Pneumatic rotary chuck

Abstract

The invention relates to the technical field of positioning chucks, in particular to a pneumatic rotating chuck which comprises a chuck body detachably connected with a plurality of clamping jaws, one end of the chuck body is connected with a positioning disc, the outer end face of the positioning disc is a supporting plane used for supporting a workpiece, and the upper end face of the positioning disc is provided with a connecting part used for being connected with a vacuum chuck. The vacuum chuck is selectively used for adsorbing a workpiece; the bottom of the rotary table fixing disc is connected with the hollow rotary table, and the upper part is connected with the bottom of the chuck body; a rotating part of the pneumatic sliding ring is connected to the bottom side of the rotary table fixing disc through a positioning piece. The pneumatic rotating chuck has the advantages of being high in positioning precision and convenient to use, the machining efficiency can be improved, and the workpiece applicability is better; and the structure is compact, the coaxiality is good, and the chuck body rotates more stably.

Description

Technical Field

[0001] The present invention relates to the technical field of positioning chucks, and particularly relates to a pneumatic rotary chuck. Background Art

[0002] A pneumatic three-jaw chuck is a fixture device driven by a pneumatic system and is widely used in fields such as machining and automated production lines, mainly for quickly clamping cylindrical or symmetric workpieces. For example, a rotary pneumatic clamping operation table disclosed in the authorized publication number CN220699357U has a fixed table fixedly installed at the bottom of the worktable, a servo motor fixedly installed on one side of the fixed table, a rotating table rotatably connected inside the fixed table, a fixing plate fixedly installed on one side of the rotating table, and a three-jaw cylinder fixedly installed on the top of the fixing plate. Such a three-jaw cylinder is also a conventional structure. The workpiece is clamped between the three jaws or between the stepped surfaces on the three jaws. Since the jaws are movable parts that often move, and due to the influence of manufacturing errors, the supporting planes in the stepped surfaces of the three jaws cannot be in the same plane. Then, for the case where high precision requirements are imposed on the end face machining of the workpiece, it is difficult to meet, and it can only be leveled manually before each machining. In addition, this chuck structure cannot clamp thin workpieces because the upper edge of the jaw will block the upper outer edge of the workpiece, affecting the machining of the upper end face of the thin workpiece. In addition, thin workpieces are not suitable for direct clamping by the jaws, otherwise the workpiece may be deformed. Summary of the Invention

[0003] The purpose of the present invention is to provide a pneumatic rotary chuck to solve the problems of difficult guarantee of positioning accuracy and poor applicability mentioned above.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] The pneumatic rotary chuck includes a chuck body, several jaws detachably connected thereto, a positioning disk connected to one end of the chuck body, the outer end face of the positioning disk being a supporting plane for supporting the workpiece, and a connecting portion for connecting a vacuum chuck being provided on the upper end face of the positioning disk, and the vacuum chuck being selectively used for adsorbing the workpiece;

[0006] A turntable fixing disk, its bottom being connected to a hollow rotary table and its upper part being connected to the bottom of the chuck body;

[0007] A pneumatic slip ring, its rotating part being connected to the bottom side of the turntable fixing disk through a positioning member.

[0008] Further, the jaw includes a seat body and a chuck head detachably connected to the seat body, and the chuck head includes a clamping portion for clamping the workpiece, and the clamping portion is located above the positioning disk.

[0009] Further, the positioning disk is suspended at the end of the chuck body through a bracket, and the bracket is detachably connected to the end of the chuck body.

[0010] Further, the bracket is a tripod, the positioning disk is connected to the bracket by screws, three bracket tubes are provided at intervals on the outer edge of the end of the chuck body, and the outer end of the bracket is connected to the upper end of the bracket tube.

[0011] Further, the bottom of the vacuum chuck is connected to the positioning disk by screws, and the two are in sealed cooperation. The upper end surface of the vacuum chuck forms an adsorption surface for adsorbing workpieces.

[0012] Further, the chuck includes an L-shaped chuck and a Z-shaped chuck that can be selectively used.

[0013] Further, the turntable fixing disk has a through hole corresponding to the inner hole of the hollow rotary table. A positioning boss is provided on the outer edge of the through hole of the turntable fixing disk, and a positioning groove is provided at the bottom of the chuck body. A wire outlet groove is provided on the upper side of the turntable fixing disk, and the wire outlet groove penetrates the positioning boss along the radial direction of the turntable fixing disk.

[0014] Further, a set of first bolt holes and a set of second bolt holes are provided on the outer periphery of the through hole of the turntable fixing disk. The first bolt holes are for the first bolts connecting the chuck body and the turntable fixing disk to pass through, and the second bolt holes are for the second bolts connecting the hollow rotary table and the turntable fixing disk to pass through.

[0015] Further, the positioning member is a positioning cylinder, and the positioning cylinder extends into the inner hole of the hollow rotary table. The positioning cylinder includes a cylinder that penetrates up and down and a connecting plate. A first positioning portion is provided on the outer edge of the connecting plate, and a through hole is provided at the center of the connecting plate for the movable air pipe of the pneumatic rotary chuck to pass through. A first positioning notch for positioning is provided on the lower side of the turntable fixing disk, and the first positioning portion is snapped into the first positioning notch. A third bolt hole is provided on the first positioning portion, and the connecting plate is connected to the lower side of the turntable fixing disk by a third bolt.

[0016] Further, an annular step groove is provided on the inner side of the lower part of the cylinder for abutting against the rotating part of the pneumatic slip ring; several second positioning portions are further provided on the outer edge of the connecting plate, and the second positioning portions and the first positioning portion are arranged at intervals in the circumferential direction. Several second positioning notches are provided at the upper end of the cylinder, and the second positioning portions are snapped into the second positioning notches. A fourth bolt hole is provided on the second positioning portion for a fourth bolt to pass through, and the connecting plate and the rotating part of the pneumatic slip ring are connected by the fourth bolt.

[0017] Advantages of the present invention:

[0018] At the end of the chuck body of the present invention, a positioning disk is connected. The outer end face of the positioning disk is a supporting plane for supporting the workpiece. The supporting plane is pre-machined and has a high flatness, which can meet the positioning requirements of the workpiece. Instead of relying on the jaws to support the bottom of the workpiece, the positioning disk is used to improve the flatness of the supporting plane of the lower end face of the workpiece to be machined. When the positioning disk is initially installed and used, it only needs to be leveled once, avoiding the trouble of leveling multiple times when replacing the workpiece or jaws, and improving the processing efficiency.

[0019] The jaws in the present invention are detachably connected, and different jaws can be replaced to adapt to workpieces of different sizes and specifications. A selectable vacuum chuck is designed. When dealing with thin workpieces, the vacuum chuck is installed on the positioning disk, and the workpiece is adsorbed by the vacuum chuck, avoiding the thin workpiece being deformed by the excessive clamping force of the jaws. At the same time, after the jaws retract, there is no blockage of the upper end of the workpiece, and it does not affect the machining of the outer edge of the upper end face of the workpiece.

[0020] The present invention uses a positioning cylinder to be positioned and matched with the rotating part of the pneumatic slip ring, and then connected. This not only improves the coaxial positioning effect, but also has better support stiffness, is not easy to deform, and has better stability during the rotation process. Brief Description of the Drawings

[0021] Figure 1 is a schematic external view of the pneumatic rotary chuck of the present invention;

[0022] Figure 2 is Figure 1 a schematic view of the cooperation between the chuck body and the positioning disk in ;

[0023] Figure 3 is a perspective view of the positioning disk;

[0024] Figure 4 is a perspective view of the bracket;

[0025] Figure 5 is a perspective view of the first chuck;

[0026] Figure 6 is a perspective view of the second chuck;

[0027] Figure 7 is a schematic view of the cooperation between the chuck body and the vacuum chuck;

[0028] Figure 8 is a perspective view of the third chuck;

[0029] Figure 9 is Figure 1 the A-A cross-sectional view in ;

[0030] Figure 10 is an exploded view of part of the structure;

[0031] Figure 11 It is a schematic diagram of the relative position before the cooperation between the turntable fixed disk and the chuck body;

[0032] Figure 12 It is a three-dimensional view of the connecting plate;

[0033] Figure 13 It is a three-dimensional view of the cylinder.

[0034] 1. Hollow turntable; 11. Turntable; 12. Servo motor; 13. Inner hole; 2. Claw; 21. First chuck; 211. Clamping part; 22. Seat body; 23. Second chuck; 24. Third chuck; 241. Thrust part; 3. Chuck body; 31. First connection hole; 32. Second connection hole; 33. Second positioning groove; 4. Turntable fixed disk; 41. Second bolt hole; 42. First bolt hole; 43. First positioning notch; 44. Wire outlet groove; 45. Second positioning boss; 5. Pneumatic slip ring; 51. Rotating part; 52. Fixed air pipe; 53. Support plate; 6. Bracket; 61. First positioning boss; 62. U-shaped notch; 63. Bracket pipe; 7. Positioning disk; 71. Support plane; 81. Cylinder; 811. Annular step groove; 812. Second positioning notch; 82. Connecting plate; 821. First positioning part; 822. Third bolt hole; 823. Second positioning part; 824. Fourth bolt hole; 9. Vacuum chuck; 91. Air joint. Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present invention.

[0036] Embodiments of the present invention:

[0037] As Figures 1-6 shown, a pneumatic rotary chuck includes a chuck body 3, and three claws 2 are detachably connected. The chuck body 3 has a structure of a pneumatic chuck. As Figure 1 shown in it, a first connection hole 31 and a second connection hole 32 for connecting an air pipe joint are provided to realize air intake and air outlet to control the movement of the claws 2. One end of the chuck body 3 is connected with a positioning disk 7, and the outer end face of the positioning disk 7 is a support plane 71 for supporting a workpiece. Here, the support refers to a conventional workpiece, such as a cylindrical part, which is vertically placed when machining its upper end part. The present invention is mainly applied to equipment such as laser cutting machines, and the workpieces processed are generally super-hard materials, belonging to the precision machining industry.

[0038] The upper end surface of the positioning plate 7 is a supporting plane 71 for supporting the workpiece. The supporting plane 71 is pre-finished, and its flatness can meet the requirements.

[0039] Three jaws 2 are evenly spaced along the circumference of the chuck body 3. The jaw 2 includes a seat body 22 and a chuck detachably connected to the seat body 22, defined as the first chuck 21. The first chuck 21 includes a clamping portion 211 for clamping the workpiece. The clamping portion 211 is located above the positioning plate 7 and does not interfere with the positioning plate 7 during operation.

[0040] As Figure 5 shown, a first chuck 21, as Figure 6 shown, another form of the chuck, denoted as the second chuck 23, are both L-shaped chucks with different sizes and applicable to workpieces of different specifications. One end of the first chuck 21 is fixed to the seat body 22 by screws, and the other end is used to contact the side surface of the workpiece; the first chuck 21 is installed in a similar manner.

[0041] As Figures 1-2 shown, the positioning plate 7 is suspended at the end of the chuck body 3 through a bracket 6. The bracket 6 is detachably connected to the said end of the chuck body 3. As Figure 4 shown, the bracket 6 is a tripod. The positioning plate 7 is connected to the bracket 6 by screws. Three bracket tubes 63 are spaced at intervals on the outer edge of one end of the chuck body 3. The outer end of the bracket 6 is connected to the upper end of the bracket tube 63 by screws, and the leveling can also be carried out during the initial installation by using this screw connection.

[0042] As Figure 4 shown, a U-shaped notch 62 is provided on the lower side of the outer end of the bracket 6, which cooperates with the outer cylindrical surface of the upper end of the bracket tube 63 and has a certain positioning effect during the initial installation.

[0043] As Figure 4 shown, a disc-shaped first positioning boss 61 is provided at the center of the bracket 6, and a first positioning groove for inserting and mating with the first positioning boss 61 is provided at the center of the positioning plate 7. The three legs of the bracket 6 are evenly spaced along the circumference of the first positioning boss 61, and each leg is located between two jaws 2, with a compact structure and avoiding interference.

[0044] In the above embodiments, it is possible to support the bottom of the cylindrical workpiece by using the positioning plate 7 and clamp and position it by using three L-shaped jaws 2. However, for thin workpieces, such as thin disc-shaped workpieces, it is not easy to clamp and position. For this situation, a spare structure is designed and can be selectively used. Moreover, it is mainly for the non-contact scenario between the laser processing head and the workpiece.

[0045] As Figure 7 and 8As shown, the upper end surface of the positioning disk 7 is provided with a connecting portion for connecting the vacuum chuck 9, and the vacuum chuck 9 is selectively used to adsorb the workpiece. In the case of thin workpieces, the vacuum chuck 9 is connected to the upper end surface of the positioning disk 7, and the upper end surface of the vacuum chuck 9 forms an adsorption surface for adsorbing the workpiece to support the bottom of the workpiece.

[0046] The vacuum chuck 9 is in the shape of a cylinder 81 with an open upper part, and its upper end surface is a precision-machined plane for supporting the workpiece. The bottom of the vacuum chuck 9 is connected to the positioning disk 7 by screws, and the two are sealed and fitted. The bottom of the vacuum chuck 96 has screw through holes, and the screws fixing the vacuum chuck 9 pass through the inside of the vacuum chuck 9. A sealing gasket can be installed between the bottom of the vacuum chuck 9 and the positioning disk 7, and together with the pressing force of the screws, sealing is achieved.

[0047] An air connector 91 is connected to the outer peripheral side of the vacuum chuck 96 for connecting a vacuum suction pipe and communicating with a vacuum pumping device.

[0048] In the scenario of the vacuum chuck 9, the chuck is replaced with a Z-shaped chuck, defined as the third chuck 24. One end of the third chuck 24 is used to connect to the seat body 22, and the other end forms a pushing portion 241. The upper end of the pushing portion 241 is higher than the upper end surface of the vacuum chuck 9, and the pushing portion 241 is used to contact the outer peripheral surface of the workpiece when centering the workpiece.

[0049] When processing thin workpieces, first place them on the upper end surface of the vacuum chuck 9. Before evacuating, first use the synchronous movement of the three jaws 2 to center the workpiece. At this time, too much clamping force is not required, and it is only necessary to make the workpiece move towards the center to complete centering. Evacuate the vacuum chuck 9 to generate negative pressure and generate an adsorption force on the workpiece to achieve the purpose of clamping the workpiece. Retract the three jaws 2. During the processing of the workpiece, use the vacuum chuck 9 to adsorb the workpiece, which avoids deforming the thin workpiece due to the excessive clamping force of the jaws 2. At the same time, after the jaws 2 are retracted, there is no obstruction to the upper end of the workpiece, and it does not affect the processing of the upper end surface of the workpiece. In addition, the positioning disk 7 is fixed, and the position of the vacuum chuck 9 is also fixed, so there is no need to level it multiple times when replacing the workpiece, improving the processing efficiency.

[0050] As Figure 1 and 9 shown, the turntable fixed disk 4 has its bottom connected to the hollow rotary table 1 and its upper part connected to the bottom of the chuck body 3. The hollow rotary table 1, also known as a hollow rotary platform, belongs to the prior art. The hollow rotary table 1 includes a mounting portion and a turntable 11. The mounting portion is provided with flange holes for connecting to the equipment body. The equipment can be a laser cutting machine, etc. A servo motor 12 is provided on one side of the mounting portion, and the servo motor 12 drives the turntable 11 to rotate through a transmission structure, thereby driving the chuck body 3 to rotate.

[0051] AsFigures 10 to 11 As shown, the turntable fixing plate 4 has through holes corresponding to the inner holes 13 of the hollow turntable 1. The outer edge of the through holes of the turntable fixing plate 4 is provided with second positioning bosses 45, and the bottom of the chuck body 3 is provided with second positioning grooves 33. The second positioning bosses 45 are circular arc-shaped protrusions, which extend into the second positioning grooves 33 during installation, and the outer diameter of the second positioning bosses 45 is adapted to the inner diameter of the second positioning grooves 33.

[0052] On the upper side of the turntable fixing plate 4, there is a wire outlet groove 44, and the wire outlet groove 44 runs through the second positioning boss 45 along the radial direction of the turntable fixing plate 4. The wire outlet groove 44 is for the movable air pipe (not shown) to pass through. The movable air pipe is used to connect the rotating part 51 of the pneumatic slip ring 5 and the chuck body 3. In this embodiment, the air pipe is defined as two parts. One part is the fixed air pipe 52 connected to the fixed part of the pneumatic slip ring 5, and the other part is the movable air pipe connected to the rotating part 51 of the pneumatic slip ring 5. The movable air pipe rotates with the rotating part 51 to avoid pipeline entanglement. After the movable air pipe extends upward from the through hole of the turntable fixing plate 4, it extends out from the wire outlet groove 44 and then is connected upward to the connection hole on the chuck body 3.

[0053] The rotating part 51 of the pneumatic slip ring 5 is connected to the bottom side of the turntable fixing plate 4 through a positioning member.

[0054] As Figure 11 shown, a set of first bolt holes 42 and a set of second bolt holes 41 are provided on the outer periphery of the through holes of the turntable fixing plate 4. The first bolt holes 42 are for the first bolts connecting the chuck body 3 and the turntable fixing plate 4 to pass through, and the second bolt holes 41 are for the second bolts connecting the hollow turntable 1 and the turntable fixing plate 4 to pass through.

[0055] The positioning member adopts a positioning cylinder. The positioning cylinder extends into the inner hole 13 of the hollow turntable 1. The positioning cylinder includes a cylindrical barrel 81 and a connecting plate 82 that penetrate up and down. As Figure 12 shown, the outer edge of the connecting plate 82 is provided with a first positioning portion 821. A perforation is provided at the center of the connecting plate 82 for the movable air pipe of the pneumatic rotating chuck to pass through. A first positioning notch 43 for positioning is provided on the lower side of the turntable fixing plate 4. The first positioning portion 821 is snapped into the first positioning notch 43. A third bolt hole 822 is provided on the first positioning portion 821, and the connecting plate 82 is connected to the lower side of the turntable fixing plate 4 through a third bolt.

[0056] As Figure 10 shown, an annular step groove 811 is provided on the inner side of the lower part of the cylindrical barrel 81 for abutting against the rotating part 51 of the pneumatic slip ring 5. As Figure 12As shown, several second positioning parts 823 are further provided on the outer edge of the connecting plate 82. The second positioning parts 823 and the first positioning parts 821 are arranged at intervals in the circumferential direction. Several second positioning notches 812 are provided at the upper end of the cylinder 81, and the second positioning parts 823 are snapped into the second positioning notches 812. A fourth bolt hole 824 is provided on the second positioning part 823, and the fourth bolt hole 824 is for the fourth bolt to pass through. The fourth bolt extends into the cylinder 81 from top to bottom and connects the rotating part 51 of the pneumatic slip ring 5. The cooperation of the cylinder 81 and the connecting plate 82 as an intermediate connecting member not only achieves a coaxial positioning effect, but also has better supporting stiffness, is not easily deformed, and has better stability.

[0057] As Figure 1 shown, a support plate 53 is connected to the fixed part of the pneumatic slip ring 5. One part of the support plate 53 is connected to the fixed part, and the other part is connected to the equipment base. During use, the fixed part of the pneumatic slip ring 5 is stationary, and the rotating part 51 is rotationally assembled with the fixed part, enabling gas communication between the fixed air pipe 52 and the movable air pipe. The principle of the pneumatic slip ring 5 is also the prior art.

[0058] The serial numbers assigned to the components in this article, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. And the "connection" and "coupling" mentioned in this application, unless otherwise specified, both include direct and indirect connection (coupling). In the description of the invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the invention 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 therefore should not be construed as a limitation of the invention.

[0059] In the invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

Claims

1. Pneumatic rotary chuck, characterized in that: It includes a chuck body, to which a number of jaws are detachably connected. One end of the chuck body is connected with a positioning plate. The outer end face of the positioning plate is a supporting plane for supporting a workpiece. The upper end face of the positioning plate is provided with a connecting part for connecting a vacuum chuck, and the vacuum chuck is selectively used for adsorbing the workpiece. A turntable fixing plate, whose bottom is connected with a hollow rotary table and whose upper part is connected with the bottom of the chuck body. A pneumatic slip ring, whose rotating part is connected to the bottom side of the turntable fixing plate through a positioning member.

2. The pneumatic rotary chuck according to claim 1, wherein: The jaw includes a seat body and a chuck detachably connected to the seat body. The chuck includes a clamping part for clamping the workpiece, and the clamping part is located above the positioning plate.

3. The pneumatic rotary chuck according to claim 1, characterized in that: The positioning plate is suspended at the end of the chuck body through a bracket, and the bracket is detachably connected to the end of the chuck body.

4. The pneumatic rotary chuck according to claim 3, characterized in that: The bracket is a tripod. The positioning plate is connected to the bracket by screws. Three bracket tubes are arranged at intervals on the outer edge of the end of the chuck body, and the outer end of the bracket is connected to the upper end of the bracket tube.

5. The pneumatic rotary chuck according to claim 1, wherein: The bottom of the vacuum chuck is connected to the positioning plate by screws, and the two are in sealed cooperation. The upper end face of the vacuum chuck forms an adsorption surface for adsorbing the workpiece.

6. The pneumatic rotary chuck according to claim 2, wherein: The chuck includes an optionally used L-shaped chuck and a Z-shaped chuck.

7. The pneumatic rotary chuck according to claim 1, characterized in that: The turntable fixing plate has a through hole corresponding to the inner hole of the hollow rotary table. The turntable fixing plate is provided with a positioning boss on the outer edge of the through hole. The bottom of the chuck body is provided with a positioning groove. An outgoing wire groove is arranged on the upper side of the turntable fixing plate, and the outgoing wire groove radially penetrates through the positioning boss along the turntable fixing plate.

8. The pneumatic rotary chuck according to claim 7, wherein: The turntable fixing plate is provided with a set of first bolt holes and a set of second bolt holes on the outer periphery of the through hole. The first bolt holes are for the first bolts connecting the chuck body and the turntable fixing plate to pass through, and the second bolt holes are for the second bolts connecting the hollow rotary table and the turntable fixing plate to pass through.

9. The pneumatic rotary chuck according to claim 1, wherein: The positioning member adopts a positioning cylinder, and the positioning cylinder extends into the inner hole of the hollow rotary table. The positioning cylinder includes a cylinder body with upper and lower through holes and a connecting plate. The outer edge of the connecting plate is provided with a first positioning part, and a through hole is arranged at the center of the connecting plate for the movable air pipe of the pneumatic rotary chuck to pass through. A first positioning notch for positioning is arranged on the lower side of the turntable fixing plate, and the first positioning part is clamped into the first positioning notch. A third bolt hole is arranged on the first positioning part, and the connecting plate is connected to the lower side of the turntable fixing plate through a third bolt.

10. The pneumatic rotary chuck according to claim 9, characterized in that: An annular step groove is arranged on the inner side of the lower part of the cylinder body for abutting against the rotating part of the pneumatic slip ring. A number of second positioning parts are further arranged on the outer edge of the connecting plate, and the second positioning parts and the first positioning part are arranged at intervals in the circumferential direction. A number of second positioning notches are arranged at the upper end of the cylinder body, and the second positioning parts are clamped into the second positioning notches. A fourth bolt hole is arranged on the second positioning part for the fourth bolt to pass through, and the connecting plate and the rotating part of the pneumatic slip ring are connected through the fourth bolt.

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