Composite jaw chuck

Abstract

The utility model discloses a composite clamping jaw chuck, and relates to the technical field of clamping equipment. The device structurally comprises a rotating disc, a first roller clamping device for vertical clamping, a second roller clamping device for transverse clamping, a clamping plate clamping device for transverse clamping, a gear and rack centering device, an air distribution disc, a bearing and a fluted disc. The turntable, the first roller clamping device, the second roller clamping device and the clamping plate clamping device are coaxially arranged; the fluted disc, the gas distribution disc, the bearing and the rotary disc are coaxially arranged. The chuck is provided with two pairs of roller clamping devices for normally clamping workpieces and centering the workpieces, and is also provided with a clamping plate clamping device; when material dragging is not needed, the clamping plate can be used as a middle clamp, and when material dragging is needed, the clamping plate stretches out to clamp a workpiece and drag the workpiece to move; one chuck integrates two functions, so that the cost is reduced; the three clamping devices can be clamped and loosened through the three air connecting ports, and operation is convenient and reliable.

Description

Technical Field

[0001] The utility model belongs to the technical field of clamping equipment, in particular to a composite clamping jaw chuck. Background Art

[0002] In the field of mechanical processing technology, a chuck is a common processing equipment used to clamp a workpiece for further processing such as cutting and punching. The mainstream configuration of the side-mounted laser tube cutting machine currently on the market is a main chuck, a middle chuck (roller), and a tail chuck (splint). The tail chuck only plays the role of dragging the workpiece, which is relatively limited and has a high cost. Among them, the patent with publication number CN111673103A discloses a double-action rack and pinion centering chuck that adopts a double-roller clamping method, but it still does not have the function of clamping and dragging materials. Among them, the patent with publication number CN213559945U-a pneumatic chuck with a new air path has most of the air path built in, reducing the use of external air pipes, making the chuck easy to maintain and improving the reliability of the chuck. However, it has only two air ports, which is insufficient for the chuck airway control of the existing roller clamping mechanism and splint clamping mechanism. In order to solve the problems of the single function and complex integrated control structure of the existing mainstream chucks, this application document provides a composite jaw chuck. Utility Model Content

[0003] The purpose of the utility model is to provide a composite jaw chuck, which integrates two functions by installing two pairs of roller clamping devices and a splint clamping device, thereby reducing costs. The three clamping devices can be clamped and released through three air inlets, and the operation is convenient and reliable.

[0004] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0005] The utility model discloses a composite jaw chuck, comprising a turntable, a first roller clamping device for vertical clamping, a second roller clamping device for horizontal clamping, a clamping plate clamping device for horizontal clamping, a gear rack centering device, a distribution plate, a bearing, and a toothed plate; the turntable, the first roller clamping device, the second roller clamping device, and the clamping plate clamping device are coaxially arranged and connected as a whole by a plurality of special-shaped fasteners; the toothed plate, the distribution plate, the bearing, and the turntable are coaxially arranged.

[0006] The gear disc is connected to the inner ring of the bearing; the inner ring of the bearing is connected to the turntable; the air distribution disc is connected to the outer ring of the bearing; two of the gear rack centering devices are installed on the first roller clamping device; two of the gear rack centering devices are installed on the second roller clamping device; the turntable is fixed with four cylinder gaskets by a number of the special-shaped fasteners; the turntable is installed with an outer cover on one side of the gear rack centering device.

[0007] As a preferred technical solution of the present invention, the gear rack centering device includes a gear box, a first mounting cavity is provided inside the gear box; a synchronous gear is provided in the first mounting cavity, and a centering shaft is provided at both ends of the synchronous gear, and the two centering shafts are movably mounted on the side walls of the gear box; two centering through holes are provided on the gear box, and the two centering through holes are respectively located at the upper and lower parts of the synchronous gear; two racks are movably mounted in the two centering through holes, and the two racks are respectively meshed with the synchronous gear, and the two racks are symmetrically distributed with the synchronous gear as the center; a synchronous gear is provided in the first mounting cavity, and a centering shaft is provided at both ends of the synchronous gear, and the two centering shafts are movably mounted on the side walls of the gear box; two centering through holes are provided on the gear box, and the two centering through holes are respectively located at the upper and lower parts of the synchronous gear; two racks are respectively movably mounted in the two centering through holes, and the two racks are respectively meshed with the synchronous gear, and the two racks are symmetrically distributed with the synchronous gear as the center; There are two centering bearings, and the two centering bearings are respectively sleeved on two centering shafts; the upper and lower ends of the first mounting cavity are movably installed with pre-tightening covers, and a second mounting cavity is provided in the pre-tightening covers; a number of pre-tightening shafts are movably installed in the second mounting cavity, and a number of pre-tightening bearings are sleeved on the pre-tightening shafts; the upper pre-tightening bearing is in contact with the upper rack, and the lower pre-tightening bearing is in contact with the lower rack; a number of threaded holes are provided on the upper and lower parts of the gear box, and pre-tightening holes corresponding to the threaded holes are provided on the pre-tightening cover; the pre-tightening cover is fixedly connected to the gear box by screws, and the screws pass through the pre-tightening holes and the threaded holes respectively.

[0008] As a preferred technical solution of the present invention, four reinforcing connecting plates are installed between the first roller clamping device, the second roller clamping device and the clamping plate clamping device.

[0009] As a preferred technical solution of the present invention, the first roller clamping device includes two pairs of first cylinders, a pair of first cylindrical guide rails, a pair of first slides slidingly matched with the first cylindrical guide rails, and two groups of first rollers; a pair of the first cylindrical guide rails are installed between the two pairs of the first cylinders; a group of the first rollers are respectively installed on the opposite sides of the two first slides; the telescopic end of the first cylinder is connected to the adjacent first slides; a gear rack centering device is respectively installed at both ends of a pair of first slides; the rack end of the gear rack centering device is clamped and fixed to the end of the first slide; the first cylinder is connected to the reinforcing connecting plate by a second bolt.

[0010] As an optimal technical solution of the present invention, the second roller clamping device comprises two pairs of second cylinders, a pair of second cylindrical guide rails, a pair of second slides slidingly matched with the second cylindrical guide rails, and two groups of second rollers; a pair of second cylindrical guide rails is installed between the two pairs of second cylinders; a group of second rollers is installed on the opposite sides of the two second slides; the telescopic end of the second cylinder is connected to the adjacent second slides; a gear rack centering device is installed at both ends of a pair of second slides; the rack end of the gear rack centering device is clamped and fixed to the end of the second slide; the second cylinder is installed on the cylinder gasket through a number of the special-shaped fasteners; the second cylinder is connected to the reinforcing connecting plate through a second bolt.

[0011] As an optimal technical solution of the present invention, the splint clamping device comprises two pairs of third cylinders, a pair of third cylindrical guide rails, a pair of third slides slidingly matched with the third cylindrical guide rails, and two splints; a pair of the third cylindrical guide rails are installed between the two pairs of the third cylinders; one splint is installed on each of the opposite sides of the two third slides; the telescopic end of the third cylinder is connected to the adjacent third slide; the third cylinder is connected to the second cylinder by a bolt; and the third cylinder is connected to the reinforcing connecting plate by a second bolt.

[0012] As a preferred technical solution of the present invention, the gear disc and the air distribution disc rotate relative to each other, and form three coaxially arranged relatively closed air chambers, namely the first annular air chamber, the second annular air chamber, and the third annular air chamber from the inside to the outside; the air distribution disc is provided with a first air inlet, a second air inlet and a third air inlet; the first air inlet, the second air inlet and the third air inlet are respectively connected to the first annular air chamber, the third annular air chamber and the second annular air chamber.

[0013] As an optimal technical solution of the present invention, the toothed disc is provided with a first air guide hole A connected to the first annular air chamber; the toothed disc is provided with four second air guide holes A connected to the second annular air chamber; the toothed disc is provided with a third air guide hole A connected to the third annular air chamber.

[0014] As an optimal technical solution of the present invention, the bearing is provided with a first air guide hole B connected to the first air guide hole A, four second air guide holes B respectively connected to the four second air guide holes A, and a third air guide hole B connected to the third air guide hole A.

[0015] As an optimal technical solution of the present invention, the turntable is provided with a first air guide threaded hole connected to the first air guide hole B, four second air guide threaded holes respectively connected to the four second air guide holes B, and a third air guide threaded hole connected to the third air guide hole B.

[0016] The utility model has the following beneficial effects:

[0017] 1. In addition to two pairs of roller clamping devices for normal workpiece clamping and centering, this chuck also features a clamping plate. When material dragging is not required, the chuck can be used as a center clamp. When material dragging is required, the clamping plate extends to clamp the workpiece and drag it. This single chuck combines two functions, reducing costs.

[0018] 2. This utility model has three layers of air cylinders. The cylinders of the first and second roller clamping devices are controlled by the first air port and operate independently of each other. The cylinder of the plate clamping device is controlled by the second air port and operates independently of each other. The first, second, and plate clamping devices share a third air port to control the release operation. This provides simple and efficient control of the three clamping devices.

[0019] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a structural schematic diagram of the composite jaw chuck of the utility model.

[0022] Figure 2 for Figure 1 Schematic diagram of the structural decomposition.

[0023] Figure 3 for Figure 1 Schematic diagram of the structure without the outer cover.

[0024] Figure 4 for Figure 3 Schematic diagram of the structure of the clamping device with the splint removed.

[0025] Figure 5 for Figure 4 Schematic diagram of the structure without the second roller clamping device.

[0026] Figure 6 This is a structural diagram of the gas distribution panel.

[0027] Figure 7 This is a structural perspective view of the gas distribution panel.

[0028] Figure 8 Schematic diagram of the bearing structure.

[0029] Figure 9 This is a structural perspective view of the bearing.

[0030] Figure 10 Schematic diagram of the structure of the gear disc.

[0031] Figure 11 This is a structural perspective view of the gear disc.

[0032] Figure 12 Schematic diagram of the structure of the turntable.

[0033] Figure 13 This is a structural perspective view of the turntable.

[0034] Figure 14 This is a structural perspective diagram of the turntable from another angle.

[0035] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0036] 1-turntable, 2-first roller clamping device, 3-second roller clamping device, 4-plywood clamping device, 5-gear rack centering device, 6-gas distribution plate, 7-bearing, 8-toothed plate, 9-special-shaped fastener, 10-cylinder gasket, 11-outer cover, 12-reinforced connecting plate, 13-first annular air chamber, 14-second annular air chamber, 15-third annular air chamber, 61-first air port, 62-second air port, 63-third air port, 81-first air guide hole A, 82-second air guide hole A, 83-third air guide hole A, 71-first air guide hole B, 72-second air guide hole B, 73-third air guide hole B, 101-first air guide threaded hole, 102-second air guide threaded hole, 103-third air guide threaded hole. DETAILED DESCRIPTION

[0037] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Specific embodiment one:

[0039] See also Figure 1-14As shown, the present invention is a composite jaw chuck comprising a turntable 1, a first roller clamping device 2 for vertical clamping, a second roller clamping device 3 for horizontal clamping, a clamping plate clamping device 4 for horizontal clamping, a rack-and-pinion centering device 5, a distribution plate 6, a bearing 7, and a toothed disc 8. The turntable 1, the first roller clamping device 2, the second roller clamping device 3, and the clamping plate clamping device 4 are coaxially arranged and connected together by a number of special-shaped fasteners 9. The toothed disc 8, the distribution plate 6, the bearing 7, and the turntable 1 are coaxially arranged; the toothed disc 8 is connected to the inner ring of the bearing 7; the inner ring of the bearing 7 is connected to the turntable 1; and the distribution plate 6 is connected to the outer ring of the bearing 7. When the composite jaw chuck is in use, the distribution plate 6 is mounted on the equipment base. Two rack-and-pinion centering devices 5 are mounted on the first roller clamping device 2. Two rack-and-pinion centering devices 5 are mounted on the second roller clamping device 3. Four cylinder spacers 10 are mounted and fixed to the turntable 1 via a number of special-shaped fasteners 9. The turntable 1 is provided with an outer cover 11 on one side of the gear rack centering device 5. The main body of the special-shaped fastener 9 is a hexagonal prism, one end of which is provided with a threaded column head, and the other end of the hexagonal prism is provided with an internal threaded hole threadedly connected with the threaded column head.

[0040] The rack-and-gear centering device 5 includes a gear box with a first mounting cavity defined within it. A synchronous gear is housed within the first mounting cavity, with centering shafts mounted at both ends of the synchronous gear. The two centering shafts are movably mounted on the sidewalls of the gear box. The gear box is provided with two centering holes, located above and below the synchronous gear, respectively. Two racks are movably mounted within each of the centering holes, each meshing with the synchronous gear and symmetrically distributed about the synchronous gear. Two centering bearings are located within the first mounting cavity, each mounted on a centering shaft. Preload covers are movably mounted at both the upper and lower ends of the first mounting cavity, each housing a second mounting cavity. Several preload shafts are movably mounted within the second mounting cavity, each housing a plurality of preload bearings. The upper preload bearing contacts the upper rack, while the lower preload bearing contacts the lower rack. The gear box has several threaded holes on its upper and lower sections, and the preload cover has corresponding preload holes. The preload cover is fixed to the gear box with screws that pass through the preload holes and threaded holes, respectively. Four reinforcing connecting plates 12 are installed between the first roller clamping device 2, the second roller clamping device 3, and the clamping plate clamping device 4.

[0041] The first roller clamping device 2 comprises two pairs of first cylinders, a pair of first cylindrical guide rails, a pair of first slides that slide with the first cylindrical guide rails, and two sets of first rollers. The first cylindrical guide rails are mounted between the two pairs of first cylinders. A set of first rollers is mounted on opposite sides of each first slide. The telescopic ends of the first cylinders are connected to adjacent first slides. A rack-and-pinion centering device 5 is mounted at each end of a pair of first slides. The rack ends of the rack-and-pinion centering device 5 are clamped and fixed to the ends of the first slides. The first cylinders are connected to the reinforcing connecting plate 12 via second bolts.

[0042] The second roller clamping device 3 comprises two pairs of second cylinders, a pair of second cylindrical guide rails, a pair of second slides that slide in conjunction with the second cylindrical guide rails, and two sets of second rollers. The pair of second cylindrical guide rails is mounted between the two pairs of second cylinders. A set of second rollers is mounted on opposite sides of each second slide. The telescopic ends of the second cylinders are connected to adjacent second slides. A rack and pinion centering device 5 is mounted at each end of a pair of second slides. The rack end of the rack and pinion centering device 5 is clamped and fixed to the end of the second slide. The second cylinder is mounted on a cylinder block 10 via a number of special-shaped fasteners 9. The second cylinder is connected to a reinforcing connecting plate 12 via second bolts.

[0043] The clamping plate clamping device 4 comprises two pairs of third cylinders, a pair of third cylindrical guide rails, a pair of third slides that slide with the third cylindrical guide rails, and two clamping plates. The third cylindrical guide rails are mounted between the two pairs of third cylinders. A clamping plate is mounted on each of the opposing sides of the two third slides. The telescopic ends of the third cylinders are connected to the adjacent third slides. The third cylinders are bolted to the second cylinders. The third cylinders are then bolted to the reinforcing connecting plate 12 via second bolts.

[0044] Among them Figure 6-7 As shown, the gear plate 8 and the air distribution plate 6 rotate relative to each other, forming three coaxially arranged, relatively closed air chambers: the first annular air chamber 13, the second annular air chamber 14, and the third annular air chamber 15. The air distribution plate 6 is provided with a first air inlet 61, a second air inlet 62, and a third air inlet 63. The first air inlet 61, the second air inlet 62, and the third air inlet 63 are connected to the first annular air chamber 13, the third annular air chamber 15, and the second annular air chamber 14, respectively.

[0045] Among them Figure 10-11 As shown, the toothed disc 8 has a first air guide hole A81 communicating with the first annular air chamber 13, four second air guide holes A82 communicating with the second annular air chamber 14, and a third air guide hole A83 communicating with the third annular air chamber 15.

[0046] Among them Figure 8-9As shown, the bearing 7 is provided with a first air guide hole B71 connected to the first air guide hole A81, four second air guide holes B72 respectively connected to the four second air guide holes A82, and a third air guide hole B73 connected to the third air guide hole A83.

[0047] Among them Figure 12-14 As shown, the turntable 1 is provided with a first air guide threaded hole 101 connected to the first air guide hole B71, four second air guide threaded holes 102 respectively connected to the four second air guide holes B72, and a third air guide threaded hole 103 connected to the third air guide hole B73.

[0048] The two pairs of first cylinder rodless chambers of the first roller clamping device 2 and the two pairs of second cylinder rodless chambers of the second roller clamping device 3 take air from the first air guide threaded hole 101. The first air inlet 61 controls the synchronous clamping operation of the first roller clamping device 2 and the second roller clamping device 3.

[0049] The two pairs of third cylinder rodless chambers of the clamping plate clamping device 4 take air from the third air guide threaded hole 103. The second air inlet 62 controls the clamping operation of the clamping plate clamping device 4.

[0050] The two pairs of first cylinder rod cavities of the first roller clamping device 2, the second cylinder rod cavities of the second roller clamping device 3, and the two pairs of third cylinder rod cavities of the clamping plate clamping device 4 draw air from the four second air guide threaded holes 102. The first roller clamping device 2, the second roller clamping device 3, and the clamping plate clamping device 4 share a third air inlet 63. This third air inlet 63 controls the joint release of the first roller clamping device 2, the second roller clamping device 3, and the clamping plate clamping device 4.

[0051] This design utilizes three layers of air cylinders. The cylinders of the first roller clamping device 2 and the second roller clamping device 3 are controlled by the first air port 61 and operate independently of each other. The cylinder of the plate clamping device 4 is controlled by the second air port 62 and operates independently of each other. The first roller clamping device 2, the second roller clamping device 3, and the plate clamping device 4 share the third air port 63 to control the release operation.

[0052] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0053] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments do not describe all details in detail, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A composite jaw chuck, characterized by: It comprises a turntable (1), a first roller clamping device for vertical clamping (2), a second roller clamping device for horizontal clamping (3), a clamping plate clamping device for horizontal clamping (4), a gear rack centering device (5), a gas distribution plate (6), a bearing (7), and a gear plate (8); The turntable (1), the first roller clamping device (2), the second roller clamping device (3) and the clamping plate clamping device (4) are coaxially arranged and connected as a whole via a plurality of special-shaped fasteners (9); The gear disc (8), the gas distribution disc (6), the bearing (7) and the rotary disc (1) are coaxially arranged; The toothed disc (8) is connected to the inner ring of the bearing (7); the inner ring of the bearing (7) is connected to the turntable (1); the gas distribution disc (6) is connected to the outer ring of the bearing (7); Two gear rack centering devices (5) are installed on the first roller clamping device (2); Two gear rack centering devices (5) are installed on the second roller clamping device (3); The turntable (1) is fixed with four cylinder pads (10) via a plurality of special-shaped fasteners (9); The rotating disk (1) is located on one side of the gear rack centering device (5) and is equipped with an outer cover (11).

2. The composite jaw chuck according to claim 1, characterized in that: The gear rack centering device (5) comprises a gear box, wherein a first mounting cavity is provided inside the gear box; a synchronous gear is provided in the first mounting cavity, and a centering shaft is provided at both ends of the synchronous gear, and the two centering shafts are movably mounted on the side walls of the gear box; two centering through holes are provided on the gear box, and the two centering through holes are respectively located at the upper part and the lower part of the synchronous gear; two racks are movably mounted in the two centering through holes, and the two racks are respectively meshed with the synchronous gear, and the two racks are centrally symmetrically distributed with the synchronous gear as the center; two centering bearings are provided in the first mounting cavity. , the two centering bearings are respectively sleeved on the two centering shafts; the upper and lower ends of the first mounting cavity are movably installed with pre-tightening covers, and a second mounting cavity is provided in the pre-tightening covers; a plurality of pre-tightening shafts are movably installed in the second mounting cavity, and a plurality of pre-tightening bearings are sleeved on the pre-tightening shafts; the upper pre-tightening bearing is in contact with the upper rack, and the lower pre-tightening bearing is in contact with the lower rack; a plurality of threaded holes are provided on the upper and lower parts of the gear box, and pre-tightening holes corresponding to the threaded holes are provided on the pre-tightening cover; the pre-tightening cover is fixedly connected to the gear box by screws, and the screws pass through the pre-tightening holes and the threaded holes respectively.

3. The composite jaw chuck according to claim 1, characterized in that: Four reinforcing connecting plates (12) are installed between the first roller clamping device (2), the second roller clamping device (3) and the clamping plate clamping device (4).

4. The composite jaw chuck according to claim 3, characterized in that: The first roller clamping device (2) comprises two pairs of first cylinders, a pair of first cylindrical guide rails, a pair of first slides slidingly matched with the first cylindrical guide rails, and two groups of first rollers; a pair of the first cylindrical guide rails is installed between the two pairs of the first cylinders; a group of the first rollers is respectively installed on the opposite sides of the two first slides; the telescopic end of the first cylinder is connected to the adjacent first slides; a gear rack centering device (5) is respectively installed at both ends of a pair of the first slides; the rack end of the gear rack centering device (5) is clamped and fixed to the end of the first slide; the first cylinder is connected to the reinforcing connecting plate (12) via a second bolt.

5. The composite jaw chuck according to claim 4, characterized in that: The second roller clamping device (3) comprises two pairs of second cylinders, a pair of second cylindrical guide rails, a pair of second slides slidably matched with the second cylindrical guide rails, and two groups of second rollers; a pair of the second cylindrical guide rails is installed between the two pairs of the second cylinders; a group of the second rollers is respectively installed on the opposite sides of the two second slides; the telescopic ends of the second cylinders are connected to the adjacent second slides; a gear rack centering device (5) is respectively installed at both ends of a pair of the second slides; the rack end of the gear rack centering device (5) is clamped and fixed to the end of the second slide; the second cylinder is installed on the cylinder pad (10) through a plurality of the special-shaped fasteners (9); and the second cylinder is connected to the reinforcing connecting plate (12) through a second bolt.

6. The composite jaw chuck according to claim 5, characterized in that: The clamping plate clamping device (4) comprises two pairs of third cylinders, a pair of third cylindrical guide rails, a pair of third slides slidably matched with the third cylindrical guide rails, and two clamping plates; a pair of the third cylindrical guide rails is installed between the two pairs of the third cylinders; one clamping plate is installed on each of the opposite sides of the two third slides; the telescopic end of the third cylinder is connected to the adjacent third slide; the third cylinder is connected to the second cylinder via a bolt; and the third cylinder is connected to the reinforcing connecting plate (12) via a second bolt.

7. The composite jaw chuck according to claim 1, characterized in that: The toothed disc (8) and the gas distribution disc (6) rotate relative to each other and form three coaxially arranged relatively closed air chambers, which are, from the inside to the outside, a first annular air chamber (13), a second annular air chamber (14), and a third annular air chamber (15); the gas distribution disc (6) is provided with a first air inlet (61), a second air inlet (62), and a third air inlet (63); the first air inlet (61), the second air inlet (62), and the third air inlet (63) are respectively connected to the first annular air chamber (13), the third annular air chamber (15), and the second annular air chamber (14).

8. The composite jaw chuck according to claim 7, characterized in that: The toothed disc (8) is provided with a first air guide hole A (81) communicating with the first annular air chamber (13); the toothed disc (8) is provided with four second air guide holes A (82) communicating with the second annular air chamber (14); and the toothed disc (8) is provided with a third air guide hole A (83) communicating with the third annular air chamber (15).

9. The composite jaw chuck according to claim 8, characterized in that: The bearing (7) is provided with a first air guide hole B (71) connected to the first air guide hole A (81), four second air guide holes B (72) respectively connected to the four second air guide holes A (82), and a third air guide hole B (73) connected to the third air guide hole A (83).

10. The composite jaw chuck according to claim 9, characterized in that: The turntable (1) is provided with a first air guide threaded hole (101) connected to the first air guide hole B (71), four second air guide threaded holes (102) respectively connected to the four second air guide holes B (72), and a third air guide threaded hole (103) connected to the third air guide hole B (73).

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