Clamping jaw, pipe clamping mechanism and cutting device

Abstract

The utility model provides a clamping jaw, a pipe clamping mechanism and cutting equipment, the clamping jaw comprises a mounting base, the mounting base comprises a main base body and two or more mounting layer parts, the two or more mounting layer parts are sequentially arranged on the main base body in the first direction, and a gap is formed between every two adjacent mounting layer parts; the number of the roller sets is in one-to-one correspondence with the number of the mounting layer parts, each roller set comprises two rollers rotationally arranged on the mounting layer parts, and the rotating axes of the two rollers intersect and are perpendicular to the first direction. According to the clamping jaw disclosed by the embodiment of the invention, an ultrathin pipe can be prevented from being shrunken and deformed.

Description

Technical Field

[0001] This application belongs to the technical field of laser processing, and more specifically, relates to a chuck and a pipe clamping mechanism. Background Art

[0002] When laser cutting pipes, generally the laser head does not move axially relative to the pipe. The pipe needs to be clamped by the chuck jaws of the chuck and at the same time achieve axial movement relative to the laser head and rotation relative to the laser head to realize the purpose of continuous processing and feeding.

[0003] When laser cutting pipes, there will be some very thin pipes. The strength of the pipe itself is weak. When clamped by conventional clamping jaws, the clamping force is too large, which will cause the thin pipe to be pinched or deformed when clamped, resulting in the failure of the pipe product. Utility Model Content

[0004] The embodiment of this application provides a chuck with good pipe forming quality.

[0005] The technical solution adopted in the embodiment of this application is: to provide a chuck, including:

[0006] A mounting seat, the mounting seat includes a main seat body and two or more mounting layer parts. The plurality of mounting layer parts are sequentially arranged on the main seat body in a first direction, and there is a gap between adjacent two mounting layer parts;

[0007] A roller group, the number of the roller groups corresponds to the number of the mounting layer parts one by one. The roller group includes two rollers rotatably arranged on the mounting layer part. The rotation axes of the two rollers intersect, and the first direction is perpendicular to the plane formed by the intersection of the rotation axes of the two rollers.

[0008] Further, the roller group further includes a rotating shaft corresponding to each roller. The two ends of the rotating shaft are fixedly connected to the mounting layer part, and the roller is rotatably sleeved on the rotating shaft.

[0009] Further, the mounting layer part includes fixing parts located at both ends of the rotating shaft. The two ends of the rotating shaft are provided with cutting planes. The fixing parts are provided with shaft holes for inserting the ends of the rotating shaft, and the fixing parts are provided with fastening holes for inserting fasteners and abutting against the cutting planes corresponding to the cutting planes.

[0010] Further, the roller group further includes gaskets arranged at both ends of the rotating shaft. The gaskets are located between the mounting layer part and the ends of the rollers.

[0011] Further, a symmetry plane is defined. The two rollers in the roller group are symmetrically arranged with respect to the symmetry plane, and the symmetry plane passes through the intersection point of the rotation axes of the two rollers.

[0012] Further, the diameter of the drum is equal to the thickness of the mounting layer portion in the first direction.

[0013] Further, the mounting seat is further provided with avoidance portions corresponding to and communicating with the intervals one by one.

[0014] Further, in the first direction, the width of the interval is greater than the thickness of the mounting layer portion and the diameter of the drum.

[0015] The embodiment of the present application further provides a pipe clamping mechanism, including a turntable and the claw as described above. There are a plurality of the claws, and the main seat bodies of the claws are arranged on the turntable at equal intervals around the axis of the turntable. The claws can approach or move away from the axis of the turntable on the turntable. The first direction is parallel to the axis of the turntable, and two adjacent claws are staggered along the axis of the turntable, so that the drum of one claw can be inserted into the interval of another claw.

[0016] The embodiment of the present application further provides a cutting device, including the pipe clamping mechanism as described above.

[0017] The embodiment of the present application further provides a pipe clamping mechanism, including the claw as described above.

[0018] The beneficial effects of the claw provided by the embodiment of the present application are as follows: In the claw of the embodiment of the present application, two or more mounting layer portions are sequentially arranged on the main seat body in the first direction, and there is a certain interval between two adjacent mounting layer portions. This interval provides space for the installation and operation of the drum group. Each drum group includes two drums, and the rotation axes of the two drums intersect and are perpendicular to the first direction. This design enables both drums to contact the circumferential surface of the pipe. In the claw of the embodiment of the present application, two or more mounting layer portions (for example, N mounting layer portions, where N≥2) are provided, and two drums are arranged on each mounting layer portion, with a total of 2N drums to clamp the pipe. Through this design, the clamping force of the claw on the pipe is dispersed to 2N drums, greatly reducing the pressure when clamping thin-walled pipes, avoiding the problems of the claw clamping ultra-thin pipes and causing them to be pinched or deformed, and making the pipe forming quality good. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1Schematic three-dimensional structure diagram of the jaw provided by the embodiment of the present application;

[0021] Figure 2 Top view of the jaw provided by the embodiment of the present application;

[0022] Figure 3 Schematic three-dimensional structure diagram of the rotating shaft provided by the embodiment of the present application;

[0023] Figure 4 Schematic three-dimensional structure diagram of the pipe clamping mechanism provided by the embodiment of the present application;

[0024] Figure 5 is Figure 4 Enlarged view of part A in

[0025] Figure 6 Schematic layout diagram of four jaws on the turntable provided by the embodiment of the present application;

[0026] Figure 7 Schematic diagram of the drum of one jaw inserted into the interval of another jaw provided by the embodiment of the present application.

[0027] Among them, the reference numerals in the figure:

[0028] 10. Pipe clamping mechanism;

[0029] 11. Jaw; 111. Mounting seat; 1111. Main seat body; 11111. Avoidance part; 1112. Mounting layer part; 11121. Fixing part; 11122. Shaft hole; 11123. Fastening hole; 1113. Interval; 112. Drum group; 1121. Drum; 1122. Rotating shaft; 11221. Cutting plane; 1123. Gasket; 113. Symmetry plane; P. First direction;

[0030] 12. Turntable;

[0031] 20. Pipe. Detailed implementation manners

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0034] It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0035] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0036] Please refer to Figure 1 , and now the jaw 11 provided by the embodiment of the present application will be described. It should be noted that the jaws 11 are usually used in pairs during actual use.

[0037] Referring to Figure 1 , the jaw 11 of the embodiment of the present application includes a mounting base 111 and a roller group 112.

[0038] The mounting base 111 includes a main base body 1111 and two or more mounting layer parts 1112. The plurality of mounting layer parts 1112 are sequentially arranged on the main base body 1111 along the first direction P, and there is a gap 1113 between two adjacent mounting layer parts 1112.

[0039] The mounting base 111 includes a main base body 1111 and two or more mounting layer parts 1112. The main base body 1111 is similar to a rectangular parallelepiped-shaped base, which provides a stable support structure for the entire jaw 11. The main base body 1111 can be a block structure made of a strong metal material, and its function is similar to a platform, carrying other components. The main base body 1111 can be connected to the turntable 12 to move on the turntable 12. Specifically, holes for connecting to the turntable 12 can be provided on the mounting base 111.

[0040] There are multiple mounting layer parts 1112, such as 2, 3, 4 or more. Two or more mounting layer parts 1112 are sequentially arranged along the first direction P. The first direction P can be a horizontal direction, specifically the axial direction of the pipe 20. There is a gap 1113 between two adjacent mounting layer parts 1112. On the one hand, it leaves space for the convenience of installation and rotation of the roller 1121. On the other hand, when multiple jaws are adjacent and installed, they can be staggered with this gap 1113 to avoid collision between two adjacent jaws.

[0041] Reference Figure 1 and Figure 2 The number of the roller groups 112 corresponds one-to-one to the number of the mounting layer parts 1112. The roller group 112 includes two rollers 1121 rotatably arranged on the mounting layer part 1112. The rotation axes of the two rollers 1121 intersect, and the first direction P is perpendicular to the plane formed by the intersection of the rotation axes of the two rollers 1121.

[0042] The number of the roller groups 112 corresponds one-to-one to the number of the mounting layer parts 1112. Taking the number of the mounting layer parts 1112 as N (N≥2) as an example, the number of the roller groups 112 is N. Each roller group 112 includes two rollers 1121, so the number of the rollers 1121 is 2N. The two rollers 1121 are rotatably arranged on the corresponding mounting layer parts 1112, and their rotation axes 1122 intersect and are perpendicular to the first direction P. This means that when viewed from the side, the axes of the two rollers 1121 will intersect to form a plane, and this plane is perpendicular to the first direction P. Such a design enables both of the two rollers 1121 to contact the circumferential surface of the pipe 20, so as to better clamp the pipe 20.

[0043] Reference Figure 2 As shown in, the projection of the mounting seat 111 on the plane perpendicular to the first direction P is generally Y-shaped. The two branches at the upper end are the mounting layer parts 1112, and two rollers 1121 are respectively mounted at both ends. The lower end is the main seat body 1111, which is connected to the turntable 12 of the cutting device.

[0044] For the thin-walled pipe 20, the traditional clamping method may cause problems such as the pipe 20 being pinched and deformed due to the concentrated clamping force.

[0045] In the claw 11 of the embodiment of the present application, two or more mounting layer parts 1112 are provided (for example, assuming there are N mounting layer parts 1112, where N≥2, and here N is assumed to be 2). Two rollers 1121 are provided on each mounting layer part 1112, so there are a total of 2N rollers 1121 (that is, 2×2 = 4 rollers 1121) to clamp the pipe 20. Through this design, the clamping force of the claw 11 on the pipe 20 is dispersed to 2N rollers 1121, greatly reducing the pressure when clamping the thin-walled pipe 20 and avoiding the occurrence of the above problems. The claw 11 of the embodiment of the present application distributes the clamping force more evenly through the synergistic action of multiple rollers 1121.

[0046] Reference Figure 1 and Figure 3, the drum set 112 further includes a rotating shaft 1122 corresponding to each drum 1121 one by one. Both ends of the rotating shaft 1122 are fixedly connected to the installation layer portion 1112, and the drum 1121 is rotatably sleeved on the rotating shaft 1122.

[0047] The drum 1121 is rotatably sleeved on the rotating shaft 1122, enabling the drum 1121 to freely rotate around the rotating shaft 1122. This design allows the drum 1121 to rotate as the pipe 20 moves when clamping the pipe 20, reducing friction and making the clamping process smoother.

[0048] Both ends of the rotating shaft 1122 can be firmly fixed to the installation layer portion 1112 by welding to ensure that the rotating shaft 1122 does not loosen or displace during operation. Bolt connection can also be used, which is more convenient when the rotating shaft 1122 needs to be replaced or repaired.

[0049] Refer to Figure 1 , the installation layer portion 1112 includes fixing portions 11121 located at both ends of the rotating shaft 1122. Both ends of the rotating shaft 1122 are provided with cutting planes 11221. The fixing portions 11121 are provided with shaft holes 11122 for the ends of the rotating shaft 1122 to be inserted into, and the fixing portions 11121 are provided with fastening holes 11123 corresponding to the cutting planes 11221 for fasteners to be inserted and abutted against the cutting planes 11221.

[0050] Both ends of the rotating shaft 1122 are provided with cutting planes 11221. This cutting plane 11221 can be imagined as a planar area formed by cutting at both ends of the cylindrical rotating shaft 1122. For example, the cutting plane 11221 can be a relatively regular rectangular plane.

[0051] The fixing portions 11121 are provided with shaft holes 11122 for the ends of the rotating shaft 1122 to be inserted into. The size and shape of the shaft holes 11122 match the ends of the rotating shaft 1122, enabling the rotating shaft 1122 to be smoothly inserted therein. After the end of the rotating shaft 1122 is inserted into the shaft hole 11122, the fixing portions 11121 are provided with fastening holes 11123 corresponding to the cutting planes 11221 for fasteners to be inserted and abutted against the cutting planes 11221. The fastener can be a bolt. When the screw is inserted into the fastening hole 11123, its end will tightly abut against the cutting plane 11221 of the rotating shaft 1122. The purpose of this is to fix the rotating shaft 1122 and prevent the rotating shaft 1122 from shifting during operation. Because when the jaws 11 clamp the pipe 20, various forces from the pipe 20 will act on it. If the rotating shaft 1122 is not firmly fixed, it may rotate or displace, thus affecting the clamping effect.

[0052] Meanwhile, after the cutting plane 11221 is set, a shoulder will appear on one side of the cutting plane 11221. This shoulder can abut against the fastener, thereby further preventing the rotation shaft 1122 from moving axially. The shoulder is like a retaining edge protruding on one side of the cutting plane 11221, and it can play a role in limiting the rotation shaft 1122 in the axial direction. When the fastener abuts against the cutting plane 11221, the shoulder will also contact the fastener to jointly prevent the rotation shaft 1122 from moving in the axial direction, ensuring the stability and reliability of the rotation shaft 1122 during operation, ensuring that the clamping jaw 11 can normally clamp the pipe 20, and preventing the rotation shaft 1122 from loosening or moving axially during long-term use.

[0053] A screw hole is also provided at the end of the rotation shaft 1122. When it is necessary to disassemble the rotation shaft 1122, a screw can be inserted into the screw hole, and then the rotation shaft 1122 can be pulled out from the shaft hole 11122.

[0054] Refer to Figure 1 and Figure 2 As shown in FIGS. and, the roller group 112 further includes gaskets 1123 provided at both ends of the rotation shaft 1122, and the gaskets 1123 are located between the installation layer portion 1112 and the ends of the rollers 1121. During the operation of the clamping jaw 11, the rollers 1121 will rotate continuously, and certain friction will be generated between the rollers 1121 and the installation layer portion 1112. The presence of the gaskets 1123 can play a buffering role between the two, reducing the direct contact between the rollers 1121 and the installation layer portion 1112, thereby reducing the degree of wear. For example, when the rollers 1121 rotate, the gaskets 1123 can bear a part of the frictional force, protecting the surfaces of the installation layer portion 1112 and the rollers 1121 from excessive wear. Since the gaskets 1123 will gradually wear during operation, but their replacement is relatively easy. When it is found that the gaskets 1123 are severely worn, they can be disassembled and new gaskets 1123 can be replaced without the need for large-scale maintenance of the entire clamping jaw 11 or replacement of other components.

[0055] Refer to Figure 1 and Figure 2 As shown in FIGS. and, a symmetry plane 113 is defined. The two rollers 1121 in the roller group 112 are symmetrically arranged with respect to the symmetry plane 113, and the symmetry plane 113 passes through the intersection point of the rotation axis lines 1122 of the two rollers 1121. The two rollers 1121 are symmetrical in position and shape on the installation layer portion 1112.

[0056] The symmetry plane 113 also passes through the intersection point of the rotation axis lines 1122 of the two rollers 1121, which ensures that when the two rollers 1121 rotate, the relative positional relationship of their axes is symmetric, so that the force on the clamped pipe 20 is more uniform. It can be understood that the axes of the two rollers 1121 form an angle with the symmetry plane 113, and this angle can be set differently in different jaws, and this angle can be selected according to the size of the pipe 20. When the diameter of the pipe 20 is relatively large, this angle can be appropriately increased so that the two rollers 1121 can better contact and clamp the pipe 20; when the diameter of the pipe 20 is relatively small, the angle can be reduced to ensure the stability of clamping.

[0057] Refer to Figure 1 and Figure 7 , the diameter of the roller 1121 is equal to the thickness of the installation layer part 1112 along the first direction P. In practical applications, there may be a situation where multiple jaws 11 work together. For example, when clamping a relatively long pipe 20, it may be necessary to use multiple jaws 11 at different positions to ensure the stability of clamping. When the roller 1121 and the installation layer part 1112 of one jaw 11 need to be inserted into the interval 1113 of another jaw 11, if the diameter of the roller 1121 and the thickness of the installation layer part 1112 are not equal, it may collide or interfere with the components of another jaw 11 during the insertion process, thus affecting the normal operation of the jaw 11. By making the diameter of the roller 1121 equal to the thickness of the installation layer part 1112, it can be ensured that the insertion process proceeds smoothly and there will be no mutual interference between the jaws 11 due to size mismatch. This can improve the efficiency and reliability of the cooperation of multiple jaws 11 and reduce failures and damages caused by interference.

[0058] Refer to Figure 1 and Figure 5 , the mounting seat 111 is further provided with avoidance parts 11111 that communicate with the intervals 1113 one by one. Like the interval 1113, the avoidance parts 11111 also play an avoidance role. The setting of the avoidance parts 11111 is to better adapt to the situation where multiple jaws 11 work together. By providing additional avoidance space, it ensures that the components between different jaws 11 can be inserted and operated smoothly, thereby improving the working efficiency and reliability of the entire jaw 11 system. The avoidance parts 11111 provide additional space, enabling the components of other jaws 11 to have sufficient space for placement during insertion, thus avoiding interference.

[0059] Refer to Figure 5, in the first direction P, the width of the gap 1113 is greater than the thickness of the mounting layer portion 1112 and the diameter of the roller 1121. When multiple jaws 11 work together, the mounting layer portion 1112 and the roller 1121 of one jaw 11 need to be inserted into the gap 1113 of another jaw 11. If the width of the gap 1113 is insufficient, it will cause difficulties in insertion and may even damage the components of the jaw 11. By setting the width of the gap 1113 to be greater than the thickness of the mounting layer portion 1112 and the diameter of the roller 1121, the insertion process can be ensured to proceed smoothly without interference or jamming.

[0060] Referring to Figures 4 to 7 , an embodiment of the present application further provides a pipe clamping mechanism 10, including a turntable 12 and the jaws 11 as described above. A plurality of jaws 11 are provided, and the main seat bodies 1111 of the jaws 11 are arranged on the turntable 12 at equal intervals around the axis of the turntable 12. The jaws 11 can approach or move away from the axis of the turntable 12 on the turntable 12. The first direction P is parallel to the axis of the turntable 12, and two adjacent jaws 11 are staggered along the axis of the turntable 12 so that the roller 1121 of one jaw 11 can be caught in the gap 1113 of another jaw 11.

[0061] Referring to Figure 4 , the turntable 12 is one of the basic components of the entire pipe clamping mechanism 10. It is usually a circular platform that can rotate around its own axis. The function of the turntable 12 is to carry a plurality of jaws 11 and provide support and guidance for the movement of the jaws 11.

[0062] The jaws 11 are as described above, including a mounting seat 111, a roller group 112, etc. A plurality of jaws 11 are provided to achieve stable clamping of the pipe 20. The main seat bodies 1111 of the jaws 11 are arranged on the turntable 12 at equal intervals around the axis of the turntable 12, which means that the plurality of jaws 11 are evenly distributed on the turntable 12, and the distance between two adjacent jaws 11 is equal. This equal-spacing arrangement can ensure that when clamping the pipe 20, the clamping force received by the pipe 20 is more uniform, improving the stability and reliability of clamping.

[0063] Referring to Figure 4 , the jaws 11 can approach or move away from the axis of the turntable 12 on the turntable 12, so that the jaws 11 can be adjusted according to the diameter of the pipe 20 to adapt to the clamping requirements of pipes 20 of different sizes. When clamping a pipe 20 with a smaller diameter, the jaws 11 can approach the axis of the turntable 12 to reduce the clamping radius; when clamping a pipe 20 with a larger diameter, the jaws 11 can move away from the axis of the turntable 12 to increase the clamping radius.

[0064] The first direction P is parallel to the axis of the turntable 12, such that the arrangement directions of the mounting layer portion 1112 of the jaw 11 and the roller 1121 are adapted to the rotation direction of the turntable 12, facilitating better performance when clamping the pipe 20.

[0065] Referring to Figure 5 and Figure 7 , two adjacent jaws 11 are offset along the axis of the turntable 12, so that the roller 1121 of one jaw 11 can be inserted into the gap 1113 of another jaw 11. The advantage of this design is that the number of jaws 11 can be increased without increasing the diameter of the turntable 12, improving the clamping ability of the pipe clamping mechanism 10. At the same time, the layout between the jaws 11 can also be made more compact, reducing space occupation.

[0066] For example, assume there are four jaws 11, which are evenly distributed at 90° intervals on the turntable 12, located above, below, to the left, and to the right of the pipe 20 respectively. When it is necessary to clamp a pipe 20 with a larger diameter, the four jaws 11 can simultaneously move away from the axis of the turntable 12 to increase the clamping radius. At this time, since the adjacent jaws 11 are offset along the axis, for example, the upper and lower jaws 11 are opposite to each other vertically, and the left and right jaws 11 are opposite to each other horizontally. The left jaw 11 is offset from both the upper and lower jaws 11, and the right jaw 11 is also offset from both the upper and lower jaws 11. Then the roller 1121 of the left jaw 11 can be smoothly inserted into the gaps 1113 of the upper and lower jaws 11, and the same applies to the right side. Thus, stable clamping of the pipe 20 is achieved. When it is necessary to clamp a pipe 20 with a smaller diameter, the four jaws 11 can simultaneously move closer to the axis of the turntable 12 to reduce the clamping radius to adapt to the size change of the pipe 20.

[0067] Since the pipe clamping mechanism 10 of the embodiment of the present application includes the jaw 11 in any of the above embodiments, it has the beneficial effects brought by the jaw 11 in any of the above embodiments, which will not be elaborated here.

[0068] The embodiment of the present application also provides a cutting device, including the pipe clamping mechanism 10 as described above.

[0069] Since the cutting device of the embodiment of the present application includes the pipe clamping mechanism 10 in any of the above embodiments, it has the beneficial effects brought by the pipe clamping mechanism 10 in any of the above embodiments, which will not be elaborated here.

[0070] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A jaw, characterized in that, Comprising: A mounting base, the mounting base includes a main base body and two or more mounting layer parts, and a plurality of the mounting layer parts are sequentially arranged on the main base body in a first direction, and there is a gap between two adjacent mounting layer parts; A roller group, the number of the roller groups corresponds one-to-one to the number of the mounting layer parts, the roller group includes two rollers rotatably arranged on the mounting layer part, and the rotation axes of the two rollers intersect, and the first direction is perpendicular to the plane formed by the intersection of the rotation axes of the two rollers.

2. The jaw according to claim 1, wherein The roller group further includes a rotating shaft corresponding to each roller, and two ends of the rotating shaft are fixedly connected to the mounting layer part, and the roller is rotatably sleeved on the rotating shaft.

3. The jaw according to claim 2, wherein, The mounting layer part includes fixing parts located at both ends of the rotating shaft, the two ends of the rotating shaft are provided with cutting planes, the fixing parts are provided with shaft holes for inserting the ends of the rotating shaft, and the fixing parts are provided with fastening holes corresponding to the cutting planes for inserting fasteners and abutting against the cutting planes.

4. The jaw according to claim 2, characterized in that, The roller group further includes gaskets arranged at both ends of the rotating shaft, and the gaskets are located between the mounting layer part and the ends of the rollers.

5. The jaw according to claim 1, wherein Define a symmetry plane, the two rollers in the roller group are symmetrically arranged with respect to the symmetry plane, and the symmetry plane passes through the intersection point of the rotation axes of the two rollers.

6. The jaw according to claim 1, wherein, The diameter of the roller is equal to the thickness of the mounting layer part in the first direction.

7. The jaw according to claim 1, characterized in that, The mounting base is further provided with avoidance parts corresponding to and communicating with the gaps one by one.

8. The jaw according to any one of claims 1 to 7, characterized in that, In the first direction, the width of the gap is greater than the thickness of the mounting layer part and the diameter of the roller.

9. A pipe clamping mechanism, characterized in that, Comprising a turntable and the claw as claimed in claim 8, there are a plurality of the claws, the main base bodies of the claws are arranged on the turntable at equal intervals around the axis of the turntable, the claws can approach or move away from the axis of the turntable on the turntable, the first direction is parallel to the axis of the turntable, and two adjacent claws are staggered along the axis of the turntable, so that the roller of one claw can be inserted into the gap of another claw.

10. A cutting device, characterized in that, Comprising the pipe clamping mechanism as claimed in claim 9.

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