Pneumatic clamp

Abstract

The utility model relates to a pneumatic clamp which comprises a cylindrical frame body and an air cylinder. One end of the cylindrical frame body is provided with a first opening, and the other end of the cylindrical frame body is provided with a cover plate; a placing cavity for positioning a workpiece is formed in the cylindrical frame body; the multiple air cylinders are fixedly distributed at the first opening end of the cylindrical frame body in the circumferential direction in a circular ring shape. A cylinder shaft of each cylinder abuts against the peripheral wall of a to-be-machined structure on the workpiece. By means of the arrangement, compressed air is used for pushing the piston rods to support the outer circle of the workpiece, the outer circle of the workpiece is evenly stressed, the circle center is kept at the concentric position and does not deviate by means of the floatability of the piston rods, and the workpiece can be conveniently cut. Optionally, in the machining process, the workpiece and the cylindrical frame body are fixedly installed on a lathe rotating shaft or a lathe clamp and rotate along with the lathe rotating shaft, and therefore the workpiece can be turned conveniently.

Description

Technical Field

[0001] The utility model belongs to the technical field of clamps, and particularly relates to a pneumatic clamp. Background Art

[0002] For workpieces with a large overhang relative to the reference point and thin walls at the supporting parts, when using a lathe to turn the inner circle of the workpiece, it is easy to cause insufficient workpiece rigidity and tool vibration, which cannot meet the requirements of turning processing. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a pneumatic clamp to solve the technical problems such as tool vibration that easily occurs during workpiece processing.

[0004] In order to solve the above problems, the technical solution of the present invention is: a pneumatic clamp, comprising:

[0005] The cylindrical frame has a first opening at one end and a cover plate at the other end; the cylindrical frame has a placement cavity for positioning the workpiece;

[0006] There are a plurality of cylinders, which are fixedly distributed in a circular ring shape at the first open end of the cylindrical frame; the cylinder axis of each cylinder contacts the outer peripheral wall of the structure to be processed on the workpiece.

[0007] Optionally, the cylinders are opposed to each other in pairs, the piston rod axes of every two opposing cylinders coincide, and the piston rod axes all pass through the center of the circular ring.

[0008] Optionally, the axes of the piston rods of the plurality of cylinders are located on the same plane, and the axis of the cylindrical frame is perpendicular to the plane.

[0009] Optionally, the number of cylinders is greater than 3.

[0010] Optionally, the cylindrical frame includes a cylinder and an end ring seat, the end ring seat is coaxially and detachably fixed to one end of the cylinder, the cover plate is detachably fixed to the other end of the cylinder, and the cylinder is fixedly mounted on the end ring seat.

[0011] Optionally, the axis of the cylindrical frame coincides with the axis of the circular ring shape.

[0012] Optionally, a plurality of cylinders are evenly distributed circumferentially at the first open end of the cylindrical frame.

[0013] Optionally, the cylinder is fixedly mounted on the cylindrical frame through a locking device.

[0014] Optionally, the locking device includes a mounting seat, which corresponds to the cylinder one by one; the mounting seat is fixed to the first open end of the cylindrical frame by a fastener; an opening clamp is provided on the mounting seat, and a positioning slot for the piston rod to pass through is provided on the first opening frame, and the opening clamp adjusts the opening size of the positioning slot through the fastener.

[0015] Optionally, a connecting block is fixedly provided on the mounting seat, and the cylinder is fixed to the connecting block via fasteners.

[0016] Optionally, a clearance slot for the piston rod to pass through is provided on the connecting block.

[0017] Optionally, the connecting block includes a first clamping block and a second clamping block fixed on the mounting base, a gap is present between the first clamping block and the second clamping block, and a clearance slot is formed between the first clamping block and the second clamping block for the piston rod to pass through, the first clamping block is fixedly connected to the cylinder via a fastener, and the second clamping block is fixedly connected to the cylinder via a fastener.

[0018] Optionally, the cover plate is detachably fixed to the end of the cylindrical frame by fasteners, and a positioning plate is detachably fixedly provided at the inner end of the cover plate. A positioning hole coaxial with the cylindrical frame is provided on the positioning plate, and the positioning hole and the end of the cover plate form a positioning groove that cooperates with one end of the workpiece for positioning.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The utility model adopts a cylindrical frame to place the workpiece, and supports the outer circle of the workpiece through the contact of the piston shafts of several cylinders, thereby providing support for the outer circle of the workpiece to avoid deformation of the outer circle of the workpiece. Through the floating nature of the piston rod, the center of the workpiece is kept in a concentric position without deviation, avoiding the vibration of the knife, thereby ensuring smooth cutting of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the assembly of the pneumatic clamp and the workpiece in the embodiment;

[0022] Figure 2 A schematic structural diagram of a pneumatic clamp in an embodiment;

[0023] Figure 3 A schematic structural diagram of a workpiece in an embodiment;

[0024] Figure 4 Schematic diagram of the structure of the mounting base in the embodiment.

[0025] Figure numerals: 1. Cylindrical frame; 11. First opening; 12. Cover plate; 121. Opening; 13. Placement cavity; 14. Cylindrical body; 141. Second opening; 15. End ring seat; 2. Cylinder; 21. Piston rod; 3. Workpiece; 4. Mounting seat; 41. Opening clamp; 42. Positioning slot; 5. Connecting block; 51. Give way slot; 52. First clamping block; 53. Second clamping block; 6. Positioning plate; 61. Positioning slot. DETAILED DESCRIPTION

[0026] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0027] Example: Figures 1-4 As shown, this embodiment provides a pneumatic clamp, including a cylindrical frame 1 and a cylinder 2; one end of the cylindrical frame 1 has a first opening 11, and the other end of the cylindrical frame 1 has a cover plate 12; the cylindrical frame 1 has a placement cavity 13 for positioning the workpiece 3; there are a plurality of cylinders 2, and the cylinders 2 are fixedly distributed circumferentially in a circular shape at the end of the first opening 11 of the cylindrical frame 1; the piston rod 21 of each cylinder 2 contacts the outer peripheral wall of the structure to be processed on the workpiece 3.

[0028] Through the above arrangement, compressed air is used to push the multiple piston rods 21 to support the outer circle of the workpiece 3, thereby providing a certain support effect on the workpiece 3, preventing deformation of the outer circle of the workpiece 3, and making the outer circle of the workpiece 3 evenly stressed. The floating nature of the piston rods 21 is used to keep the center of the circle in a concentric position without deviation, thereby facilitating the cutting of the workpiece 3. Optionally, during machining, the workpiece 3 and the cylindrical frame 1 are fixedly mounted on a lathe shaft or lathe fixture, rotating with the lathe shaft, thereby facilitating the turning of the workpiece 3.

[0029] In a pneumatic clamp of this embodiment, an opening 121 is coaxially provided on the cover plate 12 to facilitate fixing the workpiece 3 and the cylindrical frame 1 on the lathe shaft or the lathe clamp.

[0030] In this embodiment of a pneumatic clamp, several cylinders 2 are positioned in pairs, with the piston rods 21 of each pair of cylinders 2 aligned and the axes of the piston rods 21 passing through the center of the annular ring. With the cylinders 2 positioned in pairs, the net force applied by the piston rods 21 is zero, preventing the center of the outer circle of the workpiece 3 from shifting, ensuring concentricity and precise machining of the workpiece 3.

[0031] In a pneumatic clamp of this embodiment, the axes of the piston rods 21 of the plurality of cylinders 2 are located on the same plane, and the axis of the cylindrical frame 1 is perpendicular to the plane. This arrangement improves processing accuracy.

[0032] In a pneumatic clamp of this embodiment, the number of cylinders 2 is greater than three. Optionally, six cylinders 2 are used. By having the piston rods 21 of multiple cylinders 2 contact the workpiece 3, the outer circle of the workpiece 3 is evenly stressed, which is better than a three-point stress, and prevents deformation of the outer circle of the workpiece 3.

[0033] In a pneumatic clamp of this embodiment, a cylindrical frame 1 includes a cylindrical body 14 and an end ring seat 15. The end ring seat 15 is coaxially and detachably fixed to one end of the cylindrical body 14, the cover plate 12 is detachably fixed to the other end of the cylindrical body 14, and the cylinder 2 is fixedly mounted on the end ring seat 15. The end ring seat 15 is easy to replace and easy to manufacture. If the end ring seat 15 is damaged, only the end ring seat 15 needs to be replaced, which saves costs.

[0034] Optionally, a plurality of second openings 141 are evenly distributed around the outer wall of the cylinder 14 to reduce weight.

[0035] In a pneumatic clamp of this embodiment, the axis of the cylindrical frame 1 coincides with the axis of the annular shape, thereby improving processing accuracy.

[0036] In a pneumatic clamp of this embodiment, a plurality of cylinders 2 are evenly distributed circumferentially at the end of the first opening 11 of the cylindrical frame 1 , thereby improving the uniformity of force applied to the outer circumference of the workpiece 3 .

[0037] In the pneumatic clamp of this embodiment, the cylinder 2 is fixedly mounted on the cylindrical frame 1 by a locking device, thereby improving the installation stability of the cylinder 2.

[0038] In a pneumatic clamp of this embodiment, the locking device includes a mounting seat 4, which corresponds to the cylinder 2 one by one; the mounting seat 4 is fixed to the end of the first opening 11 of the cylindrical frame 1 by a fastener; an opening clamp 41 is provided on the mounting seat 4, and a positioning slot 42 for the piston rod 21 to pass through is provided on the first opening 11 frame, and the opening clamp 41 adjusts the opening size of the positioning slot 42 by a fastener.

[0039] With this arrangement, a fastener passing through the split clamp 41 secures the piston rod 21 within the positioning slot 42, thereby providing support for the outer periphery of the workpiece 3 and providing sufficient rigidity to ensure smooth cutting. Optionally, the positioning slot 42 matches the outer periphery of the piston rod 21, further limiting the position of the piston rod 21.

[0040] In a pneumatic clamp of this embodiment, a connecting block 5 is fixedly provided on a mounting base 4, and the cylinder 2 is fixed to the connecting block 5 by fasteners. The setting of the mounting base 4 not only locks the piston rod 21 but also fixes the cylinder 2, with a simple structure and multiple functions.

[0041] In a pneumatic clamp of this embodiment, a clearance slot 51 is provided on the connecting block 5 for the piston rod 21 to pass through. Specifically, the clearance slot 51 is adjacent to the positioning slot 42 and their axes coincide with each other, thereby better positioning the piston rod 21.

[0042] In this embodiment of a pneumatic clamp, the connecting block 5 includes a first clamping block 52 and a second clamping block 53 fixed to the mounting base 4. A gap is formed between the first clamping block 52 and the second clamping block 53, and a clearance slot 51 is formed between the first clamping block 52 and the second clamping block 53 for the piston rod 21 to pass through. The first clamping block 52 is fixedly connected to the cylinder 2 via fasteners, and the second clamping block 53 is also fixedly connected to the cylinder 2 via fasteners. This simple structure improves the installation stability of the cylinder 2 and facilitates the assembly and disassembly of the cylinder 2.

[0043] In a pneumatic clamp of this embodiment, a cover plate 12 is removably secured to the end of a cylindrical frame 1 via fasteners. A positioning plate 6 is removably secured to the inner end of the cover plate 12. Positioning plate 6 defines a positioning hole coaxial with the cylindrical frame 1. The positioning hole and the end of the cover plate 12 form a positioning groove 61 that mates with one end of the workpiece 3. The small end of the workpiece 3 is positioned by fitting into the positioning groove 61. The outer diameter of the large end of the workpiece 3 to be machined is supported and positioned by a plurality of piston rods 21, thereby improving the installation stability of the workpiece 3. The fasteners can be bolts, screws, or other commonly used fasteners.

Claims

1. A pneumatic clamp, characterized in that: include: A cylindrical frame (1) having a first opening (11) at one end and a cover plate (12) at the other end; The cylindrical frame (1) has a placement cavity (13) for positioning the workpiece (3); The cylinders (2) are provided in a plurality, and the plurality of cylinders (2) are fixedly distributed in a circular ring shape at the end of the first opening (11) of the cylindrical frame (1); the piston rod (21) of each cylinder (2) contacts the outer peripheral wall of the structure to be processed on the workpiece (3).

2. A pneumatic clamp according to claim 1, characterized in that: A plurality of cylinders (2) are opposed to each other in pairs, and the axes of the piston rods (21) of every two opposed cylinders (2) coincide with each other, and the axes of the piston rods (21) all pass through the center of the circular ring.

3. A pneumatic clamp according to claim 1, characterized in that: The axes of the piston rods (21) of the plurality of cylinders (2) are located on the same plane, and the axis of the cylindrical frame (1) is perpendicular to the plane.

4. A pneumatic clamp according to claim 1, characterized in that: The number of cylinders (2) is greater than 3.

5. The pneumatic clamp according to claim 1, characterized in that: The cylindrical frame (1) comprises a cylindrical body (14) and an end ring seat (15). The end ring seat (15) is coaxially detachably fixed to one end of the cylindrical body (14). The cover plate (12) is detachably fixed to the other end of the cylindrical body (14). The cylinder (2) is fixedly mounted on the end ring seat (15).

6. The pneumatic clamp according to claim 1, characterized in that: The cylinder (2) is fixedly mounted on the cylindrical frame (1) through a locking device, the locking device comprising a mounting seat (4), the mounting seat (4) and the cylinder (2) being matched one-to-one; the mounting seat (4) is fixed to the end of the first opening (11) of the cylindrical frame (1) through a fastener; an opening clamp (41) is provided on the mounting seat (4), a positioning slot (42) for the piston rod (21) to pass through is provided on the first opening (11), and the opening size of the positioning slot (42) is adjusted by the opening clamp (41) through the fastener.

7. A pneumatic clamp according to claim 6, characterized in that: A connecting block (5) is fixedly arranged on the mounting seat (4), and the cylinder (2) is fixed on the connecting block (5) via a fastener.

8. The pneumatic clamp according to claim 7, characterized in that: The connecting block (5) is provided with a recessed slot (51) for the piston rod (21) to pass through.

9. The pneumatic clamp according to claim 8, characterized in that: The connecting block (5) comprises a first clamping block (52) and a second clamping block (53) fixed on the mounting seat (4); a gap is present between the first clamping block (52) and the second clamping block (53); and a clearance slot (51) for the piston rod (21) to pass through is formed between the first clamping block (52) and the second clamping block (53); the first clamping block (52) is fixedly connected to the cylinder (2) via a fastener; and the second clamping block (53) is fixedly connected to the cylinder (2) via a fastener.

10. The pneumatic clamp according to claim 1, characterized in that: The cover plate (12) is detachably fixed to the end of the cylindrical frame (1) by fasteners. A positioning plate (6) is detachably fixedly provided at the inner end of the cover plate (12). A positioning hole coaxial with the cylindrical frame (1) is provided on the positioning plate (6). The positioning hole and the end of the cover plate (12) form a positioning groove (61) that cooperates with one end of the workpiece (3) for positioning.

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