the pipe. Correspondingly, the clamping pressure applied to the pipe by the clamping roller 21 can be reduced, so as to avoid the pipe deformation when clamping thin-walled pipes.

[0042] Thus, when clamping the pipe, the four clamping arms 2 move towards the center of the chuck body 1, the clamping rollers 21 contact the pipe and clamp it, and then the air supply unit inflates the air bladder 23, causing it to fully expand. The outer diameter of the fully expanded air bladder 23 is larger than the diameter of the clamping rollers 21; therefore, the air bladder 23 can wrap around the outer wall of the pipe, forming a wrapping area on the pipe surface (e.g., ...). Figure 4 As shown, the contact area with the pipe is increased, and at the same time, the clamping pressure is applied to the pipe by air pressure. Correspondingly, the clamping pressure applied to the pipe by the clamping roller 21 can be reduced, so as to avoid the pipe from deforming when clamping thin-walled pipes.

[0043] It should be noted that the two ends of the airbag 23 are fixed to the detection roller 22, and the detection roller 22 is rotatably connected to the clamping arm 2. Therefore, when the airbag 23 contacts and wraps the tube, even if the tube moves axially, the airbag 23 and the detection roller 22 can be dragged and rotated synchronously, so that the airbag 23 and the tube have rolling friction, avoiding sliding friction that causes greater wear.

[0044] Combination Figure 3 As shown, when the airbag 23 is fully contracted, the outer diameter of the airbag 23 is smaller than the diameter of the clamping roller 21, and the minimum allowable diameter of the clamping roller 21 is the same as the outer diameter of the airbag 23 when it is fully contracted.

[0045] When the airbag 23 is fully contracted, the inner wall of the airbag 23 contacts the detection roller 22 (e.g., Figure 3 (As shown).

[0046] As the equipment is used, the clamping roller 21 will wear out. Therefore, the minimum allowable diameter of the clamping roller 21 is the minimum usable diameter for the clamping roller 21 to wear out. When the diameter of the clamping roller 21 is smaller than this diameter, it needs to be replaced.

[0047] Combination Figure 7 and Figure 8 As shown, the present invention also includes a detection circuit. The detection roller 22 is configured as a conductive metal roller. The inner wall of the airbag 23 is coated with a conductive coating 231. The detection roller 22 and the conductive coating 231 are connected to the detection circuit. When the conductive coating 231 and the detection roller 22 come into contact, the detection circuit is connected.

[0048] Therefore, as the clamping roller 21 wears, its diameter decreases. When the diameter of the clamping roller 21 wears down to the minimum allowable diameter, as the clamping roller 21 moves to clamp the tube, the tube simultaneously comes into contact with the clamping roller 21 and the fully contracted airbag 23. As the airbag 23 fully inflates, it remains confined by the tube and contacts the detection roller 22 (e.g., ...). Figure 5 As shown in the figure, at this time, the conductive coating 231 on the inner side of the airbag 23 contacts the detection roller 22, the detection circuit is connected, and it can be determined that the clamping roller 21 has been worn to the minimum diameter.

[0049] In a specific embodiment, the detection circuit is equipped with a power supply 5 for power supply and an alarm unit 6 for alarm. The power supply 5 supplies power to the entire detection circuit, and the alarm unit 6 can issue an alarm when the detection circuit is connected to remind the operator.

[0050] In an optional embodiment, the alarm unit 6 is an audible and visual alarm and is installed on the pipe cutting machine.

[0051] Thus, when the clamping roller 21 moves to clamp the tube, if the diameter of the clamping roller 21 wears to its minimum value, the tube simultaneously contacts the clamping roller 21 and the fully retracted airbag 23. As the airbag 23 fully inflates, it remains constrained by the tube and contacts the detection roller 22 (e.g., Figure 5 As shown), at this time, the conductive coating 231 on the inner side of the airbag 23 contacts the detection roller 22, the detection circuit is connected, and it can be determined that the clamping roller 21 has been worn to the minimum diameter. The alarm unit 6 issues an alarm to remind the operator to replace the clamping roller 21.

[0052] Combination Figure 6 As shown, the first end of the detection roller 22 is provided with a connecting shaft 222. The first end of the detection roller 22 is connected to the clamping arm 2 through the connecting shaft 222. A conductive slip ring 4 is provided on the connecting shaft 222. The detection roller 22 and the conductive coating 231 are connected to the detection circuit through the conductive slip ring 4. While the clamping roller 21 and the airbag 23 are rotating, the connection between the clamping roller 21, the conductive coating 231 and the detection circuit is maintained.

[0053] In a specific embodiment, both the clamping roller 21 and the conductive coating 231 are provided with conductive leads. One end of the conductive lead is connected to the terminal of the conductive slip ring 4, and the wires of the detection circuit are connected to the corresponding terminal of the conductive slip ring 4, so that the clamping roller 21, the conductive coating 231 and the detection circuit are electrically connected.

[0054] Combination Figure 6 As shown, the detection roller 22 is configured as a tubular structure. The detection roller 22 is provided with multiple air holes 201 communicating with its interior. The second end of the detection roller 22 is also provided with a shaft tube 221 communicating with its interior. The second end of the detection roller 22 is rotatably connected to the clamping arm 2 through the shaft tube 221, and the shaft tube 221 is connected to the air supply unit, so that the air supply unit supplies air to the interior of the detection roller 22 through the shaft tube 221, and then the air is evenly delivered to the airbag 23 through the multiple air holes 201, causing the airbag 23 to inflate.

[0055] Combination Figure 2 As shown, the air supply unit includes a piston cylinder 3 and a piston 31 that slides inside it. An electric push rod 32 for driving the piston 31 is provided on one side of the piston cylinder 3. One end of the piston cylinder 3 is connected to the shaft tube 221 through a connecting air pipe 33. The piston 31 is pushed to move inside the piston cylinder 3 by the electric push rod 32.

[0056] When the piston 31 is pushed toward one end of the connecting air pipe 33, the air inside the piston cylinder 3 is transported to the inside of the detection roller 22 through the connecting air pipe 33, and is evenly transported to the air bag 23 through multiple air holes 201, causing the air bag 23 to inflate. When the piston 31 is pushed toward the end away from the connecting air pipe 33, the air inside the air bag 23 can be drawn back into the piston cylinder 3 through the connecting air pipe 33, causing the air bag 23 to contract.

[0057] Thus, when clamping the pipe, the electric push rod 32 pushes the piston 31 to move towards one end of the connecting air pipe 33. The air inside the piston cylinder 3 is transported to the inside of the detection roller 22 through the connecting air pipe 33 and the shaft tube 221, and is evenly transported to the air bag 23 through multiple air holes 201, causing the air bag 23 to expand and apply a clamping force to the pipe. When the pipe is not clamped or when the pipe is fed over a long distance without cutting, the electric push rod 32 pushes the piston 31 away from the connecting air pipe 33. The air inside the air bag 23 can be drawn back into the piston cylinder 3 through the connecting air pipe 33, causing the air bag 23 to contract. At this time, the air bag 23 does not contact the pipe, avoiding excessive wear of the air bag 23 caused by long-distance transport of the pipe.

[0058] In a specific embodiment, a mechanical seal 34 is provided at the connection between the connecting air pipe 33 and the shaft tube 221. The connecting air pipe 33 is connected to the shaft tube 221 through the mechanical seal 34, so that the detection roller 22 can still maintain airtightness when rotating, ensuring the continuity of gas delivery.

[0059] In an optional embodiment, a connecting plate 301 is provided between the telescopic end of the electric push rod 32 and the piston 31, and the telescopic end of the electric push rod 32 and the piston 31 are connected through the connecting plate 301.

[0060] The working principle of this invention is as follows: Driven by the drive unit inside the chuck body 1, the four clamping arms 2 move towards the center of the chuck body 1 to clamp the pipe. Then, the piston 31 is pushed by the electric push rod 32 to move towards one end of the connecting air pipe 33. The air inside the piston cylinder 3 is transported to the inside of the detection roller 22 through the connecting air pipe 33 and the shaft pipe 221, and is evenly transported into the air bladder 23 through multiple air holes 201, causing the air bladder 23 to fully inflate. The outer diameter of the fully inflated air bladder 23 is larger than the diameter of the clamping roller 21. Therefore, the air bladder 23 can wrap around the outer wall of the pipe, forming a wrapping area on the surface of the pipe (e.g., ...). Figure 4 As shown), the contact area with the pipe is increased, and at the same time, air pressure is used to apply clamping pressure to the pipe;

[0061] When the diameter of the clamping roller 21 wears down to the minimum permissible diameter, as the clamping roller 21 moves to clamp the tube, the tube simultaneously comes into contact with the clamping roller 21 and the fully retracted air bladder 23. As the air bladder 23 inflates fully, it remains confined by the tube and contacts the detection roller 22 (e.g., ...). Figure 5 As shown), at this time, the conductive coating 231 on the inner side of the airbag 23 contacts the detection roller 22, the detection circuit is connected, and it can be determined that the clamping roller 21 has been worn to the minimum diameter. The alarm unit 6 issues an alarm to remind the operator to replace the clamping roller 21.

[0062] When the pipe is not clamped or the pipe is fed over a long distance without cutting, the electric push rod 32 pushes the piston 31 to the end away from the connecting air pipe 33. The air inside the airbag 23 can be drawn back into the piston cylinder 3 through the connecting air pipe 33, causing the airbag 23 to contract. At this time, the airbag 23 does not contact the pipe, avoiding excessive wear of the airbag 23 caused by long-distance pipe transportation.

[0063] In summary, by providing a detection roller 22 with an airbag 23 sleeved on one side of the clamping roller 21, when the clamping roller 21 contacts and clamps the pipe, the inflated airbag 23 is compressed by the pipe, and the airbag 23 can wrap around the outer wall of the pipe, forming a wrapping area (e.g., Figure 4 As shown, the contact area is increased, and at the same time, the air pressure is used to apply clamping pressure to the pipe. Correspondingly, the clamping pressure applied to the pipe by the clamping roller 21 can be reduced, so as to avoid the pipe deformation when clamping thin-walled pipes.

[0064] A conductive coating 231 is provided on the inner side of the airbag 23, and a detection circuit is provided. The detection roller 22 and the conductive coating 231 are connected to the detection circuit. If the diameter of the clamping roller 21 is worn to its minimum value, the inflated airbag 23 is still restricted by the tube and in contact with the detection roller 22 (e.g., Figure 5 As shown in the figure, at this time, the conductive coating 231 on the inner side of the airbag 23 contacts the detection roller 22, the detection circuit is connected, and it can be determined that the clamping roller 21 has been worn to the minimum diameter. The alarm unit 6 issues an alarm to remind the operator to replace the clamping roller 21, which plays the role of monitoring the wear of the clamping roller 21.

[0065] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0066] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A clamping chuck for a CNC laser tube cutting machine, characterized in that, include: The chuck body (1) has four circumferentially evenly distributed slide grooves (101) on it. Each slide groove (101) is provided with a slider (11) and is driven by a drive unit inside the chuck body (1) to slide along the slide groove (101). Four clamping arms (2) are respectively connected to four sliders (11), and each clamping arm (2) is rotatably connected to a clamping roller (21). Among them, the clamping roller (21) is provided with a detection roller (22) parallel to it on one side along the tube feeding direction, and an air bag (23) is sleeved on the outer side of the detection roller (22). The clamping arm (2) is provided with an air supply unit for inflating / absorbing air into the air bag (23), so that the air bag (23) can be inflated. When the airbag (23) is fully inflated, the outer diameter of the airbag (23) is larger than the diameter of the clamping roller (21), so that the airbag (23) can form a wrapping area with the pipe; It also includes a detection circuit, the detection roller (22) is configured as a conductive metal roller, the inner wall of the airbag (23) is coated with a conductive coating (231), and the detection roller (22) and the conductive coating (231) are connected to the detection circuit; When the conductive coating (231) and the detection roller (22) come into contact, the detection circuit is connected; The first end of the detection roller (22) is provided with a connecting shaft (222), and the first end of the detection roller (22) is connected to the clamping arm (2) through the connecting shaft (222); The connecting shaft (222) is provided with a conductive slip ring (4), and the detection roller (22) and the conductive coating (231) are connected to the detection circuit through the conductive slip ring (4).

2. The clamping chuck of the CNC laser tube cutting machine according to claim 1, characterized in that: When the airbag (23) is fully contracted, the outer diameter of the airbag (23) is smaller than the diameter of the clamping roller (21), and the minimum allowable diameter of the clamping roller (21) is the same as the outer diameter of the airbag (23) when it is fully contracted.

3. The clamping chuck of the CNC laser tube cutting machine according to claim 1, characterized in that: The detection circuit is equipped with a power supply (5) for power supply and an alarm unit (6) for alarm.

4. The clamping chuck of the CNC laser tube cutting machine according to claim 1, characterized in that: The detection roller (22) is configured as a tubular structure. The detection roller (22) is provided with a plurality of air holes (201) communicating with its interior. The second end of the detection roller (22) is also provided with a shaft tube (221) communicating with its interior. The second end of the detection roller (22) is rotatably connected to the clamping arm (2) through the shaft tube (221), and the shaft tube (221) is connected to the air supply unit, so that the air supply unit can supply air to the inside of the detection roller (22) and deliver it evenly to the air bag (23) through the air holes (201).

5. The clamping chuck of the CNC laser tube cutting machine according to claim 4, characterized in that: The air supply unit includes a piston cylinder (3) and a piston (31) that slides inside it. An electric push rod (32) for driving the piston (31) is provided on one side of the piston cylinder (3). One end of the piston cylinder (3) is connected to the shaft tube (221) through a connecting air pipe (33).

6. The clamping chuck of the CNC laser tube cutting machine according to claim 5, characterized in that: A mechanical seal (34) is provided at the connection between the connecting air pipe (33) and the shaft tube (221), and the connecting air pipe (33) is connected to the shaft tube (221) through the mechanical seal (34).

7. The clamping chuck of the CNC laser tube cutting machine according to claim 5, characterized in that: A connecting plate (301) is provided between the telescopic end of the electric push rod (32) and the piston (31), and the telescopic end of the electric push rod (32) and the piston (31) are connected through the connecting plate (301).

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