Chuck for machining device and machining device

Abstract

The invention discloses a chuck (1) for a machining device, comprising: a rotatable base (2); the driving unit (3) is mounted on the base (2); the clamping jaw unit (4) is movably mounted on the base (2) and is suitable for grabbing a machined workpiece; and a centering transmission unit (5) comprising: a centering portion configured to be driven by the drive unit (3) to rotate about a rotation axis (L) of the base (2); and the connecting rod part is respectively hinged with the centering part and the clamping claw unit (4) and is used for transmitting the rotary motion of the centering part to the clamping claw unit (4) to carry out grabbing motion. According to some exemplary embodiments, the centering precision of the chuck can be improved, meanwhile, the clamping force can be easily adjusted according to the size of a workpiece, workpiece deformation is avoided, and machining quality can be improved. The invention further discloses a corresponding machining device.

Description

Technical Field

[0001] The present invention relates to the technical field of machining equipment, and in particular to a chuck used for a machining device and a corresponding machining device. Background Art

[0002] Processing devices for processing workpieces such as pipes usually use chucks to clamp and position the workpiece and drive the workpiece to rotate. In order to ensure processing accuracy, there are usually high requirements for the centering accuracy of such chucks. In addition, depending on the size and material of the workpiece, there will be different requirements for the clamping force applied by the chuck. For example, for some small-sized, thin-walled or low-strength materials, a relatively small clamping force is required to avoid the problem of clamping deformation.

[0003] The prior art has proposed various chucks with gear centering mechanisms, in which the clamping position and clamping force of the jaws are changed by driving the corresponding gear mechanism. However, this type of chuck has the following disadvantages: the transmission chain of the gear centering mechanism is often long and complicated, so in addition to the large transmission resistance, its own centering accuracy is also easily affected by multiple factors such as the number of required gears or racks, the accuracy of the layout position, the firmness of the installation, and their own dimensional accuracy. Therefore, it is actually difficult to effectively ensure the centering accuracy of the chuck through the gear centering mechanism; moreover, machining debris can easily enter between the teeth, causing the gear mechanism to fail to operate normally or further deteriorating the centering accuracy and clamping performance.

[0004] In the prior art, a chuck with a centering plate is also known, which can drive the clamping claws to clamp and release through the arc groove on the rotating centering plate. However, due to its own processing accuracy and structural strength, this centering plate with a groove is not conducive to adjusting the clamping force, or the adjustable range of the clamping force is very limited and the adjustment efficiency is low, and the centering plate is easily damaged during the adjustment process.

[0005] In addition, there are other possible problems in reality. Therefore, it is necessary to improve the existing chuck for processing device to improve the corresponding processing technology. Summary of the invention

[0006] Therefore, the object of the present invention is to provide an improved chuck for a machining device and a corresponding machining device.

[0007] According to a first aspect of the present invention, there is provided a chuck for a processing device, comprising: a rotatable base; a drive unit mounted on the base; a jaw unit movably mounted on the base and suitable for gripping a workpiece to be processed; and a centering transmission unit, comprising: a centering portion configured to be driven by the drive unit to rotate around a rotation axis of the base; and a connecting rod portion respectively hinged to the centering portion and the jaw unit to transmit the rotational movement of the centering portion to the jaw unit for gripping movement.

[0008] According to an optional embodiment of the present invention, the claw unit includes a plurality of claw assemblies, the connecting rod part includes a plurality of connecting rods corresponding to the plurality of claw assemblies, a first end of each connecting rod is hinged to the centering part and a second end opposite to the first end is hinged to the corresponding claw assembly.

[0009] According to an optional embodiment of the present invention, a plurality of guide rail structures extending along a radial direction perpendicular to the rotation axis are arranged on the base corresponding to the plurality of claw assemblies, and the claw assemblies are respectively suitable for being driven by the corresponding connecting rods to perform the gripping movement along the corresponding guide rail structures.

[0010] According to an optional embodiment of the present invention, each of the connecting rods is formed as an integral connecting rod.

[0011] According to an optional embodiment of the present invention, on a plane perpendicular to the rotation axis, when the claw assembly is located at the first end claw position at the far end of the guide rail structure away from the rotation axis, a first angle is formed between the connecting rod hinged to the claw assembly and the corresponding guide rail structure, and when the claw assembly is located at the second end claw position at the proximal end of the guide rail structure close to the rotation axis, a second angle is formed between the connecting rod hinged to the claw assembly and the corresponding guide rail structure, the first angle is smaller than the second angle, and the angle formed between the connecting rod and the corresponding guide rail structure gradually increases as the position of the claw assembly changes from the first end claw position toward the second end claw position.

[0012] According to an optional embodiment of the present invention, the centering portion includes at least one centering plate, and the centering plate is mounted on the base so as to be coaxially rotatable with the base.

[0013] According to an optional embodiment of the present invention, the base includes a first surface and a second surface opposite to the first surface, the driving unit and the centering transmission unit are installed on the first surface, and the claw unit is installed on the second surface.

[0014] According to an optional embodiment of the present invention, the base has a central shaft coaxial with the rotation axis and formed to protrude from the first surface, and the centering plate is installed on the periphery of the central shaft and is suitable for rotating around the central shaft.

[0015] According to an optional embodiment of the present invention, the guide rail structure includes a guide groove penetrating the base in the direction of the rotation axis and a guide track arranged on the second surface.

[0016] According to an optional embodiment of the present invention, the centering plate has: an annular main body portion; a plurality of connecting rod hinges protruding radially outward from the main body portion at a plurality of positions equally spaced circumferentially around the rotation axis; and at least one driving hinge protruding radially outward from the main body portion at a position different from the plurality of connecting rod hinges.

[0017] According to an optional embodiment of the present invention, each of the claw assemblies includes a claw, a claw seat, a claw arm fixedly connecting the claw and the claw seat, and a drive shaft fixedly mounted on the claw seat, the claw seat cooperates with the guide rail and can slide along the guide rail, and the drive shaft is hinged to the connecting rod part at the first surface via the guide groove.

[0018] According to an optional embodiment of the present invention, the jaw unit includes at least one group of jaw assemblies corresponding to the at least one centering plate, each group of jaw assemblies includes a plurality of jaw assemblies arranged at equal intervals in the circumferential direction around the rotation axis, and the plurality of jaw assemblies of each group of jaw assemblies are respectively connected to the corresponding centering plate via the corresponding connecting rod transmission of the connecting rod part.

[0019] According to an optional embodiment of the present invention, the centering portion includes a centering plate, and the jaw unit includes a group of jaw assemblies, and the group of jaw assemblies includes two or more jaw assemblies.

[0020] According to an optional embodiment of the present invention, the centering portion includes two centering plates installed in a stacked manner along the rotation axis direction, and the jaw unit includes two groups of jaw assemblies, each group of jaw assemblies includes two or more jaw assemblies.

[0021] According to an optional embodiment of the present invention, the centering portion includes three centering plates installed in a stacked manner along the rotation axis direction, and the jaw unit includes three groups of jaw assemblies, each group of jaw assemblies includes two or more jaw assemblies.

[0022] According to an optional embodiment of the present invention, all the multiple jaw assemblies of the jaw unit are arranged at equal intervals around the circumference.

[0023] According to an optional embodiment of the present invention, the drive unit includes a plurality of pneumatic drive devices arranged at a plurality of equally spaced positions in the circumferential direction around the rotation axis, each of the pneumatic drive devices being pivotally mounted on the base at one end serving as a mounting end and being hinged to the centering part at the other end serving as an output end.

[0024] According to an optional embodiment of the present invention, the pneumatic drive device is a cylinder.

[0025] According to an optional embodiment of the present invention, each centering plate of the centering part is hinged to the output ends of a pair of pneumatic drive devices arranged opposite to each other, or each centering plate of the centering part is hinged to the output ends of a plurality of pneumatic drive devices arranged at equal intervals in the circumferential direction.

[0026] According to an optional embodiment of the present invention, the base is formed with a plurality of weight-reducing holes at a plurality of positions that are centrally symmetrical about the rotation axis.

[0027] According to a second aspect of the present invention, a processing device is provided, wherein the processing device at least comprises a chuck for a processing device according to any one of the above embodiments.

[0028] According to an optional embodiment of the present invention, the processing device is a tube cutting machine, in particular a laser tube cutting machine.

[0029] According to some exemplary embodiments of the present invention, the centering accuracy of the chuck can be improved, and the clamping force can be easily adjusted according to the size of the workpiece, thereby avoiding deformation of the workpiece and helping to improve the processing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be described in more detail below with reference to the accompanying drawings, so that the principles, features and advantages of the present invention can be better understood. The accompanying drawings include:

[0031] Figure 1 A perspective view of a chuck for a processing device according to an exemplary embodiment of the present invention as viewed from a first side of a base is shown;

[0032] Figure 2 A perspective view of a chuck for a processing device according to an exemplary embodiment of the present invention as viewed from a second side of a base is shown;

[0033] Figure 3 A plan view of a chuck for a processing device according to an exemplary embodiment of the present invention viewed from a first side of a base is shown;

[0034] Figure 4 Shown along Figure 3 A cross-sectional view of a chuck for a processing device according to an exemplary embodiment of the present invention taken along line AA;

[0035] Figure 5 A plan view showing a chuck for a processing device according to an exemplary embodiment of the present invention, viewed from a second side of a base; and

[0036] Figure 6 A side view of a chuck for a machining device according to an exemplary embodiment of the present invention is shown. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial technical effects to be solved by the present invention more clearly understood, the present invention will be further described in detail below in conjunction with the accompanying drawings and multiple exemplary embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the scope of protection of the present invention.

[0038] For the purpose of clear description, directional or orientation terms may be used in this article, but unless otherwise specified, any directional or orientation terms involved are relative to normal usage status, but this does not mean that this direction or orientation is the case in any scenario.

[0039] Figure 1 A perspective view of a chuck 1 for a processing device according to an exemplary embodiment of the present invention as viewed from a first surface 201 of a base 2 is shown. Figure 2 A perspective view of a chuck 1 for a processing device according to an exemplary embodiment of the present invention as viewed from a second surface 202 of a base 2 is shown. Figure 3 A plan view of a chuck 1 for a processing device according to an exemplary embodiment of the present invention as viewed from a first surface 201 of a base 2 is shown. Figure 4 Shown along Figure 3 A cross-sectional view of a chuck 1 for a processing device according to an exemplary embodiment of the present invention taken along line AA in FIG.

[0040] Figure 5 A plan view of a chuck 1 for a processing device according to an exemplary embodiment of the present invention as viewed from a second surface 202 of a base 2 is shown. Figure 6 A side view of a chuck 1 for a machining device according to an exemplary embodiment of the present invention is shown.

[0041] Before officially starting the description, it should be noted that due to the viewing angle and the space limitations of the figure marks in the figures, some figure marks are not marked in all views. Therefore, when referring to the description, if necessary, you can refer to multiple views at the same time to facilitate understanding, but this does not mean that all features must appear at the same time in all embodiments.

[0042] like Figures 1 to 6 As shown, a chuck 1 for a machining device according to an exemplary embodiment of the present invention includes a base 2 rotatable around a rotation axis L, a driving unit 3 mounted on the base 2 as a power source, a jaw unit 4 movably mounted on the base 2 to be able to grip a workpiece, and a centering transmission unit 5.

[0043] The base 2 is generally formed in a plate shape perpendicular to the rotation axis L, and has a first surface 201 as a mounting surface and a second surface 202 opposite to the first surface, wherein the drive unit 3 and the centering transmission unit 5 are mounted on the first surface 201, and the claw unit 4 is mounted on the second surface 202. A plurality of guide rail structures 21 for guiding the gripping movement of the claw unit 4 are formed on the base 2, each of which is formed to extend in a radial direction perpendicular to the rotation axis L, and includes a guide groove 211 that penetrates the main body of the base 2 in the direction of the rotation axis L and a guide track 212 provided on the second surface 202. A central area of ​​the base 2 is formed with a central shaft 22 that is coaxial with the rotation axis L and protrudes from the first surface 201 in a direction parallel to the rotation axis L, and the central area of ​​the central shaft 22 except for the peripheral portion is penetrated along the rotation axis L, that is, it is hollow. Preferably, the base 2 is also formed with a plurality of weight-reducing holes 23 at a plurality of positions that are symmetrical about the rotation axis L and different from the guide rail structure 21.

[0044] As described above, the drive unit 3 is arranged on the first surface 201 of the base 2, and includes a plurality of pneumatic drive devices 30, such as cylinders. The plurality of pneumatic drive devices 30 are arranged at a plurality of positions that are equally spaced in the circumferential direction around the rotation axis L and are different from the positions of the guide rail structure 21. Each pneumatic drive device 30 has a mounting end 31 and an output end 32, and is pivotally mounted on the base 2 at the mounting end 31, and is coupled to the centering transmission unit 5 at the output end 32 to output power to the centering transmission unit 5.

[0045] The claw unit 4 includes a plurality of claw assemblies 40, such as Figure 2 , Figure 4 and Figure 5 As shown in the figures, each jaw assembly 40 includes: a jaw 41, which is used to directly contact the workpiece to be processed; a jaw seat 42, which cooperates with the guide rail 212 and can slide along the guide rail 212; a jaw arm 43, which fixes the jaw 41 to the jaw seat 42; and a drive shaft 44, which is fixedly mounted on the jaw seat 42 and is arranged to pass through the guide groove 211 and couple with the centering transmission unit 5 at the first surface 201 (specifically, hinged with the corresponding connecting rod 52 of the connecting rod part, which will be described in detail later), as shown in the figures. Figure 3 and Figure 4 shown.

[0046] The centering transmission unit 5 is used to transmit the power from the driving unit 3 to the claw unit 4 to realize the centering grasping and clamping of the workpiece. The centering transmission unit 5 includes a centering part coupled with the driving unit 3 and capable of rotating only around the rotation axis L, and a connecting rod part hinged with the claw unit 4 to drive the claw unit 4 to perform the grasping movement, wherein the centering part is hinged with the connecting rod part.

[0047] The centering portion includes at least one centering plate 51, each centering plate 51 having an annular main body portion 511, a plurality of connecting rod hinge portions 512 radially protruding outward from the main body portion 511 at positions equally spaced in the circumferential direction, and at least one driving hinge portion 513 radially protruding outward from the main body portion 511 at a position different from the plurality of connecting rod hinge portions 512. The centering plate 51 can be coaxially rotatably mounted on the base 2, for example, Figure 1 As shown in the figure, the main body 511 is mounted on the periphery of the central shaft 22 and mounted on the base 2. Each centering plate 51 is hinged to the output end 32 of at least one, optionally two, pneumatic drive devices 30 arranged opposite to each other through its driving hinge 513 so as to be driven by the pneumatic drive device 30 to perform the rotation, and is hinged to the connecting rod part through its connecting rod hinge 512.

[0048] The connecting rod portion includes a plurality of connecting rods 52 corresponding to each of the plurality of claw assemblies 40, wherein the plurality of claw assemblies 40 are grouped into at least one group corresponding to at least one centering plate 51, and the plurality of claw assemblies 40 in each group are arranged at equal intervals in the circumferential direction and are transmission-connected to the corresponding centering plate 51 through the corresponding plurality of connecting rods 52. The first end of each connecting rod 52 is hinged to the corresponding centering plate 51 at the corresponding connecting rod hinge portion 512 of the corresponding centering plate 51, and the second end opposite to the first end is hinged to the driving shaft 44 of the claw assembly 40 passing through the guide groove 211, as shown in FIG. Figure 3 and Figure 4 Preferably, each connecting rod 52 is formed as an integral connecting rod.

[0049] In a preferred embodiment, Figures 1 to 6As shown, the centering part includes two centering plates 51 which are superimposedly installed on the periphery of the central shaft 22 along the direction of the rotation axis L, and each centering plate 51 is hinged with two pneumatic drive devices 30 arranged oppositely at two driving hinges 513 formed oppositely. The jaw unit 4 includes two groups of jaw assemblies 40, each group of jaw assemblies 40 includes two jaw assemblies 40 arranged oppositely, and a total of four jaw assemblies 40 are arranged at equal intervals in the circumferential direction, and each group of jaw assemblies 40 is connected to a corresponding centering plate 51 through two corresponding connecting rods 52. In this way, each centering plate 51 is driven by a pair of driving units 3 at opposite positions, and drives a pair of connecting rods 52 to move at another pair of opposite positions, thereby driving the opposite pair of jaw assemblies 40 to perform a grasping movement. Of course, the chuck 1 can also be configured such that the jaw unit 4 includes two groups and six jaw assemblies 40, and each centering plate 51 drives three jaw assemblies 40 arranged at equal intervals in the circumferential direction through three connecting rods 52.

[0050] In an optional embodiment, the centering part may include only one centering plate 51, which is hinged to two, three or four pneumatic drive devices 30 arranged at equal intervals in the circumferential direction through corresponding driving hinges 513. The jaw unit 4 includes a group of jaw assemblies 40, which includes two, three, four or more jaw assemblies 40 arranged at equal intervals in the circumferential direction, and these jaw assemblies 40 are connected to the centering plate 51 through corresponding connecting rods 52. In this way, the individual centering plates 51 are driven by the driving unit 3 at multiple positions symmetrical about the center of the rotation axis L, and drive the connecting rods 52 to move at multiple other positions symmetrical about the center of the rotation axis L, thereby driving multiple jaw assemblies 40 to perform gripping movements. In another optional embodiment, the chuck 1 can also be similarly configured to use three centering plates 51 to drive six or more jaw units 40. That is, the number and grouping of the pneumatic drive device 30, the centering plate 51, and the jaw assembly 40 of the chuck 1 can be appropriately adjusted as needed, as long as the centering transmission of the driving force can be achieved.

[0051] With the aid of the various centering transmission units 5, when clamping a workpiece, the driving unit 3 drives each centering plate 51 to perform a rotational motion around the rotation axis L, for example Figure 3 and Figure 5 As shown by the double arrow A in FIG. 1 , the rotating centering plate 51 drives the first ends of the corresponding multiple connecting rods 52 to move around the rotation axis L. Accordingly, each connecting rod 52 pulls or pushes the corresponding claw assembly 40 at the second end to move along the guide structure 21, that is, in the radial direction, as shown in FIG. Figure 5 As shown by the double arrows B and C in FIG. 4 , the gripping movement of the claw unit 4 , that is, the plurality of claw assemblies 40 , is achieved thereby.

[0052] like Figure 3As shown, when the claw assembly 40 is located at the first end claw position at the far end of the guide rail structure 21 away from the rotation axis L, a first angle of acute angle is formed between its corresponding connecting rod 52 and the corresponding guide groove 211, that is, between the corresponding guide rail structure 21, and when the claw assembly 40 is located at the second end claw position at the proximal end of the guide rail structure 21 close to the rotation axis L (not shown in the figure), a second angle of acute angle is formed between its corresponding connecting rod 52 and the corresponding guide rail structure 21, and the first angle is smaller than the second angle. Moreover, as the claw assembly 40 is driven by the connecting rod 52 from the first end claw position to the second end claw position, the angle between the connecting rod 52 and the corresponding guide rail structure 21 gradually increases. Accordingly, the proportion of the radial force component of the force applied by the connecting rod 52 to the claw assembly 40 decreases as the angle gradually increases. In this way, when the same driving force is transmitted by means of the connecting rod 52, as the component force of the driving force in the radial direction, the clamping force of the jaw unit 4 can decrease as its position approaches the second end jaw position (stroke reduction), and vice versa. In other words, when the same driving force is transmitted by means of the centering transmission unit 5, the clamping force of the jaw unit 4 on the clamped workpiece decreases as the radial size of the workpiece decreases, and vice versa.

[0053] By means of the above-mentioned structural characteristics of the chuck 1 according to the embodiment of the present invention, it is possible to easily ensure high centering accuracy while appropriately and easily adjusting the clamping force on the workpiece based on the size of the workpiece (the stroke size of the jaw assembly 40). Compared with various conventional centering chucks, the chuck 1 according to the embodiment of the present invention is easy to clamp small-sized and / or thin-walled pipes with a relatively small clamping force without causing damage thereto, and is easy to clamp large-sized and / or thick-walled pipes with a relatively large clamping force to ensure the clamping force. Moreover, the chuck 1 according to the embodiment of the present invention can have different clamping force adjustment characteristics due to the different radial dimensions of the clamped workpiece. Specifically, for large-sized workpieces, the clamping force can be quickly adjusted within a relatively large numerical range, while for small-sized workpieces, the adjustment of the clamping force can be slow and relatively accurate.

[0054] According to another aspect of the present invention, a processing device is provided, in particular a tube cutting machine, in particular a laser tube cutting machine, the processing device at least comprising a chuck for a processing device according to the present invention.

[0055] Although specific embodiments of the present invention are described in detail herein, they are provided for the purpose of explanation only and should not be considered to limit the scope of the present invention. Various substitutions, changes and modifications may also be conceived without departing from the spirit and scope of the present invention.

Claims

1. A chuck (1) for a processing device, comprising: A rotatable base (2); A driving unit (3) mounted on the base (2); A jaw unit (4) movably mounted on the base (2) and adapted to grip a workpiece to be processed; and A centering transmission unit (5), comprising: a centering portion configured to be driven by the driving unit (3) to rotate around the rotation axis (L) of the base (2); and a connecting rod part which is respectively hinged to the centering part and the claw unit (4) and transmits the rotational movement of the centering part to the claw unit (4) for gripping movement.

2. The chuck (1) for a processing device according to claim 1, wherein: The claw unit (4) includes a plurality of claw assemblies (40), and the connecting rod part includes a plurality of connecting rods (52) corresponding to the plurality of claw assemblies (40), and a first end of each connecting rod (52) is hinged to the centering part and a second end opposite to the first end is hinged to the corresponding claw assembly (40).

3. The chuck (1) for a processing device according to claim 2, wherein: A plurality of guide rail structures (21) extending along a radial direction perpendicular to the rotation axis (L) are provided on the base (2) corresponding to the plurality of claw assemblies (40), and the claw assemblies (40) are respectively adapted to be driven by the corresponding connecting rods (52) to perform the grasping movement along the corresponding guide rail structures (21); and / or Each of the connecting rods (52) is formed as an integral connecting rod.

4. The chuck (1) for a machining device according to claim 3, wherein: On a plane perpendicular to the rotation axis (L), when the claw assembly (40) is located at a first end claw position at the far end of the guide rail structure (21) away from the rotation axis (L), a first angle is formed between the connecting rod (52) hinged to the claw assembly (40) and the corresponding guide rail structure (21), and when the claw assembly (40) is located at a second end claw position at the proximal end of the guide rail structure (21) close to the rotation axis (L), a second angle is formed between the connecting rod (52) hinged to the claw assembly (40) and the corresponding guide rail structure (21), the first angle is smaller than the second angle, and the angle formed between the connecting rod (52) and the corresponding guide rail structure (21) gradually increases as the position of the corresponding claw assembly (40) changes from the first end claw position toward the second end claw position.

5. The chuck (1) for a machining device according to claim 3 or 4, wherein: The centering portion comprises at least one centering plate (51), and the centering plate (51) is mounted on the base (2) so as to be coaxially rotatable with the base (2); and / or The base (2) comprises a first surface (201) and a second surface (202) opposite to the first surface (201); the driving unit (3) and the centering transmission unit (40) are mounted on the first surface (201); and the claw unit (4) is mounted on the second surface (202).

6. The chuck (1) for a machining device according to claim 5, wherein: The base (2) has a central axis (22) coaxial with the rotation axis (L) and formed to protrude from the first surface (201), and the centering plate (51) is installed on the periphery of the central axis (22) and is suitable for rotating around the central axis (22); and / or The guide rail structure (21) comprises a guide groove (211) penetrating the base (2) in the direction of the rotation axis (L) and a guide track (212) arranged on the second surface (202).

7. The chuck (1) for a machining device according to claim 6, wherein: The centering plate (51) comprises: an annular main body portion (511); a plurality of connecting rod hinges (512) protruding radially outward from the main body portion (511) at a plurality of positions equally spaced in the circumferential direction around the rotation axis (L); and at least one driving hinge (513) protruding radially outward from the main body portion (511) at a position different from the plurality of connecting rod hinges (512); and / or Each of the claw assemblies (40) comprises a claw (41), a claw seat (42), a claw arm (43) fixedly connecting the claw (41) and the claw seat (42), and a drive shaft (44) fixedly mounted on the claw seat (42); the claw seat (42) cooperates with the guide track (212) and is able to slide along the guide track (212); the drive shaft (44) is hinged to the connecting rod portion at the first surface (201) via the guide groove (211).

8. The chuck (1) for a machining device according to claim 5, wherein: The jaw unit (4) includes at least one group of jaw assemblies (40) corresponding to the at least one centering plate (51), each group of jaw assemblies (40) includes a plurality of jaw assemblies (40) arranged at equal intervals in the circumferential direction around the rotation axis (L), and the plurality of jaw assemblies (40) of each group of jaw assemblies (40) are respectively connected to the corresponding centering plate (51) via the corresponding connecting rod transmission of the connecting rod part.

9. The chuck (1) for a machining device according to claim 8, wherein: The centering portion includes a centering plate (51), and the jaw unit (4) includes a group of jaw assemblies (40), and the group of jaw assemblies (40) includes two or more jaw assemblies (40); or The centering portion comprises two centering plates (51) installed in a stacked manner along the direction of the rotation axis (L), and the jaw unit (4) comprises two groups of jaw assemblies (40), each group of jaw assemblies (40) comprising two or more jaw assemblies (40); or The centering portion includes three centering plates (51) installed in a stacked manner along the direction of the rotation axis (L), and the jaw unit (4) includes three groups of jaw assemblies (40), each group of jaw assemblies (40) includes two or more jaw assemblies (40).

10. The chuck (1) for a machining device according to claim 9, wherein: All of the plurality of jaw assemblies (40) of the jaw unit (4) are arranged at equal intervals in the circumferential direction.

11. A chuck (1) for a machining device according to any one of claims 1 to 4 and 6 to 10, wherein: The drive unit (3) comprises a plurality of pneumatic drive devices (30) arranged at a plurality of equally spaced positions in the circumferential direction around the rotation axis (L), each of the pneumatic drive devices (30) being pivotally mounted on the base (2) at one end serving as a mounting end (31) and being hingedly connected to the centering portion at the other end serving as an output end (32); and / or The base (2) is formed with a plurality of weight-reducing holes (23) at a plurality of positions that are centrally symmetrical about the rotation axis (L).

12. A processing device, wherein: The processing device comprises at least a chuck (1) for a processing device according to any one of claims 1 to 11.

13. The processing device according to claim 12, wherein: The processing device is a tube cutting machine, in particular a laser tube cutting machine.

Images